X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=arch%2Fsh%2Fmm%2Ftlb-sh4.c;h=2d1dd6044307e1d3b6049b74708c4e7e00aca7f9;hb=81f8320f624a785d77443ace83391d0fdee695f6;hp=221e7095473d383348d57c9389f5f7be146ac34f;hpb=b0138a6cb7923a997d278b47c176778534d1095b;p=pandora-kernel.git

diff --git a/arch/sh/mm/tlb-sh4.c b/arch/sh/mm/tlb-sh4.c
index 221e7095473d..2d1dd6044307 100644
--- a/arch/sh/mm/tlb-sh4.c
+++ b/arch/sh/mm/tlb-sh4.c
@@ -4,13 +4,80 @@
  * SH-4 specific TLB operations
  *
  * Copyright (C) 1999  Niibe Yutaka
- * Copyright (C) 2002  Paul Mundt
+ * Copyright (C) 2002 - 2007 Paul Mundt
  *
  * Released under the terms of the GNU GPL v2.0.
  */
+#include <linux/kernel.h>
+#include <linux/mm.h>
 #include <linux/io.h>
 #include <asm/system.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;
+
+	/* Ptrace may call this routine. */
+	if (vma && current->active_mm != vma->vm_mm)
+		return;
+
+#ifndef CONFIG_CACHE_OFF
+	{
+		unsigned long pfn = pte_pfn(pte);
+
+		if (pfn_valid(pfn)) {
+			struct page *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);
+			}
+		}
+	}
+#endif
+
+	local_irq_save(flags);
+
+	/* Set PTEH register */
+	vpn = (address & MMU_VPN_MASK) | get_asid();
+	ctrl_outl(vpn, MMU_PTEH);
+
+	pteval = pte.pte_low;
+
+	/* Set PTEA register */
+#ifdef CONFIG_X2TLB
+	/*
+	 * For the extended mode TLB this is trivial, only the ESZ and
+	 * EPR bits need to be written out to PTEA, with the remainder of
+	 * the protection bits (with the exception of the compat-mode SZ
+	 * and PR bits, which are cleared) being written out in PTEL.
+	 */
+	ctrl_outl(pte.pte_high, MMU_PTEA);
+#else
+	if (cpu_data->flags & CPU_HAS_PTEA)
+		/* TODO: make this look less hacky */
+		ctrl_outl(((pteval >> 28) & 0xe) | (pteval & 0x1), MMU_PTEA);
+#endif
+
+	/* Set PTEL register */
+	pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
+#ifdef CONFIG_CACHE_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)
 {