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Diffstat (limited to 'src/devices/emulator/x86emu/sys.c')
| -rw-r--r-- | src/devices/emulator/x86emu/sys.c | 595 |
1 files changed, 595 insertions, 0 deletions
diff --git a/src/devices/emulator/x86emu/sys.c b/src/devices/emulator/x86emu/sys.c new file mode 100644 index 0000000000..2b437bff80 --- /dev/null +++ b/src/devices/emulator/x86emu/sys.c @@ -0,0 +1,595 @@ +/**************************************************************************** +* +* 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 overriden by the +* user library. +* +****************************************************************************/ +/* $XFree86: xc/extras/x86emu/src/x86emu/sys.c,v 1.5 2000/08/23 22:10:01 tsi Exp $ */ + +#include <x86emu/x86emu.h> +#include <x86emu/regs.h> +#include "debug.h" +#include "prim_ops.h" +#ifdef LINUXBIOS_VERSION +#include "arch/io.h" +#else +#include <sys/io.h> +#endif + +#ifdef IN_MODULE +#include "xf86_ansic.h" +#else +#include <string.h> +#endif +/*------------------------- Global Variables ------------------------------*/ + +X86EMU_sysEnv _X86EMU_env; /* Global emulator machine state */ +X86EMU_intrFuncs _X86EMU_intrTab[256]; + +/*----------------------------- Implementation ----------------------------*/ +#if defined(__alpha__) || defined(__alpha) +/* to cope with broken egcs-1.1.2 :-(((( */ + +/* + * inline functions to do unaligned accesses + * from linux/include/asm-alpha/unaligned.h + */ + +/* + * EGCS 1.1 knows about arbitrary unaligned loads. Define some + * packed structures to talk about such things with. + */ + +#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91 +struct __una_u64 { + unsigned long x __attribute__ ((packed)); +}; +struct __una_u32 { + unsigned int x __attribute__ ((packed)); +}; +struct __una_u16 { + unsigned short x __attribute__ ((packed)); +}; +#endif + +static __inline__ unsigned long ldq_u(unsigned long *r11) +{ +#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91 + const struct __una_u64 *ptr = (const struct __una_u64 *) r11; + return ptr->x; +#else + unsigned long r1, r2; + __asm__("ldq_u %0,%3\n\t" "ldq_u %1,%4\n\t" "extql %0,%2,%0\n\t" "extqh %1,%2,%1":"=&r"(r1), + "=&r" + (r2) + : "r"(r11), "m"(*r11), + "m"(*(const unsigned long *) (7 + (char *) r11))); + return r1 | r2; +#endif +} + +static __inline__ unsigned long ldl_u(unsigned int *r11) +{ +#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91 + const struct __una_u32 *ptr = (const struct __una_u32 *) r11; + return ptr->x; +#else + unsigned long r1, r2; + __asm__("ldq_u %0,%3\n\t" "ldq_u %1,%4\n\t" "extll %0,%2,%0\n\t" "extlh %1,%2,%1":"=&r"(r1), + "=&r" + (r2) + : "r"(r11), "m"(*r11), + "m"(*(const unsigned long *) (3 + (char *) r11))); + return r1 | r2; +#endif +} + +static __inline__ unsigned long ldw_u(unsigned short *r11) +{ +#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91 + const struct __una_u16 *ptr = (const struct __una_u16 *) r11; + return ptr->x; +#else + unsigned long r1, r2; + __asm__("ldq_u %0,%3\n\t" "ldq_u %1,%4\n\t" "extwl %0,%2,%0\n\t" "extwh %1,%2,%1":"=&r"(r1), + "=&r" + (r2) + : "r"(r11), "m"(*r11), + "m"(*(const unsigned long *) (1 + (char *) r11))); + return r1 | r2; +#endif +} + +/* + * Elemental unaligned stores + */ + +static __inline__ void stq_u(unsigned long r5, unsigned long *r11) +{ +#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91 + struct __una_u64 *ptr = (struct __una_u64 *) r11; + ptr->x = r5; +#else + unsigned long r1, r2, r3, r4; + + __asm__("ldq_u %3,%1\n\t" "ldq_u %2,%0\n\t" "insqh %6,%7,%5\n\t" "insql %6,%7,%4\n\t" "mskqh %3,%7,%3\n\t" "mskql %2,%7,%2\n\t" "bis %3,%5,%3\n\t" "bis %2,%4,%2\n\t" "stq_u %3,%1\n\t" "stq_u %2,%0":"=m"(*r11), + "=m"(*(unsigned long *) (7 + (char *) r11)), + "=&r"(r1), "=&r"(r2), "=&r"(r3), "=&r"(r4) + : "r"(r5), "r"(r11)); +#endif +} + +static __inline__ void stl_u(unsigned long r5, unsigned int *r11) +{ +#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91 + struct __una_u32 *ptr = (struct __una_u32 *) r11; + ptr->x = r5; +#else + unsigned long r1, r2, r3, r4; + + __asm__("ldq_u %3,%1\n\t" "ldq_u %2,%0\n\t" "inslh %6,%7,%5\n\t" "insll %6,%7,%4\n\t" "msklh %3,%7,%3\n\t" "mskll %2,%7,%2\n\t" "bis %3,%5,%3\n\t" "bis %2,%4,%2\n\t" "stq_u %3,%1\n\t" "stq_u %2,%0":"=m"(*r11), + "=m"(*(unsigned long *) (3 + (char *) r11)), + "=&r"(r1), "=&r"(r2), "=&r"(r3), "=&r"(r4) + : "r"(r5), "r"(r11)); +#endif +} + +static __inline__ void stw_u(unsigned long r5, unsigned short *r11) +{ +#if __GNUC__ > 2 || __GNUC_MINOR__ >= 91 + struct __una_u16 *ptr = (struct __una_u16 *) r11; + ptr->x = r5; +#else + unsigned long r1, r2, r3, r4; + + __asm__("ldq_u %3,%1\n\t" "ldq_u %2,%0\n\t" "inswh %6,%7,%5\n\t" "inswl %6,%7,%4\n\t" "mskwh %3,%7,%3\n\t" "mskwl %2,%7,%2\n\t" "bis %3,%5,%3\n\t" "bis %2,%4,%2\n\t" "stq_u %3,%1\n\t" "stq_u %2,%0":"=m"(*r11), + "=m"(*(unsigned long *) (1 + (char *) r11)), + "=&r"(r1), "=&r"(r2), "=&r"(r3), "=&r"(r4) + : "r"(r5), "r"(r11)); +#endif +} +#endif + +/* compute a pointer. This replaces code scattered all over the place! */ +u8 *mem_ptr(u32 addr, int size) +{ + u8 *retaddr = 0; + + if (addr > M.mem_size - size) { + DB(printk("mem_ptr: address %#lx out of range!\n", addr);) + HALT_SYS(); + } + /* a or b segment? */ + /* & with e to clear low-order bit, if it is a or b it will be a */ +#if 0 + if (((addr & 0xfffe0000) == 0xa0000) && M.abseg) { + //printk("It's a0000\n"); + //addr &= ~0xfffe0000; + retaddr = (u8 *) (M.mem_base + addr); + //printk("retaddr now 0x%p\n", retaddr); + } else +#endif + if (addr < 0x200) { + printk("%x:%x updating int vector 0x%x\n", + M.x86.R_CS, M.x86.R_IP, addr >> 2); + + retaddr = (u8 *) (M.mem_base + addr); + } else { + retaddr = (u8 *) (M.mem_base + addr); + } + + //printk_debug("%s, %x:%x ask address %x return address %x\n", + // __func__, M.x86.R_CS, M.x86.R_IP, addr, retaddr); + + 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()) + printk("%#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); + + if (addr > M.mem_size - 2) { + DB(printk("mem_read: address %#lx out of range!\n", (unsigned long) addr); + ) + HALT_SYS(); + } +#ifdef __BIG_ENDIAN__ + if (addr & 0x1) { + val = (*ptr | (*(ptr + 1) << 8)); + } else +#endif +#if defined(__alpha__) || defined(__alpha) + val = ldw_u((u16 *) (ptr)); +#else + val = *(u16 *) (ptr); +#endif + DB(if (DEBUG_MEM_TRACE()) + printk("%#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); + +#ifdef __BIG_ENDIAN__ + if (addr & 0x3) { + val = (*(u8 *) (ptr + 0) | + (*(u8 *) (ptr + 1) << 8) | + (*(u8 *) (ptr + 2) << 16) | (*(u8 *) (ptr + 3) << 24)); + } else +#endif +#if defined(__alpha__) || defined(__alpha) + val = ldl_u((u32 *) (ptr)); +#else + val = *(u32 *) (ptr); +#endif + DB(if (DEBUG_MEM_TRACE()) + printk("%#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); + DB(if (DEBUG_MEM_TRACE()) + printk("%#08x 1 <- %#x\n", addr, val);) + *(u8 *) (ptr) = 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); + DB(if (DEBUG_MEM_TRACE()) + printk("%#08x 2 <- %#x\n", addr, val);) +#ifdef __BIG_ENDIAN__ + if (addr & 0x1) { + *(u8 *) (ptr + 0) = (val >> 0) & 0xff; + *(u8 *) (ptr + 1) = (val >> 8) & 0xff; + } else +#endif +#if defined(__alpha__) || defined(__alpha) + stw_u(val, (u16 *) (ptr)); +#else + *(u16 *) (ptr) = val; +#endif +} + +/**************************************************************************** +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); + DB(if (DEBUG_MEM_TRACE()) + printk("%#08x 4 <- %#x\n", addr, val);) +#ifdef __BIG_ENDIAN__ + if (addr & 0x1) { + *(u8 *) (ptr + 0) = (val >> 0) & 0xff; + *(u8 *) (ptr + 1) = (val >> 8) & 0xff; + *(u8 *) (ptr + 2) = (val >> 16) & 0xff; + *(u8 *) (ptr + 3) = (val >> 24) & 0xff; + } else +#endif +#if defined(__alpha__) || defined(__alpha) + stl_u(val, (u32 *) (ptr)); +#else + *(u32 *) (ptr) = val; +#endif +} + +/**************************************************************************** +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()) + printk("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()) + printk("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()) + printk("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()) + printk("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()) + printk("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()) + printk("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 exceute 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 = (int) base; + M.mem_size = size; +} + +void X86EMU_setabseg(void *abseg) +{ + M.abseg = (unsigned long) abseg; +} |