1/* 2 * relocate_kernel.S for kexec 3 * Created by <nschichan@corp.free.fr> on Thu Oct 12 17:49:57 2006 4 * 5 * This source code is licensed under the GNU General Public License, 6 * Version 2. See the file COPYING for more details. 7 */ 8 9#include <asm/asm.h> 10#include <asm/asmmacro.h> 11#include <asm/regdef.h> 12#include <asm/page.h> 13#include <asm/mipsregs.h> 14#include <asm/stackframe.h> 15#include <asm/addrspace.h> 16 17 .globl relocate_new_kernel 18relocate_new_kernel: 19 20 PTR_L s0, kexec_indirection_page 21 PTR_L s1, kexec_start_address 22 23process_entry: 24 PTR_L s2, (s0) 25 PTR_ADD s0, s0, SZREG 26 27 /* destination page */ 28 and s3, s2, 0x1 29 beq s3, zero, 1f 30 and s4, s2, ~0x1 /* store destination addr in s4 */ 31 move a0, s4 32 b process_entry 33 341: 35 /* indirection page, update s0 */ 36 and s3, s2, 0x2 37 beq s3, zero, 1f 38 and s0, s2, ~0x2 39 b process_entry 40 411: 42 /* done page */ 43 and s3, s2, 0x4 44 beq s3, zero, 1f 45 b done 461: 47 /* source page */ 48 and s3, s2, 0x8 49 beq s3, zero, process_entry 50 and s2, s2, ~0x8 51 li s6, (1 << PAGE_SHIFT) / SZREG 52 53copy_word: 54 /* copy page word by word */ 55 REG_L s5, (s2) 56 REG_S s5, (s4) 57 INT_ADD s4, s4, SZREG 58 INT_ADD s2, s2, SZREG 59 INT_SUB s6, s6, 1 60 beq s6, zero, process_entry 61 b copy_word 62 b process_entry 63 64done: 65 /* jump to kexec_start_address */ 66 j s1 67 68 .globl kexec_start_address 69kexec_start_address: 70 .long 0x0 71 72 .globl kexec_indirection_page 73kexec_indirection_page: 74 .long 0x0 75 76relocate_new_kernel_end: 77 78 .globl relocate_new_kernel_size 79relocate_new_kernel_size: 80 .long relocate_new_kernel_end - relocate_new_kernel 81