mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
56 lines
1.2 KiB
ArmAsm
56 lines
1.2 KiB
ArmAsm
/*
|
|
* This is the analog to the kexec "purgatory" code
|
|
*
|
|
* The goal here is to call the actual kernel entry point with the arguments it
|
|
* expects when kexec calls into it with no arguments. The value of the kernel
|
|
* entry point and arguments r3-r7 are copied into the trampoline text (which
|
|
* can be executed from any address) at bytes 8-32. kexec begins execution
|
|
* of APs at 0x60 bytes past the entry point, executing in a copy relocated
|
|
* to the absolute address 0x60. Here we implement a loop waiting on the release
|
|
* of a lock by the kernel at 0x40.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
|
|
.globl CNAME(kerneltramp),CNAME(szkerneltramp)
|
|
CNAME(kerneltramp):
|
|
mflr %r9
|
|
bl 2f
|
|
.space 24 /* branch address, r3-r7 */
|
|
|
|
. = kerneltramp + 0x40 /* AP spinlock */
|
|
.long 0
|
|
|
|
. = kerneltramp + 0x60 /* AP entry point */
|
|
li %r3,0x40
|
|
1: lwz %r1,0(%r3)
|
|
cmpwi %r1,0
|
|
beq 1b
|
|
|
|
/* Jump into CPU reset */
|
|
li %r0,0x100
|
|
icbi 0,%r0
|
|
isync
|
|
sync
|
|
ba 0x100
|
|
|
|
2: /* Continuation of kerneltramp */
|
|
mflr %r8
|
|
mtlr %r9
|
|
lwz %r3,0(%r8)
|
|
mtctr %r3
|
|
lwz %r3,4(%r8)
|
|
lwz %r4,8(%r8)
|
|
lwz %r5,12(%r8)
|
|
lwz %r6,16(%r8)
|
|
lwz %r7,20(%r8)
|
|
bctr
|
|
|
|
endkerneltramp:
|
|
|
|
.data
|
|
CNAME(szkerneltramp):
|
|
.long endkerneltramp - CNAME(kerneltramp)
|