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/config.h>
11 #include <linux/signal.h>
12 #include <linux/sched.h>
14 #include <linux/swap.h>
15 #include <linux/kernel.h>
16 #include <linux/string.h>
17 #include <linux/types.h>
18 #include <linux/init.h>
19 #include <linux/bootmem.h>
21 #include <asm/setup.h>
22 #include <asm/uaccess.h>
24 #include <asm/pgtable.h>
25 #include <asm/system.h>
26 #include <asm/machdep.h>
29 extern void mmu_emu_init (unsigned long bootmem_end);
31 const char bad_pmd_string[] = "Bad pmd in pte_alloc: %08lx\n";
33 extern unsigned long num_pages;
35 void free_initmem(void)
39 /* For the sun3 we try to follow the i386 paging_init() more closely */
40 /* start_mem and end_mem have PAGE_OFFSET added already */
41 /* now sets up tables using sun3 PTEs rather than i386 as before. --m */
42 void __init paging_init(void)
47 unsigned long address;
48 unsigned long next_pgtable;
49 unsigned long bootmem_end;
50 unsigned long zones_size[3] = {0, 0, 0};
54 #ifdef TEST_VERIFY_AREA
57 empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
58 memset(empty_zero_page, 0, PAGE_SIZE);
60 address = PAGE_OFFSET;
61 pg_dir = swapper_pg_dir;
62 memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
63 memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
65 size = num_pages * sizeof(pte_t);
66 size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
68 next_pgtable = (unsigned long)alloc_bootmem_pages(size);
69 bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
71 /* Map whole memory from PAGE_OFFSET (0x0E000000) */
72 pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
74 while (address < (unsigned long)high_memory) {
75 pg_table = (pte_t *) __pa (next_pgtable);
76 next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
77 pgd_val(*pg_dir) = (unsigned long) pg_table;
80 /* now change pg_table to kernel virtual addresses */
81 pg_table = (pte_t *) __va ((unsigned long) pg_table);
82 for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
83 pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
84 if (address >= (unsigned long)high_memory)
86 set_pte (pg_table, pte);
91 mmu_emu_init(bootmem_end);
95 /* memory sizing is a hack stolen from motorola.c.. hope it works for us */
96 zones_size[0] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
99 free_area_init(zones_size);