--- /dev/null
+/*
+ * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
+ */
+/*
+ * Copyright (c) 1997 by Apple Computer, Inc., all rights reserved
+ * Copyright (c) 1993 NeXT Computer, Inc.
+ *
+ * UNIX Device switch tables.
+ *
+ * HISTORY
+ *
+ * 30 July 1997 Umesh Vaishampayan (umeshv@apple.com)
+ * enabled file descriptor pseudo-device.
+ * 18 June 1993 ? at NeXT
+ * Cleaned up a lot of stuff in this file.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/ioctl.h>
+#include <sys/tty.h>
+#include <sys/conf.h>
+
+/* Prototypes that should be elsewhere: */
+extern dev_t chrtoblk(dev_t dev);
+extern int chrtoblk_set(int cdev, int bdev);
+
+struct bdevsw bdevsw[] =
+{
+ /*
+ * For block devices, every other block of 8 slots is
+ * reserved to NeXT. The other slots are available for
+ * the user. This way we can both add new entries without
+ * running into each other. Be sure to fill in NeXT's
+ * 8 reserved slots when you jump over us -- we'll do the
+ * same for you.
+ */
+
+ /* 0 - 7 are reserved to NeXT */
+
+ NO_BDEVICE, /* 0 */
+ NO_BDEVICE, /* 1 */
+ NO_BDEVICE, /* 2 */
+ NO_BDEVICE, /* 3 */
+ NO_BDEVICE, /* 4 */
+ NO_BDEVICE, /* 5 */
+ NO_BDEVICE, /* 6 */
+ NO_BDEVICE, /* 7 */
+
+ /* 8 - 15 are reserved to the user */
+ NO_BDEVICE, /* 8 */
+ NO_BDEVICE, /* 9 */
+ NO_BDEVICE, /* 10 */
+ NO_BDEVICE, /* 11 */
+ NO_BDEVICE, /* 12 */
+ NO_BDEVICE, /* 13 */
+ NO_BDEVICE, /* 14 */
+ NO_BDEVICE, /* 15 */
+
+ /* 16 - 23 are reserved to NeXT */
+ NO_BDEVICE, /* 16 */
+ NO_BDEVICE, /* 17 */
+ NO_BDEVICE, /* 18 */
+ NO_BDEVICE, /* 18 */
+ NO_BDEVICE, /* 20 */
+ NO_BDEVICE, /* 21 */
+ NO_BDEVICE, /* 22 */
+ NO_BDEVICE, /* 23 */
+};
+
+const int nblkdev = sizeof(bdevsw) / sizeof(bdevsw[0]);
+
+extern struct tty *km_tty[];
+extern d_open_t cnopen;
+extern d_close_t cnclose;
+extern d_read_t cnread;
+extern d_write_t cnwrite;
+extern d_ioctl_t cnioctl;
+extern d_select_t cnselect;
+extern d_open_t kmopen;
+extern d_close_t kmclose;
+extern d_read_t kmread;
+extern d_write_t kmwrite;
+extern d_ioctl_t kmioctl;
+extern d_open_t sgopen;
+extern d_close_t sgclose;
+extern d_ioctl_t sgioctl;
+
+#if NVOL > 0
+extern d_open_t volopen;
+extern d_close_t volclose;
+extern d_ioctl_t volioctl;
+#else
+#define volopen eno_opcl
+#define volclose eno_opcl
+#define volioctl eno_ioctl
+#endif
+
+extern d_open_t cttyopen;
+extern d_read_t cttyread;
+extern d_write_t cttywrite;
+extern d_ioctl_t cttyioctl;
+extern d_select_t cttyselect;
+
+extern d_read_t mmread;
+extern d_write_t mmwrite;
+extern d_ioctl_t mmioctl;
+#define mmselect (select_fcn_t *)seltrue
+#define mmmmap eno_mmap
+
+#include <pty.h>
+#if NPTY > 0
+extern d_open_t ptsopen;
+extern d_close_t ptsclose;
+extern d_read_t ptsread;
+extern d_write_t ptswrite;
+extern d_stop_t ptsstop;
+extern d_select_t ptsselect;
+extern d_open_t ptcopen;
+extern d_close_t ptcclose;
+extern d_read_t ptcread;
+extern d_write_t ptcwrite;
+extern d_select_t ptcselect;
+extern d_ioctl_t ptyioctl;
+#else
+#define ptsopen eno_opcl
+#define ptsclose eno_opcl
+#define ptsread eno_rdwrt
+#define ptswrite eno_rdwrt
+#define ptsstop nulldev
+
+#define ptcopen eno_opcl
+#define ptcclose eno_opcl
+#define ptcread eno_rdwrt
+#define ptcwrite eno_rdwrt
+#define ptcselect eno_select
+#define ptyioctl eno_ioctl
+#endif
+
+extern d_open_t logopen;
+extern d_close_t logclose;
+extern d_read_t logread;
+extern d_ioctl_t logioctl;
+extern d_select_t logselect;
+
+extern d_open_t oslog_streamopen;
+extern d_close_t oslog_streamclose;
+extern d_read_t oslog_streamread;
+extern d_ioctl_t oslog_streamioctl;
+extern d_select_t oslog_streamselect;
+
+extern d_open_t oslogopen;
+extern d_close_t oslogclose;
+extern d_select_t oslogselect;
+extern d_ioctl_t oslogioctl;
+
+#define nullopen (d_open_t *)&nulldev
+#define nullclose (d_close_t *)&nulldev
+#define nullread (d_read_t *)&nulldev
+#define nullwrite (d_write_t *)&nulldev
+#define nullioctl (d_ioctl_t *)&nulldev
+#define nullselect (d_select_t *)&nulldev
+#define nullstop (d_stop_t *)&nulldev
+#define nullreset (d_reset_t *)&nulldev
+
+struct cdevsw cdevsw[] = {
+ /*
+ * To add character devices to this table dynamically, use cdevsw_add.
+ */
+
+ [0] = {
+ cnopen, cnclose, cnread, cnwrite,
+ cnioctl, nullstop, nullreset, 0, cnselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
+ },
+ [1] = NO_CDEVICE,
+ [2] = {
+ cttyopen, nullclose, cttyread, cttywrite,
+ cttyioctl, nullstop, nullreset, 0, cttyselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
+ },
+ [3] = {
+ nullopen, nullclose, mmread, mmwrite,
+ mmioctl, nullstop, nullreset, 0, mmselect,
+ mmmmap, eno_strat, eno_getc, eno_putc, D_DISK
+ },
+ [PTC_MAJOR] = {
+ ptsopen, ptsclose, ptsread, ptswrite,
+ ptyioctl, ptsstop, nullreset, 0, ptsselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
+ },
+ [PTS_MAJOR] = {
+ ptcopen, ptcclose, ptcread, ptcwrite,
+ ptyioctl, nullstop, nullreset, 0, ptcselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, D_TTY
+ },
+ [6] = {
+ logopen, logclose, logread, eno_rdwrt,
+ logioctl, eno_stop, nullreset, 0, logselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, 0
+ },
+ [7] = {
+ oslogopen, oslogclose, eno_rdwrt, eno_rdwrt,
+ oslogioctl, eno_stop, nullreset, 0, oslogselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, 0
+ },
+ [8] = {
+ oslog_streamopen, oslog_streamclose, oslog_streamread, eno_rdwrt,
+ oslog_streamioctl, eno_stop, nullreset, 0, oslog_streamselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, 0
+ },
+ [9 ... 11] = NO_CDEVICE,
+ [12] = {
+ kmopen, kmclose, kmread, kmwrite,
+ kmioctl, nullstop, nullreset, km_tty, ttselect,
+ eno_mmap, eno_strat, eno_getc, eno_putc, 0
+ },
+ [13 ... 41] = NO_CDEVICE,
+ [42] = {
+ volopen, volclose, eno_rdwrt, eno_rdwrt,
+ volioctl, eno_stop, eno_reset, 0, (select_fcn_t *) seltrue,
+ eno_mmap, eno_strat, eno_getc, eno_putc, 0
+ }
+};
+const int nchrdev = sizeof(cdevsw) / sizeof(cdevsw[0]);
+
+uint64_t cdevsw_flags[sizeof(cdevsw) / sizeof(cdevsw[0])];
+
+#include <sys/vnode.h> /* for VCHR and VBLK */
+/*
+ * return true if a disk
+ */
+int
+isdisk(dev_t dev, int type)
+{
+ dev_t maj = major(dev);
+
+ switch (type) {
+ case VCHR:
+ maj = chrtoblk(maj);
+ if (maj == NODEV) {
+ break;
+ }
+ /* FALL THROUGH */
+ case VBLK:
+ if (bdevsw[maj].d_type == D_DISK) {
+ return (1);
+ }
+ break;
+ }
+ return (0);
+}
+
+static int chrtoblktab[] = {
+ /* CHR *//* BLK *//* CHR *//* BLK */
+ /* 0 */ NODEV, /* 1 */ NODEV,
+ /* 2 */ NODEV, /* 3 */ NODEV,
+ /* 4 */ NODEV, /* 5 */ NODEV,
+ /* 6 */ NODEV, /* 7 */ NODEV,
+ /* 8 */ NODEV, /* 9 */ NODEV,
+ /* 10 */ NODEV, /* 11 */ NODEV,
+ /* 12 */ NODEV, /* 13 */ NODEV,
+ /* 14 */ NODEV, /* 15 */ NODEV,
+ /* 16 */ NODEV, /* 17 */ NODEV,
+ /* 18 */ NODEV, /* 19 */ NODEV,
+ /* 20 */ NODEV, /* 21 */ NODEV,
+ /* 22 */ NODEV, /* 23 */ NODEV,
+ /* 24 */ NODEV, /* 25 */ NODEV,
+ /* 26 */ NODEV, /* 27 */ NODEV,
+ /* 28 */ NODEV, /* 29 */ NODEV,
+ /* 30 */ NODEV, /* 31 */ NODEV,
+ /* 32 */ NODEV, /* 33 */ NODEV,
+ /* 34 */ NODEV, /* 35 */ NODEV,
+ /* 36 */ NODEV, /* 37 */ NODEV,
+ /* 38 */ NODEV, /* 39 */ NODEV,
+ /* 40 */ NODEV, /* 41 */ NODEV,
+ /* 42 */ NODEV, /* 43 */ NODEV,
+ /* 44 */ NODEV,
+};
+
+/*
+ * convert chr dev to blk dev
+ */
+dev_t
+chrtoblk(dev_t dev)
+{
+ int blkmaj;
+
+ if (major(dev) >= nchrdev)
+ return (NODEV);
+ blkmaj = chrtoblktab[major(dev)];
+ if (blkmaj == NODEV)
+ return (NODEV);
+ return (makedev(blkmaj, minor(dev)));
+}
+
+int
+chrtoblk_set(int cdev, int bdev)
+{
+ if (cdev >= nchrdev)
+ return (-1);
+ if (bdev != NODEV && bdev >= nblkdev)
+ return (-1);
+ chrtoblktab[cdev] = bdev;
+ return 0;
+}
projects / apple / xnu.git / blobdiff