/* * ARC700 VIPT Cache Management * * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * vineetg: May 2011: for Non-aliasing VIPT D-cache following can be NOPs * -flush_cache_dup_mm (fork) * -likewise for flush_cache_mm (exit/execve) * -likewise for flush_cache_range,flush_cache_page (munmap, exit, COW-break) * * vineetg: Apr 2011 * -Now that MMU can support larger pg sz (16K), the determiniation of * aliasing shd not be based on assumption of 8k pg * * vineetg: Mar 2011 * -optimised version of flush_icache_range( ) for making I/D coherent * when vaddr is available (agnostic of num of aliases) * * vineetg: Mar 2011 * -Added documentation about I-cache aliasing on ARC700 and the way it * was handled up until MMU V2. * -Spotted a three year old bug when killing the 4 aliases, which needs * bottom 2 bits, so we need to do paddr | {0x00, 0x01, 0x02, 0x03} * instead of paddr | {0x00, 0x01, 0x10, 0x11} * (Rajesh you owe me one now) * * vineetg: Dec 2010 * -Off-by-one error when computing num_of_lines to flush * This broke signal handling with bionic which uses synthetic sigret stub * * vineetg: Mar 2010 * -GCC can't generate ZOL for core cache flush loops. * Conv them into iterations based as opposed to while (start < end) types * * Vineetg: July 2009 * -In I-cache flush routine we used to chk for aliasing for every line INV. * Instead now we setup routines per cache geometry and invoke them * via function pointers. * * Vineetg: Jan 2009 * -Cache Line flush routines used to flush an extra line beyond end addr * because check was while (end >= start) instead of (end > start) * =Some call sites had to work around by doing -1, -4 etc to end param * =Some callers didnt care. This was spec bad in case of INV routines * which would discard valid data (cause of the horrible ext2 bug * in ARC IDE driver) * * vineetg: June 11th 2008: Fixed flush_icache_range( ) * -Since ARC700 caches are not coherent (I$ doesnt snoop D$) both need * to be flushed, which it was not doing. * -load_module( ) passes vmalloc addr (Kernel Virtual Addr) to the API, * however ARC cache maintenance OPs require PHY addr. Thus need to do * vmalloc_to_phy. * -Also added optimisation there, that for range > PAGE SIZE we flush the * entire cache in one shot rather than line by line. For e.g. a module * with Code sz 600k, old code flushed 600k worth of cache (line-by-line), * while cache is only 16 or 32k. */ #include #include #include #include #include #include #include #include #include #include #ifdef CONFIG_ARC_HAS_ICACHE static void __ic_line_inv_no_alias(unsigned long, int); static void __ic_line_inv_2_alias(unsigned long, int); static void __ic_line_inv_4_alias(unsigned long, int); /* Holds the ptr to flush routine, dependign on size due to aliasing issues */ static void (*___flush_icache_rtn) (unsigned long, int); #endif char *arc_cache_mumbojumbo(int cpu_id, char *buf, int len) { int n = 0; unsigned int c = smp_processor_id(); #define PR_CACHE(p, enb, str) \ { \ if (!(p)->ver) \ n += scnprintf(buf + n, len - n, str"\t\t: N/A\n"); \ else \ n += scnprintf(buf + n, len - n, \ str"\t\t: (%uK) VIPT, %dway set-asc, %ub Line %s\n", \ TO_KB((p)->sz), (p)->assoc, (p)->line_len, \ enb ? "" : "DISABLED (kernel-build)"); \ } PR_CACHE(&cpuinfo_arc700[c].icache, __CONFIG_ARC_HAS_ICACHE, "I-Cache"); PR_CACHE(&cpuinfo_arc700[c].dcache, __CONFIG_ARC_HAS_DCACHE, "D-Cache"); return buf; } /* * Read the Cache Build Confuration Registers, Decode them and save into * the cpuinfo structure for later use. * No Validation done here, simply read/convert the BCRs */ void __init read_decode_cache_bcr(void) { struct bcr_cache ibcr, dbcr; struct cpuinfo_arc_cache *p_ic, *p_dc; unsigned int cpu = smp_processor_id(); p_ic = &cpuinfo_arc700[cpu].icache; READ_BCR(ARC_REG_IC_BCR, ibcr); if (ibcr.config == 0x3) p_ic->assoc = 2; p_ic->line_len = 8 << ibcr.line_len; p_ic->sz = 0x200 << ibcr.sz; p_ic->ver = ibcr.ver; p_dc = &cpuinfo_arc700[cpu].dcache; READ_BCR(ARC_REG_DC_BCR, dbcr); if (dbcr.config == 0x2) p_dc->assoc = 4; p_dc->line_len = 16 << dbcr.line_len; p_dc->sz = 0x200 << dbcr.sz; p_dc->ver = dbcr.ver; } /* * 1. Validate the Cache Geomtery (compile time config matches hardware) * 2. If I-cache suffers from aliasing, setup work arounds (difft flush rtn) * (aliasing D-cache configurations are not supported YET) * 3. Enable the Caches, setup default flush mode for D-Cache * 3. Calculate the SHMLBA used by user space */ void __init arc_cache_init(void) { unsigned int temp; #ifdef CONFIG_ARC_CACHE unsigned int cpu = smp_processor_id(); #endif #ifdef CONFIG_ARC_HAS_ICACHE struct cpuinfo_arc_cache *ic; #endif #ifdef CONFIG_ARC_HAS_DCACHE struct cpuinfo_arc_cache *dc; #endif int way_pg_ratio = way_pg_ratio; char str[256]; printk(arc_cache_mumbojumbo(0, str, sizeof(str))); #ifdef CONFIG_ARC_HAS_ICACHE ic = &cpuinfo_arc700[cpu].icache; /* 1. Confirm some of I-cache params which Linux assumes */ if ((ic->assoc != ARC_ICACHE_WAYS) || (ic->line_len != ARC_ICACHE_LINE_LEN)) { panic("Cache H/W doesn't match kernel Config"); } #if (CONFIG_ARC_MMU_VER > 2) if (ic->ver != 3) { if (running_on_hw) panic("Cache ver doesn't match MMU ver\n"); /* For ISS - suggest the toggles to use */ pr_err("Use -prop=icache_version=3,-prop=dcache_version=3\n"); } #endif /* * if Cache way size is <= page size then no aliasing exhibited * otherwise ratio determines num of aliases. * e.g. 32K I$, 2 way set assoc, 8k pg size * way-sz = 32k/2 = 16k * way-pg-ratio = 16k/8k = 2, so 2 aliases possible * (meaning 1 line could be in 2 possible locations). */ way_pg_ratio = ic->sz / ARC_ICACHE_WAYS / PAGE_SIZE; switch (way_pg_ratio) { case 0: case 1: ___flush_icache_rtn = __ic_line_inv_no_alias; break; case 2: ___flush_icache_rtn = __ic_line_inv_2_alias; break; case 4: ___flush_icache_rtn = __ic_line_inv_4_alias; break; default: panic("Unsupported I-Cache Sz\n"); } #endif /* Enable/disable I-Cache */ temp = read_aux_reg(ARC_REG_IC_CTRL); #ifdef CONFIG_ARC_HAS_ICACHE temp &= ~IC_CTRL_CACHE_DISABLE; #else temp |= IC_CTRL_CACHE_DISABLE; #endif write_aux_reg(ARC_REG_IC_CTRL, temp); #ifdef CONFIG_ARC_HAS_DCACHE dc = &cpuinfo_arc700[cpu].dcache; if ((dc->assoc != ARC_DCACHE_WAYS) || (dc->line_len != ARC_DCACHE_LINE_LEN)) { panic("Cache H/W doesn't match kernel Config"); } /* check for D-Cache aliasing */ if ((dc->sz / ARC_DCACHE_WAYS) > PAGE_SIZE) panic("D$ aliasing not handled right now\n"); #endif /* Set the default Invalidate Mode to "simpy discard dirty lines" * as this is more frequent then flush before invalidate * Ofcourse we toggle this default behviour when desired */ temp = read_aux_reg(ARC_REG_DC_CTRL); temp &= ~DC_CTRL_INV_MODE_FLUSH; #ifdef CONFIG_ARC_HAS_DCACHE /* Enable D-Cache: Clear Bit 0 */ write_aux_reg(ARC_REG_DC_CTRL, temp & ~IC_CTRL_CACHE_DISABLE); #else /* Flush D cache */ write_aux_reg(ARC_REG_DC_FLSH, 0x1); /* Disable D cache */ write_aux_reg(ARC_REG_DC_CTRL, temp | IC_CTRL_CACHE_DISABLE); #endif return; } #define OP_INV 0x1 #define OP_FLUSH 0x2 #define OP_FLUSH_N_INV 0x3 #ifdef CONFIG_ARC_HAS_DCACHE /*************************************************************** * Machine specific helpers for Entire D-Cache or Per Line ops */ static inline void wait_for_flush(void) { while (read_aux_reg(ARC_REG_DC_CTRL) & DC_CTRL_FLUSH_STATUS) ; } /* * Operation on Entire D-Cache * @cacheop = {OP_INV, OP_FLUSH, OP_FLUSH_N_INV} * Note that constant propagation ensures all the checks are gone * in generated code */ static inline void __dc_entire_op(const int cacheop) { unsigned long flags, tmp = tmp; int aux; local_irq_save(flags); if (cacheop == OP_FLUSH_N_INV) { /* Dcache provides 2 cmd: FLUSH or INV * INV inturn has sub-modes: DISCARD or FLUSH-BEFORE * flush-n-inv is achieved by INV cmd but with IM=1 * Default INV sub-mode is DISCARD, which needs to be toggled */ tmp = read_aux_reg(ARC_REG_DC_CTRL); write_aux_reg(ARC_REG_DC_CTRL, tmp | DC_CTRL_INV_MODE_FLUSH); } if (cacheop & OP_INV) /* Inv or flush-n-inv use same cmd reg */ aux = ARC_REG_DC_IVDC; else aux = ARC_REG_DC_FLSH; write_aux_reg(aux, 0x1); if (cacheop & OP_FLUSH) /* flush / flush-n-inv both wait */ wait_for_flush(); /* Switch back the DISCARD ONLY Invalidate mode */ if (cacheop == OP_FLUSH_N_INV) write_aux_reg(ARC_REG_DC_CTRL, tmp & ~DC_CTRL_INV_MODE_FLUSH); local_irq_restore(flags); } /* * Per Line Operation on D-Cache * Doesn't deal with type-of-op/IRQ-disabling/waiting-for-flush-to-complete * It's sole purpose is to help gcc generate ZOL */ static inline void __dc_line_loop(unsigned long start, unsigned long sz, int aux_reg) { int num_lines, slack; /* Ensure we properly floor/ceil the non-line aligned/sized requests * and have @start - aligned to cache line and integral @num_lines. * This however can be avoided for page sized since: * -@start will be cache-line aligned already (being page aligned) * -@sz will be integral multiple of line size (being page sized). */ if (!(__builtin_constant_p(sz) && sz == PAGE_SIZE)) { slack = start & ~DCACHE_LINE_MASK; sz += slack; start -= slack; } num_lines = DIV_ROUND_UP(sz, ARC_DCACHE_LINE_LEN); while (num_lines-- > 0) { #if (CONFIG_ARC_MMU_VER > 2) /* * Just as for I$, in MMU v3, D$ ops also require * "tag" bits in DC_PTAG, "index" bits in FLDL,IVDL ops * But we pass phy addr for both. This works since Linux * doesn't support aliasing configs for D$, yet. * Thus paddr is enough to provide both tag and index. */ write_aux_reg(ARC_REG_DC_PTAG, start); #endif write_aux_reg(aux_reg, start); start += ARC_DCACHE_LINE_LEN; } } /* * D-Cache : Per Line INV (discard or wback+discard) or FLUSH (wback) */ static inline void __dc_line_op(unsigned long start, unsigned long sz, const int cacheop) { unsigned long flags, tmp = tmp; int aux; local_irq_save(flags); if (cacheop == OP_FLUSH_N_INV) { /* * Dcache provides 2 cmd: FLUSH or INV * INV inturn has sub-modes: DISCARD or FLUSH-BEFORE * flush-n-inv is achieved by INV cmd but with IM=1 * Default INV sub-mode is DISCARD, which needs to be toggled */ tmp = read_aux_reg(ARC_REG_DC_CTRL); write_aux_reg(ARC_REG_DC_CTRL, tmp | DC_CTRL_INV_MODE_FLUSH); } if (cacheop & OP_INV) /* Inv / flush-n-inv use same cmd reg */ aux = ARC_REG_DC_IVDL; else aux = ARC_REG_DC_FLDL; __dc_line_loop(start, sz, aux); if (cacheop & OP_FLUSH) /* flush / flush-n-inv both wait */ wait_for_flush(); /* Switch back the DISCARD ONLY Invalidate mode */ if (cacheop == OP_FLUSH_N_INV) write_aux_reg(ARC_REG_DC_CTRL, tmp & ~DC_CTRL_INV_MODE_FLUSH); local_irq_restore(flags); } #else #define __dc_entire_op(cacheop) #define __dc_line_op(start, sz, cacheop) #endif /* CONFIG_ARC_HAS_DCACHE */ #ifdef CONFIG_ARC_HAS_ICACHE /* * I-Cache Aliasing in ARC700 VIPT caches * * For fetching code from I$, ARC700 uses vaddr (embedded in program code) * to "index" into SET of cache-line and paddr from MMU to match the TAG * in the WAYS of SET. * * However the CDU iterface (to flush/inv) lines from software, only takes * paddr (to have simpler hardware interface). For simpler cases, using paddr * alone suffices. * e.g. 2-way-set-assoc, 16K I$ (8k MMU pg sz, 32b cache line size): * way_sz = cache_sz / num_ways = 16k/2 = 8k * num_sets = way_sz / line_sz = 8k/32 = 256 => 8 bits * Ignoring the bottom 5 bits corresp to the off within a 32b cacheline, * bits req for calc set-index = bits 12:5 (0 based). Since this range fits * inside the bottom 13 bits of paddr, which are same for vaddr and paddr * (with 8k pg sz), paddr alone can be safely used by CDU to unambigously * locate a cache-line. * * However for a difft sized cache, say 32k I$, above math yields need * for 14 bits of vaddr to locate a cache line, which can't be provided by * paddr, since the bit 13 (0 based) might differ between the two. * * This lack of extra bits needed for correct line addressing, defines the * classical problem of Cache aliasing with VIPT architectures * num_aliases = 1 << extra_bits * e.g. 2-way-set-assoc, 32K I$ with 8k MMU pg sz => 2 aliases * 2-way-set-assoc, 64K I$ with 8k MMU pg sz => 4 aliases * 2-way-set-assoc, 16K I$ with 8k MMU pg sz => NO aliases * * ------------------ * MMU v1/v2 (Fixed Page Size 8k) * ------------------ * The solution was to provide CDU with these additonal vaddr bits. These * would be bits [x:13], x would depend on cache-geom. * H/w folks chose [17:13] to be a future safe range, and moreso these 5 bits * of vaddr could easily be "stuffed" in the paddr as bits [4:0] since the * orig 5 bits of paddr were anyways ignored by CDU line ops, as they * represent the offset within cache-line. The adv of using this "clumsy" * interface for additional info was no new reg was needed in CDU. * * 17:13 represented the max num of bits passable, actual bits needed were * fewer, based on the num-of-aliases possible. * -for 2 alias possibility, only bit 13 needed (32K cache) * -for 4 alias possibility, bits 14:13 needed (64K cache) * * Since vaddr was not available for all instances of I$ flush req by core * kernel, the only safe way (non-optimal though) was to kill all possible * lines which could represent an alias (even if they didnt represent one * in execution). * e.g. for 64K I$, 4 aliases possible, so we did * flush start * flush start | 0x01 * flush start | 0x2 * flush start | 0x3 * * The penalty was invoking the operation itself, since tag match is anyways * paddr based, a line which didn't represent an alias would not match the * paddr, hence wont be killed * * Note that aliasing concerns are independent of line-sz for a given cache * geometry (size + set_assoc) because the extra bits required by line-sz are * reduced from the set calc. * e.g. 2-way-set-assoc, 32K I$ with 8k MMU pg sz and using math above * 32b line-sz: 9 bits set-index-calc, 5 bits offset-in-line => 1 extra bit * 64b line-sz: 8 bits set-index-calc, 6 bits offset-in-line => 1 extra bit * * ------------------ * MMU v3 * ------------------ * This ver of MMU supports var page sizes (1k-16k) - Linux will support * 8k (default), 16k and 4k. * However from hardware perspective, smaller page sizes aggrevate aliasing * meaning more vaddr bits needed to disambiguate the cache-line-op ; * the existing scheme of piggybacking won't work for certain configurations. * Two new registers IC_PTAG and DC_PTAG inttoduced. * "tag" bits are provided in PTAG, index bits in existing IVIL/IVDL/FLDL regs */ /*********************************************************** * Machine specific helpers for per line I-Cache invalidate. * 3 routines to accpunt for 1, 2, 4 aliases possible */ static void __ic_line_inv_no_alias(unsigned long start, int num_lines) { while (num_lines-- > 0) { #if (CONFIG_ARC_MMU_VER > 2) write_aux_reg(ARC_REG_IC_PTAG, start); #endif write_aux_reg(ARC_REG_IC_IVIL, start); start += ARC_ICACHE_LINE_LEN; } } static void __ic_line_inv_2_alias(unsigned long start, int num_lines) { while (num_lines-- > 0) { #if (CONFIG_ARC_MMU_VER > 2) /* * MMU v3, CDU prog model (for line ops) now uses a new IC_PTAG * reg to pass the "tag" bits and existing IVIL reg only looks * at bits relevant for "index" (details above) * Programming Notes: * -when writing tag to PTAG reg, bit chopping can be avoided, * CDU ignores non-tag bits. * -Ideally "index" must be computed from vaddr, but it is not * avail in these rtns. So to be safe, we kill the lines in all * possible indexes corresp to num of aliases possible for * given cache config. */ write_aux_reg(ARC_REG_IC_PTAG, start); write_aux_reg(ARC_REG_IC_IVIL, start & ~(0x1 << PAGE_SHIFT)); write_aux_reg(ARC_REG_IC_IVIL, start | (0x1 << PAGE_SHIFT)); #else write_aux_reg(ARC_REG_IC_IVIL, start); write_aux_reg(ARC_REG_IC_IVIL, start | 0x01); #endif start += ARC_ICACHE_LINE_LEN; } } static void __ic_line_inv_4_alias(unsigned long start, int num_lines) { while (num_lines-- > 0) { #if (CONFIG_ARC_MMU_VER > 2) write_aux_reg(ARC_REG_IC_PTAG, start); write_aux_reg(ARC_REG_IC_IVIL, start & ~(0x3 << PAGE_SHIFT)); write_aux_reg(ARC_REG_IC_IVIL, start & ~(0x2 << PAGE_SHIFT)); write_aux_reg(ARC_REG_IC_IVIL, start & ~(0x1 << PAGE_SHIFT)); write_aux_reg(ARC_REG_IC_IVIL, start | (0x3 << PAGE_SHIFT)); #else write_aux_reg(ARC_REG_IC_IVIL, start); write_aux_reg(ARC_REG_IC_IVIL, start | 0x01); write_aux_reg(ARC_REG_IC_IVIL, start | 0x02); write_aux_reg(ARC_REG_IC_IVIL, start | 0x03); #endif start += ARC_ICACHE_LINE_LEN; } } static void __ic_line_inv(unsigned long start, unsigned long sz) { unsigned long flags; int num_lines, slack; /* * Ensure we properly floor/ceil the non-line aligned/sized requests * and have @start - aligned to cache line, and integral @num_lines * However page sized flushes can be compile time optimised. * -@start will be cache-line aligned already (being page aligned) * -@sz will be integral multiple of line size (being page sized). */ if (!(__builtin_constant_p(sz) && sz == PAGE_SIZE)) { slack = start & ~ICACHE_LINE_MASK; sz += slack; start -= slack; } num_lines = DIV_ROUND_UP(sz, ARC_ICACHE_LINE_LEN); local_irq_save(flags); (*___flush_icache_rtn) (start, num_lines); local_irq_restore(flags); } /* Unlike routines above, having vaddr for flush op (along with paddr), * prevents the need to speculatively kill the lines in multiple sets * based on ratio of way_sz : pg_sz */ static void __ic_line_inv_vaddr(unsigned long phy_start, unsigned long vaddr, unsigned long sz) { unsigned long flags; int num_lines, slack; unsigned int addr; slack = phy_start & ~ICACHE_LINE_MASK; sz += slack; phy_start -= slack; num_lines = DIV_ROUND_UP(sz, ARC_ICACHE_LINE_LEN); #if (CONFIG_ARC_MMU_VER > 2) vaddr &= ~ICACHE_LINE_MASK; addr = phy_start; #else /* bits 17:13 of vaddr go as bits 4:0 of paddr */ addr = phy_start | ((vaddr >> 13) & 0x1F); #endif local_irq_save(flags); while (num_lines-- > 0) { #if (CONFIG_ARC_MMU_VER > 2) /* tag comes from phy addr */ write_aux_reg(ARC_REG_IC_PTAG, addr); /* index bits come from vaddr */ write_aux_reg(ARC_REG_IC_IVIL, vaddr); vaddr += ARC_ICACHE_LINE_LEN; #else /* this paddr contains vaddrs bits as needed */ write_aux_reg(ARC_REG_IC_IVIL, addr); #endif addr += ARC_ICACHE_LINE_LEN; } local_irq_restore(flags); } #else #define __ic_line_inv(start, sz) #define __ic_line_inv_vaddr(pstart, vstart, sz) #endif /* CONFIG_ARC_HAS_ICACHE */ /*********************************************************** * Exported APIs */ /* TBD: use pg_arch_1 to optimize this */ void flush_dcache_page(struct page *page) { __dc_line_op((unsigned long)page_address(page), PAGE_SIZE, OP_FLUSH); } EXPORT_SYMBOL(flush_dcache_page); void dma_cache_wback_inv(unsigned long start, unsigned long sz) { __dc_line_op(start, sz, OP_FLUSH_N_INV); } EXPORT_SYMBOL(dma_cache_wback_inv); void dma_cache_inv(unsigned long start, unsigned long sz) { __dc_line_op(start, sz, OP_INV); } EXPORT_SYMBOL(dma_cache_inv); void dma_cache_wback(unsigned long start, unsigned long sz) { __dc_line_op(start, sz, OP_FLUSH); } EXPORT_SYMBOL(dma_cache_wback); /* * This is API for making I/D Caches consistent when modifying code * (loadable modules, kprobes, etc) * This is called on insmod, with kernel virtual address for CODE of * the module. ARC cache maintenance ops require PHY address thus we * need to convert vmalloc addr to PHY addr */ void flush_icache_range(unsigned long kstart, unsigned long kend) { unsigned int tot_sz, off, sz; unsigned long phy, pfn; unsigned long flags; /* printk("Kernel Cache Cohenercy: %lx to %lx\n",kstart, kend); */ /* This is not the right API for user virtual address */ if (kstart < TASK_SIZE) { BUG_ON("Flush icache range for user virtual addr space"); return; } /* Shortcut for bigger flush ranges. * Here we don't care if this was kernel virtual or phy addr */ tot_sz = kend - kstart; if (tot_sz > PAGE_SIZE) { flush_cache_all(); return; } /* Case: Kernel Phy addr (0x8000_0000 onwards) */ if (likely(kstart > PAGE_OFFSET)) { __ic_line_inv(kstart, kend - kstart); __dc_line_op(kstart, kend - kstart, OP_FLUSH); return; } /* * Case: Kernel Vaddr (0x7000_0000 to 0x7fff_ffff) * (1) ARC Cache Maintenance ops only take Phy addr, hence special * handling of kernel vaddr. * * (2) Despite @tot_sz being < PAGE_SIZE (bigger cases handled already), * it still needs to handle a 2 page scenario, where the range * straddles across 2 virtual pages and hence need for loop */ while (tot_sz > 0) { off = kstart % PAGE_SIZE; pfn = vmalloc_to_pfn((void *)kstart); phy = (pfn << PAGE_SHIFT) + off; sz = min_t(unsigned int, tot_sz, PAGE_SIZE - off); local_irq_save(flags); __dc_line_op(phy, sz, OP_FLUSH); __ic_line_inv(phy, sz); local_irq_restore(flags); kstart += sz; tot_sz -= sz; } } /* * Optimised ver of flush_icache_range() with spec callers: ptrace/signals * where vaddr is also available. This allows passing both vaddr and paddr * bits to CDU for cache flush, short-circuting the current pessimistic algo * which kills all possible aliases. * An added adv of knowing that vaddr is user-vaddr avoids various checks * and handling for k-vaddr, k-paddr as done in orig ver above */ void flush_icache_range_vaddr(unsigned long paddr, unsigned long u_vaddr, int len) { __ic_line_inv_vaddr(paddr, u_vaddr, len); __dc_line_op(paddr, len, OP_FLUSH); } /* * XXX: This also needs to be optim using pg_arch_1 * This is called when a page-cache page is about to be mapped into a * user process' address space. It offers an opportunity for a * port to ensure d-cache/i-cache coherency if necessary. */ void flush_icache_page(struct vm_area_struct *vma, struct page *page) { if (!(vma->vm_flags & VM_EXEC)) return; __ic_line_inv((unsigned long)page_address(page), PAGE_SIZE); } void flush_icache_all(void) { unsigned long flags; local_irq_save(flags); write_aux_reg(ARC_REG_IC_IVIC, 1); /* lr will not complete till the icache inv operation is not over */ read_aux_reg(ARC_REG_IC_CTRL); local_irq_restore(flags); } noinline void flush_cache_all(void) { unsigned long flags; local_irq_save(flags); flush_icache_all(); __dc_entire_op(OP_FLUSH_N_INV); local_irq_restore(flags); } /********************************************************************** * Explicit Cache flush request from user space via syscall * Needed for JITs which generate code on the fly */ SYSCALL_DEFINE3(cacheflush, uint32_t, start, uint32_t, sz, uint32_t, flags) { /* TBD: optimize this */ flush_cache_all(); return 0; }