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raspberrypi-kernel
提交 15902bf6 编写于 作者: M Michal Simek
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microblaze_mmu_v2: Page table - ioremap - pgtable.c/h, section update 

Signed-off-by: NMichal Simek <monstr@monstr.eu>
上级 fc34d1eb
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arch/microblaze/include/asm/pgtable.h
浏览文件 @ 15902bf6
/*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
......@@ -14,6 +16,8 @@
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
remap_pfn_range(vma, vaddr, pfn, size, prot)
#ifndef CONFIG_MMU
#define pgd_present(pgd) (1) /* pages are always present on non MMU */
#define pgd_none(pgd) (0)
#define pgd_bad(pgd) (0)
......@@ -47,6 +51,538 @@ static inline int pte_file(pte_t pte) { return 0; }
#define arch_enter_lazy_cpu_mode() do {} while (0)
#else /* CONFIG_MMU */
#include <asm-generic/4level-fixup.h>
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#include <linux/sched.h>
#include <linux/threads.h>
#include <asm/processor.h> /* For TASK_SIZE */
#include <asm/mmu.h>
#include <asm/page.h>
#define FIRST_USER_ADDRESS 0
extern unsigned long va_to_phys(unsigned long address);
extern pte_t *va_to_pte(unsigned long address);
extern unsigned long ioremap_bot, ioremap_base;
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
static inline int pte_special(pte_t pte) { return 0; }
static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
/* Start and end of the vmalloc area. */
/* Make sure to map the vmalloc area above the pinned kernel memory area
of 32Mb. */
#define VMALLOC_START (CONFIG_KERNEL_START + \
max(32 * 1024 * 1024UL, memory_size))
#define VMALLOC_END ioremap_bot
#define VMALLOC_VMADDR(x) ((unsigned long)(x))
#endif /* __ASSEMBLY__ */
/*
* The MicroBlaze MMU is identical to the PPC-40x MMU, and uses a hash
* table containing PTEs, together with a set of 16 segment registers, to
* define the virtual to physical address mapping.
*
* We use the hash table as an extended TLB, i.e. a cache of currently
* active mappings. We maintain a two-level page table tree, much
* like that used by the i386, for the sake of the Linux memory
* management code. Low-level assembler code in hashtable.S
* (procedure hash_page) is responsible for extracting ptes from the
* tree and putting them into the hash table when necessary, and
* updating the accessed and modified bits in the page table tree.
*/
/*
* The MicroBlaze processor has a TLB architecture identical to PPC-40x. The
* instruction and data sides share a unified, 64-entry, semi-associative
* TLB which is maintained totally under software control. In addition, the
* instruction side has a hardware-managed, 2,4, or 8-entry, fully-associative
* TLB which serves as a first level to the shared TLB. These two TLBs are
* known as the UTLB and ITLB, respectively (see "mmu.h" for definitions).
*/
/*
* The normal case is that PTEs are 32-bits and we have a 1-page
* 1024-entry pgdir pointing to 1-page 1024-entry PTE pages. -- paulus
*
*/
/* PMD_SHIFT determines the size of the area mapped by the PTE pages */
#define PMD_SHIFT (PAGE_SHIFT + PTE_SHIFT)
#define PMD_SIZE (1UL << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE-1))
/* PGDIR_SHIFT determines what a top-level page table entry can map */
#define PGDIR_SHIFT PMD_SHIFT
#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE-1))
/*
* entries per page directory level: our page-table tree is two-level, so
* we don't really have any PMD directory.
*/
#define PTRS_PER_PTE (1 << PTE_SHIFT)
#define PTRS_PER_PMD 1
#define PTRS_PER_PGD (1 << (32 - PGDIR_SHIFT))
#define USER_PTRS_PER_PGD (TASK_SIZE / PGDIR_SIZE)
#define FIRST_USER_PGD_NR 0
#define USER_PGD_PTRS (PAGE_OFFSET >> PGDIR_SHIFT)
#define KERNEL_PGD_PTRS (PTRS_PER_PGD-USER_PGD_PTRS)
#define pte_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pte "PTE_FMT".\n", \
__FILE__, __LINE__, pte_val(e))
#define pmd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pmd %08lx.\n", \
__FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
printk(KERN_ERR "%s:%d: bad pgd %08lx.\n", \
__FILE__, __LINE__, pgd_val(e))
/*
* Bits in a linux-style PTE. These match the bits in the
* (hardware-defined) PTE as closely as possible.
*/
/* There are several potential gotchas here. The hardware TLBLO
* field looks like this:
*
* 0 1 2 3 4 ... 18 19 20 21 22 23 24 25 26 27 28 29 30 31
* RPN..................... 0 0 EX WR ZSEL....... W I M G
*
* Where possible we make the Linux PTE bits match up with this
*
* - bits 20 and 21 must be cleared, because we use 4k pages (4xx can
* support down to 1k pages), this is done in the TLBMiss exception
* handler.
* - We use only zones 0 (for kernel pages) and 1 (for user pages)
* of the 16 available. Bit 24-26 of the TLB are cleared in the TLB
* miss handler. Bit 27 is PAGE_USER, thus selecting the correct
* zone.
* - PRESENT *must* be in the bottom two bits because swap cache
* entries use the top 30 bits. Because 4xx doesn't support SMP
* anyway, M is irrelevant so we borrow it for PAGE_PRESENT. Bit 30
* is cleared in the TLB miss handler before the TLB entry is loaded.
* - All other bits of the PTE are loaded into TLBLO without
* * modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for
* software PTE bits. We actually use use bits 21, 24, 25, and
* 30 respectively for the software bits: ACCESSED, DIRTY, RW, and
* PRESENT.
*/
/* Definitions for MicroBlaze. */
#define _PAGE_GUARDED 0x001 /* G: page is guarded from prefetch */
#define _PAGE_PRESENT 0x002 /* software: PTE contains a translation */
#define _PAGE_NO_CACHE 0x004 /* I: caching is inhibited */
#define _PAGE_WRITETHRU 0x008 /* W: caching is write-through */
#define _PAGE_USER 0x010 /* matches one of the zone permission bits */
#define _PAGE_RW 0x040 /* software: Writes permitted */
#define _PAGE_DIRTY 0x080 /* software: dirty page */
#define _PAGE_HWWRITE 0x100 /* hardware: Dirty & RW, set in exception */
#define _PAGE_HWEXEC 0x200 /* hardware: EX permission */
#define _PAGE_ACCESSED 0x400 /* software: R: page referenced */
#define _PMD_PRESENT PAGE_MASK
/*
* Some bits are unused...
*/
#ifndef _PAGE_HASHPTE
#define _PAGE_HASHPTE 0
#endif
#ifndef _PTE_NONE_MASK
#define _PTE_NONE_MASK 0
#endif
#ifndef _PAGE_SHARED
#define _PAGE_SHARED 0
#endif
#ifndef _PAGE_HWWRITE
#define _PAGE_HWWRITE 0
#endif
#ifndef _PAGE_HWEXEC
#define _PAGE_HWEXEC 0
#endif
#ifndef _PAGE_EXEC
#define _PAGE_EXEC 0
#endif
#define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)
/*
* Note: the _PAGE_COHERENT bit automatically gets set in the hardware
* PTE if CONFIG_SMP is defined (hash_page does this); there is no need
* to have it in the Linux PTE, and in fact the bit could be reused for
* another purpose. -- paulus.
*/
#define _PAGE_BASE (_PAGE_PRESENT | _PAGE_ACCESSED)
#define _PAGE_WRENABLE (_PAGE_RW | _PAGE_DIRTY | _PAGE_HWWRITE)
#define _PAGE_KERNEL \
(_PAGE_BASE | _PAGE_WRENABLE | _PAGE_SHARED | _PAGE_HWEXEC)
#define _PAGE_IO (_PAGE_KERNEL | _PAGE_NO_CACHE | _PAGE_GUARDED)
#define PAGE_NONE __pgprot(_PAGE_BASE)
#define PAGE_READONLY __pgprot(_PAGE_BASE | _PAGE_USER)
#define PAGE_READONLY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
#define PAGE_SHARED __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW)
#define PAGE_SHARED_X \
__pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_RW | _PAGE_EXEC)
#define PAGE_COPY __pgprot(_PAGE_BASE | _PAGE_USER)
#define PAGE_COPY_X __pgprot(_PAGE_BASE | _PAGE_USER | _PAGE_EXEC)
#define PAGE_KERNEL __pgprot(_PAGE_KERNEL)
#define PAGE_KERNEL_RO __pgprot(_PAGE_BASE | _PAGE_SHARED)
#define PAGE_KERNEL_CI __pgprot(_PAGE_IO)
/*
* We consider execute permission the same as read.
* Also, write permissions imply read permissions.
*/
#define __P000 PAGE_NONE
#define __P001 PAGE_READONLY_X
#define __P010 PAGE_COPY
#define __P011 PAGE_COPY_X
#define __P100 PAGE_READONLY
#define __P101 PAGE_READONLY_X
#define __P110 PAGE_COPY
#define __P111 PAGE_COPY_X
#define __S000 PAGE_NONE
#define __S001 PAGE_READONLY_X
#define __S010 PAGE_SHARED
#define __S011 PAGE_SHARED_X
#define __S100 PAGE_READONLY
#define __S101 PAGE_READONLY_X
#define __S110 PAGE_SHARED
#define __S111 PAGE_SHARED_X
#ifndef __ASSEMBLY__
/*
* ZERO_PAGE is a global shared page that is always zero: used
* for zero-mapped memory areas etc..
*/
extern unsigned long empty_zero_page[1024];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
#endif /* __ASSEMBLY__ */
#define pte_none(pte) ((pte_val(pte) & ~_PTE_NONE_MASK) == 0)
#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
#define pte_clear(mm, addr, ptep) \
do { set_pte_at((mm), (addr), (ptep), __pte(0)); } while (0)
#define pmd_none(pmd) (!pmd_val(pmd))
#define pmd_bad(pmd) ((pmd_val(pmd) & _PMD_PRESENT) == 0)
#define pmd_present(pmd) ((pmd_val(pmd) & _PMD_PRESENT) != 0)
#define pmd_clear(pmdp) do { pmd_val(*(pmdp)) = 0; } while (0)
#define pte_page(x) (mem_map + (unsigned long) \
((pte_val(x) - memory_start) >> PAGE_SHIFT))
#define PFN_SHIFT_OFFSET (PAGE_SHIFT)
#define pte_pfn(x) (pte_val(x) >> PFN_SHIFT_OFFSET)
#define pfn_pte(pfn, prot) \
__pte(((pte_basic_t)(pfn) << PFN_SHIFT_OFFSET) | pgprot_val(prot))
#ifndef __ASSEMBLY__
/*
* The "pgd_xxx()" functions here are trivial for a folded two-level
* setup: the pgd is never bad, and a pmd always exists (as it's folded
* into the pgd entry)
*/
static inline int pgd_none(pgd_t pgd) { return 0; }
static inline int pgd_bad(pgd_t pgd) { return 0; }
static inline int pgd_present(pgd_t pgd) { return 1; }
#define pgd_clear(xp) do { } while (0)
#define pgd_page(pgd) \
((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
*/
static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
/* FIXME */
static inline int pte_file(pte_t pte) { return 0; }
static inline void pte_uncache(pte_t pte) { pte_val(pte) |= _PAGE_NO_CACHE; }
static inline void pte_cache(pte_t pte) { pte_val(pte) &= ~_PAGE_NO_CACHE; }
static inline pte_t pte_rdprotect(pte_t pte) \
{ pte_val(pte) &= ~_PAGE_USER; return pte; }
static inline pte_t pte_wrprotect(pte_t pte) \
{ pte_val(pte) &= ~(_PAGE_RW | _PAGE_HWWRITE); return pte; }
static inline pte_t pte_exprotect(pte_t pte) \
{ pte_val(pte) &= ~_PAGE_EXEC; return pte; }
static inline pte_t pte_mkclean(pte_t pte) \
{ pte_val(pte) &= ~(_PAGE_DIRTY | _PAGE_HWWRITE); return pte; }
static inline pte_t pte_mkold(pte_t pte) \
{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkread(pte_t pte) \
{ pte_val(pte) |= _PAGE_USER; return pte; }
static inline pte_t pte_mkexec(pte_t pte) \
{ pte_val(pte) |= _PAGE_USER | _PAGE_EXEC; return pte; }
static inline pte_t pte_mkwrite(pte_t pte) \
{ pte_val(pte) |= _PAGE_RW; return pte; }
static inline pte_t pte_mkdirty(pte_t pte) \
{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
static inline pte_t pte_mkyoung(pte_t pte) \
{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
/*
* Conversion functions: convert a page and protection to a page entry,
* and a page entry and page directory to the page they refer to.
*/
static inline pte_t mk_pte_phys(phys_addr_t physpage, pgprot_t pgprot)
{
pte_t pte;
pte_val(pte) = physpage | pgprot_val(pgprot);
return pte;
}
#define mk_pte(page, pgprot) \
({ \
pte_t pte; \
pte_val(pte) = (((page - mem_map) << PAGE_SHIFT) + memory_start) | \
pgprot_val(pgprot); \
pte; \
})
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot);
return pte;
}
/*
* Atomic PTE updates.
*
* pte_update clears and sets bit atomically, and returns
* the old pte value.
* The ((unsigned long)(p+1) - 4) hack is to get to the least-significant
* 32 bits of the PTE regardless of whether PTEs are 32 or 64 bits.
*/
static inline unsigned long pte_update(pte_t *p, unsigned long clr,
unsigned long set)
{
unsigned long old, tmp, msr;
__asm__ __volatile__("\
msrclr %2, 0x2\n\
nop\n\
lw %0, %4, r0\n\
andn %1, %0, %5\n\
or %1, %1, %6\n\
sw %1, %4, r0\n\
mts rmsr, %2\n\
nop"
: "=&r" (old), "=&r" (tmp), "=&r" (msr), "=m" (*p)
: "r" ((unsigned long)(p+1) - 4), "r" (clr), "r" (set), "m" (*p)
: "cc");
return old;
}
/*
* set_pte stores a linux PTE into the linux page table.
*/
static inline void set_pte(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
*ptep = pte;
}
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
*ptep = pte;
}
static inline int ptep_test_and_clear_young(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
return (pte_update(ptep, _PAGE_ACCESSED, 0) & _PAGE_ACCESSED) != 0;
}
static inline int ptep_test_and_clear_dirty(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
return (pte_update(ptep, \
(_PAGE_DIRTY | _PAGE_HWWRITE), 0) & _PAGE_DIRTY) != 0;
}
static inline pte_t ptep_get_and_clear(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
return __pte(pte_update(ptep, ~_PAGE_HASHPTE, 0));
}
/*static inline void ptep_set_wrprotect(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
pte_update(ptep, (_PAGE_RW | _PAGE_HWWRITE), 0);
}*/
static inline void ptep_mkdirty(struct mm_struct *mm,
unsigned long addr, pte_t *ptep)
{
pte_update(ptep, 0, _PAGE_DIRTY);
}
/*#define pte_same(A,B) (((pte_val(A) ^ pte_val(B)) & ~_PAGE_HASHPTE) == 0)*/
/* Convert pmd entry to page */
/* our pmd entry is an effective address of pte table*/
/* returns effective address of the pmd entry*/
#define pmd_page_kernel(pmd) ((unsigned long) (pmd_val(pmd) & PAGE_MASK))
/* returns struct *page of the pmd entry*/
#define pmd_page(pmd) (pfn_to_page(__pa(pmd_val(pmd)) >> PAGE_SHIFT))
/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)
/* to find an entry in a page-table-directory */
#define pgd_index(address) ((address) >> PGDIR_SHIFT)
#define pgd_offset(mm, address) ((mm)->pgd + pgd_index(address))
/* Find an entry in the second-level page table.. */
static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
{
return (pmd_t *) dir;
}
/* Find an entry in the third-level page table.. */
#define pte_index(address) \
(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir, addr) \
((pte_t *) pmd_page_kernel(*(dir)) + pte_index(addr))
#define pte_offset_map(dir, addr) \
((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE0) + pte_index(addr))
#define pte_offset_map_nested(dir, addr) \
((pte_t *) kmap_atomic(pmd_page(*(dir)), KM_PTE1) + pte_index(addr))
#define pte_unmap(pte) kunmap_atomic(pte, KM_PTE0)
#define pte_unmap_nested(pte) kunmap_atomic(pte, KM_PTE1)
/* Encode and decode a nonlinear file mapping entry */
#define PTE_FILE_MAX_BITS 29
#define pte_to_pgoff(pte) (pte_val(pte) >> 3)
#define pgoff_to_pte(off) ((pte_t) { ((off) << 3) })
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
/*
* When flushing the tlb entry for a page, we also need to flush the hash
* table entry. flush_hash_page is assembler (for speed) in hashtable.S.
*/
extern int flush_hash_page(unsigned context, unsigned long va, pte_t *ptep);
/* Add an HPTE to the hash table */
extern void add_hash_page(unsigned context, unsigned long va, pte_t *ptep);
/*
* Encode and decode a swap entry.
* Note that the bits we use in a PTE for representing a swap entry
* must not include the _PAGE_PRESENT bit, or the _PAGE_HASHPTE bit
* (if used). -- paulus
*/
#define __swp_type(entry) ((entry).val & 0x3f)
#define __swp_offset(entry) ((entry).val >> 6)
#define __swp_entry(type, offset) \
((swp_entry_t) { (type) | ((offset) << 6) })
#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 2 })
#define __swp_entry_to_pte(x) ((pte_t) { (x).val << 2 })
/* CONFIG_APUS */
/* For virtual address to physical address conversion */
extern void cache_clear(__u32 addr, int length);
extern void cache_push(__u32 addr, int length);
extern int mm_end_of_chunk(unsigned long addr, int len);
extern unsigned long iopa(unsigned long addr);
/* extern unsigned long mm_ptov(unsigned long addr) \
__attribute__ ((const)); TBD */
/* Values for nocacheflag and cmode */
/* These are not used by the APUS kernel_map, but prevents
* compilation errors.
*/
#define IOMAP_FULL_CACHING 0
#define IOMAP_NOCACHE_SER 1
#define IOMAP_NOCACHE_NONSER 2
#define IOMAP_NO_COPYBACK 3
/*
* Map some physical address range into the kernel address space.
*/
extern unsigned long kernel_map(unsigned long paddr, unsigned long size,
int nocacheflag, unsigned long *memavailp);
/*
* Set cache mode of (kernel space) address range.
*/
extern void kernel_set_cachemode(unsigned long address, unsigned long size,
unsigned int cmode);
/* Needs to be defined here and not in linux/mm.h, as it is arch dependent */
#define kern_addr_valid(addr) (1)
#define io_remap_page_range remap_page_range
/*
* No page table caches to initialise
*/
#define pgtable_cache_init() do { } while (0)
void do_page_fault(struct pt_regs *regs, unsigned long address,
unsigned long error_code);
void __init io_block_mapping(unsigned long virt, phys_addr_t phys,
unsigned int size, int flags);
void __init adjust_total_lowmem(void);
void mapin_ram(void);
int map_page(unsigned long va, phys_addr_t pa, int flags);
extern int mem_init_done;
extern unsigned long ioremap_base;
extern unsigned long ioremap_bot;
asmlinkage void __init mmu_init(void);
void __init *early_get_page(void);
void *consistent_alloc(int gfp, size_t size, dma_addr_t *dma_handle);
void consistent_free(void *vaddr);
void consistent_sync(void *vaddr, size_t size, int direction);
void consistent_sync_page(struct page *page, unsigned long offset,
size_t size, int direction);
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
#endif /* CONFIG_MMU */
#ifndef __ASSEMBLY__
#include <asm-generic/pgtable.h>
......
arch/microblaze/include/asm/sections.h
浏览文件 @ 15902bf6
/*
* Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2008-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
......@@ -14,6 +16,7 @@
# ifndef __ASSEMBLY__
extern char _ssbss[], _esbss[];
extern unsigned long __ivt_start[], __ivt_end[];
extern char _etext[], _stext[];
# ifdef CONFIG_MTD_UCLINUX
extern char *_ebss;
......
arch/microblaze/mm/pgtable.c 0 → 100644
浏览文件 @ 15902bf6
/*
* This file contains the routines setting up the linux page tables.
*
* Copyright (C) 2008 Michal Simek
* Copyright (C) 2008 PetaLogix
*
* Copyright (C) 2007 Xilinx, Inc. All rights reserved.
*
* Derived from arch/ppc/mm/pgtable.c:
* -- paulus
*
* Derived from arch/ppc/mm/init.c:
* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
*
* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
* and Cort Dougan (PReP) (cort@cs.nmt.edu)
* Copyright (C) 1996 Paul Mackerras
* Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
*
* Derived from "arch/i386/mm/init.c"
* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
*
* This file is subject to the terms and conditions of the GNU General
* Public License. See the file COPYING in the main directory of this
* archive for more details.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <linux/io.h>
#include <asm/mmu.h>
#include <asm/sections.h>
#define flush_HPTE(X, va, pg) _tlbie(va)
unsigned long ioremap_base;
unsigned long ioremap_bot;
/* The maximum lowmem defaults to 768Mb, but this can be configured to
* another value.
*/
#define MAX_LOW_MEM CONFIG_LOWMEM_SIZE
#ifndef CONFIG_SMP
struct pgtable_cache_struct quicklists;
#endif
static void __iomem *__ioremap(phys_addr_t addr, unsigned long size,
unsigned long flags)
{
unsigned long v, i;
phys_addr_t p;
int err;
/*
* Choose an address to map it to.
* Once the vmalloc system is running, we use it.
* Before then, we use space going down from ioremap_base
* (ioremap_bot records where we're up to).
*/
p = addr & PAGE_MASK;
size = PAGE_ALIGN(addr + size) - p;
/*
* Don't allow anybody to remap normal RAM that we're using.
* mem_init() sets high_memory so only do the check after that.
*
* However, allow remap of rootfs: TBD
*/
if (mem_init_done &&
p >= memory_start && p < virt_to_phys(high_memory) &&
!(p >= virt_to_phys((unsigned long)&__bss_stop) &&
p < virt_to_phys((unsigned long)__bss_stop))) {
printk(KERN_WARNING "__ioremap(): phys addr "PTE_FMT
" is RAM lr %p\n", (unsigned long)p,
__builtin_return_address(0));
return NULL;
}
if (size == 0)
return NULL;
/*
* Is it already mapped? If the whole area is mapped then we're
* done, otherwise remap it since we want to keep the virt addrs for
* each request contiguous.
*
* We make the assumption here that if the bottom and top
* of the range we want are mapped then it's mapped to the
* same virt address (and this is contiguous).
* -- Cort
*/
if (mem_init_done) {
struct vm_struct *area;
area = get_vm_area(size, VM_IOREMAP);
if (area == NULL)
return NULL;
v = VMALLOC_VMADDR(area->addr);
} else {
v = (ioremap_bot -= size);
}
if ((flags & _PAGE_PRESENT) == 0)
flags |= _PAGE_KERNEL;
if (flags & _PAGE_NO_CACHE)
flags |= _PAGE_GUARDED;
err = 0;
for (i = 0; i < size && err == 0; i += PAGE_SIZE)
err = map_page(v + i, p + i, flags);
if (err) {
if (mem_init_done)
vfree((void *)v);
return NULL;
}
return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
}
void __iomem *ioremap(phys_addr_t addr, unsigned long size)
{
return __ioremap(addr, size, _PAGE_NO_CACHE);
}
EXPORT_SYMBOL(ioremap);
void iounmap(void *addr)
{
if (addr > high_memory && (unsigned long) addr < ioremap_bot)
vfree((void *) (PAGE_MASK & (unsigned long) addr));
}
EXPORT_SYMBOL(iounmap);
int map_page(unsigned long va, phys_addr_t pa, int flags)
{
pmd_t *pd;
pte_t *pg;
int err = -ENOMEM;
/* spin_lock(&init_mm.page_table_lock); */
/* Use upper 10 bits of VA to index the first level map */
pd = pmd_offset(pgd_offset_k(va), va);
/* Use middle 10 bits of VA to index the second-level map */
pg = pte_alloc_kernel(pd, va); /* from powerpc - pgtable.c */
/* pg = pte_alloc_kernel(&init_mm, pd, va); */
if (pg != NULL) {
err = 0;
set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
__pgprot(flags)));
if (mem_init_done)
flush_HPTE(0, va, pmd_val(*pd));
/* flush_HPTE(0, va, pg); */
}
/* spin_unlock(&init_mm.page_table_lock); */
return err;
}
void __init adjust_total_lowmem(void)
{
/* TBD */
#if 0
unsigned long max_low_mem = MAX_LOW_MEM;
if (total_lowmem > max_low_mem) {
total_lowmem = max_low_mem;
#ifndef CONFIG_HIGHMEM
printk(KERN_INFO "Warning, memory limited to %ld Mb, use "
"CONFIG_HIGHMEM to reach %ld Mb\n",
max_low_mem >> 20, total_memory >> 20);
total_memory = total_lowmem;
#endif /* CONFIG_HIGHMEM */
}
#endif
}
static void show_tmem(unsigned long tmem)
{
volatile unsigned long a;
a = a + tmem;
}
/*
* Map in all of physical memory starting at CONFIG_KERNEL_START.
*/
void __init mapin_ram(void)
{
unsigned long v, p, s, f;
v = CONFIG_KERNEL_START;
p = memory_start;
show_tmem(memory_size);
for (s = 0; s < memory_size; s += PAGE_SIZE) {
f = _PAGE_PRESENT | _PAGE_ACCESSED |
_PAGE_SHARED | _PAGE_HWEXEC;
if ((char *) v < _stext || (char *) v >= _etext)
f |= _PAGE_WRENABLE;
else
/* On the MicroBlaze, no user access
forces R/W kernel access */
f |= _PAGE_USER;
map_page(v, p, f);
v += PAGE_SIZE;
p += PAGE_SIZE;
}
}
/* is x a power of 2? */
#define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0))
/*
* Set up a mapping for a block of I/O.
* virt, phys, size must all be page-aligned.
* This should only be called before ioremap is called.
*/
void __init io_block_mapping(unsigned long virt, phys_addr_t phys,
unsigned int size, int flags)
{
int i;
if (virt > CONFIG_KERNEL_START && virt < ioremap_bot)
ioremap_bot = ioremap_base = virt;
/* Put it in the page tables. */
for (i = 0; i < size; i += PAGE_SIZE)
map_page(virt + i, phys + i, flags);
}
/* Scan the real Linux page tables and return a PTE pointer for
* a virtual address in a context.
* Returns true (1) if PTE was found, zero otherwise. The pointer to
* the PTE pointer is unmodified if PTE is not found.
*/
static int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep)
{
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
int retval = 0;
pgd = pgd_offset(mm, addr & PAGE_MASK);
if (pgd) {
pmd = pmd_offset(pgd, addr & PAGE_MASK);
if (pmd_present(*pmd)) {
pte = pte_offset_kernel(pmd, addr & PAGE_MASK);
if (pte) {
retval = 1;
*ptep = pte;
}
}
}
return retval;
}
/* Find physical address for this virtual address. Normally used by
* I/O functions, but anyone can call it.
*/
unsigned long iopa(unsigned long addr)
{
unsigned long pa;
pte_t *pte;
struct mm_struct *mm;
/* Allow mapping of user addresses (within the thread)
* for DMA if necessary.
*/
if (addr < TASK_SIZE)
mm = current->mm;
else
mm = &init_mm;
pa = 0;
if (get_pteptr(mm, addr, &pte))
pa = (pte_val(*pte) & PAGE_MASK) | (addr & ~PAGE_MASK);
return pa;
}
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