arch/arm/mach-socfpga/headsmp.S

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

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-socfpga/headsmp.S
Extension
.S
Size
800 bytes
Lines
34
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 <asm/page.h>
#include <asm/assembler.h>

	.arch	armv7-a
	.arm

ENTRY(secondary_trampoline)
	/* CPU1 will always fetch from 0x0 when it is brought out of reset.
	 * Thus, we can just subtract the PAGE_OFFSET to get the physical
	 * address of &cpu1start_addr. This would not work for platforms
	 * where the physical memory does not start at 0x0.
	*/
ARM_BE8(setend	be)
	adr	r0, 1f
	ldmia	r0, {r1, r2}
	sub	r2, r2, #PAGE_OFFSET
	ldr	r3, [r2]
	ldr	r4, [r3]
ARM_BE8(rev	r4, r4)
	bx	r4

	.align
1:	.long	.
	.long	socfpga_cpu1start_addr
ENTRY(secondary_trampoline_end)

Annotation

Implementation Notes