arch/sparc/kernel/head_64.S

Source file repositories/reference/linux-study-clean/arch/sparc/kernel/head_64.S

File Facts

System
Linux kernel
Corpus path
arch/sparc/kernel/head_64.S
Extension
.S
Size
23519 bytes
Lines
970
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: exported/initcall integration point
Status
integration implementation candidate

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/version.h>
#include <linux/errno.h>
#include <linux/export.h>
#include <linux/threads.h>
#include <linux/init.h>
#include <linux/linkage.h>
#include <linux/pgtable.h>
#include <asm/thread_info.h>
#include <asm/asi.h>
#include <asm/pstate.h>
#include <asm/ptrace.h>
#include <asm/spitfire.h>
#include <asm/page.h>
#include <asm/errno.h>
#include <asm/signal.h>
#include <asm/processor.h>
#include <asm/lsu.h>
#include <asm/dcr.h>
#include <asm/dcu.h>
#include <asm/head.h>
#include <asm/ttable.h>
#include <asm/mmu.h>
#include <asm/cpudata.h>
#include <asm/pil.h>
#include <asm/estate.h>
#include <asm/sfafsr.h>
#include <asm/unistd.h>

/* This section from from _start to sparc64_boot_end should fit into
 * 0x0000000000404000 to 0x0000000000408000.
 */
	.text
	.globl	start, _start, stext, _stext
_start:
start:
_stext:
stext:
! 0x0000000000404000
	b	sparc64_boot
	 flushw					/* Flush register file.      */

/* This stuff has to be in sync with SILO and other potential boot loaders
 * Fields should be kept upward compatible and whenever any change is made,
 * HdrS version should be incremented.
 */
        .global root_flags, ram_flags, root_dev
        .global sparc_ramdisk_image, sparc_ramdisk_size
	.global sparc_ramdisk_image64

        .ascii  "HdrS"
        .word   LINUX_VERSION_CODE

	/* History:
	 *
	 * 0x0300 : Supports being located at other than 0x4000
	 * 0x0202 : Supports kernel params string
	 * 0x0201 : Supports reboot_command
	 */
	.half   0x0301          /* HdrS version */

root_flags:
        .half   1
root_dev:
        .half   0
ram_flags:
        .half   0
sparc_ramdisk_image:
        .word   0
sparc_ramdisk_size:
        .word   0

Annotation

Implementation Notes