arch/arm/mm/proc-arm940.S

Source file repositories/reference/linux-study-clean/arch/arm/mm/proc-arm940.S

File Facts

System
Linux kernel
Corpus path
arch/arm/mm/proc-arm940.S
Extension
.S
Size
9719 bytes
Lines
370
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: arch/arm
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <linux/linkage.h>
#include <linux/init.h>
#include <linux/cfi_types.h>
#include <linux/pgtable.h>
#include <asm/assembler.h>
#include <asm/hwcap.h>
#include <asm/pgtable-hwdef.h>
#include <asm/ptrace.h>
#include "proc-macros.S"

/* ARM940T has a 4KB DCache comprising 256 lines of 4 words */
#define CACHE_DLINESIZE	16
#define CACHE_DSEGMENTS	4
#define CACHE_DENTRIES	64

	.text
/*
 * cpu_arm940_proc_init()
 * cpu_arm940_switch_mm()
 *
 * These are not required.
 */
SYM_TYPED_FUNC_START(cpu_arm940_proc_init)
	ret	lr
SYM_FUNC_END(cpu_arm940_proc_init)

SYM_TYPED_FUNC_START(cpu_arm940_switch_mm)
	ret	lr
SYM_FUNC_END(cpu_arm940_switch_mm)

/*
 * cpu_arm940_proc_fin()
 */
SYM_TYPED_FUNC_START(cpu_arm940_proc_fin)
	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
	bic	r0, r0, #0x00001000		@ i-cache
	bic	r0, r0, #0x00000004		@ d-cache
	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
	ret	lr
SYM_FUNC_END(cpu_arm940_proc_fin)

/*
 * cpu_arm940_reset(loc)
 * Params  : r0 = address to jump to
 * Notes   : This sets up everything for a reset
 */
	.pushsection	.idmap.text, "ax"
SYM_TYPED_FUNC_START(cpu_arm940_reset)
	mov	ip, #0
	mcr	p15, 0, ip, c7, c5, 0		@ flush I cache
	mcr	p15, 0, ip, c7, c6, 0		@ flush D cache
	mcr	p15, 0, ip, c7, c10, 4		@ drain WB
	mrc	p15, 0, ip, c1, c0, 0		@ ctrl register
	bic	ip, ip, #0x00000005		@ .............c.p
	bic	ip, ip, #0x00001000		@ i-cache
	mcr	p15, 0, ip, c1, c0, 0		@ ctrl register
	ret	r0
SYM_FUNC_END(cpu_arm940_reset)
	.popsection

/*
 * cpu_arm940_do_idle()
 */
	.align	5
SYM_TYPED_FUNC_START(cpu_arm940_do_idle)
	mcr	p15, 0, r0, c7, c0, 4		@ Wait for interrupt
	ret	lr
SYM_FUNC_END(cpu_arm940_do_idle)

/*

Annotation

Implementation Notes