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  * Copyright (C) 2003,2004
    3  *      Hidetoshi Shimokawa. All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *
   16  *      This product includes software developed by Hidetoshi Shimokawa.
   17  *
   18  * 4. Neither the name of the author nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  * $FreeBSD: releng/11.0/sys/dev/dcons/dcons_os.c 283291 2015-05-22 17:05:21Z jkim $
   35  */
   36 
   37 #include <sys/param.h>
   38 #include <sys/kdb.h>
   39 #include <gdb/gdb.h>
   40 #include <sys/kernel.h>
   41 #include <sys/module.h>
   42 #include <sys/systm.h>
   43 #include <sys/types.h>
   44 #include <sys/conf.h>
   45 #include <sys/cons.h>
   46 #include <sys/consio.h>
   47 #include <sys/tty.h>
   48 #include <sys/malloc.h>
   49 #include <sys/priv.h>
   50 #include <sys/proc.h>
   51 #include <sys/ucred.h>
   52 
   53 #include <machine/bus.h>
   54 
   55 #include <dev/dcons/dcons.h>
   56 #include <dev/dcons/dcons_os.h>
   57 
   58 #include <ddb/ddb.h>
   59 #include <sys/reboot.h>
   60 
   61 #include <sys/sysctl.h>
   62 
   63 #include <vm/vm.h>
   64 #include <vm/vm_param.h>
   65 #include <vm/pmap.h>
   66 
   67 #include "opt_dcons.h"
   68 #include "opt_kdb.h"
   69 #include "opt_gdb.h"
   70 #include "opt_ddb.h"
   71 
   72 
   73 #ifndef DCONS_POLL_HZ
   74 #define DCONS_POLL_HZ   25
   75 #endif
   76 
   77 #ifndef DCONS_POLL_IDLE
   78 #define DCONS_POLL_IDLE 256
   79 #endif
   80 
   81 #ifndef DCONS_BUF_SIZE
   82 #define DCONS_BUF_SIZE (16*1024)
   83 #endif
   84 
   85 #ifndef DCONS_FORCE_CONSOLE
   86 #define DCONS_FORCE_CONSOLE     0       /* Mostly for FreeBSD-4/DragonFly */
   87 #endif
   88 
   89 #ifndef KLD_MODULE
   90 static char bssbuf[DCONS_BUF_SIZE];     /* buf in bss */
   91 #endif
   92 
   93 /* global data */
   94 static struct dcons_global dg;
   95 struct dcons_global *dcons_conf;
   96 static int poll_hz = DCONS_POLL_HZ;
   97 static u_int poll_idle = DCONS_POLL_HZ * DCONS_POLL_IDLE;
   98 
   99 static struct dcons_softc sc[DCONS_NPORT];
  100 
  101 static SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console");
  102 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0,
  103                                 "dcons polling rate");
  104 
  105 static int drv_init = 0;
  106 static struct callout dcons_callout;
  107 struct dcons_buf *dcons_buf;            /* for local dconschat */
  108 
  109 static void     dcons_timeout(void *);
  110 static int      dcons_drv_init(int);
  111 
  112 static cn_probe_t       dcons_cnprobe;
  113 static cn_init_t        dcons_cninit;
  114 static cn_term_t        dcons_cnterm;
  115 static cn_getc_t        dcons_cngetc;
  116 static cn_putc_t        dcons_cnputc;
  117 static cn_grab_t        dcons_cngrab;
  118 static cn_ungrab_t      dcons_cnungrab;
  119 
  120 CONSOLE_DRIVER(dcons);
  121 
  122 #if defined(GDB)
  123 static gdb_probe_f      dcons_dbg_probe;
  124 static gdb_init_f       dcons_dbg_init;
  125 static gdb_term_f       dcons_dbg_term;
  126 static gdb_getc_f       dcons_dbg_getc;
  127 static gdb_putc_f       dcons_dbg_putc;
  128 
  129 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term,
  130     dcons_dbg_getc, dcons_dbg_putc);
  131 
  132 extern struct gdb_dbgport *gdb_cur;
  133 #endif
  134 
  135 static tsw_outwakeup_t dcons_outwakeup;
  136 
  137 static struct ttydevsw dcons_ttydevsw = {
  138         .tsw_flags      = TF_NOPREFIX,
  139         .tsw_outwakeup  = dcons_outwakeup,
  140 };
  141 
  142 #if (defined(GDB) || defined(DDB))
  143 static int
  144 dcons_check_break(struct dcons_softc *dc, int c)
  145 {
  146 
  147         if (c < 0)
  148                 return (c);
  149 
  150 #ifdef GDB
  151         if ((dc->flags & DC_GDB) != 0 && gdb_cur == &dcons_gdb_dbgport)
  152                 kdb_alt_break_gdb(c, &dc->brk_state);
  153         else
  154 #endif
  155                 kdb_alt_break(c, &dc->brk_state);
  156 
  157         return (c);
  158 }
  159 #else
  160 #define dcons_check_break(dc, c)        (c)
  161 #endif
  162 
  163 static int
  164 dcons_os_checkc_nopoll(struct dcons_softc *dc)
  165 {
  166         int c;
  167 
  168         if (dg.dma_tag != NULL)
  169                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD);
  170 
  171         c = dcons_check_break(dc, dcons_checkc(dc));
  172 
  173         if (dg.dma_tag != NULL)
  174                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD);
  175 
  176         return (c);
  177 }
  178 
  179 static int
  180 dcons_os_checkc(struct dcons_softc *dc)
  181 {
  182         EVENTHANDLER_INVOKE(dcons_poll, 0);
  183         return (dcons_os_checkc_nopoll(dc));
  184 }
  185 
  186 static void
  187 dcons_os_putc(struct dcons_softc *dc, int c)
  188 {
  189         if (dg.dma_tag != NULL)
  190                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE);
  191 
  192         dcons_putc(dc, c);
  193 
  194         if (dg.dma_tag != NULL)
  195                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE);
  196 }
  197 
  198 static void
  199 dcons_outwakeup(struct tty *tp)
  200 {
  201         struct dcons_softc *dc;
  202         char ch;
  203 
  204         dc = tty_softc(tp);
  205 
  206         while (ttydisc_getc(tp, &ch, sizeof ch) != 0)
  207                 dcons_os_putc(dc, ch);
  208 }
  209 
  210 static void
  211 dcons_timeout(void *v)
  212 {
  213         struct  tty *tp;
  214         struct dcons_softc *dc;
  215         int i, c, polltime;
  216 
  217         for (i = 0; i < DCONS_NPORT; i ++) {
  218                 dc = &sc[i];
  219                 tp = dc->tty;
  220 
  221                 tty_lock(tp);
  222                 while ((c = dcons_os_checkc_nopoll(dc)) != -1) {
  223                         ttydisc_rint(tp, c, 0);
  224                         poll_idle = 0;
  225                 }
  226                 ttydisc_rint_done(tp);
  227                 tty_unlock(tp);
  228         }
  229         poll_idle++;
  230         polltime = hz;
  231         if (poll_idle <= (poll_hz * DCONS_POLL_IDLE))
  232                 polltime /= poll_hz;
  233         callout_reset(&dcons_callout, polltime, dcons_timeout, tp);
  234 }
  235 
  236 static void
  237 dcons_cnprobe(struct consdev *cp)
  238 {
  239         sprintf(cp->cn_name, "dcons");
  240 #if DCONS_FORCE_CONSOLE
  241         cp->cn_pri = CN_REMOTE;
  242 #else
  243         cp->cn_pri = CN_NORMAL;
  244 #endif
  245 }
  246 
  247 static void
  248 dcons_cninit(struct consdev *cp)
  249 {
  250         dcons_drv_init(0);
  251         cp->cn_arg = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */
  252 }
  253 
  254 static void
  255 dcons_cnterm(struct consdev *cp)
  256 {
  257 }
  258 
  259 static void
  260 dcons_cngrab(struct consdev *cp)
  261 {
  262 }
  263 
  264 static void
  265 dcons_cnungrab(struct consdev *cp)
  266 {
  267 }
  268 
  269 static int
  270 dcons_cngetc(struct consdev *cp)
  271 {
  272         struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
  273         return (dcons_os_checkc(dc));
  274 }
  275 
  276 static void
  277 dcons_cnputc(struct consdev *cp, int c)
  278 {
  279         struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
  280         dcons_os_putc(dc, c);
  281 }
  282 
  283 static int
  284 dcons_drv_init(int stage)
  285 {
  286 #if defined(__i386__) || defined(__amd64__)
  287         quad_t addr, size;
  288 #endif
  289 
  290         if (drv_init)
  291                 return(drv_init);
  292 
  293         drv_init = -1;
  294 
  295         bzero(&dg, sizeof(dg));
  296         dcons_conf = &dg;
  297         dg.cdev = &dcons_consdev;
  298         dg.buf = NULL;
  299         dg.size = DCONS_BUF_SIZE;
  300 
  301 #if defined(__i386__) || defined(__amd64__)
  302         if (getenv_quad("dcons.addr", &addr) > 0 &&
  303             getenv_quad("dcons.size", &size) > 0) {
  304 #ifdef __i386__
  305                 vm_paddr_t pa;
  306                 /*
  307                  * Allow read/write access to dcons buffer.
  308                  */
  309                 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE)
  310                         *vtopte(KERNBASE + pa) |= PG_RW;
  311                 invltlb();
  312 #endif
  313                 /* XXX P to V */
  314                 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr);
  315                 dg.size = size;
  316                 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0)
  317                         dg.buf = NULL;
  318         }
  319 #endif
  320         if (dg.buf != NULL)
  321                 goto ok;
  322 
  323 #ifndef KLD_MODULE
  324         if (stage == 0) { /* XXX or cold */
  325                 /*
  326                  * DCONS_FORCE_CONSOLE == 1 and statically linked.
  327                  * called from cninit(). can't use contigmalloc yet .
  328                  */
  329                 dg.buf = (struct dcons_buf *) bssbuf;
  330                 dcons_init(dg.buf, dg.size, sc);
  331         } else
  332 #endif
  333         {
  334                 /*
  335                  * DCONS_FORCE_CONSOLE == 0 or kernel module case.
  336                  * if the module is loaded after boot,
  337                  * bssbuf could be non-continuous.
  338                  */ 
  339                 dg.buf = (struct dcons_buf *) contigmalloc(dg.size,
  340                         M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul);
  341                 if (dg.buf == NULL)
  342                         return (-1);
  343                 dcons_init(dg.buf, dg.size, sc);
  344         }
  345 
  346 ok:
  347         dcons_buf = dg.buf;
  348 
  349         drv_init = 1;
  350 
  351         return 0;
  352 }
  353 
  354 
  355 static int
  356 dcons_attach_port(int port, char *name, int flags)
  357 {
  358         struct dcons_softc *dc;
  359         struct tty *tp;
  360 
  361         dc = &sc[port];
  362         tp = tty_alloc(&dcons_ttydevsw, dc);
  363         dc->flags = flags;
  364         dc->tty   = tp;
  365         tty_init_console(tp, 0);
  366         tty_makedev(tp, NULL, "%s", name);
  367         return(0);
  368 }
  369 
  370 static int
  371 dcons_attach(void)
  372 {
  373         int polltime;
  374 
  375         dcons_attach_port(DCONS_CON, "dcons", 0);
  376         dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB);
  377         callout_init(&dcons_callout, 1);
  378         polltime = hz / poll_hz;
  379         callout_reset(&dcons_callout, polltime, dcons_timeout, NULL);
  380         return(0);
  381 }
  382 
  383 static int
  384 dcons_detach(int port)
  385 {
  386         struct  tty *tp;
  387         struct dcons_softc *dc;
  388 
  389         dc = &sc[port];
  390         tp = dc->tty;
  391 
  392         tty_lock(tp);
  393         tty_rel_gone(tp);
  394 
  395         return(0);
  396 }
  397 
  398 static int
  399 dcons_modevent(module_t mode, int type, void *data)
  400 {
  401         int err = 0, ret;
  402 
  403         switch (type) {
  404         case MOD_LOAD:
  405                 ret = dcons_drv_init(1);
  406                 if (ret != -1)
  407                         dcons_attach();
  408                 if (ret == 0) {
  409                         dcons_cnprobe(&dcons_consdev);
  410                         dcons_cninit(&dcons_consdev);
  411                         cnadd(&dcons_consdev);
  412                 }
  413                 break;
  414         case MOD_UNLOAD:
  415                 printf("dcons: unload\n");
  416                 if (drv_init == 1) {
  417                         callout_stop(&dcons_callout);
  418                         cnremove(&dcons_consdev);
  419                         dcons_detach(DCONS_CON);
  420                         dcons_detach(DCONS_GDB);
  421                         dg.buf->magic = 0;
  422 
  423                         contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF);
  424                 }
  425 
  426                 break;
  427         case MOD_SHUTDOWN:
  428 #if 0           /* Keep connection after halt */
  429                 dg.buf->magic = 0;
  430 #endif
  431                 break;
  432         default:
  433                 err = EOPNOTSUPP;
  434                 break;
  435         }
  436         return(err);
  437 }
  438 
  439 #if defined(GDB)
  440 /* Debugger interface */
  441 
  442 static int
  443 dcons_os_getc(struct dcons_softc *dc)
  444 {
  445         int c;
  446 
  447         while ((c = dcons_os_checkc(dc)) == -1);
  448 
  449         return (c & 0xff);
  450 }
  451 
  452 static int
  453 dcons_dbg_probe(void)
  454 {
  455         int dcons_gdb;
  456 
  457         if (getenv_int("dcons_gdb", &dcons_gdb) == 0)
  458                 return (-1);
  459         return (dcons_gdb);
  460 }
  461 
  462 static void
  463 dcons_dbg_init(void)
  464 {
  465 }
  466 
  467 static void
  468 dcons_dbg_term(void)
  469 {
  470 }
  471 
  472 static void
  473 dcons_dbg_putc(int c)
  474 {
  475         struct dcons_softc *dc = &sc[DCONS_GDB];
  476         dcons_os_putc(dc, c);
  477 }
  478 
  479 static int
  480 dcons_dbg_getc(void)
  481 {
  482         struct dcons_softc *dc = &sc[DCONS_GDB];
  483         return (dcons_os_getc(dc));
  484 }
  485 #endif
  486 
  487 DEV_MODULE(dcons, dcons_modevent, NULL);
  488 MODULE_VERSION(dcons, DCONS_VERSION);

Cache object: e098e4ffa7922f54e51847c9d67a876b


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