sh: Fix up the SH-5 build with caches enabled.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 21 insertions, 228 deletions

diff --git a/arch/sh/mm/cache-sh5.c b/arch/sh/mm/cache-sh5.c
index a8f5142dc2cf..819e0f9e8dba 100644
--- a/arch/sh/mm/cache-sh5.c
+++ b/arch/sh/mm/cache-sh5.c
@@ -25,29 +25,6 @@ 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();
-
-        sh4__flush_region_init();
-}
-
-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)
@@ -233,52 +210,6 @@ 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
@@ -564,7 +495,7 @@ static void sh64_dcache_purge_user_range(struct mm_struct *mm,
  * 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();
@@ -591,7 +522,7 @@ 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(struct mm_struct *mm)
 {
         sh64_dcache_purge_all();
 }
@@ -603,8 +534,8 @@ 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(struct vm_area_struct *vma,
+                unsigned long start, unsigned long end)
 {
         struct mm_struct *mm = vma->vm_mm;
 
@@ -621,8 +552,8 @@ 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(struct vm_area_struct *vma,
+                unsigned long eaddr, unsigned long pfn)
 {
         sh64_dcache_purge_phy_page(pfn << PAGE_SHIFT);
 
@@ -630,7 +561,7 @@ void flush_cache_page(struct vm_area_struct *vma, unsigned long eaddr,
                 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();
@@ -644,7 +575,7 @@ 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(unsigned long start, unsigned long end)
 {
         __flush_purge_region((void *)start, end);
         wmb();
@@ -652,31 +583,12 @@ void flush_icache_range(unsigned long start, unsigned long 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;
 
@@ -685,138 +597,19 @@ void flush_cache_sigtramp(unsigned long vaddr)
         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 *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);
-
-        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)
+void __init sh5_cache_init(void)
 {
-        if (((address ^ (unsigned long) from) & CACHE_OC_SYN_MASK) != 0)
-                sh64_dcache_purge_coloured_phy_page(__pa(from), address);
+        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;
 
-        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