1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2013 (c) Joyent, Inc. All rights reserved. 14 * Copyright (c) 2015 Josef 'Jeff' Sipek <jeffpc@josefsipek.net> 15 */ 16 17 #include <sys/asm_linkage.h> 18 #include <sys/machparam.h> 19 #include <sys/cpu_asm.h> 20 21 #include "assym.h" 22 23 #if defined(__lint) 24 25 #endif 26 27 /* 28 * Each of the different machines has its own locore.s to take care of getting 29 * us into fakebop for the first time. After that, they all return here to a 30 * generic locore to take us into mlsetup and then to main forever more. 31 */ 32 33 /* 34 * External globals 35 */ 36 .globl _locore_start 37 .globl mlsetup 38 .globl sysp 39 .globl bootops 40 .globl bootopsp 41 .globl t0 42 43 .data 44 .comm t0stack, DEFAULTSTKSZ, 32 45 .comm t0, 4094, 32 46 47 #if defined(__lint) 48 49 /* ARGSUSED */ 50 void 51 _locore_start(struct boot_syscalls *sysp, struct bootops *bop) 52 {} 53 54 #else /* __lint */ 55 56 /* 57 * We got here from _kobj_init() via exitto(). We have a few different 58 * tasks that we need to take care of before we hop into mlsetup and 59 * then main. We're never going back so we shouldn't feel compelled to 60 * preserve any registers. 61 * 62 * o Enable our I/D-caches 63 * o Save the boot syscalls and bootops for later 64 * o Set up our stack to be the real stack of t0stack. 65 * o Save t0 as curthread 66 * o Set up a struct REGS for mlsetup 67 * o Make sure that we're 8 byte aligned for the call 68 */ 69 70 ENTRY(_locore_start) 71 72 73 /* 74 * We've been running in t0stack anyway, up to this point, but 75 * _locore_start represents what is in effect a fresh start in the 76 * real kernel -- We'll never return back through here. 77 * 78 * So reclaim those few bytes 79 */ 80 ldr sp, =t0stack 81 ldr r4, =(DEFAULTSTKSZ - REGSIZE) 82 add sp, r4 83 bic sp, sp, #0xff 84 85 /* 86 * Save flags and arguments for potential debugging 87 */ 88 str r0, [sp, #REGOFF_R0] 89 str r1, [sp, #REGOFF_R1] 90 str r2, [sp, #REGOFF_R2] 91 str r3, [sp, #REGOFF_R3] 92 mrs r4, CPSR 93 str r4, [sp, #REGOFF_CPSR] 94 95 /* 96 * Save back the bootops and boot_syscalls. 97 */ 98 ldr r2, =sysp 99 str r0, [r2] 100 ldr r2, =bootops 101 str r1, [r2] 102 ldr r2, =bootopsp 103 ldr r2, [r2] 104 str r1, [r2] 105 106 /* 107 * Set up our curthread pointer 108 */ 109 ldr r0, =t0 110 mcr p15, 0, r0, c13, c0, 4 111 112 /* 113 * Go ahead now and enable the L1 I/D caches. 114 */ 115 mrc p15, 0, r0, c1, c0, 0 116 orr r0, #0x04 /* D-cache */ 117 orr r0, #0x1000 /* I-cache */ 118 mcr p15, 0, r0, c1, c0, 0 119 120 /* 121 * mlsetup() takes the struct regs as an argument. main doesn't take 122 * any and should never return. Currently, we have an 8-byte aligned 123 * stack. We want to push a zero frame pointer to terminate any 124 * stack walking, but that would cause us to end up with only a 125 * 4-byte aligned stack. So, to keep things nice and correct, we 126 * push a zero value twice - it's similar to a typical function 127 * entry: 128 * push { r9, lr } 129 */ 130 mov r9,#0 131 push { r9 } /* link register */ 132 push { r9 } /* frame pointer */ 133 mov r0, sp 134 bl mlsetup 135 bl main 136 /* NOTREACHED */ 137 ldr r0,=__return_from_main 138 ldr r0,[r0] 139 bl panic 140 SET_SIZE(_locore_start) 141 142 __return_from_main: 143 .string "main() returned" 144 #endif /* __lint */