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/9.1/sys/dev/dcons/dcons_os.c 235405 2012-05-13 17:04:46Z avg $
   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_BUF_SIZE
   78 #define DCONS_BUF_SIZE (16*1024)
   79 #endif
   80 
   81 #ifndef DCONS_FORCE_CONSOLE
   82 #define DCONS_FORCE_CONSOLE     0       /* Mostly for FreeBSD-4/DragonFly */
   83 #endif
   84 
   85 #ifndef KLD_MODULE
   86 static char bssbuf[DCONS_BUF_SIZE];     /* buf in bss */
   87 #endif
   88 
   89 /* global data */
   90 static struct dcons_global dg;
   91 struct dcons_global *dcons_conf;
   92 static int poll_hz = DCONS_POLL_HZ;
   93 
   94 static struct dcons_softc sc[DCONS_NPORT];
   95 
   96 SYSCTL_NODE(_kern, OID_AUTO, dcons, CTLFLAG_RD, 0, "Dumb Console");
   97 SYSCTL_INT(_kern_dcons, OID_AUTO, poll_hz, CTLFLAG_RW, &poll_hz, 0,
   98                                 "dcons polling rate");
   99 
  100 static int drv_init = 0;
  101 static struct callout dcons_callout;
  102 struct dcons_buf *dcons_buf;            /* for local dconschat */
  103 
  104 static void     dcons_timeout(void *);
  105 static int      dcons_drv_init(int);
  106 
  107 static cn_probe_t       dcons_cnprobe;
  108 static cn_init_t        dcons_cninit;
  109 static cn_term_t        dcons_cnterm;
  110 static cn_getc_t        dcons_cngetc;
  111 static cn_putc_t        dcons_cnputc;
  112 static cn_grab_t        dcons_cngrab;
  113 static cn_ungrab_t      dcons_cnungrab;
  114 
  115 CONSOLE_DRIVER(dcons);
  116 
  117 #if defined(GDB)
  118 static gdb_probe_f      dcons_dbg_probe;
  119 static gdb_init_f       dcons_dbg_init;
  120 static gdb_term_f       dcons_dbg_term;
  121 static gdb_getc_f       dcons_dbg_getc;
  122 static gdb_putc_f       dcons_dbg_putc;
  123 
  124 GDB_DBGPORT(dcons, dcons_dbg_probe, dcons_dbg_init, dcons_dbg_term,
  125     dcons_dbg_getc, dcons_dbg_putc);
  126 
  127 extern struct gdb_dbgport *gdb_cur;
  128 #endif
  129 
  130 static tsw_outwakeup_t dcons_outwakeup;
  131 
  132 static struct ttydevsw dcons_ttydevsw = {
  133         .tsw_flags      = TF_NOPREFIX,
  134         .tsw_outwakeup  = dcons_outwakeup,
  135 };
  136 
  137 #if (defined(GDB) || defined(DDB))
  138 static int
  139 dcons_check_break(struct dcons_softc *dc, int c)
  140 {
  141 
  142         if (c < 0)
  143                 return (c);
  144 
  145 #ifdef GDB
  146         if ((dc->flags & DC_GDB) != 0 && gdb_cur == &dcons_gdb_dbgport)
  147                 kdb_alt_break_gdb(c, &dc->brk_state);
  148         else
  149 #endif
  150                 kdb_alt_break(c, &dc->brk_state);
  151 
  152         return (c);
  153 }
  154 #else
  155 #define dcons_check_break(dc, c)        (c)
  156 #endif
  157 
  158 static int
  159 dcons_os_checkc_nopoll(struct dcons_softc *dc)
  160 {
  161         int c;
  162 
  163         if (dg.dma_tag != NULL)
  164                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTREAD);
  165 
  166         c = dcons_check_break(dc, dcons_checkc(dc));
  167 
  168         if (dg.dma_tag != NULL)
  169                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREREAD);
  170 
  171         return (c);
  172 }
  173 
  174 static int
  175 dcons_os_checkc(struct dcons_softc *dc)
  176 {
  177         EVENTHANDLER_INVOKE(dcons_poll, 0);
  178         return (dcons_os_checkc_nopoll(dc));
  179 }
  180 
  181 static void
  182 dcons_os_putc(struct dcons_softc *dc, int c)
  183 {
  184         if (dg.dma_tag != NULL)
  185                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_POSTWRITE);
  186 
  187         dcons_putc(dc, c);
  188 
  189         if (dg.dma_tag != NULL)
  190                 bus_dmamap_sync(dg.dma_tag, dg.dma_map, BUS_DMASYNC_PREWRITE);
  191 }
  192 
  193 static void
  194 dcons_outwakeup(struct tty *tp)
  195 {
  196         struct dcons_softc *dc;
  197         char ch;
  198 
  199         dc = tty_softc(tp);
  200 
  201         while (ttydisc_getc(tp, &ch, sizeof ch) != 0)
  202                 dcons_os_putc(dc, ch);
  203 }
  204 
  205 static void
  206 dcons_timeout(void *v)
  207 {
  208         struct  tty *tp;
  209         struct dcons_softc *dc;
  210         int i, c, polltime;
  211 
  212         for (i = 0; i < DCONS_NPORT; i ++) {
  213                 dc = &sc[i];
  214                 tp = dc->tty;
  215 
  216                 tty_lock(tp);
  217                 while ((c = dcons_os_checkc_nopoll(dc)) != -1)
  218                         ttydisc_rint(tp, c, 0);
  219                 ttydisc_rint_done(tp);
  220                 tty_unlock(tp);
  221         }
  222         polltime = hz / poll_hz;
  223         if (polltime < 1)
  224                 polltime = 1;
  225         callout_reset(&dcons_callout, polltime, dcons_timeout, tp);
  226 }
  227 
  228 static void
  229 dcons_cnprobe(struct consdev *cp)
  230 {
  231         sprintf(cp->cn_name, "dcons");
  232 #if DCONS_FORCE_CONSOLE
  233         cp->cn_pri = CN_REMOTE;
  234 #else
  235         cp->cn_pri = CN_NORMAL;
  236 #endif
  237 }
  238 
  239 static void
  240 dcons_cninit(struct consdev *cp)
  241 {
  242         dcons_drv_init(0);
  243         cp->cn_arg = (void *)&sc[DCONS_CON]; /* share port0 with unit0 */
  244 }
  245 
  246 static void
  247 dcons_cnterm(struct consdev *cp)
  248 {
  249 }
  250 
  251 static void
  252 dcons_cngrab(struct consdev *cp)
  253 {
  254 }
  255 
  256 static void
  257 dcons_cnungrab(struct consdev *cp)
  258 {
  259 }
  260 
  261 static int
  262 dcons_cngetc(struct consdev *cp)
  263 {
  264         struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
  265         return (dcons_os_checkc(dc));
  266 }
  267 
  268 static void
  269 dcons_cnputc(struct consdev *cp, int c)
  270 {
  271         struct dcons_softc *dc = (struct dcons_softc *)cp->cn_arg;
  272         dcons_os_putc(dc, c);
  273 }
  274 
  275 static int
  276 dcons_drv_init(int stage)
  277 {
  278 #if defined(__i386__) || defined(__amd64__)
  279         quad_t addr, size;
  280 #endif
  281 
  282         if (drv_init)
  283                 return(drv_init);
  284 
  285         drv_init = -1;
  286 
  287         bzero(&dg, sizeof(dg));
  288         dcons_conf = &dg;
  289         dg.cdev = &dcons_consdev;
  290         dg.buf = NULL;
  291         dg.size = DCONS_BUF_SIZE;
  292 
  293 #if defined(__i386__) || defined(__amd64__)
  294         if (getenv_quad("dcons.addr", &addr) > 0 &&
  295             getenv_quad("dcons.size", &size) > 0) {
  296 #ifdef __i386__
  297                 vm_paddr_t pa;
  298                 /*
  299                  * Allow read/write access to dcons buffer.
  300                  */
  301                 for (pa = trunc_page(addr); pa < addr + size; pa += PAGE_SIZE)
  302                         *vtopte(KERNBASE + pa) |= PG_RW;
  303                 invltlb();
  304 #endif
  305                 /* XXX P to V */
  306                 dg.buf = (struct dcons_buf *)(vm_offset_t)(KERNBASE + addr);
  307                 dg.size = size;
  308                 if (dcons_load_buffer(dg.buf, dg.size, sc) < 0)
  309                         dg.buf = NULL;
  310         }
  311 #endif
  312         if (dg.buf != NULL)
  313                 goto ok;
  314 
  315 #ifndef KLD_MODULE
  316         if (stage == 0) { /* XXX or cold */
  317                 /*
  318                  * DCONS_FORCE_CONSOLE == 1 and statically linked.
  319                  * called from cninit(). can't use contigmalloc yet .
  320                  */
  321                 dg.buf = (struct dcons_buf *) bssbuf;
  322                 dcons_init(dg.buf, dg.size, sc);
  323         } else
  324 #endif
  325         {
  326                 /*
  327                  * DCONS_FORCE_CONSOLE == 0 or kernel module case.
  328                  * if the module is loaded after boot,
  329                  * bssbuf could be non-continuous.
  330                  */ 
  331                 dg.buf = (struct dcons_buf *) contigmalloc(dg.size,
  332                         M_DEVBUF, 0, 0x10000, 0xffffffff, PAGE_SIZE, 0ul);
  333                 if (dg.buf == NULL)
  334                         return (-1);
  335                 dcons_init(dg.buf, dg.size, sc);
  336         }
  337 
  338 ok:
  339         dcons_buf = dg.buf;
  340 
  341         drv_init = 1;
  342 
  343         return 0;
  344 }
  345 
  346 
  347 static int
  348 dcons_attach_port(int port, char *name, int flags)
  349 {
  350         struct dcons_softc *dc;
  351         struct tty *tp;
  352 
  353         dc = &sc[port];
  354         tp = tty_alloc(&dcons_ttydevsw, dc);
  355         dc->flags = flags;
  356         dc->tty   = tp;
  357         tty_init_console(tp, 0);
  358         tty_makedev(tp, NULL, "%s", name);
  359         return(0);
  360 }
  361 
  362 static int
  363 dcons_attach(void)
  364 {
  365         int polltime;
  366 
  367         dcons_attach_port(DCONS_CON, "dcons", 0);
  368         dcons_attach_port(DCONS_GDB, "dgdb", DC_GDB);
  369         callout_init(&dcons_callout, CALLOUT_MPSAFE);
  370         polltime = hz / poll_hz;
  371         if (polltime < 1)
  372                 polltime = 1;
  373         callout_reset(&dcons_callout, polltime, dcons_timeout, NULL);
  374         return(0);
  375 }
  376 
  377 static int
  378 dcons_detach(int port)
  379 {
  380         struct  tty *tp;
  381         struct dcons_softc *dc;
  382 
  383         dc = &sc[port];
  384         tp = dc->tty;
  385 
  386         tty_lock(tp);
  387         tty_rel_gone(tp);
  388 
  389         return(0);
  390 }
  391 
  392 static int
  393 dcons_modevent(module_t mode, int type, void *data)
  394 {
  395         int err = 0, ret;
  396 
  397         switch (type) {
  398         case MOD_LOAD:
  399                 ret = dcons_drv_init(1);
  400                 if (ret != -1)
  401                         dcons_attach();
  402                 if (ret == 0) {
  403                         dcons_cnprobe(&dcons_consdev);
  404                         dcons_cninit(&dcons_consdev);
  405                         cnadd(&dcons_consdev);
  406                 }
  407                 break;
  408         case MOD_UNLOAD:
  409                 printf("dcons: unload\n");
  410                 if (drv_init == 1) {
  411                         callout_stop(&dcons_callout);
  412                         cnremove(&dcons_consdev);
  413                         dcons_detach(DCONS_CON);
  414                         dcons_detach(DCONS_GDB);
  415                         dg.buf->magic = 0;
  416 
  417                         contigfree(dg.buf, DCONS_BUF_SIZE, M_DEVBUF);
  418                 }
  419 
  420                 break;
  421         case MOD_SHUTDOWN:
  422 #if 0           /* Keep connection after halt */
  423                 dg.buf->magic = 0;
  424 #endif
  425                 break;
  426         default:
  427                 err = EOPNOTSUPP;
  428                 break;
  429         }
  430         return(err);
  431 }
  432 
  433 #if defined(GDB)
  434 /* Debugger interface */
  435 
  436 static int
  437 dcons_os_getc(struct dcons_softc *dc)
  438 {
  439         int c;
  440 
  441         while ((c = dcons_os_checkc(dc)) == -1);
  442 
  443         return (c & 0xff);
  444 }
  445 
  446 static int
  447 dcons_dbg_probe(void)
  448 {
  449         int dcons_gdb;
  450 
  451         if (getenv_int("dcons_gdb", &dcons_gdb) == 0)
  452                 return (-1);
  453         return (dcons_gdb);
  454 }
  455 
  456 static void
  457 dcons_dbg_init(void)
  458 {
  459 }
  460 
  461 static void
  462 dcons_dbg_term(void)
  463 {
  464 }
  465 
  466 static void
  467 dcons_dbg_putc(int c)
  468 {
  469         struct dcons_softc *dc = &sc[DCONS_GDB];
  470         dcons_os_putc(dc, c);
  471 }
  472 
  473 static int
  474 dcons_dbg_getc(void)
  475 {
  476         struct dcons_softc *dc = &sc[DCONS_GDB];
  477         return (dcons_os_getc(dc));
  478 }
  479 #endif
  480 
  481 DEV_MODULE(dcons, dcons_modevent, NULL);
  482 MODULE_VERSION(dcons, DCONS_VERSION);

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