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When booting from a floppy drive and RAMDSK_HOOKS is defined, arrange for

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a callback from memory disk driver to load the actual root image.
This commit is contained in:
pk 1996-06-20 20:12:31 +00:00
parent d802ca2b2a
commit b0b2a995cd
1 changed files with 69 additions and 2 deletions
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71
sys/arch/sparc/dev/fd.c
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@ -1,4 +1,4 @@
/* $NetBSD: fd.c,v 1.35 1996/06/16 23:28:18 pk Exp $ */
/* $NetBSD: fd.c,v 1.36 1996/06/20 20:12:31 pk Exp $ */
/*-
* Copyright (c) 1993, 1994, 1995 Charles Hannum.
@ -1694,6 +1694,10 @@ fd_do_eject()
auxregbisc(AUXIO_FEJ, AUXIO_FDS);
}
#ifdef RAMDISK_HOOKS
int fd_read_rd_image __P((size_t *, caddr_t *));
#endif
/* ARGSUSED */
void
fd_mountroot_hook(dev)
@ -1707,7 +1711,70 @@ fd_mountroot_hook(dev)
c = cngetc();
if ((c == '\r') || (c == '\n')) {
printf("\n");
return;
break;
}
}
#ifdef RAMDISK_HOOKS
{
extern int (*rd_read_image) __P((size_t *, caddr_t *));
rd_read_image = fd_read_rd_image;
}
#endif
}
#ifdef RAMDISK_HOOKS
#include <sys/malloc.h>
#include <sys/proc.h>
#define FDMICROROOTSIZE ((2*18*80) << DEV_BSHIFT)
int
fd_read_rd_image(sizep, addrp)
size_t *sizep;
caddr_t *addrp;
{
struct buf buf, *bp = &buf;
dev_t dev;
off_t offset;
caddr_t addr;
dev = makedev(54,0); /* XXX */
MALLOC(addr, caddr_t, FDMICROROOTSIZE, M_DEVBUF, M_WAITOK);
*addrp = addr;
if (fdopen(dev, 0, S_IFCHR, NULL))
panic("fd: mountroot: fdopen");
offset = 0;
for (;;) {
bp->b_dev = dev;
bp->b_error = 0;
bp->b_resid = 0;
bp->b_proc = NULL;
bp->b_flags = B_BUSY | B_PHYS | B_RAW | B_READ;
bp->b_blkno = btodb(offset);
bp->b_bcount = DEV_BSIZE;
bp->b_data = addr;
fdstrategy(bp);
while ((bp->b_flags & B_DONE) == 0) {
tsleep((caddr_t)bp, PRIBIO + 1, "physio", 0);
}
if (bp->b_error)
panic("fd: mountroot: fdread error %d", bp->b_error);
if (bp->b_resid != 0)
break;
addr += DEV_BSIZE;
offset += DEV_BSIZE;
if (offset + DEV_BSIZE > FDMICROROOTSIZE)
break;
}
(void)fdclose(dev, 0, S_IFCHR, NULL);
*sizep = offset;
fd_do_eject();
return 0;
}
#endif