244 lines
6.3 KiB
C
244 lines
6.3 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 <minix/ds.h>
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#include "param.h"
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#define NC(x) (NR_CTRLRS >= (x))
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/* The order of the entries in the table determines the mapping between major
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* device numbers and device drivers. Character and block devices
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* can be intermixed at random. The ordering determines the device numbers in
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* /dev. 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. See <minix/dmap.h> for mappings.
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*/
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struct dmap dmap[NR_DEVICES];
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#define DT_EMPTY { no_dev, no_dev_io, NONE, "", 0, STYLE_NDEV, NULL }
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/*===========================================================================*
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* do_mapdriver *
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*===========================================================================*/
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PUBLIC int do_mapdriver()
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{
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int r, flags, major;
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endpoint_t endpoint;
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vir_bytes label_vir;
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size_t label_len;
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char label[LABEL_MAX];
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/* Only RS can map drivers. */
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if (who_e != RS_PROC_NR)
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{
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printf("vfs: unauthorized call of do_mapdriver by proc %d\n",
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who_e);
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return(EPERM);
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}
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/* Get the label */
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label_vir= (vir_bytes)m_in.md_label;
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label_len= m_in.md_label_len;
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if (label_len+1 > sizeof(label))
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{
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printf("vfs:do_mapdriver: label too long\n");
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return EINVAL;
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}
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r= sys_vircopy(who_e, D, label_vir, SELF, D, (vir_bytes)label,
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label_len);
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if (r != OK)
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{
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printf("vfs:do_mapdriver: sys_vircopy failed: %d\n", r);
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return EINVAL;
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}
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label[label_len]= '\0';
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r= ds_retrieve_label_endpt(label, &endpoint);
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if (r != OK)
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{
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printf("vfs:do_mapdriver: ds doesn't know '%s'\n", label);
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return EINVAL;
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}
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/* Try to update device mapping. */
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major= m_in.md_major;
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flags= m_in.md_flags;
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r= map_driver(label, major, endpoint, m_in.md_style, flags);
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return(r);
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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(label, major, proc_nr_e, style, flags)
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const char *label; /* name of the driver */
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int major; /* major number of the device */
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endpoint_t proc_nr_e; /* process number of the driver */
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int style; /* style of the device */
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int flags; /* device flags */
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{
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/* Set a new device driver mapping in the dmap table.
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* If the proc_nr is set to NONE, we're supposed to unmap it.
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*/
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int proc_nr_n;
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size_t len;
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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. */
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if(proc_nr_e == 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 = flags;
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return(OK);
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}
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/* Check process number of new driver if requested. */
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if (! (flags & DRV_FORCED))
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{
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if (isokendpt(proc_nr_e, &proc_nr_n) != OK)
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return(EINVAL);
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}
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if (label != NULL) {
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len= strlen(label);
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if (len+1 > sizeof(dp->dmap_label))
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panic("map_driver: label too long: %d", len);
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strcpy(dp->dmap_label, label);
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}
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/* Try to update the entry. */
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switch (style) {
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case STYLE_DEV:
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dp->dmap_opcl = gen_opcl;
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dp->dmap_io = gen_io;
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break;
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case STYLE_DEVA:
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dp->dmap_opcl = gen_opcl;
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dp->dmap_io = asyn_io;
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break;
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case STYLE_TTY:
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dp->dmap_opcl = tty_opcl;
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dp->dmap_io = gen_io;
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break;
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case STYLE_CTTY:
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dp->dmap_opcl = ctty_opcl;
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dp->dmap_io = ctty_io;
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break;
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case STYLE_CLONE:
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dp->dmap_opcl = clone_opcl;
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dp->dmap_io = gen_io;
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break;
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default:
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return(EINVAL);
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}
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dp->dmap_driver = proc_nr_e;
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dp->dmap_flags = flags;
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dp->dmap_style = style;
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return(OK);
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}
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/*===========================================================================*
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* dmap_unmap_by_endpt *
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*===========================================================================*/
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PUBLIC void dmap_unmap_by_endpt(int proc_nr_e)
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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_e)
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if((r=map_driver(NULL, i, NONE, 0, 0)) != OK)
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printf("FS: unmap of p %d / d %d failed: %d\n", proc_nr_e,i,r);
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return;
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}
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/*===========================================================================*
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* map_service *
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*===========================================================================*/
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PUBLIC int map_service(struct rprocpub *rpub)
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{
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/* Map a new service by storing its device driver properties. */
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int r;
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/* Not a driver, nothing more to do. */
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if(!rpub->dev_nr) {
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return OK;
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}
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/* Map driver. */
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r = map_driver(rpub->label, rpub->dev_nr, rpub->endpoint,
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rpub->dev_style, rpub->dev_flags);
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if(r != OK) {
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return r;
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}
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/* If driver has two major numbers associated, also map the other one. */
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if(rpub->dev_style2 != STYLE_NDEV) {
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r = map_driver(rpub->label, rpub->dev_nr+1, rpub->endpoint,
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rpub->dev_style2, rpub->dev_flags);
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if(r != OK) {
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return r;
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}
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}
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return OK;
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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 empty device <-> driver mappings. */
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int i;
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struct dmap dmap_default = DT_EMPTY;
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for (i=0; i<NR_DEVICES; i++) {
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dmap[i] = dmap_default;
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}
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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(endpoint_t 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_endpt_up *
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*===========================================================================*/
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PUBLIC void dmap_endpt_up(int proc_e)
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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_e) {
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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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