#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 cpu_cache_init(void)
-{
- /* Reserve a slot for dcache colouring in the DTLB */
- dtlb_cache_slot = sh64_get_wired_dtlb_entry();
-}
-
-void __init kmap_coherent_init(void)
-{
- /* XXX ... */
-}
-
-void *kmap_coherent(struct page *page, unsigned long addr)
-{
- /* XXX ... */
- return NULL;
-}
-
-void kunmap_coherent(void)
-{
-}
-
-#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
local_irq_enable();
}
-#ifndef CONFIG_ICACHE_DISABLED
static inline void sh64_icache_inv_all(void)
{
unsigned long long addr, flag, data;
}
}
-/*
- * 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
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))
sh64_dcache_purge_user_pages(mm, start, end);
}
}
-#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)
{
sh64_dcache_purge_all();
sh64_icache_inv_all();
* 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(struct mm_struct *mm)
{
sh64_dcache_purge_all();
}
*
* 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(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
{
struct mm_struct *mm = vma->vm_mm;
*
* 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(struct vm_area_struct *vma,
+ unsigned long eaddr, unsigned long pfn)
{
sh64_dcache_purge_phy_page(pfn << PAGE_SHIFT);
sh64_icache_inv_user_page(vma, eaddr);
}
-void flush_dcache_page(struct page *page)
+static void sh5_flush_dcache_page(struct page *page)
{
sh64_dcache_purge_phy_page(page_to_phys(page));
wmb();
* 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(unsigned long start, unsigned long end)
{
__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).
- */
-static 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(unsigned long vaddr)
{
unsigned long end = vaddr + L1_CACHE_BYTES;
sh64_icache_inv_current_user_range(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;
-
- /*
- * 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);
+ flush_cache_all = sh5_flush_cache_all;
+ flush_cache_mm = sh5_flush_cache_mm;
+ flush_cache_dup_mm = sh5_flush_cache_mm;
+ flush_cache_page = sh5_flush_cache_page;
+ flush_cache_range = sh5_flush_cache_range;
+ flush_dcache_page = sh5_flush_dcache_page;
+ flush_icache_range = sh5_flush_icache_range;
+ flush_cache_sigtramp = sh5_flush_cache_sigtramp;
- 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);
-}
-
-/*
- * '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);
-}
-
-void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
- unsigned long vaddr, void *dst, const void *src,
- unsigned long len)
-{
- flush_cache_page(vma, vaddr, page_to_pfn(page));
- memcpy(dst, src, len);
- flush_icache_user_range(vma, page, vaddr, len);
-}
+ /* Reserve a slot for dcache colouring in the DTLB */
+ dtlb_cache_slot = sh64_get_wired_dtlb_entry();
-void copy_from_user_page(struct vm_area_struct *vma, struct page *page,
- unsigned long vaddr, void *dst, const void *src,
- unsigned long len)
-{
- flush_cache_page(vma, vaddr, page_to_pfn(page));
- memcpy(dst, src, len);
+ sh4__flush_region_init();
}
-#endif
git.openpandora.org / pandora-kernel.git / blobdiff