--- /dev/null
+/*
+ * Copyright (c) 1988 University of Utah.
+ * Copyright (c) 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. 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: vn.c 1.13 94/04/02
+ *
+ * from: @(#)vn.c 8.6 (Berkeley) 4/1/94
+ * $FreeBSD: src/sys/dev/vn/vn.c,v 1.105.2.4 2001/11/18 07:11:00 dillon Exp $
+ */
+
+/*
+ * RAM disk driver.
+ *
+ * Block interface to a ramdisk.
+ *
+ */
+
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/proc.h>
+#include <sys/buf.h>
+#include <sys/malloc.h>
+#include <sys/mount.h>
+#include <sys/vnode.h>
+#include <sys/fcntl.h>
+#include <sys/conf.h>
+#include <sys/disk.h>
+#include <sys/stat.h>
+
+#include <sys/vm.h>
+
+#include <vm/vm_pager.h>
+#include <vm/vm_pageout.h>
+#include <mach/memory_object_types.h>
+
+#include <miscfs/devfs/devfs.h>
+
+static open_close_fcn_t mdevopen;
+static open_close_fcn_t mdevclose;
+static psize_fcn_t mdevsize;
+static strategy_fcn_t mdevstrategy;
+static int mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
+static int mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p);
+static int mdevrw(dev_t dev, struct uio *uio, int ioflag);
+static char *nonspace(char *pos, char *end);
+static char *getspace(char *pos, char *end);
+static char *cvtnum(char *pos, char *end, unsigned int *num);
+
+/*
+ * cdevsw
+ * D_DISK we want to look like a disk
+ * D_CANFREE We support B_FREEBUF
+ */
+
+static struct bdevsw mdevbdevsw = {
+ /* open */ mdevopen,
+ /* close */ mdevclose,
+ /* strategy */ mdevstrategy,
+ /* ioctl */ mdevbioctl,
+ /* dump */ eno_dump,
+ /* psize */ mdevsize,
+ /* flags */ D_DISK,
+};
+
+static struct cdevsw mdevcdevsw = {
+ /* open */ mdevopen,
+ /* close */ mdevclose,
+ /* read */ mdevrw,
+ /* write */ mdevrw,
+ /* ioctl */ mdevcioctl,
+ /* stop */ eno_stop,
+ /* reset */ eno_reset,
+ /* ttys */ 0,
+ /* select */ eno_select,
+ /* mmap */ eno_mmap,
+ /* strategy */ eno_strat,
+ /* getc */ eno_getc,
+ /* putc */ eno_putc,
+ /* flags */ D_DISK,
+};
+
+struct mdev {
+ vm_offset_t mdBase; /* file size in bytes */
+ uint32_t mdSize; /* file size in bytes */
+ int mdFlags; /* flags */
+ int mdSecsize; /* sector size */
+ int mdBDev; /* Block device number */
+ int mdCDev; /* Character device number */
+ void * mdbdevb;
+ void * mdcdevb;
+} mdev[16];
+
+/* mdFlags */
+#define mdInited 0x01 /* This device defined */
+#define mdRO 0x02 /* This device is read-only */
+#define mdPhys 0x04 /* This device is in physical memory */
+
+int mdevBMajor = -1;
+int mdevCMajor = -1;
+
+static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p, int is_char);
+dev_t mdevadd(int devid, ppnum_t base, unsigned int size, int phys);
+dev_t mdevlookup(int devid);
+
+static int mdevclose(dev_t dev, int flags, int devtype, struct proc *p) {
+ return (0);
+}
+
+static int mdevopen(dev_t dev, int flags, int devtype, struct proc *p) {
+
+ int devid;
+
+ devid = minor(dev); /* Get minor device number */
+
+ if (devid > 16) return (ENXIO); /* Not valid */
+
+ if ((flags & FWRITE) && (mdev[devid].mdFlags & mdRO)) return (EACCES); /* Currently mounted RO */
+
+ return(0);
+}
+
+static int mdevrw(dev_t dev, struct uio *uio, int ioflag) {
+ int status;
+ int unit;
+ addr64_t mdata;
+ int devid;
+ enum uio_seg saveflag;
+
+ devid = minor(dev); /* Get minor device number */
+
+ if (devid > 16) return (ENXIO); /* Not valid */
+ if (!(mdev[devid].mdFlags & mdInited)) return (ENXIO); /* Have we actually been defined yet? */
+
+ mdata = ((addr64_t)mdev[devid].mdBase << 12) + uio->uio_offset; /* Point to the area in "file" */
+
+ saveflag = uio->uio_segflg; /* Remember what the request is */
+ if (mdev[devid].mdFlags & mdPhys) uio->uio_segflg = UIO_PHYS_USERSPACE; /* Make sure we are moving from physical ram if physical device */
+ status = uiomove64(mdata, uio->uio_resid, uio); /* Move the data */
+ uio->uio_segflg = saveflag; /* Restore the flag */
+
+ return (status);
+}
+
+static void mdevstrategy(struct buf *bp) {
+ int unmap;
+ unsigned int sz, left, lop, csize;
+ kern_return_t ret;
+ vm_offset_t vaddr, blkoff;
+ struct buf *tbuf;
+ int devid;
+ addr64_t paddr, fvaddr;
+ ppnum_t pp;
+
+ devid = minor(bp->b_dev); /* Get minor device number */
+
+ if ((mdev[devid].mdFlags & mdInited) == 0) { /* Have we actually been defined yet? */
+ bp->b_error = ENXIO;
+ bp->b_flags |= B_ERROR;
+ biodone(bp);
+ return;
+ }
+
+ bp->b_resid = bp->b_bcount; /* Set byte count */
+
+ blkoff = bp->b_blkno * mdev[devid].mdSecsize; /* Get offset into file */
+
+/*
+ * Note that reading past end is an error, but reading at end is an EOF. For these
+ * we just return with b_resid == b_bcount.
+ */
+
+ if (blkoff >= (mdev[devid].mdSize << 12)) { /* Are they trying to read/write at/after end? */
+ if(blkoff != (mdev[devid].mdSize << 12)) { /* Are we trying to read after EOF? */
+ bp->b_error = EINVAL; /* Yeah, this is an error */
+ bp->b_flags |= B_ERROR | B_INVAL;
+ }
+ biodone(bp); /* Return */
+ return;
+ }
+
+ if ((blkoff + bp->b_bcount) > (mdev[devid].mdSize << 12)) { /* Will this read go past end? */
+ bp->b_bcount = ((mdev[devid].mdSize << 12) - blkoff); /* Yes, trim to max */
+ }
+
+ vaddr = 0; /* Assume not mapped yet */
+ unmap = 0;
+
+ if (bp->b_flags & B_VECTORLIST) { /* Do we have a list of UPLs? */
+ tbuf = (struct buf *)bp->b_real_bp; /* Get this for C's inadequacies */
+ if((bp->b_flags & B_NEED_IODONE) && /* If we have a UPL, is it already mapped? */
+ tbuf &&
+ tbuf->b_data) {
+ vaddr = (vm_offset_t)tbuf->b_data; /* We already have this mapped in, get base address */
+ }
+ else { /* Not mapped yet */
+ ret = ubc_upl_map(bp->b_pagelist, &vaddr); /* Map it in */
+ if(ret != KERN_SUCCESS) panic("ramstrategy: ubc_upl_map failed, rc = %08X\n", ret);
+ unmap = 1; /* Remember to unmap later */
+ }
+ vaddr = vaddr += bp->b_uploffset; /* Calculate actual vaddr */
+ }
+ else vaddr = (vm_offset_t)bp->b_data; /* No UPL, we already have address */
+
+ fvaddr = (mdev[devid].mdBase << 12) + blkoff; /* Point to offset into ram disk */
+
+ if(bp->b_flags & B_READ) { /* Is this a read? */
+ if(!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
+ bcopy((void *)((uintptr_t)fvaddr),
+ (void *)vaddr, (size_t)bp->b_bcount); /* This is virtual, just get the data */
+ }
+ else {
+ left = bp->b_bcount; /* Init the amount left to copy */
+ while(left) { /* Go until it is all copied */
+
+ lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
+ csize = min(lop, left); /* Don't move more than we need to */
+
+ pp = pmap_find_phys(kernel_pmap, (addr64_t)((unsigned int)vaddr)); /* Get the sink physical address */
+ if(!pp) { /* Not found, what gives? */
+ panic("mdevstrategy: sink address %016llX not mapped\n", (addr64_t)((unsigned int)vaddr));
+ }
+ paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
+ bcopy_phys(fvaddr, paddr, csize); /* Copy this on in */
+ mapping_set_mod(paddr >> 12); /* Make sure we know that it is modified */
+
+ left = left - csize; /* Calculate what is left */
+ vaddr = vaddr + csize; /* Move to next sink address */
+ fvaddr = fvaddr + csize; /* Bump to next physical address */
+ }
+ }
+ }
+ else { /* This is a write */
+ if(!(mdev[devid].mdFlags & mdPhys)) { /* Physical mapped disk? */
+ bcopy((void *)vaddr, (void *)((uintptr_t)fvaddr),
+ (size_t)bp->b_bcount); /* This is virtual, just put the data */
+ }
+ else {
+ left = bp->b_bcount; /* Init the amount left to copy */
+ while(left) { /* Go until it is all copied */
+
+ lop = min((4096 - (vaddr & 4095)), (4096 - (fvaddr & 4095))); /* Get smallest amount left on sink and source */
+ csize = min(lop, left); /* Don't move more than we need to */
+
+ pp = pmap_find_phys(kernel_pmap, (addr64_t)((unsigned int)vaddr)); /* Get the source physical address */
+ if(!pp) { /* Not found, what gives? */
+ panic("mdevstrategy: source address %016llX not mapped\n", (addr64_t)((unsigned int)vaddr));
+ }
+ paddr = (addr64_t)(((addr64_t)pp << 12) | (addr64_t)(vaddr & 4095)); /* Get actual address */
+
+ bcopy_phys(paddr, fvaddr, csize); /* Move this on out */
+
+ left = left - csize; /* Calculate what is left */
+ vaddr = vaddr + csize; /* Move to next sink address */
+ fvaddr = fvaddr + csize; /* Bump to next physical address */
+ }
+ }
+ }
+
+ if (unmap) { /* Do we need to unmap this? */
+ ubc_upl_unmap(bp->b_pagelist); /* Yes, unmap it */
+ }
+
+ bp->b_resid = 0; /* Nothing more to do */
+ biodone(bp); /* Say we've finished */
+}
+
+static int mdevbioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) {
+ return (mdevioctl(dev, cmd, data, flag, p, 0));
+}
+
+static int mdevcioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p) {
+ return (mdevioctl(dev, cmd, data, flag, p, 1));
+}
+
+static int mdevioctl(dev_t dev, u_long cmd, caddr_t data, int flag, struct proc *p, int is_char) {
+
+ int error;
+ u_long *f;
+ u_int64_t *o;
+ int devid;
+
+ devid = minor(dev); /* Get minor device number */
+
+ if (devid > 16) return (ENXIO); /* Not valid */
+
+ error = suser(p->p_ucred, &p->p_acflag); /* Are we superman? */
+ if (error) return (error); /* Nope... */
+
+ f = (u_long*)data;
+ o = (u_int64_t *)data;
+
+ switch (cmd) {
+
+ case DKIOCGETMAXBLOCKCOUNTREAD:
+ *o = 32;
+ break;
+
+ case DKIOCGETMAXBLOCKCOUNTWRITE:
+ *o = 32;
+ break;
+
+ case DKIOCGETMAXSEGMENTCOUNTREAD:
+ *o = 32;
+ break;
+
+ case DKIOCGETMAXSEGMENTCOUNTWRITE:
+ *o = 32;
+ break;
+
+ case DKIOCGETBLOCKSIZE:
+ *f = mdev[devid].mdSecsize;
+ break;
+
+ case DKIOCSETBLOCKSIZE:
+ if (is_char) return (ENODEV); /* We can only do this for a block */
+
+ if (*f < DEV_BSIZE) return (EINVAL); /* Too short? */
+
+ mdev[devid].mdSecsize = *f; /* set the new block size */
+ break;
+
+ case DKIOCISWRITABLE:
+ *f = 1;
+ break;
+
+ case DKIOCGETBLOCKCOUNT32:
+ if(!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
+ *f = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
+ break;
+
+ case DKIOCGETBLOCKCOUNT:
+ if(!(mdev[devid].mdFlags & mdInited)) return (ENXIO);
+ *o = ((mdev[devid].mdSize << 12) + mdev[devid].mdSecsize - 1) / mdev[devid].mdSecsize;
+ break;
+
+ default:
+ error = ENOTTY;
+ break;
+ }
+ return(error);
+}
+
+
+static int mdevsize(dev_t dev) {
+
+ int devid;
+
+ devid = minor(dev); /* Get minor device number */
+ if (devid > 16) return (ENXIO); /* Not valid */
+
+ if ((mdev[devid].mdFlags & mdInited) == 0) return(-1); /* Not inited yet */
+
+ return(mdev[devid].mdSecsize);
+}
+
+#include <pexpert/pexpert.h>
+
+void mdevinit(int cnt) {
+
+ int devid, phys;
+ ppnum_t base;
+ unsigned int size;
+ char *ba, *lp;
+ dev_t dev;
+
+
+ ba = PE_boot_args(); /* Get the boot arguments */
+ lp = ba + 256; /* Point to the end */
+
+ while(1) { /* Step through, looking for our keywords */
+ phys = 0; /* Assume virtual memory device */
+ ba = nonspace(ba, lp); /* Find non-space */
+ if(ba >= lp) return; /* We are done if no more... */
+ if(((ba[0] != 'v') && (ba[0] != 'p'))
+ || (ba[1] != 'm') || (ba[2] != 'd') || (ba[4] != '=')
+ || (ba[3] < '0') || (ba[3] > 'f')
+ || ((ba[3] > '9') && (ba[3] < 'a'))) { /* Is this of form "vmdx=" or "pmdx=" where x is hex digit? */
+
+ ba = getspace(ba, lp); /* Find next white space or end */
+ continue; /* Start looking for the next one */
+ }
+
+ if(ba[0] == 'p') phys = 1; /* Set physical memory disk */
+
+ devid = ba[3] & 0xF; /* Assume digit */
+ if(ba[3] > '9') devid += 9; /* Adjust for hex digits */
+
+ ba = &ba[5]; /* Step past keyword */
+ ba = cvtnum(ba, lp, &base); /* Convert base of memory disk */
+ if(ba >= lp) return; /* Malformed one at the end, leave */
+ if(ba[0] != '.') continue; /* If not length separater, try next... */
+ if(base & 0xFFF) continue; /* Only allow page aligned stuff */
+
+ ba++; /* Step past '.' */
+ ba = cvtnum(ba, lp, &size); /* Try to convert it */
+ if(!size || (size & 0xFFF)) continue; /* Allow only non-zer page size multiples */
+ if(ba < lp) { /* If we are not at end, check end character */
+ if((ba[0] != ' ') && (ba[0] != 0)) continue; /* End must be null or space */
+ }
+
+ dev = mdevadd(devid, base >> 12, size >> 12, phys); /* Go add the device */
+ }
+
+ return;
+
+}
+
+char *nonspace(char *pos, char *end) { /* Find next non-space in string */
+
+ if(pos >= end) return end; /* Don't go past end */
+ if(pos[0] == 0) return end; /* If at null, make end */
+
+ while(1) { /* Keep going */
+ if(pos[0] != ' ') return pos; /* Leave if we found one */
+ pos++; /* Stop */
+ if(pos >= end) return end; /* Quit if we run off end */
+ }
+}
+
+char *getspace(char *pos, char *end) { /* Find next non-space in string */
+
+ while(1) { /* Keep going */
+ if(pos >= end) return end; /* Don't go past end */
+ if(pos[0] == 0) return end; /* Leave if we hit null */
+ if(pos[0] == ' ') return pos; /* Leave if we found one */
+ pos++; /* Stop */
+ }
+}
+
+char *cvtnum(char *pos, char *end, unsigned int *num) { /* Convert to a number */
+
+ int rad, dig;
+
+ *num = 0; /* Set answer to 0 to start */
+ rad = 10;
+
+ if(pos >= end) return end; /* Don't go past end */
+ if(pos[0] == 0) return end; /* If at null, make end */
+
+ if(pos[0] == '0' && ((pos[1] == 'x') || (pos[1] == 'x'))) { /* A hex constant? */
+ rad = 16;
+ pos += 2; /* Point to the number */
+ }
+
+ while(1) { /* Convert it */
+
+ if(pos >= end) return end; /* Don't go past end */
+ if(pos[0] == 0) return end; /* If at null, make end */
+ if(pos[0] < '0') return pos; /* Leave if non-digit */
+ dig = pos[0] & 0xF; /* Extract digit */
+ if(pos[0] > '9') { /* Is it bigger than 9? */
+ if(rad == 10) return pos; /* Leave if not base 10 */
+ if(!(((pos[0] >= 'A') && (pos[0] <= 'F'))
+ || ((pos[0] >= 'a') && (pos[0] <= 'f')))) return pos; /* Leave if bogus char */
+ dig = dig + 9; /* Adjust for character */
+ }
+ *num = (*num * rad) + dig; /* Accumulate the number */
+ pos++; /* Step on */
+ }
+}
+
+dev_t mdevadd(int devid, ppnum_t base, unsigned int size, int phys) {
+
+ int i;
+
+ if(devid < 0) {
+
+ devid = -1;
+ for(i = 0; i < 16; i++) { /* Search all known memory devices */
+ if(!(mdev[i].mdFlags & mdInited)) { /* Is this a free one? */
+ if(devid < 0)devid = i; /* Remember first free one */
+ continue; /* Skip check */
+ }
+ if(!(((base + size -1 ) < mdev[i].mdBase) || ((mdev[i].mdBase + mdev[i].mdSize - 1) < base))) { /* Is there any overlap? */
+ panic("mdevadd: attempt to add overlapping memory device at %08X-%08X\n", mdev[i].mdBase, mdev[i].mdBase + mdev[i].mdSize - 1);
+ }
+ }
+ if(devid < 0) { /* Do we have free slots? */
+ panic("mdevadd: attempt to add more than 16 memory devices\n");
+ }
+ }
+ else {
+ if(devid >= 16) { /* Giving us something bogus? */
+ panic("mdevadd: attempt to explicitly add a bogus memory device: &08X\n", devid);
+ }
+ if(mdev[devid].mdFlags &mdInited) { /* Already there? */
+ panic("mdevadd: attempt to explicitly add a previously defined memory device: &08X\n", devid);
+ }
+ }
+
+ if(mdevBMajor < 0) { /* Have we gotten a major number yet? */
+ mdevBMajor = bdevsw_add(-1, &mdevbdevsw); /* Add to the table and figure out a major number */
+ if (mdevBMajor < 0) {
+ printf("mdevadd: error - bdevsw_add() returned %d\n", mdevBMajor);
+ return -1;
+ }
+ }
+
+ if(mdevCMajor < 0) { /* Have we gotten a major number yet? */
+ mdevCMajor = cdevsw_add_with_bdev(-1, &mdevcdevsw, mdevBMajor); /* Add to the table and figure out a major number */
+ if (mdevCMajor < 0) {
+ printf("ramdevice_init: error - cdevsw_add() returned %d\n", mdevCMajor);
+ return -1;
+ }
+ }
+
+ mdev[devid].mdBDev = makedev(mdevBMajor, devid); /* Get the device number */
+ mdev[devid].mdbdevb = devfs_make_node(mdev[devid].mdBDev, DEVFS_BLOCK, /* Make the node */
+ UID_ROOT, GID_OPERATOR,
+ 0600, "md%d", devid);
+ if (mdev[devid].mdbdevb == NULL) { /* Did we make one? */
+ printf("mdevadd: devfs_make_node for block failed!\n");
+ return -1; /* Nope... */
+ }
+
+ mdev[devid].mdCDev = makedev(mdevCMajor, devid); /* Get the device number */
+ mdev[devid].mdcdevb = devfs_make_node(mdev[devid].mdCDev, DEVFS_CHAR, /* Make the node */
+ UID_ROOT, GID_OPERATOR,
+ 0600, "rmd%d", devid);
+ if (mdev[devid].mdcdevb == NULL) { /* Did we make one? */
+ printf("mdevadd: devfs_make_node for character failed!\n");
+ return -1; /* Nope... */
+ }
+
+ mdev[devid].mdBase = base; /* Set the base address of ram disk */
+ mdev[devid].mdSize = size; /* Set the length of the ram disk */
+ mdev[devid].mdSecsize = DEV_BSIZE; /* Set starting block size */
+ if(phys) mdev[devid].mdFlags |= mdPhys; /* Show that we are in physical memory */
+ mdev[devid].mdFlags |= mdInited; /* Show we are all set up */
+ printf("Added memory device md%x/rmd%x (%08X/%08X) at %08X for %08X\n",
+ devid, devid, mdev[devid].mdBDev, mdev[devid].mdCDev, base << 12, size << 12);
+ return mdev[devid].mdBDev;
+}
+
+
+dev_t mdevlookup(int devid) {
+
+ if((devid < 0) || (devid > 15)) return -1; /* Filter any bogus requests */
+ if(!(mdev[devid].mdFlags & mdInited)) return -1; /* This one hasn't been defined */
+ return mdev[devid].mdBDev; /* Return the device number */
+}
projects / apple / xnu.git / blobdiff