void x86_exception(struct eregs *info);
+/* From x86_asm.S */
extern unsigned char __idt_handler, __idt_handler_size;
extern unsigned char __realmode_code, __realmode_code_size;
-extern unsigned char __run_optionrom, __run_interrupt;
+extern unsigned char __realmode_call, __realmode_interrupt;
-void (*run_optionrom)(u32 devfn) __attribute__((regparm(0))) = (void *)&__run_optionrom;
-void (*vga_enable_console)(void) __attribute__((regparm(0))) = (void *)&__run_interrupt;
+void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
+ u32 esi, u32 edi) __attribute__((regparm(0))) = (void *)&__realmode_call;
+
+void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx, u32 edx,
+ u32 esi, u32 edi) __attribute__((regparm(0))) = (void *)&__realmode_interrupt;
+
+#define FAKE_MEMORY_SIZE (1024*1024) // only 1MB
+#define INITIAL_EBDA_SEGMENT 0xF600
+#define INITIAL_EBDA_SIZE 0x400
+
+static void setup_bda(void)
+{
+ /* clear BIOS DATA AREA */
+ memset((void *)0x400, 0, 0x200);
+
+ write16(0x413, FAKE_MEMORY_SIZE / 1024);
+ write16(0x40e, INITIAL_EBDA_SEGMENT);
+
+ /* Set up EBDA */
+ memset((void *)(INITIAL_EBDA_SEGMENT << 4), 0, INITIAL_EBDA_SIZE);
+ write16((INITIAL_EBDA_SEGMENT << 4) + 0x0, INITIAL_EBDA_SIZE / 1024);
+}
+
+static void setup_rombios(void)
+{
+ const char date[] = "06/11/99";
+ memcpy((void *)0xffff5, &date, 8);
+
+ const char ident[] = "PCI_ISA";
+ memcpy((void *)0xfffd9, &ident, 7);
+
+ /* system model: IBM-AT */
+ write8(0xffffe, 0xfc);
+}
int (*intXX_handler[256])(struct eregs *regs) = { NULL };
static int intXX_exception_handler(struct eregs *regs)
{
- printk(BIOS_INFO, "Oops, exception %d while executing option rom\n",
+ printk(BIOS_INFO, "Oops, exception %d while executing option rom\n",
regs->vector);
- x86_exception(regs); // Call coreboot exception handler
+#if 0
+ // Odd: The i945GM VGA oprom chokes on a pushl %eax and will
+ // die with an exception #6 if we run the coreboot exception
+ // handler. Just continue, as it executes fine.
+ x86_exception(regs); // Call coreboot exception handler
+#endif
return 0; // Never returns?
}
static int intXX_unknown_handler(struct eregs *regs)
{
- printk(BIOS_INFO, "Unsupported software interrupt #0x%x\n",
- regs->vector);
+ printk(BIOS_INFO, "Unsupported software interrupt #0x%x eax 0x%x\n",
+ regs->vector, regs->eax);
return -1;
}
intXX_handler[intXX] = intXX_func;
}
+static int int10_handler(struct eregs *regs)
+{
+ int res=-1;
+ static u8 cursor_row=0, cursor_col=0;
+ switch((regs->eax & 0xff00)>>8) {
+ case 0x01: // Set cursor shape
+ res = 0;
+ break;
+ case 0x02: // Set cursor position
+ if (cursor_row != ((regs->edx >> 8) & 0xff) ||
+ cursor_col >= (regs->edx & 0xff)) {
+ printk(BIOS_INFO, "\n");
+ }
+ cursor_row = (regs->edx >> 8) & 0xff;
+ cursor_col = regs->edx & 0xff;
+ res = 0;
+ break;
+ case 0x03: // Get cursor position
+ regs->eax &= 0x00ff;
+ regs->ecx = 0x0607;
+ regs->edx = (cursor_row << 8) | cursor_col;
+ res = 0;
+ break;
+ case 0x06: // Scroll up
+ printk(BIOS_INFO, "\n");
+ res = 0;
+ break;
+ case 0x08: // Get Character and Mode at Cursor Position
+ regs->eax = 0x0f00 | 'A'; // White on black 'A'
+ res = 0;
+ break;
+ case 0x09: // Write Character and attribute
+ case 0x10: // Write Character
+ printk(BIOS_INFO, "%c", regs->eax & 0xff);
+ res = 0;
+ break;
+ case 0x0f: // Get video mode
+ regs->eax = 0x5002; //80x25
+ regs->ebx &= 0x00ff;
+ res = 0;
+ break;
+ default:
+ printk(BIOS_WARNING, "Unknown INT10 function %04x!\n",
+ regs->eax & 0xffff);
+ break;
+ }
+ return res;
+}
+
+static int int16_handler(struct eregs *regs)
+{
+ int res=-1;
+ switch((regs->eax & 0xff00)>>8) {
+ case 0x00: // Check for Keystroke
+ regs->eax = 0x6120; // Space Bar, Space
+ res = 0;
+ break;
+ case 0x01: // Check for Keystroke
+ regs->eflags |= 1<<6; // Zero Flag set (no key available)
+ res = 0;
+ break;
+ default:
+ printk(BIOS_WARNING, "Unknown INT16 function %04x!\n",
+ regs->eax & 0xffff);
+ break;
+ }
+ return res;
+}
+
int int12_handler(struct eregs *regs);
int int15_handler(struct eregs *regs);
int int1a_handler(struct eregs *regs);
{
int i;
- /* The first 16 intXX functions are not BIOS services,
+ /* The first 16 intXX functions are not BIOS services,
* but the CPU-generated exceptions ("hardware interrupts")
*/
for (i = 0; i < 0x10; i++)
intXX_handler[i] = &intXX_exception_handler;
-
+
/* Mark all other intXX calls as unknown first */
for (i = 0x10; i < 0x100; i++)
{
* interrupt handlers, such as the int15
*/
switch (i) {
+ case 0x10:
+ intXX_handler[0x10] = &int10_handler;
+ break;
case 0x12:
intXX_handler[0x12] = &int12_handler;
break;
case 0x15:
intXX_handler[0x15] = &int15_handler;
break;
+ case 0x16:
+ intXX_handler[0x16] = &int16_handler;
+ break;
case 0x1a:
intXX_handler[0x1a] = &int1a_handler;
break;
}
/* Many option ROMs use the hard coded interrupt entry points in the
- * system bios. So install them at the known locations.
- * Only need int10 so far.
+ * system bios. So install them at the known locations.
*/
-
+
/* int42 is the relocated int10 */
- write_idt_stub((void *)0xff065, 0x42);
+ write_idt_stub((void *)0xff065, 0x42);
+ /* BIOS Int 11 Handler F000:F84D */
+ write_idt_stub((void *)0xff84d, 0x11);
+ /* BIOS Int 12 Handler F000:F841 */
+ write_idt_stub((void *)0xff841, 0x12);
+ /* BIOS Int 13 Handler F000:EC59 */
+ write_idt_stub((void *)0xfec59, 0x13);
+ /* BIOS Int 14 Handler F000:E739 */
+ write_idt_stub((void *)0xfe739, 0x14);
+ /* BIOS Int 15 Handler F000:F859 */
+ write_idt_stub((void *)0xff859, 0x15);
+ /* BIOS Int 16 Handler F000:E82E */
+ write_idt_stub((void *)0xfe82e, 0x16);
+ /* BIOS Int 17 Handler F000:EFD2 */
+ write_idt_stub((void *)0xfefd2, 0x17);
+ /* ROM BIOS Int 1A Handler F000:FE6E */
+ write_idt_stub((void *)0xffe6e, 0x1a);
}
void run_bios(struct device *dev, unsigned long addr)
{
- /* clear vga bios data area */
- memset((void *)0x400, 0, 0x200);
+ u32 num_dev = (dev->bus->secondary << 8) | dev->path.pci.devfn;
+
+ /* Set up BIOS Data Area */
+ setup_bda();
+
+ /* Set up some legacy information in the F segment */
+ setup_rombios();
/* Set up C interrupt handlers */
setup_interrupt_handlers();
- /* Setting up realmode IDT */
+ /* Set up real-mode IDT */
setup_realmode_idt();
memcpy(REALMODE_BASE, &__realmode_code, (size_t)&__realmode_code_size);
(u32)&__realmode_code_size);
printk(BIOS_DEBUG, "Calling Option ROM...\n");
- run_optionrom((dev->bus->secondary << 8) | dev->path.pci.devfn);
+ /* TODO ES:DI Pointer to System BIOS PnP Installation Check Structure */
+ /* Option ROM entry point is at OPROM start + 3 */
+ realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0, 0x0);
printk(BIOS_DEBUG, "... Option ROM returned.\n");
}
-#if defined(CONFIG_GEODE_VSA) && CONFIG_GEODE_VSA
+#if CONFIG_GEODE_VSA
#include <cpu/amd/lxdef.h>
#include <cpu/amd/vr.h>
#include <cbfs.h>
-extern unsigned char __run_vsa;
-void (*run_vsa)(u32 smm, u32 sysmem) __attribute__((regparm(0))) = (void *)&__run_vsa;
-
#define VSA2_BUFFER 0x60000
#define VSA2_ENTRY_POINT 0x60020
"outl %%eax, %%dx\n"
"addb $2, %%dl\n"
"inw %%dx, %%ax\n"
- : "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
+ : "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
: "a"(classIndex)
);
{
printk(BIOS_DEBUG, "Preparing for VSA...\n");
- /* clear bios data area */
- memset((void *)0x400, 0, 0x200);
-
/* Set up C interrupt handlers */
setup_interrupt_handlers();
}
printk(BIOS_DEBUG, "Calling VSA module...\n");
+
/* ECX gets SMM, EDX gets SYSMEM */
- run_vsa(MSR_GLIU0_SMM, MSR_GLIU0_SYSMEM);
+ realmode_call(VSA2_ENTRY_POINT, 0x0, 0x0, MSR_GLIU0_SMM,
+ MSR_GLIU0_SYSMEM, 0x0, 0x0);
+
printk(BIOS_DEBUG, "... VSA module returned.\n");
/* Restart timer 1 */
}
#endif
-/* interrupt_handler() is called from assembler code only,
+/* interrupt_handler() is called from assembler code only,
* so there is no use in putting the prototype into a header file.
*/
int __attribute__((regparm(0))) interrupt_handler(u32 intnumber,
cs = cs_ip >> 16;
flags = stackflags;
+#if CONFIG_REALMODE_DEBUG
printk(BIOS_DEBUG, "oprom: INT# 0x%x\n", intnumber);
printk(BIOS_DEBUG, "oprom: eax: %08x ebx: %08x ecx: %08x edx: %08x\n",
eax, ebx, ecx, edx);
ebp, esp, edi, esi);
printk(BIOS_DEBUG, "oprom: ip: %04x cs: %04x flags: %08x\n",
ip, cs, flags);
+#endif
// Fetch arguments from the stack and put them into
// a structure that we want to pass on to our sub interrupt
// will later pop them.
// What happens here is that we force (volatile!) changing
// the values of the parameters of this function. We do this
- // because we know that they stay alive on the stack after
+ // because we know that they stay alive on the stack after
// we leave this function. Don't say this is bollocks.
*(volatile u32 *)&eax = reg_info.eax;
*(volatile u32 *)&ecx = reg_info.ecx;
projects / coreboot.git / blobdiff