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authorGwenolé Beauchesne <gbeauchesne@mandriva.org>2004-08-25 05:45:29 +0000
committerGwenolé Beauchesne <gbeauchesne@mandriva.org>2004-08-25 05:45:29 +0000
commite0fbcfe868b509f256fcdc239178d32f617bb129 (patch)
tree26d7a7632d92979a6f7a39f0a707c935ca186e9f /tools/ddcprobe/int10/emu_vm86.c
parent56e607a5ce0c98074b0c3067e2bba76e9d73223d (diff)
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VGA softbootloader for Linux, uses an x86 CPU emulator on non x86 arches.
Diffstat (limited to 'tools/ddcprobe/int10/emu_vm86.c')
-rw-r--r--tools/ddcprobe/int10/emu_vm86.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/tools/ddcprobe/int10/emu_vm86.c b/tools/ddcprobe/int10/emu_vm86.c
new file mode 100644
index 000000000..2603a5aeb
--- /dev/null
+++ b/tools/ddcprobe/int10/emu_vm86.c
@@ -0,0 +1,154 @@
+#include <stdio.h>
+#include <stdarg.h>
+#ifdef __i386__
+#include <sys/vm86.h>
+#else
+#include "vm86_struct.h"
+#endif
+
+#define INT2PTR(a) ((a) + (unsigned char *) 0)
+
+#include "../x86emu/include/x86emu.h"
+#include "AsmMacros.h"
+
+int emu_vm86_ret;
+
+static u8 Mem_rb(u32 addr) {
+ return *(u8 *)(INT2PTR(addr));
+}
+static void Mem_wb(u32 addr, u8 val) {
+ *(u8 *)INT2PTR(addr) = val;
+}
+#ifdef __ia64__
+
+static u16 Mem_rw(u32 addr) {
+ return *(u8 *)INT2PTR(addr) | *(u8 *)INT2PTR(addr + 1) << 8;
+}
+static u32 Mem_rl(u32 addr) {
+ return *(u8 *)INT2PTR(addr) | *(u8 *)INT2PTR(addr + 1) << 8 |
+ *(u8 *)INT2PTR(addr + 2) << 16 | *(u8 *)INT2PTR(addr + 3) << 24;
+}
+static void Mem_ww(u32 addr, u16 val) {
+ *(u8 *)INT2PTR(addr) = val;
+ *(u8 *)INT2PTR(addr + 1) = val >> 8;
+}
+static void Mem_wl(u32 addr, u32 val) {
+ *(u8 *)INT2PTR(addr) = val;
+ *(u8 *)INT2PTR(addr + 1) = val >> 8;
+ *(u8 *)INT2PTR(addr + 2) = val >> 16;
+ *(u8 *)INT2PTR(addr + 3) = val >> 24;
+}
+
+#else
+
+static u16 Mem_rw(u32 addr) {
+ return *(u16 *)INT2PTR(addr);
+}
+static u32 Mem_rl(u32 addr) {
+ return *(u32 *)INT2PTR(addr);
+}
+static void Mem_ww(u32 addr, u16 val) {
+ *(u16 *)INT2PTR(addr) = val;
+}
+static void Mem_wl(u32 addr, u32 val) {
+ *(u32 *)INT2PTR(addr) = val;
+}
+
+#endif
+
+static void do_int(int num) {
+ emu_vm86_ret = VM86_INTx | (num << 8);
+ M.x86.intr = INTR_HALTED;
+}
+
+
+int
+emu_vm86(struct vm86_struct *vm)
+{
+ int i;
+
+ X86EMU_memFuncs memFuncs;
+ X86EMU_intrFuncs intFuncs[256];
+ X86EMU_pioFuncs pioFuncs;
+
+ memFuncs.rdb = Mem_rb;
+ memFuncs.rdw = Mem_rw;
+ memFuncs.rdl = Mem_rl;
+ memFuncs.wrb = Mem_wb;
+ memFuncs.wrw = Mem_ww;
+ memFuncs.wrl = Mem_wl;
+ X86EMU_setupMemFuncs(&memFuncs);
+
+ pioFuncs.inb = (u8(*)(u16))inb;
+ pioFuncs.inw = (u16(*)(u16))inw;
+ pioFuncs.inl = (u32(*)(u16))inl;
+ pioFuncs.outb = (void(*)(u16, u8))outb;
+ pioFuncs.outw = (void(*)(u16, u16))outw;
+ pioFuncs.outl = (void(*)(u16, u32))outl;
+ X86EMU_setupPioFuncs(&pioFuncs);
+
+ for (i=0;i<256;i++)
+ intFuncs[i] = do_int;
+ X86EMU_setupIntrFuncs(intFuncs);
+
+ M.mem_base = 0;
+ M.mem_size = 1024*1024 + 1024;
+
+ M.x86.R_EAX = vm->regs.eax;
+ M.x86.R_EBX = vm->regs.ebx;
+ M.x86.R_ECX = vm->regs.ecx;
+ M.x86.R_EDX = vm->regs.edx;
+
+ M.x86.R_ESP = vm->regs.esp;
+ M.x86.R_EBP = vm->regs.ebp;
+ M.x86.R_ESI = vm->regs.esi;
+ M.x86.R_EDI = vm->regs.edi;
+ M.x86.R_EIP = vm->regs.eip;
+ M.x86.R_EFLG = vm->regs.eflags;
+
+ M.x86.R_CS = vm->regs.cs;
+ M.x86.R_DS = vm->regs.ds;
+ M.x86.R_SS = vm->regs.ss;
+ M.x86.R_ES = vm->regs.es;
+ M.x86.R_FS = vm->regs.fs;
+ M.x86.R_GS = vm->regs.gs;
+
+ emu_vm86_ret = 0;
+ X86EMU_exec();
+
+ vm->regs.eax = M.x86.R_EAX;
+ vm->regs.ebx = M.x86.R_EBX;
+ vm->regs.ecx = M.x86.R_ECX;
+ vm->regs.edx = M.x86.R_EDX;
+
+ vm->regs.esp = M.x86.R_ESP;
+ vm->regs.ebp = M.x86.R_EBP;
+ vm->regs.esi = M.x86.R_ESI;
+ vm->regs.edi = M.x86.R_EDI;
+ vm->regs.eip = M.x86.R_EIP;
+ vm->regs.eflags = M.x86.R_EFLG;
+
+ vm->regs.cs = M.x86.R_CS;
+ vm->regs.ds = M.x86.R_DS;
+ vm->regs.ss = M.x86.R_SS;
+ vm->regs.es = M.x86.R_ES;
+ vm->regs.fs = M.x86.R_FS;
+ vm->regs.gs = M.x86.R_GS;
+
+ if (emu_vm86_ret == 0 && *(unsigned char *)INT2PTR(((u32)M.x86.R_CS << 4) + (M.x86.R_IP - 1)) == 0xf4)
+ {
+ vm->regs.eip--;
+ return VM86_UNKNOWN;
+ }
+ return emu_vm86_ret ? emu_vm86_ret : -1;
+}
+
+void
+printk(const char *fmt, ...)
+{
+ va_list argptr;
+ va_start(argptr, fmt);
+ vfprintf(stderr, fmt, argptr);
+ va_end(argptr);
+}
+