init_64.c 57.8 KB
Newer Older
A
Adrian Bunk 已提交
1
/*
L
Linus Torvalds 已提交
2 3 4 5 6 7
 *  arch/sparc64/mm/init.c
 *
 *  Copyright (C) 1996-1999 David S. Miller (davem@caip.rutgers.edu)
 *  Copyright (C) 1997-1999 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */
 
8
#include <linux/module.h>
L
Linus Torvalds 已提交
9 10 11 12 13 14 15 16 17 18 19
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/slab.h>
#include <linux/initrd.h>
#include <linux/swap.h>
#include <linux/pagemap.h>
20
#include <linux/poison.h>
L
Linus Torvalds 已提交
21 22
#include <linux/fs.h>
#include <linux/seq_file.h>
23
#include <linux/kprobes.h>
24
#include <linux/cache.h>
25
#include <linux/sort.h>
26
#include <linux/percpu.h>
27
#include <linux/lmb.h>
D
David S. Miller 已提交
28
#include <linux/mmzone.h>
L
Linus Torvalds 已提交
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

#include <asm/head.h>
#include <asm/system.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/pgtable.h>
#include <asm/oplib.h>
#include <asm/iommu.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include <asm/dma.h>
#include <asm/starfire.h>
#include <asm/tlb.h>
#include <asm/spitfire.h>
#include <asm/sections.h>
46
#include <asm/tsb.h>
47
#include <asm/hypervisor.h>
48
#include <asm/prom.h>
49
#include <asm/mdesc.h>
50
#include <asm/cpudata.h>
D
David S. Miller 已提交
51
#include <asm/irq.h>
L
Linus Torvalds 已提交
52

S
Sam Ravnborg 已提交
53
#include "init_64.h"
54 55 56 57 58 59 60 61 62

unsigned long kern_linear_pte_xor[2] __read_mostly;

/* A bitmap, one bit for every 256MB of physical memory.  If the bit
 * is clear, we should use a 4MB page (via kern_linear_pte_xor[0]) else
 * if set we should use a 256MB page (via kern_linear_pte_xor[1]).
 */
unsigned long kpte_linear_bitmap[KPTE_BITMAP_BYTES / sizeof(unsigned long)];

63
#ifndef CONFIG_DEBUG_PAGEALLOC
64 65 66 67 68
/* A special kernel TSB for 4MB and 256MB linear mappings.
 * Space is allocated for this right after the trap table
 * in arch/sparc64/kernel/head.S
 */
extern struct tsb swapper_4m_tsb[KERNEL_TSB4M_NENTRIES];
69
#endif
70

71 72
#define MAX_BANKS	32

73 74
static struct linux_prom64_registers pavail[MAX_BANKS] __devinitdata;
static int pavail_ents __devinitdata;
75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116

static int cmp_p64(const void *a, const void *b)
{
	const struct linux_prom64_registers *x = a, *y = b;

	if (x->phys_addr > y->phys_addr)
		return 1;
	if (x->phys_addr < y->phys_addr)
		return -1;
	return 0;
}

static void __init read_obp_memory(const char *property,
				   struct linux_prom64_registers *regs,
				   int *num_ents)
{
	int node = prom_finddevice("/memory");
	int prop_size = prom_getproplen(node, property);
	int ents, ret, i;

	ents = prop_size / sizeof(struct linux_prom64_registers);
	if (ents > MAX_BANKS) {
		prom_printf("The machine has more %s property entries than "
			    "this kernel can support (%d).\n",
			    property, MAX_BANKS);
		prom_halt();
	}

	ret = prom_getproperty(node, property, (char *) regs, prop_size);
	if (ret == -1) {
		prom_printf("Couldn't get %s property from /memory.\n");
		prom_halt();
	}

	/* Sanitize what we got from the firmware, by page aligning
	 * everything.
	 */
	for (i = 0; i < ents; i++) {
		unsigned long base, size;

		base = regs[i].phys_addr;
		size = regs[i].reg_size;
117

118 119 120 121 122 123 124 125 126
		size &= PAGE_MASK;
		if (base & ~PAGE_MASK) {
			unsigned long new_base = PAGE_ALIGN(base);

			size -= new_base - base;
			if ((long) size < 0L)
				size = 0UL;
			base = new_base;
		}
127 128 129 130 131 132 133
		if (size == 0UL) {
			/* If it is empty, simply get rid of it.
			 * This simplifies the logic of the other
			 * functions that process these arrays.
			 */
			memmove(&regs[i], &regs[i + 1],
				(ents - i - 1) * sizeof(regs[0]));
134
			i--;
135 136
			ents--;
			continue;
137
		}
138 139
		regs[i].phys_addr = base;
		regs[i].reg_size = size;
140 141 142 143
	}

	*num_ents = ents;

144
	sort(regs, ents, sizeof(struct linux_prom64_registers),
145 146
	     cmp_p64, NULL);
}
L
Linus Torvalds 已提交
147

148 149
unsigned long sparc64_valid_addr_bitmap[VALID_ADDR_BITMAP_BYTES /
					sizeof(unsigned long)];
150
EXPORT_SYMBOL(sparc64_valid_addr_bitmap);
L
Linus Torvalds 已提交
151

152
/* Kernel physical address base and size in bytes.  */
153 154
unsigned long kern_base __read_mostly;
unsigned long kern_size __read_mostly;
L
Linus Torvalds 已提交
155 156 157 158 159 160

/* Initial ramdisk setup */
extern unsigned long sparc_ramdisk_image64;
extern unsigned int sparc_ramdisk_image;
extern unsigned int sparc_ramdisk_size;

161
struct page *mem_map_zero __read_mostly;
162
EXPORT_SYMBOL(mem_map_zero);
L
Linus Torvalds 已提交
163

164 165 166 167 168 169
unsigned int sparc64_highest_unlocked_tlb_ent __read_mostly;

unsigned long sparc64_kern_pri_context __read_mostly;
unsigned long sparc64_kern_pri_nuc_bits __read_mostly;
unsigned long sparc64_kern_sec_context __read_mostly;

170
int num_kernel_image_mappings;
L
Linus Torvalds 已提交
171 172 173 174 175 176 177 178

#ifdef CONFIG_DEBUG_DCFLUSH
atomic_t dcpage_flushes = ATOMIC_INIT(0);
#ifdef CONFIG_SMP
atomic_t dcpage_flushes_xcall = ATOMIC_INIT(0);
#endif
#endif

179
inline void flush_dcache_page_impl(struct page *page)
L
Linus Torvalds 已提交
180
{
181
	BUG_ON(tlb_type == hypervisor);
L
Linus Torvalds 已提交
182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
#ifdef CONFIG_DEBUG_DCFLUSH
	atomic_inc(&dcpage_flushes);
#endif

#ifdef DCACHE_ALIASING_POSSIBLE
	__flush_dcache_page(page_address(page),
			    ((tlb_type == spitfire) &&
			     page_mapping(page) != NULL));
#else
	if (page_mapping(page) != NULL &&
	    tlb_type == spitfire)
		__flush_icache_page(__pa(page_address(page)));
#endif
}

#define PG_dcache_dirty		PG_arch_1
198 199 200
#define PG_dcache_cpu_shift	32UL
#define PG_dcache_cpu_mask	\
	((1UL<<ilog2(roundup_pow_of_two(NR_CPUS)))-1UL)
L
Linus Torvalds 已提交
201 202

#define dcache_dirty_cpu(page) \
203
	(((page)->flags >> PG_dcache_cpu_shift) & PG_dcache_cpu_mask)
L
Linus Torvalds 已提交
204

D
David S. Miller 已提交
205
static inline void set_dcache_dirty(struct page *page, int this_cpu)
L
Linus Torvalds 已提交
206 207
{
	unsigned long mask = this_cpu;
208 209 210 211 212
	unsigned long non_cpu_bits;

	non_cpu_bits = ~(PG_dcache_cpu_mask << PG_dcache_cpu_shift);
	mask = (mask << PG_dcache_cpu_shift) | (1UL << PG_dcache_dirty);

L
Linus Torvalds 已提交
213 214 215 216 217 218 219
	__asm__ __volatile__("1:\n\t"
			     "ldx	[%2], %%g7\n\t"
			     "and	%%g7, %1, %%g1\n\t"
			     "or	%%g1, %0, %%g1\n\t"
			     "casx	[%2], %%g7, %%g1\n\t"
			     "cmp	%%g7, %%g1\n\t"
			     "bne,pn	%%xcc, 1b\n\t"
220
			     " nop"
L
Linus Torvalds 已提交
221 222 223 224 225
			     : /* no outputs */
			     : "r" (mask), "r" (non_cpu_bits), "r" (&page->flags)
			     : "g1", "g7");
}

D
David S. Miller 已提交
226
static inline void clear_dcache_dirty_cpu(struct page *page, unsigned long cpu)
L
Linus Torvalds 已提交
227 228 229 230 231 232
{
	unsigned long mask = (1UL << PG_dcache_dirty);

	__asm__ __volatile__("! test_and_clear_dcache_dirty\n"
			     "1:\n\t"
			     "ldx	[%2], %%g7\n\t"
233
			     "srlx	%%g7, %4, %%g1\n\t"
L
Linus Torvalds 已提交
234 235 236 237 238 239 240
			     "and	%%g1, %3, %%g1\n\t"
			     "cmp	%%g1, %0\n\t"
			     "bne,pn	%%icc, 2f\n\t"
			     " andn	%%g7, %1, %%g1\n\t"
			     "casx	[%2], %%g7, %%g1\n\t"
			     "cmp	%%g7, %%g1\n\t"
			     "bne,pn	%%xcc, 1b\n\t"
241
			     " nop\n"
L
Linus Torvalds 已提交
242 243 244
			     "2:"
			     : /* no outputs */
			     : "r" (cpu), "r" (mask), "r" (&page->flags),
245 246
			       "i" (PG_dcache_cpu_mask),
			       "i" (PG_dcache_cpu_shift)
L
Linus Torvalds 已提交
247 248 249
			     : "g1", "g7");
}

250 251 252 253
static inline void tsb_insert(struct tsb *ent, unsigned long tag, unsigned long pte)
{
	unsigned long tsb_addr = (unsigned long) ent;

254
	if (tlb_type == cheetah_plus || tlb_type == hypervisor)
255 256 257 258 259
		tsb_addr = __pa(tsb_addr);

	__tsb_insert(tsb_addr, tag, pte);
}

260 261 262
unsigned long _PAGE_ALL_SZ_BITS __read_mostly;
unsigned long _PAGE_SZBITS __read_mostly;

263
static void flush_dcache(unsigned long pfn)
L
Linus Torvalds 已提交
264
{
265
	struct page *page;
266

267
	page = pfn_to_page(pfn);
268
	if (page) {
269 270
		unsigned long pg_flags;

271 272
		pg_flags = page->flags;
		if (pg_flags & (1UL << PG_dcache_dirty)) {
273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288
			int cpu = ((pg_flags >> PG_dcache_cpu_shift) &
				   PG_dcache_cpu_mask);
			int this_cpu = get_cpu();

			/* This is just to optimize away some function calls
			 * in the SMP case.
			 */
			if (cpu == this_cpu)
				flush_dcache_page_impl(page);
			else
				smp_flush_dcache_page_impl(page, cpu);

			clear_dcache_dirty_cpu(page, cpu);

			put_cpu();
		}
L
Linus Torvalds 已提交
289
	}
290 291
}

292
void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep)
293 294 295 296 297
{
	struct mm_struct *mm;
	struct tsb *tsb;
	unsigned long tag, flags;
	unsigned long tsb_index, tsb_hash_shift;
298
	pte_t pte = *ptep;
299 300 301 302 303 304 305

	if (tlb_type != hypervisor) {
		unsigned long pfn = pte_pfn(pte);

		if (pfn_valid(pfn))
			flush_dcache(pfn);
	}
306 307

	mm = vma->vm_mm;
308

309 310 311
	tsb_index = MM_TSB_BASE;
	tsb_hash_shift = PAGE_SHIFT;

312 313
	spin_lock_irqsave(&mm->context.lock, flags);

314 315 316 317 318 319 320 321 322 323 324 325 326 327 328
#ifdef CONFIG_HUGETLB_PAGE
	if (mm->context.tsb_block[MM_TSB_HUGE].tsb != NULL) {
		if ((tlb_type == hypervisor &&
		     (pte_val(pte) & _PAGE_SZALL_4V) == _PAGE_SZHUGE_4V) ||
		    (tlb_type != hypervisor &&
		     (pte_val(pte) & _PAGE_SZALL_4U) == _PAGE_SZHUGE_4U)) {
			tsb_index = MM_TSB_HUGE;
			tsb_hash_shift = HPAGE_SHIFT;
		}
	}
#endif

	tsb = mm->context.tsb_block[tsb_index].tsb;
	tsb += ((address >> tsb_hash_shift) &
		(mm->context.tsb_block[tsb_index].tsb_nentries - 1UL));
329 330
	tag = (address >> 22UL);
	tsb_insert(tsb, tag, pte_val(pte));
331 332

	spin_unlock_irqrestore(&mm->context.lock, flags);
L
Linus Torvalds 已提交
333 334 335 336
}

void flush_dcache_page(struct page *page)
{
337 338
	struct address_space *mapping;
	int this_cpu;
L
Linus Torvalds 已提交
339

340 341 342
	if (tlb_type == hypervisor)
		return;

343 344 345 346 347 348 349 350 351 352
	/* Do not bother with the expensive D-cache flush if it
	 * is merely the zero page.  The 'bigcore' testcase in GDB
	 * causes this case to run millions of times.
	 */
	if (page == ZERO_PAGE(0))
		return;

	this_cpu = get_cpu();

	mapping = page_mapping(page);
L
Linus Torvalds 已提交
353
	if (mapping && !mapping_mapped(mapping)) {
354
		int dirty = test_bit(PG_dcache_dirty, &page->flags);
L
Linus Torvalds 已提交
355
		if (dirty) {
356 357
			int dirty_cpu = dcache_dirty_cpu(page);

L
Linus Torvalds 已提交
358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374
			if (dirty_cpu == this_cpu)
				goto out;
			smp_flush_dcache_page_impl(page, dirty_cpu);
		}
		set_dcache_dirty(page, this_cpu);
	} else {
		/* We could delay the flush for the !page_mapping
		 * case too.  But that case is for exec env/arg
		 * pages and those are %99 certainly going to get
		 * faulted into the tlb (and thus flushed) anyways.
		 */
		flush_dcache_page_impl(page);
	}

out:
	put_cpu();
}
375
EXPORT_SYMBOL(flush_dcache_page);
L
Linus Torvalds 已提交
376

377
void __kprobes flush_icache_range(unsigned long start, unsigned long end)
L
Linus Torvalds 已提交
378
{
379
	/* Cheetah and Hypervisor platform cpus have coherent I-cache. */
L
Linus Torvalds 已提交
380 381 382
	if (tlb_type == spitfire) {
		unsigned long kaddr;

383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400
		/* This code only runs on Spitfire cpus so this is
		 * why we can assume _PAGE_PADDR_4U.
		 */
		for (kaddr = start; kaddr < end; kaddr += PAGE_SIZE) {
			unsigned long paddr, mask = _PAGE_PADDR_4U;

			if (kaddr >= PAGE_OFFSET)
				paddr = kaddr & mask;
			else {
				pgd_t *pgdp = pgd_offset_k(kaddr);
				pud_t *pudp = pud_offset(pgdp, kaddr);
				pmd_t *pmdp = pmd_offset(pudp, kaddr);
				pte_t *ptep = pte_offset_kernel(pmdp, kaddr);

				paddr = pte_val(*ptep) & mask;
			}
			__flush_icache_page(paddr);
		}
L
Linus Torvalds 已提交
401 402
	}
}
403
EXPORT_SYMBOL(flush_icache_range);
L
Linus Torvalds 已提交
404 405 406 407 408 409 410 411 412

void mmu_info(struct seq_file *m)
{
	if (tlb_type == cheetah)
		seq_printf(m, "MMU Type\t: Cheetah\n");
	else if (tlb_type == cheetah_plus)
		seq_printf(m, "MMU Type\t: Cheetah+\n");
	else if (tlb_type == spitfire)
		seq_printf(m, "MMU Type\t: Spitfire\n");
413 414
	else if (tlb_type == hypervisor)
		seq_printf(m, "MMU Type\t: Hypervisor (sun4v)\n");
L
Linus Torvalds 已提交
415 416 417 418 419 420 421 422 423 424 425 426 427
	else
		seq_printf(m, "MMU Type\t: ???\n");

#ifdef CONFIG_DEBUG_DCFLUSH
	seq_printf(m, "DCPageFlushes\t: %d\n",
		   atomic_read(&dcpage_flushes));
#ifdef CONFIG_SMP
	seq_printf(m, "DCPageFlushesXC\t: %d\n",
		   atomic_read(&dcpage_flushes_xcall));
#endif /* CONFIG_SMP */
#endif /* CONFIG_DEBUG_DCFLUSH */
}

428 429 430
struct linux_prom_translation prom_trans[512] __read_mostly;
unsigned int prom_trans_ents __read_mostly;

L
Linus Torvalds 已提交
431 432
unsigned long kern_locked_tte_data;

433 434
/* The obp translations are saved based on 8k pagesize, since obp can
 * use a mixture of pagesizes. Misses to the LOW_OBP_ADDRESS ->
435
 * HI_OBP_ADDRESS range are handled in ktlb.S.
436
 */
437 438 439 440 441 442
static inline int in_obp_range(unsigned long vaddr)
{
	return (vaddr >= LOW_OBP_ADDRESS &&
		vaddr < HI_OBP_ADDRESS);
}

443
static int cmp_ptrans(const void *a, const void *b)
444
{
445
	const struct linux_prom_translation *x = a, *y = b;
446

447 448 449 450 451
	if (x->virt > y->virt)
		return 1;
	if (x->virt < y->virt)
		return -1;
	return 0;
452 453
}

454
/* Read OBP translations property into 'prom_trans[]'.  */
455
static void __init read_obp_translations(void)
456
{
457
	int n, node, ents, first, last, i;
L
Linus Torvalds 已提交
458 459 460

	node = prom_finddevice("/virtual-memory");
	n = prom_getproplen(node, "translations");
461
	if (unlikely(n == 0 || n == -1)) {
462
		prom_printf("prom_mappings: Couldn't get size.\n");
L
Linus Torvalds 已提交
463 464
		prom_halt();
	}
465 466
	if (unlikely(n > sizeof(prom_trans))) {
		prom_printf("prom_mappings: Size %Zd is too big.\n", n);
L
Linus Torvalds 已提交
467 468
		prom_halt();
	}
469

470
	if ((n = prom_getproperty(node, "translations",
471 472
				  (char *)&prom_trans[0],
				  sizeof(prom_trans))) == -1) {
473
		prom_printf("prom_mappings: Couldn't get property.\n");
L
Linus Torvalds 已提交
474 475
		prom_halt();
	}
476

477
	n = n / sizeof(struct linux_prom_translation);
478

479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513
	ents = n;

	sort(prom_trans, ents, sizeof(struct linux_prom_translation),
	     cmp_ptrans, NULL);

	/* Now kick out all the non-OBP entries.  */
	for (i = 0; i < ents; i++) {
		if (in_obp_range(prom_trans[i].virt))
			break;
	}
	first = i;
	for (; i < ents; i++) {
		if (!in_obp_range(prom_trans[i].virt))
			break;
	}
	last = i;

	for (i = 0; i < (last - first); i++) {
		struct linux_prom_translation *src = &prom_trans[i + first];
		struct linux_prom_translation *dest = &prom_trans[i];

		*dest = *src;
	}
	for (; i < ents; i++) {
		struct linux_prom_translation *dest = &prom_trans[i];
		dest->virt = dest->size = dest->data = 0x0UL;
	}

	prom_trans_ents = last - first;

	if (tlb_type == spitfire) {
		/* Clear diag TTE bits. */
		for (i = 0; i < prom_trans_ents; i++)
			prom_trans[i].data &= ~0x0003fe0000000000UL;
	}
514
}
L
Linus Torvalds 已提交
515

516 517 518 519
static void __init hypervisor_tlb_lock(unsigned long vaddr,
				       unsigned long pte,
				       unsigned long mmu)
{
520 521 522
	unsigned long ret = sun4v_mmu_map_perm_addr(vaddr, 0, pte, mmu);

	if (ret != 0) {
523
		prom_printf("hypervisor_tlb_lock[%lx:%lx:%lx:%lx]: "
524
			    "errors with %lx\n", vaddr, 0, pte, mmu, ret);
525 526
		prom_halt();
	}
527 528
}

529 530
static unsigned long kern_large_tte(unsigned long paddr);

531
static void __init remap_kernel(void)
532 533
{
	unsigned long phys_page, tte_vaddr, tte_data;
534
	int i, tlb_ent = sparc64_highest_locked_tlbent();
535

L
Linus Torvalds 已提交
536
	tte_vaddr = (unsigned long) KERNBASE;
537
	phys_page = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
538
	tte_data = kern_large_tte(phys_page);
L
Linus Torvalds 已提交
539 540 541

	kern_locked_tte_data = tte_data;

542 543
	/* Now lock us into the TLBs via Hypervisor or OBP. */
	if (tlb_type == hypervisor) {
544
		for (i = 0; i < num_kernel_image_mappings; i++) {
545 546
			hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_DMMU);
			hypervisor_tlb_lock(tte_vaddr, tte_data, HV_MMU_IMMU);
547 548
			tte_vaddr += 0x400000;
			tte_data += 0x400000;
549 550
		}
	} else {
551 552 553 554 555
		for (i = 0; i < num_kernel_image_mappings; i++) {
			prom_dtlb_load(tlb_ent - i, tte_data, tte_vaddr);
			prom_itlb_load(tlb_ent - i, tte_data, tte_vaddr);
			tte_vaddr += 0x400000;
			tte_data += 0x400000;
556
		}
557
		sparc64_highest_unlocked_tlb_ent = tlb_ent - i;
L
Linus Torvalds 已提交
558
	}
559 560 561 562 563 564
	if (tlb_type == cheetah_plus) {
		sparc64_kern_pri_context = (CTX_CHEETAH_PLUS_CTX0 |
					    CTX_CHEETAH_PLUS_NUC);
		sparc64_kern_pri_nuc_bits = CTX_CHEETAH_PLUS_NUC;
		sparc64_kern_sec_context = CTX_CHEETAH_PLUS_CTX0;
	}
565
}
L
Linus Torvalds 已提交
566

567

568
static void __init inherit_prom_mappings(void)
569
{
570
	/* Now fixup OBP's idea about where we really are mapped. */
571
	printk("Remapping the kernel... ");
572
	remap_kernel();
573
	printk("done.\n");
L
Linus Torvalds 已提交
574 575 576 577 578 579 580
}

void prom_world(int enter)
{
	if (!enter)
		set_fs((mm_segment_t) { get_thread_current_ds() });

581
	__asm__ __volatile__("flushw");
L
Linus Torvalds 已提交
582 583 584 585 586 587 588 589 590 591 592 593 594 595
}

void __flush_dcache_range(unsigned long start, unsigned long end)
{
	unsigned long va;

	if (tlb_type == spitfire) {
		int n = 0;

		for (va = start; va < end; va += 32) {
			spitfire_put_dcache_tag(va & 0x3fe0, 0x0);
			if (++n >= 512)
				break;
		}
596
	} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
L
Linus Torvalds 已提交
597 598 599 600 601 602 603 604 605 606
		start = __pa(start);
		end = __pa(end);
		for (va = start; va < end; va += 32)
			__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
					     "membar #Sync"
					     : /* no outputs */
					     : "r" (va),
					       "i" (ASI_DCACHE_INVALIDATE));
	}
}
607
EXPORT_SYMBOL(__flush_dcache_range);
L
Linus Torvalds 已提交
608

609 610 611 612 613 614 615
/* get_new_mmu_context() uses "cache + 1".  */
DEFINE_SPINLOCK(ctx_alloc_lock);
unsigned long tlb_context_cache = CTX_FIRST_VERSION - 1;
#define MAX_CTX_NR	(1UL << CTX_NR_BITS)
#define CTX_BMAP_SLOTS	BITS_TO_LONGS(MAX_CTX_NR)
DECLARE_BITMAP(mmu_context_bmap, MAX_CTX_NR);

L
Linus Torvalds 已提交
616 617 618 619 620 621 622
/* Caller does TLB context flushing on local CPU if necessary.
 * The caller also ensures that CTX_VALID(mm->context) is false.
 *
 * We must be careful about boundary cases so that we never
 * let the user have CTX 0 (nucleus) or we ever use a CTX
 * version of zero (and thus NO_CONTEXT would not be caught
 * by version mis-match tests in mmu_context.h).
623 624
 *
 * Always invoked with interrupts disabled.
L
Linus Torvalds 已提交
625 626 627 628 629
 */
void get_new_mmu_context(struct mm_struct *mm)
{
	unsigned long ctx, new_ctx;
	unsigned long orig_pgsz_bits;
630
	unsigned long flags;
631
	int new_version;
L
Linus Torvalds 已提交
632

633
	spin_lock_irqsave(&ctx_alloc_lock, flags);
L
Linus Torvalds 已提交
634 635 636
	orig_pgsz_bits = (mm->context.sparc64_ctx_val & CTX_PGSZ_MASK);
	ctx = (tlb_context_cache + 1) & CTX_NR_MASK;
	new_ctx = find_next_zero_bit(mmu_context_bmap, 1 << CTX_NR_BITS, ctx);
637
	new_version = 0;
L
Linus Torvalds 已提交
638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659
	if (new_ctx >= (1 << CTX_NR_BITS)) {
		new_ctx = find_next_zero_bit(mmu_context_bmap, ctx, 1);
		if (new_ctx >= ctx) {
			int i;
			new_ctx = (tlb_context_cache & CTX_VERSION_MASK) +
				CTX_FIRST_VERSION;
			if (new_ctx == 1)
				new_ctx = CTX_FIRST_VERSION;

			/* Don't call memset, for 16 entries that's just
			 * plain silly...
			 */
			mmu_context_bmap[0] = 3;
			mmu_context_bmap[1] = 0;
			mmu_context_bmap[2] = 0;
			mmu_context_bmap[3] = 0;
			for (i = 4; i < CTX_BMAP_SLOTS; i += 4) {
				mmu_context_bmap[i + 0] = 0;
				mmu_context_bmap[i + 1] = 0;
				mmu_context_bmap[i + 2] = 0;
				mmu_context_bmap[i + 3] = 0;
			}
660
			new_version = 1;
L
Linus Torvalds 已提交
661 662 663 664 665 666 667 668
			goto out;
		}
	}
	mmu_context_bmap[new_ctx>>6] |= (1UL << (new_ctx & 63));
	new_ctx |= (tlb_context_cache & CTX_VERSION_MASK);
out:
	tlb_context_cache = new_ctx;
	mm->context.sparc64_ctx_val = new_ctx | orig_pgsz_bits;
669
	spin_unlock_irqrestore(&ctx_alloc_lock, flags);
670 671 672

	if (unlikely(new_version))
		smp_new_mmu_context_version();
L
Linus Torvalds 已提交
673 674
}

D
David S. Miller 已提交
675 676 677 678
static int numa_enabled = 1;
static int numa_debug;

static int __init early_numa(char *p)
L
Linus Torvalds 已提交
679
{
D
David S. Miller 已提交
680 681 682 683 684
	if (!p)
		return 0;

	if (strstr(p, "off"))
		numa_enabled = 0;
685

D
David S. Miller 已提交
686 687
	if (strstr(p, "debug"))
		numa_debug = 1;
688

D
David S. Miller 已提交
689
	return 0;
690
}
D
David S. Miller 已提交
691 692 693 694 695 696
early_param("numa", early_numa);

#define numadbg(f, a...) \
do {	if (numa_debug) \
		printk(KERN_INFO f, ## a); \
} while (0)
697

698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722
static void __init find_ramdisk(unsigned long phys_base)
{
#ifdef CONFIG_BLK_DEV_INITRD
	if (sparc_ramdisk_image || sparc_ramdisk_image64) {
		unsigned long ramdisk_image;

		/* Older versions of the bootloader only supported a
		 * 32-bit physical address for the ramdisk image
		 * location, stored at sparc_ramdisk_image.  Newer
		 * SILO versions set sparc_ramdisk_image to zero and
		 * provide a full 64-bit physical address at
		 * sparc_ramdisk_image64.
		 */
		ramdisk_image = sparc_ramdisk_image;
		if (!ramdisk_image)
			ramdisk_image = sparc_ramdisk_image64;

		/* Another bootloader quirk.  The bootloader normalizes
		 * the physical address to KERNBASE, so we have to
		 * factor that back out and add in the lowest valid
		 * physical page address to get the true physical address.
		 */
		ramdisk_image -= KERNBASE;
		ramdisk_image += phys_base;

D
David S. Miller 已提交
723 724 725
		numadbg("Found ramdisk at physical address 0x%lx, size %u\n",
			ramdisk_image, sparc_ramdisk_size);

726 727
		initrd_start = ramdisk_image;
		initrd_end = ramdisk_image + sparc_ramdisk_size;
728

729
		lmb_reserve(initrd_start, sparc_ramdisk_size);
730 731 732

		initrd_start += PAGE_OFFSET;
		initrd_end += PAGE_OFFSET;
733 734 735 736
	}
#endif
}

D
David S. Miller 已提交
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787
struct node_mem_mask {
	unsigned long mask;
	unsigned long val;
	unsigned long bootmem_paddr;
};
static struct node_mem_mask node_masks[MAX_NUMNODES];
static int num_node_masks;

int numa_cpu_lookup_table[NR_CPUS];
cpumask_t numa_cpumask_lookup_table[MAX_NUMNODES];

#ifdef CONFIG_NEED_MULTIPLE_NODES

struct mdesc_mblock {
	u64	base;
	u64	size;
	u64	offset; /* RA-to-PA */
};
static struct mdesc_mblock *mblocks;
static int num_mblocks;

static unsigned long ra_to_pa(unsigned long addr)
{
	int i;

	for (i = 0; i < num_mblocks; i++) {
		struct mdesc_mblock *m = &mblocks[i];

		if (addr >= m->base &&
		    addr < (m->base + m->size)) {
			addr += m->offset;
			break;
		}
	}
	return addr;
}

static int find_node(unsigned long addr)
{
	int i;

	addr = ra_to_pa(addr);
	for (i = 0; i < num_node_masks; i++) {
		struct node_mem_mask *p = &node_masks[i];

		if ((addr & p->mask) == p->val)
			return i;
	}
	return -1;
}

788 789
static unsigned long long nid_range(unsigned long long start,
				    unsigned long long end, int *nid)
D
David S. Miller 已提交
790 791 792 793 794 795 796 797 798 799 800
{
	*nid = find_node(start);
	start += PAGE_SIZE;
	while (start < end) {
		int n = find_node(start);

		if (n != *nid)
			break;
		start += PAGE_SIZE;
	}

801 802 803
	if (start > end)
		start = end;

D
David S. Miller 已提交
804 805 806
	return start;
}
#else
807 808
static unsigned long long nid_range(unsigned long long start,
				    unsigned long long end, int *nid)
D
David S. Miller 已提交
809 810 811 812 813 814 815 816 817
{
	*nid = 0;
	return end;
}
#endif

/* This must be invoked after performing all of the necessary
 * add_active_range() calls for 'nid'.  We need to be able to get
 * correct data from get_pfn_range_for_nid().
818
 */
D
David S. Miller 已提交
819 820 821 822 823 824 825 826 827 828 829 830 831 832 833
static void __init allocate_node_data(int nid)
{
	unsigned long paddr, num_pages, start_pfn, end_pfn;
	struct pglist_data *p;

#ifdef CONFIG_NEED_MULTIPLE_NODES
	paddr = lmb_alloc_nid(sizeof(struct pglist_data),
			      SMP_CACHE_BYTES, nid, nid_range);
	if (!paddr) {
		prom_printf("Cannot allocate pglist_data for nid[%d]\n", nid);
		prom_halt();
	}
	NODE_DATA(nid) = __va(paddr);
	memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));

834
	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
D
David S. Miller 已提交
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
#endif

	p = NODE_DATA(nid);

	get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
	p->node_start_pfn = start_pfn;
	p->node_spanned_pages = end_pfn - start_pfn;

	if (p->node_spanned_pages) {
		num_pages = bootmem_bootmap_pages(p->node_spanned_pages);

		paddr = lmb_alloc_nid(num_pages << PAGE_SHIFT, PAGE_SIZE, nid,
				      nid_range);
		if (!paddr) {
			prom_printf("Cannot allocate bootmap for nid[%d]\n",
				  nid);
			prom_halt();
		}
		node_masks[nid].bootmem_paddr = paddr;
	}
}

static void init_node_masks_nonnuma(void)
858
{
L
Linus Torvalds 已提交
859 860
	int i;

D
David S. Miller 已提交
861
	numadbg("Initializing tables for non-numa.\n");
862

D
David S. Miller 已提交
863 864
	node_masks[0].mask = node_masks[0].val = 0;
	num_node_masks = 1;
865

D
David S. Miller 已提交
866 867
	for (i = 0; i < NR_CPUS; i++)
		numa_cpu_lookup_table[i] = 0;
L
Linus Torvalds 已提交
868

D
David S. Miller 已提交
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
	numa_cpumask_lookup_table[0] = CPU_MASK_ALL;
}

#ifdef CONFIG_NEED_MULTIPLE_NODES
struct pglist_data *node_data[MAX_NUMNODES];

EXPORT_SYMBOL(numa_cpu_lookup_table);
EXPORT_SYMBOL(numa_cpumask_lookup_table);
EXPORT_SYMBOL(node_data);

struct mdesc_mlgroup {
	u64	node;
	u64	latency;
	u64	match;
	u64	mask;
};
static struct mdesc_mlgroup *mlgroups;
static int num_mlgroups;

static int scan_pio_for_cfg_handle(struct mdesc_handle *md, u64 pio,
				   u32 cfg_handle)
{
	u64 arc;

	mdesc_for_each_arc(arc, md, pio, MDESC_ARC_TYPE_FWD) {
		u64 target = mdesc_arc_target(md, arc);
		const u64 *val;

		val = mdesc_get_property(md, target,
					 "cfg-handle", NULL);
		if (val && *val == cfg_handle)
			return 0;
	}
	return -ENODEV;
}

static int scan_arcs_for_cfg_handle(struct mdesc_handle *md, u64 grp,
				    u32 cfg_handle)
{
	u64 arc, candidate, best_latency = ~(u64)0;

	candidate = MDESC_NODE_NULL;
	mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_FWD) {
		u64 target = mdesc_arc_target(md, arc);
		const char *name = mdesc_node_name(md, target);
		const u64 *val;

		if (strcmp(name, "pio-latency-group"))
			continue;

		val = mdesc_get_property(md, target, "latency", NULL);
		if (!val)
			continue;

		if (*val < best_latency) {
			candidate = target;
			best_latency = *val;
		}
	}

	if (candidate == MDESC_NODE_NULL)
		return -ENODEV;

	return scan_pio_for_cfg_handle(md, candidate, cfg_handle);
}

int of_node_to_nid(struct device_node *dp)
{
	const struct linux_prom64_registers *regs;
	struct mdesc_handle *md;
	u32 cfg_handle;
	int count, nid;
	u64 grp;

943 944 945 946
	/* This is the right thing to do on currently supported
	 * SUN4U NUMA platforms as well, as the PCI controller does
	 * not sit behind any particular memory controller.
	 */
D
David S. Miller 已提交
947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
	if (!mlgroups)
		return -1;

	regs = of_get_property(dp, "reg", NULL);
	if (!regs)
		return -1;

	cfg_handle = (regs->phys_addr >> 32UL) & 0x0fffffff;

	md = mdesc_grab();

	count = 0;
	nid = -1;
	mdesc_for_each_node_by_name(md, grp, "group") {
		if (!scan_arcs_for_cfg_handle(md, grp, cfg_handle)) {
			nid = count;
			break;
		}
		count++;
	}

	mdesc_release(md);

	return nid;
}

973
static void __init add_node_ranges(void)
D
David S. Miller 已提交
974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034
{
	int i;

	for (i = 0; i < lmb.memory.cnt; i++) {
		unsigned long size = lmb_size_bytes(&lmb.memory, i);
		unsigned long start, end;

		start = lmb.memory.region[i].base;
		end = start + size;
		while (start < end) {
			unsigned long this_end;
			int nid;

			this_end = nid_range(start, end, &nid);

			numadbg("Adding active range nid[%d] "
				"start[%lx] end[%lx]\n",
				nid, start, this_end);

			add_active_range(nid,
					 start >> PAGE_SHIFT,
					 this_end >> PAGE_SHIFT);

			start = this_end;
		}
	}
}

static int __init grab_mlgroups(struct mdesc_handle *md)
{
	unsigned long paddr;
	int count = 0;
	u64 node;

	mdesc_for_each_node_by_name(md, node, "memory-latency-group")
		count++;
	if (!count)
		return -ENOENT;

	paddr = lmb_alloc(count * sizeof(struct mdesc_mlgroup),
			  SMP_CACHE_BYTES);
	if (!paddr)
		return -ENOMEM;

	mlgroups = __va(paddr);
	num_mlgroups = count;

	count = 0;
	mdesc_for_each_node_by_name(md, node, "memory-latency-group") {
		struct mdesc_mlgroup *m = &mlgroups[count++];
		const u64 *val;

		m->node = node;

		val = mdesc_get_property(md, node, "latency", NULL);
		m->latency = *val;
		val = mdesc_get_property(md, node, "address-match", NULL);
		m->match = *val;
		val = mdesc_get_property(md, node, "address-mask", NULL);
		m->mask = *val;

1035 1036
		numadbg("MLGROUP[%d]: node[%llx] latency[%llx] "
			"match[%llx] mask[%llx]\n",
D
David S. Miller 已提交
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
			count - 1, m->node, m->latency, m->match, m->mask);
	}

	return 0;
}

static int __init grab_mblocks(struct mdesc_handle *md)
{
	unsigned long paddr;
	int count = 0;
	u64 node;

	mdesc_for_each_node_by_name(md, node, "mblock")
		count++;
	if (!count)
		return -ENOENT;

	paddr = lmb_alloc(count * sizeof(struct mdesc_mblock),
			  SMP_CACHE_BYTES);
	if (!paddr)
		return -ENOMEM;

	mblocks = __va(paddr);
	num_mblocks = count;

	count = 0;
	mdesc_for_each_node_by_name(md, node, "mblock") {
		struct mdesc_mblock *m = &mblocks[count++];
		const u64 *val;

		val = mdesc_get_property(md, node, "base", NULL);
		m->base = *val;
		val = mdesc_get_property(md, node, "size", NULL);
		m->size = *val;
		val = mdesc_get_property(md, node,
					 "address-congruence-offset", NULL);
		m->offset = *val;

1075
		numadbg("MBLOCK[%d]: base[%llx] size[%llx] offset[%llx]\n",
D
David S. Miller 已提交
1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096
			count - 1, m->base, m->size, m->offset);
	}

	return 0;
}

static void __init numa_parse_mdesc_group_cpus(struct mdesc_handle *md,
					       u64 grp, cpumask_t *mask)
{
	u64 arc;

	cpus_clear(*mask);

	mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_BACK) {
		u64 target = mdesc_arc_target(md, arc);
		const char *name = mdesc_node_name(md, target);
		const u64 *id;

		if (strcmp(name, "cpu"))
			continue;
		id = mdesc_get_property(md, target, "id", NULL);
1097
		if (*id < nr_cpu_ids)
D
David S. Miller 已提交
1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144
			cpu_set(*id, *mask);
	}
}

static struct mdesc_mlgroup * __init find_mlgroup(u64 node)
{
	int i;

	for (i = 0; i < num_mlgroups; i++) {
		struct mdesc_mlgroup *m = &mlgroups[i];
		if (m->node == node)
			return m;
	}
	return NULL;
}

static int __init numa_attach_mlgroup(struct mdesc_handle *md, u64 grp,
				      int index)
{
	struct mdesc_mlgroup *candidate = NULL;
	u64 arc, best_latency = ~(u64)0;
	struct node_mem_mask *n;

	mdesc_for_each_arc(arc, md, grp, MDESC_ARC_TYPE_FWD) {
		u64 target = mdesc_arc_target(md, arc);
		struct mdesc_mlgroup *m = find_mlgroup(target);
		if (!m)
			continue;
		if (m->latency < best_latency) {
			candidate = m;
			best_latency = m->latency;
		}
	}
	if (!candidate)
		return -ENOENT;

	if (num_node_masks != index) {
		printk(KERN_ERR "Inconsistent NUMA state, "
		       "index[%d] != num_node_masks[%d]\n",
		       index, num_node_masks);
		return -EINVAL;
	}

	n = &node_masks[num_node_masks++];

	n->mask = candidate->mask;
	n->val = candidate->match;
L
Linus Torvalds 已提交
1145

1146
	numadbg("NUMA NODE[%d]: mask[%lx] val[%lx] (latency[%llx])\n",
D
David S. Miller 已提交
1147
		index, n->mask, n->val, candidate->latency);
L
Linus Torvalds 已提交
1148

D
David S. Miller 已提交
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214
	return 0;
}

static int __init numa_parse_mdesc_group(struct mdesc_handle *md, u64 grp,
					 int index)
{
	cpumask_t mask;
	int cpu;

	numa_parse_mdesc_group_cpus(md, grp, &mask);

	for_each_cpu_mask(cpu, mask)
		numa_cpu_lookup_table[cpu] = index;
	numa_cpumask_lookup_table[index] = mask;

	if (numa_debug) {
		printk(KERN_INFO "NUMA GROUP[%d]: cpus [ ", index);
		for_each_cpu_mask(cpu, mask)
			printk("%d ", cpu);
		printk("]\n");
	}

	return numa_attach_mlgroup(md, grp, index);
}

static int __init numa_parse_mdesc(void)
{
	struct mdesc_handle *md = mdesc_grab();
	int i, err, count;
	u64 node;

	node = mdesc_node_by_name(md, MDESC_NODE_NULL, "latency-groups");
	if (node == MDESC_NODE_NULL) {
		mdesc_release(md);
		return -ENOENT;
	}

	err = grab_mblocks(md);
	if (err < 0)
		goto out;

	err = grab_mlgroups(md);
	if (err < 0)
		goto out;

	count = 0;
	mdesc_for_each_node_by_name(md, node, "group") {
		err = numa_parse_mdesc_group(md, node, count);
		if (err < 0)
			break;
		count++;
	}

	add_node_ranges();

	for (i = 0; i < num_node_masks; i++) {
		allocate_node_data(i);
		node_set_online(i);
	}

	err = 0;
out:
	mdesc_release(md);
	return err;
}

1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
static int __init numa_parse_jbus(void)
{
	unsigned long cpu, index;

	/* NUMA node id is encoded in bits 36 and higher, and there is
	 * a 1-to-1 mapping from CPU ID to NUMA node ID.
	 */
	index = 0;
	for_each_present_cpu(cpu) {
		numa_cpu_lookup_table[cpu] = index;
		numa_cpumask_lookup_table[index] = cpumask_of_cpu(cpu);
		node_masks[index].mask = ~((1UL << 36UL) - 1UL);
		node_masks[index].val = cpu << 36UL;

		index++;
	}
	num_node_masks = index;

	add_node_ranges();

	for (index = 0; index < num_node_masks; index++) {
		allocate_node_data(index);
		node_set_online(index);
	}

	return 0;
}

D
David S. Miller 已提交
1243 1244
static int __init numa_parse_sun4u(void)
{
1245 1246 1247 1248 1249 1250 1251 1252
	if (tlb_type == cheetah || tlb_type == cheetah_plus) {
		unsigned long ver;

		__asm__ ("rdpr %%ver, %0" : "=r" (ver));
		if ((ver >> 32UL) == __JALAPENO_ID ||
		    (ver >> 32UL) == __SERRANO_ID)
			return numa_parse_jbus();
	}
D
David S. Miller 已提交
1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271
	return -1;
}

static int __init bootmem_init_numa(void)
{
	int err = -1;

	numadbg("bootmem_init_numa()\n");

	if (numa_enabled) {
		if (tlb_type == hypervisor)
			err = numa_parse_mdesc();
		else
			err = numa_parse_sun4u();
	}
	return err;
}

#else
L
Linus Torvalds 已提交
1272

D
David S. Miller 已提交
1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
static int bootmem_init_numa(void)
{
	return -1;
}

#endif

static void __init bootmem_init_nonnuma(void)
{
	unsigned long top_of_ram = lmb_end_of_DRAM();
	unsigned long total_ram = lmb_phys_mem_size();
	unsigned int i;

	numadbg("bootmem_init_nonnuma()\n");

	printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
	       top_of_ram, total_ram);
	printk(KERN_INFO "Memory hole size: %ldMB\n",
	       (top_of_ram - total_ram) >> 20);

	init_node_masks_nonnuma();

	for (i = 0; i < lmb.memory.cnt; i++) {
		unsigned long size = lmb_size_bytes(&lmb.memory, i);
		unsigned long start_pfn, end_pfn;

		if (!size)
			continue;
L
Linus Torvalds 已提交
1301

1302
		start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT;
D
David S. Miller 已提交
1303 1304 1305
		end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i);
		add_active_range(0, start_pfn, end_pfn);
	}
1306

D
David S. Miller 已提交
1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
	allocate_node_data(0);

	node_set_online(0);
}

static void __init reserve_range_in_node(int nid, unsigned long start,
					 unsigned long end)
{
	numadbg("    reserve_range_in_node(nid[%d],start[%lx],end[%lx]\n",
		nid, start, end);
	while (start < end) {
		unsigned long this_end;
		int n;

		this_end = nid_range(start, end, &n);
		if (n == nid) {
			numadbg("      MATCH reserving range [%lx:%lx]\n",
				start, this_end);
			reserve_bootmem_node(NODE_DATA(nid), start,
					     (this_end - start), BOOTMEM_DEFAULT);
		} else
			numadbg("      NO MATCH, advancing start to %lx\n",
				this_end);

		start = this_end;
1332
	}
D
David S. Miller 已提交
1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397
}

static void __init trim_reserved_in_node(int nid)
{
	int i;

	numadbg("  trim_reserved_in_node(%d)\n", nid);

	for (i = 0; i < lmb.reserved.cnt; i++) {
		unsigned long start = lmb.reserved.region[i].base;
		unsigned long size = lmb_size_bytes(&lmb.reserved, i);
		unsigned long end = start + size;

		reserve_range_in_node(nid, start, end);
	}
}

static void __init bootmem_init_one_node(int nid)
{
	struct pglist_data *p;

	numadbg("bootmem_init_one_node(%d)\n", nid);

	p = NODE_DATA(nid);

	if (p->node_spanned_pages) {
		unsigned long paddr = node_masks[nid].bootmem_paddr;
		unsigned long end_pfn;

		end_pfn = p->node_start_pfn + p->node_spanned_pages;

		numadbg("  init_bootmem_node(%d, %lx, %lx, %lx)\n",
			nid, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);

		init_bootmem_node(p, paddr >> PAGE_SHIFT,
				  p->node_start_pfn, end_pfn);

		numadbg("  free_bootmem_with_active_regions(%d, %lx)\n",
			nid, end_pfn);
		free_bootmem_with_active_regions(nid, end_pfn);

		trim_reserved_in_node(nid);

		numadbg("  sparse_memory_present_with_active_regions(%d)\n",
			nid);
		sparse_memory_present_with_active_regions(nid);
	}
}

static unsigned long __init bootmem_init(unsigned long phys_base)
{
	unsigned long end_pfn;
	int nid;

	end_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT;
	max_pfn = max_low_pfn = end_pfn;
	min_low_pfn = (phys_base >> PAGE_SHIFT);

	if (bootmem_init_numa() < 0)
		bootmem_init_nonnuma();

	/* XXX cpu notifier XXX */

	for_each_online_node(nid)
		bootmem_init_one_node(nid);
1398 1399 1400

	sparse_init();

L
Linus Torvalds 已提交
1401 1402 1403
	return end_pfn;
}

1404 1405 1406
static struct linux_prom64_registers pall[MAX_BANKS] __initdata;
static int pall_ents __initdata;

1407
#ifdef CONFIG_DEBUG_PAGEALLOC
1408 1409
static unsigned long __ref kernel_map_range(unsigned long pstart,
					    unsigned long pend, pgprot_t prot)
1410 1411 1412 1413 1414 1415
{
	unsigned long vstart = PAGE_OFFSET + pstart;
	unsigned long vend = PAGE_OFFSET + pend;
	unsigned long alloc_bytes = 0UL;

	if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) {
1416
		prom_printf("kernel_map: Unaligned physmem[%lx:%lx]\n",
1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463
			    vstart, vend);
		prom_halt();
	}

	while (vstart < vend) {
		unsigned long this_end, paddr = __pa(vstart);
		pgd_t *pgd = pgd_offset_k(vstart);
		pud_t *pud;
		pmd_t *pmd;
		pte_t *pte;

		pud = pud_offset(pgd, vstart);
		if (pud_none(*pud)) {
			pmd_t *new;

			new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
			alloc_bytes += PAGE_SIZE;
			pud_populate(&init_mm, pud, new);
		}

		pmd = pmd_offset(pud, vstart);
		if (!pmd_present(*pmd)) {
			pte_t *new;

			new = __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, PAGE_SIZE);
			alloc_bytes += PAGE_SIZE;
			pmd_populate_kernel(&init_mm, pmd, new);
		}

		pte = pte_offset_kernel(pmd, vstart);
		this_end = (vstart + PMD_SIZE) & PMD_MASK;
		if (this_end > vend)
			this_end = vend;

		while (vstart < this_end) {
			pte_val(*pte) = (paddr | pgprot_val(prot));

			vstart += PAGE_SIZE;
			paddr += PAGE_SIZE;
			pte++;
		}
	}

	return alloc_bytes;
}

extern unsigned int kvmap_linear_patch[1];
1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474
#endif /* CONFIG_DEBUG_PAGEALLOC */

static void __init mark_kpte_bitmap(unsigned long start, unsigned long end)
{
	const unsigned long shift_256MB = 28;
	const unsigned long mask_256MB = ((1UL << shift_256MB) - 1UL);
	const unsigned long size_256MB = (1UL << shift_256MB);

	while (start < end) {
		long remains;

1475 1476 1477 1478
		remains = end - start;
		if (remains < size_256MB)
			break;

1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493
		if (start & mask_256MB) {
			start = (start + size_256MB) & ~mask_256MB;
			continue;
		}

		while (remains >= size_256MB) {
			unsigned long index = start >> shift_256MB;

			__set_bit(index, kpte_linear_bitmap);

			start += size_256MB;
			remains -= size_256MB;
		}
	}
}
1494

1495
static void __init init_kpte_bitmap(void)
1496
{
1497
	unsigned long i;
1498 1499

	for (i = 0; i < pall_ents; i++) {
1500 1501
		unsigned long phys_start, phys_end;

1502 1503
		phys_start = pall[i].phys_addr;
		phys_end = phys_start + pall[i].reg_size;
1504 1505

		mark_kpte_bitmap(phys_start, phys_end);
1506 1507
	}
}
1508

1509 1510
static void __init kernel_physical_mapping_init(void)
{
1511
#ifdef CONFIG_DEBUG_PAGEALLOC
1512 1513 1514 1515 1516 1517 1518 1519
	unsigned long i, mem_alloced = 0UL;

	for (i = 0; i < pall_ents; i++) {
		unsigned long phys_start, phys_end;

		phys_start = pall[i].phys_addr;
		phys_end = phys_start + pall[i].reg_size;

1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530
		mem_alloced += kernel_map_range(phys_start, phys_end,
						PAGE_KERNEL);
	}

	printk("Allocated %ld bytes for kernel page tables.\n",
	       mem_alloced);

	kvmap_linear_patch[0] = 0x01000000; /* nop */
	flushi(&kvmap_linear_patch[0]);

	__flush_tlb_all();
1531
#endif
1532 1533
}

1534
#ifdef CONFIG_DEBUG_PAGEALLOC
1535 1536 1537 1538 1539 1540 1541 1542
void kernel_map_pages(struct page *page, int numpages, int enable)
{
	unsigned long phys_start = page_to_pfn(page) << PAGE_SHIFT;
	unsigned long phys_end = phys_start + (numpages * PAGE_SIZE);

	kernel_map_range(phys_start, phys_end,
			 (enable ? PAGE_KERNEL : __pgprot(0)));

1543 1544 1545
	flush_tsb_kernel_range(PAGE_OFFSET + phys_start,
			       PAGE_OFFSET + phys_end);

1546 1547 1548 1549 1550 1551 1552 1553
	/* we should perform an IPI and flush all tlbs,
	 * but that can deadlock->flush only current cpu.
	 */
	__flush_tlb_kernel_range(PAGE_OFFSET + phys_start,
				 PAGE_OFFSET + phys_end);
}
#endif

1554 1555
unsigned long __init find_ecache_flush_span(unsigned long size)
{
1556 1557
	int i;

1558 1559 1560
	for (i = 0; i < pavail_ents; i++) {
		if (pavail[i].reg_size >= size)
			return pavail[i].phys_addr;
1561 1562
	}

1563
	return ~0UL;
1564 1565
}

1566 1567
static void __init tsb_phys_patch(void)
{
1568
	struct tsb_ldquad_phys_patch_entry *pquad;
1569 1570
	struct tsb_phys_patch_entry *p;

1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586
	pquad = &__tsb_ldquad_phys_patch;
	while (pquad < &__tsb_ldquad_phys_patch_end) {
		unsigned long addr = pquad->addr;

		if (tlb_type == hypervisor)
			*(unsigned int *) addr = pquad->sun4v_insn;
		else
			*(unsigned int *) addr = pquad->sun4u_insn;
		wmb();
		__asm__ __volatile__("flush	%0"
				     : /* no outputs */
				     : "r" (addr));

		pquad++;
	}

1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600
	p = &__tsb_phys_patch;
	while (p < &__tsb_phys_patch_end) {
		unsigned long addr = p->addr;

		*(unsigned int *) addr = p->insn;
		wmb();
		__asm__ __volatile__("flush	%0"
				     : /* no outputs */
				     : "r" (addr));

		p++;
	}
}

1601
/* Don't mark as init, we give this to the Hypervisor.  */
1602 1603 1604 1605 1606 1607
#ifndef CONFIG_DEBUG_PAGEALLOC
#define NUM_KTSB_DESCR	2
#else
#define NUM_KTSB_DESCR	1
#endif
static struct hv_tsb_descr ktsb_descr[NUM_KTSB_DESCR];
1608 1609 1610 1611 1612 1613
extern struct tsb swapper_tsb[KERNEL_TSB_NENTRIES];

static void __init sun4v_ktsb_init(void)
{
	unsigned long ktsb_pa;

1614
	/* First KTSB for PAGE_SIZE mappings.  */
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
	ktsb_pa = kern_base + ((unsigned long)&swapper_tsb[0] - KERNBASE);

	switch (PAGE_SIZE) {
	case 8 * 1024:
	default:
		ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_8K;
		ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_8K;
		break;

	case 64 * 1024:
		ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_64K;
		ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_64K;
		break;

	case 512 * 1024:
		ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_512K;
		ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_512K;
		break;

	case 4 * 1024 * 1024:
		ktsb_descr[0].pgsz_idx = HV_PGSZ_IDX_4MB;
		ktsb_descr[0].pgsz_mask = HV_PGSZ_MASK_4MB;
		break;
	};

1640
	ktsb_descr[0].assoc = 1;
1641 1642 1643 1644 1645
	ktsb_descr[0].num_ttes = KERNEL_TSB_NENTRIES;
	ktsb_descr[0].ctx_idx = 0;
	ktsb_descr[0].tsb_base = ktsb_pa;
	ktsb_descr[0].resv = 0;

1646
#ifndef CONFIG_DEBUG_PAGEALLOC
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658
	/* Second KTSB for 4MB/256MB mappings.  */
	ktsb_pa = (kern_base +
		   ((unsigned long)&swapper_4m_tsb[0] - KERNBASE));

	ktsb_descr[1].pgsz_idx = HV_PGSZ_IDX_4MB;
	ktsb_descr[1].pgsz_mask = (HV_PGSZ_MASK_4MB |
				   HV_PGSZ_MASK_256MB);
	ktsb_descr[1].assoc = 1;
	ktsb_descr[1].num_ttes = KERNEL_TSB4M_NENTRIES;
	ktsb_descr[1].ctx_idx = 0;
	ktsb_descr[1].tsb_base = ktsb_pa;
	ktsb_descr[1].resv = 0;
1659
#endif
1660 1661 1662 1663
}

void __cpuinit sun4v_ktsb_register(void)
{
1664
	unsigned long pa, ret;
1665 1666 1667

	pa = kern_base + ((unsigned long)&ktsb_descr[0] - KERNBASE);

1668 1669 1670 1671 1672 1673
	ret = sun4v_mmu_tsb_ctx0(NUM_KTSB_DESCR, pa);
	if (ret != 0) {
		prom_printf("hypervisor_mmu_tsb_ctx0[%lx]: "
			    "errors with %lx\n", pa, ret);
		prom_halt();
	}
1674 1675
}

L
Linus Torvalds 已提交
1676 1677 1678
/* paging_init() sets up the page tables */

static unsigned long last_valid_pfn;
1679
pgd_t swapper_pg_dir[2048];
L
Linus Torvalds 已提交
1680

1681 1682 1683
static void sun4u_pgprot_init(void);
static void sun4v_pgprot_init(void);

L
Linus Torvalds 已提交
1684 1685
void __init paging_init(void)
{
D
David S. Miller 已提交
1686
	unsigned long end_pfn, shift, phys_base;
1687 1688
	unsigned long real_end, i;

1689 1690 1691 1692 1693 1694 1695 1696
	/* These build time checkes make sure that the dcache_dirty_cpu()
	 * page->flags usage will work.
	 *
	 * When a page gets marked as dcache-dirty, we store the
	 * cpu number starting at bit 32 in the page->flags.  Also,
	 * functions like clear_dcache_dirty_cpu use the cpu mask
	 * in 13-bit signed-immediate instruction fields.
	 */
1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708

	/*
	 * Page flags must not reach into upper 32 bits that are used
	 * for the cpu number
	 */
	BUILD_BUG_ON(NR_PAGEFLAGS > 32);

	/*
	 * The bit fields placed in the high range must not reach below
	 * the 32 bit boundary. Otherwise we cannot place the cpu field
	 * at the 32 bit boundary.
	 */
1709
	BUILD_BUG_ON(SECTIONS_WIDTH + NODES_WIDTH + ZONES_WIDTH +
1710 1711
		ilog2(roundup_pow_of_two(NR_CPUS)) > 32);

1712 1713
	BUILD_BUG_ON(NR_CPUS > 4096);

1714 1715 1716
	kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
	kern_size = (unsigned long)&_end - (unsigned long)KERNBASE;

1717
	/* Invalidate both kernel TSBs.  */
1718
	memset(swapper_tsb, 0x40, sizeof(swapper_tsb));
1719
#ifndef CONFIG_DEBUG_PAGEALLOC
1720
	memset(swapper_4m_tsb, 0x40, sizeof(swapper_4m_tsb));
1721
#endif
1722

1723 1724 1725 1726 1727
	if (tlb_type == hypervisor)
		sun4v_pgprot_init();
	else
		sun4u_pgprot_init();

1728 1729
	if (tlb_type == cheetah_plus ||
	    tlb_type == hypervisor)
1730 1731
		tsb_phys_patch();

1732
	if (tlb_type == hypervisor) {
1733
		sun4v_patch_tlb_handlers();
1734 1735
		sun4v_ktsb_init();
	}
1736

1737 1738
	lmb_init();

1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
	/* Find available physical memory...
	 *
	 * Read it twice in order to work around a bug in openfirmware.
	 * The call to grab this table itself can cause openfirmware to
	 * allocate memory, which in turn can take away some space from
	 * the list of available memory.  Reading it twice makes sure
	 * we really do get the final value.
	 */
	read_obp_translations();
	read_obp_memory("reg", &pall[0], &pall_ents);
	read_obp_memory("available", &pavail[0], &pavail_ents);
1750
	read_obp_memory("available", &pavail[0], &pavail_ents);
1751 1752

	phys_base = 0xffffffffffffffffUL;
1753
	for (i = 0; i < pavail_ents; i++) {
1754
		phys_base = min(phys_base, pavail[i].phys_addr);
1755 1756 1757 1758
		lmb_add(pavail[i].phys_addr, pavail[i].reg_size);
	}

	lmb_reserve(kern_base, kern_size);
1759

1760 1761
	find_ramdisk(phys_base);

1762
	lmb_enforce_memory_limit(cmdline_memory_size);
1763

1764 1765 1766
	lmb_analyze();
	lmb_dump_all();

L
Linus Torvalds 已提交
1767 1768
	set_bit(0, mmu_context_bmap);

1769 1770
	shift = kern_base + PAGE_OFFSET - ((unsigned long)KERNBASE);

L
Linus Torvalds 已提交
1771
	real_end = (unsigned long)_end;
1772 1773 1774
	num_kernel_image_mappings = DIV_ROUND_UP(real_end - KERNBASE, 1 << 22);
	printk("Kernel: Using %d locked TLB entries for main kernel image.\n",
	       num_kernel_image_mappings);
1775 1776

	/* Set kernel pgd to upper alias so physical page computations
L
Linus Torvalds 已提交
1777 1778 1779 1780
	 * work.
	 */
	init_mm.pgd += ((shift) / (sizeof(pgd_t)));
	
1781
	memset(swapper_low_pmd_dir, 0, sizeof(swapper_low_pmd_dir));
L
Linus Torvalds 已提交
1782 1783 1784

	/* Now can init the kernel/bad page tables. */
	pud_set(pud_offset(&swapper_pg_dir[0], 0),
1785
		swapper_low_pmd_dir + (shift / sizeof(pgd_t)));
L
Linus Torvalds 已提交
1786
	
1787
	inherit_prom_mappings();
1788
	
1789 1790
	init_kpte_bitmap();

1791 1792
	/* Ok, we can use our TLB miss and window trap handlers safely.  */
	setup_tba();
L
Linus Torvalds 已提交
1793

1794
	__flush_tlb_all();
1795

1796 1797 1798
	if (tlb_type == hypervisor)
		sun4v_ktsb_register();

1799
	prom_build_devicetree();
1800
	of_populate_present_mask();
1801 1802 1803
#ifndef CONFIG_SMP
	of_fill_in_cpu_data();
#endif
1804

1805
	if (tlb_type == hypervisor) {
1806
		sun4v_mdesc_init();
1807
		mdesc_populate_present_mask(cpu_all_mask);
1808 1809 1810
#ifndef CONFIG_SMP
		mdesc_fill_in_cpu_data(cpu_all_mask);
#endif
1811
	}
1812

D
David S. Miller 已提交
1813 1814 1815 1816 1817 1818 1819 1820 1821 1822
	/* Once the OF device tree and MDESC have been setup, we know
	 * the list of possible cpus.  Therefore we can allocate the
	 * IRQ stacks.
	 */
	for_each_possible_cpu(i) {
		/* XXX Use node local allocations... XXX */
		softirq_stack[i] = __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
		hardirq_stack[i] = __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE));
	}

1823
	/* Setup bootmem... */
D
David S. Miller 已提交
1824
	last_valid_pfn = end_pfn = bootmem_init(phys_base);
1825

D
David S. Miller 已提交
1826
#ifndef CONFIG_NEED_MULTIPLE_NODES
1827
	max_mapnr = last_valid_pfn;
D
David S. Miller 已提交
1828
#endif
1829 1830
	kernel_physical_mapping_init();

L
Linus Torvalds 已提交
1831
	{
D
David S. Miller 已提交
1832
		unsigned long max_zone_pfns[MAX_NR_ZONES];
L
Linus Torvalds 已提交
1833

D
David S. Miller 已提交
1834
		memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
L
Linus Torvalds 已提交
1835

D
David S. Miller 已提交
1836
		max_zone_pfns[ZONE_NORMAL] = end_pfn;
L
Linus Torvalds 已提交
1837

D
David S. Miller 已提交
1838
		free_area_init_nodes(max_zone_pfns);
L
Linus Torvalds 已提交
1839 1840
	}

1841
	printk("Booting Linux...\n");
L
Linus Torvalds 已提交
1842 1843
}

1844
int __devinit page_in_phys_avail(unsigned long paddr)
D
David S. Miller 已提交
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878
{
	int i;

	paddr &= PAGE_MASK;

	for (i = 0; i < pavail_ents; i++) {
		unsigned long start, end;

		start = pavail[i].phys_addr;
		end = start + pavail[i].reg_size;

		if (paddr >= start && paddr < end)
			return 1;
	}
	if (paddr >= kern_base && paddr < (kern_base + kern_size))
		return 1;
#ifdef CONFIG_BLK_DEV_INITRD
	if (paddr >= __pa(initrd_start) &&
	    paddr < __pa(PAGE_ALIGN(initrd_end)))
		return 1;
#endif

	return 0;
}

static struct linux_prom64_registers pavail_rescan[MAX_BANKS] __initdata;
static int pavail_rescan_ents __initdata;

/* Certain OBP calls, such as fetching "available" properties, can
 * claim physical memory.  So, along with initializing the valid
 * address bitmap, what we do here is refetch the physical available
 * memory list again, and make sure it provides at least as much
 * memory as 'pavail' does.
 */
1879
static void __init setup_valid_addr_bitmap_from_pavail(unsigned long *bitmap)
L
Linus Torvalds 已提交
1880 1881 1882
{
	int i;

1883
	read_obp_memory("available", &pavail_rescan[0], &pavail_rescan_ents);
L
Linus Torvalds 已提交
1884

1885
	for (i = 0; i < pavail_ents; i++) {
L
Linus Torvalds 已提交
1886 1887
		unsigned long old_start, old_end;

1888
		old_start = pavail[i].phys_addr;
D
David S. Miller 已提交
1889
		old_end = old_start + pavail[i].reg_size;
L
Linus Torvalds 已提交
1890 1891 1892
		while (old_start < old_end) {
			int n;

1893
			for (n = 0; n < pavail_rescan_ents; n++) {
L
Linus Torvalds 已提交
1894 1895
				unsigned long new_start, new_end;

1896 1897 1898
				new_start = pavail_rescan[n].phys_addr;
				new_end = new_start +
					pavail_rescan[n].reg_size;
L
Linus Torvalds 已提交
1899 1900 1901

				if (new_start <= old_start &&
				    new_end >= (old_start + PAGE_SIZE)) {
1902
					set_bit(old_start >> 22, bitmap);
L
Linus Torvalds 已提交
1903 1904 1905
					goto do_next_page;
				}
			}
D
David S. Miller 已提交
1906 1907 1908 1909 1910 1911 1912 1913 1914 1915

			prom_printf("mem_init: Lost memory in pavail\n");
			prom_printf("mem_init: OLD start[%lx] size[%lx]\n",
				    pavail[i].phys_addr,
				    pavail[i].reg_size);
			prom_printf("mem_init: NEW start[%lx] size[%lx]\n",
				    pavail_rescan[i].phys_addr,
				    pavail_rescan[i].reg_size);
			prom_printf("mem_init: Cannot continue, aborting.\n");
			prom_halt();
L
Linus Torvalds 已提交
1916 1917 1918 1919 1920 1921 1922

		do_next_page:
			old_start += PAGE_SIZE;
		}
	}
}

1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933
static void __init patch_tlb_miss_handler_bitmap(void)
{
	extern unsigned int valid_addr_bitmap_insn[];
	extern unsigned int valid_addr_bitmap_patch[];

	valid_addr_bitmap_insn[1] = valid_addr_bitmap_patch[1];
	mb();
	valid_addr_bitmap_insn[0] = valid_addr_bitmap_patch[0];
	flushi(&valid_addr_bitmap_insn[0]);
}

L
Linus Torvalds 已提交
1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945
void __init mem_init(void)
{
	unsigned long codepages, datapages, initpages;
	unsigned long addr, last;

	addr = PAGE_OFFSET + kern_base;
	last = PAGE_ALIGN(kern_size) + addr;
	while (addr < last) {
		set_bit(__pa(addr) >> 22, sparc64_valid_addr_bitmap);
		addr += PAGE_SIZE;
	}

1946 1947
	setup_valid_addr_bitmap_from_pavail(sparc64_valid_addr_bitmap);
	patch_tlb_miss_handler_bitmap();
L
Linus Torvalds 已提交
1948 1949 1950

	high_memory = __va(last_valid_pfn << PAGE_SHIFT);

D
David S. Miller 已提交
1951
#ifdef CONFIG_NEED_MULTIPLE_NODES
1952 1953 1954 1955 1956 1957 1958
	{
		int i;
		for_each_online_node(i) {
			if (NODE_DATA(i)->node_spanned_pages != 0) {
				totalram_pages +=
					free_all_bootmem_node(NODE_DATA(i));
			}
D
David S. Miller 已提交
1959 1960 1961 1962 1963 1964
		}
	}
#else
	totalram_pages = free_all_bootmem();
#endif

1965 1966 1967
	/* We subtract one to account for the mem_map_zero page
	 * allocated below.
	 */
D
David S. Miller 已提交
1968 1969
	totalram_pages -= 1;
	num_physpages = totalram_pages;
L
Linus Torvalds 已提交
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988

	/*
	 * Set up the zero page, mark it reserved, so that page count
	 * is not manipulated when freeing the page from user ptes.
	 */
	mem_map_zero = alloc_pages(GFP_KERNEL|__GFP_ZERO, 0);
	if (mem_map_zero == NULL) {
		prom_printf("paging_init: Cannot alloc zero page.\n");
		prom_halt();
	}
	SetPageReserved(mem_map_zero);

	codepages = (((unsigned long) _etext) - ((unsigned long) _start));
	codepages = PAGE_ALIGN(codepages) >> PAGE_SHIFT;
	datapages = (((unsigned long) _edata) - ((unsigned long) _etext));
	datapages = PAGE_ALIGN(datapages) >> PAGE_SHIFT;
	initpages = (((unsigned long) __init_end) - ((unsigned long) __init_begin));
	initpages = PAGE_ALIGN(initpages) >> PAGE_SHIFT;

C
Christoph Lameter 已提交
1989
	printk("Memory: %luk available (%ldk kernel code, %ldk data, %ldk init) [%016lx,%016lx]\n",
L
Linus Torvalds 已提交
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
	       nr_free_pages() << (PAGE_SHIFT-10),
	       codepages << (PAGE_SHIFT-10),
	       datapages << (PAGE_SHIFT-10), 
	       initpages << (PAGE_SHIFT-10), 
	       PAGE_OFFSET, (last_valid_pfn << PAGE_SHIFT));

	if (tlb_type == cheetah || tlb_type == cheetah_plus)
		cheetah_ecache_flush_init();
}

2000
void free_initmem(void)
L
Linus Torvalds 已提交
2001 2002
{
	unsigned long addr, initend;
2003 2004 2005 2006 2007 2008 2009 2010 2011
	int do_free = 1;

	/* If the physical memory maps were trimmed by kernel command
	 * line options, don't even try freeing this initmem stuff up.
	 * The kernel image could have been in the trimmed out region
	 * and if so the freeing below will free invalid page structs.
	 */
	if (cmdline_memory_size)
		do_free = 0;
L
Linus Torvalds 已提交
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024

	/*
	 * The init section is aligned to 8k in vmlinux.lds. Page align for >8k pagesizes.
	 */
	addr = PAGE_ALIGN((unsigned long)(__init_begin));
	initend = (unsigned long)(__init_end) & PAGE_MASK;
	for (; addr < initend; addr += PAGE_SIZE) {
		unsigned long page;
		struct page *p;

		page = (addr +
			((unsigned long) __va(kern_base)) -
			((unsigned long) KERNBASE));
2025
		memset((void *)addr, POISON_FREE_INITMEM, PAGE_SIZE);
L
Linus Torvalds 已提交
2026

2027 2028 2029 2030 2031 2032 2033 2034 2035
		if (do_free) {
			p = virt_to_page(page);

			ClearPageReserved(p);
			init_page_count(p);
			__free_page(p);
			num_physpages++;
			totalram_pages++;
		}
L
Linus Torvalds 已提交
2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047
	}
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	if (start < end)
		printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
	for (; start < end; start += PAGE_SIZE) {
		struct page *p = virt_to_page(start);

		ClearPageReserved(p);
2048
		init_page_count(p);
L
Linus Torvalds 已提交
2049 2050 2051 2052 2053 2054
		__free_page(p);
		num_physpages++;
		totalram_pages++;
	}
}
#endif
2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067

#define _PAGE_CACHE_4U	(_PAGE_CP_4U | _PAGE_CV_4U)
#define _PAGE_CACHE_4V	(_PAGE_CP_4V | _PAGE_CV_4V)
#define __DIRTY_BITS_4U	 (_PAGE_MODIFIED_4U | _PAGE_WRITE_4U | _PAGE_W_4U)
#define __DIRTY_BITS_4V	 (_PAGE_MODIFIED_4V | _PAGE_WRITE_4V | _PAGE_W_4V)
#define __ACCESS_BITS_4U (_PAGE_ACCESSED_4U | _PAGE_READ_4U | _PAGE_R)
#define __ACCESS_BITS_4V (_PAGE_ACCESSED_4V | _PAGE_READ_4V | _PAGE_R)

pgprot_t PAGE_KERNEL __read_mostly;
EXPORT_SYMBOL(PAGE_KERNEL);

pgprot_t PAGE_KERNEL_LOCKED __read_mostly;
pgprot_t PAGE_COPY __read_mostly;
2068 2069 2070 2071

pgprot_t PAGE_SHARED __read_mostly;
EXPORT_SYMBOL(PAGE_SHARED);

2072 2073 2074
unsigned long pg_iobits __read_mostly;

unsigned long _PAGE_IE __read_mostly;
2075
EXPORT_SYMBOL(_PAGE_IE);
2076

2077
unsigned long _PAGE_E __read_mostly;
2078 2079
EXPORT_SYMBOL(_PAGE_E);

2080
unsigned long _PAGE_CACHE __read_mostly;
2081
EXPORT_SYMBOL(_PAGE_CACHE);
2082

D
David Miller 已提交
2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126
#ifdef CONFIG_SPARSEMEM_VMEMMAP
unsigned long vmemmap_table[VMEMMAP_SIZE];

int __meminit vmemmap_populate(struct page *start, unsigned long nr, int node)
{
	unsigned long vstart = (unsigned long) start;
	unsigned long vend = (unsigned long) (start + nr);
	unsigned long phys_start = (vstart - VMEMMAP_BASE);
	unsigned long phys_end = (vend - VMEMMAP_BASE);
	unsigned long addr = phys_start & VMEMMAP_CHUNK_MASK;
	unsigned long end = VMEMMAP_ALIGN(phys_end);
	unsigned long pte_base;

	pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4U |
		    _PAGE_CP_4U | _PAGE_CV_4U |
		    _PAGE_P_4U | _PAGE_W_4U);
	if (tlb_type == hypervisor)
		pte_base = (_PAGE_VALID | _PAGE_SZ4MB_4V |
			    _PAGE_CP_4V | _PAGE_CV_4V |
			    _PAGE_P_4V | _PAGE_W_4V);

	for (; addr < end; addr += VMEMMAP_CHUNK) {
		unsigned long *vmem_pp =
			vmemmap_table + (addr >> VMEMMAP_CHUNK_SHIFT);
		void *block;

		if (!(*vmem_pp & _PAGE_VALID)) {
			block = vmemmap_alloc_block(1UL << 22, node);
			if (!block)
				return -ENOMEM;

			*vmem_pp = pte_base | __pa(block);

			printk(KERN_INFO "[%p-%p] page_structs=%lu "
			       "node=%d entry=%lu/%lu\n", start, block, nr,
			       node,
			       addr >> VMEMMAP_CHUNK_SHIFT,
			       VMEMMAP_SIZE >> VMEMMAP_CHUNK_SHIFT);
		}
	}
	return 0;
}
#endif /* CONFIG_SPARSEMEM_VMEMMAP */

2127 2128 2129 2130 2131 2132 2133
static void prot_init_common(unsigned long page_none,
			     unsigned long page_shared,
			     unsigned long page_copy,
			     unsigned long page_readonly,
			     unsigned long page_exec_bit)
{
	PAGE_COPY = __pgprot(page_copy);
2134
	PAGE_SHARED = __pgprot(page_shared);
2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174

	protection_map[0x0] = __pgprot(page_none);
	protection_map[0x1] = __pgprot(page_readonly & ~page_exec_bit);
	protection_map[0x2] = __pgprot(page_copy & ~page_exec_bit);
	protection_map[0x3] = __pgprot(page_copy & ~page_exec_bit);
	protection_map[0x4] = __pgprot(page_readonly);
	protection_map[0x5] = __pgprot(page_readonly);
	protection_map[0x6] = __pgprot(page_copy);
	protection_map[0x7] = __pgprot(page_copy);
	protection_map[0x8] = __pgprot(page_none);
	protection_map[0x9] = __pgprot(page_readonly & ~page_exec_bit);
	protection_map[0xa] = __pgprot(page_shared & ~page_exec_bit);
	protection_map[0xb] = __pgprot(page_shared & ~page_exec_bit);
	protection_map[0xc] = __pgprot(page_readonly);
	protection_map[0xd] = __pgprot(page_readonly);
	protection_map[0xe] = __pgprot(page_shared);
	protection_map[0xf] = __pgprot(page_shared);
}

static void __init sun4u_pgprot_init(void)
{
	unsigned long page_none, page_shared, page_copy, page_readonly;
	unsigned long page_exec_bit;

	PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
				_PAGE_CACHE_4U | _PAGE_P_4U |
				__ACCESS_BITS_4U | __DIRTY_BITS_4U |
				_PAGE_EXEC_4U);
	PAGE_KERNEL_LOCKED = __pgprot (_PAGE_PRESENT_4U | _PAGE_VALID |
				       _PAGE_CACHE_4U | _PAGE_P_4U |
				       __ACCESS_BITS_4U | __DIRTY_BITS_4U |
				       _PAGE_EXEC_4U | _PAGE_L_4U);

	_PAGE_IE = _PAGE_IE_4U;
	_PAGE_E = _PAGE_E_4U;
	_PAGE_CACHE = _PAGE_CACHE_4U;

	pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4U | __DIRTY_BITS_4U |
		     __ACCESS_BITS_4U | _PAGE_E_4U);

2175 2176
#ifdef CONFIG_DEBUG_PAGEALLOC
	kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZBITS_4U) ^
2177
		0xfffff80000000000UL;
2178
#else
2179
	kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4U) ^
2180
		0xfffff80000000000UL;
2181
#endif
2182 2183 2184 2185 2186
	kern_linear_pte_xor[0] |= (_PAGE_CP_4U | _PAGE_CV_4U |
				   _PAGE_P_4U | _PAGE_W_4U);

	/* XXX Should use 256MB on Panther. XXX */
	kern_linear_pte_xor[1] = kern_linear_pte_xor[0];
2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222

	_PAGE_SZBITS = _PAGE_SZBITS_4U;
	_PAGE_ALL_SZ_BITS =  (_PAGE_SZ4MB_4U | _PAGE_SZ512K_4U |
			      _PAGE_SZ64K_4U | _PAGE_SZ8K_4U |
			      _PAGE_SZ32MB_4U | _PAGE_SZ256MB_4U);


	page_none = _PAGE_PRESENT_4U | _PAGE_ACCESSED_4U | _PAGE_CACHE_4U;
	page_shared = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
		       __ACCESS_BITS_4U | _PAGE_WRITE_4U | _PAGE_EXEC_4U);
	page_copy   = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
		       __ACCESS_BITS_4U | _PAGE_EXEC_4U);
	page_readonly   = (_PAGE_VALID | _PAGE_PRESENT_4U | _PAGE_CACHE_4U |
			   __ACCESS_BITS_4U | _PAGE_EXEC_4U);

	page_exec_bit = _PAGE_EXEC_4U;

	prot_init_common(page_none, page_shared, page_copy, page_readonly,
			 page_exec_bit);
}

static void __init sun4v_pgprot_init(void)
{
	unsigned long page_none, page_shared, page_copy, page_readonly;
	unsigned long page_exec_bit;

	PAGE_KERNEL = __pgprot (_PAGE_PRESENT_4V | _PAGE_VALID |
				_PAGE_CACHE_4V | _PAGE_P_4V |
				__ACCESS_BITS_4V | __DIRTY_BITS_4V |
				_PAGE_EXEC_4V);
	PAGE_KERNEL_LOCKED = PAGE_KERNEL;

	_PAGE_IE = _PAGE_IE_4V;
	_PAGE_E = _PAGE_E_4V;
	_PAGE_CACHE = _PAGE_CACHE_4V;

2223 2224
#ifdef CONFIG_DEBUG_PAGEALLOC
	kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZBITS_4V) ^
2225
		0xfffff80000000000UL;
2226
#else
2227
	kern_linear_pte_xor[0] = (_PAGE_VALID | _PAGE_SZ4MB_4V) ^
2228
		0xfffff80000000000UL;
2229
#endif
2230 2231 2232
	kern_linear_pte_xor[0] |= (_PAGE_CP_4V | _PAGE_CV_4V |
				   _PAGE_P_4V | _PAGE_W_4V);

2233 2234
#ifdef CONFIG_DEBUG_PAGEALLOC
	kern_linear_pte_xor[1] = (_PAGE_VALID | _PAGE_SZBITS_4V) ^
2235
		0xfffff80000000000UL;
2236
#else
2237
	kern_linear_pte_xor[1] = (_PAGE_VALID | _PAGE_SZ256MB_4V) ^
2238
		0xfffff80000000000UL;
2239
#endif
2240 2241
	kern_linear_pte_xor[1] |= (_PAGE_CP_4V | _PAGE_CV_4V |
				   _PAGE_P_4V | _PAGE_W_4V);
2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297

	pg_iobits = (_PAGE_VALID | _PAGE_PRESENT_4V | __DIRTY_BITS_4V |
		     __ACCESS_BITS_4V | _PAGE_E_4V);

	_PAGE_SZBITS = _PAGE_SZBITS_4V;
	_PAGE_ALL_SZ_BITS = (_PAGE_SZ16GB_4V | _PAGE_SZ2GB_4V |
			     _PAGE_SZ256MB_4V | _PAGE_SZ32MB_4V |
			     _PAGE_SZ4MB_4V | _PAGE_SZ512K_4V |
			     _PAGE_SZ64K_4V | _PAGE_SZ8K_4V);

	page_none = _PAGE_PRESENT_4V | _PAGE_ACCESSED_4V | _PAGE_CACHE_4V;
	page_shared = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
		       __ACCESS_BITS_4V | _PAGE_WRITE_4V | _PAGE_EXEC_4V);
	page_copy   = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
		       __ACCESS_BITS_4V | _PAGE_EXEC_4V);
	page_readonly = (_PAGE_VALID | _PAGE_PRESENT_4V | _PAGE_CACHE_4V |
			 __ACCESS_BITS_4V | _PAGE_EXEC_4V);

	page_exec_bit = _PAGE_EXEC_4V;

	prot_init_common(page_none, page_shared, page_copy, page_readonly,
			 page_exec_bit);
}

unsigned long pte_sz_bits(unsigned long sz)
{
	if (tlb_type == hypervisor) {
		switch (sz) {
		case 8 * 1024:
		default:
			return _PAGE_SZ8K_4V;
		case 64 * 1024:
			return _PAGE_SZ64K_4V;
		case 512 * 1024:
			return _PAGE_SZ512K_4V;
		case 4 * 1024 * 1024:
			return _PAGE_SZ4MB_4V;
		};
	} else {
		switch (sz) {
		case 8 * 1024:
		default:
			return _PAGE_SZ8K_4U;
		case 64 * 1024:
			return _PAGE_SZ64K_4U;
		case 512 * 1024:
			return _PAGE_SZ512K_4U;
		case 4 * 1024 * 1024:
			return _PAGE_SZ4MB_4U;
		};
	}
}

pte_t mk_pte_io(unsigned long page, pgprot_t prot, int space, unsigned long page_size)
{
	pte_t pte;
2298 2299

	pte_val(pte)  = page | pgprot_val(pgprot_noncached(prot));
2300 2301 2302
	pte_val(pte) |= (((unsigned long)space) << 32);
	pte_val(pte) |= pte_sz_bits(page_size);

2303
	return pte;
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331
}

static unsigned long kern_large_tte(unsigned long paddr)
{
	unsigned long val;

	val = (_PAGE_VALID | _PAGE_SZ4MB_4U |
	       _PAGE_CP_4U | _PAGE_CV_4U | _PAGE_P_4U |
	       _PAGE_EXEC_4U | _PAGE_L_4U | _PAGE_W_4U);
	if (tlb_type == hypervisor)
		val = (_PAGE_VALID | _PAGE_SZ4MB_4V |
		       _PAGE_CP_4V | _PAGE_CV_4V | _PAGE_P_4V |
		       _PAGE_EXEC_4V | _PAGE_W_4V);

	return val | paddr;
}

/* If not locked, zap it. */
void __flush_tlb_all(void)
{
	unsigned long pstate;
	int i;

	__asm__ __volatile__("flushw\n\t"
			     "rdpr	%%pstate, %0\n\t"
			     "wrpr	%0, %1, %%pstate"
			     : "=r" (pstate)
			     : "i" (PSTATE_IE));
2332 2333 2334
	if (tlb_type == hypervisor) {
		sun4v_mmu_demap_all();
	} else if (tlb_type == spitfire) {
2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378
		for (i = 0; i < 64; i++) {
			/* Spitfire Errata #32 workaround */
			/* NOTE: Always runs on spitfire, so no
			 *       cheetah+ page size encodings.
			 */
			__asm__ __volatile__("stxa	%0, [%1] %2\n\t"
					     "flush	%%g6"
					     : /* No outputs */
					     : "r" (0),
					     "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));

			if (!(spitfire_get_dtlb_data(i) & _PAGE_L_4U)) {
				__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
						     "membar #Sync"
						     : /* no outputs */
						     : "r" (TLB_TAG_ACCESS), "i" (ASI_DMMU));
				spitfire_put_dtlb_data(i, 0x0UL);
			}

			/* Spitfire Errata #32 workaround */
			/* NOTE: Always runs on spitfire, so no
			 *       cheetah+ page size encodings.
			 */
			__asm__ __volatile__("stxa	%0, [%1] %2\n\t"
					     "flush	%%g6"
					     : /* No outputs */
					     : "r" (0),
					     "r" (PRIMARY_CONTEXT), "i" (ASI_DMMU));

			if (!(spitfire_get_itlb_data(i) & _PAGE_L_4U)) {
				__asm__ __volatile__("stxa %%g0, [%0] %1\n\t"
						     "membar #Sync"
						     : /* no outputs */
						     : "r" (TLB_TAG_ACCESS), "i" (ASI_IMMU));
				spitfire_put_itlb_data(i, 0x0UL);
			}
		}
	} else if (tlb_type == cheetah || tlb_type == cheetah_plus) {
		cheetah_flush_dtlb_all();
		cheetah_flush_itlb_all();
	}
	__asm__ __volatile__("wrpr	%0, 0, %%pstate"
			     : : "r" (pstate));
}