/* * boot driver for BIOS devices with partitions * devbios must be called first */ #include "u.h" #include "lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "ureg.h" #include "error.h" #include "sd.h" #include "fs.h" long biosread(Fs *, void *, long); vlong biosseek(Fs *fs, vlong off); extern SDifc sdbiosifc; extern int onlybios0, biosinited; int biosverify(SDunit* ) { if (onlybios0 || !biosinited) return 0; return 1; } int biosonline(SDunit* unit) { if (onlybios0 || !biosinited || !unit) return 0; unit->sectors = 1UL << 30; /* a bunch */ unit->secsize = 512; /* conventional */ return 1; } static int biosrio(SDreq* r) { int nb; long got; vlong len, off; uchar *p; Fs fs; /* just for fs->dev, which is zero */ if (onlybios0 || !biosinited) return SDeio; /* * Most SCSI commands can be passed unchanged except for * the padding on the end. The few which require munging * are not used internally. Mode select/sense(6) could be * converted to the 10-byte form but it's not worth the * effort. Read/write(6) are easy. */ r->rlen = 0; r->status = SDok; switch(r->cmd[0]){ case 0x08: /* read */ case 0x28: /* read */ if (r->cmd[0] == 0x08) panic("biosrio: 0x08 read op\n"); off = r->cmd[2]<<24 | r->cmd[3]<<16 | r->cmd[4]<<8 | r->cmd[5]; nb = r->cmd[7]<<8 | r->cmd[8]; /* often 4 */ USED(nb); /* is nb*512 == r->dlen? */ memset(&fs, 0, sizeof fs); biosseek(&fs, off*512); got = biosread(&fs, r->data, r->dlen); if (got < 0) r->status = SDeio; else r->rlen = got; break; case 0x0A: /* write */ case 0x2A: /* write */ r->status = SDeio; /* boot programs don't write */ break; case 0x25: /* read capacity */ /* * Read capacity returns the LBA of the last sector. */ len = r->unit->sectors - 1; p = r->data; *p++ = len>>24; *p++ = len>>16; *p++ = len>>8; *p++ = len; len = r->unit->secsize; *p++ = len>>24; *p++ = len>>16; *p++ = len>>8; *p = len; r->data = (char *)r->data + 8; return SDok; case 0x9E: /* long read capacity */ /* * Read capacity returns the LBA of the last sector. */ len = r->unit->sectors - 1; p = r->data; *p++ = len>>56; *p++ = len>>48; *p++ = len>>40; *p++ = len>>32; *p++ = len>>24; *p++ = len>>16; *p++ = len>>8; *p++ = len; len = r->unit->secsize; *p++ = len>>24; *p++ = len>>16; *p++ = len>>8; *p = len; r->data = (char *)r->data + 8; return SDok; /* ignore others */ } return r->status; } SDev* biosid(SDev* sdev) { for (; sdev; sdev = sdev->next) if (sdev->ifc == &sdbiosifc) sdev->idno = 'B'; return sdev; } static SDev* biospnp(void) { SDev *sdev; /* 9pxeload can't use bios int 13 calls; they wedge the machine */ if (pxe || getconf("*nobiosload") != nil || onlybios0 || !biosinited) return nil; if((sdev = malloc(sizeof(SDev))) != nil) { sdev->ifc = &sdbiosifc; sdev->index = -1; sdev->nunit = 1; } return sdev; } SDifc sdbiosifc = { "bios", /* name */ biospnp, /* pnp */ nil, /* legacy */ biosid, /* id */ nil, /* enable */ nil, /* disable */ biosverify, /* verify */ biosonline, /* online */ biosrio, /* rio */ nil, /* rctl */ nil, /* wctl */ scsibio, /* bio */ };