arch/arm/mach-imx/headsmp.S

File Facts

System

Linux kernel

Corpus path

arch/arm/mach-imx/headsmp.S

Extension

.S

Size

746 bytes

Lines

38

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.

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

Dependency Surface

• linux/linkage.h
• linux/init.h
• asm/assembler.h

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

#include <linux/linkage.h>
#include <linux/init.h>
#include <asm/assembler.h>

.arch armv7-a

diag_reg_offset:
	.word	g_diag_reg - .

	.macro	set_diag_reg
	adr	r0, diag_reg_offset
	ldr	r1, [r0]
	add	r1, r1, r0		@ r1 = physical &g_diag_reg
	ldr	r0, [r1]
	mcr	p15, 0, r0, c15, c0, 1	@ write diagnostic register
	.endm

ENTRY(v7_secondary_startup)
ARM_BE8(setend be)			@ go BE8 if entered LE
	mrc	p15, 0, r0, c0, c0, 0
	lsl	r0, r0, #16
	lsr	r0, r0, #20
	/* 0xc07 is cortex A7's ID */
	mov	r1, #0xc00
	orr	r1, #0x7
	cmp	r0, r1
	beq	secondary_startup

	set_diag_reg
	b	secondary_startup
ENDPROC(v7_secondary_startup)

Annotation

• Immediate include surface: `linux/linkage.h`, `linux/init.h`, `asm/assembler.h`.
• Atlas domain: Architecture Layer / arch/arm.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.