reactos/boot/freeldr/freeldr/include/arch.h

   1 /*
   2  *  FreeLoader
   3  *  Copyright (C) 1998-2003  Brian Palmer  <brianp@sginet.com>
   4  *
   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.
   9  *
  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.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19
  20
  21 #ifndef __ARCH_H
  22 #define __ARCH_H
  23
  24 #ifdef _M_AMD64
  25 #include <arch/amd64/amd64.h>
  26 #endif
  27
  28 /* Defines needed for switching between real and protected mode */
  29 #define NULL_DESC       0x00    /* NULL descriptor */
  30 #define PMODE_CS        0x08    /* PMode code selector, base 0 limit 4g */
  31 #define PMODE_DS        0x10    /* PMode data selector, base 0 limit 4g */
  32 #define RMODE_CS        0x18    /* RMode code selector, base 0 limit 64k */
  33 #define RMODE_DS        0x20    /* RMode data selector, base 0 limit 64k */
  34
  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 */
  37
  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 */
  40
  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 #elif defined(_M_PPC) || defined(_M_MIPS) || defined(_M_ARM)
  48 extern PVOID FsStaticBufferDisk, FsStaticBufferData;
  49 #define DISKREADBUFFER          FsStaticBufferDisk
  50 #define FILESYSBUFFER           FsStaticBufferData
  51 #endif
  52
  53 /* Makes "x" a global variable or label */
  54 #define EXTERN(x)       .global x; x:
  55
  56
  57
  58
  59 #ifndef ASM
  60
  61 #include <pshpack1.h>
  62 typedef struct
  63 {
  64         unsigned long   eax;
  65         unsigned long   ebx;
  66         unsigned long   ecx;
  67         unsigned long   edx;
  68
  69         unsigned long   esi;
  70         unsigned long   edi;
  71
  72         unsigned short  ds;
  73         unsigned short  es;
  74         unsigned short  fs;
  75         unsigned short  gs;
  76
  77         unsigned long   eflags;
  78
  79 } DWORDREGS;
  80
  81 typedef struct
  82 {
  83         unsigned short  ax, _upper_ax;
  84         unsigned short  bx, _upper_bx;
  85         unsigned short  cx, _upper_cx;
  86         unsigned short  dx, _upper_dx;
  87
  88         unsigned short  si, _upper_si;
  89         unsigned short  di, _upper_di;
  90
  91         unsigned short  ds;
  92         unsigned short  es;
  93         unsigned short  fs;
  94         unsigned short  gs;
  95
  96         unsigned short  flags, _upper_flags;
  97
  98 } WORDREGS;
  99
 100 typedef struct
 101 {
 102         unsigned char   al;
 103         unsigned char   ah;
 104         unsigned short  _upper_ax;
 105         unsigned char   bl;
 106         unsigned char   bh;
 107         unsigned short  _upper_bx;
 108         unsigned char   cl;
 109         unsigned char   ch;
 110         unsigned short  _upper_cx;
 111         unsigned char   dl;
 112         unsigned char   dh;
 113         unsigned short  _upper_dx;
 114
 115         unsigned short  si, _upper_si;
 116         unsigned short  di, _upper_di;
 117
 118         unsigned short  ds;
 119         unsigned short  es;
 120         unsigned short  fs;
 121         unsigned short  gs;
 122
 123         unsigned short  flags, _upper_flags;
 124
 125 } BYTEREGS;
 126
 127
 128 typedef union
 129 {
 130         DWORDREGS       x;
 131         DWORDREGS       d;
 132         WORDREGS        w;
 133         BYTEREGS        b;
 134 } REGS;
 135 #include <poppack.h>
 136
 137 // Int386()
 138 //
 139 // Real mode interrupt vector interface
 140 //
 141 // (E)FLAGS can *only* be returned by this function, not set.
 142 // Make sure all memory pointers are in SEG:OFFS format and
 143 // not linear addresses, unless the interrupt handler
 144 // specifically handles linear addresses.
 145 int             Int386(int ivec, REGS* in, REGS* out);
 146
 147 // Flag Masks
 148 #define I386FLAG_CF             0x0001          // Carry Flag
 149 #define I386FLAG_RESV1  0x0002          // Reserved - Must be 1
 150 #define I386FLAG_PF             0x0004          // Parity Flag
 151 #define I386FLAG_RESV2  0x0008          // Reserved - Must be 0
 152 #define I386FLAG_AF             0x0010          // Auxiliary Flag
 153 #define I386FLAG_RESV3  0x0020          // Reserved - Must be 0
 154 #define I386FLAG_ZF             0x0040          // Zero Flag
 155 #define I386FLAG_SF             0x0080          // Sign Flag
 156 #define I386FLAG_TF             0x0100          // Trap Flag (Single Step)
 157 #define I386FLAG_IF             0x0200          // Interrupt Flag
 158 #define I386FLAG_DF             0x0400          // Direction Flag
 159 #define I386FLAG_OF             0x0800          // Overflow Flag
 160
 161 // This macro tests the Carry Flag
 162 // If CF is set then the call failed (usually)
 163 #define INT386_SUCCESS(regs)    ((regs.x.eflags & I386FLAG_CF) == 0)
 164
 165 void    EnableA20(void);
 166
 167 VOID    ChainLoadBiosBootSectorCode(VOID);      // Implemented in boot.S
 168 VOID    SoftReboot(VOID);                                       // Implemented in boot.S
 169
 170 VOID    DetectHardware(VOID);           // Implemented in hardware.c
 171
 172 #endif /* ! ASM */
 173
 174
 175 #endif // #defined __ARCH_H