Allow access to the PROM via /dev/kmem (like the sparc port)
This commit is contained in:
gwr
parent
344b3cf532
commit
da2622290c
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@ -1,4 +1,4 @@
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/* $NetBSD: mem.c,v 1.3 1997/02/02 08:39:55 thorpej Exp $ */
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/* $NetBSD: mem.c,v 1.4 1997/03/05 23:02:29 gwr Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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@ -61,12 +61,17 @@
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#include <machine/pte.h>
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#include <machine/pmap.h>
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#include <machine/machdep.h>
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#include <machine/mon.h>
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/* XXX - Put this in pmap_pvt.h or something? */
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extern vm_offset_t avail_start;
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#define mmread mmrw
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cdev_decl(mm);
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static int promacc __P((caddr_t, int, int));
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static caddr_t devzeropage;
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/*ARGSUSED*/
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int
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mmopen(dev, flag, mode, p)
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@ -96,9 +101,9 @@ mmrw(dev, uio, flags)
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struct uio *uio;
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int flags;
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{
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register vm_offset_t o, v;
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register int c;
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register struct iovec *iov;
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register vm_offset_t o, v;
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register int c, rw;
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int error = 0;
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static int physlock;
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@ -126,47 +131,63 @@ mmrw(dev, uio, flags)
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}
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switch (minor(dev)) {
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/* minor device 0 is physical memory */
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case 0:
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case 0: /* /dev/mem */
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v = uio->uio_offset;
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/* allow reads only in RAM */
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if (!pmap_pa_exists(v)) {
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error = EFAULT;
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goto unlock;
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}
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/*
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* If the offset (physical address) is within the
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* linearly mapped range (0 .. avail_start) then
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* we can save some hair by using the /dev/kmem
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* alias mapping known to exist for this range.
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*/
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if (v < avail_start) {
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v += KERNBASE;
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goto use_kmem;
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}
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/* Temporarily map the memory at vmmap. */
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pmap_enter(pmap_kernel(), vmmap,
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trunc_page(v), uio->uio_rw == UIO_READ ?
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VM_PROT_READ : VM_PROT_WRITE, TRUE);
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o = uio->uio_offset & PGOFSET;
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o = v & PGOFSET;
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c = min(uio->uio_resid, (int)(NBPG - o));
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error = uiomove((caddr_t)vmmap + o, c, uio);
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pmap_remove(pmap_kernel(), vmmap, vmmap + NBPG);
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continue;
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/* minor device 1 is kernel memory */
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/* XXX - Allow access to the PROM? */
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case 1:
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case 1: /* /dev/kmem */
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v = uio->uio_offset;
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c = min(iov->iov_len, MAXPHYS);
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if (!kernacc((caddr_t)v, c,
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uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
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return (EFAULT);
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use_kmem:
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/*
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* One page at a time to simplify access checks.
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* Note that we can get here from case 0 above!
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*/
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o = v & PGOFSET;
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c = min(uio->uio_resid, (int)(NBPG - o));
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rw = (uio->uio_rw == UIO_READ) ? B_READ : B_WRITE;
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if (!(kernacc((caddr_t)v, c, rw) ||
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promacc((caddr_t)v, c, rw)))
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{
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error = EFAULT;
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/* Note: case 0 can get here, so must unlock! */
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goto unlock;
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}
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error = uiomove((caddr_t)v, c, uio);
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continue;
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/* minor device 2 is EOF/RATHOLE */
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case 2:
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case 2: /* /dev/null */
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if (uio->uio_rw == UIO_WRITE)
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uio->uio_resid = 0;
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return (0);
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/* minor device 11 (/dev/eeprom) accesses Non-Volatile RAM */
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case 11:
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case 11: /* /dev/eeprom */
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error = eeprom_uio(uio);
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return (error);
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/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
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case 12:
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case 12: /* /dev/zero */
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if (uio->uio_rw == UIO_WRITE) {
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c = iov->iov_len;
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break;
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@ -227,7 +248,7 @@ mmmmap(dev, off, prot)
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case 0: /* dev/mem */
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/* Allow access only in valid memory. */
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if (!pmap_pa_exists(v))
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return (-1);
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break;
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return (v);
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#if 0 /* XXX - NOTYET */
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@ -262,3 +283,34 @@ mmmmap(dev, off, prot)
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return (-1);
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}
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/*
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* Just like kernacc(), but for the PROM mappings.
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* Return non-zero if access at VA is allowed.
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*/
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static int
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promacc(va, len, rw)
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caddr_t va;
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int len, rw;
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{
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vm_offset_t sva, eva;
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sva = (vm_offset_t)va;
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eva = (vm_offset_t)va + len;
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/* Test for the most common case first. */
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if (sva < PROM_BASE)
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return (0);
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/* Read in the PROM itself is OK. */
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if ((rw == B_READ) && (eva <= MONEND))
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return (1);
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/* PROM data page is OK for read/write. */
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if ((sva >= MONDATA) && (eva <= (MONDATA+NBPG)))
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return (1);
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/* otherwise, not OK to touch */
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return (0);
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}
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@ -1,4 +1,4 @@
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/* $NetBSD: mem.c,v 1.3 1997/02/02 08:39:55 thorpej Exp $ */
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/* $NetBSD: mem.c,v 1.4 1997/03/05 23:02:29 gwr Exp $ */
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/*
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* Copyright (c) 1988 University of Utah.
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@ -61,12 +61,17 @@
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#include <machine/pte.h>
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#include <machine/pmap.h>
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#include <machine/machdep.h>
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#include <machine/mon.h>
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/* XXX - Put this in pmap_pvt.h or something? */
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extern vm_offset_t avail_start;
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#define mmread mmrw
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cdev_decl(mm);
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static int promacc __P((caddr_t, int, int));
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static caddr_t devzeropage;
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/*ARGSUSED*/
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int
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mmopen(dev, flag, mode, p)
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@ -96,9 +101,9 @@ mmrw(dev, uio, flags)
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struct uio *uio;
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int flags;
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{
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register vm_offset_t o, v;
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register int c;
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register struct iovec *iov;
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register vm_offset_t o, v;
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register int c, rw;
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int error = 0;
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static int physlock;
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@ -126,47 +131,63 @@ mmrw(dev, uio, flags)
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}
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switch (minor(dev)) {
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/* minor device 0 is physical memory */
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case 0:
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case 0: /* /dev/mem */
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v = uio->uio_offset;
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/* allow reads only in RAM */
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if (!pmap_pa_exists(v)) {
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error = EFAULT;
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goto unlock;
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}
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/*
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* If the offset (physical address) is within the
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* linearly mapped range (0 .. avail_start) then
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* we can save some hair by using the /dev/kmem
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* alias mapping known to exist for this range.
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*/
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if (v < avail_start) {
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v += KERNBASE;
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goto use_kmem;
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}
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/* Temporarily map the memory at vmmap. */
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pmap_enter(pmap_kernel(), vmmap,
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trunc_page(v), uio->uio_rw == UIO_READ ?
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VM_PROT_READ : VM_PROT_WRITE, TRUE);
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o = uio->uio_offset & PGOFSET;
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o = v & PGOFSET;
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c = min(uio->uio_resid, (int)(NBPG - o));
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error = uiomove((caddr_t)vmmap + o, c, uio);
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pmap_remove(pmap_kernel(), vmmap, vmmap + NBPG);
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continue;
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/* minor device 1 is kernel memory */
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/* XXX - Allow access to the PROM? */
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case 1:
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case 1: /* /dev/kmem */
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v = uio->uio_offset;
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c = min(iov->iov_len, MAXPHYS);
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if (!kernacc((caddr_t)v, c,
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uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
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return (EFAULT);
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use_kmem:
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/*
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* One page at a time to simplify access checks.
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* Note that we can get here from case 0 above!
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*/
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o = v & PGOFSET;
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c = min(uio->uio_resid, (int)(NBPG - o));
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rw = (uio->uio_rw == UIO_READ) ? B_READ : B_WRITE;
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if (!(kernacc((caddr_t)v, c, rw) ||
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promacc((caddr_t)v, c, rw)))
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{
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error = EFAULT;
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/* Note: case 0 can get here, so must unlock! */
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goto unlock;
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}
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error = uiomove((caddr_t)v, c, uio);
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continue;
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/* minor device 2 is EOF/RATHOLE */
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case 2:
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case 2: /* /dev/null */
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if (uio->uio_rw == UIO_WRITE)
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uio->uio_resid = 0;
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return (0);
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/* minor device 11 (/dev/eeprom) accesses Non-Volatile RAM */
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case 11:
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case 11: /* /dev/eeprom */
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error = eeprom_uio(uio);
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return (error);
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/* minor device 12 (/dev/zero) is source of nulls on read, rathole on write */
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case 12:
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case 12: /* /dev/zero */
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if (uio->uio_rw == UIO_WRITE) {
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c = iov->iov_len;
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break;
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@ -227,7 +248,7 @@ mmmmap(dev, off, prot)
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case 0: /* dev/mem */
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/* Allow access only in valid memory. */
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if (!pmap_pa_exists(v))
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return (-1);
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break;
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return (v);
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#if 0 /* XXX - NOTYET */
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@ -262,3 +283,34 @@ mmmmap(dev, off, prot)
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return (-1);
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}
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/*
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* Just like kernacc(), but for the PROM mappings.
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* Return non-zero if access at VA is allowed.
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*/
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static int
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promacc(va, len, rw)
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caddr_t va;
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int len, rw;
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{
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vm_offset_t sva, eva;
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sva = (vm_offset_t)va;
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eva = (vm_offset_t)va + len;
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/* Test for the most common case first. */
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if (sva < PROM_BASE)
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return (0);
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/* Read in the PROM itself is OK. */
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if ((rw == B_READ) && (eva <= MONEND))
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return (1);
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/* PROM data page is OK for read/write. */
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if ((sva >= MONDATA) && (eva <= (MONDATA+NBPG)))
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return (1);
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/* otherwise, not OK to touch */
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return (0);
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}
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