diff options
Diffstat (limited to 'arch/csky/mm/init.c')
| -rw-r--r-- | arch/csky/mm/init.c | 138 |
1 files changed, 48 insertions, 90 deletions
diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c index af627128314f..573da66b2543 100644 --- a/arch/csky/mm/init.c +++ b/arch/csky/mm/init.c @@ -28,122 +28,60 @@ #include <asm/mmu_context.h> #include <asm/sections.h> #include <asm/tlb.h> +#include <asm/cacheflush.h> + +#define PTRS_KERN_TABLE \ + ((PTRS_PER_PGD - USER_PTRS_PER_PGD) * PTRS_PER_PTE) pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss; +pte_t kernel_pte_tables[PTRS_KERN_TABLE] __page_aligned_bss; + EXPORT_SYMBOL(invalid_pte_table); unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; EXPORT_SYMBOL(empty_zero_page); -#ifdef CONFIG_BLK_DEV_INITRD -static void __init setup_initrd(void) +void free_initmem(void) { - unsigned long size; - - if (initrd_start >= initrd_end) { - pr_err("initrd not found or empty"); - goto disable; - } - - if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { - pr_err("initrd extends beyond end of memory"); - goto disable; - } - - size = initrd_end - initrd_start; - - if (memblock_is_region_reserved(__pa(initrd_start), size)) { - pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region", - __pa(initrd_start), size); - goto disable; - } - - memblock_reserve(__pa(initrd_start), size); - - pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n", - (void *)(initrd_start), size); - - initrd_below_start_ok = 1; - - return; - -disable: - initrd_start = initrd_end = 0; - - pr_err(" - disabling initrd\n"); + free_initmem_default(-1); } -#endif -void __init mem_init(void) +void pgd_init(unsigned long *p) { -#ifdef CONFIG_HIGHMEM - unsigned long tmp; - - max_mapnr = highend_pfn; -#else - max_mapnr = max_low_pfn; -#endif - high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT); - -#ifdef CONFIG_BLK_DEV_INITRD - setup_initrd(); -#endif - - memblock_free_all(); + int i; -#ifdef CONFIG_HIGHMEM - for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) { - struct page *page = pfn_to_page(tmp); + for (i = 0; i < PTRS_PER_PGD; i++) + p[i] = __pa(invalid_pte_table); - /* FIXME not sure about */ - if (!memblock_is_reserved(tmp << PAGE_SHIFT)) - free_highmem_page(page); - } -#endif - mem_init_print_info(NULL); + flush_tlb_all(); + local_icache_inv_all(NULL); } -extern char __init_begin[], __init_end[]; - -void free_initmem(void) +void __init mmu_init(unsigned long min_pfn, unsigned long max_pfn) { - unsigned long addr; - - addr = (unsigned long) &__init_begin; + int i; - while (addr < (unsigned long) &__init_end) { - ClearPageReserved(virt_to_page(addr)); - init_page_count(virt_to_page(addr)); - free_page(addr); - totalram_pages_inc(); - addr += PAGE_SIZE; - } + for (i = 0; i < USER_PTRS_PER_PGD; i++) + swapper_pg_dir[i].pgd = __pa(invalid_pte_table); - pr_info("Freeing unused kernel memory: %dk freed\n", - ((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10); -} + for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++) + swapper_pg_dir[i].pgd = + __pa(kernel_pte_tables + (PTRS_PER_PTE * (i - USER_PTRS_PER_PGD))); -void pgd_init(unsigned long *p) -{ - int i; + for (i = 0; i < PTRS_KERN_TABLE; i++) + set_pte(&kernel_pte_tables[i], __pte(_PAGE_GLOBAL)); - for (i = 0; i < PTRS_PER_PGD; i++) - p[i] = __pa(invalid_pte_table); -} + for (i = min_pfn; i < max_pfn; i++) + set_pte(&kernel_pte_tables[i - PFN_DOWN(va_pa_offset)], pfn_pte(i, PAGE_KERNEL)); -void __init pre_mmu_init(void) -{ - /* - * Setup page-table and enable TLB-hardrefill - */ flush_tlb_all(); - pgd_init((unsigned long *)swapper_pg_dir); - TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir); - TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir); + local_icache_inv_all(NULL); /* Setup page mask to 4k */ write_mmu_pagemask(0); + + setup_pgd(swapper_pg_dir, 0); } void __init fixrange_init(unsigned long start, unsigned long end, @@ -192,3 +130,23 @@ void __init fixaddr_init(void) vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK; fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir); } + +static const pgprot_t protection_map[16] = { + [VM_NONE] = PAGE_NONE, + [VM_READ] = PAGE_READ, + [VM_WRITE] = PAGE_READ, + [VM_WRITE | VM_READ] = PAGE_READ, + [VM_EXEC] = PAGE_READ, + [VM_EXEC | VM_READ] = PAGE_READ, + [VM_EXEC | VM_WRITE] = PAGE_READ, + [VM_EXEC | VM_WRITE | VM_READ] = PAGE_READ, + [VM_SHARED] = PAGE_NONE, + [VM_SHARED | VM_READ] = PAGE_READ, + [VM_SHARED | VM_WRITE] = PAGE_WRITE, + [VM_SHARED | VM_WRITE | VM_READ] = PAGE_WRITE, + [VM_SHARED | VM_EXEC] = PAGE_READ, + [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ, + [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_WRITE, + [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_WRITE +}; +DECLARE_VM_GET_PAGE_PROT |