/*- * Copyright (c) 1997 Michael Smith * Copyright (c) 1998 Jonathan Lemon * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $Id: bios.c,v 1.16 1999/08/17 07:10:29 msmith Exp $ */ /* * Code for dealing with the BIOS in x86 PC systems. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define BIOS_START 0xe0000 #define BIOS_SIZE 0x20000 /* exported lookup results */ struct bios32_SDentry PCIbios = {entry : 0}; struct PnPBIOS_table *PnPBIOStable = 0; static u_int bios32_SDCI = 0; /* start fairly early */ static void bios32_init(void *junk); SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL); static void pnpbios_scan(void); static char *pnp_eisaformat(u_int8_t *data); /* * bios32_init * * Locate various bios32 entities. */ static void bios32_init(void *junk) { u_long sigaddr; struct bios32_SDheader *sdh; struct PnPBIOS_table *pt; u_int8_t ck, *cv; int i; /* * BIOS32 Service Directory */ /* look for the signature */ if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) { /* get a virtual pointer to the structure */ sdh = (struct bios32_SDheader *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) { ck += cv[i]; } /* If checksum is OK, enable use of the entrypoint */ if ((ck == 0) && (sdh->entry < (BIOS_START + BIOS_SIZE))) { bios32_SDCI = BIOS_PADDRTOVADDR(sdh->entry); if (bootverbose) { printf("bios32: Found BIOS32 Service Directory header at %p\n", sdh); printf("bios32: Entry = 0x%x (%x) Rev = %d Len = %d\n", sdh->entry, bios32_SDCI, sdh->revision, sdh->len); } /* See if there's a PCI BIOS entrypoint here */ PCIbios.ident.id = 0x49435024; /* PCI systems should have this */ if (!bios32_SDlookup(&PCIbios) && bootverbose) printf("pcibios: PCI BIOS entry at 0x%x\n", PCIbios.entry); } else { printf("bios32: Bad BIOS32 Service Directory\n"); } } /* * PnP BIOS */ if ((sigaddr = bios_sigsearch(0, "$PnP", 4, 16, 0)) != 0) { /* get a virtual pointer to the structure */ pt = (struct PnPBIOS_table *)(uintptr_t)BIOS_PADDRTOVADDR(sigaddr); for (cv = (u_int8_t *)pt, ck = 0, i = 0; i < pt->len; i++) { ck += cv[i]; } /* If checksum is OK, enable use of the entrypoint */ if (ck == 0) { PnPBIOStable = pt; if (bootverbose) { printf("pnpbios: Found PnP BIOS data at %p\n", pt); printf("pnpbios: Entry = %x:%x Rev = %d.%d\n", pt->pmentrybase, pt->pmentryoffset, pt->version >> 4, pt->version & 0xf); if ((pt->control & 0x3) == 0x01) printf("pnpbios: Event flag at %x\n", pt->evflagaddr); if (pt->oemdevid != 0) printf("pnpbios: OEM ID %x\n", pt->oemdevid); } pnpbios_scan(); } else { printf("pnpbios: Bad PnP BIOS data checksum\n"); } } if (bootverbose) { /* look for other know signatures */ printf("Other BIOS signatures found:\n"); printf("ACPI: %08x\n", bios_sigsearch(0, "RST PTR", 8, 16, 0)); } } /* * bios32_SDlookup * * Query the BIOS32 Service Directory for the service named in (ent), * returns nonzero if the lookup fails. The caller must fill in * (ent->ident), the remainder are populated on a successful lookup. */ int bios32_SDlookup(struct bios32_SDentry *ent) { struct bios_regs args; if (bios32_SDCI == 0) return (1); args.eax = ent->ident.id; /* set up arguments */ args.ebx = args.ecx = args.edx = 0; bios32(&args, bios32_SDCI, GSEL(GCODE_SEL, SEL_KPL)); if ((args.eax & 0xff) == 0) { /* success? */ ent->base = args.ebx; ent->len = args.ecx; ent->entry = args.edx; return (0); /* all OK */ } return (1); /* failed */ } /* * bios_sigsearch * * Search some or all of the BIOS region for a signature string. * * (start) Optional offset returned from this function * (for searching for multiple matches), or NULL * to start the search from the base of the BIOS. * Note that this will be a _physical_ address in * the range 0xe0000 - 0xfffff. * (sig) is a pointer to the byte(s) of the signature. * (siglen) number of bytes in the signature. * (paralen) signature paragraph (alignment) size. * (sigofs) offset of the signature within the paragraph. * * Returns the _physical_ address of the found signature, 0 if the * signature was not found. */ u_int32_t bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs) { u_char *sp, *end; /* compute the starting address */ if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) { sp = (char *)BIOS_PADDRTOVADDR(start); } else if (start == 0) { sp = (char *)BIOS_PADDRTOVADDR(BIOS_START); } else { return 0; /* bogus start address */ } /* compute the end address */ end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE); /* loop searching */ while ((sp + sigofs + siglen) < end) { /* compare here */ if (!bcmp(sp + sigofs, sig, siglen)) { /* convert back to physical address */ return((u_int32_t)BIOS_VADDRTOPADDR(sp)); } sp += paralen; } return(0); } /* * do not staticize, used by bioscall.s */ union { struct { u_short offset; u_short segment; } vec16; struct { u_int offset; u_short segment; } vec32; } bioscall_vector; /* bios jump vector */ void set_bios_selectors(struct bios_segments *seg, int flags) { static u_int curgen = 1; struct soft_segment_descriptor ssd = { 0, /* segment base address (overwritten) */ 0, /* length (overwritten) */ SDT_MEMERA, /* segment type (overwritten) */ 0, /* priority level */ 1, /* descriptor present */ 0, 0, 1, /* descriptor size (overwritten) */ 0 /* granularity == byte units */ }; if (seg->generation == curgen) return; if (++curgen == 0) curgen = 1; seg->generation = curgen; ssd.ssd_base = seg->code32.base; ssd.ssd_limit = seg->code32.limit; ssdtosd(&ssd, &gdt[GBIOSCODE32_SEL].sd); ssd.ssd_def32 = 0; if (flags & BIOSCODE_FLAG) { ssd.ssd_base = seg->code16.base; ssd.ssd_limit = seg->code16.limit; ssdtosd(&ssd, &gdt[GBIOSCODE16_SEL].sd); } ssd.ssd_type = SDT_MEMRWA; if (flags & BIOSDATA_FLAG) { ssd.ssd_base = seg->data.base; ssd.ssd_limit = seg->data.limit; ssdtosd(&ssd, &gdt[GBIOSDATA_SEL].sd); } if (flags & BIOSUTIL_FLAG) { ssd.ssd_base = seg->util.base; ssd.ssd_limit = seg->util.limit; ssdtosd(&ssd, &gdt[GBIOSUTIL_SEL].sd); } if (flags & BIOSARGS_FLAG) { ssd.ssd_base = seg->args.base; ssd.ssd_limit = seg->args.limit; ssdtosd(&ssd, &gdt[GBIOSARGS_SEL].sd); } } /* * for pointers, we don't know how much space is supposed to be allocated, * so we assume a minimum size of 256 bytes. If more than this is needed, * then this can be revisited, such as adding a length specifier. */ #define ASSUMED_ARGSIZE 256 extern int vm86pa; /* * this routine is really greedy with selectors, and uses 5: * * 32-bit code selector: to return to kernel * 16-bit code selector: for running code * data selector: for 16-bit data * util selector: extra utility selector * args selector: to handle pointers * * the util selector is set from the util16 entry in bios16_args, if a * "U" specifier is seen. * * See for description of format specifiers */ int bios16(struct bios_args *args, char *fmt, ...) { char *p, *stack, *stack_top; va_list ap; int flags = BIOSCODE_FLAG | BIOSDATA_FLAG; u_int i, arg_start, arg_end; u_int *pte, *ptd; arg_start = 0xffffffff; arg_end = 0; stack = (caddr_t)PAGE_SIZE; va_start(ap, fmt); for (p = fmt; p && *p; p++) { switch (*p) { case 'p': /* 32-bit pointer */ i = va_arg(ap, u_int); arg_start = min(arg_start, i); arg_end = max(arg_end, i + ASSUMED_ARGSIZE); flags |= BIOSARGS_FLAG; stack -= 4; break; case 'i': /* 32-bit integer */ i = va_arg(ap, u_int); stack -= 4; break; case 'U': /* 16-bit selector */ flags |= BIOSUTIL_FLAG; /* FALLTHROUGH */ case 'D': /* 16-bit selector */ case 'C': /* 16-bit selector */ stack -= 2; break; case 's': /* 16-bit integer */ i = va_arg(ap, u_short); stack -= 2; break; default: return (EINVAL); } } if (flags & BIOSARGS_FLAG) { if (arg_end - arg_start > ctob(16)) return (EACCES); args->seg.args.base = arg_start; args->seg.args.limit = arg_end - arg_start; } args->seg.code32.base = (u_int)&bios16_call & PG_FRAME; args->seg.code32.limit = 0xffff; ptd = (u_int *)rcr3(); if (ptd == IdlePTD) { /* * no page table, so create one and install it. */ pte = (u_int *)malloc(PAGE_SIZE, M_TEMP, M_WAITOK); ptd = (u_int *)((u_int)ptd + KERNBASE); *ptd = vtophys(pte) | PG_RW | PG_V; } else { /* * this is a user-level page table */ pte = (u_int *)&PTmap; } /* * install pointer to page 0. we don't need to flush the tlb, * since there should not be a previous mapping for page 0. */ *pte = (vm86pa - PAGE_SIZE) | PG_RW | PG_V; stack_top = stack; va_start(ap, fmt); for (p = fmt; p && *p; p++) { switch (*p) { case 'p': /* 32-bit pointer */ i = va_arg(ap, u_int); *(u_int *)stack = (i - arg_start) | (GSEL(GBIOSARGS_SEL, SEL_KPL) << 16); stack += 4; break; case 'i': /* 32-bit integer */ i = va_arg(ap, u_int); *(u_int *)stack = i; stack += 4; break; case 'U': /* 16-bit selector */ *(u_short *)stack = GSEL(GBIOSUTIL_SEL, SEL_KPL); stack += 2; break; case 'D': /* 16-bit selector */ *(u_short *)stack = GSEL(GBIOSDATA_SEL, SEL_KPL); stack += 2; break; case 'C': /* 16-bit selector */ *(u_short *)stack = GSEL(GBIOSCODE16_SEL, SEL_KPL); stack += 2; break; case 's': /* 16-bit integer */ i = va_arg(ap, u_short); *(u_short *)stack = i; stack += 2; break; default: return (EINVAL); } } args->seg.generation = 0; /* reload selectors */ set_bios_selectors(&args->seg, flags); bioscall_vector.vec16.offset = (u_short)args->entry; bioscall_vector.vec16.segment = GSEL(GBIOSCODE16_SEL, SEL_KPL); i = bios16_call(&args->r, stack_top); if (pte == (u_int *)&PTmap) { *pte = 0; /* remove entry */ } else { *ptd = 0; /* remove page table */ free(pte, M_TEMP); /* ... and free it */ } /* * XXX only needs to be invlpg(0) but that doesn't work on the 386 */ invltlb(); return (i); } /* * PnP BIOS interface; enumerate devices only known to the system * BIOS and save information about them for later use. */ struct pnp_sysdev { u_int16_t size; u_int8_t handle; u_int32_t devid; u_int8_t type[3]; u_int16_t attrib; #define PNPATTR_NODISABLE (1<<0) /* can't be disabled */ #define PNPATTR_NOCONFIG (1<<1) /* can't be configured */ #define PNPATTR_OUTPUT (1<<2) /* can be primary output */ #define PNPATTR_INPUT (1<<3) /* can be primary input */ #define PNPATTR_BOOTABLE (1<<4) /* can be booted from */ #define PNPATTR_DOCK (1<<5) /* is a docking station */ #define PNPATTR_REMOVEABLE (1<<6) /* device is removeable */ #define PNPATTR_CONFIG_STATIC 0x00 #define PNPATTR_CONFIG_DYNAMIC 0x07 #define PNPATTR_CONFIG_DYNONLY 0x17 /* device-specific data comes here */ u_int8_t devdata[0]; } __attribute__ ((packed)); /* We have to cluster arguments within a 64k range for the bios16 call */ struct pnp_sysdevargs { u_int16_t next; struct pnp_sysdev node; }; /* * Quiz the PnP BIOS, build a list of PNP IDs and resource data. */ static void pnpbios_scan(void) { struct PnPBIOS_table *pt = PnPBIOStable; struct bios_args args; struct pnp_sysdev *pd; struct pnp_sysdevargs *pda; u_int16_t ndevs, bigdev; int error, currdev; u_int8_t *devnodebuf, tag; u_int32_t *devid, *compid; int idx, left; /* no PnP BIOS information */ if (pt == NULL) return; bzero(&args, sizeof(args)); args.seg.code16.base = BIOS_PADDRTOVADDR(pt->pmentrybase); args.seg.code16.limit = 0xffff; /* XXX ? */ args.seg.data.base = BIOS_PADDRTOVADDR(pt->pmdataseg); args.seg.data.limit = 0xffff; args.entry = pt->pmentryoffset; if ((error = bios16(&args, PNP_COUNT_DEVNODES, &ndevs, &bigdev)) || (args.r.eax & 0xff)) printf("pnpbios: error %d/%x getting device count/size limit\n", error, args.r.eax); if (bootverbose) printf("pnpbios: %d devices, largest %d bytes\n", ndevs, bigdev); devnodebuf = malloc(bigdev + (sizeof(struct pnp_sysdevargs) - sizeof(struct pnp_sysdev)), M_DEVBUF, M_NOWAIT); pda = (struct pnp_sysdevargs *)devnodebuf; pd = &pda->node; for (currdev = 0, left = ndevs; (currdev != 0xff) && (left > 0); left--) { bzero(pd, bigdev); pda->next = currdev; /* get current configuration */ if ((error = bios16(&args, PNP_GET_DEVNODE, &pda->next, &pda->node, (u_int16_t)1))) { printf("pnpbios: error %d making BIOS16 call\n", error); break; } if ((error = (args.r.eax & 0xff))) { if (bootverbose) printf("pnpbios: %s 0x%x fetching node %d\n", error & 0x80 ? "error" : "warning", error, currdev); if (error & 0x80) break; } currdev = pda->next; if (pd->size < sizeof(struct pnp_sysdev)) { printf("pnpbios: bogus system node data, aborting scan\n"); break; } /* Find device IDs */ devid = &pd->devid; compid = NULL; /* look for a compatible device ID too */ left = pd->size - sizeof(struct pnp_sysdev); idx = 0; while (idx < left) { tag = pd->devdata[idx++]; if (PNP_RES_TYPE(tag) == 0) { /* Small resource */ switch (PNP_SRES_NUM(tag)) { case COMP_DEVICE_ID: compid = (u_int32_t *)(pd->devdata + idx); if (bootverbose) printf("pnpbios: node %d compat ID 0x%08x\n", pd->handle, *compid); /* FALLTHROUGH */ case END_TAG: idx = left; break; default: idx += PNP_SRES_LEN(tag); break; } } else /* Large resource, skip it */ idx += *(u_int16_t *)(pd->devdata + idx) + 2; } if (bootverbose) { printf("pnpbios: handle %d device ID %s (%08x)", pd->handle, pnp_eisaformat((u_int8_t *)devid), *devid); if (compid != NULL) printf(" compat ID %s (%08x)", pnp_eisaformat((u_int8_t *)compid), *compid); printf("\n"); } } } /* XXX should be somewhere else */ static char * pnp_eisaformat(u_int8_t *data) { static char idbuf[8]; const char hextoascii[] = "0123456789abcdef"; idbuf[0] = '@' + ((data[0] & 0x7c) >> 2); idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5)); idbuf[2] = '@' + (data[1] & 0x1f); idbuf[3] = hextoascii[(data[2] >> 4)]; idbuf[4] = hextoascii[(data[2] & 0xf)]; idbuf[5] = hextoascii[(data[3] >> 4)]; idbuf[6] = hextoascii[(data[3] & 0xf)]; idbuf[7] = 0; return(idbuf); }