patch-2.1.110 linux/arch/arm/mm/mm-armv.c

• Lines: 72
• Date: Sat Jul 18 11:55:23 1998
• Orig file: v2.1.109/linux/arch/arm/mm/mm-armv.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.109/linux/arch/arm/mm/mm-armv.c linux/arch/arm/mm/mm-armv.c
@@ -0,0 +1,71 @@
+/*
+ * arch/arm/mm/mm-armv.c
+ *
+ * Common routines for ARM v3 and v4 architectures.
+ *
+ * Copyright (C) 1998 Russell King
+ *
+ * Do not compile this file directly!
+ */
+
+#ifndef MAPPING
+#error MAPPING not defined - do not compile this file individually
+#endif
+
+static const struct mapping {
+	unsigned long virtual;
+	unsigned long physical;
+	unsigned long length;
+	int domain:4,
+	    prot_read:1,
+	    prot_write:1;
+} mapping[] __initdata = {
+	MAPPING
+};
+
+#define SIZEOFMAP (sizeof(mapping) / sizeof(mapping[0]))
+
+__initfunc(unsigned long setup_io_pagetables(unsigned long start_mem))
+{
+	const struct mapping *mp;
+	int i;
+
+	for (i = 0, mp = mapping; i < SIZEOFMAP; i++, mp++) {
+		unsigned long virtual, physical, length;
+		int prot;
+
+		virtual = mp->virtual;
+		physical = mp->physical;
+		length = mp->length;
+		prot = (mp->prot_read ? PTE_AP_READ : 0) | (mp->prot_write ? PTE_AP_WRITE : 0);
+
+		while ((virtual & 1048575 || physical & 1048575) && length >= PAGE_SIZE) {
+			alloc_init_page(&start_mem, virtual, physical, mp->domain, prot);
+			length -= PAGE_SIZE;
+			virtual += PAGE_SIZE;
+			physical += PAGE_SIZE;
+		}
+
+		prot = (mp->prot_read ? PMD_SECT_AP_READ : 0) |
+		       (mp->prot_write ? PMD_SECT_AP_WRITE : 0);
+
+		while (length >= 1048576) {
+			alloc_init_section(&start_mem, virtual, physical, mp->domain, prot);
+			length -= 1048576;
+			virtual += 1048576;
+			physical += 1048576;
+		}
+
+		prot = (mp->prot_read ? PTE_AP_READ : 0) | (mp->prot_write ? PTE_AP_WRITE : 0);
+
+		while (length >= PAGE_SIZE) {
+			alloc_init_page(&start_mem, virtual, physical, mp->domain, prot);
+			length -= PAGE_SIZE;
+			virtual += PAGE_SIZE;
+			physical += PAGE_SIZE;
+		}
+	}
+
+	return start_mem;
+}
+