patch-2.3.17 linux/arch/m68k/mm/sun3mmu.c

• Lines: 99
• Date: Sat Sep 4 13:06:41 1999
• Orig file: v2.3.16/linux/arch/m68k/mm/sun3mmu.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.16/linux/arch/m68k/mm/sun3mmu.c linux/arch/m68k/mm/sun3mmu.c
@@ -0,0 +1,98 @@
+/* 
+ * linux/arch/m68k/mm/sun3mmu.c
+ *
+ * Implementations of mm routines specific to the sun3 MMU.
+ *
+ * Moved here 8/20/1999 Sam Creasey
+ *
+ */
+
+#include <linux/config.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#ifdef CONFIG_BLK_DEV_RAM
+#include <linux/blk.h>
+#endif
+
+#include <asm/setup.h>
+#include <asm/uaccess.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/system.h>
+#include <asm/machdep.h>
+#include <asm/io.h>
+
+extern void mmu_emu_init (void);
+
+extern unsigned long free_area_init(unsigned long, unsigned long);
+
+const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
+
+extern unsigned long empty_bad_page_table;
+extern unsigned long empty_bad_page;
+
+void free_initmem(void)
+{
+}
+/* For the sun3 we try to follow the i386 paging_init() more closely */
+/* start_mem and end_mem have PAGE_OFFSET added already */
+/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
+unsigned long __init paging_init(unsigned long start_mem,
+				 unsigned long end_mem)
+{
+	pgd_t * pg_dir;
+	pte_t * pg_table;
+	int i;
+	unsigned long address;
+
+#ifdef TEST_VERIFY_AREA
+	wp_works_ok = 0;
+#endif
+	start_mem = PAGE_ALIGN(start_mem);
+	empty_bad_page_table = start_mem;
+	start_mem += PAGE_SIZE;
+	empty_bad_page = start_mem;
+	start_mem += PAGE_SIZE;
+	empty_zero_page = start_mem;
+	start_mem += PAGE_SIZE;
+	memset((void *)empty_zero_page, 0, PAGE_SIZE);
+
+	address = PAGE_OFFSET;
+	pg_dir = swapper_pg_dir;
+	memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
+	memset (kernel_pg_dir,  0, sizeof (kernel_pg_dir));
+
+	/* Map whole memory from PAGE_OFFSET (0x0E000000) */
+	pg_dir += PAGE_OFFSET >> PGDIR_SHIFT; 
+
+	while (address < end_mem) {
+		pg_table = (pte_t *) __pa (start_mem);
+		start_mem += PTRS_PER_PTE * sizeof (pte_t);
+		pgd_val(*pg_dir) = (unsigned long) pg_table;
+		pg_dir++;
+
+		/* now change pg_table to kernel virtual addresses */
+		pg_table = (pte_t *) __va ((unsigned long) pg_table);
+		for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
+			pte_t pte = mk_pte (address, PAGE_INIT);
+			if (address >= end_mem)
+				pte_val (pte) = 0;
+			set_pte (pg_table, pte);
+			address += PAGE_SIZE;
+		}
+	}
+
+	mmu_emu_init();
+	
+	current->mm = NULL;
+
+	return PAGE_ALIGN(free_area_init(start_mem, end_mem));
+}
+
+