1/* 2 * Copyright (c) 2006 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 29#include <platforms.h> 30#include <mach_kdb.h> 31 32#include <i386/asm.h> 33#include <i386/asm64.h> 34#include <i386/proc_reg.h> 35#include <i386/postcode.h> 36#include <assym.s> 37 38 .data 39 .align 3 40 .globl EXT(gdtptr64) 41 /* align below right */ 42 .word 0 43LEXT(gdtptr64) 44 .word Times(8,GDTSZ)-1 45 /* XXX really want .quad here */ 46 .long EXT(master_gdt) 47 .long KERNEL_UBER_BASE_HI32 /* must be in uber-space */ 48 49 .align 3 50 .globl EXT(idtptr64) 51 /* align below right */ 52 .word 0 53LEXT(idtptr64) 54 .word Times(16,IDTSZ)-1 55 /* XXX really want .quad here */ 56 .long EXT(master_idt64) 57 .long KERNEL_UBER_BASE_HI32 /* must be in uber-space */ 58 59 .text 60 61Entry(ml_load_desc64) 62 63 ENTER_64BIT_MODE() 64 65 POSTCODE(ML_LOAD_DESC64_ENTRY) 66 67 lgdt EXT(gdtptr64) /* load GDT */ 68 69 POSTCODE(ML_LOAD_DESC64_GDT) 70 71 lidt EXT(idtptr64) /* load IDT */ 72 73 POSTCODE(ML_LOAD_DESC64_IDT) 74 75 movw $(KERNEL_LDT),%ax /* get LDT segment */ 76 lldt %ax /* load LDT */ 77 78 POSTCODE(ML_LOAD_DESC64_LDT) 79 80 movw $(KERNEL_TSS),%ax 81 ltr %ax /* set up KTSS */ 82 83 POSTCODE(ML_LOAD_DESC64_EXIT) 84 85 ENTER_COMPAT_MODE() 86 87 ret 88 89 90Entry(ml_64bit_wrmsr64) 91 /* (uint32_t msr, uint64_t value) */ 92 /* (uint32_t msr, uint32_t lo, uint32_t hi) */ 93 94 FRAME 95 96 ENTER_64BIT_MODE() 97 98 movl B_ARG0, %ecx 99 movl B_ARG1, %eax 100 movl B_ARG2, %edx 101 wrmsr 102 103 ENTER_COMPAT_MODE() 104 105 EMARF 106 ret 107 108 109Entry(ml_64bit_lldt) 110 /* (int32_t selector) */ 111 112 FRAME 113 114 ENTER_64BIT_MODE() 115 116 movl B_ARG0, %eax 117 lldt %ax 118 119 ENTER_COMPAT_MODE() 120 121 EMARF 122 ret 123 124Entry(set_64bit_debug_regs) 125 /* x86_debug_state64_t *ds */ 126 127 FRAME 128 129 ENTER_64BIT_MODE() 130 131 mov B_ARG0, %edx 132 mov DS64_DR0(%edx), %rax 133 mov %rax, %dr0 134 mov DS64_DR1(%edx), %rax 135 mov %rax, %dr1 136 mov DS64_DR2(%edx), %rax 137 mov %rax, %dr2 138 mov DS64_DR3(%edx), %rax 139 mov %rax, %dr3 140 141 ENTER_COMPAT_MODE() 142 143 EMARF 144 ret 145 146Entry(flush_tlb64) 147 148 FRAME 149 150 ENTER_64BIT_MODE() 151 152 mov %cr3, %rax 153 mov %rax, %cr3 154 155 ENTER_COMPAT_MODE() 156 157 EMARF 158 ret 159 160Entry(set64_cr3) 161 162 FRAME 163 164 movl B_ARG0, %eax 165 movl B_ARG1, %edx 166 167 ENTER_64BIT_MODE() 168 169 /* %rax = %edx:%eax */ 170 shl $32, %rax 171 shrd $32, %rdx, %rax 172 173 mov %rax, %cr3 174 175 ENTER_COMPAT_MODE() 176 177 EMARF 178 ret 179 180Entry(get64_cr3) 181 182 FRAME 183 184 ENTER_64BIT_MODE() 185 186 mov %cr3, %rax 187 mov %rax, %rdx 188 shr $32, %rdx // %edx:%eax = %cr3 189 190 ENTER_COMPAT_MODE() 191 192 EMARF 193 ret 194 195/* FXSAVE and FXRSTOR operate in a mode dependent fashion, hence these variants. 196 * Must be called with interrupts disabled. 197 * We clear pending x87 exceptions here; this is technically incorrect, since we 198 * should propagate those to the user, but the compatibility mode kernel is 199 * currently not prepared to handle exceptions originating in 64-bit kernel mode. 200 * However, it may be possible to work around this should it prove necessary. 201 */ 202 203Entry(fxsave64) 204 movl S_ARG0,%eax 205 ENTER_64BIT_MODE() 206 fnclex 207 fxsave 0(%eax) 208 ENTER_COMPAT_MODE() 209 ret 210 211Entry(fxrstor64) 212 movl S_ARG0,%eax 213 ENTER_64BIT_MODE() 214 fnclex 215 fxrstor 0(%rax) 216 ENTER_COMPAT_MODE() 217 ret 218