1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright IBM Corp. 2005 4 * 5 * Author(s): Rolf Adelsberger, 6 * Heiko Carstens <heiko.carstens@de.ibm.com> 7 * 8 */ 9 10#include <linux/linkage.h> 11#include <asm/page.h> 12#include <asm/sigp.h> 13 14/* 15 * moves the new kernel to its destination... 16 * %r2 = pointer to first kimage_entry_t 17 * %r3 = start address - where to jump to after the job is done... 18 * 19 * %r5 will be used as temp. storage 20 * %r6 holds the destination address 21 * %r7 = PAGE_SIZE 22 * %r8 holds the source address 23 * %r9 = PAGE_SIZE 24 * 25 * 0xf000 is a page_mask 26 */ 27 28 .text 29ENTRY(relocate_kernel) 30 basr %r13,0 # base address 31 .base: 32 stctg %c0,%c15,ctlregs-.base(%r13) 33 stmg %r0,%r15,gprregs-.base(%r13) 34 lghi %r0,3 35 sllg %r0,%r0,31 36 stg %r0,0x1d0(%r0) 37 la %r0,.back_pgm-.base(%r13) 38 stg %r0,0x1d8(%r0) 39 la %r1,load_psw-.base(%r13) 40 mvc 0(8,%r0),0(%r1) 41 la %r0,.back-.base(%r13) 42 st %r0,4(%r0) 43 oi 4(%r0),0x80 44 lghi %r0,0 45 diag %r0,%r0,0x308 46 .back: 47 lhi %r1,1 # mode 1 = esame 48 sigp %r1,%r0,SIGP_SET_ARCHITECTURE # switch to esame mode 49 sam64 # switch to 64 bit addressing mode 50 basr %r13,0 51 .back_base: 52 oi have_diag308-.back_base(%r13),0x01 53 lctlg %c0,%c15,ctlregs-.back_base(%r13) 54 lmg %r0,%r15,gprregs-.back_base(%r13) 55 j .top 56 .back_pgm: 57 lmg %r0,%r15,gprregs-.base(%r13) 58 .top: 59 lghi %r7,PAGE_SIZE # load PAGE_SIZE in r7 60 lghi %r9,PAGE_SIZE # load PAGE_SIZE in r9 61 lg %r5,0(%r2) # read another word for indirection page 62 aghi %r2,8 # increment pointer 63 tml %r5,0x1 # is it a destination page? 64 je .indir_check # NO, goto "indir_check" 65 lgr %r6,%r5 # r6 = r5 66 nill %r6,0xf000 # mask it out and... 67 j .top # ...next iteration 68 .indir_check: 69 tml %r5,0x2 # is it a indirection page? 70 je .done_test # NO, goto "done_test" 71 nill %r5,0xf000 # YES, mask out, 72 lgr %r2,%r5 # move it into the right register, 73 j .top # and read next... 74 .done_test: 75 tml %r5,0x4 # is it the done indicator? 76 je .source_test # NO! Well, then it should be the source indicator... 77 j .done # ok, lets finish it here... 78 .source_test: 79 tml %r5,0x8 # it should be a source indicator... 80 je .top # NO, ignore it... 81 lgr %r8,%r5 # r8 = r5 82 nill %r8,0xf000 # masking 83 0: mvcle %r6,%r8,0x0 # copy PAGE_SIZE bytes from r8 to r6 - pad with 0 84 jo 0b 85 j .top 86 .done: 87 sgr %r0,%r0 # clear register r0 88 la %r4,load_psw-.base(%r13) # load psw-address into the register 89 o %r3,4(%r4) # or load address into psw 90 st %r3,4(%r4) 91 mvc 0(8,%r0),0(%r4) # copy psw to absolute address 0 92 tm have_diag308-.base(%r13),0x01 93 jno .no_diag308 94 diag %r0,%r0,0x308 95 .no_diag308: 96 sam31 # 31 bit mode 97 sr %r1,%r1 # erase register r1 98 sr %r2,%r2 # erase register r2 99 sigp %r1,%r2,SIGP_SET_ARCHITECTURE # set cpuid to zero 100 lpsw 0 # hopefully start new kernel... 101 102 .align 8 103 load_psw: 104 .long 0x00080000,0x80000000 105 ctlregs: 106 .rept 16 107 .quad 0 108 .endr 109 gprregs: 110 .rept 16 111 .quad 0 112 .endr 113 have_diag308: 114 .byte 0 115 .align 8 116 relocate_kernel_end: 117 .align 8 118 .globl relocate_kernel_len 119 relocate_kernel_len: 120 .quad relocate_kernel_end - relocate_kernel 121