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 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.
  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 #if defined (_M_IX86)
  29 /* Defines needed for switching between real and protected mode */
  30 #define NULL_DESC       0x00    /* NULL descriptor */
  31 #define PMODE_CS        0x08    /* PMode code selector, base 0 limit 4g */
  32 #define PMODE_DS        0x10    /* PMode data selector, base 0 limit 4g */
  33 #define RMODE_CS        0x18    /* RMode code selector, base 0 limit 64k */
  34 #define RMODE_DS        0x20    /* RMode data selector, base 0 limit 64k */
  35 #endif
  36
  37 #define CR0_PE_SET      0x00000001      /* OR this value with CR0 to enable pmode */
  38 #define CR0_PE_CLR      0xFFFFFFFE      /* AND this value with CR0 to disable pmode */
  39
  40 #define STACK16ADDR     0x7000  /* The 16-bit stack top will be at 0000:7000 */
  41 #define STACK32ADDR     0x78000 /* The 32-bit stack top will be at 7000:8000, or 0x78000 */
  42
  43 #if defined (_M_IX86) || defined (_M_AMD64)
  44 #define BIOSCALLBUFFER          0x78000 /* Buffer to store temporary data for any Int386() call */
  45 #define BIOSCALLBUFSEGMENT      0x7800  /* Buffer to store temporary data for any Int386() call */
  46 #define BIOSCALLBUFOFFSET       0x0000  /* Buffer to store temporary data for any Int386() call */
  47 #define FILESYSBUFFER           0x80000 /* Buffer to store file system data (e.g. cluster buffer for FAT) */
  48 #define DISKREADBUFFER          0x90000 /* Buffer to store data read in from the disk via the BIOS */
  49 #define DISKREADBUFFER_SIZE 512
  50 #elif defined(_M_PPC) || defined(_M_MIPS) || defined(_M_ARM)
  51 #define DISKREADBUFFER              0x80000000
  52 #define FILESYSBUFFER           0x80000000
  53 #endif
  54
  55 /* Makes "x" a global variable or label */
  56 #define EXTERN(x)       .global x; x:
  57
  58
  59
  60
  61 #ifndef ASM
  62
  63 #include <pshpack1.h>
  64 typedef struct
  65 {
  66         unsigned long   eax;
  67         unsigned long   ebx;
  68         unsigned long   ecx;
  69         unsigned long   edx;
  70
  71         unsigned long   esi;
  72         unsigned long   edi;
  73
  74         unsigned short  ds;
  75         unsigned short  es;
  76         unsigned short  fs;
  77         unsigned short  gs;
  78
  79         unsigned long   eflags;
  80
  81 } DWORDREGS;
  82
  83 typedef struct
  84 {
  85         unsigned short  ax, _upper_ax;
  86         unsigned short  bx, _upper_bx;
  87         unsigned short  cx, _upper_cx;
  88         unsigned short  dx, _upper_dx;
  89
  90         unsigned short  si, _upper_si;
  91         unsigned short  di, _upper_di;
  92
  93         unsigned short  ds;
  94         unsigned short  es;
  95         unsigned short  fs;
  96         unsigned short  gs;
  97
  98         unsigned short  flags, _upper_flags;
  99
 100 } WORDREGS;
 101
 102 typedef struct
 103 {
 104         unsigned char   al;
 105         unsigned char   ah;
 106         unsigned short  _upper_ax;
 107         unsigned char   bl;
 108         unsigned char   bh;
 109         unsigned short  _upper_bx;
 110         unsigned char   cl;
 111         unsigned char   ch;
 112         unsigned short  _upper_cx;
 113         unsigned char   dl;
 114         unsigned char   dh;
 115         unsigned short  _upper_dx;
 116
 117         unsigned short  si, _upper_si;
 118         unsigned short  di, _upper_di;
 119
 120         unsigned short  ds;
 121         unsigned short  es;
 122         unsigned short  fs;
 123         unsigned short  gs;
 124
 125         unsigned short  flags, _upper_flags;
 126
 127 } BYTEREGS;
 128
 129
 130 typedef union
 131 {
 132         DWORDREGS       x;
 133         DWORDREGS       d;
 134         WORDREGS        w;
 135         BYTEREGS        b;
 136 } REGS;
 137 #include <poppack.h>
 138
 139 // Int386()
 140 //
 141 // Real mode interrupt vector interface
 142 //
 143 // (E)FLAGS can *only* be returned by this function, not set.
 144 // Make sure all memory pointers are in SEG:OFFS format and
 145 // not linear addresses, unless the interrupt handler
 146 // specifically handles linear addresses.
 147 int             Int386(int ivec, REGS* in, REGS* out);
 148
 149 // Flag Masks
 150 #define I386FLAG_CF             0x0001          // Carry Flag
 151 #define I386FLAG_RESV1  0x0002          // Reserved - Must be 1
 152 #define I386FLAG_PF             0x0004          // Parity Flag
 153 #define I386FLAG_RESV2  0x0008          // Reserved - Must be 0
 154 #define I386FLAG_AF             0x0010          // Auxiliary Flag
 155 #define I386FLAG_RESV3  0x0020          // Reserved - Must be 0
 156 #define I386FLAG_ZF             0x0040          // Zero Flag
 157 #define I386FLAG_SF             0x0080          // Sign Flag
 158 #define I386FLAG_TF             0x0100          // Trap Flag (Single Step)
 159 #define I386FLAG_IF             0x0200          // Interrupt Flag
 160 #define I386FLAG_DF             0x0400          // Direction Flag
 161 #define I386FLAG_OF             0x0800          // Overflow Flag
 162
 163 // This macro tests the Carry Flag
 164 // If CF is set then the call failed (usually)
 165 #define INT386_SUCCESS(regs)    ((regs.x.eflags & I386FLAG_CF) == 0)
 166
 167 void    EnableA20(void);
 168
 169 VOID    ChainLoadBiosBootSectorCode(VOID);      // Implemented in boot.S
 170 VOID    SoftReboot(VOID);                                       // Implemented in boot.S
 171
 172 VOID    DetectHardware(VOID);           // Implemented in hardware.c
 173
 174 #endif /* ! ASM */
 175
 176
 177 #endif // #defined __ARCH_H