409 lines
12 KiB
C
409 lines
12 KiB
C
/****************************************************************************
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*
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* BIOS emulator and interface
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* to Realmode X86 Emulator Library
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*
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* Copyright (C) 1996-1999 SciTech Software, Inc.
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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 BIOS emulator I/O and memory access
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* functions.
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*
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****************************************************************************/
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#include "biosemui.h"
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/*------------------------------- Macros ----------------------------------*/
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/* Macros to read and write values to x86 bus memory. Replace these as
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* necessary if you need to do something special to access memory over
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* the bus on a particular processor family.
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*/
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#define readb(base,off) *((u8*)((u32)(base) + (off)))
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#define readw(base,off) *((u16*)((u32)(base) + (off)))
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#define readl(base,off) *((u32*)((u32)(base) + (off)))
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#define writeb(v,base,off) *((u8*)((u32)(base) + (off))) = (v)
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#define writew(v,base,off) *((u16*)((u32)(base) + (off))) = (v)
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#define writel(v,base,off) *((u32*)((u32)(base) + (off))) = (v)
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/*----------------------------- Implementation ----------------------------*/
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#ifdef DEBUG
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# define DEBUG_MEM() (M.x86.debug & DEBUG_MEM_TRACE_F)
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#else
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# define DEBUG_MEM()
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#endif
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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. We have three distinct memory
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regions that are handled differently, which this function handles.
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****************************************************************************/
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u8 X86API BE_rdb(
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u32 addr)
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{
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u8 val = 0;
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if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
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val = *(u8*)(_BE_env.biosmem_base + addr - 0xC0000);
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}
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else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
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val = readb(_BE_env.busmem_base, addr - 0xA0000);
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}
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else if (addr > M.mem_size - 1) {
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DB( printk("mem_read: address %#lx out of range!\n", addr);)
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HALT_SYS();
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}
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else {
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val = *(u8*)(M.mem_base + addr);
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}
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DB( if (DEBUG_MEM())
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printk("%#08x 1 -> %#x\n", addr, val);)
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return val;
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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. We have three distinct memory
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regions that are handled differently, which this function handles.
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****************************************************************************/
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u16 X86API BE_rdw(
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u32 addr)
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{
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u16 val = 0;
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if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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addr -= 0xC0000;
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val = ( *(u8*)(_BE_env.biosmem_base + addr) |
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(*(u8*)(_BE_env.biosmem_base + addr + 1) << 8));
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}
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else
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#endif
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val = *(u16*)(_BE_env.biosmem_base + addr - 0xC0000);
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}
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else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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addr -= 0xA0000;
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val = ( readb(_BE_env.busmem_base, addr) |
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(readb(_BE_env.busmem_base, addr + 1) << 8));
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}
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else
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#endif
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val = readw(_BE_env.busmem_base, addr - 0xA0000);
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}
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else if (addr > M.mem_size - 2) {
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DB( printk("mem_read: address %#lx out of range!\n", addr);)
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HALT_SYS();
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}
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else {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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val = ( *(u8*)(M.mem_base + addr) |
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(*(u8*)(M.mem_base + addr + 1) << 8));
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}
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else
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#endif
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val = *(u16*)(M.mem_base + addr);
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}
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DB( if (DEBUG_MEM())
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printk("%#08x 2 -> %#x\n", addr, val);)
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return val;
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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. We have three distinct memory
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regions that are handled differently, which this function handles.
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****************************************************************************/
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u32 X86API BE_rdl(
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u32 addr)
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{
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u32 val = 0;
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if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x3) {
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addr -= 0xC0000;
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val = ( *(u8*)(_BE_env.biosmem_base + addr + 0) |
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(*(u8*)(_BE_env.biosmem_base + addr + 1) << 8) |
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(*(u8*)(_BE_env.biosmem_base + addr + 2) << 16) |
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(*(u8*)(_BE_env.biosmem_base + addr + 3) << 24));
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}
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else
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#endif
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val = *(u32*)(_BE_env.biosmem_base + addr - 0xC0000);
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}
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else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x3) {
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addr -= 0xA0000;
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val = ( readb(_BE_env.busmem_base, addr) |
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(readb(_BE_env.busmem_base, addr + 1) << 8) |
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(readb(_BE_env.busmem_base, addr + 2) << 16) |
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(readb(_BE_env.busmem_base, addr + 3) << 24));
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}
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else
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#endif
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val = readl(_BE_env.busmem_base, addr - 0xA0000);
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}
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else if (addr > M.mem_size - 4) {
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DB( printk("mem_read: address %#lx out of range!\n", addr);)
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HALT_SYS();
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}
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else {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x3) {
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val = ( *(u8*)(M.mem_base + addr + 0) |
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(*(u8*)(M.mem_base + addr + 1) << 8) |
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(*(u8*)(M.mem_base + addr + 2) << 16) |
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(*(u8*)(M.mem_base + addr + 3) << 24));
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}
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else
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#endif
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val = *(u32*)(M.mem_base + addr);
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}
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DB( if (DEBUG_MEM())
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printk("%#08x 4 -> %#x\n", addr, val);)
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return val;
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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. We have three distinct memory
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regions that are handled differently, which this function handles.
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****************************************************************************/
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void X86API BE_wrb(
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u32 addr,
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u8 val)
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{
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DB( if (DEBUG_MEM())
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printk("%#08x 1 <- %#x\n", addr, val);)
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if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
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*(u8*)(_BE_env.biosmem_base + addr - 0xC0000) = val;
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}
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else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
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writeb(val, _BE_env.busmem_base, addr - 0xA0000);
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}
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else if (addr > M.mem_size-1) {
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DB( printk("mem_write: address %#lx out of range!\n", addr);)
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HALT_SYS();
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}
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else {
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*(u8*)(M.mem_base + addr) = 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. We have three distinct memory
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regions that are handled differently, which this function handles.
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****************************************************************************/
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void X86API BE_wrw(
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u32 addr,
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u16 val)
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{
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DB( if (DEBUG_MEM())
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printk("%#08x 2 <- %#x\n", addr, val);)
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if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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addr -= 0xC0000;
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*(u8*)(_BE_env.biosmem_base + addr + 0) = (val >> 0) & 0xff;
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*(u8*)(_BE_env.biosmem_base + addr + 1) = (val >> 8) & 0xff;
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}
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else
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#endif
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*(u16*)(_BE_env.biosmem_base + addr - 0xC0000) = val;
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}
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else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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addr -= 0xA0000;
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writeb(val >> 0, _BE_env.busmem_base, addr);
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writeb(val >> 8, _BE_env.busmem_base, addr + 1);
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}
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else
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#endif
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writew(val, _BE_env.busmem_base, addr - 0xA0000);
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}
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else if (addr > M.mem_size-2) {
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DB( printk("mem_write: address %#lx out of range!\n", addr);)
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HALT_SYS();
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}
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else {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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*(u8*)(M.mem_base + addr + 0) = (val >> 0) & 0xff;
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*(u8*)(M.mem_base + addr + 1) = (val >> 8) & 0xff;
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}
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else
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#endif
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*(u16*)(M.mem_base + addr) = 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. We have three distinct memory
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regions that are handled differently, which this function handles.
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****************************************************************************/
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void X86API BE_wrl(
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u32 addr,
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u32 val)
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{
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DB( if (DEBUG_MEM())
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printk("%#08x 4 <- %#x\n", addr, val);)
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if (addr >= 0xC0000 && addr <= _BE_env.biosmem_limit) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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addr -= 0xC0000;
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*(u8*)(M.mem_base + addr + 0) = (val >> 0) & 0xff;
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*(u8*)(M.mem_base + addr + 1) = (val >> 8) & 0xff;
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*(u8*)(M.mem_base + addr + 2) = (val >> 16) & 0xff;
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*(u8*)(M.mem_base + addr + 3) = (val >> 24) & 0xff;
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}
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else
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#endif
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*(u32*)(M.mem_base + addr - 0xC0000) = val;
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}
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else if (addr >= 0xA0000 && addr <= 0xFFFFF) {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x3) {
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addr -= 0xA0000;
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writeb(val >> 0, _BE_env.busmem_base, addr);
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writeb(val >> 8, _BE_env.busmem_base, addr + 1);
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writeb(val >> 16, _BE_env.busmem_base, addr + 1);
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writeb(val >> 24, _BE_env.busmem_base, addr + 1);
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}
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else
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#endif
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writel(val, _BE_env.busmem_base, addr - 0xA0000);
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}
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else if (addr > M.mem_size-4) {
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DB( printk("mem_write: address %#lx out of range!\n", addr);)
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HALT_SYS();
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}
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else {
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#ifdef __BIG_ENDIAN__
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if (addr & 0x1) {
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*(u8*)(M.mem_base + addr + 0) = (val >> 0) & 0xff;
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*(u8*)(M.mem_base + addr + 1) = (val >> 8) & 0xff;
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*(u8*)(M.mem_base + addr + 2) = (val >> 16) & 0xff;
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*(u8*)(M.mem_base + addr + 3) = (val >> 24) & 0xff;
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}
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else
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#endif
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*(u32*)(M.mem_base + addr) = val;
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}
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}
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/* Debug functions to do ISA/PCI bus port I/O */
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#ifdef DEBUG
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#define DEBUG_IO() (M.x86.debug & DEBUG_IO_TRACE_F)
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u8 X86API BE_inb(int port)
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{
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u8 val = PM_inpb(port);
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if (DEBUG_IO())
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printk("%04X:%04X: inb.%04X -> %02X\n",M.x86.saved_cs, M.x86.saved_ip, (ushort)port, val);
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return val;
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}
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u16 X86API BE_inw(int port)
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{
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u16 val = PM_inpw(port);
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if (DEBUG_IO())
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printk("%04X:%04X: inw.%04X -> %04X\n",M.x86.saved_cs, M.x86.saved_ip, (ushort)port, val);
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return val;
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}
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u32 X86API BE_inl(int port)
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{
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u32 val = PM_inpd(port);
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if (DEBUG_IO())
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printk("%04X:%04X: inl.%04X -> %08X\n",M.x86.saved_cs, M.x86.saved_ip, (ushort)port, val);
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return val;
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}
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void X86API BE_outb(int port, u8 val)
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{
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if (DEBUG_IO())
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printk("%04X:%04X: outb.%04X <- %02X\n",M.x86.saved_cs, M.x86.saved_ip, (ushort)port, val);
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PM_outpb(port,val);
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}
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void X86API BE_outw(int port, u16 val)
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{
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if (DEBUG_IO())
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printk("%04X:%04X: outw.%04X <- %04X\n",M.x86.saved_cs, M.x86.saved_ip, (ushort)port, val);
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PM_outpw(port,val);
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}
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void X86API BE_outl(int port, u32 val)
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{
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if (DEBUG_IO())
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printk("%04X:%04X: outl.%04X <- %08X\n",M.x86.saved_cs, M.x86.saved_ip, (ushort)port, val);
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PM_outpd(port,val);
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}
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#endif
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