2 * This file is part of the coreboot project.
4 * Copyright (C) 2007 Advanced Micro Devices, Inc.
5 * Copyright (C) 2009-2010 coresystems GmbH
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; version 2 of the License.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
21 #include <device/pci.h>
25 #include <arch/registers.h>
26 #include <console/console.h>
27 #include <arch/interrupt.h>
31 void (*realmode_call)(u32 addr, u32 eax, u32 ebx, u32 ecx, u32 edx,
32 u32 esi, u32 edi) __attribute__((regparm(0))) = (void *)&__realmode_call;
34 void (*realmode_interrupt)(u32 intno, u32 eax, u32 ebx, u32 ecx, u32 edx,
35 u32 esi, u32 edi) __attribute__((regparm(0))) = (void *)&__realmode_interrupt;
37 static void setup_bda(void)
39 /* clear BIOS DATA AREA */
40 memset((void *)0x400, 0, 0x200);
42 write16(0x413, FAKE_MEMORY_SIZE / 1024);
43 write16(0x40e, INITIAL_EBDA_SEGMENT);
46 memset((void *)(INITIAL_EBDA_SEGMENT << 4), 0, INITIAL_EBDA_SIZE);
47 write16((INITIAL_EBDA_SEGMENT << 4) + 0x0, INITIAL_EBDA_SIZE / 1024);
50 static void setup_rombios(void)
52 const char date[] = "06/11/99";
53 memcpy((void *)0xffff5, &date, 8);
55 const char ident[] = "PCI_ISA";
56 memcpy((void *)0xfffd9, &ident, 7);
58 /* system model: IBM-AT */
59 write8(0xffffe, 0xfc);
62 int (*intXX_handler[256])(struct eregs *regs) = { NULL };
64 static int intXX_exception_handler(struct eregs *regs)
66 printk(BIOS_INFO, "Oops, exception %d while executing option rom\n",
69 // Odd: The i945GM VGA oprom chokes on a pushl %eax and will
70 // die with an exception #6 if we run the coreboot exception
71 // handler. Just continue, as it executes fine.
72 x86_exception(regs); // Call coreboot exception handler
75 return 0; // Never returns?
78 static int intXX_unknown_handler(struct eregs *regs)
80 printk(BIOS_INFO, "Unsupported software interrupt #0x%x eax 0x%x\n",
81 regs->vector, regs->eax);
86 /* setup interrupt handlers for mainboard */
87 void mainboard_interrupt_handlers(int intXX, void *intXX_func)
89 intXX_handler[intXX] = intXX_func;
92 static void setup_interrupt_handlers(void)
96 /* The first 16 intXX functions are not BIOS services,
97 * but the CPU-generated exceptions ("hardware interrupts")
99 for (i = 0; i < 0x10; i++)
100 intXX_handler[i] = &intXX_exception_handler;
102 /* Mark all other intXX calls as unknown first */
103 for (i = 0x10; i < 0x100; i++)
105 /* If the mainboard_interrupt_handler isn't called first.
107 if(!intXX_handler[i])
109 /* Now set the default functions that are actually
110 * needed to initialize the option roms. This is very
111 * slick, as it allows us to implement mainboard specific
112 * interrupt handlers, such as the int15
116 intXX_handler[0x10] = &int10_handler;
119 intXX_handler[0x12] = &int12_handler;
122 intXX_handler[0x16] = &int16_handler;
125 intXX_handler[0x1a] = &int1a_handler;
128 intXX_handler[i] = &intXX_unknown_handler;
135 static void write_idt_stub(void *target, u8 intnum)
137 unsigned char *codeptr;
138 codeptr = (unsigned char *) target;
139 memcpy(codeptr, &__idt_handler, (size_t)&__idt_handler_size);
140 codeptr[3] = intnum; /* modify int# in the code stub. */
143 static void setup_realmode_idt(void)
145 struct realmode_idt *idts = (struct realmode_idt *) 0;
148 /* Copy IDT stub code for each interrupt. This might seem wasteful
149 * but it is really simple
151 for (i = 0; i < 256; i++) {
153 idts[i].offset = 0x1000 + (i * (u32)&__idt_handler_size);
154 write_idt_stub((void *)((u32 )idts[i].offset), i);
157 /* Many option ROMs use the hard coded interrupt entry points in the
158 * system bios. So install them at the known locations.
161 /* int42 is the relocated int10 */
162 write_idt_stub((void *)0xff065, 0x42);
163 /* BIOS Int 11 Handler F000:F84D */
164 write_idt_stub((void *)0xff84d, 0x11);
165 /* BIOS Int 12 Handler F000:F841 */
166 write_idt_stub((void *)0xff841, 0x12);
167 /* BIOS Int 13 Handler F000:EC59 */
168 write_idt_stub((void *)0xfec59, 0x13);
169 /* BIOS Int 14 Handler F000:E739 */
170 write_idt_stub((void *)0xfe739, 0x14);
171 /* BIOS Int 15 Handler F000:F859 */
172 write_idt_stub((void *)0xff859, 0x15);
173 /* BIOS Int 16 Handler F000:E82E */
174 write_idt_stub((void *)0xfe82e, 0x16);
175 /* BIOS Int 17 Handler F000:EFD2 */
176 write_idt_stub((void *)0xfefd2, 0x17);
177 /* ROM BIOS Int 1A Handler F000:FE6E */
178 write_idt_stub((void *)0xffe6e, 0x1a);
181 void run_bios(struct device *dev, unsigned long addr)
183 u32 num_dev = (dev->bus->secondary << 8) | dev->path.pci.devfn;
185 /* Set up BIOS Data Area */
188 /* Set up some legacy information in the F segment */
191 /* Set up C interrupt handlers */
192 setup_interrupt_handlers();
194 /* Set up real-mode IDT */
195 setup_realmode_idt();
197 memcpy(REALMODE_BASE, &__realmode_code, (size_t)&__realmode_code_size);
198 printk(BIOS_SPEW, "Real mode stub @%p: %d bytes\n", REALMODE_BASE,
199 (u32)&__realmode_code_size);
201 printk(BIOS_DEBUG, "Calling Option ROM...\n");
202 /* TODO ES:DI Pointer to System BIOS PnP Installation Check Structure */
203 /* Option ROM entry point is at OPROM start + 3 */
204 realmode_call(addr + 0x0003, num_dev, 0xffff, 0x0000, 0xffff, 0x0, 0x0);
205 printk(BIOS_DEBUG, "... Option ROM returned.\n");
209 #include <cpu/amd/lxdef.h>
210 #include <cpu/amd/vr.h>
213 #define VSA2_BUFFER 0x60000
214 #define VSA2_ENTRY_POINT 0x60020
216 // TODO move to a header file.
217 void do_vsmbios(void);
219 /* VSA virtual register helper */
220 static u32 VSA_vrRead(u16 classIndex)
222 u32 eax, ebx, ecx, edx;
224 "movw $0x0AC1C, %%dx\n"
225 "orl $0x0FC530000, %%eax\n"
229 : "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
236 void do_vsmbios(void)
238 printk(BIOS_DEBUG, "Preparing for VSA...\n");
240 /* Set up C interrupt handlers */
241 setup_interrupt_handlers();
243 /* Setting up realmode IDT */
244 setup_realmode_idt();
246 memcpy(REALMODE_BASE, &__realmode_code, (size_t)&__realmode_code_size);
247 printk(BIOS_SPEW, "VSA: Real mode stub @%p: %d bytes\n", REALMODE_BASE,
248 (u32)&__realmode_code_size);
250 if ((unsigned int)cbfs_load_stage("vsa") != VSA2_ENTRY_POINT) {
251 printk(BIOS_ERR, "Failed to load VSA.\n");
255 unsigned char *buf = (unsigned char *)VSA2_BUFFER;
256 printk(BIOS_DEBUG, "VSA: Buffer @%p *[0k]=%02x\n", buf, buf[0]);
257 printk(BIOS_DEBUG, "VSA: Signature *[0x20-0x23] is %02x:%02x:%02x:%02x\n",
258 buf[0x20], buf[0x21], buf[0x22], buf[0x23]);
260 /* Check for code to emit POST code at start of VSA. */
261 if ((buf[0x20] != 0xb0) || (buf[0x21] != 0x10) ||
262 (buf[0x22] != 0xe6) || (buf[0x23] != 0x80)) {
263 printk(BIOS_WARNING, "VSA: Signature incorrect. Install failed.\n");
267 printk(BIOS_DEBUG, "Calling VSA module...\n");
269 /* ECX gets SMM, EDX gets SYSMEM */
270 realmode_call(VSA2_ENTRY_POINT, 0x0, 0x0, MSR_GLIU0_SMM,
271 MSR_GLIU0_SYSMEM, 0x0, 0x0);
273 printk(BIOS_DEBUG, "... VSA module returned.\n");
275 /* Restart timer 1 */
279 /* Check that VSA is running OK */
280 if (VSA_vrRead(SIGNATURE) == VSA2_SIGNATURE)
281 printk(BIOS_DEBUG, "VSM: VSA2 VR signature verified.\n");
283 printk(BIOS_ERR, "VSM: VSA2 VR signature not valid. Install failed.\n");
287 /* interrupt_handler() is called from assembler code only,
288 * so there is no use in putting the prototype into a header file.
290 int __attribute__((regparm(0))) interrupt_handler(u32 intnumber,
296 u32 cs_ip, u16 stackflags);
298 int __attribute__((regparm(0))) interrupt_handler(u32 intnumber,
304 u32 cs_ip, u16 stackflags)
310 struct eregs reg_info;
316 #if CONFIG_REALMODE_DEBUG
317 printk(BIOS_DEBUG, "oprom: INT# 0x%x\n", intnumber);
318 printk(BIOS_DEBUG, "oprom: eax: %08x ebx: %08x ecx: %08x edx: %08x\n",
320 printk(BIOS_DEBUG, "oprom: ebp: %08x esp: %08x edi: %08x esi: %08x\n",
322 printk(BIOS_DEBUG, "oprom: ip: %04x cs: %04x flags: %08x\n",
326 // Fetch arguments from the stack and put them into
327 // a structure that we want to pass on to our sub interrupt
329 reg_info = (struct eregs) {
345 // Call the interrupt handler for this int#
346 ret = intXX_handler[intnumber](®_info);
348 // Put registers back on the stack. The assembler code
349 // will later pop them.
350 // What happens here is that we force (volatile!) changing
351 // the values of the parameters of this function. We do this
352 // because we know that they stay alive on the stack after
353 // we leave this function. Don't say this is bollocks.
354 *(volatile u32 *)&eax = reg_info.eax;
355 *(volatile u32 *)&ecx = reg_info.ecx;
356 *(volatile u32 *)&edx = reg_info.edx;
357 *(volatile u32 *)&ebx = reg_info.ebx;
358 *(volatile u32 *)&esi = reg_info.esi;
359 *(volatile u32 *)&edi = reg_info.edi;
360 flags = reg_info.eflags;
362 /* Pass errors back to our caller via the CARRY flag */
364 printk(BIOS_DEBUG,"int%02x call returned error.\n", intnumber);
365 flags |= 1; // error: set carry
367 flags &= ~1; // no error: clear carry
369 *(volatile u16 *)&stackflags = flags;