arch/arm/mm/proc-v6.S

Source file repositories/reference/linux-study-clean/arch/arm/mm/proc-v6.S

File Facts

System
Linux kernel
Corpus path
arch/arm/mm/proc-v6.S
Extension
.S
Size
8661 bytes
Lines
307
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/init.h>
#include <linux/cfi_types.h>
#include <linux/linkage.h>
#include <linux/pgtable.h>
#include <asm/assembler.h>
#include <asm/asm-offsets.h>
#include <asm/hwcap.h>
#include <asm/pgtable-hwdef.h>

#include "proc-macros.S"

#define D_CACHE_LINE_SIZE	32

#define TTB_C		(1 << 0)
#define TTB_S		(1 << 1)
#define TTB_IMP		(1 << 2)
#define TTB_RGN_NC	(0 << 3)
#define TTB_RGN_WBWA	(1 << 3)
#define TTB_RGN_WT	(2 << 3)
#define TTB_RGN_WB	(3 << 3)

#define TTB_FLAGS_UP	TTB_RGN_WBWA
#define PMD_FLAGS_UP	PMD_SECT_WB
#define TTB_FLAGS_SMP	TTB_RGN_WBWA|TTB_S
#define PMD_FLAGS_SMP	PMD_SECT_WBWA|PMD_SECT_S

.arch armv6

SYM_TYPED_FUNC_START(cpu_v6_proc_init)
	ret	lr
SYM_FUNC_END(cpu_v6_proc_init)

SYM_TYPED_FUNC_START(cpu_v6_proc_fin)
	mrc	p15, 0, r0, c1, c0, 0		@ ctrl register
	bic	r0, r0, #0x1000			@ ...i............
	bic	r0, r0, #0x0006			@ .............ca.
	mcr	p15, 0, r0, c1, c0, 0		@ disable caches
	ret	lr
SYM_FUNC_END(cpu_v6_proc_fin)

/*
 *	cpu_v6_reset(loc)
 *
 *	Perform a soft reset of the system.  Put the CPU into the
 *	same state as it would be if it had been reset, and branch
 *	to what would be the reset vector.
 *
 *	- loc   - location to jump to for soft reset
 */
	.align	5
	.pushsection	.idmap.text, "ax"
SYM_TYPED_FUNC_START(cpu_v6_reset)
	mrc	p15, 0, r1, c1, c0, 0		@ ctrl register
	bic	r1, r1, #0x1			@ ...............m
	mcr	p15, 0, r1, c1, c0, 0		@ disable MMU
	mov	r1, #0
	mcr	p15, 0, r1, c7, c5, 4		@ ISB
	ret	r0
SYM_FUNC_END(cpu_v6_reset)
	.popsection

/*
 *	cpu_v6_do_idle()
 *
 *	Idle the processor (eg, wait for interrupt).
 *
 *	IRQs are already disabled.
 */
SYM_TYPED_FUNC_START(cpu_v6_do_idle)
	mov	r1, #0

Annotation

Implementation Notes