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Diffstat (limited to 'arch/h8300/mm/init.c')
| -rw-r--r-- | arch/h8300/mm/init.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/h8300/mm/init.c b/arch/h8300/mm/init.c new file mode 100644 index 000000000000..495a3d6b539b --- /dev/null +++ b/arch/h8300/mm/init.c @@ -0,0 +1,128 @@ +/* + * linux/arch/h8300/mm/init.c + * + * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, + * Kenneth Albanowski <kjahds@kjahds.com>, + * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) + * + * Based on: + * + * linux/arch/m68knommu/mm/init.c + * linux/arch/m68k/mm/init.c + * + * Copyright (C) 1995 Hamish Macdonald + * + * JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com) + * DEC/2000 -- linux 2.4 support <davidm@snapgear.com> + */ + +#include <linux/signal.h> +#include <linux/sched.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/types.h> +#include <linux/ptrace.h> +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/init.h> +#include <linux/highmem.h> +#include <linux/pagemap.h> +#include <linux/bootmem.h> +#include <linux/gfp.h> + +#include <asm/setup.h> +#include <asm/segment.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/sections.h> + +/* + * BAD_PAGE is the page that is used for page faults when linux + * is out-of-memory. Older versions of linux just did a + * do_exit(), but using this instead means there is less risk + * for a process dying in kernel mode, possibly leaving a inode + * unused etc.. + * + * BAD_PAGETABLE is the accompanying page-table: it is initialized + * to point to BAD_PAGE entries. + * + * ZERO_PAGE is a special page that is used for zero-initialized + * data and COW. + */ +static unsigned long empty_bad_page_table; +static unsigned long empty_bad_page; +unsigned long empty_zero_page; + +/* + * paging_init() continues the virtual memory environment setup which + * was begun by the code in arch/head.S. + * The parameters are pointers to where to stick the starting and ending + * addresses of available kernel virtual memory. + */ +void __init paging_init(void) +{ + /* + * Make sure start_mem is page aligned, otherwise bootmem and + * page_alloc get different views og the world. + */ + unsigned long start_mem = PAGE_ALIGN(memory_start); + unsigned long end_mem = memory_end & PAGE_MASK; + + pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n", + start_mem, end_mem); + + /* + * Initialize the bad page table and bad page to point + * to a couple of allocated pages. + */ + 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); + + /* + * Set up SFC/DFC registers (user data space). + */ + set_fs(USER_DS); + + pr_debug("before free_area_init\n"); + + pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", + start_mem, end_mem); + + { + unsigned long zones_size[MAX_NR_ZONES] = {0, }; + + zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; + free_area_init(zones_size); + } +} + +void __init mem_init(void) +{ + pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end); + + high_memory = (void *) (memory_end & PAGE_MASK); + max_mapnr = MAP_NR(high_memory); + + /* this will put all low memory onto the freelists */ + free_all_bootmem(); + + mem_init_print_info(NULL); +} + + +#ifdef CONFIG_BLK_DEV_INITRD +void free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, -1, "initrd"); +} +#endif + +void +free_initmem(void) +{ + free_initmem_default(-1); +} |