www.pudn.com > mizi_vivi.rar > mmu.c


/*
 * mmu-pxa250.c
 *
 * Copyright (C) 2001 MIZI Research, Inc.
 *
 * Author: Yong-iL Joh 
 * Date  : $Date: 2002/08/02 05:12:42 $ 
 *
 * $Revision: 1.8 $
 *
   Note:
     - mmu_init()에서 putstr()과 같은 출력문을 사용하지 마세요.

   Mon May 28 2002 Yong-iL Joh 
   - initial based on mmu-s3c2400.c

   Mon Jul 22 2002 Janghoon Lyu 
   - 새로 작성합니다.

 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 */

#include "config.h"
#include "machine.h"
#include "mmu.h"
#include "vivi_string.h"

static unsigned long *mmu_tlb_base = (unsigned long *)MMU_TABLE_BASE;

extern void cpu_xscale_cache_clean_invalidate_all(void);
extern void cpu_xscale_tlb_invalidate_all(void);
extern void __xscale_setup(void);

void cache_clean_invalidate(void) {
	cpu_xscale_cache_clean_invalidate_all();
}

void tlb_invalidate(void) {
	cpu_xscale_tlb_invalidate_all();
}

void mmu_init(void) {
    __xscale_setup();
}

static inline void mem_mapping_linear(void)
{
    unsigned long pageoffset, sectionNumber;

#ifdef CONFIG_DEBUG
    putstr_hex("mmu table base address = 0x", (unsigned long)mmu_tlb_base);
#endif
    /* 4G 영역을 1:1로 매핑. not cacacheable, not bufferable */
    for (sectionNumber = 0; sectionNumber < 4096; sectionNumber++) {
      pageoffset = (sectionNumber << 20);
      (*(volatile unsigned long *)(mmu_tlb_base + (pageoffset >> 20)))
	= pageoffset | MMU_SECDESC;
    }

    /* make dram cacheable */
    for (pageoffset = DRAM_BASE;
	 pageoffset < (DRAM_BASE+DRAM_SIZE);
	 pageoffset += SZ_1M) {
      (*(volatile unsigned long *)(mmu_tlb_base + (pageoffset >> 20)))
	= pageoffset | MMU_SECDESC | MMU_CACHEABLE; 
    }
}

static inline void nor_flash_mapping(void)
{
    unsigned long cached_addr = FLASH_BASE;
    unsigned long uncached_addr = FLASH_UNCACHED_BASE;

    /* Make flash cacheable */
    for (cached_addr = FLASH_BASE, uncached_addr = FLASH_UNCACHED_BASE;
	 cached_addr < (FLASH_BASE + FLASH_SIZE);
	 cached_addr += SZ_1M, uncached_addr += SZ_1M) {
      (*(volatile unsigned long *)(mmu_tlb_base + (cached_addr >> 20)))
	= cached_addr | MMU_SECDESC | MMU_CACHEABLE;
      (*(volatile unsigned long *)(mmu_tlb_base + (uncached_addr >> 20)))
	= cached_addr | MMU_SECDESC;
    }
}

static void nor_flash_remapping(void)
{
#ifdef CONFIG_DEBUG
    putstr_hex("Map Flash virtual section to DRAM at 0x", VIVI_RAM_BASE);
#endif
    /* point first 1MB of flash virtual addresses
       to its cacheable image in DRAM */
    (*(volatile unsigned long *)(mmu_tlb_base + (FLASH_UNCACHED_BASE >> 20)))
      = VIVI_ROM_BASE | MMU_SECDESC;
    (*(volatile unsigned long *)(mmu_tlb_base + (VIVI_ROM_BASE >> 20)))
      = VIVI_RAM_BASE | MMU_SECDESC | MMU_CACHEABLE;
}

static void copy_vivi_to_ram(void)
{
#ifdef CONFIG_DEBUG
	putstr_hex("Evacuating 1MB of Flash to DRAM at 0x", VIVI_RAM_BASE);
#endif
	memcpy((void *)VIVI_RAM_BASE, (void *)VIVI_ROM_BASE, VIVI_RAM_SIZE);
}

void mem_map_init(void)
{
	copy_vivi_to_ram();
	mem_mapping_linear();
	nor_flash_mapping();
	nor_flash_remapping();
	cache_clean_invalidate();
	tlb_invalidate();
}

/*
 | $Id: mmu.c,v 1.8 2002/08/02 05:12:42 tolkien Exp $
 |
 | Local Variables:
 | mode: c
 | mode: font-lock
 | version-control: t
 | delete-old-versions: t
 | End:
 |
 | -*- End-Of-File -*-
 */