329 lines
10 KiB
C
329 lines
10 KiB
C
/****************************************************************************
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*
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* Realmode X86 Emulator Library
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*
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* Copyright (C) 1991-2004 SciTech Software, Inc.
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* Copyright (C) David Mosberger-Tang
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* Copyright (C) 1999 Egbert Eich
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*
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* ========================================================================
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation, and that the name of the authors not be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The authors makes no
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* representations about the suitability of this software for any purpose.
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* It is provided "as is" without express or implied warranty.
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*
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* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* ========================================================================
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*
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* Language: ANSI C
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* Environment: Any
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* Developer: Kendall Bennett
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*
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* Description: This file includes subroutines which are related to
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* programmed I/O and memory access. Included in this module
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* are default functions that do nothing. For real uses these
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* functions will have to be overriden by the user library.
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*
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****************************************************************************/
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#include <common.h>
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#include "x86emu/x86emui.h"
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/*------------------------- Global Variables ------------------------------*/
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X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */
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X86EMU_intrFuncs _X86EMU_intrTab[256];
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int debug_intr;
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/*----------------------------- Implementation ----------------------------*/
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/****************************************************************************
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PARAMETERS:
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addr - Emulator memory address to read
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RETURNS:
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Byte value read from emulator memory.
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REMARKS:
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Reads a byte value from the emulator memory.
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****************************************************************************/
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u8 X86API rdb(u32 addr)
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{
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return 0;
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}
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/****************************************************************************
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PARAMETERS:
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addr - Emulator memory address to read
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RETURNS:
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Word value read from emulator memory.
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REMARKS:
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Reads a word value from the emulator memory.
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****************************************************************************/
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u16 X86API rdw(u32 addr)
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{
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return 0;
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}
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/****************************************************************************
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PARAMETERS:
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addr - Emulator memory address to read
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RETURNS:
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Long value read from emulator memory.
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REMARKS:
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Reads a long value from the emulator memory.
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****************************************************************************/
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u32 X86API rdl(u32 addr)
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{
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return 0;
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}
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/****************************************************************************
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PARAMETERS:
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addr - Emulator memory address to read
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val - Value to store
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REMARKS:
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Writes a byte value to emulator memory.
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****************************************************************************/
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void X86API wrb(u32 addr, u8 val)
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{
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}
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/****************************************************************************
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PARAMETERS:
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addr - Emulator memory address to read
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val - Value to store
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REMARKS:
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Writes a word value to emulator memory.
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****************************************************************************/
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void X86API wrw(u32 addr, u16 val)
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{
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}
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/****************************************************************************
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PARAMETERS:
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addr - Emulator memory address to read
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val - Value to store
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REMARKS:
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Writes a long value to emulator memory.
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****************************************************************************/
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void X86API wrl(u32 addr, u32 val)
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{
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}
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/****************************************************************************
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PARAMETERS:
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addr - PIO address to read
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RETURN:
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0
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REMARKS:
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Default PIO byte read function. Doesn't perform real inb.
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****************************************************************************/
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static u8 X86API p_inb(X86EMU_pioAddr addr)
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{
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DB(if (DEBUG_IO_TRACE())
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printk("inb %#04x \n", addr);)
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return 0;
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}
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/****************************************************************************
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PARAMETERS:
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addr - PIO address to read
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RETURN:
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0
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REMARKS:
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Default PIO word read function. Doesn't perform real inw.
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****************************************************************************/
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static u16 X86API p_inw(X86EMU_pioAddr addr)
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{
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DB(if (DEBUG_IO_TRACE())
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printk("inw %#04x \n", addr);)
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return 0;
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}
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/****************************************************************************
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PARAMETERS:
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addr - PIO address to read
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RETURN:
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0
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REMARKS:
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Default PIO long read function. Doesn't perform real inl.
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****************************************************************************/
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static u32 X86API p_inl(X86EMU_pioAddr addr)
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{
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DB(if (DEBUG_IO_TRACE())
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printk("inl %#04x \n", addr);)
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return 0;
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}
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/****************************************************************************
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PARAMETERS:
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addr - PIO address to write
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val - Value to store
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REMARKS:
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Default PIO byte write function. Doesn't perform real outb.
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****************************************************************************/
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static void X86API p_outb(X86EMU_pioAddr addr, u8 val)
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{
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DB(if (DEBUG_IO_TRACE())
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printk("outb %#02x -> %#04x \n", val, addr);)
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return;
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}
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/****************************************************************************
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PARAMETERS:
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addr - PIO address to write
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val - Value to store
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REMARKS:
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Default PIO word write function. Doesn't perform real outw.
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****************************************************************************/
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static void X86API p_outw(X86EMU_pioAddr addr, u16 val)
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{
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DB(if (DEBUG_IO_TRACE())
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printk("outw %#04x -> %#04x \n", val, addr);)
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return;
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}
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/****************************************************************************
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PARAMETERS:
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addr - PIO address to write
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val - Value to store
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REMARKS:
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Default PIO ;ong write function. Doesn't perform real outl.
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****************************************************************************/
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static void X86API p_outl(X86EMU_pioAddr addr, u32 val)
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{
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DB(if (DEBUG_IO_TRACE())
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printk("outl %#08x -> %#04x \n", val, addr);)
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return;
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}
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/*------------------------- Global Variables ------------------------------*/
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u8(X86APIP sys_rdb) (u32 addr) = rdb;
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u16(X86APIP sys_rdw) (u32 addr) = rdw;
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u32(X86APIP sys_rdl) (u32 addr) = rdl;
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void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb;
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void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw;
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void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl;
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u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb;
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u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw;
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u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl;
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void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb;
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void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw;
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void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl;
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/*----------------------------- Setup -------------------------------------*/
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/****************************************************************************
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PARAMETERS:
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funcs - New memory function pointers to make active
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REMARKS:
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This function is used to set the pointers to functions which access
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memory space, allowing the user application to override these functions
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and hook them out as necessary for their application.
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****************************************************************************/
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void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs)
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{
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sys_rdb = funcs->rdb;
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sys_rdw = funcs->rdw;
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sys_rdl = funcs->rdl;
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sys_wrb = funcs->wrb;
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sys_wrw = funcs->wrw;
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sys_wrl = funcs->wrl;
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}
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/****************************************************************************
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PARAMETERS:
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funcs - New programmed I/O function pointers to make active
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REMARKS:
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This function is used to set the pointers to functions which access
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I/O space, allowing the user application to override these functions
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and hook them out as necessary for their application.
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****************************************************************************/
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void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs)
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{
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sys_inb = funcs->inb;
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sys_inw = funcs->inw;
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sys_inl = funcs->inl;
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sys_outb = funcs->outb;
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sys_outw = funcs->outw;
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sys_outl = funcs->outl;
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}
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void X86EMU_setupIntrFunc(int intnum, X86EMU_intrFuncs func)
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{
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_X86EMU_intrTab[intnum] = func;
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}
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/****************************************************************************
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PARAMETERS:
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funcs - New interrupt vector table to make active
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REMARKS:
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This function is used to set the pointers to functions which handle
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interrupt processing in the emulator, allowing the user application to
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hook interrupts as necessary for their application. Any interrupts that
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are not hooked by the user application, and reflected and handled internally
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in the emulator via the interrupt vector table. This allows the application
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to get control when the code being emulated executes specific software
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interrupts.
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****************************************************************************/
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void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[])
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{
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int i;
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for (i = 0; i < 256; i++)
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_X86EMU_intrTab[i] = NULL;
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if (funcs) {
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for (i = 0; i < 256; i++)
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_X86EMU_intrTab[i] = funcs[i];
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}
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}
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/****************************************************************************
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PARAMETERS:
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int - New software interrupt to prepare for
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REMARKS:
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This function is used to set up the emulator state to exceute a software
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interrupt. This can be used by the user application code to allow an
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interrupt to be hooked, examined and then reflected back to the emulator
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so that the code in the emulator will continue processing the software
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interrupt as per normal. This essentially allows system code to actively
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hook and handle certain software interrupts as necessary.
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****************************************************************************/
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void X86EMU_prepareForInt(int num)
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{
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push_word((u16) M.x86.R_FLG);
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CLEAR_FLAG(F_IF);
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CLEAR_FLAG(F_TF);
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push_word(M.x86.R_CS);
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M.x86.R_CS = mem_access_word(num * 4 + 2);
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push_word(M.x86.R_IP);
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M.x86.R_IP = mem_access_word(num * 4);
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M.x86.intr = 0;
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}
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