| Nicolas Schichan | 583bb86 | 2006-10-18 15:14:55 +0200 | [diff] [blame] | 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 |
| 18 | relocate_new_kernel: |
| 19 | |
| 20 | PTR_L s0, kexec_indirection_page |
| 21 | PTR_L s1, kexec_start_address |
| 22 | |
| 23 | process_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 | |
| 34 | 1: |
| 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 | |
| 41 | 1: |
| 42 | /* done page */ |
| 43 | and s3, s2, 0x4 |
| 44 | beq s3, zero, 1f |
| 45 | b done |
| 46 | 1: |
| 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 | |
| 53 | copy_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 | |
| 64 | done: |
| 65 | /* jump to kexec_start_address */ |
| 66 | j s1 |
| 67 | |
| 68 | .globl kexec_start_address |
| 69 | kexec_start_address: |
| 70 | .long 0x0 |
| 71 | |
| 72 | .globl kexec_indirection_page |
| 73 | kexec_indirection_page: |
| 74 | .long 0x0 |
| 75 | |
| 76 | relocate_new_kernel_end: |
| 77 | |
| 78 | .globl relocate_new_kernel_size |
| 79 | relocate_new_kernel_size: |
| 80 | .long relocate_new_kernel_end - relocate_new_kernel |