^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Purgatory setup code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2018
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Author(s): Philipp Rudo <prudo@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/linkage.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/asm-offsets.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/page.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/sigp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/ptrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) /* The purgatory is the code running between two kernels. It's main purpose
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * is to verify that the next kernel was not corrupted after load and to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * start it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * If the next kernel is a crash kernel there are some peculiarities to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * consider:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * First the purgatory is called twice. Once only to verify the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * sha digest. So if the crash kernel got corrupted the old kernel can try
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * to trigger a stand-alone dumper. And once to actually load the crash kernel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * Second the purgatory also has to swap the crash memory region with its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * destination at address 0. As the purgatory is part of crash memory this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * requires some finesse. The tactic here is that the purgatory first copies
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * itself to the end of the destination and then swaps the rest of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * memory running from there.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #define bufsz purgatory_end-stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) .macro MEMCPY dst,src,len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) lgr %r0,\dst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) lgr %r1,\len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) lgr %r2,\src
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) lgr %r3,\len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 20: mvcle %r0,%r2,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) jo 20b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) .macro MEMSWAP dst,src,buf,len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 10: cghi \len,bufsz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) jh 11f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) lgr %r4,\len
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) j 12f
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 11: lghi %r4,bufsz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 12: MEMCPY \buf,\dst,%r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) MEMCPY \dst,\src,%r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) MEMCPY \src,\buf,%r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) agr \dst,%r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) agr \src,%r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) sgr \len,%r4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) cghi \len,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) jh 10b
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) .macro START_NEXT_KERNEL base subcode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) lg %r4,kernel_entry-\base(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) lg %r5,load_psw_mask-\base(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) ogr %r4,%r5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) stg %r4,0(%r0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) xgr %r0,%r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) lghi %r1,\subcode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) diag %r0,%r1,0x308
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) .text
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) .align PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) ENTRY(purgatory_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /* The purgatory might be called after a diag308 so better set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * architecture and addressing mode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) lhi %r1,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) sigp %r1,%r0,SIGP_SET_ARCHITECTURE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) sam64
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) larl %r5,gprregs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) stmg %r6,%r15,0(%r5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) basr %r13,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) .base_crash:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) /* Setup stack */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) larl %r15,purgatory_end-STACK_FRAME_OVERHEAD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) /* If the next kernel is KEXEC_TYPE_CRASH the purgatory is called
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) * directly with a flag passed in %r2 whether the purgatory shall do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) * checksum verification only (%r2 = 0 -> verification only).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) * Check now and preserve over C function call by storing in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) * %r10 whith
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) * 1 -> checksum verification only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) * 0 -> load new kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) lghi %r10,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) lg %r11,kernel_type-.base_crash(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) cghi %r11,1 /* KEXEC_TYPE_CRASH */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) jne .do_checksum_verification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) cghi %r2,0 /* checksum verification only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) jne .do_checksum_verification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) lghi %r10,1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .do_checksum_verification:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) brasl %r14,verify_sha256_digest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) cghi %r10,1 /* checksum verification only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) je .return_old_kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) cghi %r2,0 /* checksum match */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) jne .disabled_wait
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) /* If the next kernel is a crash kernel the purgatory has to swap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * the mem regions first.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) cghi %r11,1 /* KEXEC_TYPE_CRASH */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) je .start_crash_kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) /* start normal kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) START_NEXT_KERNEL .base_crash 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) .return_old_kernel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) lmg %r6,%r15,gprregs-.base_crash(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) br %r14
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) .disabled_wait:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) lpswe disabled_wait_psw-.base_crash(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) .start_crash_kernel:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) /* Location of purgatory_start in crash memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) lgr %r8,%r13
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) aghi %r8,-(.base_crash-purgatory_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) /* Destination for this code i.e. end of memory to be swapped. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) lg %r9,crash_size-.base_crash(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) aghi %r9,-(purgatory_end-purgatory_start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) /* Destination in crash memory, i.e. same as r9 but in crash memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) lg %r10,crash_start-.base_crash(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) agr %r10,%r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /* Buffer location (in crash memory) and size. As the purgatory is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) * behind the point of no return it can re-use the stack as buffer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) lghi %r11,bufsz
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) larl %r12,stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) MEMCPY %r12,%r9,%r11 /* dst -> (crash) buf */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) MEMCPY %r9,%r8,%r11 /* self -> dst */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) /* Jump to new location. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) lgr %r7,%r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) aghi %r7,.jump_to_dst-purgatory_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) br %r7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) .jump_to_dst:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) basr %r13,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) .base_dst:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) /* clear buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) MEMCPY %r12,%r10,%r11 /* (crash) buf -> (crash) dst */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) /* Load new buffer location after jump */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) larl %r7,stack
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) aghi %r10,stack-purgatory_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) MEMCPY %r10,%r7,%r11 /* (new) buf -> (crash) buf */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Now the code is set up to run from its designated location. Start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) * swapping the rest of crash memory now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) * The registers will be used as follow:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) * %r0-%r4 reserved for macros defined above
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) * %r5-%r6 tmp registers
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) * %r7 pointer to current struct sha region
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) * %r8 index to iterate over all sha regions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) * %r9 pointer in crash memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * %r10 pointer in old kernel
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * %r11 total size (still) to be moved
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * %r12 pointer to buffer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) lgr %r12,%r7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) lgr %r11,%r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) lghi %r10,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) lg %r9,crash_start-.base_dst(%r13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) lghi %r8,16 /* KEXEC_SEGMENTS_MAX */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) larl %r7,purgatory_sha_regions
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) j .loop_first
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) /* Loop over all purgatory_sha_regions. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) .loop_next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) aghi %r8,-1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) cghi %r8,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) je .loop_out
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) aghi %r7,__KEXEC_SHA_REGION_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) .loop_first:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) lg %r5,__KEXEC_SHA_REGION_START(%r7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) cghi %r5,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) je .loop_next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) /* Copy [end last sha region, start current sha region) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) /* Note: kexec_sha_region->start points in crash memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) sgr %r5,%r9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) MEMCPY %r9,%r10,%r5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) agr %r9,%r5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) agr %r10,%r5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) sgr %r11,%r5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) /* Swap sha region */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) lg %r6,__KEXEC_SHA_REGION_LEN(%r7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) MEMSWAP %r9,%r10,%r12,%r6
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) sg %r11,__KEXEC_SHA_REGION_LEN(%r7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) j .loop_next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) .loop_out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* Copy rest of crash memory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) MEMCPY %r9,%r10,%r11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) /* start crash kernel */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) START_NEXT_KERNEL .base_dst 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) load_psw_mask:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) .long 0x00080000,0x80000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) .align 8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) disabled_wait_psw:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) .quad 0x0002000180000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) .quad 0x0000000000000000 + .do_checksum_verification
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) gprregs:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) .rept 10
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) .quad 0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) .endr
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) /* Macro to define a global variable with name and size (in bytes) to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) * shared with C code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) * Add the .size and .type attribute to satisfy checks on the Elf_Sym during
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) * purgatory load.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) .macro GLOBAL_VARIABLE name,size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) \name:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) .global \name
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) .size \name,\size
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) .type \name,object
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) .skip \size,0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) .endm
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) GLOBAL_VARIABLE purgatory_sha256_digest,32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) GLOBAL_VARIABLE purgatory_sha_regions,16*__KEXEC_SHA_REGION_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) GLOBAL_VARIABLE kernel_entry,8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) GLOBAL_VARIABLE kernel_type,8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) GLOBAL_VARIABLE crash_start,8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) GLOBAL_VARIABLE crash_size,8
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) .align PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) stack:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) /* The buffer to move this code must be as big as the code. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) .skip stack-purgatory_start
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) .align PAGE_SIZE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) purgatory_end:
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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