X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=arch%2Fsh%2Fmm%2Finit.c;h=4e9c854845a4461155b5fd040de85dcdf4c19784;hb=f7f1b0f1e2fbadeab12d24236000e778aa9b1ead;hp=95b5368c06700615a85bfc93b252ef936a28b5f9;hpb=5273a3df6485dc2ad6aa7ddd441b9a21970f003b;p=linux-2.6.git

diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index 95b5368c0..4e9c85484 100644
--- 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;
@@ -154,10 +214,8 @@ void __init paging_init(void)
 	 */
 	disable_mmu();
 #endif
-
-	free_area_init_node(0, NODE_DATA(0), 0, zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
-	/* XXX: MRB-remove - this doesn't seem sane, should this be done somewhere else ?*/
-	mem_map = NODE_DATA(0)->node_mem_map;
+	NODE_DATA(0)->node_mem_map = NULL;
+	free_area_init_node(0, NODE_DATA(0), zones_size, __MEMORY_START >> PAGE_SHIFT, 0);
 
 #ifdef CONFIG_DISCONTIGMEM
 	/*
@@ -165,7 +223,7 @@ void __init paging_init(void)
 	 */
 	zones_size[ZONE_DMA] = __MEMORY_SIZE_2ND >> PAGE_SHIFT;
 	zones_size[ZONE_NORMAL] = 0;
-	free_area_init_node(1, NODE_DATA(1), 0, zones_size, __MEMORY_START_2ND >> PAGE_SHIFT, 0);
+	free_area_init_node(1, NODE_DATA(1), zones_size, __MEMORY_START_2ND >> PAGE_SHIFT, 0);
 #endif
 }