1/* $FreeBSD$ */ 2 3/*- 4 * Copyright (C) 2010-2016 Nathan Whitehorn 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30#include "assym.inc" 31 32#include <sys/syscall.h> 33 34#include <machine/trap.h> 35#include <machine/param.h> 36#include <machine/spr.h> 37#include <machine/asm.h> 38#include <machine/vmparam.h> 39 40#ifdef _CALL_ELF 41.abiversion _CALL_ELF 42#endif 43 44/* Glue for linker script */ 45.globl kernbase 46.set kernbase, KERNBASE 47 48/* 49 * Globals 50 */ 51 .data 52 .align 3 53GLOBAL(__startkernel) 54 .llong begin 55GLOBAL(__endkernel) 56 .llong end 57GLOBAL(can_wakeup) 58 .llong 0x0 59 60 .align 4 61#define TMPSTKSZ 16384 /* 16K temporary stack */ 62GLOBAL(tmpstk) 63 .space TMPSTKSZ 64 65TOC_ENTRY(tmpstk) 66TOC_ENTRY(can_wakeup) 67 68/* 69 * Entry point for bootloaders that do not fully implement ELF and start 70 * at the beginning of the image (kexec, notably). In its own section so 71 * that it ends up before any linker-generated call stubs and actually at 72 * the beginning of the image. kexec on some systems also enters at 73 * (start of image) + 0x60, so put a spin loop there. 74 */ 75 .section ".text.kboot", "x", @progbits 76kbootentry: 77 b __start 78. = kbootentry + 0x40 /* Magic address used in platform layer */ 79 .global smp_spin_sem 80ap_kexec_spin_sem: 81 .long -1 82. = kbootentry + 0x60 /* Entry point for kexec APs */ 83ap_kexec_start: /* At 0x60 past start, copied to 0x60 by kexec */ 84 /* r3 set to CPU ID by kexec */ 85 86 /* Invalidate icache for low-memory copy and jump there */ 87 li %r0,0x80 88 dcbst 0,%r0 89 sync 90 icbi 0,%r0 91 isync 92 ba 0x80 /* Absolute branch to next inst */ 93 94. = kbootentry + 0x80 /* Aligned to cache line */ 951: or 31,31,31 /* yield */ 96 sync 97 lwz %r1,0x40(0) /* Spin on ap_kexec_spin_sem */ 98 cmpw %r1,%r3 /* Until it equals our CPU ID */ 99 bne 1b 100 101 /* Released */ 102 or 2,2,2 /* unyield */ 103 104 /* Make sure that it will be software reset. Clear SRR1 */ 105 li %r1,0 106 mtsrr1 %r1 107 ba EXC_RST 108 109/* 110 * Now start the real text section 111 */ 112 113 .text 114 .globl btext 115btext: 116 117/* 118 * Main kernel entry point. 119 * 120 * Calling convention: 121 * r3: Flattened Device Tree pointer (or zero) 122 * r4: ignored 123 * r5: OF client interface pointer (or zero) 124 * r6: Loader metadata pointer (or zero) 125 * r7: Magic cookie (0xfb5d104d) to indicate that r6 has loader metadata 126 */ 127 .text 128ASENTRY_NOPROF(__start) 129 /* Set 64-bit mode if not yet set before branching to C */ 130 mfmsr %r20 131 li %r21,1 132 insrdi %r20,%r21,1,0 133 mtmsrd %r20 134 isync 135 nop /* Make this block a multiple of 8 bytes */ 136 137 /* Set up the TOC pointer */ 138 b 0f 139 .align 3 1400: nop 141 bl 1f 142 .llong __tocbase + 0x8000 - . 1431: mflr %r2 144 ld %r1,0(%r2) 145 add %r2,%r1,%r2 146 147 /* Get load offset */ 148 ld %r31,-0x8000(%r2) /* First TOC entry is TOC base */ 149 subf %r31,%r31,%r2 /* Subtract from real TOC base to get base */ 150 151 /* Set up the stack pointer */ 152 bl 1f 153 .llong tmpstk + TMPSTKSZ - 96 - . 1541: mflr %r30 155 ld %r1,0(%r30) 156 add %r1,%r1,%r30 157 nop 158 159 /* Relocate kernel */ 160 std %r3,48(%r1) 161 std %r4,56(%r1) 162 std %r5,64(%r1) 163 std %r6,72(%r1) 164 std %r7,80(%r1) 165 166 bl 1f 167 .llong _DYNAMIC-. 1681: mflr %r3 169 ld %r4,0(%r3) 170 add %r3,%r4,%r3 171 mr %r4,%r31 172 bl elf_reloc_self 173 nop 174 ld %r3,48(%r1) 175 ld %r4,56(%r1) 176 ld %r5,64(%r1) 177 ld %r6,72(%r1) 178 ld %r7,80(%r1) 179 180 /* Begin CPU init */ 181 mr %r4,%r2 /* Replace ignored r4 with tocbase for trap handlers */ 182 bl powerpc_init 183 nop 184 185 /* Set stack pointer to new value and branch to mi_startup */ 186 mr %r1, %r3 187 li %r3, 0 188 std %r3, 0(%r1) 189 bl mi_startup 190 nop 191 192 /* Unreachable */ 193 b . 194 195ASENTRY_NOPROF(__restartkernel) 196 /* 197 * r3-r7: arguments to go to __start 198 * r8: offset from current kernel address to apply 199 * r9: MSR to set when (atomically) jumping to __start + r8 200 */ 201 mtsrr1 %r9 202 bl 1f 2031: mflr %r25 204 add %r25,%r8,%r25 205 addi %r25,%r25,2f-1b 206 mtsrr0 %r25 207 rfid 2082: bl __start 209 nop 210 211#include <powerpc/aim/trap_subr64.S> 212