5cb608d7e1
Delete device names from all the drivers. Move device inslude files from include/sys to include/machine directory. Only include files which have something useful for user layer (like special ioctls codes) should be placed into sys.
78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/*
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* Copyright (c) 1986 Regents of the University of California.
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* All rights reserved. The Berkeley software License Agreement
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* specifies the terms and conditions for redistribution.
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*/
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#include <sys/param.h>
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#include <sys/user.h>
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#include <sys/conf.h>
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#include <sys/systm.h>
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#include <sys/uio.h>
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void kmemdev()
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{
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u.u_rval = makedev(MEM_MAJOR, 1);
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}
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/*
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* Read/write routine for /dev/mem family.
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*/
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int
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mmrw (dev, uio, flag)
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dev_t dev;
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register struct uio *uio;
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int flag;
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{
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register struct iovec *iov;
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int error = 0;
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register u_int c;
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caddr_t addr;
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//printf ("mmrw (dev=%u, len=%u, flag=%d)\n", dev, uio->uio_iov->iov_len, flag);
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while (uio->uio_resid && error == 0) {
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iov = uio->uio_iov;
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if (iov->iov_len == 0) {
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uio->uio_iov++;
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uio->uio_iovcnt--;
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if (uio->uio_iovcnt < 0)
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panic("mmrw");
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continue;
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}
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switch (minor(dev)) {
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case 0: /* minor device 0 is physical memory (/dev/mem) */
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case 1: /* minor device 1 is kernel memory (/dev/kmem) */
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addr = (caddr_t) uio->uio_offset;
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if ((badkaddr (addr) && baduaddr (addr)) ||
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(badkaddr (addr + iov->iov_len - 1) &&
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baduaddr (addr + iov->iov_len - 1))) {
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error = EFAULT;
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break;
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}
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error = uiomove(addr, iov->iov_len, uio);
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break;
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case 2: /* minor device 2 is EOF/RATHOLE (/dev/null) */
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if (uio->uio_rw == UIO_READ)
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return(0);
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c = iov->iov_len;
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iov->iov_base += c;
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iov->iov_len -= c;
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uio->uio_offset += c;
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uio->uio_resid -= c;
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break;
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case 3: /* minor device 3 is ZERO (/dev/zero) */
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if (uio->uio_rw == UIO_WRITE)
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return(EIO);
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c = iov->iov_len;
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bzero (iov->iov_base, c);
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iov->iov_base += c;
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iov->iov_len -= c;
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uio->uio_offset += c;
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uio->uio_resid -= c;
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break;
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default:
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return(EINVAL);
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}
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}
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return(error);
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}
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