86ed54ee94
. unmap device drivers from dmap when PM signals they are dead . new null-io function (no_dev_io) to fill in for io functions of unmapped drivers . driver (process number) of unmapped drivers is NONE instead of 0 (a valid process number) IS: . print mutable flag of dmap table too FS changes require sync() to be done 'manually' (currently by reboot/shutdown) at shutdown time; could be caught by SIGTERM in the future.
205 lines
7.6 KiB
C
205 lines
7.6 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 <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <minix/com.h>
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#include "param.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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#define NC(x) (NR_CTRLRS >= (x))
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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[NR_DEVICES]; /* actual map */
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PRIVATE struct dmap init_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, MEM_PROC_NR, 0) /* 1 = /dev/mem */
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DT(0, no_dev, 0, 0, DMAP_MUTABLE) /* 2 = /dev/fd0 */
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DT(0, no_dev, 0, 0, DMAP_MUTABLE) /* 3 = /dev/c0 */
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DT(1, tty_opcl, gen_io, TTY_PROC_NR, 0) /* 4 = /dev/tty00 */
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DT(1, ctty_opcl,ctty_io, TTY_PROC_NR, 0) /* 5 = /dev/tty */
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DT(0, no_dev, 0, NONE, DMAP_MUTABLE) /* 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(0, no_dev, 0, NONE, DMAP_MUTABLE) /* 8 = /dev/c1 */
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DT(0, 0, 0, 0, DMAP_MUTABLE) /* 9 = not used */
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DT(0, no_dev, 0, 0, DMAP_MUTABLE) /*10 = /dev/c2 */
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DT(0, 0, 0, 0, DMAP_MUTABLE) /*11 = not used */
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DT(0, no_dev, 0, NONE, DMAP_MUTABLE) /*12 = /dev/c3 */
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DT(0, no_dev, 0, NONE, DMAP_MUTABLE) /*13 = /dev/audio */
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DT(0, no_dev, 0, NONE, DMAP_MUTABLE) /*14 = /dev/mixer */
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DT(1, gen_opcl, gen_io, LOG_PROC_NR, 0) /*15 = /dev/klog */
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DT(0, no_dev, 0, NONE, DMAP_MUTABLE) /*16 = /dev/random*/
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DT(0, no_dev, 0, NONE, DMAP_MUTABLE) /*17 = /dev/cmos */
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#endif /* IBM_PC */
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};
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/*===========================================================================*
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* do_devctl *
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*===========================================================================*/
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PUBLIC int do_devctl()
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{
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int result;
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switch(m_in.ctl_req) {
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case DEV_MAP:
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/* Try to update device mapping. */
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result = map_driver(m_in.dev_nr, m_in.driver_nr, m_in.dev_style);
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break;
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case DEV_UNMAP:
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result = map_driver(m_in.dev_nr, NONE, 0);
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break;
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default:
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result = EINVAL;
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}
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return(result);
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}
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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, 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 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. If the proc_nr is set to NONE, we're supposed
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* to unmap it.
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*
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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 < 0 || major >= NR_DEVICES) return(ENODEV);
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dp = &dmap[major];
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/* Check if we're supposed to unmap it. If so, do it even
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* if busy or unmutable, as unmap is called when driver has
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* exited.
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*/
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if(proc_nr == NONE) {
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dp->dmap_opcl = no_dev;
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dp->dmap_io = no_dev_io;
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dp->dmap_driver = NONE;
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dp->dmap_flags = DMAP_MUTABLE; /* When gone, not busy or reserved. */
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return(OK);
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}
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/* See if updating the entry is allowed. */
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if (! (dp->dmap_flags & DMAP_MUTABLE)) return(EPERM);
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if (dp->dmap_flags & DMAP_BUSY) return(EBUSY);
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/* Check process number of new driver. */
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if (! isokprocnr(proc_nr)) return(EINVAL);
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/* Try to update the entry. */
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switch (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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* dmap_unmap_by_proc *
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*===========================================================================*/
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PUBLIC void dmap_unmap_by_proc(int proc_nr)
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{
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int i, r;
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for (i=0; i<NR_DEVICES; i++)
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if(dmap[i].dmap_driver && dmap[i].dmap_driver == proc_nr)
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if((r=map_driver(i, NONE, 0)) != OK)
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printf("FS: unmap of p %d / d %d failed: %d\n", proc_nr, i, r);
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return;
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}
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/*===========================================================================*
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* build_dmap *
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*===========================================================================*/
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PUBLIC void build_dmap()
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{
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/* Initialize the table with all device <-> driver mappings. Then, map
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* the boot driver to a controller and update the dmap table to that
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* selection. The boot driver and the controller it handles are set at
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* the boot monitor.
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*/
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char driver[16];
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char *controller = "c##";
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int nr, major = -1;
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int i,s;
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struct dmap *dp;
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/* Build table with device <-> driver mappings. */
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for (i=0; i<NR_DEVICES; i++) {
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dp = &dmap[i];
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if (i < sizeof(init_dmap)/sizeof(struct dmap) &&
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init_dmap[i].dmap_opcl != no_dev) { /* a preset driver */
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dp->dmap_opcl = init_dmap[i].dmap_opcl;
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dp->dmap_io = init_dmap[i].dmap_io;
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dp->dmap_driver = init_dmap[i].dmap_driver;
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dp->dmap_flags = init_dmap[i].dmap_flags;
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} else { /* no default */
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dp->dmap_opcl = no_dev;
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dp->dmap_io = no_dev_io;
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dp->dmap_driver = NONE;
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dp->dmap_flags = DMAP_MUTABLE;
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}
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}
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/* Get settings of 'controller' and 'driver' at the boot monitor. */
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if ((s = env_get_param("label", driver, sizeof(driver))) != OK)
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panic(__FILE__,"couldn't get boot monitor parameter 'driver'", s);
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if ((s = env_get_param("controller", controller, sizeof(controller))) != OK)
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panic(__FILE__,"couldn't get boot monitor parameter 'controller'", s);
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/* Determine major number to map driver onto. */
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if (controller[0] == 'f' && controller[1] == 'd') {
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major = FLOPPY_MAJOR;
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}
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else if (controller[0] == 'c' && isdigit(controller[1])) {
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if ((nr = (unsigned) atoi(&controller[1])) > NR_CTRLRS)
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panic(__FILE__,"monitor 'controller' maximum 'c#' is", NR_CTRLRS);
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major = CTRLR(nr);
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}
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else {
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panic(__FILE__,"monitor 'controller' syntax is 'c#' of 'fd'", NO_NUM);
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}
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/* Now try to set the actual mapping and report to the user. */
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if ((s=map_driver(major, DRVR_PROC_NR, STYLE_DEV)) != OK)
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panic(__FILE__,"map_driver failed",s);
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printf("Boot medium driver: %s driver mapped onto controller %s.\n",
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driver, controller);
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}
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