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 17LEAF(relocate_new_kernel) 18 PTR_L s0, kexec_indirection_page 19 PTR_L s1, kexec_start_address 20 21process_entry: 22 PTR_L s2, (s0) 23 PTR_ADD s0, s0, SZREG 24 25 /* destination page */ 26 and s3, s2, 0x1 27 beq s3, zero, 1f 28 and s4, s2, ~0x1 /* store destination addr in s4 */ 29 move a0, s4 30 b process_entry 31 321: 33 /* indirection page, update s0 */ 34 and s3, s2, 0x2 35 beq s3, zero, 1f 36 and s0, s2, ~0x2 37 b process_entry 38 391: 40 /* done page */ 41 and s3, s2, 0x4 42 beq s3, zero, 1f 43 b done 441: 45 /* source page */ 46 and s3, s2, 0x8 47 beq s3, zero, process_entry 48 and s2, s2, ~0x8 49 li s6, (1 << PAGE_SHIFT) / SZREG 50 51copy_word: 52 /* copy page word by word */ 53 REG_L s5, (s2) 54 REG_S s5, (s4) 55 PTR_ADD s4, s4, SZREG 56 PTR_ADD s2, s2, SZREG 57 LONG_SUB s6, s6, 1 58 beq s6, zero, process_entry 59 b copy_word 60 b process_entry 61 62done: 63 /* jump to kexec_start_address */ 64 j s1 65 END(relocate_new_kernel) 66 67kexec_start_address: 68 EXPORT(kexec_start_address) 69 PTR 0x0 70 .size kexec_start_address, PTRSIZE 71 72kexec_indirection_page: 73 EXPORT(kexec_indirection_page) 74 PTR 0 75 .size kexec_indirection_page, PTRSIZE 76 77relocate_new_kernel_end: 78 79relocate_new_kernel_size: 80 EXPORT(relocate_new_kernel_size) 81 PTR relocate_new_kernel_end - relocate_new_kernel 82 .size relocate_new_kernel_size, PTRSIZE 83