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Diffstat (limited to 'kernel/arch/m32r/mm/init.c')
| -rw-r--r-- | kernel/arch/m32r/mm/init.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/kernel/arch/m32r/mm/init.c b/kernel/arch/m32r/mm/init.c new file mode 100644 index 000000000..0d4146f64 --- /dev/null +++ b/kernel/arch/m32r/mm/init.c @@ -0,0 +1,148 @@ +/* + * linux/arch/m32r/mm/init.c + * + * Copyright (c) 2001, 2002 Hitoshi Yamamoto + * + * Some code taken from sh version. + * Copyright (C) 1999 Niibe Yutaka + * Based on linux/arch/i386/mm/init.c: + * Copyright (C) 1995 Linus Torvalds + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/pagemap.h> +#include <linux/bootmem.h> +#include <linux/swap.h> +#include <linux/highmem.h> +#include <linux/bitops.h> +#include <linux/nodemask.h> +#include <linux/pfn.h> +#include <linux/gfp.h> +#include <asm/types.h> +#include <asm/processor.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/pgalloc.h> +#include <asm/mmu_context.h> +#include <asm/setup.h> +#include <asm/tlb.h> +#include <asm/sections.h> + +pgd_t swapper_pg_dir[1024]; + +/* + * Cache of MMU context last used. + */ +#ifndef CONFIG_SMP +unsigned long mmu_context_cache_dat; +#else +unsigned long mmu_context_cache_dat[NR_CPUS]; +#endif + +/* + * function prototype + */ +void __init paging_init(void); +void __init mem_init(void); +void free_initmem(void); +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long, unsigned long); +#endif + +/* It'd be good if these lines were in the standard header file. */ +#define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn) +#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn) + +#ifndef CONFIG_DISCONTIGMEM +void __init zone_sizes_init(void) +{ + unsigned long zones_size[MAX_NR_ZONES] = {0, }; + unsigned long max_dma; + unsigned long low; + unsigned long start_pfn; + +#ifdef CONFIG_MMU + start_pfn = START_PFN(0); + max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; + low = MAX_LOW_PFN(0); + + if (low < max_dma){ + zones_size[ZONE_DMA] = low - start_pfn; + zones_size[ZONE_NORMAL] = 0; + } else { + zones_size[ZONE_DMA] = low - start_pfn; + zones_size[ZONE_NORMAL] = low - max_dma; + } +#else + zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; + zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT; + start_pfn = __MEMORY_START >> PAGE_SHIFT; +#endif /* CONFIG_MMU */ + + free_area_init_node(0, zones_size, start_pfn, 0); +} +#else /* CONFIG_DISCONTIGMEM */ +extern void zone_sizes_init(void); +#endif /* CONFIG_DISCONTIGMEM */ + +/*======================================================================* + * paging_init() : sets up the page tables + *======================================================================*/ +void __init paging_init(void) +{ +#ifdef CONFIG_MMU + int i; + pgd_t *pg_dir; + + /* We don't need kernel mapping as hardware support that. */ + pg_dir = swapper_pg_dir; + + for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++) + pgd_val(pg_dir[i]) = 0; +#endif /* CONFIG_MMU */ + zone_sizes_init(); +} + +/*======================================================================* + * mem_init() : + * orig : arch/sh/mm/init.c + *======================================================================*/ +void __init mem_init(void) +{ +#ifndef CONFIG_MMU + extern unsigned long memory_end; + + high_memory = (void *)(memory_end & PAGE_MASK); +#else + high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0))); +#endif /* CONFIG_MMU */ + + /* clear the zero-page */ + memset(empty_zero_page, 0, PAGE_SIZE); + + set_max_mapnr(get_num_physpages()); + free_all_bootmem(); + mem_init_print_info(NULL); +} + +/*======================================================================* + * free_initmem() : + * orig : arch/sh/mm/init.c + *======================================================================*/ +void free_initmem(void) +{ + free_initmem_default(-1); +} + +#ifdef CONFIG_BLK_DEV_INITRD +/*======================================================================* + * free_initrd_mem() : + * orig : arch/sh/mm/init.c + *======================================================================*/ +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, -1, "initrd"); +} +#endif |