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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [arch/] [m68k/] [mm/] [sun3mmu.c] - Rev 3
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/* * linux/arch/m68k/mm/sun3mmu.c * * Implementations of mm routines specific to the sun3 MMU. * * Moved here 8/20/1999 Sam Creasey * */ #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> #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 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[MAX_NR_ZONES] = { 0, }; unsigned long size; #ifdef TEST_VERIFY_AREA wp_works_ok = 0; #endif empty_zero_page = alloc_bootmem_pages(PAGE_SIZE); memset(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 = pfn_pte(virt_to_pfn(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[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT; /* I really wish I knew why the following change made things better... -- Sam */ /* free_area_init(zones_size); */ free_area_init_node(0, NODE_DATA(0), zones_size, (__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL); }