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 #pragma once
  21
  22 #ifdef _M_AMD64
  23 #include <arch/amd64/amd64.h>
  24 #endif
  25
  26 #if defined (_M_IX86)
  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 */
  33 #endif
  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 #define DISKREADBUFFER_SIZE 512
  48 #elif defined(_M_PPC) || defined(_M_MIPS)
  49 #define DISKREADBUFFER              0x80000000
  50 #define FILESYSBUFFER           0x80000000
  51 #elif defined(_M_ARM)
  52 extern ULONG gDiskReadBuffer, gFileSysBuffer;
  53 #define DISKREADBUFFER gDiskReadBuffer
  54 #define FILESYSBUFFER  gFileSysBuffer
  55 #endif
  56
  57 /* Makes "x" a global variable or label */
  58 #define EXTERN(x)       .global x; x:
  59
  60
  61 // Flag Masks
  62 #define I386FLAG_CF             0x0001          // Carry Flag
  63 #define I386FLAG_RESV1  0x0002          // Reserved - Must be 1
  64 #define I386FLAG_PF             0x0004          // Parity Flag
  65 #define I386FLAG_RESV2  0x0008          // Reserved - Must be 0
  66 #define I386FLAG_AF             0x0010          // Auxiliary Flag
  67 #define I386FLAG_RESV3  0x0020          // Reserved - Must be 0
  68 #define I386FLAG_ZF             0x0040          // Zero Flag
  69 #define I386FLAG_SF             0x0080          // Sign Flag
  70 #define I386FLAG_TF             0x0100          // Trap Flag (Single Step)
  71 #define I386FLAG_IF             0x0200          // Interrupt Flag
  72 #define I386FLAG_DF             0x0400          // Direction Flag
  73 #define I386FLAG_OF             0x0800          // Overflow Flag
  74
  75
  76 #ifndef ASM
  77
  78 #include <pshpack1.h>
  79 typedef struct
  80 {
  81         unsigned long   eax;
  82         unsigned long   ebx;
  83         unsigned long   ecx;
  84         unsigned long   edx;
  85
  86         unsigned long   esi;
  87         unsigned long   edi;
  88
  89         unsigned short  ds;
  90         unsigned short  es;
  91         unsigned short  fs;
  92         unsigned short  gs;
  93
  94         unsigned long   eflags;
  95
  96 } DWORDREGS;
  97
  98 typedef struct
  99 {
 100         unsigned short  ax, _upper_ax;
 101         unsigned short  bx, _upper_bx;
 102         unsigned short  cx, _upper_cx;
 103         unsigned short  dx, _upper_dx;
 104
 105         unsigned short  si, _upper_si;
 106         unsigned short  di, _upper_di;
 107
 108         unsigned short  ds;
 109         unsigned short  es;
 110         unsigned short  fs;
 111         unsigned short  gs;
 112
 113         unsigned short  flags, _upper_flags;
 114
 115 } WORDREGS;
 116
 117 typedef struct
 118 {
 119         unsigned char   al;
 120         unsigned char   ah;
 121         unsigned short  _upper_ax;
 122         unsigned char   bl;
 123         unsigned char   bh;
 124         unsigned short  _upper_bx;
 125         unsigned char   cl;
 126         unsigned char   ch;
 127         unsigned short  _upper_cx;
 128         unsigned char   dl;
 129         unsigned char   dh;
 130         unsigned short  _upper_dx;
 131
 132         unsigned short  si, _upper_si;
 133         unsigned short  di, _upper_di;
 134
 135         unsigned short  ds;
 136         unsigned short  es;
 137         unsigned short  fs;
 138         unsigned short  gs;
 139
 140         unsigned short  flags, _upper_flags;
 141
 142 } BYTEREGS;
 143
 144
 145 typedef union
 146 {
 147         DWORDREGS       x;
 148         DWORDREGS       d;
 149         WORDREGS        w;
 150         BYTEREGS        b;
 151 } REGS;
 152 #include <poppack.h>
 153
 154 // Int386()
 155 //
 156 // Real mode interrupt vector interface
 157 //
 158 // (E)FLAGS can *only* be returned by this function, not set.
 159 // Make sure all memory pointers are in SEG:OFFS format and
 160 // not linear addresses, unless the interrupt handler
 161 // specifically handles linear addresses.
 162 int             Int386(int ivec, REGS* in, REGS* out);
 163
 164 // This macro tests the Carry Flag
 165 // If CF is set then the call failed (usually)
 166 #define INT386_SUCCESS(regs)    ((regs.x.eflags & I386FLAG_CF) == 0)
 167
 168 void    EnableA20(void);
 169
 170 VOID    ChainLoadBiosBootSectorCode(VOID);      // Implemented in boot.S
 171 VOID    SoftReboot(VOID);                                       // Implemented in boot.S
 172
 173 VOID    DetectHardware(VOID);           // Implemented in hardware.c
 174
 175 #endif /* ! ASM */