diff options
Diffstat (limited to 'arch/sh/mm/cache-sh5.c')
| -rw-r--r-- | arch/sh/mm/cache-sh5.c | 307 |
1 files changed, 47 insertions, 260 deletions
diff --git a/arch/sh/mm/cache-sh5.c b/arch/sh/mm/cache-sh5.c index 86762092508..467ff8e260f 100644 --- a/arch/sh/mm/cache-sh5.c +++ b/arch/sh/mm/cache-sh5.c @@ -20,23 +20,11 @@ #include <asm/uaccess.h> #include <asm/mmu_context.h> +extern void __weak sh4__flush_region_init(void); + /* Wired TLB entry for the D-cache */ static unsigned long long dtlb_cache_slot; -void __init p3_cache_init(void) -{ - /* Reserve a slot for dcache colouring in the DTLB */ - dtlb_cache_slot = sh64_get_wired_dtlb_entry(); -} - -#ifdef CONFIG_DCACHE_DISABLED -#define sh64_dcache_purge_all() do { } while (0) -#define sh64_dcache_purge_coloured_phy_page(paddr, eaddr) do { } while (0) -#define sh64_dcache_purge_user_range(mm, start, end) do { } while (0) -#define sh64_dcache_purge_phy_page(paddr) do { } while (0) -#define sh64_dcache_purge_virt_page(mm, eaddr) do { } while (0) -#endif - /* * The following group of functions deal with mapping and unmapping a * temporary page into a DTLB slot that has been set aside for exclusive @@ -56,7 +44,6 @@ static inline void sh64_teardown_dtlb_cache_slot(void) local_irq_enable(); } -#ifndef CONFIG_ICACHE_DISABLED static inline void sh64_icache_inv_all(void) { unsigned long long addr, flag, data; @@ -214,52 +201,6 @@ static void sh64_icache_inv_user_page_range(struct mm_struct *mm, } } -/* - * Invalidate a small range of user context I-cache, not necessarily page - * (or even cache-line) aligned. - * - * Since this is used inside ptrace, the ASID in the mm context typically - * won't match current_asid. We'll have to switch ASID to do this. For - * safety, and given that the range will be small, do all this under cli. - * - * Note, there is a hazard that the ASID in mm->context is no longer - * actually associated with mm, i.e. if the mm->context has started a new - * cycle since mm was last active. However, this is just a performance - * issue: all that happens is that we invalidate lines belonging to - * another mm, so the owning process has to refill them when that mm goes - * live again. mm itself can't have any cache entries because there will - * have been a flush_cache_all when the new mm->context cycle started. - */ -static void sh64_icache_inv_user_small_range(struct mm_struct *mm, - unsigned long start, int len) -{ - unsigned long long eaddr = start; - unsigned long long eaddr_end = start + len; - unsigned long current_asid, mm_asid; - unsigned long flags; - unsigned long long epage_start; - - /* - * Align to start of cache line. Otherwise, suppose len==8 and - * start was at 32N+28 : the last 4 bytes wouldn't get invalidated. - */ - eaddr = L1_CACHE_ALIGN(start); - eaddr_end = start + len; - - mm_asid = cpu_asid(smp_processor_id(), mm); - local_irq_save(flags); - current_asid = switch_and_save_asid(mm_asid); - - epage_start = eaddr & PAGE_MASK; - - while (eaddr < eaddr_end) { - __asm__ __volatile__("icbi %0, 0" : : "r" (eaddr)); - eaddr += L1_CACHE_BYTES; - } - switch_and_save_asid(current_asid); - local_irq_restore(flags); -} - static void sh64_icache_inv_current_user_range(unsigned long start, unsigned long end) { /* The icbi instruction never raises ITLBMISS. i.e. if there's not a @@ -287,9 +228,7 @@ static void sh64_icache_inv_current_user_range(unsigned long start, unsigned lon addr += L1_CACHE_BYTES; } } -#endif /* !CONFIG_ICACHE_DISABLED */ -#ifndef CONFIG_DCACHE_DISABLED /* Buffer used as the target of alloco instructions to purge data from cache sets by natural eviction. -- RPC */ #define DUMMY_ALLOCO_AREA_SIZE ((L1_CACHE_BYTES << 10) + (1024 * 4)) @@ -541,59 +480,10 @@ static void sh64_dcache_purge_user_range(struct mm_struct *mm, } /* - * Purge the range of addresses from the D-cache. - * - * The addresses lie in the superpage mapping. There's no harm if we - * overpurge at either end - just a small performance loss. - */ -void __flush_purge_region(void *start, int size) -{ - unsigned long long ullend, addr, aligned_start; - - aligned_start = (unsigned long long)(signed long long)(signed long) start; - addr = L1_CACHE_ALIGN(aligned_start); - ullend = (unsigned long long) (signed long long) (signed long) start + size; - - while (addr <= ullend) { - __asm__ __volatile__ ("ocbp %0, 0" : : "r" (addr)); - addr += L1_CACHE_BYTES; - } -} - -void __flush_wback_region(void *start, int size) -{ - unsigned long long ullend, addr, aligned_start; - - aligned_start = (unsigned long long)(signed long long)(signed long) start; - addr = L1_CACHE_ALIGN(aligned_start); - ullend = (unsigned long long) (signed long long) (signed long) start + size; - - while (addr < ullend) { - __asm__ __volatile__ ("ocbwb %0, 0" : : "r" (addr)); - addr += L1_CACHE_BYTES; - } -} - -void __flush_invalidate_region(void *start, int size) -{ - unsigned long long ullend, addr, aligned_start; - - aligned_start = (unsigned long long)(signed long long)(signed long) start; - addr = L1_CACHE_ALIGN(aligned_start); - ullend = (unsigned long long) (signed long long) (signed long) start + size; - - while (addr < ullend) { - __asm__ __volatile__ ("ocbi %0, 0" : : "r" (addr)); - addr += L1_CACHE_BYTES; - } -} -#endif /* !CONFIG_DCACHE_DISABLED */ - -/* * Invalidate the entire contents of both caches, after writing back to * memory any dirty data from the D-cache. */ -void flush_cache_all(void) +static void sh5_flush_cache_all(void *unused) { sh64_dcache_purge_all(); sh64_icache_inv_all(); @@ -620,7 +510,7 @@ void flush_cache_all(void) * I-cache. This is similar to the lack of action needed in * flush_tlb_mm - see fault.c. */ -void flush_cache_mm(struct mm_struct *mm) +static void sh5_flush_cache_mm(void *unused) { sh64_dcache_purge_all(); } @@ -632,13 +522,18 @@ void flush_cache_mm(struct mm_struct *mm) * * Note, 'end' is 1 byte beyond the end of the range to flush. */ -void flush_cache_range(struct vm_area_struct *vma, unsigned long start, - unsigned long end) +static void sh5_flush_cache_range(void *args) { - struct mm_struct *mm = vma->vm_mm; + struct flusher_data *data = args; + struct vm_area_struct *vma; + unsigned long start, end; + + vma = data->vma; + start = data->addr1; + end = data->addr2; - sh64_dcache_purge_user_range(mm, start, end); - sh64_icache_inv_user_page_range(mm, start, end); + sh64_dcache_purge_user_range(vma->vm_mm, start, end); + sh64_icache_inv_user_page_range(vma->vm_mm, start, end); } /* @@ -650,16 +545,23 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start, * * Note, this is called with pte lock held. */ -void flush_cache_page(struct vm_area_struct *vma, unsigned long eaddr, - unsigned long pfn) +static void sh5_flush_cache_page(void *args) { + struct flusher_data *data = args; + struct vm_area_struct *vma; + unsigned long eaddr, pfn; + + vma = data->vma; + eaddr = data->addr1; + pfn = data->addr2; + sh64_dcache_purge_phy_page(pfn << PAGE_SHIFT); if (vma->vm_flags & VM_EXEC) sh64_icache_inv_user_page(vma, eaddr); } -void flush_dcache_page(struct page *page) +static void sh5_flush_dcache_page(void *page) { sh64_dcache_purge_phy_page(page_to_phys(page)); wmb(); @@ -673,162 +575,47 @@ void flush_dcache_page(struct page *page) * mapping, therefore it's guaranteed that there no cache entries for * the range in cache sets of the wrong colour. */ -void flush_icache_range(unsigned long start, unsigned long end) +static void sh5_flush_icache_range(void *args) { + struct flusher_data *data = args; + unsigned long start, end; + + start = data->addr1; + end = data->addr2; + __flush_purge_region((void *)start, end); wmb(); sh64_icache_inv_kernel_range(start, end); } /* - * Flush the range of user (defined by vma->vm_mm) address space starting - * at 'addr' for 'len' bytes from the cache. The range does not straddle - * a page boundary, the unique physical page containing the range is - * 'page'. This seems to be used mainly for invalidating an address - * range following a poke into the program text through the ptrace() call - * from another process (e.g. for BRK instruction insertion). - */ -void flush_icache_user_range(struct vm_area_struct *vma, - struct page *page, unsigned long addr, int len) -{ - - sh64_dcache_purge_coloured_phy_page(page_to_phys(page), addr); - mb(); - - if (vma->vm_flags & VM_EXEC) - sh64_icache_inv_user_small_range(vma->vm_mm, addr, len); -} - -/* * For the address range [start,end), write back the data from the * D-cache and invalidate the corresponding region of the I-cache for the * current process. Used to flush signal trampolines on the stack to * make them executable. */ -void flush_cache_sigtramp(unsigned long vaddr) +static void sh5_flush_cache_sigtramp(void *vaddr) { - unsigned long end = vaddr + L1_CACHE_BYTES; + unsigned long end = (unsigned long)vaddr + L1_CACHE_BYTES; - __flush_wback_region((void *)vaddr, L1_CACHE_BYTES); + __flush_wback_region(vaddr, L1_CACHE_BYTES); wmb(); - sh64_icache_inv_current_user_range(vaddr, end); + sh64_icache_inv_current_user_range((unsigned long)vaddr, end); } -#ifdef CONFIG_MMU -/* - * These *MUST* lie in an area of virtual address space that's otherwise - * unused. - */ -#define UNIQUE_EADDR_START 0xe0000000UL -#define UNIQUE_EADDR_END 0xe8000000UL - -/* - * Given a physical address paddr, and a user virtual address user_eaddr - * which will eventually be mapped to it, create a one-off kernel-private - * eaddr mapped to the same paddr. This is used for creating special - * destination pages for copy_user_page and clear_user_page. - */ -static unsigned long sh64_make_unique_eaddr(unsigned long user_eaddr, - unsigned long paddr) -{ - static unsigned long current_pointer = UNIQUE_EADDR_START; - unsigned long coloured_pointer; - - if (current_pointer == UNIQUE_EADDR_END) { - sh64_dcache_purge_all(); - current_pointer = UNIQUE_EADDR_START; - } - - coloured_pointer = (current_pointer & ~CACHE_OC_SYN_MASK) | - (user_eaddr & CACHE_OC_SYN_MASK); - sh64_setup_dtlb_cache_slot(coloured_pointer, get_asid(), paddr); - - current_pointer += (PAGE_SIZE << CACHE_OC_N_SYNBITS); - - return coloured_pointer; -} - -static void sh64_copy_user_page_coloured(void *to, void *from, - unsigned long address) +void __init sh5_cache_init(void) { - void *coloured_to; + local_flush_cache_all = sh5_flush_cache_all; + local_flush_cache_mm = sh5_flush_cache_mm; + local_flush_cache_dup_mm = sh5_flush_cache_mm; + local_flush_cache_page = sh5_flush_cache_page; + local_flush_cache_range = sh5_flush_cache_range; + local_flush_dcache_page = sh5_flush_dcache_page; + local_flush_icache_range = sh5_flush_icache_range; + local_flush_cache_sigtramp = sh5_flush_cache_sigtramp; - /* - * Discard any existing cache entries of the wrong colour. These are - * present quite often, if the kernel has recently used the page - * internally, then given it up, then it's been allocated to the user. - */ - sh64_dcache_purge_coloured_phy_page(__pa(to), (unsigned long)to); - - coloured_to = (void *)sh64_make_unique_eaddr(address, __pa(to)); - copy_page(from, coloured_to); - - sh64_teardown_dtlb_cache_slot(); -} - -static void sh64_clear_user_page_coloured(void *to, unsigned long address) -{ - void *coloured_to; - - /* - * Discard any existing kernel-originated lines of the wrong - * colour (as above) - */ - sh64_dcache_purge_coloured_phy_page(__pa(to), (unsigned long)to); - - coloured_to = (void *)sh64_make_unique_eaddr(address, __pa(to)); - clear_page(coloured_to); - - sh64_teardown_dtlb_cache_slot(); -} - -/* - * 'from' and 'to' are kernel virtual addresses (within the superpage - * mapping of the physical RAM). 'address' is the user virtual address - * where the copy 'to' will be mapped after. This allows a custom - * mapping to be used to ensure that the new copy is placed in the - * right cache sets for the user to see it without having to bounce it - * out via memory. Note however : the call to flush_page_to_ram in - * (generic)/mm/memory.c:(break_cow) undoes all this good work in that one - * very important case! - * - * TBD : can we guarantee that on every call, any cache entries for - * 'from' are in the same colour sets as 'address' also? i.e. is this - * always used just to deal with COW? (I suspect not). - * - * There are two possibilities here for when the page 'from' was last accessed: - * - by the kernel : this is OK, no purge required. - * - by the/a user (e.g. for break_COW) : need to purge. - * - * If the potential user mapping at 'address' is the same colour as - * 'from' there is no need to purge any cache lines from the 'from' - * page mapped into cache sets of colour 'address'. (The copy will be - * accessing the page through 'from'). - */ -void copy_user_page(void *to, void *from, unsigned long address, - struct page *page) -{ - if (((address ^ (unsigned long) from) & CACHE_OC_SYN_MASK) != 0) - sh64_dcache_purge_coloured_phy_page(__pa(from), address); - - if (((address ^ (unsigned long) to) & CACHE_OC_SYN_MASK) == 0) - copy_page(to, from); - else - sh64_copy_user_page_coloured(to, from, address); -} + /* Reserve a slot for dcache colouring in the DTLB */ + dtlb_cache_slot = sh64_get_wired_dtlb_entry(); -/* - * 'to' is a kernel virtual address (within the superpage mapping of the - * physical RAM). 'address' is the user virtual address where the 'to' - * page will be mapped after. This allows a custom mapping to be used to - * ensure that the new copy is placed in the right cache sets for the - * user to see it without having to bounce it out via memory. - */ -void clear_user_page(void *to, unsigned long address, struct page *page) -{ - if (((address ^ (unsigned long) to) & CACHE_OC_SYN_MASK) == 0) - clear_page(to); - else - sh64_clear_user_page_coloured(to, address); + sh4__flush_region_init(); } -#endif |