163 lines
6.1 KiB
C
163 lines
6.1 KiB
C
/* This file contains the table with device <-> driver mappings. It also
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* contains some routines to dynamically add and/ or remove device drivers
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* or change mappings.
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*/
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#include "fs.h"
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#include "fproc.h"
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#include "dmap.h"
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#include <string.h>
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#include <minix/com.h>
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#include <minix/utils.h>
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/* Some devices may or may not be there in the next table. */
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#define DT(enable, opcl, io, driver, flags) \
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{ (enable?(opcl):no_dev), (enable?(io):0), \
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(enable?(driver):0), (flags) },
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/* The order of the entries here determines the mapping between major device
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* numbers and tasks. The first entry (major device 0) is not used. The
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* next entry is major device 1, etc. Character and block devices can be
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* intermixed at random. The ordering determines the device numbers in /dev/.
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* Note that FS knows the device number of /dev/ram/ to load the RAM disk.
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* Also note that the major device numbers used in /dev/ are NOT the same as
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* the process numbers of the device drivers.
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*/
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/*
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Driver enabled Open/Cls I/O Driver # Flags Device File
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-------------- -------- ------ ----------- ----- ------ ----
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*/
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struct dmap dmap[] = {
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DT(1, no_dev, 0, 0, 0) /* 0 = not used */
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DT(1, gen_opcl, gen_io, MEMORY, 0) /* 1 = /dev/mem */
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DT(ENABLE_FLOPPY, gen_opcl, gen_io, FLOPPY, 0) /* 2 = /dev/fd0 */
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DT(NR_CTRLRS >= 1, gen_opcl, gen_io, CTRLR(0), DMAP_MUTABLE) /* 3 = /dev/c0 */
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#if ENABLE_USER_TTY
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DT(1, tty_opcl, gen_io, TERMINAL, 0) /* 4 = /dev/tty00 */
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DT(1, ctty_opcl,ctty_io,TERMINAL, 0) /* 5 = /dev/tty */
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#else
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DT(1, tty_opcl, gen_io, TTY, 0) /* 4 = /dev/tty00 */
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DT(1, ctty_opcl,ctty_io,TTY, 0) /* 5 = /dev/tty */
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#endif
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DT(ENABLE_PRINTER, gen_opcl, gen_io, PRINTER, 0) /* 6 = /dev/lp */
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#if (MACHINE == IBM_PC)
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DT(1, no_dev, 0, 0, DMAP_MUTABLE) /* 7 = /dev/ip */
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DT(NR_CTRLRS >= 2, gen_opcl, gen_io, CTRLR(1), DMAP_MUTABLE) /* 8 = /dev/c1 */
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DT(0, 0, 0, 0, DMAP_MUTABLE) /* 9 = not used */
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DT(NR_CTRLRS >= 3, gen_opcl, gen_io, CTRLR(2), DMAP_MUTABLE) /*10 = /dev/c2 */
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DT(0, 0, 0, 0, DMAP_MUTABLE) /*11 = not used */
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DT(NR_CTRLRS >= 4, gen_opcl, gen_io, CTRLR(3), DMAP_MUTABLE) /*12 = /dev/c3 */
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DT(ENABLE_SB16, gen_opcl, gen_io, NONE, 0) /*13 = /dev/audio */
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DT(ENABLE_SB16, gen_opcl, gen_io, NONE, 0) /*14 = /dev/mixer */
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#endif /* IBM_PC */
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};
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/* This is the maximum major number at compile time. This may change when
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* devices are dynamically added or removed.
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*/
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int max_major = sizeof(dmap)/sizeof(struct dmap);
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/*===========================================================================*
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* map_driver *
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*===========================================================================*/
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PUBLIC int map_driver(major, proc_nr, dev_style)
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int major; /* major number of the device */
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int proc_nr; /* process number of the driver */
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int dev_style; /* style of the device */
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{
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/* Set a new device driver mapping in the dmap table. Given that correct
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* arguments are given, this only works if the entry is mutable and the
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* current driver is not busy.
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* Normal error codes are returned so that this function can be used from
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* a system call that tries to dynamically install a new driver.
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*/
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struct dmap *dp;
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/* Get pointer to device entry in the dmap table. */
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if (major >= max_major) /* verify bounds */
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return(ENODEV);
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dp = &dmap[major];
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/* See if updating the entry is allowed. */
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if (! (dp->dmap_flags & DMAP_MUTABLE))
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return(EPERM);
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if (dp->dmap_flags & DMAP_BUSY)
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return(EBUSY);
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/* Check process number of new driver. */
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if (! isokprocnr(proc_nr))
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return(EINVAL);
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/* Try to update the entry. */
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switch (dev_style) {
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case STYLE_DEV: dp->dmap_opcl = gen_opcl; break;
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case STYLE_TTY: dp->dmap_opcl = tty_opcl; break;
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case STYLE_CLONE: dp->dmap_opcl = clone_opcl; break;
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default: return(EINVAL);
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}
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dp->dmap_io = gen_io;
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dp->dmap_driver = proc_nr;
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return(OK);
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}
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/*===========================================================================*
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* map_controllers *
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*===========================================================================*/
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PUBLIC void map_controllers()
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{
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/* Map drivers to controllers and update the dmap table to that selection.
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* For each controller, the environment variable set by the boot monitor is
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* analyzed to see what type of Winchester disk is attached. Then, the name
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* of the driver that handles the device is looked up in the local drivertab.
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* Finally, the process number of the driver is looked up, and, if found, is
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* installed in the dmap table.
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*/
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static char ctrlr_nr[] = "c0"; /* controller currently analyzed */
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char ctrlr_type[8]; /* type of Winchester disk */
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int i, c, s;
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int proc_nr=0; /* process number of driver */
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struct drivertab *dp;
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struct drivertab {
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char wini_type[8];
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char proc_name[8];
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} drivertab[] = {
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{ "at", "AT_WINI" }, /* AT Winchester */
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{ "bios", "..." },
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{ "esdi", "..." },
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{ "xt", "..." },
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{ "aha1540", "..." },
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{ "dosfile", "..." },
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{ "fatfile", "..." },
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};
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for (c=0; c < NR_CTRLRS; c++) {
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ctrlr_nr[1] = '0' + c;
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if ((s = get_mon_param(ctrlr_nr, ctrlr_type, 8)) != OK) {
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if (s != ESRCH)
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printf("FS: warning, couldn't get monitor param: %d\n", s);
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continue;
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}
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for (dp = drivertab;
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dp < drivertab + sizeof(drivertab)/sizeof(drivertab[0]); dp++) {
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if (strcmp(ctrlr_type, dp->wini_type) == 0) { /* found driver name */
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if ((s=sys_getprocnr(&proc_nr, /* lookup proc nr */
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dp->proc_name, strlen(dp->proc_name)+1)) == OK) {
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for (i=0; i< max_major; i++) { /* find mapping */
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if (dmap[i].dmap_driver == CTRLR(c)) {
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if (map_driver(i, proc_nr, STYLE_DEV) == OK) {
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printf("FS: controller %s (%s) mapped to %s driver (proc. nr %d)\n",
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ctrlr_nr, dp->wini_type, dp->proc_name, dmap[i].dmap_driver);
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}
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}
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}
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}
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}
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}
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}
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}
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