patch-2.4.0-prerelease linux/arch/m68k/mm/sun3mmu.c

• Lines: 110
• Date: Fri Dec 29 14:07:20 2000
• Orig file: v2.4.0-test12/linux/arch/m68k/mm/sun3mmu.c
• Orig date: Sun Feb 13 11:21:42 2000

diff -u --recursive --new-file v2.4.0-test12/linux/arch/m68k/mm/sun3mmu.c linux/arch/m68k/mm/sun3mmu.c
@@ -19,6 +19,7 @@
 #ifdef CONFIG_BLK_DEV_RAM
 #include <linux/blk.h>
 #endif
+#include <linux/bootmem.h>
 
 #include <asm/setup.h>
 #include <asm/uaccess.h>
@@ -28,39 +29,39 @@
 #include <asm/machdep.h>
 #include <asm/io.h>
 
-extern void mmu_emu_init (void);
-
-extern unsigned long free_area_init(unsigned long *zones_size);
+extern void mmu_emu_init (unsigned long bootmem_end);
 
 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;
+extern unsigned long num_pages;
 
 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)
+void __init paging_init(void)
 {
 	pgd_t * pg_dir;
 	pte_t * pg_table;
 	int i;
 	unsigned long address;
+	unsigned long next_pgtable;
+	unsigned long bootmem_end;
+	unsigned long zones_size[3] = {0, 0, 0};
+	unsigned long size;
+
 
 #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;
+	empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+	empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
+	empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
 	memset((void *)empty_zero_page, 0, PAGE_SIZE);
 
 	address = PAGE_OFFSET;
@@ -68,12 +69,18 @@
 	memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
 	memset (kernel_pg_dir,  0, sizeof (kernel_pg_dir));
 
+	size = num_pages * sizeof(pte_t);
+	size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
+	
+	next_pgtable = (unsigned long)alloc_bootmem_pages(size);
+	bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
+
 	/* 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);
+	while (address < (unsigned long)high_memory) {
+		pg_table = (pte_t *) __pa (next_pgtable);
+		next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
 		pgd_val(*pg_dir) = (unsigned long) pg_table;
 		pg_dir++;
 
@@ -81,18 +88,24 @@
 		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)
+			if (address >= (unsigned long)high_memory)
 				pte_val (pte) = 0;
 			set_pte (pg_table, pte);
 			address += PAGE_SIZE;
 		}
 	}
 
-	mmu_emu_init();
+	mmu_emu_init(bootmem_end);
 	
 	current->mm = NULL;
 
-	return PAGE_ALIGN(free_area_init(start_mem, end_mem));
+	/* memory sizing is a hack stolen from motorola.c..  hope it works for us */
+	zones_size[1] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
+	zones_size[0] = zones_size[1]/2;
+	zones_size[1] -= zones_size[0];
+	
+	free_area_init(zones_size);
+
 }