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 #ifndef __ASM__
  21 #pragma once
  22 #endif
  23
  24 #ifndef HEX
  25 #define HEX(y) 0x##y
  26 #endif
  27
  28 #ifdef _M_AMD64
  29 #include <arch/amd64/amd64.h>
  30 #endif
  31
  32 #if defined (_M_IX86)
  33 /* Defines needed for switching between real and protected mode */
  34 #define NULL_DESC       HEX(00) /* NULL descriptor */
  35 #define PMODE_CS        HEX(08) /* PMode code selector, base 0 limit 4g */
  36 #define PMODE_DS        HEX(10) /* PMode data selector, base 0 limit 4g */
  37 #define RMODE_CS        HEX(18) /* RMode code selector, base 0 limit 64k */
  38 #define RMODE_DS        HEX(20) /* RMode data selector, base 0 limit 64k */
  39 #endif
  40
  41 #define CR0_PE_SET      HEX(00000001)   /* OR this value with CR0 to enable pmode */
  42 #define CR0_PE_CLR      HEX(FFFFFFFE)   /* AND this value with CR0 to disable pmode */
  43
  44 #define STACK16ADDR     HEX(7000)       /* The 16-bit stack top will be at 0000:7000 */
  45 #define STACK32ADDR     HEX(78000)      /* The 32-bit stack top will be at 7000:8000, or 0x78000 */
  46
  47 #if defined (_M_IX86) || defined (_M_AMD64)
  48 #define BIOSCALLBUFFER          0x78000 /* Buffer to store temporary data for any Int386() call */
  49 #define BIOSCALLBUFSEGMENT      0x7800  /* Buffer to store temporary data for any Int386() call */
  50 #define BIOSCALLBUFOFFSET       0x0000  /* Buffer to store temporary data for any Int386() call */
  51 #define FILESYSBUFFER           0x80000 /* Buffer to store file system data (e.g. cluster buffer for FAT) */
  52 #define DISKREADBUFFER          0x90000 /* Buffer to store data read in from the disk via the BIOS */
  53 #define DISKREADBUFFER_SIZE 512
  54 #elif defined(_M_PPC) || defined(_M_MIPS)
  55 #define DISKREADBUFFER              0x80000000
  56 #define FILESYSBUFFER           0x80000000
  57 #elif defined(_M_ARM)
  58 extern ULONG gDiskReadBuffer, gFileSysBuffer;
  59 #define DISKREADBUFFER gDiskReadBuffer
  60 #define FILESYSBUFFER  gFileSysBuffer
  61 #endif
  62
  63 /* Makes "x" a global variable or label */
  64 #define EXTERN(x)       .global x; x:
  65
  66
  67 // Flag Masks
  68 #define I386FLAG_CF             HEX(0001)               // Carry Flag
  69 #define I386FLAG_RESV1  HEX(0002)               // Reserved - Must be 1
  70 #define I386FLAG_PF             HEX(0004)               // Parity Flag
  71 #define I386FLAG_RESV2  HEX(0008)               // Reserved - Must be 0
  72 #define I386FLAG_AF             HEX(0010)               // Auxiliary Flag
  73 #define I386FLAG_RESV3  HEX(0020)               // Reserved - Must be 0
  74 #define I386FLAG_ZF             HEX(0040)               // Zero Flag
  75 #define I386FLAG_SF             HEX(0080)               // Sign Flag
  76 #define I386FLAG_TF             HEX(0100)               // Trap Flag (Single Step)
  77 #define I386FLAG_IF             HEX(0200)               // Interrupt Flag
  78 #define I386FLAG_DF             HEX(0400)               // Direction Flag
  79 #define I386FLAG_OF             HEX(0800)               // Overflow Flag
  80
  81
  82 #ifndef __ASM__
  83
  84 #include <pshpack1.h>
  85 typedef struct
  86 {
  87         unsigned long   eax;
  88         unsigned long   ebx;
  89         unsigned long   ecx;
  90         unsigned long   edx;
  91
  92         unsigned long   esi;
  93         unsigned long   edi;
  94
  95         unsigned short  ds;
  96         unsigned short  es;
  97         unsigned short  fs;
  98         unsigned short  gs;
  99
 100         unsigned long   eflags;
 101
 102 } DWORDREGS;
 103
 104 typedef struct
 105 {
 106         unsigned short  ax, _upper_ax;
 107         unsigned short  bx, _upper_bx;
 108         unsigned short  cx, _upper_cx;
 109         unsigned short  dx, _upper_dx;
 110
 111         unsigned short  si, _upper_si;
 112         unsigned short  di, _upper_di;
 113
 114         unsigned short  ds;
 115         unsigned short  es;
 116         unsigned short  fs;
 117         unsigned short  gs;
 118
 119         unsigned short  flags, _upper_flags;
 120
 121 } WORDREGS;
 122
 123 typedef struct
 124 {
 125         unsigned char   al;
 126         unsigned char   ah;
 127         unsigned short  _upper_ax;
 128         unsigned char   bl;
 129         unsigned char   bh;
 130         unsigned short  _upper_bx;
 131         unsigned char   cl;
 132         unsigned char   ch;
 133         unsigned short  _upper_cx;
 134         unsigned char   dl;
 135         unsigned char   dh;
 136         unsigned short  _upper_dx;
 137
 138         unsigned short  si, _upper_si;
 139         unsigned short  di, _upper_di;
 140
 141         unsigned short  ds;
 142         unsigned short  es;
 143         unsigned short  fs;
 144         unsigned short  gs;
 145
 146         unsigned short  flags, _upper_flags;
 147
 148 } BYTEREGS;
 149
 150
 151 typedef union
 152 {
 153         DWORDREGS       x;
 154         DWORDREGS       d;
 155         WORDREGS        w;
 156         BYTEREGS        b;
 157 } REGS;
 158 #include <poppack.h>
 159
 160 // Int386()
 161 //
 162 // Real mode interrupt vector interface
 163 //
 164 // (E)FLAGS can *only* be returned by this function, not set.
 165 // Make sure all memory pointers are in SEG:OFFS format and
 166 // not linear addresses, unless the interrupt handler
 167 // specifically handles linear addresses.
 168 int             Int386(int ivec, REGS* in, REGS* out);
 169
 170 // This macro tests the Carry Flag
 171 // If CF is set then the call failed (usually)
 172 #define INT386_SUCCESS(regs)    ((regs.x.eflags & I386FLAG_CF) == 0)
 173
 174 void    EnableA20(void);
 175
 176 VOID    ChainLoadBiosBootSectorCode(VOID);      // Implemented in boot.S
 177 VOID    SoftReboot(VOID);                                       // Implemented in boot.S
 178
 179 VOID    DetectHardware(VOID);           // Implemented in hardware.c
 180
 181 #endif /* ! __ASM__ */