3 * Copyright (C) 1998-2003 Brian Palmer <brianp@sginet.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <arch/amd64/amd64.h>
27 /* Defines needed for switching between real and protected mode */
28 #define NULL_DESC 0x00 /* NULL descriptor */
29 #define PMODE_CS 0x08 /* PMode code selector, base 0 limit 4g */
30 #define PMODE_DS 0x10 /* PMode data selector, base 0 limit 4g */
31 #define RMODE_CS 0x18 /* RMode code selector, base 0 limit 64k */
32 #define RMODE_DS 0x20 /* RMode data selector, base 0 limit 64k */
35 #define CR0_PE_SET 0x00000001 /* OR this value with CR0 to enable pmode */
36 #define CR0_PE_CLR 0xFFFFFFFE /* AND this value with CR0 to disable pmode */
38 #define STACK16ADDR 0x7000 /* The 16-bit stack top will be at 0000:7000 */
39 #define STACK32ADDR 0x78000 /* The 32-bit stack top will be at 7000:8000, or 0x78000 */
41 #if defined (_M_IX86) || defined (_M_AMD64)
42 #define BIOSCALLBUFFER 0x78000 /* Buffer to store temporary data for any Int386() call */
43 #define BIOSCALLBUFSEGMENT 0x7800 /* Buffer to store temporary data for any Int386() call */
44 #define BIOSCALLBUFOFFSET 0x0000 /* Buffer to store temporary data for any Int386() call */
45 #define FILESYSBUFFER 0x80000 /* Buffer to store file system data (e.g. cluster buffer for FAT) */
46 #define DISKREADBUFFER 0x90000 /* Buffer to store data read in from the disk via the BIOS */
47 #define DISKREADBUFFER_SIZE 512
48 #elif defined(_M_PPC) || defined(_M_MIPS)
49 #define DISKREADBUFFER 0x80000000
50 #define FILESYSBUFFER 0x80000000
52 extern ULONG gDiskReadBuffer
, gFileSysBuffer
;
53 #define DISKREADBUFFER gDiskReadBuffer
54 #define FILESYSBUFFER gFileSysBuffer
57 /* Makes "x" a global variable or label */
58 #define EXTERN(x) .global x; x:
87 unsigned short ax
, _upper_ax
;
88 unsigned short bx
, _upper_bx
;
89 unsigned short cx
, _upper_cx
;
90 unsigned short dx
, _upper_dx
;
92 unsigned short si
, _upper_si
;
93 unsigned short di
, _upper_di
;
100 unsigned short flags
, _upper_flags
;
108 unsigned short _upper_ax
;
111 unsigned short _upper_bx
;
114 unsigned short _upper_cx
;
117 unsigned short _upper_dx
;
119 unsigned short si
, _upper_si
;
120 unsigned short di
, _upper_di
;
127 unsigned short flags
, _upper_flags
;
143 // Real mode interrupt vector interface
145 // (E)FLAGS can *only* be returned by this function, not set.
146 // Make sure all memory pointers are in SEG:OFFS format and
147 // not linear addresses, unless the interrupt handler
148 // specifically handles linear addresses.
149 int Int386(int ivec
, REGS
* in
, REGS
* out
);
152 #define I386FLAG_CF 0x0001 // Carry Flag
153 #define I386FLAG_RESV1 0x0002 // Reserved - Must be 1
154 #define I386FLAG_PF 0x0004 // Parity Flag
155 #define I386FLAG_RESV2 0x0008 // Reserved - Must be 0
156 #define I386FLAG_AF 0x0010 // Auxiliary Flag
157 #define I386FLAG_RESV3 0x0020 // Reserved - Must be 0
158 #define I386FLAG_ZF 0x0040 // Zero Flag
159 #define I386FLAG_SF 0x0080 // Sign Flag
160 #define I386FLAG_TF 0x0100 // Trap Flag (Single Step)
161 #define I386FLAG_IF 0x0200 // Interrupt Flag
162 #define I386FLAG_DF 0x0400 // Direction Flag
163 #define I386FLAG_OF 0x0800 // Overflow Flag
165 // This macro tests the Carry Flag
166 // If CF is set then the call failed (usually)
167 #define INT386_SUCCESS(regs) ((regs.x.eflags & I386FLAG_CF) == 0)
169 void EnableA20(void);
171 VOID
ChainLoadBiosBootSectorCode(VOID
); // Implemented in boot.S
172 VOID
SoftReboot(VOID
); // Implemented in boot.S
174 VOID
DetectHardware(VOID
); // Implemented in hardware.c