patch-2.2.18 linux/arch/arm/mm/mm-armv.c

• Lines: 28
• Date: Fri Sep 15 23:28:37 2000
• Orig file: v2.2.17/arch/arm/mm/mm-armv.c
• Orig date: Fri Apr 21 12:45:45 2000

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/arch/arm/mm/mm-armv.c linux/arch/arm/mm/mm-armv.c
@@ -70,3 +70,27 @@
 
 	return start_mem;
 }
+
+/*
+ * In order to soft-boot, we need to insert a 1:1 mapping in place of
+ * the user-mode pages.  This will then ensure that we have predictable
+ * results when turning the mmu off
+ */
+void setup_mm_for_reboot(char mode)
+{
+	pgd_t *pgd;
+	pmd_t pmd;
+	int i;
+
+	if (current->mm && current->mm->pgd)
+		pgd = current->mm->pgd;
+	else
+		pgd = init_mm.pgd;
+
+	for (i = 0; i < USER_PTRS_PER_PGD; i++) {
+		pmd_val(pmd) = (i << PAGE_SHIFT) |
+			PMD_SECT_AP_WRITE | PMD_SECT_AP_READ |
+			PMD_TYPE_SECT;
+		set_pmd(pmd_offset(pgd + i, i << PGDIR_SHIFT), pmd);
+	}
+}