The ramdisk is now a pseudo-device.
This commit is contained in:
gwr
parent
634f5ade49
commit
daef0ae82a
99
sys/dev/md.c
99
sys/dev/md.c
@ -1,4 +1,4 @@
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/* $NetBSD: md.c,v 1.6 1996/03/17 00:43:52 thorpej Exp $ */
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/* $NetBSD: md.c,v 1.7 1996/03/22 23:02:02 gwr Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross, Leo Weppelman.
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@ -46,6 +46,8 @@
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/device.h>
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@ -74,15 +76,10 @@ extern vm_offset_t kmem_alloc __P((vm_map_t, vm_size_t));
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*
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* XXX Assumption: 16 RAM-disks are enough!
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*/
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#define RD_MAX_UNITS 0x10
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#define RD_IS_CTRL(unit) (unit & 0x10)
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#define RD_UNIT(unit) (unit & 0xF)
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/*
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* XXX - This is just for a sanity check. Only
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* applies to kernel-space RAM disk allocations.
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*/
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#define RD_KMEM_MAX_SIZE 0x100000 /* 1MB */
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/* autoconfig stuff... */
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struct rd_softc {
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@ -100,36 +97,66 @@ struct rd_softc {
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#define RD_ISOPEN 0x01
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#define RD_SERVED 0x02
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static int rd_match (struct device *, void *self, void *);
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static void rd_attach(struct device *, struct device *self, void *);
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struct cfattach rd_ca = {
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sizeof(struct rd_softc), rd_match, rd_attach
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};
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static void rd_attach __P((struct device *, struct device *, void *));
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/*
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* Some ports (like i386) use a swapgeneric that wants to
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* snoop around in this rd_cd structure. It is preserved
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* (for now) to remain compatible with such practice.
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* XXX - that practice is questionable...
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*/
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struct cfdriver rd_cd = {
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NULL, "rd", DV_DULL, NULL, 0
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};
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void rdstrategy __P((struct buf *bp));
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struct dkdriver rddkdriver = { rdstrategy };
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static int
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rd_match(parent, self, aux)
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struct device *parent;
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void *self;
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void *aux;
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static int ramdisk_ndevs;
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static void *ramdisk_devs[RD_MAX_UNITS];
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/*
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* This is called if we are configured as a pseudo-device
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*/
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void
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rdattach(n)
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int n;
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{
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#ifdef RAMDISK_HOOKS
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/*
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* This external function allows for a machine dependent
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* match function.
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*/
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return (rd_match_hook(parent, self, aux));
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#else
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return(1);
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struct rd_softc *sc;
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int i;
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#ifdef DIAGNOSTIC
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if (ramdisk_ndevs) {
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printf("ramdisk: multiple attach calls?\n");
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return;
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}
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#endif
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/* XXX: Are we supposed to provide a default? */
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if (n <= 1)
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n = 1;
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if (n > RD_MAX_UNITS)
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n = RD_MAX_UNITS;
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ramdisk_ndevs = n;
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/* XXX: Fake-up rd_cd (see above) */
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rd_cd.cd_ndevs = ramdisk_ndevs;
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rd_cd.cd_devs = ramdisk_devs;
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/* Attach as if by autoconfig. */
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for (i = 0; i < n; i++) {
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sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK);
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if (!sc) {
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printf("ramdisk: malloc for attach failed!\n");
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return;
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}
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bzero((caddr_t)sc, sizeof(*sc));
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ramdisk_devs[i] = sc;
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sc->sc_dev.dv_unit = i;
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sprintf(sc->sc_dev.dv_xname, "rd%d", i);
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rd_attach(NULL, &sc->sc_dev, NULL);
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}
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}
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static void
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@ -148,12 +175,10 @@ rd_attach(parent, self, aux)
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*/
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rd_attach_hook(sc->sc_dev.dv_unit, &sc->sc_rd);
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#endif
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printf("\n");
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/*
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* Initialize and attach the disk structure.
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*/
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bzero(&sc->sc_dkdev, sizeof(sc->sc_dkdev));
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sc->sc_dkdev.dk_driver = &rddkdriver;
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sc->sc_dkdev.dk_name = sc->sc_dev.dv_xname;
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disk_attach(&sc->sc_dkdev);
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@ -187,9 +212,9 @@ int rdsize(dev_t dev)
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/* Disallow control units. */
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unit = minor(dev);
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if (unit >= rd_cd.cd_ndevs)
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if (unit >= ramdisk_ndevs)
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return 0;
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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if (sc == NULL)
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return 0;
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@ -209,9 +234,9 @@ int rdopen(dev, flag, fmt, proc)
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md = minor(dev);
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unit = RD_UNIT(md);
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if (unit >= rd_cd.cd_ndevs)
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if (unit >= ramdisk_ndevs)
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return ENXIO;
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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if (sc == NULL)
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return ENXIO;
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@ -249,7 +274,7 @@ int rdclose(dev, flag, fmt, proc)
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md = minor(dev);
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unit = RD_UNIT(md);
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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if (RD_IS_CTRL(md))
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return 0;
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@ -291,7 +316,7 @@ rdstrategy(bp)
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md = minor(bp->b_dev);
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unit = RD_UNIT(md);
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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switch (sc->sc_type) {
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#if RAMDISK_SERVER
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@ -353,7 +378,7 @@ rdioctl(dev, cmd, data, flag, proc)
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md = minor(dev);
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unit = RD_UNIT(md);
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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/* If this is not the control device, punt! */
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if (RD_IS_CTRL(md) == 0)
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@ -399,8 +424,6 @@ rd_ioctl_kalloc(sc, urd, proc)
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/* Sanity check the size. */
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size = urd->rd_size;
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if (size > RD_KMEM_MAX_SIZE)
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return EINVAL;
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addr = kmem_alloc(kernel_map, size);
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if (!addr)
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return ENOMEM;
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@ -1,4 +1,4 @@
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/* $NetBSD: md.h,v 1.3 1996/03/07 10:26:31 leo Exp $ */
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/* $NetBSD: md.h,v 1.4 1996/03/22 23:02:04 gwr Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross
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@ -85,7 +85,6 @@ struct rd_conf {
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* called by the ramdisk driver to allow machine-dependent to
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* match/configure and/or load each ramdisk unit.
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*/
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extern int rd_match_hook __P((struct device *, void *, void *));
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extern void rd_attach_hook __P((int unit, struct rd_conf *));
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extern void rd_open_hook __P((int unit, struct rd_conf *));
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#endif
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@ -1,4 +1,4 @@
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/* $NetBSD: ramdisk.c,v 1.6 1996/03/17 00:43:52 thorpej Exp $ */
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/* $NetBSD: ramdisk.c,v 1.7 1996/03/22 23:02:02 gwr Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross, Leo Weppelman.
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@ -46,6 +46,8 @@
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/buf.h>
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#include <sys/device.h>
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@ -74,15 +76,10 @@ extern vm_offset_t kmem_alloc __P((vm_map_t, vm_size_t));
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*
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* XXX Assumption: 16 RAM-disks are enough!
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*/
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#define RD_MAX_UNITS 0x10
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#define RD_IS_CTRL(unit) (unit & 0x10)
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#define RD_UNIT(unit) (unit & 0xF)
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/*
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* XXX - This is just for a sanity check. Only
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* applies to kernel-space RAM disk allocations.
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*/
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#define RD_KMEM_MAX_SIZE 0x100000 /* 1MB */
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/* autoconfig stuff... */
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struct rd_softc {
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@ -100,36 +97,66 @@ struct rd_softc {
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#define RD_ISOPEN 0x01
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#define RD_SERVED 0x02
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static int rd_match (struct device *, void *self, void *);
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static void rd_attach(struct device *, struct device *self, void *);
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struct cfattach rd_ca = {
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sizeof(struct rd_softc), rd_match, rd_attach
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};
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static void rd_attach __P((struct device *, struct device *, void *));
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/*
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* Some ports (like i386) use a swapgeneric that wants to
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* snoop around in this rd_cd structure. It is preserved
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* (for now) to remain compatible with such practice.
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* XXX - that practice is questionable...
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*/
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struct cfdriver rd_cd = {
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NULL, "rd", DV_DULL, NULL, 0
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};
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void rdstrategy __P((struct buf *bp));
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struct dkdriver rddkdriver = { rdstrategy };
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static int
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rd_match(parent, self, aux)
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struct device *parent;
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void *self;
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void *aux;
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static int ramdisk_ndevs;
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static void *ramdisk_devs[RD_MAX_UNITS];
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/*
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* This is called if we are configured as a pseudo-device
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*/
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void
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rdattach(n)
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int n;
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{
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#ifdef RAMDISK_HOOKS
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/*
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* This external function allows for a machine dependent
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* match function.
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*/
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return (rd_match_hook(parent, self, aux));
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#else
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return(1);
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struct rd_softc *sc;
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int i;
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#ifdef DIAGNOSTIC
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if (ramdisk_ndevs) {
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printf("ramdisk: multiple attach calls?\n");
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return;
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}
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#endif
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/* XXX: Are we supposed to provide a default? */
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if (n <= 1)
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n = 1;
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if (n > RD_MAX_UNITS)
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n = RD_MAX_UNITS;
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ramdisk_ndevs = n;
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/* XXX: Fake-up rd_cd (see above) */
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rd_cd.cd_ndevs = ramdisk_ndevs;
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rd_cd.cd_devs = ramdisk_devs;
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/* Attach as if by autoconfig. */
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for (i = 0; i < n; i++) {
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sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK);
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if (!sc) {
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printf("ramdisk: malloc for attach failed!\n");
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return;
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}
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bzero((caddr_t)sc, sizeof(*sc));
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ramdisk_devs[i] = sc;
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sc->sc_dev.dv_unit = i;
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sprintf(sc->sc_dev.dv_xname, "rd%d", i);
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rd_attach(NULL, &sc->sc_dev, NULL);
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}
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}
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static void
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@ -148,12 +175,10 @@ rd_attach(parent, self, aux)
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*/
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rd_attach_hook(sc->sc_dev.dv_unit, &sc->sc_rd);
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#endif
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printf("\n");
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/*
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* Initialize and attach the disk structure.
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*/
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bzero(&sc->sc_dkdev, sizeof(sc->sc_dkdev));
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sc->sc_dkdev.dk_driver = &rddkdriver;
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sc->sc_dkdev.dk_name = sc->sc_dev.dv_xname;
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disk_attach(&sc->sc_dkdev);
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@ -187,9 +212,9 @@ int rdsize(dev_t dev)
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/* Disallow control units. */
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unit = minor(dev);
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if (unit >= rd_cd.cd_ndevs)
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if (unit >= ramdisk_ndevs)
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return 0;
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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if (sc == NULL)
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return 0;
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@ -209,9 +234,9 @@ int rdopen(dev, flag, fmt, proc)
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md = minor(dev);
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unit = RD_UNIT(md);
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if (unit >= rd_cd.cd_ndevs)
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if (unit >= ramdisk_ndevs)
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return ENXIO;
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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if (sc == NULL)
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return ENXIO;
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@ -249,7 +274,7 @@ int rdclose(dev, flag, fmt, proc)
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md = minor(dev);
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unit = RD_UNIT(md);
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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if (RD_IS_CTRL(md))
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return 0;
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@ -291,7 +316,7 @@ rdstrategy(bp)
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md = minor(bp->b_dev);
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unit = RD_UNIT(md);
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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switch (sc->sc_type) {
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#if RAMDISK_SERVER
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@ -353,7 +378,7 @@ rdioctl(dev, cmd, data, flag, proc)
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md = minor(dev);
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unit = RD_UNIT(md);
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sc = rd_cd.cd_devs[unit];
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sc = ramdisk_devs[unit];
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/* If this is not the control device, punt! */
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if (RD_IS_CTRL(md) == 0)
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@ -399,8 +424,6 @@ rd_ioctl_kalloc(sc, urd, proc)
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/* Sanity check the size. */
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size = urd->rd_size;
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if (size > RD_KMEM_MAX_SIZE)
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return EINVAL;
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addr = kmem_alloc(kernel_map, size);
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if (!addr)
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return ENOMEM;
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@ -1,4 +1,4 @@
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/* $NetBSD: ramdisk.h,v 1.3 1996/03/07 10:26:31 leo Exp $ */
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/* $NetBSD: ramdisk.h,v 1.4 1996/03/22 23:02:04 gwr Exp $ */
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/*
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* Copyright (c) 1995 Gordon W. Ross
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@ -85,7 +85,6 @@ struct rd_conf {
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* called by the ramdisk driver to allow machine-dependent to
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* match/configure and/or load each ramdisk unit.
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*/
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extern int rd_match_hook __P((struct device *, void *, void *));
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extern void rd_attach_hook __P((int unit, struct rd_conf *));
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extern void rd_open_hook __P((int unit, struct rd_conf *));
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#endif
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