loadmmu.c

linux-2.4.29操作系统的源码

/*
 * 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.
 *
 * Copyright (C) 1996 David S. Miller ([e-mail])
 * Copyright (C) 1997, 1999, 2000, 2001, 2002, 2003 Ralf Baechle ([e-mail])
 * Copyright (C) 1999 Silicon Graphics, Inc.
 * Kevin D. Kissell, [e-mail] and Carsten Langgaard, [e-mail]
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/config.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/module.h>

#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/system.h>

/* Cache operations. */
void (*_flush_cache_all)(void);
void (*___flush_cache_all)(void);
void (*_flush_cache_mm)(struct mm_struct *mm);
void (*_flush_cache_range)(struct mm_struct *mm, unsigned long start,
	unsigned long end);
void (*_flush_cache_page)(struct vm_area_struct *vma, unsigned long page);
void (*_flush_icache_range)(unsigned long start, unsigned long end);
void (*_flush_icache_page)(struct vm_area_struct *vma, struct page *page);

void (*_flush_cache_sigtramp)(unsigned long addr);
void (*_flush_data_cache_page)(unsigned long addr);
void (*_flush_icache_all)(void);

#ifdef CONFIG_NONCOHERENT_IO

/* DMA cache operations. */
void (*_dma_cache_wback_inv)(unsigned long start, unsigned long size);
void (*_dma_cache_wback)(unsigned long start, unsigned long size);
void (*_dma_cache_inv)(unsigned long start, unsigned long size);

EXPORT_SYMBOL(_dma_cache_wback_inv);
EXPORT_SYMBOL(_dma_cache_wback);
EXPORT_SYMBOL(_dma_cache_inv);

#endif /* CONFIG_NONCOHERENT_IO */

extern void ld_mmu_r23000(void);
extern void ld_mmu_r4xx0(void);
extern void ld_mmu_tx39(void);
extern void ld_mmu_r6000(void);
extern void ld_mmu_tfp(void);
extern void ld_mmu_andes(void);
extern void ld_mmu_sb1(void);
extern void sb1_tlb_init(void);
extern void r3k_tlb_init(void);
extern void r4k_tlb_init(void);
extern void sb1_tlb_init(void);

void __init load_mmu(void)
{
	if (cpu_has_4ktlb) {
#if defined(CONFIG_CPU_R4X00)  || defined(CONFIG_CPU_VR41XX) || \
    defined(CONFIG_CPU_R4300)  || defined(CONFIG_CPU_R5000)  || \
    defined(CONFIG_CPU_NEVADA) || defined(CONFIG_CPU_R5432)  || \
    defined(CONFIG_CPU_R5500)  || defined(CONFIG_CPU_MIPS32) || \
    defined(CONFIG_CPU_MIPS64) || defined(CONFIG_CPU_TX49XX) || \
    defined(CONFIG_CPU_RM7000) || defined(CONFIG_CPU_RM9000)
		ld_mmu_r4xx0();
		r4k_tlb_init();
#endif
	} else switch (current_cpu_data.cputype) {
#ifdef CONFIG_CPU_R3000
	case CPU_R2000:
	case CPU_R3000:
	case CPU_R3000A:
	case CPU_R3081E:
		ld_mmu_r23000();
		r3k_tlb_init();
		break;
#endif
#ifdef CONFIG_CPU_TX39XX
	case CPU_TX3912:
	case CPU_TX3922:
	case CPU_TX3927:
		ld_mmu_tx39();
		r3k_tlb_init();
		break;
#endif
#ifdef CONFIG_CPU_R10000
	case CPU_R10000:
	case CPU_R12000:
		ld_mmu_r4xx0();
		andes_tlb_init();
		break;
#endif
#ifdef CONFIG_CPU_SB1
	case CPU_SB1:
		ld_mmu_sb1();
		sb1_tlb_init();
		break;
#endif

	case CPU_R8000:
		panic("R8000 is unsupported");
		break;

	default:
		panic("Yeee, unsupported mmu/cache architecture.");
	}
}