/* $NetBSD: upa.c,v 1.7 2000/06/29 07:37:55 mrg Exp $ */ /*- * Copyright (c) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Paul Kranenburg. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This software was developed by the Computer Systems Engineering group * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and * contributed to Berkeley. * * All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Lawrence Berkeley Laboratory. * * 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)sbus.c 8.1 (Berkeley) 6/11/93 */ /* #define DEBUG_1 */ /* * UPA bus stuff. */ #include #include #include #include #include #include #include #include #include void upareset __P((int)); static bus_space_tag_t upa_alloc_bustag __P((struct upa_softc *)); static int upa_get_intr __P((struct upa_softc *, int, int *)); static int upa_bus_mmap __P((bus_space_tag_t, bus_type_t, bus_addr_t, int, bus_space_handle_t *)); static int _upa_bus_map __P(( bus_space_tag_t, bus_type_t, /*slot*/ bus_addr_t, /*offset*/ bus_size_t, /*size*/ int, /*flags*/ vaddr_t, /*preferred virtual address */ bus_space_handle_t *)); static void *upa_intr_establish __P(( bus_space_tag_t, int, /*level*/ int, /*flags*/ int (*) __P((void *)), /*handler*/ void *)); /*handler arg*/ /* autoconfiguration driver */ int upa_match_mainbus __P((struct device *, struct cfdata *, void *)); void upa_attach_mainbus __P((struct device *, struct device *, void *)); struct cfattach upa_ca = { sizeof(struct upa_softc), upa_match, upa_attach }; extern struct cfdriver upa_cd; /* * Print the location of some upa-attached device (called just * before attaching that device). If `upa' is not NULL, the * device was found but not configured; print the upa as well. * Return UNCONF (config_find ignores this if the device was configured). */ int upa_print(args, busname) void *args; const char *busname; { struct upa_attach_args *ua = args; if (busname) printf("%s at %s", ua->ua_name, busname); if (ua->ua_interrupts) { int level = ua->ua_pri; struct upa_softc *sc = (struct upa_softc *) ua->ua_bustag->cookie; printf(" interrupt %x", ua->ua_interrupts); } return (UNCONF); } int upa_match(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { struct mainbus_attach_args *ma = aux; return (strcmp(cf->cf_driver->cd_name, ma->ma_name) == 0); } int upa_match_iommu(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { struct iommu_attach_args *ia = aux; if (CPU_ISSUN4) return (0); return (strcmp(cf->cf_driver->cd_name, ia->iom_name) == 0); } int upa_match_xbox(parent, cf, aux) struct device *parent; struct cfdata *cf; void *aux; { struct xbox_attach_args *xa = aux; if (CPU_ISSUN4) return (0); return (strcmp(cf->cf_driver->cd_name, xa->xa_name) == 0); } /* * Attach an Upa. */ void upa_attach_mainbus(parent, self, aux) struct device *parent; struct device *self; void *aux; { struct upa_softc *sc = (struct upa_softc *)self; struct mainbus_attach_args *ma = aux; int node = ma->ma_node; /* * XXX there is only one Upa, for now -- do not know how to * address children on others */ if (sc->sc_dev.dv_unit > 0) { printf(" unsupported\n"); return; } sc->sc_bustag = ma->ma_bustag; sc->sc_dmatag = ma->ma_dmatag; /* Setup interrupt translation tables */ sc->sc_intr2ipl = CPU_ISSUN4C ? intr_upa2ipl_4c : intr_upa2ipl_4m; /* * Record clock frequency for synchronous SCSI. * IS THIS THE CORRECT DEFAULT?? */ sc->sc_clockfreq = getpropint(node, "clock-frequency", 25*1000*1000); printf(": clock = %s MHz\n", clockfreq(sc->sc_clockfreq)); upa_attach(sc, "upa", node, NULL); } void upa_attach_iommu(parent, self, aux) struct device *parent; struct device *self; void *aux; { struct upa_softc *sc = (struct upa_softc *)self; struct iommu_attach_args *ia = aux; int node = ia->iom_node; sc->sc_bustag = ia->iom_bustag; sc->sc_dmatag = ia->iom_dmatag; /* Setup interrupt translation tables */ sc->sc_intr2ipl = CPU_ISSUN4C ? intr_upa2ipl_4c : intr_upa2ipl_4m; /* * Record clock frequency for synchronous SCSI. * IS THIS THE CORRECT DEFAULT?? */ sc->sc_clockfreq = getpropint(node, "clock-frequency", 25*1000*1000); printf(": clock = %s MHz\n", clockfreq(sc->sc_clockfreq)); upa_attach(sc, "upa", node, NULL); } void upa_attach_xbox(parent, self, aux) struct device *parent; struct device *self; void *aux; { struct upa_softc *sc = (struct upa_softc *)self; struct xbox_attach_args *xa = aux; int node = xa->xa_node; sc->sc_bustag = xa->xa_bustag; sc->sc_dmatag = xa->xa_dmatag; /* Setup interrupt translation tables */ sc->sc_intr2ipl = CPU_ISSUN4C ? intr_upa2ipl_4c : intr_upa2ipl_4m; /* * Record clock frequency for synchronous SCSI. * IS THIS THE CORRECT DEFAULT?? */ sc->sc_clockfreq = getpropint(node, "clock-frequency", 25*1000*1000); printf(": clock = %s MHz\n", clockfreq(sc->sc_clockfreq)); upa_attach(sc, "upa", node, NULL); } void upa_attach(sc, busname, busnode, specials) struct upa_softc *sc; char *busname; int busnode; const char * const *specials; { int node0, node, error; const char *sp; const char *const *ssp; bus_space_tag_t sbt; struct upa_attach_args ua; sbt = upa_alloc_bustag(sc); /* * Get the Upa burst transfer size if burst transfers are supported */ sc->sc_burst = getpropint(busnode, "burst-sizes", 0); /* * Collect address translations from the OBP. */ error = getprop(busnode, "ranges", sizeof(struct rom_range), &sc->sc_nrange, (void **)&sc->sc_range); switch (error) { case 0: break; case ENOENT: /* Fall back to our own `range' construction */ sc->sc_range = upa_translations; sc->sc_nrange = sizeof(upa_translations)/sizeof(upa_translations[0]); break; default: panic("%s: error getting ranges property", sc->sc_dev.dv_xname); } /* WARNING -- this stuff needs to be set somewhere */ sc->sc_sysio = (struct sysioreg*) ra->ra_vaddr; /* Use prom mapping for sysio. */ sc->sc_ign = ra->ra_interrupt[0] & INTMAP_IGN; /* Find interrupt group no */ /* * Setup the iommu. * * The sun4u iommu is part of the UPA controller so we will * deal with it here. We could try to fake a device node so * we can eventually share it with the PCI bus run by psyco, * but I don't want to get into that sort of cruft. */ #ifdef NOTDEF_DEBUG { /* Probe the iommu */ int64_t cr, tsb; printf("\niommu regs at: cr=%x tsb=%x flush=%x\n", &sc->sc_sysio->sys_iommu.iommu_cr, &sc->sc_sysio->sys_iommu.iommu_tsb, &sc->sc_sysio->sys_iommu.iommu_flush); cr = sc->sc_sysio->sys_iommu.iommu_cr; tsb = sc->sc_sysio->sys_iommu.iommu_tsb; printf("iommu cr=%x:%x tsb=%x:%x\n", (long)(cr>>32), (long)cr, (long)(tsb>>32), (long)tsb); delay(1000000); /* 1 s */ } #endif /* * All IOMMUs will share the same TSB which is allocated in pmap_bootstrap. * * This makes device management easier. */ sc->sc_tsbsize = iotsbsize; sc->sc_tsb = iotsb; sc->sc_ptsb = iotsbp; #if 0 /* Need to do 64-bit stores */ sc->sc_sysio->sys_iommu.iommu_cr = (IOMMUCR_TSB1K|IOMMUCR_8KPG|IOMMUCR_EN); sc->sc_sysio->sys_iommu.iommu_tsb = sc->sc_ptsb; #else stxa(&sc->sc_sysio->sys_iommu.iommu_cr,ASI_NUCLEUS,(IOMMUCR_TSB1K|IOMMUCR_8KPG|IOMMUCR_EN)); stxa(&sc->sc_sysio->sys_iommu.iommu_tsb,ASI_NUCLEUS,sc->sc_ptsb); #endif /* * Loop through ROM children, fixing any relative addresses * and then configuring each device. * `specials' is an array of device names that are treated * specially: */ node0 = firstchild(busnode); for (ssp = specials ; ssp != NULL && *(sp = *ssp) != 0; ssp++) { if ((node = findnode(node0, sp)) == 0) { panic("could not find %s amongst %s devices", sp, busname); } if (upa_setup_attach_args(sc, sbt, sc->sc_dmatag, node, &ua) != 0) { panic("upa_attach: %s: incomplete", sp); } (void) config_found(&sc->sc_dev, (void *)&ua, upa_print); } for (node = node0; node; node = nextsibling(node)) { char *name = getpropstring(node, "name"); for (ssp = specials, sp = NULL; ssp != NULL && (sp = *ssp) != NULL; ssp++) if (strcmp(name, sp) == 0) break; if (sp != NULL) /* Already configured as an "early" device */ continue; <<<<<<<<<<<<<< variant A upa_translate(self, &oca); oca.ca_bustype = BUS_UPA; /* Now we need to enable this interrupt if a handler has been registered */ if( config_found(&sc->sc_dev, (void *)&oca, upa_print) != NULL ) for( i=0; isc_sysio->scsi_int_map; intrptr < &sc->sc_sysio->reserved_int_map && ((intrmap=*intrptr)&INTMAP_INR) != oca.ca_ra.ra_interrupt[i]; intrptr++); if((intrmap&INTMAP_INR) == oca.ca_ra.ra_interrupt[i]) { #ifdef IRQEN_DEBUG printf("Found %x IRQ as %x:%x in slot\n", oca.ca_ra.ra_interrupt[i], (int)(intrmap>>32), (int)intrmap, intrptr - &sc->sc_sysio->scsi_int_map); #endif /* Enable the interrupt */ intrmap |= INTMAP_V; stxa(intrptr, ASI_NUCLEUS, intrmap); /* Register the map and clear intr registers */ intrlev[oca.ca_ra.ra_interrupt[i]]->ih_map = intrptr; intrlev[oca.ca_ra.ra_interrupt[i]]->ih_clr = &sc->sc_sysio->scsi_clr_int + (intrptr - &sc->sc_sysio->scsi_int_map); } } } #ifdef IRQEN_DEBUG for( i=0; i<140000000; i++); #endif >>>>>>>>>>>>>> variant B if (upa_setup_attach_args(sc, sbt, sc->sc_dmatag, node, bp, &ua) != 0) { printf("upa_attach: %s: incomplete\n", name); continue; } (void) config_found(&sc->sc_dev, (void *)&ua, upa_print); ======= end of combination } } int upa_setup_attach_args(sc, bustag, dmatag, node, ua) struct upa_softc *sc; bus_space_tag_t bustag; bus_dma_tag_t dmatag; int node; struct upa_attach_args *ua; { struct rom_reg romreg; int base; int error; bzero(ua, sizeof(struct upa_attach_args)); ua->ua_name = getpropstring(node, "name"); ua->ua_bustag = bustag; ua->ua_dmatag = dmatag; ua->ua_node = node; if ((error = getprop_reg1(node, &romreg)) != 0) return (error); /* We pass only the first "reg" property */ base = (int)romreg.rr_paddr; if (UPA_ABS(base)) { ua->ua_slot = UPA_ABS_TO_SLOT(base); ua->ua_offset = UPA_ABS_TO_OFFSET(base); } else { ua->ua_slot = romreg.rr_iospace; ua->ua_offset = base; } ua->ua_size = romreg.rr_len; if ((error = upa_get_intr(sc, node, &ua->ua_pri)) != 0) return (error); if ((error = getprop_address1(node, &ua->ua_promvaddr)) != 0) return (error); return (0); } int _upa_bus_map(t, btype, offset, size, flags, vaddr, hp) bus_space_tag_t t; bus_type_t btype; bus_addr_t offset; bus_size_t size; int flags; vaddr_t vaddr; bus_space_handle_t *hp; { struct upa_softc *sc = t->cookie; int slot = btype; int i; for (i = 0; i < sc->sc_nrange; i++) { bus_addr_t paddr; bus_type_t iospace; if (sc->sc_range[i].cspace != slot) continue; /* We've found the connection to the parent bus */ paddr = sc->sc_range[i].poffset + offset; iospace = sc->sc_range[i].pspace; return (bus_space_map2(sc->sc_bustag, iospace, paddr, size, flags, vaddr, hp)); } return (EINVAL); } int upa_bus_mmap(t, btype, paddr, flags, hp) bus_space_tag_t t; bus_type_t btype; bus_addr_t paddr; int flags; bus_space_handle_t *hp; { int slot = (int)btype; int offset = (int)paddr; struct upa_softc *sc = t->cookie; int i; for (i = 0; i < sc->sc_nrange; i++) { bus_addr_t paddr; bus_addr_t iospace; if (sc->sc_range[i].cspace != slot) continue; paddr = sc->sc_range[i].poffset + offset; iospace = (bus_addr_t)sc->sc_range[i].pspace; return (bus_space_mmap(sc->sc_bustag, iospace, paddr, flags, hp)); } return (-1); } /* * Each attached device calls upa_establish after it initializes * its upadev portion. */ void upa_establish(sd, dev) register struct upadev *sd; register struct device *dev; { register struct upa_softc *sc; register struct device *curdev; /* * We have to look for the upa by name, since it is not necessarily * our immediate parent (i.e. sun4m /iommu/upa/espdma/esp) * We don't just use the device structure of the above-attached * upa, since we might (in the future) support multiple upa's. */ for (curdev = dev->dv_parent; ; curdev = curdev->dv_parent) { if (!curdev || !curdev->dv_xname) panic("upa_establish: can't find upa parent for %s", sd->sd_dev->dv_xname ? sd->sd_dev->dv_xname : "" ); if (strncmp(curdev->dv_xname, "upa", 4) == 0) break; } sc = (struct upa_softc *) curdev; sd->sd_dev = dev; sd->sd_bchain = sc->sc_sbdev; sc->sc_sbdev = sd; } /* * Reset the given upa. (???) */ void upareset(upa) int upa; { register struct upadev *sd; struct upa_softc *sc = upa_cd.cd_devs[upa]; struct device *dev; printf("reset %s:", sc->sc_dev.dv_xname); for (sd = sc->sc_sbdev; sd != NULL; sd = sd->sd_bchain) { if (sd->sd_reset) { dev = sd->sd_dev; (*sd->sd_reset)(dev); printf(" %s", dev->dv_xname); } } #if 0 /* Reload iommu regs */ sc->sc_sysio->sys_iommu.iommu_cr = (IOMMUCR_TSB1K|IOMMUCR_8KPG|IOMMUCR_EN); sc->sc_sysio->sys_iommu.iommu_tsb = sc->sc_ptsb; #else /* Reload iommu regs */ stxa(&sc->sc_sysio->sys_iommu.iommu_cr,ASI_NUCLEUS,(IOMMUCR_TSB1K|IOMMUCR_8KPG|IOMMUCR_EN)); stxa(&sc->sc_sysio->sys_iommu.iommu_tsb,ASI_NUCLEUS,sc->sc_ptsb); #endif } /* * Here are the iommu control routines. */ void upa_enter(va, pa) vaddr_t va; paddr_t pa; { struct upa_softc *sc = upa_sc; int64_t tte; #ifdef DIAGNOSTIC if (va < sc->sc_dvmabase) panic("upa_enter: va 0x%x not in DVMA space",va); #endif #ifdef 1 /* Streaming */ tte = MAKEIOTTE(pa, 1, 1, 1); #else /* Consistent */ tte = MAKEIOTTE(pa, 1, 1, 0); #endif sc->sc_tsb[IOTSBSLOT(va,sc->sc_tsbsize)] = tte; #if 0 sc->sc_sysio->sys_iommu.iommu_flush = va; #else stxa(&sc->sc_sysio->sys_iommu.iommu_flush,ASI_NUCLEUS,va); #endif #ifdef DEBUG_1 printf("upa_enter: added xlation va %x pa %x:%x TSB[%x]=%x:%x\n", va, (int)(pa>>32), (int)pa, IOTSBSLOT(va,sc->sc_tsbsize), (int)(tte>>32), (int)tte); #endif } /* * upa_clear: clears mappings created by upa_enter */ void upa_remove(va, len) register vaddr_t va; register u_int len; { register struct upa_softc *sc = upa_sc; #ifdef DIAGNOSTIC if (va < sc->sc_dvmabase) panic("upa_remove: va 0x%x not in DVMA space", va); #endif while (len > 0) { static volatile int flushdone; int flushtimeout; extern u_int ksegv; extern u_int64_t ksegp; /* * Streaming buffer flushes: * * 1 Tell strbuf to flush by storing va to strbuf_pgflush * If we're not on a cache line boundary (64-bits): * 2 Store 0 in flag * 3 Store pointer to flag in flushsync * 4 wait till flushsync becomes 0x1 * * If it takes more than .5 sec, something went wrong. */ #if 0 sc->sc_sysio->sys_strbuf.strbuf_pgflush = va; #else stxa(&(sc->sc_sysio->sys_strbuf.strbuf_pgflush), ASI_NUCLEUS, va); #endif if( len < NBPG && ((va+len) & 0x3f) ) { flushdone = 0; /* * KLUGE ALERT KLUGE ALERT * * In order not to bother with pmap_extract() to do the vtop * translation, flushdone is a static variable that resides in * the kernel's 4MB locked TTE. This means that this routine * is NOT re-entrant. Since we're single-threaded and poll * on this value, this is currently not a problem. */ #ifdef DEBUG_1 printf("upa_remove: flush = %x at va = %x pa = %x\n", flushdone, &flushdone, (long)(((long)&flushdone) - ksegv + ksegp)); #endif #if 0 sc->sc_sysio->sys_strbuf.strbuf_flushsync = (long)(((long)&flushdone) - ksegv + ksegp); #else stxa(&sc->sc_sysio->sys_strbuf.strbuf_flushsync, ASI_NUCLEUS, (long)(((long)&flushdone) - ksegv + ksegp)); #endif flushtimeout = 250000000; /* 1 sec on a 250MHz machine */ while( !flushdone && flushtimeout--) membar_sync(); #ifdef DIAGNOSTIC if( !flushdone ) printf("upa_remove: flush timeout %x at %x\n", flushdone, (long)(((long)&flushdone) - ksegv + ksegp)); /* panic? */ #endif } sc->sc_tsb[IOTSBSLOT(va,sc->sc_tsbsize)] = 0; #if 0 sc->sc_sysio->sys_iommu.iommu_flush = va; #else stxa(&sc->sc_sysio->sys_iommu.iommu_flush, ASI_NUCLEUS, va); #endif len -= NBPG; va += NBPG; } } /* * Get interrupt attributes for an Upa device. */ int upa_get_intr(sc, node, ip) struct upa_softc *sc; int node; int *ip; { struct rom_intr *rip; int *ipl; int n; /* * The `interrupts' property contains the Upa interrupt level. */ ipl = NULL; if (getprop(node, "interrupts", sizeof(int), &n, (void **)&ipl) == 0) { *ip = ipl[0]; free(ipl, M_DEVBUF); return (0); } /* * Fall back on `intr' property. */ rip = NULL; switch (getprop(node, "intr", sizeof(*rip), &n, (void **)&rip)) { case 0: *ip = (rip[0].int_pri & 0xf) | UPA_INTR_COMPAT; free(rip, M_DEVBUF); return (0); case ENOENT: *ip = 0; return (0); } return (-1); } /* * Install an interrupt handler for an Upa device. */ void * upa_intr_establish(t, level, flags, handler, arg) bus_space_tag_t t; int level; int flags; int (*handler) __P((void *)); void *arg; { struct upa_softc *sc = t->cookie; struct intrhand *ih; int ipl; ih = (struct intrhand *) malloc(sizeof(struct intrhand), M_DEVBUF, M_NOWAIT); if (ih == NULL) return (NULL); if ((flags & BUS_INTR_ESTABLISH_SOFTINTR) != 0) ipl = level; else if ((level & UPA_INTR_COMPAT) != 0) ipl = level & ~UPA_INTR_COMPAT; else ipl = sc->sc_intr2ipl[level]; ih->ih_fun = handler; ih->ih_arg = arg; intr_establish(ipl, ih); return (ih); } static bus_space_tag_t upa_alloc_bustag(sc) struct upa_softc *sc; { bus_space_tag_t sbt; sbt = (bus_space_tag_t) malloc(sizeof(struct sparc_bus_space_tag), M_DEVBUF, M_NOWAIT); if (sbt == NULL) return (NULL); bzero(sbt, sizeof *sbt); sbt->cookie = sc; sbt->parent = sc->sc_bustag; sbt->sparc_bus_map = _upa_bus_map; sbt->sparc_bus_mmap = upa_bus_mmap; sbt->sparc_intr_establish = upa_intr_establish; return (sbt); }