h8300: Memory management

#

# Makefile for the linux h8300-specific parts of the memory manager.

#

obj-y	 := init.o fault.o memory.o

/*

 *  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;

}

/*

 *  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);

}

/*

 *  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;

}