The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/dcons/dcons_os.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-4-Clause
    3  *
    4  * Copyright (C) 2003,2004
    5  *      Hidetoshi Shimokawa. All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. All advertising materials mentioning features or use of this software
   16  *    must display the following acknowledgement:
   17  *
   18  *      This product includes software developed by Hidetoshi Shimokawa.
   19  *
   20  * 4. Neither the name of the author nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  * $FreeBSD: releng/12.0/sys/dev/dcons/dcons_os.c 332489 2018-04-13 20:30:49Z kib $
   37  */
   38 
   39 #include <sys/param.h>
   40 #include <sys/kdb.h>
   41 #include <gdb/gdb.h>
   42 #include <sys/kernel.h>
   43 #include <sys/module.h>
   44 #include <sys/systm.h>
   45 #include <sys/types.h>
   46 #include <sys/conf.h>
   47 #include <sys/cons.h>
   48 #include <sys/consio.h>
   49 #include <sys/tty.h>
   50 #include <sys/malloc.h>
   51 #include <sys/priv.h>
   52 #include <sys/proc.h>
   53 #include <sys/ucred.h>
   54 
   55 #include <machine/bus.h>
   56 
   57 #include <dev/dcons/dcons.h>
   58 #include <dev/dcons/dcons_os.h>
   59 
   60 #include <ddb/ddb.h>
   61 #include <sys/reboot.h>
   62 
   63 #include <sys/sysctl.h>
   64 
   65 #include <vm/vm.h>
   66 #include <vm/vm_param.h>
   67 #include <vm/pmap.h>
   68 
   69 #include "opt_dcons.h"
   70 #include "opt_kdb.h"
   71 #include "opt_gdb.h"
   72 #include "opt_ddb.h"
   73 
   74 
   75 #ifndef DCONS_POLL_HZ
   76 #define DCONS_POLL_HZ   25
   77 #endif
   78 
   79 #ifndef DCONS_POLL_IDLE
   80 #define DCONS_POLL_IDLE 256
   81 #endif
   82 
   83 #ifndef DCONS_BUF_SIZE
   84 #define DCONS_BUF_SIZE (16*1024)
   85 #endif
   86 
   87 #ifndef DCONS_FORCE_CONSOLE
   88 #define DCONS_FORCE_CONSOLE     0       /* Mostly for FreeBSD-4/DragonFly */
   89 #endif
   90 
   91 #ifndef KLD_MODULE
   92 static char bssbuf[DCONS_BUF_SIZE];     /* buf in bss */
   93 #endif
   94 
   95 /* global data */
   96 static struct dcons_global dg;
   97 struct dcons_global *dcons_conf;
   98 static int poll_hz = DCONS_POLL_HZ;
   99 static u_int poll_idle = DCONS_POLL_HZ * DCONS_POLL_IDLE;
  100 
  101 static struct dcons_softc sc[DCONS_NPORT];
  102 
  103 static SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console");
  104 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0,
  105                                 "dcons polling rate");
  106 
  107 static int drv_init = 0;
  108 static struct callout dcons_callout;
  109 struct dcons_buf *dcons_buf;            /* for local dconschat */
  110 
  111 static void     dcons_timeout(void *);
  112 static int      dcons_drv_init(int);
  113 
  114 static cn_probe_t       dcons_cnprobe;
  115 static cn_init_t        dcons_cninit;
  116 static cn_term_t        dcons_cnterm;
  117 static cn_getc_t        dcons_cngetc;
  118 static cn_putc_t        dcons_cnputc;
  119 static cn_grab_t        dcons_cngrab;
  120 static cn_ungrab_t      dcons_cnungrab;
  121 
  122 CONSOLE_DRIVER(dcons);
  123 
  124 #if defined(GDB)
  125 static gdb_probe_f      dcons_dbg_probe;
  126 static gdb_init_f       dcons_dbg_init;
  127 static gdb_term_f       dcons_dbg_term;
  128 static gdb_getc_f       dcons_dbg_getc;
  129 static gdb_putc_f       dcons_dbg_putc;
  130 
  131 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term,
  132     dcons_dbg_getc, dcons_dbg_putc);
  133 
  134 extern struct gdb_dbgport *gdb_cur;
  135 #endif
  136 
  137 static tsw_outwakeup_t dcons_outwakeup;
  138 
  139 static struct ttydevsw dcons_ttydevsw = {
  140         .tsw_flags      = TF_NOPREFIX,
  141         .tsw_outwakeup  = dcons_outwakeup,
  142 };
  143 
  144 #if (defined(GDB) || defined(DDB))
  145 static int
  146 dcons_check_break(struct dcons_softc *dc, int c)
  147 {
  148 
  149         if (c < 0)
  150                 return (c);
  151 
  152 #ifdef GDB
  153         if ((dc->flags & DC_GDB) != 0 && gdb_cur == &dcons_gdb_dbgport)
  154                 kdb_alt_break_gdb(c, &dc->brk_state);
  155         else
  156 #endif
  157                 kdb_alt_break(c, &dc->brk_state);
  158 
  159         return (c);
  160 }
  161 #else
  162 #define dcons_check_break(dc, c)        (c)
  163 #endif
  164 
  165 static int
  166 dcons_os_checkc_nopoll(struct dcons_softc *dc)
  167 {
  168         int c;
  169 
  170         if (dg.dma_tag != NULL)
  171                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD);
  172 
  173         c = dcons_check_break(dc, dcons_checkc(dc));
  174 
  175         if (dg.dma_tag != NULL)
  176                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD);
  177 
  178         return (c);
  179 }
  180 
  181 static int
  182 dcons_os_checkc(struct dcons_softc *dc)
  183 {
  184         EVENTHANDLER_INVOKE(dcons_poll, 0);
  185         return (dcons_os_checkc_nopoll(dc));
  186 }
  187 
  188 static void
  189 dcons_os_putc(struct dcons_softc *dc, int c)
  190 {
  191         if (dg.dma_tag != NULL)
  192                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE);
  193 
  194         dcons_putc(dc, c);
  195 
  196         if (dg.dma_tag != NULL)
  197                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE);
  198 }
  199 
  200 static void
  201 dcons_outwakeup(struct tty *tp)
  202 {
  203         struct dcons_softc *dc;
  204         char ch;
  205 
  206         dc = tty_softc(tp);
  207 
  208         while (ttydisc_getc(tp, &ch, sizeof ch) != 0)
  209                 dcons_os_putc(dc, ch);
  210 }
  211 
  212 static void
  213 dcons_timeout(void *v)
  214 {
  215         struct  tty *tp;
  216         struct dcons_softc *dc;
  217         int i, c, polltime;
  218 
  219         for (i = 0; i < DCONS_NPORT; i ++) {
  220                 dc = &sc[i];
  221                 tp = dc->tty;
  222 
  223                 tty_lock(tp);
  224                 while ((c = dcons_os_checkc_nopoll(dc)) != -1) {
  225                         ttydisc_rint(tp, c, 0);
  226                         poll_idle = 0;
  227                 }
  228                 ttydisc_rint_done(tp);
  229                 tty_unlock(tp);
  230         }
  231         poll_idle++;
  232         polltime = hz;
  233         if (poll_idle <= (poll_hz * DCONS_POLL_IDLE))
  234                 polltime /= poll_hz;
  235         callout_reset(&dcons_callout, polltime, dcons_timeout, tp);
  236 }
  237 
  238 static void
  239 dcons_cnprobe(struct consdev *cp)
  240 {
  241         sprintf(cp->cn_name, "dcons");
  242 #if DCONS_FORCE_CONSOLE
  243         cp->cn_pri = CN_REMOTE;
  244 #else
  245         cp->cn_pri = CN_NORMAL;
  246 #endif
  247 }
  248 
  249 static void
  250 dcons_cninit(struct consdev *cp)
  251 {
  252         dcons_drv_init(0);
  253         cp->cn_arg = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */
  254 }
  255 
  256 static void
  257 dcons_cnterm(struct consdev *cp)
  258 {
  259 }
  260 
  261 static void
  262 dcons_cngrab(struct consdev *cp)
  263 {
  264 }
  265 
  266 static void
  267 dcons_cnungrab(struct consdev *cp)
  268 {
  269 }
  270 
  271 static int
  272 dcons_cngetc(struct consdev *cp)
  273 {
  274         struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
  275         return (dcons_os_checkc(dc));
  276 }
  277 
  278 static void
  279 dcons_cnputc(struct consdev *cp, int c)
  280 {
  281         struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
  282         dcons_os_putc(dc, c);
  283 }
  284 
  285 static int
  286 dcons_drv_init(int stage)
  287 {
  288 #if defined(__i386__) || defined(__amd64__)
  289         quad_t addr, size;
  290 #endif
  291 
  292         if (drv_init)
  293                 return(drv_init);
  294 
  295         drv_init = -1;
  296 
  297         bzero(&dg, sizeof(dg));
  298         dcons_conf = &dg;
  299         dg.cdev = &dcons_consdev;
  300         dg.buf = NULL;
  301         dg.size = DCONS_BUF_SIZE;
  302 
  303 #if defined(__i386__) || defined(__amd64__)
  304         if (getenv_quad("dcons.addr", &addr) > 0 &&
  305             getenv_quad("dcons.size", &size) > 0) {
  306 #ifdef __i386__
  307                 vm_paddr_t pa;
  308                 /*
  309                  * Allow read/write access to dcons buffer.
  310                  */
  311                 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE)
  312                         *vtopte(PMAP_MAP_LOW + pa) |= PG_RW;
  313                 invltlb();
  314 #endif
  315                 /* XXX P to V */
  316 #ifdef __amd64__
  317                 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr);
  318 #else /* __i386__ */
  319                 dg.buf = (struct dcons_buf *)((vm_offset_t)PMAP_MAP_LOW +
  320                     addr);
  321 #endif
  322                 dg.size = size;
  323                 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0)
  324                         dg.buf = NULL;
  325         }
  326 #endif
  327         if (dg.buf != NULL)
  328                 goto ok;
  329 
  330 #ifndef KLD_MODULE
  331         if (stage == 0) { /* XXX or cold */
  332                 /*
  333                  * DCONS_FORCE_CONSOLE == 1 and statically linked.
  334                  * called from cninit(). can't use contigmalloc yet .
  335                  */
  336                 dg.buf = (struct dcons_buf *) bssbuf;
  337                 dcons_init(dg.buf, dg.size, sc);
  338         } else
  339 #endif
  340         {
  341                 /*
  342                  * DCONS_FORCE_CONSOLE == 0 or kernel module case.
  343                  * if the module is loaded after boot,
  344                  * bssbuf could be non-continuous.
  345                  */ 
  346                 dg.buf = (struct dcons_buf *) contigmalloc(dg.size,
  347                         M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul);
  348                 if (dg.buf == NULL)
  349                         return (-1);
  350                 dcons_init(dg.buf, dg.size, sc);
  351         }
  352 
  353 ok:
  354         dcons_buf = dg.buf;
  355 
  356         drv_init = 1;
  357 
  358         return 0;
  359 }
  360 
  361 
  362 static int
  363 dcons_attach_port(int port, char *name, int flags)
  364 {
  365         struct dcons_softc *dc;
  366         struct tty *tp;
  367 
  368         dc = &sc[port];
  369         tp = tty_alloc(&dcons_ttydevsw, dc);
  370         dc->flags = flags;
  371         dc->tty   = tp;
  372         tty_init_console(tp, 0);
  373         tty_makedev(tp, NULL, "%s", name);
  374         return(0);
  375 }
  376 
  377 static int
  378 dcons_attach(void)
  379 {
  380         int polltime;
  381 
  382         dcons_attach_port(DCONS_CON, "dcons", 0);
  383         dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB);
  384         callout_init(&dcons_callout, 1);
  385         polltime = hz / poll_hz;
  386         callout_reset(&dcons_callout, polltime, dcons_timeout, NULL);
  387         return(0);
  388 }
  389 
  390 static int
  391 dcons_detach(int port)
  392 {
  393         struct  tty *tp;
  394         struct dcons_softc *dc;
  395 
  396         dc = &sc[port];
  397         tp = dc->tty;
  398 
  399         tty_lock(tp);
  400         tty_rel_gone(tp);
  401 
  402         return(0);
  403 }
  404 
  405 static int
  406 dcons_modevent(module_t mode, int type, void *data)
  407 {
  408         int err = 0, ret;
  409 
  410         switch (type) {
  411         case MOD_LOAD:
  412                 ret = dcons_drv_init(1);
  413                 if (ret != -1)
  414                         dcons_attach();
  415                 if (ret == 0) {
  416                         dcons_cnprobe(&dcons_consdev);
  417                         dcons_cninit(&dcons_consdev);
  418                         cnadd(&dcons_consdev);
  419                 }
  420                 break;
  421         case MOD_UNLOAD:
  422                 printf("dcons: unload\n");
  423                 if (drv_init == 1) {
  424                         callout_stop(&dcons_callout);
  425                         cnremove(&dcons_consdev);
  426                         dcons_detach(DCONS_CON);
  427                         dcons_detach(DCONS_GDB);
  428                         dg.buf->magic = 0;
  429 
  430                         contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF);
  431                 }
  432 
  433                 break;
  434         case MOD_SHUTDOWN:
  435 #if 0           /* Keep connection after halt */
  436                 dg.buf->magic = 0;
  437 #endif
  438                 break;
  439         default:
  440                 err = EOPNOTSUPP;
  441                 break;
  442         }
  443         return(err);
  444 }
  445 
  446 #if defined(GDB)
  447 /* Debugger interface */
  448 
  449 static int
  450 dcons_os_getc(struct dcons_softc *dc)
  451 {
  452         int c;
  453 
  454         while ((c = dcons_os_checkc(dc)) == -1);
  455 
  456         return (c & 0xff);
  457 }
  458 
  459 static int
  460 dcons_dbg_probe(void)
  461 {
  462         int dcons_gdb;
  463 
  464         if (getenv_int("dcons_gdb", &dcons_gdb) == 0)
  465                 return (-1);
  466         return (dcons_gdb);
  467 }
  468 
  469 static void
  470 dcons_dbg_init(void)
  471 {
  472 }
  473 
  474 static void
  475 dcons_dbg_term(void)
  476 {
  477 }
  478 
  479 static void
  480 dcons_dbg_putc(int c)
  481 {
  482         struct dcons_softc *dc = &sc[DCONS_GDB];
  483         dcons_os_putc(dc, c);
  484 }
  485 
  486 static int
  487 dcons_dbg_getc(void)
  488 {
  489         struct dcons_softc *dc = &sc[DCONS_GDB];
  490         return (dcons_os_getc(dc));
  491 }
  492 #endif
  493 
  494 DEV_MODULE(dcons, dcons_modevent, NULL);
  495 MODULE_VERSION(dcons, DCONS_VERSION);

Cache object: 0dbf0d7801a24cf00c74c9ddd239cdb5


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