diff options
Diffstat (limited to 'arch/m32r/mm/init.c')
| -rw-r--r-- | arch/m32r/mm/init.c | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/arch/m32r/mm/init.c b/arch/m32r/mm/init.c new file mode 100644 index 00000000..78b660e9 --- /dev/null +++ b/arch/m32r/mm/init.c @@ -0,0 +1,216 @@ +/* + * 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> + +/* References to section boundaries */ +extern char _text, _etext, _edata; +extern char __init_begin, __init_end; + +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 +static unsigned long hole_pages; + +/* + * 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 +unsigned long __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); + + return 0; +} +#else /* CONFIG_DISCONTIGMEM */ +extern unsigned long 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 */ + hole_pages = zone_sizes_init(); +} + +int __init reservedpages_count(void) +{ + int reservedpages, nid, i; + + reservedpages = 0; + for_each_online_node(nid) { + unsigned long flags; + pgdat_resize_lock(NODE_DATA(nid), &flags); + for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++) + if (PageReserved(nid_page_nr(nid, i))) + reservedpages++; + pgdat_resize_unlock(NODE_DATA(nid), &flags); + } + + return reservedpages; +} + +/*======================================================================* + * mem_init() : + * orig : arch/sh/mm/init.c + *======================================================================*/ +void __init mem_init(void) +{ + int codesize, reservedpages, datasize, initsize; + int nid; +#ifndef CONFIG_MMU + extern unsigned long memory_end; +#endif + + num_physpages = 0; + for_each_online_node(nid) + num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1; + + num_physpages -= hole_pages; + +#ifndef CONFIG_DISCONTIGMEM + max_mapnr = num_physpages; +#endif /* CONFIG_DISCONTIGMEM */ + +#ifdef CONFIG_MMU + high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0))); +#else + high_memory = (void *)(memory_end & PAGE_MASK); +#endif /* CONFIG_MMU */ + + /* clear the zero-page */ + memset(empty_zero_page, 0, PAGE_SIZE); + + /* this will put all low memory onto the freelists */ + for_each_online_node(nid) + totalram_pages += free_all_bootmem_node(NODE_DATA(nid)); + + reservedpages = reservedpages_count() - hole_pages; + codesize = (unsigned long) &_etext - (unsigned long)&_text; + datasize = (unsigned long) &_edata - (unsigned long)&_etext; + initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin; + + printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, " + "%dk reserved, %dk data, %dk init)\n", + nr_free_pages() << (PAGE_SHIFT-10), + num_physpages << (PAGE_SHIFT-10), + codesize >> 10, + reservedpages << (PAGE_SHIFT-10), + datasize >> 10, + initsize >> 10); +} + +/*======================================================================* + * free_initmem() : + * orig : arch/sh/mm/init.c + *======================================================================*/ +void free_initmem(void) +{ + unsigned long addr; + + addr = (unsigned long)(&__init_begin); + for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) { + ClearPageReserved(virt_to_page(addr)); + init_page_count(virt_to_page(addr)); + free_page(addr); + totalram_pages++; + } + printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \ + (int)(&__init_end - &__init_begin) >> 10); +} + +#ifdef CONFIG_BLK_DEV_INITRD +/*======================================================================* + * free_initrd_mem() : + * orig : arch/sh/mm/init.c + *======================================================================*/ +void free_initrd_mem(unsigned long start, unsigned long end) +{ + unsigned long p; + for (p = start; p < end; p += PAGE_SIZE) { + ClearPageReserved(virt_to_page(p)); + init_page_count(virt_to_page(p)); + free_page(p); + totalram_pages++; + } + printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10); +} +#endif |