hd.c

早期freebsd实现

/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Harris Corp.
 *
 * 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.
 *
 *	@(#)hd.c	7.12 (Berkeley) 12/16/90
 */

#include "hd.h"

#if NHD > 0
#include "sys/param.h"
#include "sys/buf.h"
#include "sys/conf.h"
#include "sys/dkstat.h"
#include "sys/disklabel.h"
#include "sys/file.h"
#include "sys/systm.h"
#include "sys/vmmac.h"
#include "sys/time.h"
#include "sys/proc.h"
#include "sys/uio.h"
#include "sys/syslog.h"
#include "sys/kernel.h"
#include "sys/ioctl.h"
#include "sys/stat.h"
#include "sys/errno.h"

#include "../include/cpu.h"
#include "../include/mtpr.h"

#include "../vba/vbavar.h"
#include "../vba/hdreg.h"

#define	b_cylin	b_resid

#define	hdunit(dev)		(minor(dev)>>3)
#define	hdpart(dev)		(minor(dev)&0x07)
#define	hdminor(unit, part)	(((unit)<<3)|(part))

struct vba_ctlr *hdcminfo[NHDC];
struct vba_device *hddinfo[NHD];
int hdcprobe(), hdslave(), hdattach(), hddgo(), hdstrategy();
long hdstd[] = { 0 };
struct vba_driver hdcdriver =
    { hdcprobe, hdslave, hdattach, hddgo, hdstd, "hd", hddinfo, "hdc", hdcminfo };

/*
 * Per-controller state.
 */
struct hdcsoftc {
	u_short	hdc_flags;
#define	HDC_INIT	0x01	/* controller initialized */
#define	HDC_STARTED	0x02	/* start command issued */
#define	HDC_LOCKED	0x04	/* locked for direct controller access */
#define	HDC_WAIT	0x08	/* someone needs direct controller access */
	u_short	hdc_wticks;		/* timeout */
	struct master_mcb *hdc_mcbp;	/* address of controller mcb */
	struct registers *hdc_reg;	/* base address of i/o regs */
	struct vb_buf hdc_rbuf;		/* vba resources */
	struct master_mcb hdc_mcb;	/* controller mcb */
} hdcsoftc[NHDC];

#define	HDCMAXTIME	20		/* max time for operation, sec. */
#define	HDCINTERRUPT	0xf0		/* interrupt vector */

/*
 * Per-drive state; probably everything should be "hd_", not "dk_",
 * but it's not worth it, and dk is a better mnemonic for disk anyway.
 */
struct dksoftc {
#ifdef COMPAT_42
	u_short	dk_def_cyl;	/* definition track cylinder address */
#endif
	int	dk_state;	/* open fsm */
	u_short	dk_bshift;	/* shift for * (DEV_BSIZE / sectorsize) XXX */
	int	dk_wlabel;	/* if label sector is writeable */
	u_long	dk_copenpart;	/* character units open on this drive */
	u_long	dk_bopenpart;	/* block units open on this drive */
	u_long	dk_openpart;	/* all units open on this drive */
	int	dk_unit;	/* unit# */
	int	dk_ctlr;	/* controller# */
	int	dk_format;	/* if format program is using disk */
	struct buf dk_utab;		/* i/o queue header */
	struct disklabel dk_label;	/* disklabel for this disk */
	struct mcb dk_mcb;		/* disk mcb */
} dksoftc[NHD];

/*
 * Drive states.  Used during steps of open/initialization.
 * States < OPEN (> 0) are transient, during an open operation.
 * OPENRAW is used for unlabeled disks, to allow format operations.
 */
#define	CLOSED		0		/* disk is closed */
#define	WANTOPEN	1		/* open requested, not started */
#define	WANTOPENRAW	2		/* open requested, no label */
#define	RDLABEL		3		/* reading pack label */
#define	OPEN		4		/* intialized and ready */
#define	OPENRAW		5		/* open, no label */

int hdcwstart, hdcwatch();

/* see if the controller is really there, if so, init it. */
/* ARGSUSED */
hdcprobe(reg, vm)
	caddr_t reg;
	/* register */ struct vba_ctlr *vm;
{
	register int br, cvec;		/* must be r12, r11 */
	register struct hdcsoftc *hdc;
	static struct module_id id;
	struct pte *dummypte;
	caddr_t putl;

	/* initialize the hdc controller structure. */
	hdc = &hdcsoftc[vm->um_ctlr];
	if (!vbmemalloc(1, reg, &dummypte, &putl)) {
		printf("hdc%d: vbmemalloc failed.\n", vm->um_ctlr);
		return(0);
	}
	hdc->hdc_reg = (struct registers *)putl;

	/*
	 * try and ping the MID register; side effect of wbadaddr is to read
	 * the module id; the controller is bad if it's not an hdc, the hdc's
	 * writeable control store is not loaded, or the hdc failed the
	 * functional integrity test;
	 */
	if (wbadaddr(&hdc->hdc_reg->module_id, 4,
	    vtoph((struct process *)NULL, &id)))
		return(0);
	DELAY(10000);
	mtpr(PADC, 0);
	if (id.module_id != (u_char)HDC_MID) {
		printf("hdc%d: bad module id; id = %x.\n",
		    vm->um_ctlr, id.module_id);
		return(0);
	}
	if (id.code_rev == (u_char)0xff) {
		printf("hdc%d: micro-code not loaded.\n", vm->um_ctlr);
		return(0);
	}
	if (id.fit != (u_char)0xff) {
		printf("hdc%d: FIT test failed.\n", vm->um_ctlr);
		return(0);
	}

	/* reset that pup; flag as inited */
	hdc->hdc_reg->soft_reset = 0;
	DELAY(1000000);
	hdc->hdc_flags |= HDC_INIT;

	/* allocate page tables and i/o buffer. */
	if (!vbainit(&hdc->hdc_rbuf, MAXPHYS, VB_32BIT|VB_SCATTER)) {
		printf("hdc%d: vbainit failed\n", vm->um_ctlr);
		return (0);
	}

	/* set pointer to master control block */
	hdc->hdc_mcbp =
	    (struct master_mcb *)vtoph((struct proc *)NULL, &hdc->hdc_mcb);

	br = 0x17, cvec = HDCINTERRUPT + vm->um_ctlr;		/* XXX */
	return(sizeof(struct registers));
}

/* ARGSUSED */
hdslave(vi, vdaddr)
	struct vba_device *vi;
	struct vddevice *vdaddr;
{
	register struct mcb *mcb;
	register struct disklabel *lp;
	register struct dksoftc *dk;
	static struct status status;

	dk = &dksoftc[vi->ui_unit];
	dk->dk_unit = vi->ui_unit;
	dk->dk_ctlr = vi->ui_ctlr;

	mcb = &dk->dk_mcb;
	mcb->command = HCMD_STATUS;
	mcb->chain[0].wcount = sizeof(struct status) / sizeof(long);
	mcb->chain[0].memadr  = (u_long)vtoph((struct process *)0, &status);
	if (hdimcb(dk)) {
		printf(" (no status)\n");
		return(0);
	}

	/*
	 * Report the drive down if anything in the drive status looks bad.
	 * If the drive is offline and it is not on cylinder, then the drive
	 * is not there.  If there is a fault condition, the hdc will try to
	 * clear it when we read the disklabel information.
	 */
	if (!(status.drs&DRS_ONLINE)) {
		if (status.drs&DRS_ON_CYLINDER)
			printf(" (not online)\n");
		return(0);
	}
	if (status.drs&DRS_FAULT)
		printf(" (clearing fault)");

	lp = &dk->dk_label;
#ifdef RAW_SIZE
	lp->d_secsize = status.bytes_per_sec;
#else
	lp->d_secsize = 512;
#endif
	lp->d_nsectors = status.max_sector + 1;
	lp->d_ntracks = status.max_head + 1;
	lp->d_ncylinders = status.max_cyl + 1;
	lp->d_secpercyl = lp->d_ntracks * lp->d_nsectors;
	lp->d_npartitions = 1;
	lp->d_partitions[0].p_offset = 0;
	lp->d_partitions[0].p_size = LABELSECTOR + 1;
	lp->d_rpm = status.rpm;
	lp->d_typename[0] = 'h';
	lp->d_typename[1] = 'd';
	lp->d_typename[2] = '\0';
#ifdef COMPAT_42
	dk->dk_def_cyl = status.def_cyl;
#endif
	return(1);
}

hdattach(vi)
	register struct vba_device *vi;
{
	register struct dksoftc *dk;
	register struct disklabel *lp;
	register int unit;

	unit = vi->ui_unit;
	if (hdinit(hdminor(unit, 0), 0)) {
		printf(": unknown drive type");
		return;
	}
	dk = &dksoftc[unit];
	lp = &dk->dk_label;
	hd_setsecsize(dk, lp);
	if (dk->dk_state == OPEN)
		printf(": %s <secsize %d, ntrak %d, ncyl %d, nsec %d>",
		    lp->d_typename, lp->d_secsize, lp->d_ntracks,
		    lp->d_ncylinders, lp->d_nsectors);

	/*
	 * (60 / rpm) / (sectors per track * (bytes per sector / 2))
	 */
	if (vi->ui_dk >= 0)
		dk_wpms[vi->ui_dk] =
		    (lp->d_rpm * lp->d_nsectors * lp->d_secsize) / 120;
#ifdef notyet
	addswap(makedev(HDMAJOR, hdminor(unit, 0)), lp);
#endif
}

hdopen(dev, flags, fmt)
	dev_t dev;
	int flags, fmt;
{
	register struct disklabel *lp;
	register struct dksoftc *dk;
	register struct partition *pp;
	register int unit;
	struct vba_device *vi;
	int s, error, part = hdpart(dev), mask = 1 << part;
	daddr_t start, end;

	unit = hdunit(dev);
	if (unit >= NHD || (vi = hddinfo[unit]) == 0 || vi->ui_alive == 0)
		return(ENXIO);
	dk = &dksoftc[unit];
	lp = &dk->dk_label;
	s = spl7();
	while (dk->dk_state != OPEN && dk->dk_state != OPENRAW &&
	    dk->dk_state != CLOSED)
		if (error = tsleep((caddr_t)dk, (PZERO+1) | PCATCH,
		    devopn, 0)) {
			splx(s);
			return (error);
		}
	splx(s);
	if (dk->dk_state != OPEN && dk->dk_state != OPENRAW)
		if (error = hdinit(dev, flags))
			return(error);

	if (hdcwstart == 0) {
		timeout(hdcwatch, (caddr_t)0, hz);
		hdcwstart++;
	}
	/*
	 * Warn if a partion is opened that overlaps another partition
	 * which is open unless one is the "raw" partition (whole disk).
	 */
#define	RAWPART		8		/* 'x' partition */	/* XXX */
	if ((dk->dk_openpart & mask) == 0 && part != RAWPART) {
		pp = &lp->d_partitions[part];
		start = pp->p_offset;
		end = pp->p_offset + pp->p_size;
		for (pp = lp->d_partitions;
		     pp < &lp->d_partitions[lp->d_npartitions]; pp++) {
			if (pp->p_offset + pp->p_size <= start ||
			    pp->p_offset >= end)
				continue;
			if (pp - lp->d_partitions == RAWPART)
				continue;
			if (dk->dk_openpart & (1 << (pp - lp->d_partitions)))
				log(LOG_WARNING,
				    "hd%d%c: overlaps open partition (%c)\n",
				    unit, part + 'a',
				    pp - lp->d_partitions + 'a');
		}
	}
	if (part >= lp->d_npartitions)
		return(ENXIO);
	dk->dk_openpart |= mask;
	switch (fmt) {
	case S_IFCHR:
		dk->dk_copenpart |= mask;
		break;
	case S_IFBLK:
		dk->dk_bopenpart |= mask;
		break;
	}
	return(0);
}

/* ARGSUSED */
hdclose(dev, flags, fmt)
	dev_t dev;
	int flags, fmt;
{
	register struct dksoftc *dk;
	int mask;

	dk = &dksoftc[hdunit(dev)];
	mask = 1 << hdpart(dev);
	switch (fmt) {
	case S_IFCHR:
		dk->dk_copenpart &= ~mask;
		break;
	case S_IFBLK:
		dk->dk_bopenpart &= ~mask;
		break;
	}
	if (((dk->dk_copenpart | dk->dk_bopenpart) & mask) == 0)
		dk->dk_openpart &= ~mask;
	/*
	 * Should wait for i/o to complete on this partition
	 * even if others are open, but wait for work on blkflush().
	 */
	if (dk->dk_openpart == 0) {
		int s = spl7();
		while (dk->dk_utab.b_actf)
			sleep((caddr_t)dk, PZERO-1);
		splx(s);
		dk->dk_state = CLOSED;
		dk->dk_wlabel = 0;
	}
	return(0);
}

hdinit(dev, flags)
	dev_t dev;
	int flags;
{
	register struct dksoftc *dk;
	register struct disklabel *lp;
	struct vba_device *vi;
	int error, unit;
	char *msg, *readdisklabel();
	extern int cold;

	vi = hddinfo[unit = hdunit(dev)];
	dk = &dksoftc[unit];
	dk->dk_unit = vi->ui_slave;
	dk->dk_ctlr = vi->ui_ctlr;

	if (flags & O_NDELAY) {
		dk->dk_state = OPENRAW;
		return(0);
	}

	error = 0;
	lp = &dk->dk_label;
	dk->dk_state = RDLABEL;
	if (msg = readdisklabel(dev, hdstrategy, lp)) {
		if (cold) {
			printf(": %s\n", msg);
			dk->dk_state = CLOSED;
		} else {
			log(LOG_ERR, "hd%d: %s\n", unit, msg);
			dk->dk_state = OPENRAW;
		}
#ifdef COMPAT_42
		hdclock(vi->ui_ctlr);
		if (!(error = hdreadgeometry(dk)))
			dk->dk_state = OPEN;
		hdcunlock(vi->ui_ctlr);
#endif
	} else
		dk->dk_state = OPEN;
	wakeup((caddr_t)dk);
	return(error);
}

hd_setsecsize(dk, lp)
	register struct dksoftc *dk;
	struct disklabel *lp;
{
	register int mul;

	/*
	 * Calculate scaling shift for mapping
	 * DEV_BSIZE blocks to drive sectors.
	 */
	mul = DEV_BSIZE / lp->d_secsize;
	dk->dk_bshift = 0;
	while ((mul >>= 1) > 0)
		dk->dk_bshift++;
}

/* ARGSUSED */
hddgo(vm)
	struct vba_device *vm;
{}

extern int name_ext;
hdstrategy(bp)
	register struct buf *bp;
{
	register struct vba_device *vi;
	register struct disklabel *lp;
	register struct dksoftc *dk;
	struct buf *dp;