projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| b886d83c | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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2 | /* |
| 3 | * kexec trampoline | |
| 4 | * | |
| 5 | * Based on code taken from kexec-tools and kexec-lite. | |
| 6 | * | |
| 7 | * Copyright (C) 2004 - 2005, Milton D Miller II, IBM Corporation | |
| 8 | * Copyright (C) 2006, Mohan Kumar M, IBM Corporation | |
| 9 | * Copyright (C) 2013, Anton Blanchard, IBM Corporation | |
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10 | */ |
| 11 | ||
| ec0c464c | 12 | #include <asm/asm-compat.h> |
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13 | |
| 14 | .machine ppc64 | |
| 15 | .balign 256 | |
| 16 | .globl purgatory_start | |
| 17 | purgatory_start: | |
| 18 | b master | |
| 19 | ||
| 20 | /* ABI: possible run_at_load flag at 0x5c */ | |
| 21 | .org purgatory_start + 0x5c | |
| 22 | .globl run_at_load | |
| 23 | run_at_load: | |
| 24 | .long 0 | |
| 25 | .size run_at_load, . - run_at_load | |
| 26 | ||
| 27 | /* ABI: slaves start at 60 with r3=phys */ | |
| 28 | .org purgatory_start + 0x60 | |
| 29 | slave: | |
| 30 | b . | |
| 31 | /* ABI: end of copied region */ | |
| 32 | .org purgatory_start + 0x100 | |
| 33 | .size purgatory_start, . - purgatory_start | |
| 34 | ||
| 35 | /* | |
| 36 | * The above 0x100 bytes at purgatory_start are replaced with the | |
| 37 | * code from the kernel (or next stage) by setup_purgatory(). | |
| 38 | */ | |
| 39 | ||
| 40 | master: | |
| 41 | or %r1,%r1,%r1 /* low priority to let other threads catchup */ | |
| 42 | isync | |
| 43 | mr %r17,%r3 /* save cpu id to r17 */ | |
| 44 | mr %r15,%r4 /* save physical address in reg15 */ | |
| 45 | ||
| 46 | or %r3,%r3,%r3 /* ok now to high priority, lets boot */ | |
| 47 | lis %r6,0x1 | |
| 48 | mtctr %r6 /* delay a bit for slaves to catch up */ | |
| 49 | bdnz . /* before we overwrite 0-100 again */ | |
| 50 | ||
| 51 | bl 0f /* Work out where we're running */ | |
| 52 | 0: mflr %r18 | |
| 53 | ||
| 54 | /* load device-tree address */ | |
| 55 | ld %r3, (dt_offset - 0b)(%r18) | |
| 56 | mr %r16,%r3 /* save dt address in reg16 */ | |
| 57 | li %r4,20 | |
| 58 | LWZX_BE %r6,%r3,%r4 /* fetch __be32 version number at byte 20 */ | |
| 8a583c0a | 59 | cmpwi %cr0,%r6,2 /* v2 or later? */ |
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60 | blt 1f |
| 61 | li %r4,28 | |
| 62 | STWX_BE %r17,%r3,%r4 /* Store my cpu as __be32 at byte 28 */ | |
| 63 | 1: | |
| 64 | /* load the kernel address */ | |
| 65 | ld %r4,(kernel - 0b)(%r18) | |
| 66 | ||
| 67 | /* load the run_at_load flag */ | |
| 68 | /* possibly patched by kexec */ | |
| 69 | ld %r6,(run_at_load - 0b)(%r18) | |
| 70 | /* and patch it into the kernel */ | |
| 71 | stw %r6,(0x5c)(%r4) | |
| 72 | ||
| 73 | mr %r3,%r16 /* restore dt address */ | |
| 74 | ||
| 75 | li %r5,0 /* r5 will be 0 for kernel */ | |
| 76 | ||
| 77 | mfmsr %r11 | |
| 78 | andi. %r10,%r11,1 /* test MSR_LE */ | |
| 79 | bne .Little_endian | |
| 80 | ||
| 81 | mtctr %r4 /* prepare branch to */ | |
| 82 | bctr /* start kernel */ | |
| 83 | ||
| 84 | .Little_endian: | |
| 85 | mtsrr0 %r4 /* prepare branch to */ | |
| 86 | ||
| 87 | clrrdi %r11,%r11,1 /* clear MSR_LE */ | |
| 88 | mtsrr1 %r11 | |
| 89 | ||
| 90 | rfid /* update MSR and start kernel */ | |
| 91 | ||
| 92 | ||
| 93 | .balign 8 | |
| 94 | .globl kernel | |
| 95 | kernel: | |
| eb039161 | 96 | .8byte 0x0 |
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97 | .size kernel, . - kernel |
| 98 | ||
| 99 | .balign 8 | |
| 100 | .globl dt_offset | |
| 101 | dt_offset: | |
| eb039161 | 102 | .8byte 0x0 |
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103 | .size dt_offset, . - dt_offset |
| 104 | ||
| 105 | ||
| 106 | .data | |
| 107 | .balign 8 | |
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108 | .globl purgatory_sha256_digest |
| 109 | purgatory_sha256_digest: | |
| 0d976313 | 110 | .skip 32 |
| 40c50c1f | 111 | .size purgatory_sha256_digest, . - purgatory_sha256_digest |
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112 | |
| 113 | .balign 8 | |
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114 | .globl purgatory_sha_regions |
| 115 | purgatory_sha_regions: | |
| 0d976313 | 116 | .skip 8 * 2 * 16 |
| 40c50c1f | 117 | .size purgatory_sha_regions, . - purgatory_sha_regions |