2 * linux/arch/m68k/mm/sun3mmu.c
4 * Implementations of mm routines specific to the sun3 MMU.
6 * Moved here 8/20/1999 Sam Creasey
10 #include <linux/signal.h>
11 #include <linux/sched.h>
13 #include <linux/swap.h>
14 #include <linux/kernel.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/init.h>
18 #include <linux/bootmem.h>
20 #include <asm/setup.h>
21 #include <asm/uaccess.h>
23 #include <asm/pgtable.h>
24 #include <asm/machdep.h>
27 extern void mmu_emu_init (unsigned long bootmem_end);
29 const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
31 extern unsigned long num_pages;
33 void free_initmem(void)
37 /* For the sun3 we try to follow the i386 paging_init() more closely */
38 /* start_mem and end_mem have PAGE_OFFSET added already */
39 /* now sets up tables using sun3 PTEs rather than i386 as before. --m */
40 void __init paging_init(void)
45 unsigned long address;
46 unsigned long next_pgtable;
47 unsigned long bootmem_end;
48 unsigned long zones_size[MAX_NR_ZONES] = { 0, };
51 #ifdef TEST_VERIFY_AREA
54 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
56 address = PAGE_OFFSET;
57 pg_dir = swapper_pg_dir;
58 memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
59 memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
61 size = num_pages * sizeof(pte_t);
62 size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
64 next_pgtable = (unsigned long)alloc_bootmem_pages(size);
65 bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
67 /* Map whole memory from PAGE_OFFSET (0x0E000000) */
68 pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
70 while (address < (unsigned long)high_memory) {
71 pg_table = (pte_t *) __pa (next_pgtable);
72 next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
73 pgd_val(*pg_dir) = (unsigned long) pg_table;
76 /* now change pg_table to kernel virtual addresses */
77 pg_table = (pte_t *) __va ((unsigned long) pg_table);
78 for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
79 pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
80 if (address >= (unsigned long)high_memory)
82 set_pte (pg_table, pte);
87 mmu_emu_init(bootmem_end);
91 /* memory sizing is a hack stolen from motorola.c.. hope it works for us */
92 zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
94 /* I really wish I knew why the following change made things better... -- Sam */
95 /* free_area_init(zones_size); */
96 free_area_init_node(0, zones_size,
97 (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);