/* $NetBSD: machdep.c,v 1.100 2026/04/28 03:29:10 thorpej Exp $ */ /* * Copyright (c) 1982, 1986, 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. 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. * * from: Utah Hdr: machdep.c 1.74 92/12/20 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94 */ /* * Copyright (c) 2001 Matthew Fredette. * Copyright (c) 1994, 1995 Gordon W. Ross * Copyright (c) 1993 Adam Glass * Copyright (c) 1988 University of Utah. * * This code is derived from software contributed to Berkeley by * the Systems Programming Group of the University of Utah Computer * Science Department. * * 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. * * from: Utah Hdr: machdep.c 1.74 92/12/20 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94 */ /*- * Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * 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 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. 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. * * @(#)machdep.c 8.6 (Berkeley) 1/14/94 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.100 2026/04/28 03:29:10 thorpej Exp $"); #include "opt_ddb.h" #include "opt_fpu_emulate.h" #include "opt_kgdb.h" #include "opt_modular.h" #include <sys/param.h> #include <sys/buf.h> #include <sys/conf.h> #include <sys/core.h> #include <sys/cpu.h> #include <sys/device.h> #include <sys/exec.h> #include <sys/vmem.h> #include <sys/file.h> #include <sys/ioctl.h> #include <sys/kcore.h> #include <sys/kernel.h> #include <sys/ksyms.h> #include <sys/mbuf.h> #include <sys/module.h> #include <sys/mount.h> #include <sys/msgbuf.h> #include <sys/proc.h> #include <sys/reboot.h> #include <sys/syscallargs.h> #include <sys/sysctl.h> #include <sys/systm.h> #include <sys/tty.h> #include <sys/vnode.h> #ifdef KGDB #include <sys/kgdb.h> #endif #include <uvm/uvm.h> /* XXX: not _extern ... need vm_map_create */ #include <dev/cons.h> #include <dev/mm.h> #define _SUN68K_BUS_DMA_PRIVATE #include <machine/autoconf.h> #include <machine/bus.h> #include <machine/cpu.h> #include <machine/dvma.h> #include <machine/idprom.h> #include <machine/intr.h> #include <machine/kcore.h> #include <machine/pcb.h> #include <machine/pmap.h> #include <machine/promlib.h> #include <machine/psl.h> #include <machine/pte.h> #include <machine/reg.h> #if defined(DDB) #include <machine/db_machdep.h> #include <ddb/db_extern.h> #include <ddb/db_sym.h> #endif #include <dev/vme/vmereg.h> #include <dev/vme/vmevar.h> #include <sun2/sun2/control.h> #include <sun2/sun2/enable.h> #include <sun2/sun2/machdep.h> #include <sun68k/sun68k/vme_sun68k.h> #include "ksyms.h" /* Defined in locore.s */ extern char kernel_text[]; /* Defined by the linker */ extern char etext[]; /* Defined in vfs_bio.c */ extern u_int bufpages; extern void *msgbufaddr; /* Virtual page frame for /dev/mem (see mem.c) */ vaddr_t vmmap; /* Soft copy of the enable register. */ volatile u_short enable_reg_soft = ENABLE_REG_SOFT_UNDEF; /* * dvmamap is used to manage DVMA memory. */ vmem_t *dvma_arena; /* Our private scratch page for dumping the MMU. */ static vaddr_t dumppage; char kernel_arch[16] = "sun2"; /* XXX needs a sysctl node */ /* * cpu_startup: allocate memory for variable-sized tables, * initialize CPU, and do autoconfiguration. * * This is called early in init_main.c:main(), after the * kernel memory allocator is ready for use, but before * the creation of processes 1,2, and mountroot, etc. */ void cpu_startup(void) { #if NKSYMS || defined(DDB) || defined(MODULAR) { extern int nsym; extern char *ssym, *esym; ksyms_addsyms_elf(nsym, ssym, esym); } #endif /* DDB */ /* * XXX fredette - we force a small number of buffers * to help me debug this on my low-memory machine. * this should go away at some point, allowing the * normal automatic buffer-sizing to happen. */ bufpages = 37; /* * Get scratch page for dumpsys(). */ if ((dumppage = uvm_km_alloc(kernel_map, PAGE_SIZE,0, UVM_KMF_WIRED)) == 0) panic("startup: alloc dumppage"); cpu_startup_common(); /* * Allocate a virtual page (for use by /dev/mem) * This page is handed to pmap_enter() therefore * it has to be in the normal kernel VA range. */ vmmap = uvm_km_alloc(kernel_map, PAGE_SIZE, 0, UVM_KMF_VAONLY | UVM_KMF_WAITVA); /* * Allocate DMA map for devices on the bus. */ dvma_arena = vmem_create("dvmamap", DVMA_MAP_BASE, DVMA_MAP_AVAIL, PAGE_SIZE, /* quantum */ NULL, /* importfn */ NULL, /* releasefn */ NULL, /* source */ 0, /* qcache_max */ VM_SLEEP, IPL_VM); if (dvma_arena == NULL) panic("unable to allocate DVMA map"); } /* * machine dependent system variables. */ #if 0 /* XXX - Not yet... */ static int sysctl_machdep_root_device(SYSCTLFN_ARGS) { struct sysctlnode node = *rnode; node.sysctl_data = some permutation on root_device; node.sysctl_size = strlen(root_device) + 1; return (sysctl_lookup(SYSCTLFN_CALL(&node))); } #endif static int sysctl_machdep_booted_kernel(SYSCTLFN_ARGS) { struct sysctlnode node = *rnode; char *cp; cp = prom_getbootfile(); if (cp == NULL || cp[0] == '\0') return (ENOENT); node.sysctl_data = cp; node.sysctl_size = strlen(cp) + 1; return (sysctl_lookup(SYSCTLFN_CALL(&node))); } SYSCTL_SETUP(sysctl_machdep_setup, "sysctl machdep subtree setup") { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "machdep", NULL, NULL, 0, NULL, 0, CTL_MACHDEP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRUCT, "console_device", NULL, sysctl_consdev, 0, NULL, sizeof(dev_t), CTL_MACHDEP, CPU_CONSDEV, CTL_EOL); #if 0 /* XXX - Not yet... */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRING, "root_device", NULL, sysctl_machdep_root_device, 0, NULL, 0, CTL_MACHDEP, CPU_ROOT_DEVICE, CTL_EOL); #endif sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRING, "booted_kernel", NULL, sysctl_machdep_booted_kernel, 0, NULL, 0, CTL_MACHDEP, CPU_BOOTED_KERNEL, CTL_EOL); } void machine_halt(void) { prom_halt(); } void machine_reboot(int howto, char *bootstr) { char *p; char default_boot_string[8]; if (bootstr == NULL) { /* * Build our own boot string with an empty * boot device/file and (maybe) some flags. * The PROM will supply the device/file name. */ p = default_boot_string; *p = '\0'; if (howto & (RB_KDB|RB_ASKNAME|RB_SINGLE)) { /* Append the boot flags. */ *p++ = ' '; *p++ = '-'; if (howto & RB_KDB) *p++ = 'd'; if (howto & RB_ASKNAME) *p++ = 'a'; if (howto & RB_SINGLE) *p++ = 's'; *p = '\0'; } bootstr = default_boot_string; } prom_boot(bootstr); } /* * These variables are needed by /sbin/savecore */ uint32_t dumpmag = 0x8fca0101; /* magic number */ int dumpsize = 0; /* pages */ long dumplo = 0; /* blocks */ #define DUMP_EXTRA 3 /* CPU-dependent extra pages */ /* * This is called by main to set dumplo, dumpsize. * Dumps always skip the first PAGE_SIZE of disk space * in case there might be a disk label stored there. * If there is extra space, put dump at the end to * reduce the chance that swapping trashes it. */ void cpu_dumpconf(void) { int devblks; /* size of dump device in blocks */ int dumpblks; /* size of dump image in blocks */ if (dumpdev == NODEV) return; devblks = bdev_size(dumpdev); if (devblks <= ctod(1)) return; devblks &= ~(ctod(1)-1); /* * Note: savecore expects dumpsize to be the * number of pages AFTER the dump header. */ dumpsize = physmem; /* Position dump image near end of space, page aligned. */ dumpblks = ctod(physmem + DUMP_EXTRA); dumplo = devblks - dumpblks; /* If it does not fit, truncate it by moving dumplo. */ /* Note: Must force signed comparison. */ if (dumplo < ((long)ctod(1))) { dumplo = ctod(1); dumpsize = dtoc(devblks - dumplo) - DUMP_EXTRA; } } /* Note: gdb looks for "dumppcb" in a kernel crash dump. */ struct pcb dumppcb; extern paddr_t avail_start; /* * Write a crash dump. The format while in swap is: * kcore_seg_t cpu_hdr; * cpu_kcore_hdr_t cpu_data; * padding (PAGE_SIZE-sizeof(kcore_seg_t)) * pagemap (2*PAGE_SIZE) * physical memory... */ void dumpsys(void) { const struct bdevsw *dsw; kcore_seg_t *kseg_p; cpu_kcore_hdr_t *chdr_p; struct sun2_kcore_hdr *sh; char *vaddr; paddr_t paddr; int psize, todo, chunk; daddr_t blkno; int error = 0; if (dumpdev == NODEV) return; dsw = bdevsw_lookup(dumpdev); if (dsw == NULL || dsw->d_psize == NULL) return; if (dumppage == 0) return; /* * For dumps during autoconfiguration, * if dump device has already configured... */ if (dumpsize == 0) cpu_dumpconf(); if (dumplo <= 0) { printf("\ndump to dev %u,%u not possible\n", major(dumpdev), minor(dumpdev)); return; } savectx(&dumppcb); psize = bdev_size(dumpdev); if (psize == -1) { printf("dump area unavailable\n"); return; } printf("\ndumping to dev %u,%u offset %ld\n", major(dumpdev), minor(dumpdev), dumplo); /* * Prepare the dump header, including MMU state. */ blkno = dumplo; todo = dumpsize; /* pages */ vaddr = (char*)dumppage; memset(vaddr, 0, PAGE_SIZE); /* Set pointers to all three parts. */ kseg_p = (kcore_seg_t *)vaddr; chdr_p = (cpu_kcore_hdr_t *) (kseg_p + 1); sh = &chdr_p->un._sun2; /* Fill in kcore_seg_t part. */ CORE_SETMAGIC(*kseg_p, KCORE_MAGIC, MID_MACHINE, CORE_CPU); kseg_p->c_size = (ctob(DUMP_EXTRA) - sizeof(*kseg_p)); /* Fill in cpu_kcore_hdr_t part. */ strncpy(chdr_p->name, kernel_arch, sizeof(chdr_p->name)); chdr_p->page_size = PAGE_SIZE; chdr_p->kernbase = KERNBASE; /* Fill in the sun2_kcore_hdr part (MMU state). */ pmap_kcore_hdr(sh); /* Write out the dump header. */ error = (*dsw->d_dump)(dumpdev, blkno, vaddr, PAGE_SIZE); if (error) goto fail; blkno += btodb(PAGE_SIZE); /* translation RAM (pages zero through seven) */ for(chunk = 0; chunk < (PAGE_SIZE * 8); chunk += PAGE_SIZE) { pmap_get_pagemap((int*)vaddr, chunk); error = (*dsw->d_dump)(dumpdev, blkno, vaddr, PAGE_SIZE); if (error) goto fail; blkno += btodb(PAGE_SIZE); } /* * Now dump physical memory. Have to do it in two chunks. * The first chunk is "unmanaged" (by the VM code) and its * range of physical addresses is not allow in pmap_enter. * However, that segment is mapped linearly, so we can just * use the virtual mappings already in place. The second * chunk is done the normal way, using pmap_enter. * * Note that vaddr==(paddr+KERNBASE) for paddr=0 through etext. */ /* Do the first chunk (0 <= PA < avail_start) */ paddr = 0; chunk = btoc(avail_start); if (chunk > todo) chunk = todo; do { if ((todo & 0xf) == 0) printf_nolog("\r%4d", todo); vaddr = (char*)(paddr + KERNBASE); error = (*dsw->d_dump)(dumpdev, blkno, vaddr, PAGE_SIZE); if (error) goto fail; paddr += PAGE_SIZE; blkno += btodb(PAGE_SIZE); --todo; } while (--chunk > 0); /* Do the second chunk (avail_start <= PA < dumpsize) */ vaddr = (char*)vmmap; /* Borrow /dev/mem VA */ do { if ((todo & 0xf) == 0) printf_nolog("\r%4d", todo); pmap_kenter_pa(vmmap, paddr | PMAP_NC, VM_PROT_READ, 0); pmap_update(pmap_kernel()); error = (*dsw->d_dump)(dumpdev, blkno, vaddr, PAGE_SIZE); pmap_kremove(vmmap, PAGE_SIZE); pmap_update(pmap_kernel()); if (error) goto fail; paddr += PAGE_SIZE; blkno += btodb(PAGE_SIZE); } while (--todo > 0); printf("\rdump succeeded\n"); return; fail: printf(" dump error=%d\n", error); } /* straptrap() in trap.c */ /* from hp300: badaddr() */ /* XXX: parityenable() ? */ /* regdump() moved to regdump.c */ #if 0 /* * Soft interrupt support. */ void isr_soft_request(int level) { u_char bit; if ((level < _IPL_SOFT_LEVEL_MIN) || (level > _IPL_SOFT_LEVEL_MAX)) return; bit = 1 << level; enable_reg_or(bit); } void isr_soft_clear(int level) { u_char bit; if ((level < _IPL_SOFT_LEVEL_MIN) || (level > _IPL_SOFT_LEVEL_MAX)) return; bit = 1 << level; enable_reg_and(~bit); } #endif /* * Like _bus_dmamap_load(), but for raw memory allocated with * bus_dmamem_alloc(). */ int _bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) { struct vm_page *m; paddr_t pa; vmem_addr_t dva; bus_size_t sgsize; struct pglist *mlist; int pagesz = PAGE_SIZE; int error; /* * Make sure that on error condition we return "no valid mappings". */ map->dm_nsegs = 0; map->dm_mapsize = 0; /* Allocate DVMA addresses */ sgsize = (size + pagesz - 1) & -pagesz; /* * If the device can see our entire 24-bit address space, * we can use any properly aligned virtual addresses. */ if ((map->_dm_flags & BUS_DMA_24BIT) != 0) { dva = _bus_dma_valloc_skewed(sgsize, map->_dm_boundary, pagesz, 0); if (dva == 0) return (ENOMEM); } /* * Otherwise, we need virtual addresses in DVMA space. */ else { const vm_flag_t vmflags = VM_BESTFIT | ((flags & BUS_DMA_NOWAIT) ? VM_NOSLEEP : VM_SLEEP); error = vmem_xalloc(dvma_arena, sgsize, 0, /* alignment */ 0, /* phase */ map->_dm_boundary, /* nocross */ VMEM_ADDR_MIN, /* minaddr */ VMEM_ADDR_MAX, /* maxaddr */ vmflags, &dva); if (error) return (error); } /* Fill in the segment. */ map->dm_segs[0].ds_addr = dva; map->dm_segs[0].ds_len = size; map->dm_segs[0]._ds_va = dva; map->dm_segs[0]._ds_sgsize = sgsize; /* Map physical pages into MMU */ mlist = segs[0]._ds_mlist; for (m = TAILQ_FIRST(mlist); m != NULL; m = TAILQ_NEXT(m,pageq.queue)) { if (sgsize == 0) panic("_bus_dmamap_load_raw: size botch"); pa = VM_PAGE_TO_PHYS(m); pmap_enter(pmap_kernel(), dva, (pa & -pagesz) | PMAP_NC, VM_PROT_READ|VM_PROT_WRITE, PMAP_WIRED); dva += pagesz; sgsize -= pagesz; } pmap_update(pmap_kernel()); /* Make the map truly valid. */ map->dm_nsegs = 1; map->dm_mapsize = size; return (0); } /* * load DMA map with a linear buffer. */ int _bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) { bus_size_t sgsize; vaddr_t va = (vaddr_t)buf; int pagesz = PAGE_SIZE; vmem_addr_t dva; pmap_t pmap; int rv __diagused; /* * Make sure that on error condition we return "no valid mappings". */ map->dm_nsegs = 0; map->dm_mapsize = 0; if (buflen > map->_dm_size) return (EINVAL); /* * A 24-bit device can see all of our kernel address space, so * if we have KVAs, we can just load them as-is, no mapping * necessary. */ if ((map->_dm_flags & BUS_DMA_24BIT) != 0 && p == NULL) { /* * XXX Need to implement "don't DMA across this boundary". */ if (map->_dm_boundary != 0) panic("bus_dmamap_load: boundaries not implemented"); map->dm_mapsize = buflen; map->dm_nsegs = 1; map->dm_segs[0].ds_addr = (bus_addr_t)va; map->dm_segs[0].ds_len = buflen; map->_dm_flags |= _BUS_DMA_DIRECTMAP; return (0); } /* * Allocate a region in DVMA space. */ sgsize = m68k_round_page(buflen + (va & (pagesz - 1))); const vm_flag_t vmflags = VM_BESTFIT | ((flags & BUS_DMA_NOWAIT) ? VM_NOSLEEP : VM_SLEEP); if (vmem_xalloc(dvma_arena, sgsize, 0, /* alignment */ 0, /* phase */ map->_dm_boundary, /* nocross */ VMEM_ADDR_MIN, /* minaddr */ VMEM_ADDR_MAX, /* maxaddr */ vmflags, &dva) != 0) { return (ENOMEM); } /* Fill in the segment. */ map->dm_segs[0].ds_addr = dva + (va & (pagesz - 1)); map->dm_segs[0].ds_len = buflen; map->dm_segs[0]._ds_va = dva; map->dm_segs[0]._ds_sgsize = sgsize; /* * Now map the DVMA addresses we allocated to point to the * pages of the caller's buffer. */ if (p != NULL) pmap = p->p_vmspace->vm_map.pmap; else pmap = pmap_kernel(); for (; buflen > 0; ) { paddr_t pa; /* * Get the physical address for this page. */ rv = pmap_extract(pmap, va, &pa); #ifdef DIAGNOSTIC if (!rv) panic("_bus_dmamap_load: no page"); #endif /* DIAGNOSTIC */ /* * Compute the segment size, and adjust counts. */ sgsize = pagesz - (va & (pagesz - 1)); if (buflen < sgsize) sgsize = buflen; pmap_enter(pmap_kernel(), dva, (pa & -pagesz) | PMAP_NC, VM_PROT_READ|VM_PROT_WRITE, PMAP_WIRED); dva += pagesz; va += sgsize; buflen -= sgsize; } pmap_update(pmap_kernel()); /* Make the map truly valid. */ map->dm_nsegs = 1; map->dm_mapsize = map->dm_segs[0].ds_len; return (0); } /* * unload a DMA map. */ void _bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) { bus_dma_segment_t *segs = map->dm_segs; int nsegs = map->dm_nsegs; int flags = map->_dm_flags; bus_addr_t dva; bus_size_t len; if (nsegs != 1) panic("_bus_dmamem_unload: nsegs = %d", nsegs); /* * _BUS_DMA_DIRECTMAP is set iff this map was loaded using * _bus_dmamap_load for a 24-bit device. */ if ((flags & _BUS_DMA_DIRECTMAP) != 0) { /* Nothing to release */ map->_dm_flags &= ~_BUS_DMA_DIRECTMAP; } /* * Otherwise, this map was loaded using _bus_dmamap_load for a * non-24-bit device, or using _bus_dmamap_load_raw. */ else { dva = segs[0]._ds_va & -PAGE_SIZE; len = segs[0]._ds_sgsize; /* * Unmap the DVMA addresses. */ pmap_remove(pmap_kernel(), dva, dva + len); pmap_update(pmap_kernel()); /* * Free the DVMA addresses. */ if ((flags & BUS_DMA_24BIT) != 0) { /* * This map was loaded using _bus_dmamap_load_raw * for a 24-bit device. */ uvm_unmap(kernel_map, dva, dva + len); } else { /* * This map was loaded using _bus_dmamap_load or * _bus_dmamap_load_raw for a non-24-bit device. */ vmem_xfree(dvma_arena, dva, len); } } /* Mark the mappings as invalid. */ map->dm_mapsize = 0; map->dm_nsegs = 0; } /* * Translate a VME address and address modifier * into a CPU physical address and page type. */ int vmebus_translate(vme_am_t mod, vme_addr_t addr, bus_type_t *btp, bus_addr_t *bap) { bus_addr_t base; switch(mod) { #define _DS (VME_AM_MBO | VME_AM_SUPER | VME_AM_DATA) case (VME_AM_A16|_DS): base = 0x00ff0000; break; case (VME_AM_A24|_DS): base = 0; break; default: return (ENOENT); #undef _DS } *bap = base | addr; *btp = (*bap & 0x800000 ? PMAP_VME8 : PMAP_VME0); return (0); } /* * If we can find a mapping that was established by the PROM, use it. */ int find_prom_map(paddr_t pa, bus_type_t iospace, int len, vaddr_t *vap) { u_long pf; int pgtype; vaddr_t va, eva; int sme; u_long pte; int saved_ctx; /* * The mapping must fit entirely within one page. */ if ((((u_long)pa & PGOFSET) + len) > PAGE_SIZE) return EINVAL; pf = PA_PGNUM(pa); pgtype = iospace << PG_MOD_SHIFT; saved_ctx = kernel_context(); /* * Walk the PROM address space, looking for a page with the * mapping we want. */ for (va = SUN_MONSTART; va < SUN_MONEND; ) { /* * Make sure this segment is mapped. */ sme = get_segmap(va); if (sme == SEGINV) { va += NBSG; continue; /* next segment */ } /* * Walk the pages of this segment. */ for(eva = va + NBSG; va < eva; va += PAGE_SIZE) { pte = get_pte(va); if ((pte & (PG_VALID | PG_TYPE)) == (PG_VALID | pgtype) && PG_PFNUM(pte) == pf) { /* * Found the PROM mapping. * note: preserve page offset */ *vap = (va | ((vaddr_t)pa & PGOFSET)); restore_context(saved_ctx); return 0; } } } restore_context(saved_ctx); return ENOENT; } bool mm_md_direct_mapped_phys(paddr_t paddr, vaddr_t *vaddr) { if (paddr >= avail_start) return false; *vaddr = paddr; return true; } /* * Allow access to the PROM mapping similar to uvm_kernacc(). */ int mm_md_kernacc(void *ptr, vm_prot_t prot, bool *handled) { if ((vaddr_t)ptr < SUN2_PROM_BASE || (vaddr_t)ptr > SUN2_MONEND) { *handled = false; return 0; } *handled = true; /* Read in the PROM itself is OK, write not. */ if ((prot & VM_PROT_WRITE) == 0) return 0; return EFAULT; }
