patch-2.1.96 linux/include/asm-arm/arch-rpc/mm-init.h

• Lines: 48
• Date: Sun Apr 12 11:42:16 1998
• Orig file: v2.1.95/linux/include/asm-arm/arch-rpc/mm-init.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.95/linux/include/asm-arm/arch-rpc/mm-init.h linux/include/asm-arm/arch-rpc/mm-init.h
@@ -0,0 +1,47 @@
+/*
+ * linux/include/asm-arm/arch-rpc/mmap.h
+ *
+ * Copyright (C) 1996 Russell King
+ */
+
+#define HAVE_MAP_VID_MEM
+
+unsigned long map_screen_mem(unsigned long log_start, unsigned long kmem, int update)
+{
+	static int updated = 0;
+	unsigned long address;
+	pgd_t *pgd;
+
+	if (updated)
+		return 0;
+	updated = update;
+
+	address = SCREEN_START | PMD_TYPE_SECT | PMD_DOMAIN(DOMAIN_KERNEL) | PMD_SECT_AP_WRITE;
+	pgd = swapper_pg_dir + (SCREEN2_BASE >> PGDIR_SHIFT);
+	pgd_val(pgd[0]) = address;
+	pgd_val(pgd[1]) = address + (1 << PGDIR_SHIFT);
+
+	if (update) {
+		unsigned long pgtable = PAGE_ALIGN(kmem), *p;
+		int i;
+
+		memzero ((void *)pgtable, 4096);
+		
+		pgd_val(pgd[-2]) = __virt_to_phys(pgtable) | PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_KERNEL);
+		pgd_val(pgd[-1]) = __virt_to_phys(pgtable + PTRS_PER_PTE*4) | PMD_TYPE_TABLE | PMD_DOMAIN(DOMAIN_KERNEL);
+		p = (unsigned long *)pgtable;
+
+		i = PTRS_PER_PTE * 2 - ((SCREEN1_END - log_start) >> PAGE_SHIFT);
+		address = SCREEN_START | PTE_TYPE_SMALL | PTE_AP_WRITE;
+
+		while (i < PTRS_PER_PTE * 2) {
+			p[i++] = address;
+			address += PAGE_SIZE;
+		}
+
+		flush_page_to_ram(pgtable);
+
+		kmem = pgtable + PAGE_SIZE;
+	}
+	return kmem;
+}