board/MAI/bios_emulator/scitech/include/x86emu/regs.h

   1 /****************************************************************************
   2 *
   3 *                       Realmode X86 Emulator Library
   4 *
   5 *               Copyright (C) 1996-1999 SciTech Software, Inc.
   6 *                    Copyright (C) David Mosberger-Tang
   7 *                      Copyright (C) 1999 Egbert Eich
   8 *
   9 *  ========================================================================
  10 *
  11 *  Permission to use, copy, modify, distribute, and sell this software and
  12 *  its documentation for any purpose is hereby granted without fee,
  13 *  provided that the above copyright notice appear in all copies and that
  14 *  both that copyright notice and this permission notice appear in
  15 *  supporting documentation, and that the name of the authors not be used
  16 *  in advertising or publicity pertaining to distribution of the software
  17 *  without specific, written prior permission.  The authors makes no
  18 *  representations about the suitability of this software for any purpose.
  19 *  It is provided "as is" without express or implied warranty.
  20 *
  21 *  THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  22 *  INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  23 *  EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  24 *  CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
  25 *  USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
  26 *  OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  27 *  PERFORMANCE OF THIS SOFTWARE.
  28 *
  29 *  ========================================================================
  30 *
  31 * Language:     ANSI C
  32 * Environment:  Any
  33 * Developer:    Kendall Bennett
  34 *
  35 * Description:  Header file for x86 register definitions.
  36 *
  37 ****************************************************************************/
  38
  39 #ifndef __X86EMU_REGS_H
  40 #define __X86EMU_REGS_H
  41
  42 /*---------------------- Macros and type definitions ----------------------*/
  43
  44 #pragma pack(1)
  45
  46 /*
  47  * General EAX, EBX, ECX, EDX type registers.  Note that for
  48  * portability, and speed, the issue of byte swapping is not addressed
  49  * in the registers.  All registers are stored in the default format
  50  * available on the host machine.  The only critical issue is that the
  51  * registers should line up EXACTLY in the same manner as they do in
  52  * the 386.  That is:
  53  *
  54  * EAX & 0xff  === AL
  55  * EAX & 0xffff == AX
  56  *
  57  * etc.  The result is that alot of the calculations can then be
  58  * done using the native instruction set fully.
  59  */
  60
  61 #ifdef  __BIG_ENDIAN__
  62
  63 typedef struct {
  64     u32 e_reg;
  65     } I32_reg_t;
  66
  67 typedef struct {
  68     u16 filler0, x_reg;
  69     } I16_reg_t;
  70
  71 typedef struct {
  72     u8 filler0, filler1, h_reg, l_reg;
  73     } I8_reg_t;
  74
  75 #else /* !__BIG_ENDIAN__ */
  76
  77 typedef struct {
  78     u32 e_reg;
  79     } I32_reg_t;
  80
  81 typedef struct {
  82     u16 x_reg;
  83     } I16_reg_t;
  84
  85 typedef struct {
  86     u8 l_reg, h_reg;
  87     } I8_reg_t;
  88
  89 #endif /* BIG_ENDIAN */
  90
  91 typedef union {
  92     I32_reg_t   I32_reg;
  93     I16_reg_t   I16_reg;
  94     I8_reg_t    I8_reg;
  95     } i386_general_register;
  96
  97 struct i386_general_regs {
  98     i386_general_register A, B, C, D;
  99     };
 100
 101 typedef struct i386_general_regs Gen_reg_t;
 102
 103 struct i386_special_regs {
 104     i386_general_register SP, BP, SI, DI, IP;
 105     u32 FLAGS;
 106     };
 107
 108 /*
 109  * Segment registers here represent the 16 bit quantities
 110  * CS, DS, ES, SS.
 111  */
 112
 113 struct i386_segment_regs {
 114     u16 CS, DS, SS, ES, FS, GS;
 115     };
 116
 117 /* 8 bit registers */
 118 #define R_AH  gen.A.I8_reg.h_reg
 119 #define R_AL  gen.A.I8_reg.l_reg
 120 #define R_BH  gen.B.I8_reg.h_reg
 121 #define R_BL  gen.B.I8_reg.l_reg
 122 #define R_CH  gen.C.I8_reg.h_reg
 123 #define R_CL  gen.C.I8_reg.l_reg
 124 #define R_DH  gen.D.I8_reg.h_reg
 125 #define R_DL  gen.D.I8_reg.l_reg
 126
 127 /* 16 bit registers */
 128 #define R_AX  gen.A.I16_reg.x_reg
 129 #define R_BX  gen.B.I16_reg.x_reg
 130 #define R_CX  gen.C.I16_reg.x_reg
 131 #define R_DX  gen.D.I16_reg.x_reg
 132
 133 /* 32 bit extended registers */
 134 #define R_EAX  gen.A.I32_reg.e_reg
 135 #define R_EBX  gen.B.I32_reg.e_reg
 136 #define R_ECX  gen.C.I32_reg.e_reg
 137 #define R_EDX  gen.D.I32_reg.e_reg
 138
 139 /* special registers */
 140 #define R_SP  spc.SP.I16_reg.x_reg
 141 #define R_BP  spc.BP.I16_reg.x_reg
 142 #define R_SI  spc.SI.I16_reg.x_reg
 143 #define R_DI  spc.DI.I16_reg.x_reg
 144 #define R_IP  spc.IP.I16_reg.x_reg
 145 #define R_FLG spc.FLAGS
 146
 147 /* special registers */
 148 #define R_SP  spc.SP.I16_reg.x_reg
 149 #define R_BP  spc.BP.I16_reg.x_reg
 150 #define R_SI  spc.SI.I16_reg.x_reg
 151 #define R_DI  spc.DI.I16_reg.x_reg
 152 #define R_IP  spc.IP.I16_reg.x_reg
 153 #define R_FLG spc.FLAGS
 154
 155 /* special registers */
 156 #define R_ESP  spc.SP.I32_reg.e_reg
 157 #define R_EBP  spc.BP.I32_reg.e_reg
 158 #define R_ESI  spc.SI.I32_reg.e_reg
 159 #define R_EDI  spc.DI.I32_reg.e_reg
 160 #define R_EIP  spc.IP.I32_reg.e_reg
 161 #define R_EFLG spc.FLAGS
 162
 163 /* segment registers */
 164 #define R_CS  seg.CS
 165 #define R_DS  seg.DS
 166 #define R_SS  seg.SS
 167 #define R_ES  seg.ES
 168 #define R_FS  seg.FS
 169 #define R_GS  seg.GS
 170
 171 /* flag conditions   */
 172 #define FB_CF 0x0001            /* CARRY flag  */
 173 #define FB_PF 0x0004            /* PARITY flag */
 174 #define FB_AF 0x0010            /* AUX  flag   */
 175 #define FB_ZF 0x0040            /* ZERO flag   */
 176 #define FB_SF 0x0080            /* SIGN flag   */
 177 #define FB_TF 0x0100            /* TRAP flag   */
 178 #define FB_IF 0x0200            /* INTERRUPT ENABLE flag */
 179 #define FB_DF 0x0400            /* DIR flag    */
 180 #define FB_OF 0x0800            /* OVERFLOW flag */
 181
 182 /* 80286 and above always have bit#1 set */
 183 #define F_ALWAYS_ON  (0x0002)   /* flag bits always on */
 184
 185 /*
 186  * Define a mask for only those flag bits we will ever pass back
 187  * (via PUSHF)
 188  */
 189 #define F_MSK (FB_CF|FB_PF|FB_AF|FB_ZF|FB_SF|FB_TF|FB_IF|FB_DF|FB_OF)
 190
 191 /* following bits masked in to a 16bit quantity */
 192
 193 #define F_CF 0x0001             /* CARRY flag  */
 194 #define F_PF 0x0004             /* PARITY flag */
 195 #define F_AF 0x0010             /* AUX  flag   */
 196 #define F_ZF 0x0040             /* ZERO flag   */
 197 #define F_SF 0x0080             /* SIGN flag   */
 198 #define F_TF 0x0100             /* TRAP flag   */
 199 #define F_IF 0x0200             /* INTERRUPT ENABLE flag */
 200 #define F_DF 0x0400             /* DIR flag    */
 201 #define F_OF 0x0800             /* OVERFLOW flag */
 202
 203 #define TOGGLE_FLAG(flag)       (M.x86.R_FLG ^= (flag))
 204 #define SET_FLAG(flag)          (M.x86.R_FLG |= (flag))
 205 #define CLEAR_FLAG(flag)        (M.x86.R_FLG &= ~(flag))
 206 #define ACCESS_FLAG(flag)       (M.x86.R_FLG & (flag))
 207 #define CLEARALL_FLAG(m)        (M.x86.R_FLG = 0)
 208
 209 #define CONDITIONAL_SET_FLAG(COND,FLAG) \
 210   if (COND) SET_FLAG(FLAG); else CLEAR_FLAG(FLAG)
 211
 212 #define F_PF_CALC 0x010000      /* PARITY flag has been calced    */
 213 #define F_ZF_CALC 0x020000      /* ZERO flag has been calced      */
 214 #define F_SF_CALC 0x040000      /* SIGN flag has been calced      */
 215
 216 #define F_ALL_CALC      0xff0000        /* All have been calced   */
 217
 218 /*
 219  * Emulator machine state.
 220  * Segment usage control.
 221  */
 222 #define SYSMODE_SEG_DS_SS       0x00000001
 223 #define SYSMODE_SEGOVR_CS       0x00000002
 224 #define SYSMODE_SEGOVR_DS       0x00000004
 225 #define SYSMODE_SEGOVR_ES       0x00000008
 226 #define SYSMODE_SEGOVR_FS       0x00000010
 227 #define SYSMODE_SEGOVR_GS       0x00000020
 228 #define SYSMODE_SEGOVR_SS       0x00000040
 229 #define SYSMODE_PREFIX_REPE     0x00000080
 230 #define SYSMODE_PREFIX_REPNE    0x00000100
 231 #define SYSMODE_PREFIX_DATA     0x00000200
 232 #define SYSMODE_PREFIX_ADDR     0x00000400
 233 #define SYSMODE_INTR_PENDING    0x10000000
 234 #define SYSMODE_EXTRN_INTR      0x20000000
 235 #define SYSMODE_HALTED          0x40000000
 236
 237 #define SYSMODE_SEGMASK (SYSMODE_SEG_DS_SS      | \
 238                          SYSMODE_SEGOVR_CS      | \
 239                          SYSMODE_SEGOVR_DS      | \
 240                          SYSMODE_SEGOVR_ES      | \
 241                          SYSMODE_SEGOVR_FS      | \
 242                          SYSMODE_SEGOVR_GS      | \
 243                          SYSMODE_SEGOVR_SS)
 244 #define SYSMODE_CLRMASK (SYSMODE_SEG_DS_SS      | \
 245                          SYSMODE_SEGOVR_CS      | \
 246                          SYSMODE_SEGOVR_DS      | \
 247                          SYSMODE_SEGOVR_ES      | \
 248                          SYSMODE_SEGOVR_FS      | \
 249                          SYSMODE_SEGOVR_GS      | \
 250                          SYSMODE_SEGOVR_SS      | \
 251                          SYSMODE_PREFIX_DATA    | \
 252                          SYSMODE_PREFIX_ADDR)
 253
 254 #define  INTR_SYNCH           0x1
 255 #define  INTR_ASYNCH          0x2
 256 #define  INTR_HALTED          0x4
 257
 258 typedef struct {
 259     struct i386_general_regs    gen;
 260     struct i386_special_regs    spc;
 261     struct i386_segment_regs    seg;
 262     /*
 263      * MODE contains information on:
 264      *  REPE prefix             2 bits  repe,repne
 265      *  SEGMENT overrides       5 bits  normal,DS,SS,CS,ES
 266      *  Delayed flag set        3 bits  (zero, signed, parity)
 267      *  reserved                6 bits
 268      *  interrupt #             8 bits  instruction raised interrupt
 269      *  BIOS video segregs      4 bits
 270      *  Interrupt Pending       1 bits
 271      *  Extern interrupt        1 bits
 272      *  Halted                  1 bits
 273      */
 274     long                        mode;
 275     u8                          intno;
 276     volatile int                intr;   /* mask of pending interrupts */
 277     int                         debug;
 278 #ifdef DEBUG
 279     int                         check;
 280     u16                         saved_ip;
 281     u16                         saved_cs;
 282     int                         enc_pos;
 283     int                         enc_str_pos;
 284     char                        decode_buf[32]; /* encoded byte stream  */
 285     char                        decoded_buf[256]; /* disassembled strings */
 286 #endif
 287     } X86EMU_regs;
 288
 289 /****************************************************************************
 290 REMARKS:
 291 Structure maintaining the emulator machine state.
 292
 293 MEMBERS:
 294 x86             - X86 registers
 295 mem_base        - Base real mode memory for the emulator
 296 mem_size        - Size of the real mode memory block for the emulator
 297 ****************************************************************************/
 298 typedef struct {
 299     X86EMU_regs     x86;
 300     unsigned long   mem_base;
 301     unsigned long   mem_size;
 302     void*           private;
 303     } X86EMU_sysEnv;
 304
 305 #pragma pack()
 306
 307 /*----------------------------- Global Variables --------------------------*/
 308
 309 #ifdef  __cplusplus
 310 extern "C" {                        /* Use "C" linkage when in C++ mode */
 311 #endif
 312
 313 /* Global emulator machine state.
 314  *
 315  * We keep it global to avoid pointer dereferences in the code for speed.
 316  */
 317
 318 extern    X86EMU_sysEnv _X86EMU_env;
 319 #define   M             _X86EMU_env
 320
 321 /*-------------------------- Function Prototypes --------------------------*/
 322
 323 /* Function to log information at runtime */
 324
 325 /*void    printk(const char *fmt, ...); */
 326
 327 #ifdef  __cplusplus
 328 }                                   /* End of "C" linkage for C++       */
 329 #endif
 330
 331 #endif /* __X86EMU_REGS_H */