Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/locore.S
Version:
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1 /*- 2 * Copyright (c) 2003 Peter Wemm <peter@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Copyright (c) 2020, 2021 The FreeBSD Foundation 6 * 7 * Portions of this software were developed by 8 * Konstantin Belousov <kib@FreeBSD.org> under sponsorship from 9 * the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD$ 33 */ 34 35 #include <machine/asmacros.h> 36 #include <machine/psl.h> 37 #include <machine/pmap.h> 38 #include <machine/specialreg.h> 39 40 #include "assym.inc" 41 42 /* 43 * Compiled KERNBASE location 44 */ 45 .globl kernbase, kernload, dmapbase, dmapend 46 .set kernbase,KERNBASE 47 .set kernload,KERNLOAD 48 .set dmapbase,DMAP_MIN_ADDRESS 49 .set dmapend,DMAP_MAX_ADDRESS 50 51 #define BOOTSTACK_SIZE 4096 52 53 .text 54 /********************************************************************** 55 * 56 * This is where the loader trampoline start us, set the ball rolling... 57 * 58 * We are called with the stack looking like this: 59 * 0(%rsp) = 32 bit return address (cannot be used) 60 * 4(%rsp) = 32 bit modulep 61 * 8(%rsp) = 32 bit kernend 62 * 63 * We are already in long mode, on a 64 bit %cs and running at KERNBASE. 64 */ 65 ENTRY(btext) 66 67 /* Don't trust what the loader gives for rflags. */ 68 pushq $PSL_KERNEL 69 popfq 70 71 /* Get onto a stack that we can trust - there is no going back now. */ 72 movq %rsp, %rbp 73 movq $bootstack,%rsp 74 75 #ifdef KASAN 76 /* Bootstrap a shadow map for the boot stack. */ 77 movq $bootstack, %rdi 78 subq $BOOTSTACK_SIZE, %rdi 79 movq $BOOTSTACK_SIZE, %rsi 80 call kasan_init_early 81 #endif 82 83 /* Grab metadata pointers from the loader. */ 84 movl 4(%rbp),%edi /* modulep (arg 1) */ 85 movl 8(%rbp),%esi /* kernend (arg 2) */ 86 xorq %rbp, %rbp 87 88 call hammer_time /* set up cpu for unix operation */ 89 movq %rax,%rsp /* set up kstack for mi_startup() */ 90 call mi_startup /* autoconfiguration, mountroot etc */ 91 0: hlt 92 jmp 0b 93 94 /* la57_trampoline(%rdi pml5) */ 95 ENTRY(la57_trampoline) 96 movq %rsp,%r11 97 movq %rbx,%r10 98 leaq la57_trampoline_end(%rip),%rsp 99 100 movq %cr0,%rdx 101 lgdtq la57_trampoline_gdt_desc(%rip) 102 103 pushq $(2<<3) 104 leaq l1(%rip),%rax 105 leaq l2(%rip),%rbx 106 107 pushq %rax 108 lretq 109 .code32 110 111 l1: movl $(3<<3),%eax 112 movl %eax,%ss 113 114 movl %edx,%eax 115 andl $~CR0_PG,%eax 116 movl %eax,%cr0 117 118 movl %cr4,%eax 119 orl $CR4_LA57,%eax 120 movl %eax,%cr4 121 122 movl %edi,%cr3 123 movl %edx,%cr0 124 125 pushl $(1<<3) 126 pushl %ebx 127 lretl 128 .code64 129 130 l2: movq %r11,%rsp 131 movq %r10,%rbx 132 retq 133 .p2align 4,0 134 ENTRY(la57_trampoline_gdt_desc) 135 .word la57_trampoline_end - la57_trampoline_gdt 136 .long 0 /* filled by pmap_bootstrap_la57 */ 137 .p2align 4,0 138 ENTRY(la57_trampoline_gdt) 139 .long 0x00000000 /* null desc */ 140 .long 0x00000000 141 .long 0x00000000 /* 64bit code */ 142 .long 0x00209800 143 .long 0x0000ffff /* 32bit code */ 144 .long 0x00cf9b00 145 .long 0x0000ffff /* universal data */ 146 .long 0x00cf9300 147 .dcb.l 16,0 148 ENTRY(la57_trampoline_end) 149 150 .bss 151 ALIGN_DATA /* just to be sure */ 152 .globl bootstack 153 .space BOOTSTACK_SIZE /* space for bootstack - temporary stack */ 154 bootstack:
Cache object: 3775aae68dc425371a1290fa96898f24
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