| /* |
| * 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> |
| |
| #undef DEBUG |
| |
| /* |
| * 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; |
| |
| extern unsigned long rom_length; |
| |
| extern unsigned long memory_start; |
| extern unsigned long memory_end; |
| |
| /* |
| * 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. |
| */ |
| #ifdef DEBUG |
| unsigned long start_mem = PAGE_ALIGN(memory_start); |
| #endif |
| unsigned long end_mem = memory_end & PAGE_MASK; |
| |
| #ifdef DEBUG |
| printk ("start_mem is %#lx\nvirtual_end is %#lx\n", |
| start_mem, end_mem); |
| #endif |
| |
| /* |
| * 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); |
| |
| #ifdef DEBUG |
| printk ("before free_area_init\n"); |
| |
| printk ("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n", |
| start_mem, end_mem); |
| #endif |
| |
| { |
| unsigned long zones_size[MAX_NR_ZONES] = {0, }; |
| |
| zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT; |
| zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT; |
| #ifdef CONFIG_HIGHMEM |
| zones_size[ZONE_HIGHMEM] = 0; |
| #endif |
| free_area_init(zones_size); |
| } |
| } |
| |
| void __init mem_init(void) |
| { |
| int codek = 0, datak = 0, initk = 0; |
| /* DAVIDM look at setup memory map generically with reserved area */ |
| unsigned long tmp; |
| extern unsigned long _ramend, _ramstart; |
| unsigned long len = &_ramend - &_ramstart; |
| unsigned long start_mem = memory_start; /* DAVIDM - these must start at end of kernel */ |
| unsigned long end_mem = memory_end; /* DAVIDM - this must not include kernel stack at top */ |
| |
| #ifdef DEBUG |
| printk(KERN_DEBUG "Mem_init: start=%lx, end=%lx\n", start_mem, end_mem); |
| #endif |
| |
| end_mem &= PAGE_MASK; |
| high_memory = (void *) end_mem; |
| |
| start_mem = PAGE_ALIGN(start_mem); |
| max_mapnr = num_physpages = MAP_NR(high_memory); |
| |
| /* this will put all low memory onto the freelists */ |
| free_all_bootmem(); |
| |
| codek = (_etext - _stext) >> 10; |
| datak = (__bss_stop - _sdata) >> 10; |
| initk = (__init_begin - __init_end) >> 10; |
| |
| tmp = nr_free_pages() << PAGE_SHIFT; |
| printk(KERN_INFO "Memory available: %luk/%luk RAM, %luk/%luk ROM (%dk kernel code, %dk data)\n", |
| tmp >> 10, |
| len >> 10, |
| (rom_length > 0) ? ((rom_length >> 10) - codek) : 0, |
| rom_length >> 10, |
| codek, |
| datak |
| ); |
| } |
| |
| |
| #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) |
| { |
| #ifdef CONFIG_RAMKERNEL |
| free_initmem_default(-1); |
| #endif |
| } |
| |