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author | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-01-27 18:47:36 +0100 |
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committer | Yoshinori Sato <ysato@users.sourceforge.jp> | 2015-06-23 06:35:53 +0200 |
commit | bbeb79acb3b44f727f6267e1f6db9b3fdf791c24 (patch) | |
tree | 630031609e4056c3d033d03c94d77af0a041adec /arch/h8300 | |
parent | h8300: miscellaneous functions (diff) | |
download | linux-bbeb79acb3b44f727f6267e1f6db9b3fdf791c24.tar.xz linux-bbeb79acb3b44f727f6267e1f6db9b3fdf791c24.zip |
h8300: Memory management
Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp>
Diffstat (limited to 'arch/h8300')
-rw-r--r-- | arch/h8300/mm/Makefile | 5 | ||||
-rw-r--r-- | arch/h8300/mm/fault.c | 57 | ||||
-rw-r--r-- | arch/h8300/mm/init.c | 128 | ||||
-rw-r--r-- | arch/h8300/mm/memory.c | 53 |
4 files changed, 243 insertions, 0 deletions
diff --git a/arch/h8300/mm/Makefile b/arch/h8300/mm/Makefile new file mode 100644 index 000000000000..508697f0d97c --- /dev/null +++ b/arch/h8300/mm/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for the linux h8300-specific parts of the memory manager. +# + +obj-y := init.o fault.o memory.o diff --git a/arch/h8300/mm/fault.c b/arch/h8300/mm/fault.c new file mode 100644 index 000000000000..5924ff555ded --- /dev/null +++ b/arch/h8300/mm/fault.c @@ -0,0 +1,57 @@ +/* + * linux/arch/h8300/mm/fault.c + * + * Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>, + * Copyright (C) 2000 Lineo, Inc. (www.lineo.com) + * + * Based on: + * + * linux/arch/m68knommu/mm/fault.c + * linux/arch/m68k/mm/fault.c + * + * Copyright (C) 1995 Hamish Macdonald + */ + +#include <linux/mman.h> +#include <linux/mm.h> +#include <linux/kernel.h> +#include <linux/ptrace.h> + +#include <asm/pgtable.h> + +void die(const char *str, struct pt_regs *fp, unsigned long err); + +/* + * This routine handles page faults. It determines the problem, and + * then passes it off to one of the appropriate routines. + * + * error_code: + * bit 0 == 0 means no page found, 1 means protection fault + * bit 1 == 0 means read, 1 means write + * + * If this routine detects a bad access, it returns 1, otherwise it + * returns 0. + */ +asmlinkage int do_page_fault(struct pt_regs *regs, unsigned long address, + unsigned long error_code) +{ +#ifdef DEBUG + pr_debug("regs->sr=%#x, regs->pc=%#lx, address=%#lx, %ld\n", + regs->sr, regs->pc, address, error_code); +#endif + +/* + * Oops. The kernel tried to access some bad page. We'll have to + * terminate things with extreme prejudice. + */ + if ((unsigned long) address < PAGE_SIZE) + pr_alert("Unable to handle kernel NULL pointer dereference"); + else + pr_alert("Unable to handle kernel access"); + printk(" at virtual address %08lx\n", address); + if (!user_mode(regs)) + die("Oops", regs, error_code); + do_exit(SIGKILL); + + return 1; +} 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); +} diff --git a/arch/h8300/mm/memory.c b/arch/h8300/mm/memory.c new file mode 100644 index 000000000000..4974aa40bcb8 --- /dev/null +++ b/arch/h8300/mm/memory.c @@ -0,0 +1,53 @@ +/* + * linux/arch/h8300/mm/memory.c + * + * Copyright (C) 2002 Yoshinori Sato <ysato@users.sourceforge.jp>, + * + * Based on: + * + * linux/arch/m68knommu/mm/memory.c + * + * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>, + * Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com) + * + * Based on: + * + * linux/arch/m68k/mm/memory.c + * + * Copyright (C) 1995 Hamish Macdonald + */ + +#include <linux/mm.h> +#include <linux/kernel.h> +#include <linux/string.h> +#include <linux/types.h> + +#include <asm/setup.h> +#include <asm/segment.h> +#include <asm/page.h> +#include <asm/pgtable.h> +#include <asm/traps.h> +#include <asm/io.h> + +void cache_clear(unsigned long paddr, int len) +{ +} + + +void cache_push(unsigned long paddr, int len) +{ +} + +void cache_push_v(unsigned long vaddr, int len) +{ +} + +/* + * Map some physical address range into the kernel address space. + */ + +unsigned long kernel_map(unsigned long paddr, unsigned long size, + int nocacheflag, unsigned long *memavailp) +{ + return paddr; +} |