/*- * Copyright (c) 1991 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * 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: @(#)isa.c 7.2 (Berkeley) 5/13/91 * $Id: isa.c,v 1.38 1995/02/25 18:29:10 phk Exp $ */ /* * code to manage AT bus * * 92/08/18 Frank P. MacLachlan (fpm@crash.cts.com): * Fixed uninitialized variable problem and added code to deal * with DMA page boundaries in isa_dmarangecheck(). Fixed word * mode DMA count compution and reorganized DMA setup code in * isa_dmastart() */ #include #include /* isn't it a joy */ #include /* to have three of these */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "vector.h" /* ** Register definitions for DMA controller 1 (channels 0..3): */ #define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ #define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ #define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ #define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ /* ** Register definitions for DMA controller 2 (channels 4..7): */ #define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ #define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ #define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ #define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ /* * Bits to specify the type and amount of conflict checking. */ #define CC_ATTACH (1 << 0) #define CC_DRQ (1 << 1) #define CC_IOADDR (1 << 2) #define CC_IRQ (1 << 3) #define CC_MEMADDR (1 << 4) /* * XXX these defines should be in a central place. */ #define read_eflags() ({u_long ef; \ __asm("pushfl; popl %0" : "=a" (ef)); \ ef; }) #define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) u_long *intr_countp[ICU_LEN]; inthand2_t *intr_handler[ICU_LEN]; u_int intr_mask[ICU_LEN]; int intr_unit[ICU_LEN]; struct kern_devconf kdc_isa0 = { 0, 0, 0, /* filled in by dev_attach */ "isa", 0, { MDDT_BUS, 0 }, 0, 0, 0, BUS_EXTERNALLEN, 0, /* no parent yet; parent should be CPU */ 0, /* no parentdata */ DC_BUSY, /* busses are always busy */ "ISA or EISA bus" }; static inthand_t *fastintr[ICU_LEN] = { &IDTVEC(fastintr0), &IDTVEC(fastintr1), &IDTVEC(fastintr2), &IDTVEC(fastintr3), &IDTVEC(fastintr4), &IDTVEC(fastintr5), &IDTVEC(fastintr6), &IDTVEC(fastintr7), &IDTVEC(fastintr8), &IDTVEC(fastintr9), &IDTVEC(fastintr10), &IDTVEC(fastintr11), &IDTVEC(fastintr12), &IDTVEC(fastintr13), &IDTVEC(fastintr14), &IDTVEC(fastintr15) }; static inthand_t *slowintr[ICU_LEN] = { &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) }; static void config_isadev __P((struct isa_device *isdp, u_int *mp)); static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, int item, char const *whatnot, char const *reason, char const *format)); static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, u_int checkbits)); static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); static inthand2_t isa_strayintr; static void register_imask __P((struct isa_device *dvp, u_int mask)); /* * print a conflict message */ static void conflict(dvp, tmpdvp, item, whatnot, reason, format) struct isa_device *dvp; struct isa_device *tmpdvp; int item; char const *whatnot; char const *reason; char const *format; { printf("%s%d not %sed due to %s conflict with %s%d at ", dvp->id_driver->name, dvp->id_unit, whatnot, reason, tmpdvp->id_driver->name, tmpdvp->id_unit); printf(format, item); printf("\n"); } /* * Check to see if things are alread in use, like IRQ's, I/O addresses * and Memory addresses. */ static int haveseen(dvp, tmpdvp, checkbits) struct isa_device *dvp; struct isa_device *tmpdvp; u_int checkbits; { /* * Only check against devices that have already been found */ if (tmpdvp->id_alive) { char const *whatnot; whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; /* * Check for I/O address conflict. We can only check the * starting address of the device against the range of the * device that has already been probed since we do not * know how many I/O addresses this device uses. */ if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { if ((dvp->id_iobase >= tmpdvp->id_iobase) && (dvp->id_iobase <= (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, "I/O address", "0x%x"); return 1; } } /* * Check for Memory address conflict. We can check for * range overlap, but it will not catch all cases since the * driver may adjust the msize paramater during probe, for * now we just check that the starting address does not * fall within any allocated region. * XXX could add a second check after the probe for overlap, * since at that time we would know the full range. * XXX KERNBASE is a hack, we should have vaddr in the table! */ if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && (KERNBASE + dvp->id_maddr <= (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { conflict(dvp, tmpdvp, (int)dvp->id_maddr, whatnot, "maddr", "0x%x"); return 1; } } /* * Check for IRQ conflicts. */ if (checkbits & CC_IRQ && tmpdvp->id_irq) { if (tmpdvp->id_irq == dvp->id_irq) { conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, whatnot, "irq", "%d"); return 1; } } /* * Check for DRQ conflicts. */ if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { if (tmpdvp->id_drq == dvp->id_drq) { conflict(dvp, tmpdvp, dvp->id_drq, whatnot, "drq", "%d"); return 1; } } } return 0; } /* * Search through all the isa_devtab_* tables looking for anything that * conflicts with the current device. */ static int haveseen_isadev(dvp, checkbits) struct isa_device *dvp; u_int checkbits; { struct isa_device *tmpdvp; int status = 0; for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { status |= haveseen(dvp, tmpdvp, checkbits); if (status) return status; } return(status); } /* * Configure all ISA devices */ void isa_configure() { struct isa_device *dvp; dev_attach(&kdc_isa0); splhigh(); enable_intr(); INTREN(IRQ_SLAVE); printf("Probing for devices on the ISA bus:\n"); /* First probe all the sensitive probes */ for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, &tty_imask); for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, &bio_imask); for (dvp = isa_devtab_net; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, &net_imask); for (dvp = isa_devtab_null; dvp->id_driver; dvp++) if (dvp->id_driver->sensitive_hw) config_isadev(dvp, (u_int *)NULL); /* Then all the bad ones */ for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, &tty_imask); for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, &bio_imask); for (dvp = isa_devtab_net; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, &net_imask); for (dvp = isa_devtab_null; dvp->id_driver; dvp++) if (!dvp->id_driver->sensitive_hw) config_isadev(dvp, (u_int *)NULL); bio_imask |= SWI_CLOCK_MASK; net_imask |= SWI_NET_MASK; tty_imask |= SWI_TTY_MASK; /* * XXX we should really add the tty device to net_imask when the line is * switched to SLIPDISC, and then remove it when it is switched away from * SLIPDISC. No need to block out ALL ttys during a splimp when only one * of them is running slip. * * XXX actually, blocking all ttys during a splimp doesn't matter so much * with sio because the serial interrupt layer doesn't use tty_imask. Only * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked * during spltty. */ #include "sl.h" #include "ppp.h" #if (NSL > 0) || (NPPP > 0) net_imask |= tty_imask; tty_imask = net_imask; #endif /* bio_imask |= tty_imask ; can some tty devices use buffers? */ #ifdef DIAGNOSTIC printf("bio_imask %x tty_imask %x net_imask %x\n", bio_imask, tty_imask, net_imask); #endif /* * Finish initializing intr_mask[]. Note that the partly * constructed masks aren't actually used since we're at splhigh. * For fully dynamic initialization, register_intr() and * unregister_intr() will have to adjust the masks for _all_ * interrupts and for tty_imask, etc. */ for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) register_imask(dvp, tty_imask); for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) register_imask(dvp, bio_imask); for (dvp = isa_devtab_net; dvp->id_driver; dvp++) register_imask(dvp, net_imask); for (dvp = isa_devtab_null; dvp->id_driver; dvp++) register_imask(dvp, SWI_CLOCK_MASK); spl0(); } /* * Configure an ISA device. */ static void config_isadev_c(); static void config_isadev(isdp, mp) struct isa_device *isdp; u_int *mp; { config_isadev_c(isdp, mp, 0); } void reconfig_isadev(isdp, mp) struct isa_device *isdp; u_int *mp; { config_isadev_c(isdp, mp, 1); } static void config_isadev_c(isdp, mp, reconfig) struct isa_device *isdp; u_int *mp; int reconfig; { u_int checkbits; int id_alive; int last_alive; struct isa_driver *dp = isdp->id_driver; checkbits = 0; #ifndef ALLOW_CONFLICT_DRQ checkbits |= CC_DRQ; #endif #ifndef ALLOW_CONFLICT_IOADDR checkbits |= CC_IOADDR; #endif #ifndef ALLOW_CONFLICT_MEMADDR checkbits |= CC_MEMADDR; #endif if (!isdp->id_enabled) { printf("%s%d: disabled, not probed.\n", dp->name, isdp->id_unit); return; } if (!reconfig && haveseen_isadev(isdp, checkbits)) return; if (!reconfig && isdp->id_maddr) { isdp->id_maddr -= 0xa0000; /* XXX should be a define */ isdp->id_maddr += atdevbase; } if (reconfig) { last_alive = isdp->id_alive; isdp->id_reconfig = 1; } else { last_alive = 0; isdp->id_reconfig = 0; } id_alive = (*dp->probe)(isdp); if (id_alive) { /* * Only print the I/O address range if id_alive != -1 * Right now this is a temporary fix just for the new * NPX code so that if it finds a 486 that can use trap * 16 it will not report I/O addresses. * Rod Grimes 04/26/94 */ if (!isdp->id_reconfig) { printf("%s%d", dp->name, isdp->id_unit); if (id_alive != -1) { printf(" at 0x%x", isdp->id_iobase); if ((isdp->id_iobase + id_alive - 1) != isdp->id_iobase) { printf("-0x%x", isdp->id_iobase + id_alive - 1); } } if (isdp->id_irq) printf(" irq %d", ffs(isdp->id_irq) - 1); if (isdp->id_drq != -1) printf(" drq %d", isdp->id_drq); if (isdp->id_maddr) printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); if (isdp->id_msize) printf(" msize %d", isdp->id_msize); if (isdp->id_flags) printf(" flags 0x%x", isdp->id_flags); if (isdp->id_iobase) { if (!(isdp->id_iobase & 0xf300)) { printf(" on motherboard\n"); } else if (isdp->id_iobase >= 0x1000 && !(isdp->id_iobase & 0x300)) { printf (" on eisa slot %d\n", isdp->id_iobase >> 12); } else { printf (" on isa\n"); } } /* * Check for conflicts again. The driver may have * changed *dvp. We should weaken the early check * since the driver may have been able to change * *dvp to avoid conflicts if given a chance. We * already skip the early check for IRQs and force * a check for IRQs in the next group of checks. */ #ifndef ALLOW_CONFLICT_IRQ checkbits |= CC_IRQ; #endif if (haveseen_isadev(isdp, checkbits)) return; isdp->id_alive = id_alive; } (*dp->attach)(isdp); if (isdp->id_irq) { if (mp) INTRMASK(*mp, isdp->id_irq); register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, isdp->id_ri_flags, isdp->id_intr, mp, isdp->id_unit); INTREN(isdp->id_irq); } } else { if (isdp->id_reconfig) { (*dp->attach)(isdp); /* reconfiguration attach */ } if (!last_alive) { if (!isdp->id_reconfig) { printf("%s%d not found", dp->name, isdp->id_unit); if (isdp->id_iobase) { printf(" at 0x%x", isdp->id_iobase); } printf("\n"); } } else { /* This code has not been tested.... */ if (isdp->id_irq) { INTRDIS(isdp->id_irq); unregister_intr(ffs(isdp->id_irq) - 1, isdp->id_intr); if (mp) INTRUNMASK(*mp, isdp->id_irq); } } } } /* * Provide ISA-specific device information to user programs using the * hw.devconf interface. */ int isa_externalize(struct isa_device *id, void *userp, size_t *maxlen) { if(*maxlen < sizeof *id) { return ENOMEM; } *maxlen -= sizeof *id; return copyout(id, userp, sizeof *id); } /* * Do the same thing for EISA information. EISA information is currently * the same as ISA information plus a slot number, but could be extended in * the future. */ int eisa_externalize(struct isa_device *id, int slot, void *userp, size_t *maxlen) { int rv; if(*maxlen < (sizeof *id) + (sizeof slot)) { return ENOMEM; } *maxlen -= (sizeof *id) + (sizeof slot); rv = copyout(id, userp, sizeof *id); if(rv) return rv; return copyout(&slot, (char *)userp + sizeof *id, sizeof slot); } /* * This is used to forcibly reconfigure an ISA device. It currently just * returns an error 'cos you can't do that yet. It is here to demonstrate * what the `internalize' routine is supposed to do. */ int isa_internalize(struct isa_device *id, void **userpp, size_t *len) { struct isa_device myid; char *userp = *userpp; int rv; if(*len < sizeof *id) { return EINVAL; } rv = copyin(userp, &myid, sizeof myid); if(rv) return rv; *userpp = userp + sizeof myid; *len -= sizeof myid; rv = EOPNOTSUPP; /* code would go here to validate the configuration request */ /* code would go here to actually perform the reconfiguration */ return rv; } int isa_generic_externalize(struct proc *p, struct kern_devconf *kdc, void *userp, size_t l) { return isa_externalize(kdc->kdc_isa, userp, &l); } int eisa_generic_externalize(struct proc *p, struct kern_devconf *kdc, void *userp, size_t l) { return eisa_externalize(kdc->kdc_isa, -1, userp, &l); } /* * Fill in default interrupt table (in case of spuruious interrupt * during configuration of kernel, setup interrupt control unit */ void isa_defaultirq() { int i; /* icu vectors */ for (i = 0; i < ICU_LEN; i++) unregister_intr(i, (inthand2_t *)NULL); /* initialize 8259's */ outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ #ifdef AUTO_EOI_1 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ #else outb(IO_ICU1+1, 1); /* 8086 mode */ #endif outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ outb(IO_ICU1, 0x0a); /* default to IRR on read */ outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ outb(IO_ICU2+1,2); /* my slave id is 2 */ #ifdef AUTO_EOI_2 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ #else outb(IO_ICU2+1,1); /* 8086 mode */ #endif outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ outb(IO_ICU2, 0x0a); /* default to IRR on read */ } /* region of physical memory known to be contiguous */ vm_offset_t isaphysmem; static caddr_t dma_bounce[8]; /* XXX */ static char bounced[8]; /* XXX */ #define MAXDMASZ 512 /* XXX */ /* high byte of address is stored in this port for i-th dma channel */ static short dmapageport[8] = { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; /* * isa_dmacascade(): program 8237 DMA controller channel to accept * external dma control by a board. */ void isa_dmacascade(unsigned chan) { if (chan > 7) panic("isa_dmacascade: impossible request"); /* set dma channel mode, and set dma channel mode */ if ((chan & 4) == 0) { outb(DMA1_MODE, DMA37MD_CASCADE | chan); outb(DMA1_SMSK, chan); } else { outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); outb(DMA2_SMSK, chan & 3); } } static int isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); /* * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment * problems by using a bounce buffer. */ void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) { vm_offset_t phys; int waport; caddr_t newaddr; if ( chan > 7 || (chan < 4 && nbytes > (1<<16)) || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) panic("isa_dmastart: impossible request"); if (isa_dmarangecheck(addr, nbytes, chan)) { if (dma_bounce[chan] == 0) dma_bounce[chan] = /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ (caddr_t) isaphysmem + NBPG*chan; bounced[chan] = 1; newaddr = dma_bounce[chan]; *(int *) newaddr = 0; /* XXX */ /* copy bounce buffer on write */ if (!(flags & B_READ)) bcopy(addr, newaddr, nbytes); addr = newaddr; } /* translate to physical */ phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); if ((chan & 4) == 0) { /* * Program one of DMA channels 0..3. These are * byte mode channels. */ /* set dma channel mode, and reset address ff */ /* If B_RAW flag is set, then use autoinitialise mode */ if (flags & B_RAW) { if (flags & B_READ) outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); else outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); } else if (flags & B_READ) outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); else outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); outb(DMA1_FFC, 0); /* send start address */ waport = DMA1_CHN(chan); outb(waport, phys); outb(waport, phys>>8); outb(dmapageport[chan], phys>>16); /* send count */ outb(waport + 1, --nbytes); outb(waport + 1, nbytes>>8); /* unmask channel */ outb(DMA1_SMSK, chan); } else { /* * Program one of DMA channels 4..7. These are * word mode channels. */ /* set dma channel mode, and reset address ff */ /* If B_RAW flag is set, then use autoinitialise mode */ if (flags & B_RAW) { if (flags & B_READ) outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); else outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); } else if (flags & B_READ) outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); else outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); outb(DMA2_FFC, 0); /* send start address */ waport = DMA2_CHN(chan - 4); outb(waport, phys>>1); outb(waport, phys>>9); outb(dmapageport[chan], phys>>16); /* send count */ nbytes >>= 1; outb(waport + 2, --nbytes); outb(waport + 2, nbytes>>8); /* unmask channel */ outb(DMA2_SMSK, chan & 3); } } void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) { /* copy bounce buffer on read */ /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ if (bounced[chan]) { bcopy(dma_bounce[chan], addr, nbytes); bounced[chan] = 0; } } /* * Check for problems with the address range of a DMA transfer * (non-contiguous physical pages, outside of bus address space, * crossing DMA page boundaries). * Return true if special handling needed. */ static int isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { vm_offset_t phys, priorpage = 0, endva; u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); endva = (vm_offset_t)round_page(va + length); for (; va < (caddr_t) endva ; va += NBPG) { phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); #define ISARAM_END RAM_END if (phys == 0) panic("isa_dmacheck: no physical page present"); if (phys >= ISARAM_END) return (1); if (priorpage) { if (priorpage + NBPG != phys) return (1); /* check if crossing a DMA page boundary */ if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) return (1); } priorpage = phys; } return (0); } /* head of queue waiting for physmem to become available */ struct buf isa_physmemq; /* blocked waiting for resource to become free for exclusive use */ static isaphysmemflag; /* if waited for and call requested when free (B_CALL) */ static void (*isaphysmemunblock)(); /* needs to be a list */ /* * Allocate contiguous physical memory for transfer, returning * a *virtual* address to region. May block waiting for resource. * (assumed to be called at splbio()) */ caddr_t isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { isaphysmemunblock = func; while (isaphysmemflag & B_BUSY) { isaphysmemflag |= B_WANTED; tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); } isaphysmemflag |= B_BUSY; return((caddr_t)isaphysmem); } /* * Free contiguous physical memory used for transfer. * (assumed to be called at splbio()) */ void isa_freephysmem(caddr_t va, unsigned length) { isaphysmemflag &= ~B_BUSY; if (isaphysmemflag & B_WANTED) { isaphysmemflag &= B_WANTED; wakeup((caddr_t)&isaphysmemflag); if (isaphysmemunblock) (*isaphysmemunblock)(); } } #define NMI_PARITY (1 << 7) #define NMI_IOCHAN (1 << 6) #define ENMI_WATCHDOG (1 << 7) #define ENMI_BUSTIMER (1 << 6) #define ENMI_IOSTATUS (1 << 5) /* * Handle a NMI, possibly a machine check. * return true to panic system, false to ignore. */ int isa_nmi(cd) int cd; { int isa_port = inb(0x61); int eisa_port = inb(0x461); if(isa_port & NMI_PARITY) { panic("RAM parity error, likely hardware failure."); } else if(isa_port & NMI_IOCHAN) { panic("I/O channel check, likely hardware failure."); } else if(eisa_port & ENMI_WATCHDOG) { panic("EISA watchdog timer expired, likely hardware failure."); } else if(eisa_port & ENMI_BUSTIMER) { panic("EISA bus timeout, likely hardware failure."); } else if(eisa_port & ENMI_IOSTATUS) { panic("EISA I/O port status error."); } else { printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); return(0); } } /* * Caught a stray interrupt, notify */ static void isa_strayintr(d) int d; { /* DON'T BOTHER FOR NOW! */ /* for some reason, we get bursts of intr #7, even if not enabled! */ /* * Well the reason you got bursts of intr #7 is because someone * raised an interrupt line and dropped it before the 8259 could * prioritize it. This is documented in the intel data book. This * means you have BAD hardware! I have changed this so that only * the first 5 get logged, then it quits logging them, and puts * out a special message. rgrimes 3/25/1993 */ /* * XXX TODO print a different message for #7 if it is for a * glitch. Glitches can be distinguished from real #7's by * testing that the in-service bit is _not_ set. The test * must be done before sending an EOI so it can't be done if * we are using AUTO_EOI_1. */ if (intrcnt[NR_DEVICES + d] <= 5) log(LOG_ERR, "stray irq %d\n", d); if (intrcnt[NR_DEVICES + d] == 5) log(LOG_CRIT, "too many stray irq %d's; not logging any more\n", d); } /* * find an ISA device in a given isa_devtab_* table, given * the table to search, the expected id_driver entry, and the unit number. * * this function is defined in isa_device.h, and this location is debatable; * i put it there because it's useless w/o, and directly operates on * the other stuff in that file. * */ struct isa_device *find_isadev(table, driverp, unit) struct isa_device *table; struct isa_driver *driverp; int unit; { if (driverp == NULL) /* sanity check */ return NULL; while ((table->id_driver != driverp) || (table->id_unit != unit)) { if (table->id_driver == 0) return NULL; table++; } return table; } /* * Return nonzero if a (masked) irq is pending for a given device. */ int isa_irq_pending(dvp) struct isa_device *dvp; { unsigned id_irq; id_irq = dvp->id_irq; if (id_irq & 0xff) return (inb(IO_ICU1) & id_irq); return (inb(IO_ICU2) & (id_irq >> 8)); } int register_intr(intr, device_id, flags, handler, maskptr, unit) int intr; int device_id; u_int flags; inthand2_t *handler; u_int *maskptr; int unit; { char *cp; u_long ef; int id; u_int mask = (maskptr ? *maskptr : 0); if ((u_int)intr >= ICU_LEN || intr == 2 || (u_int)device_id >= NR_DEVICES) return (EINVAL); if (intr_handler[intr] != isa_strayintr) return (EBUSY); ef = read_eflags(); disable_intr(); intr_countp[intr] = &intrcnt[device_id]; intr_handler[intr] = handler; intr_mask[intr] = mask | (1 << intr); intr_unit[intr] = unit; setidt(ICU_OFFSET + intr, flags & RI_FAST ? fastintr[intr] : slowintr[intr], SDT_SYS386IGT, SEL_KPL); write_eflags(ef); for (cp = intrnames, id = 0; id <= device_id; id++) while (*cp++ != '\0') ; if (cp > eintrnames) return (0); if (intr < 10) { cp[-3] = intr + '0'; cp[-2] = ' '; } else { cp[-3] = '1'; cp[-2] = intr - 10 + '0'; } return (0); } static void register_imask(dvp, mask) struct isa_device *dvp; u_int mask; { if (dvp->id_alive && dvp->id_irq) { int intr; intr = ffs(dvp->id_irq) - 1; intr_mask[intr] = mask | (1 <= ICU_LEN || handler != intr_handler[intr]) return (EINVAL); ef = read_eflags(); disable_intr(); intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; intr_handler[intr] = isa_strayintr; intr_mask[intr] = HWI_MASK | SWI_MASK; intr_unit[intr] = intr; setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); write_eflags(ef); return (0); }