first shot of legacybios emulation.

does not work yet.. sorry :-(


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1119 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

util/extensions/legacybios/kernel/x86glue.c

@@ -0,0 +1,137 @@
+#include <types.h>
+#include <io.h>
+#include <x86emu.h>
+#include <x86glue.h>
+
+void printk(const char *fmt, ...);
+void x86emu_dump_xregs(void);
+void pci_init(void);
+
+int int10_handler(void);
+int int1a_handler(void);
+
+void pushw(u16 val);
+unsigned char biosmem[1024 * 1024];
+int verbose = 0;
+
+u8 x_inb(u16 port)
+{
+	return inb(port);
+}
+
+u16 x_inw(u16 port)
+{
+	return inw(port);
+}
+
+u32 x_inl(u16 port)
+{
+	return inb(port);
+}
+
+void x_outb(u16 port, u8 val)
+{
+	outb(port, val);
+}
+
+void x_outw(u16 port, u16 val)
+{
+	outb(port, val);
+}
+
+void x_outl(u16 port, u32 val)
+{
+	outb(port, val);
+}
+
+X86EMU_pioFuncs myfuncs = {
+	x_inb, x_inw, x_inl,
+	x_outb, x_outw, x_outl
+};
+
+void irq_multiplexer(int num)
+{
+	int ret = 0;
+	switch (num) {
+	case 0x10:
+	case 0x42:
+	case 0x6d:
+		ret = int10_handler();
+		break;
+	case 0x1a:
+		ret = int1a_handler();
+		break;
+	default:
+		break;
+	}
+
+	if (!ret) {
+		printk("int%x not implemented\n", num);
+		x86emu_dump_xregs();
+	}
+}
+
+ptr current = 0;                                                                                                                   
+int startrom(unsigned char *addr)
+{
+	X86EMU_intrFuncs intFuncs[256];
+	void X86EMU_setMemBase(void *base, size_t size);
+	int trace = 1;
+	int i;
+	
+	int devfn=0x18; // FIXME
+	int size=64*1024; // FIXME
+	int initialcs=0xc000;
+	int initialip=0x0003; 
+	int base=0xc0000;
+
+	X86EMU_setMemBase(biosmem, sizeof(biosmem));
+	X86EMU_setupPioFuncs(&myfuncs);
+	pci_init();
+	for (i = 0; i < 256; i++)
+		intFuncs[i] = irq_multiplexer;
+	X86EMU_setupIntrFuncs(intFuncs);
+
+	
+	current->ax = devfn ? devfn : 0xff; // FIXME
+	/* above we need to search the device on the bus */
+	
+	current->dx = 0x80;
+	//      current->ip = 0;
+
+	for (i = 0; i < size; i++)
+		wrb(base + i, addr[i]);
+
+	/* cpu setup */
+	X86_AX = devfn ? devfn : 0xff;
+	X86_DX = 0x80;
+	X86_EIP = initialip;
+	X86_CS = initialcs;
+
+	/* Initialize stack and data segment */
+	X86_SS = 0x0030;
+	X86_DS = 0x0040;
+	X86_SP = 0xfffe;
+
+	/* We need a sane way to return from bios
+	 * execution. A hlt instruction and a pointer
+	 * to it, both kept on the stack, will do.
+	 */
+
+	pushw(0xf4f4);		/* hlt; hlt */
+	pushw(X86_SS);
+	pushw(X86_SP + 2);
+
+	X86_ES = 0x0000;
+
+	if (trace) {
+		printk("Switching to single step mode.\n");
+		X86EMU_trace_on();
+	}
+
+	X86EMU_exec();
+
+
+
+	return 0;
+}