1/* 2 * Copyright (c) 2000 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 * @OSF_COPYRIGHT@ 30 */ 31 32/* 33 * Mach Operating System 34 * Copyright (c) 1991,1990 Carnegie Mellon University 35 * All Rights Reserved. 36 * 37 * Permission to use, copy, modify and distribute this software and its 38 * documentation is hereby granted, provided that both the copyright 39 * notice and this permission notice appear in all copies of the 40 * software, derivative works or modified versions, and any portions 41 * thereof, and that both notices appear in supporting documentation. 42 * 43 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 44 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR 45 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 46 * 47 * Carnegie Mellon requests users of this software to return to 48 * 49 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 50 * School of Computer Science 51 * Carnegie Mellon University 52 * Pittsburgh PA 15213-3890 53 * 54 * any improvements or extensions that they make and grant Carnegie Mellon 55 * the rights to redistribute these changes. 56 */ 57 58#include <i386/asm.h> 59#include <i386/mp_slave_boot.h> 60#include <i386/postcode.h> 61 62#define CR0_PE_ON 0x1 63#define CR0_PE_OFF 0xfffffffe 64 65 .file "slave_boot.s" 66 67 .text 68 .align 12 // Page align for single bcopy_phys() 69 70#define operand_size_prefix .byte 0x66 71#define address_size_prefix .byte 0x67 72 73#define LJMP(segment,address) \ 74 operand_size_prefix ;\ 75 .byte 0xea ;\ 76 .long address-EXT(slave_boot_base) ;\ 77 .word segment 78 79#define LGDT(address) \ 80 address_size_prefix ;\ 81 operand_size_prefix ;\ 82 .word 0x010f ;\ 83 .byte 0x15 ;\ 84 .long address-EXT(slave_boot_base) 85 86Entry(slave_boot_base) 87 /* code is loaded at 0x0:0x1000 */ 88 /* ljmp to the next instruction to set up %cs */ 89 LJMP(MP_BOOTSEG, EXT(slave_rstart)) 90 91Entry(slave_rstart) 92 /* set up %ds */ 93 mov %cs, %ax 94 mov %ax, %ds 95 96 POSTCODE(SLAVE_RSTART_ENTRY); 97 98 /* set up %ss and %esp */ 99 mov %cs, %ax 100 mov %ax, %ss 101 mov $(MP_BOOTSTACK), %esp 102 103 /*set up %es */ 104 mov %ax, %es 105 106 /* change to protected mode */ 107 operand_size_prefix 108 call EXT(slave_real_to_prot) 109 110 push MP_MACH_START 111 call EXT(slave_startprog) 112 113/* 114 slave_real_to_prot() 115 transfer from real mode to protected mode. 116*/ 117 118Entry(slave_real_to_prot) 119 /* guarantee that interrupt is disabled when in prot mode */ 120 cli 121 122 POSTCODE(SLAVE_REAL_TO_PROT_ENTRY); 123 124 /* load the gdtr */ 125 LGDT(EXT(gdtr)) 126 127 /* load the gdtr */ 128 /* set the PE bit of CR0 */ 129 mov %cr0, %eax 130 or $(CR0_PE_ON), %eax 131 mov %eax, %cr0 132 133 /* make intrasegment jump to flush the processor pipeline and */ 134 /* reload CS register */ 135 LJMP(0x08, xprot) 136xprot: 137 138 /* we are in USE32 mode now */ 139 /* set up the protective mode segment registers : DS, SS, ES */ 140 mov $0x10, %eax 141 movw %ax, %ds 142 movw %ax, %ss 143 movw %ax, %es 144 145 POSTCODE(SLAVE_REAL_TO_PROT_EXIT); 146 147 ret 148 149/* 150 slave_startprog(phyaddr) 151 start the program on protected mode where phyaddr is the entry point 152*/ 153 154Entry(slave_startprog) 155 push %ebp 156 movl %esp, %ebp 157 158 POSTCODE(SLAVE_STARTPROG_ENTRY); 159 160 movl 0x8(%ebp), %ecx /* entry offset */ 161 movl $0x28, %ebx /* segment */ 162 push %ebx 163 push %ecx 164 165 /* set up %ds and %es */ 166 movl $0x20, %ebx 167 movw %bx, %ds 168 movw %bx, %es 169 170 POSTCODE(SLAVE_STARTPROG_EXIT); 171 172 lret 173 174 175 . = MP_BOOTGDT-MP_BOOT /* GDT location */ 176Entry(Gdt) 177 178/* Segment Descriptor 179 * 180 * 31 24 19 16 7 0 181 * ------------------------------------------------------------ 182 * | | |B| |A| | | |1|0|E|W|A| | 183 * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 | 184 * | | |D| |L| 19..16| | |1|1|C|R|A| | 185 * ------------------------------------------------------------ 186 * | | | 187 * | BASE 15..0 | LIMIT 15..0 | 188 * | | | 189 * ------------------------------------------------------------ 190 */ 191 .word 0,0 /* 0x0 : null */ 192 .byte 0,0,0,0 193 194 .word 0xffff,MP_BOOT /* 0x8 : boot code */ 195 .byte 0,0x9e,0xcf,0 196 197 .word 0xffff,MP_BOOT /* 0x10 : boot data */ 198 .byte 0,0x92,0xcf,0 199 200 .word 0xffff,MP_BOOT /* 0x18 : boot code, 16 bits */ 201 .byte 0,0x9e,0x0,0 202 203 .word 0xffff,0 /* 0x20 : init data */ 204 .byte 0,0x9f,0xcf,0 205 206 .word 0xffff,0 /* 0x28 : init code */ 207 .byte 0,0x9f,0xcf,0 208 209Entry(gdtr) 210 .short 48 /* limit (8*6 segs) */ 211 .short MP_BOOTGDT /* base low */ 212 .short 0 /* base high */ 213 214Entry(slave_boot_end) 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229