1 #include <console/console.h>
2 #include <device/pci.h>
3 #include <device/pci_ids.h>
4 #include <device/pci_ops.h>
11 /* vgabios.c. Derived from: */
13 /*------------------------------------------------------------ -*- C -*-
14 * 2 Kernel Monte a.k.a. Linux loading Linux on x86
16 * Erik Arjan Hendriks <hendriks@lanl.gov>
18 * This version is a derivative of the original two kernel monte
19 * which is (C) 2000 Scyld.
21 * Copyright (C) 2000 Scyld Computing Corporation
23 * This program is free software; you can redistribute it and/or modify
24 * it under the terms of the GNU General Public License as published by
25 * the Free Software Foundation; version 2 of the License.
27 * This program is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
30 * GNU General Public License for more details.
32 * You should have received a copy of the GNU General Public License
33 * along with this program; if not, write to the Free Software
34 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
36 * Portions related to the alpha architecture are:
38 * Copyright(C) 2001 University of California. LA-CC Number 01-67.
39 * This software has been authored by an employee or employees of the
40 * University of California, operator of the Los Alamos National
41 * Laboratory under Contract No. W-7405-ENG-36 with the U.S.
42 * Department of Energy. The U.S. Government has rights to use,
43 * reproduce, and distribute this software. If the software is
44 * modified to produce derivative works, such modified software should
45 * be clearly marked, so as not to confuse it with the version
46 * available from LANL.
48 * This software may be used and distributed according to the terms
49 * of the GNU General Public License, incorporated herein by
50 * reference to http://www.gnu.org/licenses/gpl.html.
52 * This software is provided by the author(s) "as is" and any express
53 * or implied warranties, including, but not limited to, the implied
54 * warranties of merchantability and fitness for a particular purpose
55 * are disclaimed. In no event shall the author(s) be liable for any
56 * direct, indirect, incidental, special, exemplary, or consequential
57 * damages (including, but not limited to, procurement of substitute
58 * goods or services; loss of use, data, or profits; or business
59 * interruption) however caused and on any theory of liability,
60 * whether in contract, strict liability, or tort (including
61 * negligence or otherwise) arising in any way out of the use of this
62 * software, even if advised of the possibility of such damage.
64 * $Id: vgabios.c,v 1.5 2004/10/06 17:33:52 rminnich Exp $
65 *--------------------------------------------------------------------*/
67 /* Modified to be a self sufficient plug in so that it can be used
68 without reliance on other parts of coreboot's core
69 (C) 2005 Nick.Barker9@btinternet.com
71 Used initially for epia-m where there are problems getting the bios
72 emulator to successfully run this bios.
74 /* Declare a temporary global descriptor table - necessary because the
75 Core part of the bios no longer sets up any 16 bit segments */
77 /* pointer to original gdt */
81 /* compute the table limit */
82 "__mygdt_limit = __mygdt_end - __mygdt - 1 \n"
84 " .word __mygdt_limit \n"
87 /* selgdt 0, unused */
88 " .word 0x0000, 0x0000 \n"
89 " .byte 0x00, 0x00, 0x00, 0x00 \n"
90 /* selgdt 8, unused */
91 " .word 0x0000, 0x0000 \n"
92 " .byte 0x00, 0x00, 0x00, 0x00 \n"
93 /* selgdt 0x10, flat code segment */
94 " .word 0xffff, 0x0000 \n"
95 " .byte 0x00, 0x9b, 0xcf, 0x00 \n"
96 /* selgdt 0x18, flat data segment */
97 " .word 0xffff, 0x0000 \n"
98 " .byte 0x00, 0x93, 0xcf, 0x00 \n"
99 /* selgdt 0x20, unused */
100 " .word 0x0000, 0x0000 \n"
101 " .byte 0x00, 0x00, 0x00, 0x00 \n"
102 /* selgdt 0x28 16-bit 64k code at 0x00000000 */
103 " .word 0xffff, 0x0000 \n"
104 " .byte 0, 0x9a, 0, 0 \n"
105 /* selgdt 0x30 16-bit 64k data at 0x00000000 */
106 " .word 0xffff, 0x0000 \n"
107 " .byte 0, 0x92, 0, 0 \n"
110 /* Declare a pointer to where our idt is going to be i.e. at mem zero */
111 __asm__("__myidt: \n"
115 " .long 0 \n" " .word 0 \n");
117 /* The address arguments to this function are PHYSICAL ADDRESSES */
118 extern u8 acpi_sleep_type;
120 static void real_mode_switch_call_vga(unsigned long devfn)
122 if ((acpi_sleep_type == 0)/* && (PAYLOAD_IS_SEABIOS == 1)*/)
124 __asm__ __volatile__(
125 // paranoia -- does ecx get saved? not sure. This is
126 // the easiest safe thing to do.
129 " mov %esp, __stack \n"
131 "__stack: .long 0 \n" "1:\n"
132 /* get devfn into %ecx */
133 " movl %esp, %ebp \n"
134 " movl 8(%ebp), %ecx \n"
136 " lgdt %cs:__mygdtaddr \n"
137 /* This configures CS properly for real mode. */
138 " ljmp $0x28, $__rms_16bit\n"
141 /* 16 bit code from here on... */
142 /* Load the segment registers w/ properly configured segment
143 * descriptors. They will retain these configurations (limits,
144 * writability, etc.) once protected mode is turned off. */
151 /* Turn off protection (bit 0 in CR0) */
152 " movl %cr0, %eax \n"
153 " andl $0xFFFFFFFE, %eax \n"
154 " movl %eax, %cr0 \n"
155 /* Now really going into real mode */
156 " ljmp $0, $__rms_real\n"
158 /* put the stack at the end of page zero.
159 * that way we can easily share it between real and protected,
160 * since the 16-bit ESP at segment 0 will work for any case.
164 " movl $0x1000, %eax \n"
165 " movl %eax, %esp \n"
166 /* Load our 16 it idt */
170 /* Dump zeros in the other segregs */
177 /* run VGA BIOS at 0xc000:0003 */
178 " lcall $0xc000, $0x0003\n"
179 /* if we got here, just about done.
180 * Need to get back to protected mode */
181 " movl %cr0, %eax \n" " orl $0x0000001, %eax\n" /* PE = 1 */
182 " movl %eax, %cr0 \n"
183 /* Now that we are in protected mode jump to a 32 bit code segment. */
184 " data32 ljmp $0x10, $vgarestart\n"
187 " movw $0x18, %ax \n"
193 /* restore proper gdt and idt */
194 " lgdt %cs:gdtarg \n"
198 " mov __stack, %esp \n"
202 __asm__(".text\n" "real_mode_switch_end:\n");
203 extern char real_mode_switch_end[];
205 /* call vga bios int 10 function 0x4f14 to enable main console
206 epia-m does not always autosence the main console so forcing it on is good !! */
207 void vga_enable_console()
209 if ((acpi_sleep_type == 0)/* && (PAYLOAD_IS_SEABIOS == 1)*/)
211 __asm__ __volatile__(
212 /* paranoia -- does ecx get saved? not sure. This is
213 * the easiest safe thing to do. */
216 " mov %esp, __stack \n"
218 " lgdt %cs:__mygdtaddr \n"
219 /* This configures CS properly for real mode. */
220 " ljmp $0x28, $__vga_ec_16bit\n"
223 /* 16 bit code from here on... */
224 /* Load the segment registers w/ properly configured segment
225 * descriptors. They will retain these configurations (limits,
226 * writability, etc.) once protected mode is turned off. */
233 /* Turn off protection (bit 0 in CR0) */
234 " movl %cr0, %eax \n"
235 " andl $0xFFFFFFFE, %eax\n"
236 " movl %eax, %cr0 \n"
237 /* Now really going into real mode */
238 " ljmp $0, $__vga_ec_real \n"
240 /* put the stack at the end of page zero.
241 * that way we can easily share it between real and protected,
242 * since the 16-bit ESP at segment 0 will work for any case.
246 " movl $0x1000, %eax \n"
247 " movl %eax, %esp \n"
248 /* debugging for RGM */
250 " outb %al, $0x80 \n"
251 /* Load our 16 it idt */
255 /* Dump zeros in the other segregs */
260 /* ask bios to enable main console */
261 /* set up for int 10 call - values found from X server
262 * bios call routines */
263 " movw $0x4f14,%ax \n"
264 " movw $0x8003,%bx \n"
269 " movb $0x55, %al \n"
270 " outb %al, $0x80 \n"
271 /* if we got here, just about done.
272 * Need to get back to protected mode */
273 " movl %cr0, %eax \n" " orl $0x0000001, %eax\n" /* PE = 1 */
274 " movl %eax, %cr0 \n"
275 /* Now that we are in protected mode jump to a 32 bit code segment. */
276 " data32 ljmp $0x10, $vga_ec_restart\n"
279 " movw $0x18, %ax \n"
285 /* restore proper gdt and idt */
286 " lgdt %cs:gdtarg \n"
288 " .globl vga__ec_exit \n"
290 " mov __stack, %esp \n"
294 void do_vgabios(void)
297 unsigned long busdevfn;
298 unsigned int rom = 0;
300 unsigned int size = 64 * 1024;
305 printk_emerg("file '%s', line %d\n\n", __FILE__, __LINE__);
307 /* clear vga bios data area */
308 for (i = 0x400; i < 0x500; i++) {
309 *(unsigned char *)i = 0;
312 dev = dev_find_class(PCI_CLASS_DISPLAY_VGA << 8, 0);
315 printk_debug("NO VGA FOUND\n");
318 printk_debug("found VGA: vid=%x, did=%x\n", dev->vendor, dev->device);
320 /* declare rom address here - keep any config data out of the way
321 * of core LXB stuff */
323 rom = cbfs_load_optionrom(dev->vendor, dev->device, 0);
324 pci_write_config32(dev, PCI_ROM_ADDRESS, rom | 1);
325 printk_debug("rom base: %x\n", rom);
326 buf = (unsigned char *)rom;
327 printk_emerg("file '%s', line %d\n\n", __FILE__, __LINE__);
329 if ((buf[0] == 0x55) && (buf[1] == 0xaa)) {
330 memcpy((void *)0xc0000, buf, size);
332 printk_emerg("file '%s', line %d\n\n", __FILE__, __LINE__);
334 write_protect_vgabios(); // in northbridge
336 // check signature again
337 buf = (unsigned char *)0xc0000;
338 if (buf[0] == 0x55 && buf[1] == 0xAA) {
340 (dev->bus->secondary << 8) | dev->path.pci.devfn;
341 printk_debug("bus/devfn = %#x\n", busdevfn);
342 real_mode_switch_call_vga(busdevfn);
344 printk_debug("Failed to copy VGA BIOS to 0xc0000\n");
346 printk_debug("BAD SIGNATURE 0x%x 0x%x\n", buf[0], buf[1]);
348 printk_emerg("file '%s', line %d\n\n", __FILE__, __LINE__);
350 pci_write_config32(dev, PCI_ROM_ADDRESS, 0);
353 // we had hoped to avoid this.
354 // this is a stub IDT only. It's main purpose is to ignore calls
356 // no longer. Dammit. We have to respond to these.
358 unsigned short offset, cs;
361 // from a handy writeup that andrey found.
364 // There are some assumptions we can make here.
365 // First, the Top Of Stack (TOS) is located on the top of page zero.
366 // we can share this stack between real and protected mode.
367 // that simplifies a lot of things ...
368 // we'll just push all the registers on the stack as longwords,
369 // and pop to protected mode.
370 // second, since this only ever runs as part of coreboot,
371 // we know all the segment register values -- so we don't save any.
372 // keep the handler that calls things small. It can do a call to
373 // more complex code in coreboot itself. This helps a lot as we don't
374 // have to do address fixup in this little stub, and calls are absolute
375 // so the handler is relocatable.
378 __asm__ __volatile__(" .code16 \n"
382 " ljmp $0, $callbiosint16\n"
387 void debughandler(void)
389 __asm__ __volatile__(" .code16 \n"
397 "end_debughandle: \n" ".code32 \n");
400 // Calling conventions. The first C function is called with this stuff
401 // on the stack. They look like value parameters, but note that if you
402 // modify them they will go back to the INTx function modified.
403 // the C function will call the biosint function with these as
404 // REFERENCE parameters. In this way, we can easily get
405 // returns back to the INTx caller (i.e. vgabios)
406 void callbiosint(void)
408 __asm__ __volatile__(" .code16 \n"
412 " push %fs \n" " push %gs \n"
413 // clean up the int #. To save space we put it in the lower
414 // byte. But the top 24 bits are junk.
415 " andl $0xff, %eax\n"
416 // this push does two things:
417 // - put the INT # on the stack as a parameter
418 // - provides us with a temp for the %cr0 mods.
419 " pushl %eax \n" " movl %cr0, %eax\n" " orl $0x00000001, %eax\n" /* PE = 1 */
421 /* Now that we are in protected mode jump to a 32 bit code segment. */
422 " data32 ljmp $0x10, $biosprotect\n"
425 " movw $0x18, %ax \n"
433 // back to real mode ...
434 " ljmp $0x28, $__rms_16bit2\n"
437 /* 16 bit code from here on... */
438 /* Load the segment registers w/ properly configured segment
439 * descriptors. They will retain these configurations (limits,
440 * writability, etc.) once protected mode is turned off. */
447 /* Turn off protection (bit 0 in CR0) */
448 " movl %cr0, %eax \n"
449 " andl $0xFFFFFFFE, %eax \n"
450 " movl %eax, %cr0 \n"
451 /* Now really going into real mode */
452 " ljmp $0, $__rms_real2 \n"
455 * FixME: where is esp? */
458 /* ebugging for RGM */
460 " outb %al, $0x80 \n"
461 /* Load our 16 it idt */
465 /* Dump zeros in the other segregs */
471 /* pop the INT # that you pushed earlier */
487 int pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
488 unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
489 unsigned long *pecx, unsigned long *peax, unsigned long *pflags);
491 int handleint21(unsigned long *pedi, unsigned long *pesi,
492 unsigned long *pebp, unsigned long *pesp,
493 unsigned long *pebx, unsigned long *pedx,
494 unsigned long *pecx, unsigned long *peax,
495 unsigned long *pflags);
497 extern void vga_exit(void);
499 int biosint(unsigned long intnumber,
500 unsigned long gsfs, unsigned long dses,
501 unsigned long edi, unsigned long esi,
502 unsigned long ebp, unsigned long esp,
503 unsigned long ebx, unsigned long edx,
504 unsigned long ecx, unsigned long eax,
505 unsigned long cs_ip, unsigned short stackflags)
516 printk_debug("biosint: INT# 0x%lx\n", intnumber);
517 printk_debug("biosint: eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
519 printk_debug("biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n",
521 printk_debug("biosint: ip 0x%x cs 0x%x flags 0x%x\n",
524 // cases in a good compiler are just as good as your own tables.
526 case 0: case 1: case 2: case 3: case 4: case 5:
527 case 6: case 7: case 8: case 9: case 10:
528 case 11: case 12: case 13: case 14: case 15:
529 // These are not BIOS service, but the CPU-generated exceptions
530 printk_info("biosint: Oops, exception %u\n", intnumber);
532 printk_debug("Stack contents: ");
533 while (esp < 0x1000) {
534 printk_debug("0x%04x ", *(unsigned short *)esp);
539 printk_debug("biosint: Bailing out\n");
541 if ((acpi_sleep_type == 3)/* || (PAYLOAD_IS_SEABIOS == 0)*/) // add this to keep same with kevin's seabios patch in 2008-9-8
546 ret = pcibios(&edi, &esi, &ebp, &esp,
547 &ebx, &edx, &ecx, &eax, &flags);
555 ret = handleint21(&edi, &esi, &ebp, &esp,
556 &ebx, &edx, &ecx, &eax, &flags);
559 printk_info("BIOSINT: Unsupport int #0x%x\n", intnumber);
563 flags |= 1; // carry flags
570 void setup_realmode_idt(void)
572 extern unsigned char idthandle, end_idthandle;
573 extern unsigned char debughandle, end_debughandle;
576 struct realidt *idts = (struct realidt *)0;
577 int codesize = &end_idthandle - &idthandle;
578 unsigned char *intbyte, *codeptr;
580 // for each int, we create a customized little handler
581 // that just pushes %ax, puts the int # in %al,
582 // then calls the common interrupt handler.
583 // this necessitated because intel didn't know much about
584 // architecture when they did the 8086 (it shows)
585 // (hmm do they know anymore even now :-)
586 // obviously you can see I don't really care about memory
587 // efficiency. If I did I would probe back through the stack
588 // and get it that way. But that's really disgusting.
589 for (i = 0; i < 256; i++) {
591 codeptr = (char *)4096 + i * codesize;
592 idts[i].offset = (unsigned)codeptr;
593 memcpy(codeptr, &idthandle, codesize);
594 intbyte = codeptr + 3;
598 // fixed entry points
600 // VGA BIOSes tend to hardcode f000:f065 as the previous handler of
602 // calling convention here is the same as INTs, we can reuse
603 // the int entry code.
604 codeptr = (char *)0xff065;
605 memcpy(codeptr, &idthandle, codesize);
606 intbyte = codeptr + 3;
607 *intbyte = 0x42; /* int42 is the relocated int10 */
610 VBIOS will call f000:f859 instead of sending int15.
611 calling convertion here is the same as INTs, we can reuse the int entry code.
613 codeptr = (char *)0xff859;
614 memcpy(codeptr, &idthandle, codesize);
615 intbyte = codeptr + 3;
618 /* debug handler - useful to set a programmable delay between instructions if the
619 TF bit is set upon call to real mode */
621 idts[1].offset = 16384;
622 memcpy(16384, &debughandle, &end_debughandle - &debughandle);
629 READCONFBYTE = 0xb108,
630 READCONFWORD = 0xb109,
631 READCONFDWORD = 0xb10a,
632 WRITECONFBYTE = 0xb10b,
633 WRITECONFWORD = 0xb10c,
634 WRITECONFDWORD = 0xb10d
637 // errors go in AH. Just set these up so that word assigns
640 PCIBIOS_NODEV = 0x8600,
641 PCIBIOS_BADREG = 0x8700
645 pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
646 unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
647 unsigned long *pecx, unsigned long *peax, unsigned long *pflags)
649 unsigned long edi = *pedi;
650 unsigned long esi = *pesi;
651 unsigned long ebp = *pebp;
652 unsigned long esp = *pesp;
653 unsigned long ebx = *pebx;
654 unsigned long edx = *pedx;
655 unsigned long ecx = *pecx;
656 unsigned long eax = *peax;
657 unsigned long flags = *pflags;
658 unsigned short func = (unsigned short)eax;
660 unsigned short devid, vendorid, devfn;
661 short devindex; /* Use short to get rid of garbage in upper half of 32-bit register */
677 while ((dev = dev_find_device(vendorid, devid, dev))) {
683 unsigned short busdevfn;
685 // busnum is an unsigned char;
686 // devfn is an int, so we mask it off.
687 busdevfn = (dev->bus->secondary << 8)
688 | (dev->path.pci.devfn & 0xff);
689 printk_debug("0x%x: return 0x%x\n", func,
694 *peax = PCIBIOS_NODEV;
711 devfn = *pebx & 0xff;
714 dev = dev_find_slot(bus, devfn);
717 ("0x%x: BAD DEVICE bus %d devfn 0x%x\n",
719 // idiots. the pcibios guys assumed you'd never pass a bad bus/devfn!
720 *peax = PCIBIOS_BADREG;
725 byte = pci_read_config8(dev, reg);
729 word = pci_read_config16(dev, reg);
733 dword = pci_read_config32(dev, reg);
738 pci_write_config8(dev, reg, byte);
742 pci_write_config16(dev, reg, word);
746 pci_write_config32(dev, reg, dword);
751 retval = PCIBIOS_BADREG;
753 ("0x%x: bus %d devfn 0x%x reg 0x%x val 0x%lx\n",
754 func, bus, devfn, reg, *pecx);
760 printk_err("UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func);
767 /* return value of int0x15(int21)
768 AH AL Completion status
769 ?? 5Fh Function call supported
770 ?? !=5Fh Function not supported
771 00 5Fh Function call successful
772 01 5Fh Function call failed
774 int handleint21(unsigned long *edi, unsigned long *esi, unsigned long *ebp,
775 unsigned long *esp, unsigned long *ebx, unsigned long *edx,
776 unsigned long *ecx, unsigned long *eax, unsigned long *flags)
779 switch (*eax & 0xffff) {
794 0011: 200MHz ( DDR200 )
795 0100: 266MHz ( DDR266 )
796 0101: 333MHz ( DDR333 )
797 0110: 400MHz ( DDR400 )
798 0111: 533MHz ( DDR I/II 533
799 1000: 667MHz ( DDR I/II 667)
801 N: Frame Buffer Size 2^N MB
805 dev = dev_find_slot(0, PCI_DEVFN(0, 3));
806 i = pci_read_config8(dev, 0xa1);
810 *eax = 0x00; //not support 5f18
815 i = pci_read_config8(dev, 0x90);
819 *ebx = (*ebx) + ((u32) i);
830 *ecx = (*ecx & 0xffffff00) | 2; // panel type = 2 = 1024 * 768
835 *ebx = (*ebx & 0xffff0000) | 2;
836 *ecx = (*ecx & 0xffff0000) | 0x401; // PAL + crt only
837 *edx = (*edx & 0xffff0000) | 0; // TV Layout - default