1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * S390 kdump lowlevel functions (new kernel) 4 * 5 * Copyright IBM Corp. 2011 6 * Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com> 7 */ 8 9#include <asm/sigp.h> 10 11#define DATAMOVER_ADDR 0x4000 12#define COPY_PAGE_ADDR 0x6000 13 14#ifdef CONFIG_CRASH_DUMP 15 16# 17# kdump entry (new kernel - not yet relocated) 18# 19# Note: This code has to be position independent 20# 21 22SYM_CODE_START_LOCAL(startup_kdump) 23 lhi %r1,2 # mode 2 = esame (dump) 24 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # Switch to esame mode 25 sam64 # Switch to 64 bit addressing 26 basr %r13,0 27.Lbase: 28 larl %r2,.Lbase_addr # Check, if we have been 29 lg %r2,0(%r2) # already relocated: 30 clgr %r2,%r13 # 31 jne .Lrelocate # No : Start data mover 32 lghi %r2,0 # Yes: Start kdump kernel 33 brasl %r14,startup_kdump_relocated 34 35.Lrelocate: 36 larl %r4,startup 37 lg %r2,0x418(%r4) # Get kdump base 38 lg %r3,0x420(%r4) # Get kdump size 39 40 larl %r10,.Lcopy_start # Source of data mover 41 lghi %r8,DATAMOVER_ADDR # Target of data mover 42 mvc 0(256,%r8),0(%r10) # Copy data mover code 43 44 agr %r8,%r2 # Copy data mover to 45 mvc 0(256,%r8),0(%r10) # reserved mem 46 47 lghi %r14,DATAMOVER_ADDR # Jump to copied data mover 48 basr %r14,%r14 49.Lbase_addr: 50 .quad .Lbase 51 52# 53# kdump data mover code (runs at address DATAMOVER_ADDR) 54# 55# r2: kdump base address 56# r3: kdump size 57# 58.Lcopy_start: 59 basr %r13,0 # Base 600: 61 lgr %r11,%r2 # Save kdump base address 62 lgr %r12,%r2 63 agr %r12,%r3 # Compute kdump end address 64 65 lghi %r5,0 66 lghi %r10,COPY_PAGE_ADDR # Load copy page address 671: 68 mvc 0(256,%r10),0(%r5) # Copy old kernel to tmp 69 mvc 0(256,%r5),0(%r11) # Copy new kernel to old 70 mvc 0(256,%r11),0(%r10) # Copy tmp to new 71 aghi %r11,256 72 aghi %r5,256 73 clgr %r11,%r12 74 jl 1b 75 76 lg %r14,.Lstartup_kdump-0b(%r13) 77 basr %r14,%r14 # Start relocated kernel 78.Lstartup_kdump: 79 .long 0x00000000,0x00000000 + startup_kdump_relocated 80.Lcopy_end: 81 82# 83# Startup of kdump (relocated new kernel) 84# 85.align 2 86startup_kdump_relocated: 87 basr %r13,0 880: lpswe .Lrestart_psw-0b(%r13) # Start new kernel... 89SYM_CODE_END(startup_kdump) 90.align 8 91.Lrestart_psw: 92 .quad 0x0000000080000000,0x0000000000000000 + startup 93#else 94SYM_CODE_START_LOCAL(startup_kdump) 95 larl %r13,startup_kdump_crash 96 lpswe 0(%r13) 97SYM_CODE_END(startup_kdump) 98.align 8 99startup_kdump_crash: 100 .quad 0x0002000080000000,0x0000000000000000 + startup_kdump_crash 101#endif /* CONFIG_CRASH_DUMP */ 102