2 * Copyright (c) 2009 Alex Keda <admin@lissyara.su>
3 * Copyright (c) 2009-2010 Jung-uk Kim <jkim@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
31 #include "opt_x86bios.h"
33 #include <sys/param.h>
35 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
39 #include <sys/mutex.h>
41 #include <sys/sysctl.h>
43 #include <contrib/x86emu/x86emu.h>
44 #include <contrib/x86emu/x86emu_regs.h>
45 #include <compat/x86bios/x86bios.h>
47 #include <dev/pci/pcireg.h>
48 #include <dev/pci/pcivar.h>
50 #include <machine/cpufunc.h>
55 #define X86BIOS_PAGE_SIZE 0x00001000 /* 4K */
57 #define X86BIOS_IVT_SIZE 0x00000500 /* 1K + 256 (BDA) */
58 #define X86BIOS_SEG_SIZE 0x00010000 /* 64K */
59 #define X86BIOS_MEM_SIZE 0x00100000 /* 1M */
61 #define X86BIOS_IVT_BASE 0x00000000
62 #define X86BIOS_RAM_BASE 0x00001000
63 #define X86BIOS_ROM_BASE 0x000a0000
65 #define X86BIOS_ROM_SIZE (X86BIOS_MEM_SIZE - (uint32_t)x86bios_rom_phys)
67 #define X86BIOS_PAGES (X86BIOS_MEM_SIZE / X86BIOS_PAGE_SIZE)
69 #define X86BIOS_R_DS _pad1
70 #define X86BIOS_R_SS _pad2
72 static struct x86emu x86bios_emu;
74 static struct mtx x86bios_lock;
76 static void *x86bios_ivt;
77 static void *x86bios_rom;
78 static void *x86bios_seg;
80 static vm_offset_t *x86bios_map;
82 static vm_paddr_t x86bios_rom_phys;
83 static vm_paddr_t x86bios_seg_phys;
85 static int x86bios_fault;
86 static uint32_t x86bios_fault_addr;
87 static uint16_t x86bios_fault_cs;
88 static uint16_t x86bios_fault_ip;
90 SYSCTL_NODE(_debug, OID_AUTO, x86bios, CTLFLAG_RD, NULL, "x86bios debugging");
91 static int x86bios_trace_call;
92 TUNABLE_INT("debug.x86bios.call", &x86bios_trace_call);
93 SYSCTL_INT(_debug_x86bios, OID_AUTO, call, CTLFLAG_RW, &x86bios_trace_call, 0,
94 "Trace far function calls");
95 static int x86bios_trace_int;
96 TUNABLE_INT("debug.x86bios.int", &x86bios_trace_int);
97 SYSCTL_INT(_debug_x86bios, OID_AUTO, int, CTLFLAG_RW, &x86bios_trace_int, 0,
98 "Trace software interrupt handlers");
101 x86bios_set_fault(struct x86emu *emu, uint32_t addr)
105 x86bios_fault_addr = addr;
106 x86bios_fault_cs = emu->x86.R_CS;
107 x86bios_fault_ip = emu->x86.R_IP;
108 x86emu_halt_sys(emu);
112 x86bios_get_pages(uint32_t offset, size_t size)
116 if (offset + size > X86BIOS_MEM_SIZE + X86BIOS_IVT_SIZE)
119 if (offset >= X86BIOS_MEM_SIZE)
120 offset -= X86BIOS_MEM_SIZE;
121 page = x86bios_map[offset / X86BIOS_PAGE_SIZE];
123 return ((void *)(page + offset % X86BIOS_PAGE_SIZE));
129 x86bios_set_pages(vm_offset_t va, vm_paddr_t pa, size_t size)
133 for (i = pa / X86BIOS_PAGE_SIZE, j = 0;
134 j < howmany(size, X86BIOS_PAGE_SIZE); i++, j++)
135 x86bios_map[i] = va + j * X86BIOS_PAGE_SIZE;
139 x86bios_emu_rdb(struct x86emu *emu, uint32_t addr)
143 va = x86bios_get_pages(addr, sizeof(*va));
145 x86bios_set_fault(emu, addr);
151 x86bios_emu_rdw(struct x86emu *emu, uint32_t addr)
155 va = x86bios_get_pages(addr, sizeof(*va));
157 x86bios_set_fault(emu, addr);
159 #ifndef __NO_STRICT_ALIGNMENT
161 return (le16dec(va));
164 return (le16toh(*va));
168 x86bios_emu_rdl(struct x86emu *emu, uint32_t addr)
172 va = x86bios_get_pages(addr, sizeof(*va));
174 x86bios_set_fault(emu, addr);
176 #ifndef __NO_STRICT_ALIGNMENT
178 return (le32dec(va));
181 return (le32toh(*va));
185 x86bios_emu_wrb(struct x86emu *emu, uint32_t addr, uint8_t val)
189 va = x86bios_get_pages(addr, sizeof(*va));
191 x86bios_set_fault(emu, addr);
197 x86bios_emu_wrw(struct x86emu *emu, uint32_t addr, uint16_t val)
201 va = x86bios_get_pages(addr, sizeof(*va));
203 x86bios_set_fault(emu, addr);
205 #ifndef __NO_STRICT_ALIGNMENT
214 x86bios_emu_wrl(struct x86emu *emu, uint32_t addr, uint32_t val)
218 va = x86bios_get_pages(addr, sizeof(*va));
220 x86bios_set_fault(emu, addr);
222 #ifndef __NO_STRICT_ALIGNMENT
231 x86bios_emu_inb(struct x86emu *emu, uint16_t port)
234 if (port == 0xb2) /* APM scratch register */
236 if (port >= 0x80 && port < 0x88) /* POST status register */
243 x86bios_emu_inw(struct x86emu *emu, uint16_t port)
246 if (port >= 0x80 && port < 0x88) /* POST status register */
253 x86bios_emu_inl(struct x86emu *emu, uint16_t port)
256 if (port >= 0x80 && port < 0x88) /* POST status register */
263 x86bios_emu_outb(struct x86emu *emu, uint16_t port, uint8_t val)
266 if (port == 0xb2) /* APM scratch register */
268 if (port >= 0x80 && port < 0x88) /* POST status register */
275 x86bios_emu_outw(struct x86emu *emu, uint16_t port, uint16_t val)
278 if (port >= 0x80 && port < 0x88) /* POST status register */
285 x86bios_emu_outl(struct x86emu *emu, uint16_t port, uint32_t val)
288 if (port >= 0x80 && port < 0x88) /* POST status register */
295 x86bios_emu_get_intr(struct x86emu *emu, int intno)
302 sp = (uint16_t *)((vm_offset_t)x86bios_seg + emu->x86.R_SP);
303 sp[0] = htole16(emu->x86.R_IP);
304 sp[1] = htole16(emu->x86.R_CS);
305 sp[2] = htole16(emu->x86.R_FLG);
307 iv = x86bios_get_intr(intno);
308 emu->x86.R_IP = iv & 0xffff;
309 emu->x86.R_CS = (iv >> 16) & 0xffff;
310 emu->x86.R_FLG &= ~(F_IF | F_TF);
314 x86bios_alloc(uint32_t *offset, size_t size)
318 if (offset == NULL || size == 0)
321 vaddr = contigmalloc(size, M_DEVBUF, M_NOWAIT, X86BIOS_RAM_BASE,
322 x86bios_rom_phys, X86BIOS_PAGE_SIZE, 0);
324 *offset = vtophys(vaddr);
325 x86bios_set_pages((vm_offset_t)vaddr, *offset, size);
332 x86bios_free(void *addr, size_t size)
336 if (addr == NULL || size == 0)
339 paddr = vtophys(addr);
340 if (paddr < X86BIOS_RAM_BASE || paddr >= x86bios_rom_phys ||
341 paddr % X86BIOS_PAGE_SIZE != 0)
344 bzero(x86bios_map + paddr / X86BIOS_PAGE_SIZE,
345 sizeof(*x86bios_map) * howmany(size, X86BIOS_PAGE_SIZE));
346 contigfree(addr, size, M_DEVBUF);
350 x86bios_init_regs(struct x86regs *regs)
353 bzero(regs, sizeof(*regs));
354 regs->X86BIOS_R_DS = 0x40;
355 regs->X86BIOS_R_SS = x86bios_seg_phys >> 4;
359 x86bios_call(struct x86regs *regs, uint16_t seg, uint16_t off)
362 if (x86bios_map == NULL)
365 if (x86bios_trace_call)
366 printf("Calling 0x%05x (ax=0x%04x bx=0x%04x "
367 "cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
368 (seg << 4) + off, regs->R_AX, regs->R_BX, regs->R_CX,
369 regs->R_DX, regs->R_ES, regs->R_DI);
371 mtx_lock_spin(&x86bios_lock);
372 memcpy(&x86bios_emu.x86, regs, sizeof(*regs));
374 x86emu_exec_call(&x86bios_emu, seg, off);
375 memcpy(regs, &x86bios_emu.x86, sizeof(*regs));
376 mtx_unlock_spin(&x86bios_lock);
378 if (x86bios_trace_call) {
379 printf("Exiting 0x%05x (ax=0x%04x bx=0x%04x "
380 "cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
381 (seg << 4) + off, regs->R_AX, regs->R_BX, regs->R_CX,
382 regs->R_DX, regs->R_ES, regs->R_DI);
384 printf("Page fault at 0x%05x from 0x%04x:0x%04x.\n",
385 x86bios_fault_addr, x86bios_fault_cs,
391 x86bios_get_intr(int intno)
395 iv = (uint32_t *)((vm_offset_t)x86bios_ivt + intno * 4);
397 return (le32toh(*iv));
401 x86bios_intr(struct x86regs *regs, int intno)
404 if (intno < 0 || intno > 255)
407 if (x86bios_map == NULL)
410 if (x86bios_trace_int)
411 printf("Calling int 0x%x (ax=0x%04x bx=0x%04x "
412 "cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
413 intno, regs->R_AX, regs->R_BX, regs->R_CX,
414 regs->R_DX, regs->R_ES, regs->R_DI);
416 mtx_lock_spin(&x86bios_lock);
417 memcpy(&x86bios_emu.x86, regs, sizeof(*regs));
419 x86emu_exec_intr(&x86bios_emu, intno);
420 memcpy(regs, &x86bios_emu.x86, sizeof(*regs));
421 mtx_unlock_spin(&x86bios_lock);
423 if (x86bios_trace_int) {
424 printf("Exiting int 0x%x (ax=0x%04x bx=0x%04x "
425 "cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
426 intno, regs->R_AX, regs->R_BX, regs->R_CX,
427 regs->R_DX, regs->R_ES, regs->R_DI);
429 printf("Page fault at 0x%05x from 0x%04x:0x%04x.\n",
430 x86bios_fault_addr, x86bios_fault_cs,
436 x86bios_offset(uint32_t offset)
439 return (x86bios_get_pages(offset, 1));
443 x86bios_get_orm(uint32_t offset)
447 /* Does the shadow ROM contain BIOS POST code for x86? */
448 p = x86bios_offset(offset);
449 if (p == NULL || p[0] != 0x55 || p[1] != 0xaa || p[3] != 0xe9)
456 x86bios_match_device(uint32_t offset, device_t dev)
459 uint16_t device, vendor;
460 uint8_t class, progif, subclass;
462 /* Does the shadow ROM contain BIOS POST code for x86? */
463 p = x86bios_get_orm(offset);
467 /* Does it contain PCI data structure? */
468 p += le16toh(*(uint16_t *)(p + 0x18));
469 if (bcmp(p, "PCIR", 4) != 0 ||
470 le16toh(*(uint16_t *)(p + 0x0a)) < 0x18 || *(p + 0x14) != 0)
473 /* Does it match the vendor, device, and classcode? */
474 vendor = le16toh(*(uint16_t *)(p + 0x04));
475 device = le16toh(*(uint16_t *)(p + 0x06));
476 progif = *(p + 0x0d);
477 subclass = *(p + 0x0e);
479 if (vendor != pci_get_vendor(dev) || device != pci_get_device(dev) ||
480 class != pci_get_class(dev) || subclass != pci_get_subclass(dev) ||
481 progif != pci_get_progif(dev))
487 #if defined(__amd64__) || (defined(__i386__) && !defined(PC98))
494 x86bios_map_mem(void)
497 x86bios_ivt = pmap_mapbios(X86BIOS_IVT_BASE, X86BIOS_IVT_SIZE);
498 if (x86bios_ivt == NULL)
502 /* Probe EBDA via BDA. */
503 x86bios_rom_phys = *(uint16_t *)((vm_offset_t)x86bios_ivt + 0x40e);
504 x86bios_rom_phys = le16toh(x86bios_rom_phys) << 4;
505 if (x86bios_rom_phys != 0 && x86bios_rom_phys < X86BIOS_ROM_BASE &&
506 X86BIOS_ROM_BASE - x86bios_rom_phys <= 128 * 1024)
508 rounddown(x86bios_rom_phys, X86BIOS_PAGE_SIZE);
511 x86bios_rom_phys = X86BIOS_ROM_BASE;
512 x86bios_rom = pmap_mapdev(x86bios_rom_phys, X86BIOS_ROM_SIZE);
513 if (x86bios_rom == NULL) {
514 pmap_unmapdev((vm_offset_t)x86bios_ivt, X86BIOS_IVT_SIZE);
518 /* Change attribute for EBDA. */
519 if (x86bios_rom_phys < X86BIOS_ROM_BASE &&
520 pmap_change_attr((vm_offset_t)x86bios_rom,
521 X86BIOS_ROM_BASE - x86bios_rom_phys, PAT_WRITE_BACK) != 0) {
522 pmap_unmapdev((vm_offset_t)x86bios_ivt, X86BIOS_IVT_SIZE);
523 pmap_unmapdev((vm_offset_t)x86bios_rom, X86BIOS_ROM_SIZE);
528 x86bios_seg = contigmalloc(X86BIOS_SEG_SIZE, M_DEVBUF, M_WAITOK,
529 X86BIOS_RAM_BASE, x86bios_rom_phys, X86BIOS_PAGE_SIZE, 0);
530 x86bios_seg_phys = vtophys(x86bios_seg);
533 printf("x86bios: IVT 0x%06x-0x%06x at %p\n",
534 X86BIOS_IVT_BASE, X86BIOS_IVT_SIZE + X86BIOS_IVT_BASE - 1,
536 printf("x86bios: SSEG 0x%06x-0x%06x at %p\n",
537 (uint32_t)x86bios_seg_phys,
538 X86BIOS_SEG_SIZE + (uint32_t)x86bios_seg_phys - 1,
541 if (x86bios_rom_phys < X86BIOS_ROM_BASE)
542 printf("x86bios: EBDA 0x%06x-0x%06x at %p\n",
543 (uint32_t)x86bios_rom_phys, X86BIOS_ROM_BASE - 1,
546 printf("x86bios: ROM 0x%06x-0x%06x at %p\n",
547 X86BIOS_ROM_BASE, X86BIOS_MEM_SIZE - X86BIOS_SEG_SIZE - 1,
548 (void *)((vm_offset_t)x86bios_rom + X86BIOS_ROM_BASE -
549 (vm_offset_t)x86bios_rom_phys));
558 x86bios_unmap_mem(void)
561 pmap_unmapdev((vm_offset_t)x86bios_ivt, X86BIOS_IVT_SIZE);
562 pmap_unmapdev((vm_offset_t)x86bios_rom, X86BIOS_ROM_SIZE);
563 contigfree(x86bios_seg, X86BIOS_SEG_SIZE, M_DEVBUF);
567 x86bios_init(void *arg __unused)
571 mtx_init(&x86bios_lock, "x86bios lock", NULL, MTX_SPIN);
573 if (x86bios_map_mem() != 0)
576 x86bios_map = malloc(sizeof(*x86bios_map) * X86BIOS_PAGES, M_DEVBUF,
578 x86bios_set_pages((vm_offset_t)x86bios_ivt, X86BIOS_IVT_BASE,
580 x86bios_set_pages((vm_offset_t)x86bios_rom, x86bios_rom_phys,
582 x86bios_set_pages((vm_offset_t)x86bios_seg, x86bios_seg_phys,
585 bzero(&x86bios_emu, sizeof(x86bios_emu));
587 x86bios_emu.emu_rdb = x86bios_emu_rdb;
588 x86bios_emu.emu_rdw = x86bios_emu_rdw;
589 x86bios_emu.emu_rdl = x86bios_emu_rdl;
590 x86bios_emu.emu_wrb = x86bios_emu_wrb;
591 x86bios_emu.emu_wrw = x86bios_emu_wrw;
592 x86bios_emu.emu_wrl = x86bios_emu_wrl;
594 x86bios_emu.emu_inb = x86bios_emu_inb;
595 x86bios_emu.emu_inw = x86bios_emu_inw;
596 x86bios_emu.emu_inl = x86bios_emu_inl;
597 x86bios_emu.emu_outb = x86bios_emu_outb;
598 x86bios_emu.emu_outw = x86bios_emu_outw;
599 x86bios_emu.emu_outl = x86bios_emu_outl;
601 for (i = 0; i < 256; i++)
602 x86bios_emu._x86emu_intrTab[i] = x86bios_emu_get_intr;
606 x86bios_uninit(void *arg __unused)
608 vm_offset_t *map = x86bios_map;
610 mtx_lock_spin(&x86bios_lock);
611 if (x86bios_map != NULL) {
612 free(x86bios_map, M_DEVBUF);
615 mtx_unlock_spin(&x86bios_lock);
620 mtx_destroy(&x86bios_lock);
624 x86bios_modevent(module_t mod __unused, int type, void *data __unused)
632 x86bios_uninit(NULL);
641 static moduledata_t x86bios_mod = {
647 DECLARE_MODULE(x86bios, x86bios_mod, SI_SUB_CPU, SI_ORDER_ANY);
648 MODULE_VERSION(x86bios, 1);