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>
29 #define REALMODE_BASE ((void *)0x600)
35 void x86_exception(struct eregs *info);
37 extern unsigned char __idt_handler, __idt_handler_size;
38 extern unsigned char __realmode_code, __realmode_code_size;
39 extern unsigned char __run_optionrom, __run_interrupt;
40 extern unsigned char __run_vsa;
42 void (*run_optionrom)(u32 devfn) __attribute__((regparm(0))) = (void *)&__run_optionrom;
43 void (*vga_enable_console)(void) __attribute__((regparm(0))) = (void *)&__run_interrupt;
45 int (*intXX_handler[256])(struct eregs *regs) = { NULL };
47 static int intXX_exception_handler(struct eregs *regs)
49 printk(BIOS_INFO, "Oops, exception %d while executing option rom\n",
51 x86_exception(regs); // Call coreboot exception handler
53 return 0; // Never returns?
56 static int intXX_unknown_handler(struct eregs *regs)
58 printk(BIOS_INFO, "Unsupported software interrupt #0x%x\n",
64 /* setup interrupt handlers for mainboard */
65 void mainboard_interrupt_handlers(int intXX, void *intXX_func)
67 intXX_handler[intXX] = intXX_func;
70 int int12_handler(struct eregs *regs);
71 int int15_handler(struct eregs *regs);
72 int int1a_handler(struct eregs *regs);
74 static void setup_interrupt_handlers(void)
78 /* The first 16 intXX functions are not BIOS services,
79 * but the CPU-generated exceptions ("hardware interrupts")
81 for (i = 0; i < 0x10; i++)
82 intXX_handler[i] = &intXX_exception_handler;
84 /* Mark all other intXX calls as unknown first */
85 for (i = 0x10; i < 0x100; i++)
87 /* If the mainboard_interrupt_handler isn't called first.
91 /* Now set the default functions that are actually
92 * needed to initialize the option roms. This is very
93 * slick, as it allows us to implement mainboard specific
94 * interrupt handlers, such as the int15
98 intXX_handler[0x12] = &int12_handler;
101 intXX_handler[0x15] = &int15_handler;
104 intXX_handler[0x1a] = &int1a_handler;
107 intXX_handler[i] = &intXX_unknown_handler;
114 static void write_idt_stub(void *target, u8 intnum)
116 unsigned char *codeptr;
117 codeptr = (unsigned char *) target;
118 memcpy(codeptr, &__idt_handler, (size_t)&__idt_handler_size);
119 codeptr[3] = intnum; /* modify int# in the code stub. */
122 static void setup_realmode_idt(void)
124 struct realmode_idt *idts = (struct realmode_idt *) 0;
127 /* Copy IDT stub code for each interrupt. This might seem wasteful
128 * but it is really simple
130 for (i = 0; i < 256; i++) {
132 idts[i].offset = 0x1000 + (i * (u32)&__idt_handler_size);
133 write_idt_stub((void *)((u32 )idts[i].offset), i);
136 /* Many option ROMs use the hard coded interrupt entry points in the
137 * system bios. So install them at the known locations.
138 * Only need int10 so far.
141 /* int42 is the relocated int10 */
142 write_idt_stub((void *)0xff065, 0x42);
145 void run_bios(struct device *dev, unsigned long addr)
147 /* clear vga bios data area */
148 memset((void *)0x400, 0, 0x200);
150 /* Set up C interrupt handlers */
151 setup_interrupt_handlers();
153 /* Setting up realmode IDT */
154 setup_realmode_idt();
156 memcpy(REALMODE_BASE, &__realmode_code, (size_t)&__realmode_code_size);
157 printk(BIOS_SPEW, "Real mode stub @%p: %d bytes\n", REALMODE_BASE,
158 (u32)&__realmode_code_size);
160 printk(BIOS_DEBUG, "Calling Option ROM...\n");
161 run_optionrom((dev->bus->secondary << 8) | dev->path.pci.devfn);
162 printk(BIOS_DEBUG, "... Option ROM returned.\n");
165 #if defined(CONFIG_GEODE_VSA) && CONFIG_GEODE_VSA
166 #include <cpu/amd/lxdef.h>
167 #include <cpu/amd/vr.h>
170 #define VSA2_BUFFER 0x60000
171 #define VSA2_ENTRY_POINT 0x60020
173 void (*run_vsa)(u32 smm, u32 sysmem) __attribute__((regparm(0))) = (void *)&__run_vsa;
175 // TODO move to a header file.
176 void do_vsmbios(void);
178 /* VSA virtual register helper */
179 static u32 VSA_vrRead(u16 classIndex)
181 u32 eax, ebx, ecx, edx;
183 "movw $0x0AC1C, %%dx\n"
184 "orl $0x0FC530000, %%eax\n"
188 : "=a" (eax), "=b"(ebx), "=c"(ecx), "=d"(edx)
195 void do_vsmbios(void)
197 printk(BIOS_DEBUG, "Preparing for VSA...\n");
199 /* clear bios data area */
200 memset((void *)0x400, 0, 0x200);
202 /* Set up C interrupt handlers */
203 setup_interrupt_handlers();
205 /* Setting up realmode IDT */
206 setup_realmode_idt();
208 memcpy(REALMODE_BASE, &__realmode_code, (size_t)&__realmode_code_size);
209 printk(BIOS_SPEW, "VSA: Real mode stub @%p: %d bytes\n", REALMODE_BASE,
210 (u32)&__realmode_code_size);
212 if ((unsigned int)cbfs_load_stage("vsa") != VSA2_ENTRY_POINT) {
213 printk(BIOS_ERR, "Failed to load VSA.\n");
217 unsigned char *buf = (unsigned char *)VSA2_BUFFER;
218 printk(BIOS_DEBUG, "VSA: Buffer @%p *[0k]=%02x\n", buf, buf[0]);
219 printk(BIOS_DEBUG, "VSA: Signature *[0x20-0x23] is %02x:%02x:%02x:%02x\n",
220 buf[0x20], buf[0x21], buf[0x22], buf[0x23]);
222 /* Check for code to emit POST code at start of VSA. */
223 if ((buf[0x20] != 0xb0) || (buf[0x21] != 0x10) ||
224 (buf[0x22] != 0xe6) || (buf[0x23] != 0x80)) {
225 printk(BIOS_WARNING, "VSA: Signature incorrect. Install failed.\n");
229 printk(BIOS_DEBUG, "Calling VSA module...\n");
230 /* ECX gets SMM, EDX gets SYSMEM */
231 run_vsa(MSR_GLIU0_SMM, MSR_GLIU0_SYSMEM);
232 printk(BIOS_DEBUG, "... VSA module returned.\n");
234 /* Restart timer 1 */
238 /* Check that VSA is running OK */
239 if (VSA_vrRead(SIGNATURE) == VSA2_SIGNATURE)
240 printk(BIOS_DEBUG, "VSM: VSA2 VR signature verified.\n");
242 printk(BIOS_ERR, "VSM: VSA2 VR signature not valid. Install failed.\n");
246 /* interrupt_handler() is called from assembler code only,
247 * so there is no use in putting the prototype into a header file.
249 int __attribute__((regparm(0))) interrupt_handler(u32 intnumber,
255 u32 cs_ip, u16 stackflags);
257 int __attribute__((regparm(0))) interrupt_handler(u32 intnumber,
263 u32 cs_ip, u16 stackflags)
269 struct eregs reg_info;
275 printk(BIOS_DEBUG, "oprom: INT# 0x%x\n", intnumber);
276 printk(BIOS_DEBUG, "oprom: eax: %08x ebx: %08x ecx: %08x edx: %08x\n",
278 printk(BIOS_DEBUG, "oprom: ebp: %08x esp: %08x edi: %08x esi: %08x\n",
280 printk(BIOS_DEBUG, "oprom: ip: %04x cs: %04x flags: %08x\n",
283 // Fetch arguments from the stack and put them into
284 // a structure that we want to pass on to our sub interrupt
286 reg_info = (struct eregs) {
302 // Call the interrupt handler for this int#
303 ret = intXX_handler[intnumber](®_info);
305 // Put registers back on the stack. The assembler code
306 // will later pop them.
307 // What happens here is that we force (volatile!) changing
308 // the values of the parameters of this function. We do this
309 // because we know that they stay alive on the stack after
310 // we leave this function. Don't say this is bollocks.
311 *(volatile u32 *)&eax = reg_info.eax;
312 *(volatile u32 *)&ecx = reg_info.ecx;
313 *(volatile u32 *)&edx = reg_info.edx;
314 *(volatile u32 *)&ebx = reg_info.ebx;
315 *(volatile u32 *)&esi = reg_info.esi;
316 *(volatile u32 *)&edi = reg_info.edi;
317 flags = reg_info.eflags;
319 /* Pass errors back to our caller via the CARRY flag */
321 printk(BIOS_DEBUG,"error!\n");
322 flags |= 1; // error: set carry
324 flags &= ~1; // no error: clear carry
326 *(volatile u16 *)&stackflags = flags;