projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| c587e4a6 RP |
1 | /* |
| 2 | * relocate_kernel.S - put the kernel image in place to boot | |
| 3 | */ | |
| 4 | ||
| e2ccba49 | 5 | #include <linux/linkage.h> |
| 6ebbf2ce | 6 | #include <asm/assembler.h> |
| c587e4a6 RP |
7 | #include <asm/kexec.h> |
| 8 | ||
| e2ccba49 DM |
9 | .align 3 /* not needed for this code, but keeps fncpy() happy */ |
| 10 | ||
| 11 | ENTRY(relocate_new_kernel) | |
| c587e4a6 RP |
12 | |
| 13 | ldr r0,kexec_indirection_page | |
| 14 | ldr r1,kexec_start_address | |
| 15 | ||
| 8594a0c3 MW |
16 | /* |
| 17 | * If there is no indirection page (we are doing crashdumps) | |
| 18 | * skip any relocation. | |
| 19 | */ | |
| 20 | cmp r0, #0 | |
| 21 | beq 2f | |
| c587e4a6 RP |
22 | |
| 23 | 0: /* top, read another word for the indirection page */ | |
| 24 | ldr r3, [r0],#4 | |
| 25 | ||
| 26 | /* Is it a destination page. Put destination address to r4 */ | |
| 27 | tst r3,#1,0 | |
| 28 | beq 1f | |
| 29 | bic r4,r3,#1 | |
| 30 | b 0b | |
| 31 | 1: | |
| 32 | /* Is it an indirection page */ | |
| 33 | tst r3,#2,0 | |
| 34 | beq 1f | |
| 35 | bic r0,r3,#2 | |
| 36 | b 0b | |
| 37 | 1: | |
| 38 | ||
| 39 | /* are we done ? */ | |
| 40 | tst r3,#4,0 | |
| 41 | beq 1f | |
| 42 | b 2f | |
| 43 | ||
| 44 | 1: | |
| 45 | /* is it source ? */ | |
| 46 | tst r3,#8,0 | |
| 47 | beq 0b | |
| 48 | bic r3,r3,#8 | |
| 49 | mov r6,#1024 | |
| 50 | 9: | |
| 51 | ldr r5,[r3],#4 | |
| 52 | str r5,[r4],#4 | |
| 53 | subs r6,r6,#1 | |
| 54 | bne 9b | |
| 55 | b 0b | |
| 56 | ||
| 57 | 2: | |
| 58 | /* Jump to relocated kernel */ | |
| 59 | mov lr,r1 | |
| 60 | mov r0,#0 | |
| 61 | ldr r1,kexec_mach_type | |
| 4cd9d6f7 | 62 | ldr r2,kexec_boot_atags |
| 6ebbf2ce | 63 | ARM( ret lr ) |
| 552e0c8d | 64 | THUMB( bx lr ) |
| c587e4a6 | 65 | |
| bc8b57f0 DM |
66 | .align |
| 67 | ||
| c587e4a6 RP |
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 | .globl kexec_mach_type | |
| 77 | kexec_mach_type: | |
| 78 | .long 0x0 | |
| 79 | ||
| 4cd9d6f7 RP |
80 | /* phy addr of the atags for the new kernel */ |
| 81 | .globl kexec_boot_atags | |
| 82 | kexec_boot_atags: | |
| 033b8ffe MW |
83 | .long 0x0 |
| 84 | ||
| e2ccba49 DM |
85 | ENDPROC(relocate_new_kernel) |
| 86 | ||
| c587e4a6 RP |
87 | relocate_new_kernel_end: |
| 88 | ||
| 89 | .globl relocate_new_kernel_size | |
| 90 | relocate_new_kernel_size: | |
| 91 | .long relocate_new_kernel_end - relocate_new_kernel | |
| 92 | ||
| 93 |