arch/arm/mach-spear/headsmp.S

Source file repositories/reference/linux-study-clean/arch/arm/mach-spear/headsmp.S

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-spear/headsmp.S
Extension
.S
Size
978 bytes
Lines
45
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>

	__INIT

/*
 * spear13xx specific entry point for secondary CPUs. This provides
 * a "holding pen" into which all secondary cores are held until we're
 * ready for them to initialise.
 */
ENTRY(spear13xx_secondary_startup)
	mrc	p15, 0, r0, c0, c0, 5
	and	r0, r0, #15
	adr	r4, 1f
	ldmia	r4, {r5, r6}
	sub	r4, r4, r5
	add	r6, r6, r4
pen:	ldr	r7, [r6]
	cmp	r7, r0
	bne	pen

	/* re-enable coherency */
	mrc	p15, 0, r0, c1, c0, 1
	orr	r0, r0, #(1 << 6) | (1 << 0)
	mcr	p15, 0, r0, c1, c0, 1
	/*
	 * we've been released from the holding pen: secondary_stack
	 * should now contain the SVC stack for this core
	 */
	b	secondary_startup

	.align
1:	.long	.
	.long	spear_pen_release
ENDPROC(spear13xx_secondary_startup)

Annotation

Implementation Notes