arch/arm/boot/compressed/head-xscale.S

Source file repositories/reference/linux-study-clean/arch/arm/boot/compressed/head-xscale.S

File Facts

System
Linux kernel
Corpus path
arch/arm/boot/compressed/head-xscale.S
Extension
.S
Size
916 bytes
Lines
36
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>

		.section        ".start", "ax"

__XScale_start:

		@ Preserve r8/r7 i.e. kernel entry values

		@ Data cache might be active.
		@ Be sure to flush kernel binary out of the cache,
		@ whatever state it is, before it is turned off.
		@ This is done by fetching through currently executed
		@ memory to be sure we hit the same cache.
		bic	r2, pc, #0x1f
		add	r3, r2, #0x10000	@ 64 kb is quite enough...
1:		ldr	r0, [r2], #32
		teq	r2, r3
		bne	1b
		mcr	p15, 0, r0, c7, c10, 4	@ drain WB
		mcr	p15, 0, r0, c7, c7, 0	@ flush I & D caches

		@ disabling MMU and caches
		mrc	p15, 0, r0, c1, c0, 0	@ read control reg
		bic	r0, r0, #0x05		@ clear DC, MMU
		bic	r0, r0, #0x1000		@ clear Icache
		mcr	p15, 0, r0, c1, c0, 0

Annotation

Implementation Notes