VServer 1.9.2 (patch-2.6.8.1-vs1.9.2.diff)

[linux-2.6.git] / arch / sh / mm / init.c

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 95b5368..7b49b69 100644 (file)
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -3,7 +3,7 @@
  *  linux/arch/sh/mm/init.c
  *
  *  Copyright (C) 1999  Niibe Yutaka
- *  Copyright (C) 2002  Paul Mundt
+ *  Copyright (C) 2002, 2004  Paul Mundt
  *
  *  Based on linux/arch/i386/mm/init.c:
  *   Copyright (C) 1995  Linus Torvalds
@@ -66,7 +66,7 @@ void show_mem(void)
 
        printk("Mem-info:\n");
        show_free_areas();
-       printk("Free swap:       %6dkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
+       printk("Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
        i = max_mapnr;
        while (i-- > 0) {
                total++;
@@ -83,6 +83,66 @@ void show_mem(void)
        printk("%d pages swap cached\n",cached);
 }
 
+static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
+{
+       pgd_t *pgd;
+       pmd_t *pmd;
+       pte_t *pte;
+
+       pgd = swapper_pg_dir + pgd_index(addr);
+       if (pgd_none(*pgd)) {
+               pgd_ERROR(*pgd);
+               return;
+       }
+
+       pmd = pmd_offset(pgd, addr);
+       if (pmd_none(*pmd)) {
+               pte = (pte_t *)get_zeroed_page(GFP_ATOMIC);
+               set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
+               if (pte != pte_offset_kernel(pmd, 0)) {
+                       pmd_ERROR(*pmd);
+                       return;
+               }
+       }
+
+       pte = pte_offset_kernel(pmd, addr);
+       if (!pte_none(*pte)) {
+               pte_ERROR(*pte);
+               return;
+       }
+
+       set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
+
+       __flush_tlb_page(get_asid(), addr);
+}
+
+/*
+ * As a performance optimization, other platforms preserve the fixmap mapping
+ * across a context switch, we don't presently do this, but this could be done
+ * in a similar fashion as to the wired TLB interface that sh64 uses (by way
+ * of the memorry mapped UTLB configuration) -- this unfortunately forces us to
+ * give up a TLB entry for each mapping we want to preserve. While this may be
+ * viable for a small number of fixmaps, it's not particularly useful for
+ * everything and needs to be carefully evaluated. (ie, we may want this for
+ * the vsyscall page).
+ *
+ * XXX: Perhaps add a _PAGE_WIRED flag or something similar that we can pass
+ * in at __set_fixmap() time to determine the appropriate behavior to follow.
+ *
+ *                                      -- PFM.
+ */
+void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
+{
+       unsigned long address = __fix_to_virt(idx);
+
+       if (idx >= __end_of_fixed_addresses) {
+               BUG();
+               return;
+       }
+
+       set_pte_phys(address, phys, prot);
+}
+
 /* References to section boundaries */
 
 extern char _text, _etext, _edata, __bss_start, _end;