| /**************************************************************************** |
| * |
| * Realmode X86 Emulator Library |
| * |
| * Copyright (C) 1996-1999 SciTech Software, Inc. |
| * Copyright (C) David Mosberger-Tang |
| * Copyright (C) 1999 Egbert Eich |
| * |
| * ======================================================================== |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and |
| * its documentation for any purpose is hereby granted without fee, |
| * provided that the above copyright notice appear in all copies and that |
| * both that copyright notice and this permission notice appear in |
| * supporting documentation, and that the name of the authors not be used |
| * in advertising or publicity pertaining to distribution of the software |
| * without specific, written prior permission. The authors makes no |
| * representations about the suitability of this software for any purpose. |
| * It is provided "as is" without express or implied warranty. |
| * |
| * THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF |
| * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
| * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| * |
| * ======================================================================== |
| * |
| * Language: ANSI C |
| * Environment: Any |
| * Developer: Kendall Bennett |
| * |
| * Description: This file includes subroutines which are related to |
| * programmed I/O and memory access. Included in this module |
| * are default functions with limited usefulness. For real |
| * uses these functions will most likely be overridden by the |
| * user library. |
| * |
| ****************************************************************************/ |
| |
| #include <arch/io.h> |
| #include <x86emu/x86emu.h> |
| #include <x86emu/regs.h> |
| #include <device/oprom/include/io.h> |
| #include "debug.h" |
| #include "prim_ops.h" |
| |
| #ifdef IN_MODULE |
| #include "xf86_ansic.h" |
| #else |
| #endif |
| /*------------------------- Global Variables ------------------------------*/ |
| |
| X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */ |
| X86EMU_intrFuncs _X86EMU_intrTab[256]; |
| |
| /*----------------------------- Implementation ----------------------------*/ |
| |
| /* compute a pointer. This replaces code scattered all over the place! */ |
| static u8 *mem_ptr(u32 addr, int size) |
| { |
| u8 *retaddr = 0; |
| |
| if (addr > M.mem_size - size) { |
| DB(printf("%s: address %#x out of range!\n", __func__, addr);) |
| HALT_SYS(); |
| } |
| if (addr < 0x200) { |
| //printf("%x:%x updating int vector 0x%x\n", |
| // M.x86.R_CS, M.x86.R_IP, addr >> 2); |
| } |
| retaddr = (u8 *) (M.mem_base + addr); |
| |
| return retaddr; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - Emulator memory address to read |
| |
| RETURNS: |
| Byte value read from emulator memory. |
| |
| REMARKS: |
| Reads a byte value from the emulator memory. |
| ****************************************************************************/ |
| u8 X86API rdb(u32 addr) |
| { |
| u8 val; |
| u8 *ptr; |
| |
| ptr = mem_ptr(addr, 1); |
| |
| val = *ptr; |
| DB(if (DEBUG_MEM_TRACE()) |
| printf("%#08x 1 -> %#x\n", addr, val);) |
| return val; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - Emulator memory address to read |
| |
| RETURNS: |
| Word value read from emulator memory. |
| |
| REMARKS: |
| Reads a word value from the emulator memory. |
| ****************************************************************************/ |
| u16 X86API rdw(u32 addr) |
| { |
| u16 val = 0; |
| u8 *ptr; |
| |
| ptr = mem_ptr(addr, 2); |
| val = *(u16 *) (ptr); |
| |
| DB(if (DEBUG_MEM_TRACE()) |
| printf("%#08x 2 -> %#x\n", addr, val);) |
| return val; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - Emulator memory address to read |
| |
| RETURNS: |
| Long value read from emulator memory. |
| REMARKS: |
| Reads a long value from the emulator memory. |
| ****************************************************************************/ |
| u32 X86API rdl(u32 addr) |
| { |
| u32 val = 0; |
| u8 *ptr; |
| |
| ptr = mem_ptr(addr, 4); |
| val = *(u32 *) (ptr); |
| |
| DB(if (DEBUG_MEM_TRACE()) |
| printf("%#08x 4 -> %#x\n", addr, val);) |
| return val; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - Emulator memory address to read |
| val - Value to store |
| |
| REMARKS: |
| Writes a byte value to emulator memory. |
| ****************************************************************************/ |
| void X86API wrb(u32 addr, u8 val) |
| { |
| u8 *ptr; |
| |
| ptr = mem_ptr(addr, 1); |
| *(u8 *) (ptr) = val; |
| |
| DB(if (DEBUG_MEM_TRACE()) |
| printf("%#08x 1 <- %#x\n", addr, val);) |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - Emulator memory address to read |
| val - Value to store |
| |
| REMARKS: |
| Writes a word value to emulator memory. |
| ****************************************************************************/ |
| void X86API wrw(u32 addr, u16 val) |
| { |
| u8 *ptr; |
| |
| ptr = mem_ptr(addr, 2); |
| *(u16 *) (ptr) = val; |
| |
| DB(if (DEBUG_MEM_TRACE()) |
| printf("%#08x 2 <- %#x\n", addr, val);) |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - Emulator memory address to read |
| val - Value to store |
| |
| REMARKS: |
| Writes a long value to emulator memory. |
| ****************************************************************************/ |
| void X86API wrl(u32 addr, u32 val) |
| { |
| u8 *ptr; |
| |
| ptr = mem_ptr(addr, 4); |
| *(u32 *) (ptr) = val; |
| |
| DB(if (DEBUG_MEM_TRACE()) |
| printf("%#08x 4 <- %#x\n", addr, val);) |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - PIO address to read |
| RETURN: |
| 0 |
| REMARKS: |
| Default PIO byte read function. Doesn't perform real inb. |
| ****************************************************************************/ |
| static u8 X86API p_inb(X86EMU_pioAddr addr) |
| { |
| DB(if (DEBUG_IO_TRACE()) |
| printf("inb %#04x\n", addr);) |
| return inb(addr); |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - PIO address to read |
| RETURN: |
| 0 |
| REMARKS: |
| Default PIO word read function. Doesn't perform real inw. |
| ****************************************************************************/ |
| static u16 X86API p_inw(X86EMU_pioAddr addr) |
| { |
| DB(if (DEBUG_IO_TRACE()) |
| printf("inw %#04x\n", addr);) |
| return inw(addr); |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - PIO address to read |
| RETURN: |
| 0 |
| REMARKS: |
| Default PIO long read function. Doesn't perform real inl. |
| ****************************************************************************/ |
| static u32 X86API p_inl(X86EMU_pioAddr addr) |
| { |
| DB(if (DEBUG_IO_TRACE()) |
| printf("inl %#04x\n", addr);) |
| return inl(addr); |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - PIO address to write |
| val - Value to store |
| REMARKS: |
| Default PIO byte write function. Doesn't perform real outb. |
| ****************************************************************************/ |
| static void X86API p_outb(X86EMU_pioAddr addr, u8 val) |
| { |
| DB(if (DEBUG_IO_TRACE()) |
| printf("outb %#02x -> %#04x\n", val, addr);) |
| outb(val, addr); |
| return; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - PIO address to write |
| val - Value to store |
| REMARKS: |
| Default PIO word write function. Doesn't perform real outw. |
| ****************************************************************************/ |
| static void X86API p_outw(X86EMU_pioAddr addr, u16 val) |
| { |
| DB(if (DEBUG_IO_TRACE()) |
| printf("outw %#04x -> %#04x\n", val, addr);) |
| outw(val, addr); |
| return; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| addr - PIO address to write |
| val - Value to store |
| REMARKS: |
| Default PIO ;ong write function. Doesn't perform real outl. |
| ****************************************************************************/ |
| static void X86API p_outl(X86EMU_pioAddr addr, u32 val) |
| { |
| DB(if (DEBUG_IO_TRACE()) |
| printf("outl %#08x -> %#04x\n", val, addr);) |
| |
| outl(val, addr); |
| return; |
| } |
| |
| /*------------------------- Global Variables ------------------------------*/ |
| |
| u8(X86APIP sys_rdb) (u32 addr) = rdb; |
| u16(X86APIP sys_rdw) (u32 addr) = rdw; |
| u32(X86APIP sys_rdl) (u32 addr) = rdl; |
| void (X86APIP sys_wrb) (u32 addr, u8 val) = wrb; |
| void (X86APIP sys_wrw) (u32 addr, u16 val) = wrw; |
| void (X86APIP sys_wrl) (u32 addr, u32 val) = wrl; |
| u8(X86APIP sys_inb) (X86EMU_pioAddr addr) = p_inb; |
| u16(X86APIP sys_inw) (X86EMU_pioAddr addr) = p_inw; |
| u32(X86APIP sys_inl) (X86EMU_pioAddr addr) = p_inl; |
| void (X86APIP sys_outb) (X86EMU_pioAddr addr, u8 val) = p_outb; |
| void (X86APIP sys_outw) (X86EMU_pioAddr addr, u16 val) = p_outw; |
| void (X86APIP sys_outl) (X86EMU_pioAddr addr, u32 val) = p_outl; |
| |
| /*----------------------------- Setup -------------------------------------*/ |
| |
| /**************************************************************************** |
| PARAMETERS: |
| funcs - New memory function pointers to make active |
| |
| REMARKS: |
| This function is used to set the pointers to functions which access |
| memory space, allowing the user application to override these functions |
| and hook them out as necessary for their application. |
| ****************************************************************************/ |
| void X86EMU_setupMemFuncs(X86EMU_memFuncs * funcs) |
| { |
| sys_rdb = funcs->rdb; |
| sys_rdw = funcs->rdw; |
| sys_rdl = funcs->rdl; |
| sys_wrb = funcs->wrb; |
| sys_wrw = funcs->wrw; |
| sys_wrl = funcs->wrl; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| funcs - New programmed I/O function pointers to make active |
| |
| REMARKS: |
| This function is used to set the pointers to functions which access |
| I/O space, allowing the user application to override these functions |
| and hook them out as necessary for their application. |
| ****************************************************************************/ |
| void X86EMU_setupPioFuncs(X86EMU_pioFuncs * funcs) |
| { |
| sys_inb = funcs->inb; |
| sys_inw = funcs->inw; |
| sys_inl = funcs->inl; |
| sys_outb = funcs->outb; |
| sys_outw = funcs->outw; |
| sys_outl = funcs->outl; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| funcs - New interrupt vector table to make active |
| |
| REMARKS: |
| This function is used to set the pointers to functions which handle |
| interrupt processing in the emulator, allowing the user application to |
| hook interrupts as necessary for their application. Any interrupts that |
| are not hooked by the user application, and reflected and handled internally |
| in the emulator via the interrupt vector table. This allows the application |
| to get control when the code being emulated executes specific software |
| interrupts. |
| ****************************************************************************/ |
| void X86EMU_setupIntrFuncs(X86EMU_intrFuncs funcs[]) |
| { |
| int i; |
| |
| for (i = 0; i < 256; i++) |
| _X86EMU_intrTab[i] = NULL; |
| if (funcs) { |
| for (i = 0; i < 256; i++) |
| _X86EMU_intrTab[i] = funcs[i]; |
| } |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| int - New software interrupt to prepare for |
| |
| REMARKS: |
| This function is used to set up the emulator state to execute a software |
| interrupt. This can be used by the user application code to allow an |
| interrupt to be hooked, examined and then reflected back to the emulator |
| so that the code in the emulator will continue processing the software |
| interrupt as per normal. This essentially allows system code to actively |
| hook and handle certain software interrupts as necessary. |
| ****************************************************************************/ |
| void X86EMU_prepareForInt(int num) |
| { |
| push_word((u16) M.x86.R_FLG); |
| CLEAR_FLAG(F_IF); |
| CLEAR_FLAG(F_TF); |
| push_word(M.x86.R_CS); |
| M.x86.R_CS = mem_access_word(num * 4 + 2); |
| push_word(M.x86.R_IP); |
| M.x86.R_IP = mem_access_word(num * 4); |
| M.x86.intr = 0; |
| } |
| |
| void X86EMU_setMemBase(void *base, size_t size) |
| { |
| M.mem_base = (unsigned long) base; |
| M.mem_size = size; |
| } |