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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | /* * 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: %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 */ 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); } |