129 lines
2.9 KiB
ArmAsm
129 lines
2.9 KiB
ArmAsm
/*
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* kexec trampoline
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*
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* Based on code taken from kexec-tools and kexec-lite.
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*
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* Copyright (C) 2004 - 2005, Milton D Miller II, IBM Corporation
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* Copyright (C) 2006, Mohan Kumar M, IBM Corporation
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* Copyright (C) 2013, Anton Blanchard, IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free
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* Software Foundation (version 2 of the License).
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*/
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#if defined(__LITTLE_ENDIAN__)
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#define STWX_BE stwbrx
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#define LWZX_BE lwbrx
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#elif defined(__BIG_ENDIAN__)
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#define STWX_BE stwx
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#define LWZX_BE lwzx
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#else
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#error no endianness defined!
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#endif
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.machine ppc64
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.balign 256
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.globl purgatory_start
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purgatory_start:
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b master
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/* ABI: possible run_at_load flag at 0x5c */
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.org purgatory_start + 0x5c
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.globl run_at_load
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run_at_load:
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.long 0
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.size run_at_load, . - run_at_load
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/* ABI: slaves start at 60 with r3=phys */
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.org purgatory_start + 0x60
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slave:
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b .
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/* ABI: end of copied region */
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.org purgatory_start + 0x100
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.size purgatory_start, . - purgatory_start
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/*
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* The above 0x100 bytes at purgatory_start are replaced with the
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* code from the kernel (or next stage) by setup_purgatory().
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*/
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master:
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or %r1,%r1,%r1 /* low priority to let other threads catchup */
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isync
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mr %r17,%r3 /* save cpu id to r17 */
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mr %r15,%r4 /* save physical address in reg15 */
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or %r3,%r3,%r3 /* ok now to high priority, lets boot */
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lis %r6,0x1
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mtctr %r6 /* delay a bit for slaves to catch up */
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bdnz . /* before we overwrite 0-100 again */
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bl 0f /* Work out where we're running */
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0: mflr %r18
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/* load device-tree address */
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ld %r3, (dt_offset - 0b)(%r18)
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mr %r16,%r3 /* save dt address in reg16 */
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li %r4,20
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LWZX_BE %r6,%r3,%r4 /* fetch __be32 version number at byte 20 */
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cmpwi %cr0,%r6,2 /* v2 or later? */
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blt 1f
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li %r4,28
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STWX_BE %r17,%r3,%r4 /* Store my cpu as __be32 at byte 28 */
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1:
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/* load the kernel address */
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ld %r4,(kernel - 0b)(%r18)
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/* load the run_at_load flag */
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/* possibly patched by kexec */
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ld %r6,(run_at_load - 0b)(%r18)
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/* and patch it into the kernel */
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stw %r6,(0x5c)(%r4)
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mr %r3,%r16 /* restore dt address */
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li %r5,0 /* r5 will be 0 for kernel */
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mfmsr %r11
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andi. %r10,%r11,1 /* test MSR_LE */
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bne .Little_endian
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mtctr %r4 /* prepare branch to */
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bctr /* start kernel */
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.Little_endian:
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mtsrr0 %r4 /* prepare branch to */
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clrrdi %r11,%r11,1 /* clear MSR_LE */
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mtsrr1 %r11
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rfid /* update MSR and start kernel */
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.balign 8
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.globl kernel
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kernel:
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.8byte 0x0
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.size kernel, . - kernel
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.balign 8
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.globl dt_offset
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dt_offset:
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.8byte 0x0
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.size dt_offset, . - dt_offset
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.data
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.balign 8
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.globl purgatory_sha256_digest
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purgatory_sha256_digest:
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.skip 32
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.size purgatory_sha256_digest, . - purgatory_sha256_digest
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.balign 8
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.globl purgatory_sha_regions
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purgatory_sha_regions:
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.skip 8 * 2 * 16
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.size purgatory_sha_regions, . - purgatory_sha_regions
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