uboot/drivers/bios_emulator/x86emu/sys.c
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   1/****************************************************************************
   2*
   3*                       Realmode X86 Emulator Library
   4*
   5*               Copyright (C) 1991-2004 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:  This file includes subroutines which are related to
  36*               programmed I/O and memory access. Included in this module
  37*               are default functions that do nothing. For real uses these
  38*               functions will have to be overridden by the user library.
  39*
  40****************************************************************************/
  41
  42#include <common.h>
  43#include "x86emu/x86emui.h"
  44
  45/*------------------------- Global Variables ------------------------------*/
  46
  47X86EMU_sysEnv _X86EMU_env;      /* Global emulator machine state */
  48X86EMU_intrFuncs _X86EMU_intrTab[256];
  49
  50int debug_intr;
  51
  52/*----------------------------- Implementation ----------------------------*/
  53
  54/****************************************************************************
  55PARAMETERS:
  56addr    - Emulator memory address to read
  57
  58RETURNS:
  59Byte value read from emulator memory.
  60
  61REMARKS:
  62Reads a byte value from the emulator memory.
  63****************************************************************************/
  64u8 X86API rdb(u32 addr)
  65{
  66        return 0;
  67}
  68
  69/****************************************************************************
  70PARAMETERS:
  71addr    - Emulator memory address to read
  72
  73RETURNS:
  74Word value read from emulator memory.
  75
  76REMARKS:
  77Reads a word value from the emulator memory.
  78****************************************************************************/
  79u16 X86API rdw(u32 addr)
  80{
  81        return 0;
  82}
  83
  84/****************************************************************************
  85PARAMETERS:
  86addr    - Emulator memory address to read
  87
  88RETURNS:
  89Long value read from emulator memory.
  90REMARKS:
  91Reads a long value from the emulator memory.
  92****************************************************************************/
  93u32 X86API rdl(u32 addr)
  94{
  95        return 0;
  96}
  97
  98/****************************************************************************
  99PARAMETERS:
 100addr    - Emulator memory address to read
 101val     - Value to store
 102
 103REMARKS:
 104Writes a byte value to emulator memory.
 105****************************************************************************/
 106void X86API wrb(u32 addr, u8 val)
 107{
 108}
 109
 110/****************************************************************************
 111PARAMETERS:
 112addr    - Emulator memory address to read
 113val     - Value to store
 114
 115REMARKS:
 116Writes a word value to emulator memory.
 117****************************************************************************/
 118void X86API wrw(u32 addr, u16 val)
 119{
 120}
 121
 122/****************************************************************************
 123PARAMETERS:
 124addr    - Emulator memory address to read
 125val     - Value to store
 126
 127REMARKS:
 128Writes a long value to emulator memory.
 129****************************************************************************/
 130void X86API wrl(u32 addr, u32 val)
 131{
 132}
 133
 134/****************************************************************************
 135PARAMETERS:
 136addr    - PIO address to read
 137RETURN:
 1380
 139REMARKS:
 140Default PIO byte read function. Doesn't perform real inb.
 141****************************************************************************/
 142static u8 X86API p_inb(X86EMU_pioAddr addr)
 143{
 144        DB(if (DEBUG_IO_TRACE())
 145           printk("inb %#04x \n", addr);)
 146                return 0;
 147}
 148
 149/****************************************************************************
 150PARAMETERS:
 151addr    - PIO address to read
 152RETURN:
 1530
 154REMARKS:
 155Default PIO word read function. Doesn't perform real inw.
 156****************************************************************************/
 157static u16 X86API p_inw(X86EMU_pioAddr addr)
 158{
 159        DB(if (DEBUG_IO_TRACE())
 160           printk("inw %#04x \n", addr);)
 161                return 0;
 162}
 163
 164/****************************************************************************
 165PARAMETERS:
 166addr    - PIO address to read
 167RETURN:
 1680
 169REMARKS:
 170Default PIO long read function. Doesn't perform real inl.
 171****************************************************************************/
 172static u32 X86API p_inl(X86EMU_pioAddr addr)
 173{
 174        DB(if (DEBUG_IO_TRACE())
 175           printk("inl %#04x \n", addr);)
 176                return 0;
 177}
 178
 179/****************************************************************************
 180PARAMETERS:
 181addr    - PIO address to write
 182val     - Value to store
 183REMARKS:
 184Default PIO byte write function. Doesn't perform real outb.
 185****************************************************************************/
 186static void X86API p_outb(X86EMU_pioAddr addr, u8 val)
 187{
 188        DB(if (DEBUG_IO_TRACE())
 189           printk("outb %#02x -> %#04x \n", val, addr);)
 190                return;
 191}
 192
 193/****************************************************************************
 194PARAMETERS:
 195addr    - PIO address to write
 196val     - Value to store
 197REMARKS:
 198Default PIO word write function. Doesn't perform real outw.
 199****************************************************************************/
 200static void X86API p_outw(X86EMU_pioAddr addr, u16 val)
 201{
 202        DB(if (DEBUG_IO_TRACE())
 203           printk("outw %#04x -> %#04x \n", val, addr);)
 204                return;
 205}
 206
 207/****************************************************************************
 208PARAMETERS:
 209addr    - PIO address to write
 210val     - Value to store
 211REMARKS:
 212Default PIO ;ong write function. Doesn't perform real outl.
 213****************************************************************************/
 214static void X86API p_outl(X86EMU_pioAddr addr, u32 val)
 215{
 216        DB(if (DEBUG_IO_TRACE())
 217           printk("outl %#08x -> %#04x \n", val, addr);)
 218                return;
 219}
 220
 221/*------------------------- Global Variables ------------------------------*/
 222
 223u8(X86APIP sys_rdb) (u32 addr) = rdb;
 224u16(X86APIP sys_rdw) (u32 addr) = rdw;
 225u32(X86APIP sys_rdl) (u32 addr) = rdl;
 226void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb;
 227void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw;
 228void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl;
 229u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb;
 230u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw;
 231u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl;
 232void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb;
 233void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw;
 234void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl;
 235
 236/*----------------------------- Setup -------------------------------------*/
 237
 238/****************************************************************************
 239PARAMETERS:
 240funcs   - New memory function pointers to make active
 241
 242REMARKS:
 243This function is used to set the pointers to functions which access
 244memory space, allowing the user application to override these functions
 245and hook them out as necessary for their application.
 246****************************************************************************/
 247void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs)
 248{
 249        sys_rdb = funcs->rdb;
 250        sys_rdw = funcs->rdw;
 251        sys_rdl = funcs->rdl;
 252        sys_wrb = funcs->wrb;
 253        sys_wrw = funcs->wrw;
 254        sys_wrl = funcs->wrl;
 255}
 256
 257/****************************************************************************
 258PARAMETERS:
 259funcs   - New programmed I/O function pointers to make active
 260
 261REMARKS:
 262This function is used to set the pointers to functions which access
 263I/O space, allowing the user application to override these functions
 264and hook them out as necessary for their application.
 265****************************************************************************/
 266void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs)
 267{
 268        sys_inb = funcs->inb;
 269        sys_inw = funcs->inw;
 270        sys_inl = funcs->inl;
 271        sys_outb = funcs->outb;
 272        sys_outw = funcs->outw;
 273        sys_outl = funcs->outl;
 274}
 275
 276void X86EMU_setupIntrFunc(int intnum, X86EMU_intrFuncs func)
 277{
 278        _X86EMU_intrTab[intnum] = func;
 279}
 280
 281/****************************************************************************
 282PARAMETERS:
 283funcs   - New interrupt vector table to make active
 284
 285REMARKS:
 286This function is used to set the pointers to functions which handle
 287interrupt processing in the emulator, allowing the user application to
 288hook interrupts as necessary for their application. Any interrupts that
 289are not hooked by the user application, and reflected and handled internally
 290in the emulator via the interrupt vector table. This allows the application
 291to get control when the code being emulated executes specific software
 292interrupts.
 293****************************************************************************/
 294void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[])
 295{
 296        int i;
 297
 298        for (i = 0; i < 256; i++)
 299                _X86EMU_intrTab[i] = NULL;
 300        if (funcs) {
 301                for (i = 0; i < 256; i++)
 302                        _X86EMU_intrTab[i] = funcs[i];
 303        }
 304}
 305
 306/****************************************************************************
 307PARAMETERS:
 308int - New software interrupt to prepare for
 309
 310REMARKS:
 311This function is used to set up the emulator state to exceute a software
 312interrupt. This can be used by the user application code to allow an
 313interrupt to be hooked, examined and then reflected back to the emulator
 314so that the code in the emulator will continue processing the software
 315interrupt as per normal. This essentially allows system code to actively
 316hook and handle certain software interrupts as necessary.
 317****************************************************************************/
 318void X86EMU_prepareForInt(int num)
 319{
 320        push_word((u16) M.x86.R_FLG);
 321        CLEAR_FLAG(F_IF);
 322        CLEAR_FLAG(F_TF);
 323        push_word(M.x86.R_CS);
 324        M.x86.R_CS = mem_access_word(num * 4 + 2);
 325        push_word(M.x86.R_IP);
 326        M.x86.R_IP = mem_access_word(num * 4);
 327        M.x86.intr = 0;
 328}
 329