15933f6d2SKuninori Morimoto/* SPDX-License-Identifier: GPL-2.0 25933f6d2SKuninori Morimoto * 39d44190eSkogiidena * relocate_kernel.S - put the kernel image in place to boot 49d44190eSkogiidena * 2005.9.17 kogiidena@eggplant.ddo.jp 59d44190eSkogiidena * 69d44190eSkogiidena * LANDISK/sh4 is supported. Maybe, SH archtecture works well. 79d44190eSkogiidena * 8b7cf6ddcSMagnus Damm * 2009-03-18 Magnus Damm - Added Kexec Jump support 99d44190eSkogiidena */ 109d44190eSkogiidena#include <linux/linkage.h> 11510c72adSPaul Mundt#include <asm/addrspace.h> 12510c72adSPaul Mundt#include <asm/page.h> 139d44190eSkogiidena 149d44190eSkogiidena .globl relocate_new_kernel 159d44190eSkogiidenarelocate_new_kernel: 169d44190eSkogiidena /* r4 = indirection_page */ 179d44190eSkogiidena /* r5 = reboot_code_buffer */ 189d44190eSkogiidena /* r6 = start_address */ 199d44190eSkogiidena 20b7cf6ddcSMagnus Damm mov.l 10f, r0 /* PAGE_SIZE */ 21b7cf6ddcSMagnus Damm add r5, r0 /* setup new stack at end of control page */ 229d44190eSkogiidena 23b7cf6ddcSMagnus Damm /* save r15->r8 to new stack */ 24b7cf6ddcSMagnus Damm mov.l r15, @-r0 25b7cf6ddcSMagnus Damm mov r0, r15 26b7cf6ddcSMagnus Damm mov.l r14, @-r15 27b7cf6ddcSMagnus Damm mov.l r13, @-r15 28b7cf6ddcSMagnus Damm mov.l r12, @-r15 29b7cf6ddcSMagnus Damm mov.l r11, @-r15 30b7cf6ddcSMagnus Damm mov.l r10, @-r15 31b7cf6ddcSMagnus Damm mov.l r9, @-r15 32b7cf6ddcSMagnus Damm mov.l r8, @-r15 339d44190eSkogiidena 34b7cf6ddcSMagnus Damm /* save other random registers */ 35b7cf6ddcSMagnus Damm sts.l macl, @-r15 36b7cf6ddcSMagnus Damm sts.l mach, @-r15 37b7cf6ddcSMagnus Damm stc.l gbr, @-r15 38b7cf6ddcSMagnus Damm stc.l ssr, @-r15 39b7cf6ddcSMagnus Damm stc.l sr, @-r15 40b7cf6ddcSMagnus Damm sts.l pr, @-r15 41b7cf6ddcSMagnus Damm stc.l spc, @-r15 42b7cf6ddcSMagnus Damm 43b7cf6ddcSMagnus Damm /* switch to bank1 and save r7->r0 */ 44b7cf6ddcSMagnus Damm mov.l 12f, r9 45b7cf6ddcSMagnus Damm stc sr, r8 46b7cf6ddcSMagnus Damm or r9, r8 47b7cf6ddcSMagnus Damm ldc r8, sr 48b7cf6ddcSMagnus Damm mov.l r7, @-r15 49b7cf6ddcSMagnus Damm mov.l r6, @-r15 50b7cf6ddcSMagnus Damm mov.l r5, @-r15 51b7cf6ddcSMagnus Damm mov.l r4, @-r15 52b7cf6ddcSMagnus Damm mov.l r3, @-r15 53b7cf6ddcSMagnus Damm mov.l r2, @-r15 54b7cf6ddcSMagnus Damm mov.l r1, @-r15 55b7cf6ddcSMagnus Damm mov.l r0, @-r15 56b7cf6ddcSMagnus Damm 57b7cf6ddcSMagnus Damm /* switch to bank0 and save r7->r0 */ 58b7cf6ddcSMagnus Damm mov.l 12f, r9 59b7cf6ddcSMagnus Damm not r9, r9 60b7cf6ddcSMagnus Damm stc sr, r8 61b7cf6ddcSMagnus Damm and r9, r8 62b7cf6ddcSMagnus Damm ldc r8, sr 63b7cf6ddcSMagnus Damm mov.l r7, @-r15 64b7cf6ddcSMagnus Damm mov.l r6, @-r15 65b7cf6ddcSMagnus Damm mov.l r5, @-r15 66b7cf6ddcSMagnus Damm mov.l r4, @-r15 67b7cf6ddcSMagnus Damm mov.l r3, @-r15 68b7cf6ddcSMagnus Damm mov.l r2, @-r15 69b7cf6ddcSMagnus Damm mov.l r1, @-r15 70b7cf6ddcSMagnus Damm mov.l r0, @-r15 71b7cf6ddcSMagnus Damm 72b7cf6ddcSMagnus Damm mov.l r4, @-r15 /* save indirection page again */ 73b7cf6ddcSMagnus Damm 74b7cf6ddcSMagnus Damm bsr swap_pages /* swap pages before jumping to new kernel */ 75b7cf6ddcSMagnus Damm nop 76b7cf6ddcSMagnus Damm 77b7cf6ddcSMagnus Damm mova 11f, r0 78b7cf6ddcSMagnus Damm mov.l r15, @r0 /* save pointer to stack */ 79b7cf6ddcSMagnus Damm 80b7cf6ddcSMagnus Damm jsr @r6 /* hand over control to new kernel */ 81b7cf6ddcSMagnus Damm nop 82b7cf6ddcSMagnus Damm 83b7cf6ddcSMagnus Damm mov.l 11f, r15 /* get pointer to stack */ 84b7cf6ddcSMagnus Damm mov.l @r15+, r4 /* restore r4 to get indirection page */ 85b7cf6ddcSMagnus Damm 86b7cf6ddcSMagnus Damm bsr swap_pages /* swap pages back to previous state */ 87b7cf6ddcSMagnus Damm nop 88b7cf6ddcSMagnus Damm 89b7cf6ddcSMagnus Damm /* make sure bank0 is active and restore r0->r7 */ 90b7cf6ddcSMagnus Damm mov.l 12f, r9 91b7cf6ddcSMagnus Damm not r9, r9 92b7cf6ddcSMagnus Damm stc sr, r8 93b7cf6ddcSMagnus Damm and r9, r8 94b7cf6ddcSMagnus Damm ldc r8, sr 95b7cf6ddcSMagnus Damm mov.l @r15+, r0 96b7cf6ddcSMagnus Damm mov.l @r15+, r1 97b7cf6ddcSMagnus Damm mov.l @r15+, r2 98b7cf6ddcSMagnus Damm mov.l @r15+, r3 99b7cf6ddcSMagnus Damm mov.l @r15+, r4 100b7cf6ddcSMagnus Damm mov.l @r15+, r5 101b7cf6ddcSMagnus Damm mov.l @r15+, r6 102b7cf6ddcSMagnus Damm mov.l @r15+, r7 103b7cf6ddcSMagnus Damm 104b7cf6ddcSMagnus Damm /* switch to bank1 and restore r0->r7 */ 105b7cf6ddcSMagnus Damm mov.l 12f, r9 106b7cf6ddcSMagnus Damm stc sr, r8 107b7cf6ddcSMagnus Damm or r9, r8 108b7cf6ddcSMagnus Damm ldc r8, sr 109b7cf6ddcSMagnus Damm mov.l @r15+, r0 110b7cf6ddcSMagnus Damm mov.l @r15+, r1 111b7cf6ddcSMagnus Damm mov.l @r15+, r2 112b7cf6ddcSMagnus Damm mov.l @r15+, r3 113b7cf6ddcSMagnus Damm mov.l @r15+, r4 114b7cf6ddcSMagnus Damm mov.l @r15+, r5 115b7cf6ddcSMagnus Damm mov.l @r15+, r6 116b7cf6ddcSMagnus Damm mov.l @r15+, r7 117b7cf6ddcSMagnus Damm 118b7cf6ddcSMagnus Damm /* switch back to bank0 */ 119b7cf6ddcSMagnus Damm mov.l 12f, r9 120b7cf6ddcSMagnus Damm not r9, r9 121b7cf6ddcSMagnus Damm stc sr, r8 122b7cf6ddcSMagnus Damm and r9, r8 123b7cf6ddcSMagnus Damm ldc r8, sr 124b7cf6ddcSMagnus Damm 125b7cf6ddcSMagnus Damm /* restore other random registers */ 126b7cf6ddcSMagnus Damm ldc.l @r15+, spc 127b7cf6ddcSMagnus Damm lds.l @r15+, pr 128b7cf6ddcSMagnus Damm ldc.l @r15+, sr 129b7cf6ddcSMagnus Damm ldc.l @r15+, ssr 130b7cf6ddcSMagnus Damm ldc.l @r15+, gbr 131b7cf6ddcSMagnus Damm lds.l @r15+, mach 132b7cf6ddcSMagnus Damm lds.l @r15+, macl 133b7cf6ddcSMagnus Damm 134b7cf6ddcSMagnus Damm /* restore r8->r15 */ 135b7cf6ddcSMagnus Damm mov.l @r15+, r8 136b7cf6ddcSMagnus Damm mov.l @r15+, r9 137b7cf6ddcSMagnus Damm mov.l @r15+, r10 138b7cf6ddcSMagnus Damm mov.l @r15+, r11 139b7cf6ddcSMagnus Damm mov.l @r15+, r12 140b7cf6ddcSMagnus Damm mov.l @r15+, r13 141b7cf6ddcSMagnus Damm mov.l @r15+, r14 142b7cf6ddcSMagnus Damm mov.l @r15+, r15 143b7cf6ddcSMagnus Damm rts 144b7cf6ddcSMagnus Damm nop 145b7cf6ddcSMagnus Damm 146b7cf6ddcSMagnus Dammswap_pages: 1479d44190eSkogiidena bra 1f 1489d44190eSkogiidena mov r4,r0 /* cmd = indirection_page */ 1499d44190eSkogiidena0: 1509d44190eSkogiidena mov.l @r4+,r0 /* cmd = *ind++ */ 1519d44190eSkogiidena 152e4e063d0SMagnus Damm1: /* addr = cmd & 0xfffffff0 */ 1539d44190eSkogiidena mov r0,r2 1549d44190eSkogiidena mov #-16,r1 1559d44190eSkogiidena and r1,r2 1569d44190eSkogiidena 1579d44190eSkogiidena /* if(cmd & IND_DESTINATION) dst = addr */ 1589d44190eSkogiidena tst #1,r0 1599d44190eSkogiidena bt 2f 1609d44190eSkogiidena bra 0b 1619d44190eSkogiidena mov r2,r5 1629d44190eSkogiidena 1639d44190eSkogiidena2: /* else if(cmd & IND_INDIRECTION) ind = addr */ 1649d44190eSkogiidena tst #2,r0 1659d44190eSkogiidena bt 3f 1669d44190eSkogiidena bra 0b 1679d44190eSkogiidena mov r2,r4 1689d44190eSkogiidena 169b7cf6ddcSMagnus Damm3: /* else if(cmd & IND_DONE) return */ 1709d44190eSkogiidena tst #4,r0 1719d44190eSkogiidena bt 4f 172b7cf6ddcSMagnus Damm rts 1739d44190eSkogiidena nop 1749d44190eSkogiidena 1759d44190eSkogiidena4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */ 1769d44190eSkogiidena tst #8,r0 1779d44190eSkogiidena bt 0b 1789d44190eSkogiidena 179b7cf6ddcSMagnus Damm mov.l 10f,r3 /* PAGE_SIZE */ 1809d44190eSkogiidena shlr2 r3 1819d44190eSkogiidena shlr2 r3 1829d44190eSkogiidena5: 1839d44190eSkogiidena dt r3 184b7cf6ddcSMagnus Damm 185b7cf6ddcSMagnus Damm /* regular kexec just overwrites the destination page 186b7cf6ddcSMagnus Damm * with the contents of the source page. 187b7cf6ddcSMagnus Damm * for the kexec jump case we need to swap the contents 188b7cf6ddcSMagnus Damm * of the pages. 189b7cf6ddcSMagnus Damm * to keep it simple swap the contents for both cases. 190b7cf6ddcSMagnus Damm */ 191b7cf6ddcSMagnus Damm mov.l @(0, r2), r8 192b7cf6ddcSMagnus Damm mov.l @(0, r5), r1 193b7cf6ddcSMagnus Damm mov.l r8, @(0, r5) 194b7cf6ddcSMagnus Damm mov.l r1, @(0, r2) 195b7cf6ddcSMagnus Damm 196b7cf6ddcSMagnus Damm mov.l @(4, r2), r8 197b7cf6ddcSMagnus Damm mov.l @(4, r5), r1 198b7cf6ddcSMagnus Damm mov.l r8, @(4, r5) 199b7cf6ddcSMagnus Damm mov.l r1, @(4, r2) 200b7cf6ddcSMagnus Damm 201b7cf6ddcSMagnus Damm mov.l @(8, r2), r8 202b7cf6ddcSMagnus Damm mov.l @(8, r5), r1 203b7cf6ddcSMagnus Damm mov.l r8, @(8, r5) 204b7cf6ddcSMagnus Damm mov.l r1, @(8, r2) 205b7cf6ddcSMagnus Damm 206b7cf6ddcSMagnus Damm mov.l @(12, r2), r8 207b7cf6ddcSMagnus Damm mov.l @(12, r5), r1 208b7cf6ddcSMagnus Damm mov.l r8, @(12, r5) 209b7cf6ddcSMagnus Damm mov.l r1, @(12, r2) 210b7cf6ddcSMagnus Damm 211b7cf6ddcSMagnus Damm add #16,r5 212b7cf6ddcSMagnus Damm add #16,r2 2139d44190eSkogiidena bf 5b 2149d44190eSkogiidena 2159d44190eSkogiidena bra 0b 2169d44190eSkogiidena nop 2179d44190eSkogiidena 2189d44190eSkogiidena .align 2 2199d44190eSkogiidena10: 2209d44190eSkogiidena .long PAGE_SIZE 221b7cf6ddcSMagnus Damm11: 222b7cf6ddcSMagnus Damm .long 0 223b7cf6ddcSMagnus Damm12: 224b7cf6ddcSMagnus Damm .long 0x20000000 ! RB=1 2259d44190eSkogiidena 2269d44190eSkogiidenarelocate_new_kernel_end: 2279d44190eSkogiidena 2289d44190eSkogiidena .globl relocate_new_kernel_size 2299d44190eSkogiidenarelocate_new_kernel_size: 2309d44190eSkogiidena .long relocate_new_kernel_end - relocate_new_kernel 231