b5e3e6d18c
. When drivers disappear that have pending select()s, wake up those user processes with EAGAIN so that they can retry their select() and won't hang forever on it. . When drivers re-appear and are mapped into the dmap, run through the list of mounted filesystems and re-dev_open() every one (for partition tables and such). This can't happen before the driver has exec()ced itself, so processes that have fork()ed but not exec()ced yet are marked as DMAP_BABY in the dmap table if they are dmapped before they are execced. If that happens, the above procedure happens after the exec(). If the exec() happens before the dmapping, it (the dev_open()ing) happens right away.
242 lines
8.6 KiB
C
242 lines
8.6 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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/* If a driver has completed its exec(), it can be announced to be up. */
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if(fproc[proc_nr].fp_execced) {
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dev_up(major);
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} else {
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dp->dmap_flags |= DMAP_BABY;
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}
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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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/*===========================================================================*
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* dmap_driver_match *
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*===========================================================================*/
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PUBLIC int dmap_driver_match(int proc, int major)
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{
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if (major < 0 || major >= NR_DEVICES) return(0);
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if(dmap[major].dmap_driver != NONE && dmap[major].dmap_driver == proc)
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return 1;
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return 0;
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}
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/*===========================================================================*
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* dmap_proc_up *
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*===========================================================================*/
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PUBLIC void dmap_proc_up(int proc)
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{
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int i;
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for (i=0; i<NR_DEVICES; i++) {
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if(dmap[i].dmap_driver != NONE
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&& dmap[i].dmap_driver == proc
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&& (dmap[i].dmap_flags & DMAP_BABY)) {
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dmap[i].dmap_flags &= ~DMAP_BABY;
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printf("FS: %d execced\n", proc);
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dev_up(i);
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}
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}
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return;
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}
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