loadmmu.c

一个2.4.21版本的嵌入式linux内核

/*
 * loadmmu.c: Setup cpu/cache specific function ptrs at boot time.
 *
 * Copyright (C) 1996 David S. Miller ([e-mail])
 * 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>

/* memory functions */
void (*_clear_page)(void * page);
void (*_copy_page)(void * to, void * from);

/* 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_cache_sigtramp)(unsigned long addr);
void (*_flush_icache_range)(unsigned long start, unsigned long end);
void (*_flush_icache_page)(struct vm_area_struct *vma, struct page *page);

void (*_flush_page_to_ram)(struct page * page);
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_tx49(void);
extern void ld_mmu_r5432(void);
extern void ld_mmu_r6000(void);
extern void ld_mmu_rm7k(void);
extern void ld_mmu_tfp(void);
extern void ld_mmu_andes(void);
extern void ld_mmu_sb1(void);
extern void ld_mmu_mips32(void);
extern void r3k_tlb_init(void);
extern void r4k_tlb_init(void);
extern void sb1_tlb_init(void);

void __init loadmmu(void)
{
	if (mips_cpu.options & MIPS_CPU_4KTLB) {
#if defined(CONFIG_CPU_R4X00) || defined(CONFIG_CPU_VR41XX) || \
    defined(CONFIG_CPU_R4300) || defined(CONFIG_CPU_R5000) || \
    defined(CONFIG_CPU_NEVADA)
		ld_mmu_r4xx0();
		r4k_tlb_init();
#endif
#if defined(CONFIG_CPU_RM7000)
		ld_mmu_rm7k();
		r4k_tlb_init();
#endif
#if defined(CONFIG_CPU_R5432) || defined(CONFIG_CPU_R5500)
		ld_mmu_r5432();
		r4k_tlb_init();
#endif
#if defined(CONFIG_CPU_TX49XX)
		ld_mmu_tx49();
		r4k_tlb_init();
#endif

#if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64)
		ld_mmu_mips32();
		r4k_tlb_init();
#endif
	} else switch(mips_cpu.cputype) {
#ifdef CONFIG_CPU_R3000
	case CPU_R2000:
	case CPU_R3000:
	case CPU_R3000A:
	case CPU_R3081E:
		ld_mmu_r23000();
		r3k_tlb_init();
		break;
	case CPU_TX3912:
	case CPU_TX3922:
	case CPU_TX3927:
	case CPU_TX39XX:
		ld_mmu_tx39();
		r3k_tlb_init();
		break;
#endif
#ifdef CONFIG_CPU_TX39XX
	case CPU_TX3912:
	case CPU_TX3922:
	case CPU_TX3927:
	case CPU_TX39XX:
		ld_mmu_tx39();
		r3k_tlb_init();
		break;
#endif
#ifdef CONFIG_CPU_R10000
	case CPU_R10000:
	case CPU_R12000:
		ld_mmu_andes();
		r4k_tlb_init();
		break;
#endif
#ifdef CONFIG_CPU_SB1
	case CPU_SB1:
		ld_mmu_sb1();
		sb1_tlb_init();
		break;
#endif
	default:
		panic("Yeee, unsupported mmu/cache architecture.");
	}
}