1 #include <console/console.h>
2 #include <device/pci.h>
3 #include <device/pci_ids.h>
4 #include <device/pci_ops.h>
9 /* what a mess this uncompress thing is. I am not at all happy about how this
10 * was done, but can't fix it yet. RGM
12 #warning "Fix the uncompress once linuxbios knows how to do it"
13 // This GETBIT is supposed to work on little endian
14 // 32bit systems. The algorithm will definitely need
15 // some fixing on other systems, but it might not be
16 // a problem since the nrv2b binary behaves the same..
25 #define GETBIT_8(bb, src, ilen) \
26 (((bb = bb & 0x7f ? bb*2 : ((unsigned)src[ilen++]*2+1)) >> 8) & 1)
28 #define GETBIT_LE16(bb, src, ilen) \
29 (bb*=2,bb&0xffff ? (bb>>16)&1 : (ilen+=2,((bb=(src[ilen-2]+src[ilen-1]*256u)*2+1)>>16)&1))
30 #define GETBIT_LE32(bb, src, ilen) \
31 (bc > 0 ? ((bb>>--bc)&1) : (bc=31,\
32 bb=*(const uint32_t *)((src)+ilen),ilen+=4,(bb>>31)&1))
34 #if ENDIAN == 0 && BITSIZE == 8
35 #define GETBIT(bb, src, ilen) GETBIT_8(bb, src, ilen)
37 #if ENDIAN == 0 && BITSIZE == 16
38 #define GETBIT(bb, src, ilen) GETBIT_LE16(bb, src, ilen)
40 #if ENDIAN == 0 && BITSIZE == 32
41 #define GETBIT(bb, src, ilen) GETBIT_LE32(bb, src, ilen)
44 static unsigned long unrv2b(uint8_t * src, uint8_t * dst)
46 unsigned long ilen = 0, olen = 0, last_m_off = 1;
50 unsigned long file_len = *(unsigned long *) src;
52 printk_debug("compressed file len is supposed to be %d bytes\n", file_len);
55 /* FIXME: check olen with the length stored in first 4 bytes */
58 unsigned int m_off, m_len;
59 while (GETBIT(bb, src, ilen)) {
60 dst[olen++] = src[ilen++];
65 m_off = m_off * 2 + GETBIT(bb, src, ilen);
66 } while (!GETBIT(bb, src, ilen));
70 m_off = (m_off - 3) * 256 + src[ilen++];
71 if (m_off == 0xffffffffU)
76 m_len = GETBIT(bb, src, ilen);
77 m_len = m_len * 2 + GETBIT(bb, src, ilen);
81 m_len = m_len * 2 + GETBIT(bb, src, ilen);
82 } while (!GETBIT(bb, src, ilen));
85 m_len += (m_off > 0xd00);
87 m_pos = dst + olen - m_off;
88 dst[olen++] = *m_pos++;
90 dst[olen++] = *m_pos++;
91 } while (--m_len > 0);
94 printk_debug("computed len is %d, file len is %d\n", olen, file_len);
99 /* vsmsetup.c derived from vgabios.c. Derived from: */
101 /*------------------------------------------------------------ -*- C -*-
102 * 2 Kernel Monte a.k.a. Linux loading Linux on x86
104 * Erik Arjan Hendriks <hendriks@lanl.gov>
106 * This version is a derivative of the original two kernel monte
107 * which is (C) 2000 Scyld.
109 * Copyright (C) 2000 Scyld Computing Corporation
111 * This program is free software; you can redistribute it and/or modify
112 * it under the terms of the GNU General Public License as published by
113 * the Free Software Foundation; either version 2 of the License, or
114 * (at your option) any later version.
116 * This program is distributed in the hope that it will be useful,
117 * but WITHOUT ANY WARRANTY; without even the implied warranty of
118 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
119 * GNU General Public License for more details.
121 * You should have received a copy of the GNU General Public License
122 * along with this program; if not, write to the Free Software
123 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
125 * Portions related to the alpha architecture are:
127 * Copyright(C) 2001 University of California. LA-CC Number 01-67.
128 * This software has been authored by an employee or employees of the
129 * University of California, operator of the Los Alamos National
130 * Laboratory under Contract No. W-7405-ENG-36 with the U.S.
131 * Department of Energy. The U.S. Government has rights to use,
132 * reproduce, and distribute this software. If the software is
133 * modified to produce derivative works, such modified software should
134 * be clearly marked, so as not to confuse it with the version
135 * available from LANL.
137 * This software may be used and distributed according to the terms
138 * of the GNU General Public License, incorporated herein by
139 * reference to http://www.gnu.org/licenses/gpl.html.
141 * This software is provided by the author(s) "as is" and any express
142 * or implied warranties, including, but not limited to, the implied
143 * warranties of merchantability and fitness for a particular purpose
144 * are disclaimed. In no event shall the author(s) be liable for any
145 * direct, indirect, incidental, special, exemplary, or consequential
146 * damages (including, but not limited to, procurement of substitute
147 * goods or services; loss of use, data, or profits; or business
148 * interruption) however caused and on any theory of liability,
149 * whether in contract, strict liability, or tort (including
150 * negligence or otherwise) arising in any way out of the use of this
151 * software, even if advised of the possibility of such damage.
154 *--------------------------------------------------------------------*/
156 /* Modified to be a self sufficient plug in so that it can be used
157 without reliance on other parts of core Linuxbios
158 (C) 2005 Nick.Barker9@btinternet.com
160 Used initially for epia-m where there are problems getting the bios
161 emulator to successfully run this bios.
164 /* Declare a temporary global descriptor table - necessary because the
165 Core part of the bios no longer sets up any 16 bit segments */
167 /* pointer to original gdt */
169 " .word gdt_limit \n"
172 /* compute the table limit */
173 "__mygdt_limit = __mygdt_end - __mygdt - 1 \n"
176 " .word __mygdt_limit \n"
180 /* selgdt 0, unused */
181 " .word 0x0000, 0x0000 \n"
182 " .byte 0x00, 0x00, 0x00, 0x00 \n"
184 /* selgdt 8, unused */
185 " .word 0x0000, 0x0000 \n"
186 " .byte 0x00, 0x00, 0x00, 0x00 \n"
188 /* selgdt 0x10, flat code segment */
189 " .word 0xffff, 0x0000 \n"
190 " .byte 0x00, 0x9b, 0xcf, 0x00 \n"
192 /* selgdt 0x18, flat data segment */
193 " .word 0xffff, 0x0000 \n"
194 " .byte 0x00, 0x93, 0xcf, 0x00 \n"
196 /* selgdt 0x20, unused */
197 " .word 0x0000, 0x0000 \n"
198 " .byte 0x00, 0x00, 0x00, 0x00 \n"
200 /* selgdt 0x28 16-bit 64k code at 0x00000000 */
201 " .word 0xffff, 0x0000 \n"
202 " .byte 0, 0x9a, 0, 0 \n"
204 /* selgdt 0x30 16-bit 64k data at 0x00000000 */
205 " .word 0xffff, 0x0000 \n"
206 " .byte 0, 0x92, 0, 0 \n"
211 /* Declare a pointer to where our idt is going to be i.e. at mem zero */
212 __asm__ ("__myidt: \n"
220 /* The address arguments to this function are PHYSICAL ADDRESSES */
221 static void real_mode_switch_call_vsm(unsigned long smm, unsigned long sysm)
223 __asm__ __volatile__ (
224 // paranoia -- does ecx get saved? not sure. This is
225 // the easiest safe thing to do.
228 " mov %esp, __stack \n"
230 "__stack: .long 0 \n"
232 /* get devfn into %ecx */
233 " movl %esp, %ebp \n"
235 /* I'm not happy about that pushal followed by esp-relative references.
236 * just do hard-codes for now
238 " movl 8(%ebp), %ecx \n"
239 " movl 12(%ebp), %edx \n"
241 " movl $0x10000026, %ecx \n"
242 " movl $0x10000028, %edx \n"
245 " lgdt %cs:__mygdtaddr \n"
247 /* This configures CS properly for real mode. */
248 " ljmp $0x28, $__rms_16bit\n"
251 /* 16 bit code from here on... */
253 /* Load the segment registers w/ properly configured segment
254 * descriptors. They will retain these configurations (limits,
255 * writability, etc.) once protected mode is turned off. */
263 /* Turn off protection (bit 0 in CR0) */
264 " movl %cr0, %eax \n"
265 " andl $0xFFFFFFFE, %eax \n"
266 " movl %eax, %cr0 \n"
268 /* Now really going into real mode */
269 " ljmp $0, $__rms_real\n"
272 /* put the stack at the end of page zero.
273 * that way we can easily share it between real and protected,
274 * since the 16-bit ESP at segment 0 will work for any case. */
278 " movl $0x1000, %eax \n"
279 " movl %eax, %esp \n"
281 /* Load our 16 it idt */
286 /* Dump zeros in the other segregs */
288 /* FixMe: Big real mode for gs, fs? */
294 " movl $0x10000026, %ecx \n"
295 " movl $0x10000028, %edx \n"
297 /* run VGA BIOS at 0x6000:0020 */
298 " lcall $0x6000, $0x0020\n"
300 /* if we got here, just about done.
301 * Need to get back to protected mode */
302 " movl %cr0, %eax \n"
303 " orl $0x0000001, %eax\n" /* PE = 1 */
304 " movl %eax, %cr0 \n"
306 /* Now that we are in protected mode jump to a 32 bit code segment. */
307 " data32 ljmp $0x10, $vsmrestart\n"
310 " movw $0x18, %ax \n"
317 /* restore proper gdt and idt */
318 " lgdt %cs:gdtarg \n"
323 " mov __stack, %esp \n"
328 __asm__ (".text\n""real_mode_switch_end:\n");
329 extern char real_mode_switch_end[];
332 void do_vsmbios(void)
335 unsigned long busdevfn;
336 unsigned int rom = 0;
338 unsigned int size = 256*1024;
341 printk_err("do_vsmbios\n");
342 /* clear vsm bios data area */
343 for (i = 0x400; i < 0x500; i++) {
344 *(unsigned char *) i = 0;
347 /* declare rom address here - keep any config data out of the way
348 * of core LXB stuff */
350 /* this is the base of rom on the GX2 at present. At some point, this has to be
351 * much better parameterized
355 /* the VSA starts at the base of rom - 64 */
356 rom = ((unsigned long) 0) - (ROM_SIZE + 64*1024);
358 buf = (unsigned char *) 0x60000;
359 unrv2b((uint8_t *)rom, buf);
360 printk_debug("buf %p *buf %d buf[256k] %d\n",
361 buf, buf[0], buf[256*1024]);
362 printk_debug("buf[0x20] signature is %x:%x:%x:%x\n",
363 buf[0x20] ,buf[0x21] ,buf[0x22],buf[0x23]);
364 /* check for post code at start of vsainit.bin. If you don't see it,
366 if ((buf[0x20] != 0xb0) || (buf[0x21] != 0x10) ||
367 (buf[0x22] != 0xe6) || (buf[0x23] != 0x80)) {
368 printk_err("do_vsmbios: no vsainit.bin signature, skipping!\n");
372 //memcpy((void *) 0x60000, buf, size);
374 //for (i = 0; i < 0x800000; i++)
377 /* ecx gets smm, edx gets sysm */
378 printk_err("Call real_mode_switch_call_vsm\n");
379 real_mode_switch_call_vsm(0x10000026, 0x10000028);
381 /* restart timer 1 */
387 // we had hoped to avoid this.
388 // this is a stub IDT only. It's main purpose is to ignore calls
390 // no longer. Dammit. We have to respond to these.
392 unsigned short offset, cs;
395 // from a handy writeup that andrey found.
398 // There are some assumptions we can make here.
399 // First, the Top Of Stack (TOS) is located on the top of page zero.
400 // we can share this stack between real and protected mode.
401 // that simplifies a lot of things ...
402 // we'll just push all the registers on the stack as longwords,
403 // and pop to protected mode.
404 // second, since this only ever runs as part of linuxbios,
405 // we know all the segment register values -- so we don't save any.
406 // keep the handler that calls things small. It can do a call to
407 // more complex code in linuxbios itself. This helps a lot as we don't
408 // have to do address fixup in this little stub, and calls are absolute
409 // so the handler is relocatable.
412 __asm__ __volatile__ (
417 " ljmp $0, $callbiosint16\n"
423 void debughandler(void)
425 __asm__ __volatile__ (
434 "end_debughandle: \n"
439 // Calling conventions. The first C function is called with this stuff
440 // on the stack. They look like value parameters, but note that if you
441 // modify them they will go back to the INTx function modified.
442 // the C function will call the biosint function with these as
443 // REFERENCE parameters. In this way, we can easily get
444 // returns back to the INTx caller (i.e. vgabios)
445 void callbiosint(void)
447 __asm__ __volatile__ (
454 // clean up the int #. To save space we put it in the lower
455 // byte. But the top 24 bits are junk.
456 " andl $0xff, %eax\n"
457 // this push does two things:
458 // - put the INT # on the stack as a parameter
459 // - provides us with a temp for the %cr0 mods.
464 " orl $0x00000001, %eax\n" /* PE = 1 */
466 /* Now that we are in protected mode jump to a 32 bit code segment. */
467 " data32 ljmp $0x10, $biosprotect\n"
470 " movw $0x18, %ax \n"
478 // back to real mode ...
479 " ljmp $0x28, $__rms_16bit2\n"
482 /* 16 bit code from here on... */
483 /* Load the segment registers w/ properly configured segment
484 * descriptors. They will retain these configurations (limits,
485 * writability, etc.) once protected mode is turned off. */
493 /* Turn off protection (bit 0 in CR0) */
494 " movl %cr0, %eax \n"
495 " andl $0xFFFFFFFE, %eax \n"
496 " movl %eax, %cr0 \n"
498 /* Now really going into real mode */
499 " ljmp $0, $__rms_real2 \n"
503 * FixME: where is esp? */
504 /* no need for a fix here. The esp is shared from 32-bit and 16-bit mode.
505 * you have to hack on the ss, but the esp remains the same across
511 /* debugging for RGM */
513 " outb %al, $0x80 \n"
515 /* Load our 16 bit idt */
520 /* Dump zeros in the other segregs */
527 /* pop the INT # that you pushed earlier */
544 int pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
545 unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
546 unsigned long *pecx, unsigned long *peax, unsigned long *pflags);
548 int handleint21(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
549 unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
550 unsigned long *pecx, unsigned long *peax, unsigned long *pflags
553 int biosint(unsigned long intnumber,
554 unsigned long gsfs, unsigned long dses,
555 unsigned long edi, unsigned long esi,
556 unsigned long ebp, unsigned long esp,
557 unsigned long ebx, unsigned long edx,
558 unsigned long ecx, unsigned long eax,
559 unsigned long cs_ip, unsigned short stackflags)
570 printk_debug("biosint: INT# 0x%lx\n", intnumber);
571 printk_debug("biosint: eax 0x%lx ebx 0x%lx ecx 0x%lx edx 0x%lx\n",
573 printk_debug("biosint: ebp 0x%lx esp 0x%lx edi 0x%lx esi 0x%lx\n",
575 printk_debug("biosint: ip 0x%x cs 0x%x flags 0x%x\n",
577 printk_debug("biosint: gs 0x%x fs 0x%x ds 0x%x es 0x%x\n",
578 gsfs >> 16, gsfs & 0xffff, dses >> 16, dses & 0xffff);
580 // cases in a good compiler are just as good as your own tables.
583 // These are not BIOS service, but the CPU-generated exceptions
584 printk_info("biosint: Oops, exception %u\n", intnumber);
586 printk_debug("Stack contents: ");
587 while (esp < 0x1000) {
588 printk_debug("0x%04x ", *(unsigned short *) esp);
593 printk_debug("biosint: Bailing out ... not now\n");
599 ret = pcibios( &edi, &esi, &ebp, &esp,
600 &ebx, &edx, &ecx, &eax, &flags);
608 ret=handleint21( &edi, &esi, &ebp, &esp,
609 &ebx, &edx, &ecx, &eax, &flags);
612 printk_info("BIOSINT: Unsupport int #0x%x\n",
617 flags |= 1; // carry flags
625 void setup_realmode_idt(void)
627 extern unsigned char idthandle, end_idthandle;
628 extern unsigned char debughandle, end_debughandle;
631 struct realidt *idts = (struct realidt *) 0;
632 int codesize = &end_idthandle - &idthandle;
633 unsigned char *intbyte, *codeptr;
635 // for each int, we create a customized little handler
636 // that just pushes %ax, puts the int # in %al,
637 // then calls the common interrupt handler.
638 // this necessitated because intel didn't know much about
639 // architecture when they did the 8086 (it shows)
640 // (hmm do they know anymore even now :-)
641 // obviously you can see I don't really care about memory
642 // efficiency. If I did I would probe back through the stack
643 // and get it that way. But that's really disgusting.
644 for (i = 0; i < 256; i++) {
646 codeptr = (char*) 4096 + i * codesize;
647 idts[i].offset = (unsigned) codeptr;
648 memcpy(codeptr, &idthandle, codesize);
649 intbyte = codeptr + 3;
653 // fixed entry points
655 // VGA BIOSes tend to hardcode f000:f065 as the previous handler of
657 // calling convention here is the same as INTs, we can reuse
658 // the int entry code.
659 codeptr = (char*) 0xff065;
660 memcpy(codeptr, &idthandle, codesize);
661 intbyte = codeptr + 3;
662 *intbyte = 0x42; /* int42 is the relocated int10 */
664 /* debug handler - useful to set a programmable delay between instructions if the
665 TF bit is set upon call to real mode */
667 idts[1].offset = 16384;
668 memcpy(16384, &debughandle, &end_debughandle - &debughandle);
676 READCONFBYTE = 0xb108,
677 READCONFWORD = 0xb109,
678 READCONFDWORD = 0xb10a,
679 WRITECONFBYTE = 0xb10b,
680 WRITECONFWORD = 0xb10c,
681 WRITECONFDWORD = 0xb10d
684 // errors go in AH. Just set these up so that word assigns
687 PCIBIOS_NODEV = 0x8600,
688 PCIBIOS_BADREG = 0x8700
692 pcibios(unsigned long *pedi, unsigned long *pesi, unsigned long *pebp,
693 unsigned long *pesp, unsigned long *pebx, unsigned long *pedx,
694 unsigned long *pecx, unsigned long *peax, unsigned long *pflags)
696 unsigned long edi = *pedi;
697 unsigned long esi = *pesi;
698 unsigned long ebp = *pebp;
699 unsigned long esp = *pesp;
700 unsigned long ebx = *pebx;
701 unsigned long edx = *pedx;
702 unsigned long ecx = *pecx;
703 unsigned long eax = *peax;
704 unsigned long flags = *pflags;
705 unsigned short func = (unsigned short) eax;
707 unsigned short devid, vendorid, devfn;
708 short devindex; /* Use short to get rid of gabage in upper half of 32-bit register */
724 while ((dev = dev_find_device(vendorid, devid, dev))) {
730 unsigned short busdevfn;
732 // busnum is an unsigned char;
733 // devfn is an int, so we mask it off.
734 busdevfn = (dev->bus->secondary << 8)
735 | (dev->path.u.pci.devfn & 0xff);
736 printk_debug("0x%x: return 0x%x\n", func, busdevfn);
740 *peax = PCIBIOS_NODEV;
757 devfn = *pebx & 0xff;
760 dev = dev_find_slot(bus, devfn);
762 printk_debug("0x%x: BAD DEVICE bus %d devfn 0x%x\n", func, bus, devfn);
763 // idiots. the pcibios guys assumed you'd never pass a bad bus/devfn!
764 *peax = PCIBIOS_BADREG;
769 byte = pci_read_config8(dev, reg);
773 word = pci_read_config16(dev, reg);
777 dword = pci_read_config32(dev, reg);
782 pci_write_config8(dev, reg, byte);
786 pci_write_config16(dev, reg, word);
790 pci_write_config32(dev, reg, dword);
795 retval = PCIBIOS_BADREG;
796 printk_debug("0x%x: bus %d devfn 0x%x reg 0x%x val 0x%lx\n",
797 func, bus, devfn, reg, *pecx);
803 printk_err("UNSUPPORTED PCIBIOS FUNCTION 0x%x\n", func);
810 int handleint21(unsigned long *edi, unsigned long *esi, unsigned long *ebp,
811 unsigned long *esp, unsigned long *ebx, unsigned long *edx,
812 unsigned long *ecx, unsigned long *eax, unsigned long *flags)
815 printk_debug("handleint21, eax 0x%x\n", *eax);
822 *ebx=0x545; // MCLK = 133, 32M frame buffer, 256 M main memory
831 *ecx = (*ecx & 0xffffff00 ) | 2; // panel type = 2 = 1024 * 768
836 *ebx= (*ebx & 0xffff0000) | 2;
837 *ecx= (*ecx & 0xffff0000) | 0x401; // PAL + crt only
838 *edx= (*edx & 0xffff0000) | 0; // TV Layout - default