sun3mmu.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:3k
- /*
- * 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 <linux/bootmem.h>
- #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 (unsigned long bootmem_end);
- const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lxn";
- 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 */
- 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
- 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;
- pg_dir = swapper_pg_dir;
- 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 < (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++;
- /* 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 >= (unsigned long)high_memory)
- pte_val (pte) = 0;
- set_pte (pg_table, pte);
- address += PAGE_SIZE;
- }
- }
- mmu_emu_init(bootmem_end);
-
- current->mm = NULL;
- /* 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);
- }