97 lines
1.7 KiB
ArmAsm
97 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Purgatory setup code
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*
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* Copyright IBM Corp. 2018
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*
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* Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
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*/
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#include <linux/linkage.h>
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#include <asm/asm-offsets.h>
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#include <asm/page.h>
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#include <asm/sigp.h>
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/* The purgatory is the code running between two kernels. It's main purpose
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* is to verify that the next kernel was not corrupted after load and to
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* start it.
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*/
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.macro START_NEXT_KERNEL base
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lg %r4,kernel_entry-\base(%r13)
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lg %r5,load_psw_mask-\base(%r13)
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ogr %r4,%r5
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stg %r4,0(%r0)
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xgr %r0,%r0
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diag %r0,%r0,0x308
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.endm
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.text
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.align PAGE_SIZE
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ENTRY(purgatory_start)
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/* The purgatory might be called after a diag308 so better set
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* architecture and addressing mode.
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*/
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lhi %r1,1
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sigp %r1,%r0,SIGP_SET_ARCHITECTURE
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sam64
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larl %r5,gprregs
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stmg %r6,%r15,0(%r5)
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basr %r13,0
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.base_crash:
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/* Setup stack */
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larl %r15,purgatory_end
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aghi %r15,-160
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.do_checksum_verification:
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brasl %r14,verify_sha256_digest
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cghi %r2,0 /* checksum match */
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jne .disabled_wait
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/* start normal kernel */
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START_NEXT_KERNEL .base_crash
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.disabled_wait:
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lpswe disabled_wait_psw-.base_crash(%r13)
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load_psw_mask:
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.long 0x00080000,0x80000000
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.align 8
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disabled_wait_psw:
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.quad 0x0002000180000000
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.quad 0x0000000000000000 + .do_checksum_verification
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gprregs:
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.rept 10
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.quad 0
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.endr
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purgatory_sha256_digest:
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.global purgatory_sha256_digest
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.rept 32 /* SHA256_DIGEST_SIZE */
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.byte 0
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.endr
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purgatory_sha_regions:
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.global purgatory_sha_regions
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.rept 16 * __KEXEC_SHA_REGION_SIZE /* KEXEC_SEGMENTS_MAX */
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.byte 0
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.endr
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kernel_entry:
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.global kernel_entry
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.quad 0
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.align PAGE_SIZE
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stack:
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.skip PAGE_SIZE
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.align PAGE_SIZE
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purgatory_end:
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