mirror of
https://github.com/ApfelTeeSaft/reactos.git
synced 2026-08-30 04:13:33 +00:00
Aleksey Bragin
2db25525a7
Base is FreeLdr from trunk r25063. svn path=/branches/winldr/; revision=25066
164 lines
4.5 KiB
C
164 lines
4.5 KiB
C
/*
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* FreeLoader
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* Copyright (C) 1998-2003 Brian Palmer <[email protected]>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __ARCH_H
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#define __ARCH_H
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/* Defines needed for switching between real and protected mode */
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#define NULL_DESC 0x00 /* NULL descriptor */
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#define PMODE_CS 0x08 /* PMode code selector, base 0 limit 4g */
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#define PMODE_DS 0x10 /* PMode data selector, base 0 limit 4g */
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#define RMODE_CS 0x18 /* RMode code selector, base 0 limit 64k */
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#define RMODE_DS 0x20 /* RMode data selector, base 0 limit 64k */
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#define CR0_PE_SET 0x00000001 /* OR this value with CR0 to enable pmode */
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#define CR0_PE_CLR 0xFFFFFFFE /* AND this value with CR0 to disable pmode */
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#define STACK16ADDR 0x7000 /* The 16-bit stack top will be at 0000:7000 */
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#define STACK32ADDR 0x78000 /* The 32-bit stack top will be at 7000:8000, or 0x78000 */
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#define BIOSCALLBUFFER 0x78000 /* Buffer to store temporary data for any Int386() call */
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#define BIOSCALLBUFSEGMENT 0x7800 /* Buffer to store temporary data for any Int386() call */
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#define BIOSCALLBUFOFFSET 0x0000 /* Buffer to store temporary data for any Int386() call */
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#define FILESYSBUFFER 0x80000 /* Buffer to store file system data (e.g. cluster buffer for FAT) */
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#define DISKREADBUFFER 0x90000 /* Buffer to store data read in from the disk via the BIOS */
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/* Makes "x" a global variable or label */
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#define EXTERN(x) .global x; x:
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#ifndef ASM
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typedef struct
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{
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unsigned long eax;
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unsigned long ebx;
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unsigned long ecx;
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unsigned long edx;
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unsigned long esi;
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unsigned long edi;
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unsigned short ds;
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unsigned short es;
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unsigned short fs;
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unsigned short gs;
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unsigned long eflags;
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} PACKED DWORDREGS;
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typedef struct
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{
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unsigned short ax, _upper_ax;
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unsigned short bx, _upper_bx;
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unsigned short cx, _upper_cx;
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unsigned short dx, _upper_dx;
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unsigned short si, _upper_si;
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unsigned short di, _upper_di;
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unsigned short ds;
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unsigned short es;
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unsigned short fs;
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unsigned short gs;
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unsigned short flags, _upper_flags;
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} PACKED WORDREGS;
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typedef struct
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{
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unsigned char al;
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unsigned char ah;
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unsigned short _upper_ax;
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unsigned char bl;
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unsigned char bh;
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unsigned short _upper_bx;
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unsigned char cl;
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unsigned char ch;
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unsigned short _upper_cx;
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unsigned char dl;
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unsigned char dh;
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unsigned short _upper_dx;
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unsigned short si, _upper_si;
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unsigned short di, _upper_di;
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unsigned short ds;
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unsigned short es;
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unsigned short fs;
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unsigned short gs;
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unsigned short flags, _upper_flags;
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} PACKED BYTEREGS;
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typedef union
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{
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DWORDREGS x;
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DWORDREGS d;
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WORDREGS w;
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BYTEREGS b;
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} REGS;
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// Int386()
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//
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// Real mode interrupt vector interface
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//
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// (E)FLAGS can *only* be returned by this function, not set.
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// Make sure all memory pointers are in SEG:OFFS format and
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// not linear addresses, unless the interrupt handler
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// specifically handles linear addresses.
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int Int386(int ivec, REGS* in, REGS* out);
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// Flag Masks
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#define I386FLAG_CF 0x0001 // Carry Flag
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#define I386FLAG_RESV1 0x0002 // Reserved - Must be 1
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#define I386FLAG_PF 0x0004 // Parity Flag
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#define I386FLAG_RESV2 0x0008 // Reserved - Must be 0
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#define I386FLAG_AF 0x0010 // Auxiliary Flag
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#define I386FLAG_RESV3 0x0020 // Reserved - Must be 0
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#define I386FLAG_ZF 0x0040 // Zero Flag
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#define I386FLAG_SF 0x0080 // Sign Flag
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#define I386FLAG_TF 0x0100 // Trap Flag (Single Step)
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#define I386FLAG_IF 0x0200 // Interrupt Flag
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#define I386FLAG_DF 0x0400 // Direction Flag
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#define I386FLAG_OF 0x0800 // Overflow Flag
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// This macro tests the Carry Flag
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// If CF is set then the call failed (usually)
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#define INT386_SUCCESS(regs) ((regs.x.eflags & I386FLAG_CF) == 0)
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void EnableA20(void);
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VOID ChainLoadBiosBootSectorCode(VOID); // Implemented in boot.S
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VOID SoftReboot(VOID); // Implemented in boot.S
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VOID DetectHardware(VOID); // Implemented in hardware.c
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#endif /* ! ASM */
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#endif // #defined __ARCH_H
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