sh: Revert lazy dcache writeback changes.

[pandora-kernel.git] / arch / sh / mm / tlb-sh4.c

diff --git a/arch/sh/mm/tlb-sh4.c b/arch/sh/mm/tlb-sh4.c
index 221e709..f74cf66 100644 (file)
--- a/arch/sh/mm/tlb-sh4.c
+++ b/arch/sh/mm/tlb-sh4.c
@@ -8,9 +8,74 @@
  *
  * Released under the terms of the GNU GPL v2.0.
  */
-#include <linux/io.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/interrupt.h>
+
 #include <asm/system.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
 #include <asm/mmu_context.h>
+#include <asm/cacheflush.h>
+
+void update_mmu_cache(struct vm_area_struct * vma,
+                     unsigned long address, pte_t pte)
+{
+       unsigned long flags;
+       unsigned long pteval;
+       unsigned long vpn;
+       struct page *page;
+       unsigned long pfn;
+
+       /* Ptrace may call this routine. */
+       if (vma && current->active_mm != vma->vm_mm)
+               return;
+
+       pfn = pte_pfn(pte);
+       if (pfn_valid(pfn)) {
+               page = pfn_to_page(pfn);
+               if (!test_bit(PG_mapped, &page->flags)) {
+                       unsigned long phys = pte_val(pte) & PTE_PHYS_MASK;
+                       __flush_wback_region((void *)P1SEGADDR(phys), PAGE_SIZE);
+                       __set_bit(PG_mapped, &page->flags);
+               }
+       }
+
+       local_irq_save(flags);
+
+       /* Set PTEH register */
+       vpn = (address & MMU_VPN_MASK) | get_asid();
+       ctrl_outl(vpn, MMU_PTEH);
+
+       pteval = pte_val(pte);
+
+       /* Set PTEA register */
+       if (cpu_data->flags & CPU_HAS_PTEA)
+               /* TODO: make this look less hacky */
+               ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA);
+
+       /* Set PTEL register */
+       pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
+#ifdef CONFIG_SH_WRITETHROUGH
+       pteval |= _PAGE_WT;
+#endif
+       /* conveniently, we want all the software flags to be 0 anyway */
+       ctrl_outl(pteval, MMU_PTEL);
+
+       /* Load the TLB */
+       asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
+       local_irq_restore(flags);
+}
 
 void local_flush_tlb_one(unsigned long asid, unsigned long page)
 {
@@ -28,3 +93,4 @@ void local_flush_tlb_one(unsigned long asid, unsigned long page)
        ctrl_outl(data, addr);
        back_to_P1();
 }
+