subr_hints.c

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    1 /*-
    2  * Copyright (c) 2000,2001 Peter Wemm <peter@FreeBSD.org>
    3  * 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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/5.0/sys/kern/subr_hints.c 95839 2002-05-01 02:51:50Z peter $
   27  */
   28 
   29 #include <sys/param.h>
   30 #include <sys/lock.h>
   31 #include <sys/sx.h>
   32 #include <sys/systm.h>
   33 #include <sys/bus.h>
   34 
   35 /*
   36  * Access functions for device resources.
   37  */
   38 
   39 static int checkmethod = 1;
   40 static int use_kenv;
   41 static char *hintp;
   42 
   43 /*
   44  * Evil wildcarding resource string lookup.
   45  * This walks the supplied env string table and returns a match.
   46  * The start point can be remembered for incremental searches.
   47  */
   48 static int
   49 res_find(int *line, int *startln,
   50     const char *name, int *unit, const char *resname, const char *value,
   51     const char **ret_name, int *ret_namelen, int *ret_unit,
   52     const char **ret_resname, int *ret_resnamelen, const char **ret_value)
   53 {
   54         int n = 0, hit, i = 0;
   55         char r_name[32];
   56         int r_unit;
   57         char r_resname[32];
   58         char r_value[128];
   59         const char *s, *cp;
   60         char *p;
   61 
   62         if (checkmethod) {
   63                 switch (hintmode) {
   64                 case 0:         /* loader hints in environment only */
   65                         break;
   66                 case 1:         /* static hints only */
   67                         hintp = static_hints;
   68                         checkmethod = 0;
   69                         break;
   70                 case 2:         /* fallback mode */
   71                         if (dynamic_kenv) {
   72                                 sx_slock(&kenv_lock);
   73                                 cp = kenvp[0];
   74                                 for (i = 0; cp != NULL; cp = kenvp[++i]) {
   75                                         if (!strncmp(cp, "hint.", 5)) {
   76                                                 use_kenv = 1;
   77                                                 checkmethod = 0;
   78                                                 break;
   79                                         }
   80                                 }
   81                                 sx_sunlock(&kenv_lock);
   82                         } else {
   83                                 cp = kern_envp;
   84                                 while (cp) {
   85                                         if (strncmp(cp, "hint.", 5) == 0) {
   86                                                 cp = NULL;
   87                                                 hintp = kern_envp;
   88                                                 break;
   89                                         }
   90                                         while (*cp != '\0')
   91                                                 cp++;
   92                                         cp++;
   93                                         if (*cp == '\0') {
   94                                                 cp = NULL;
   95                                                 hintp = static_hints;
   96                                                 break;
   97                                         }
   98                                 }
   99                         }
  100                         break;
  101                 default:
  102                         break;
  103                 }
  104                 if (hintp == NULL) {
  105                         if (dynamic_kenv) {
  106                                 use_kenv = 1;
  107                                 checkmethod = 0;
  108                         } else
  109                                 hintp = kern_envp;
  110                 }
  111         }
  112 
  113         if (use_kenv) {
  114                 sx_slock(&kenv_lock);
  115                 i = 0;
  116                 cp = kenvp[0];
  117                 if (cp == NULL) {
  118                         sx_sunlock(&kenv_lock);
  119                         return (ENOENT);
  120                 }
  121         } else
  122                 cp = hintp;
  123         while (cp) {
  124                 hit = 1;
  125                 (*line)++;
  126                 if (strncmp(cp, "hint.", 5) != 0)
  127                         hit = 0;
  128                 else
  129                         n = sscanf(cp, "hint.%32[^.].%d.%32[^=]=%128s",
  130                             r_name, &r_unit, r_resname, r_value);
  131                 if (hit && n != 4) {
  132                         printf("CONFIG: invalid hint '%s'\n", cp);
  133                         /* XXX: abuse bogus index() declaration */
  134                         p = index(cp, 'h');
  135                         *p = 'H';
  136                         hit = 0;
  137                 }
  138                 if (hit && startln && *startln >= 0 && *line < *startln)
  139                         hit = 0;
  140                 if (hit && name && strcmp(name, r_name) != 0)
  141                         hit = 0;
  142                 if (hit && unit && *unit != r_unit)
  143                         hit = 0;
  144                 if (hit && resname && strcmp(resname, r_resname) != 0)
  145                         hit = 0;
  146                 if (hit && value && strcmp(value, r_value) != 0)
  147                         hit = 0;
  148                 if (hit)
  149                         break;
  150                 if (use_kenv) {
  151                         cp = kenvp[++i];
  152                         if (cp == NULL)
  153                                 break;
  154                 } else {
  155                         while (*cp != '\0')
  156                                 cp++;
  157                         cp++;
  158                         if (*cp == '\0') {
  159                                 cp = NULL;
  160                                 break;
  161                         }
  162                 }
  163         }
  164         if (use_kenv)
  165                 sx_sunlock(&kenv_lock);
  166         if (cp == NULL)
  167                 return ENOENT;
  168 
  169         s = cp;
  170         /* This is a bit of a hack, but at least is reentrant */
  171         /* Note that it returns some !unterminated! strings. */
  172         s = index(s, '.') + 1;          /* start of device */
  173         if (ret_name)
  174                 *ret_name = s;
  175         s = index(s, '.') + 1;          /* start of unit */
  176         if (ret_namelen)
  177                 *ret_namelen = s - *ret_name - 1; /* device length */
  178         if (ret_unit)
  179                 *ret_unit = r_unit;
  180         s = index(s, '.') + 1;          /* start of resname */
  181         if (ret_resname)
  182                 *ret_resname = s;
  183         s = index(s, '=') + 1;          /* start of value */
  184         if (ret_resnamelen)
  185                 *ret_resnamelen = s - *ret_resname - 1; /* value len */
  186         if (ret_value)
  187                 *ret_value = s;
  188         if (startln)                    /* line number for anchor */
  189                 *startln = *line + 1;
  190         return 0;
  191 }
  192 
  193 /*
  194  * Search all the data sources for matches to our query.  We look for
  195  * dynamic hints first as overrides for static or fallback hints.
  196  */
  197 static int
  198 resource_find(int *line, int *startln,
  199     const char *name, int *unit, const char *resname, const char *value,
  200     const char **ret_name, int *ret_namelen, int *ret_unit,
  201     const char **ret_resname, int *ret_resnamelen, const char **ret_value)
  202 {
  203         int i;
  204         int un;
  205 
  206         *line = 0;
  207 
  208         /* Search for exact unit matches first */
  209         i = res_find(line, startln, name, unit, resname, value,
  210             ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
  211             ret_value);
  212         if (i == 0)
  213                 return 0;
  214         if (unit == NULL)
  215                 return ENOENT;
  216         /* If we are still here, search for wildcard matches */
  217         un = -1;
  218         i = res_find(line, startln, name, &un, resname, value,
  219             ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
  220             ret_value);
  221         if (i == 0)
  222                 return 0;
  223         return ENOENT;
  224 }
  225 
  226 int
  227 resource_int_value(const char *name, int unit, const char *resname, int *result)
  228 {
  229         int error;
  230         const char *str;
  231         char *op;
  232         unsigned long val;
  233         int line;
  234 
  235         line = 0;
  236         error = resource_find(&line, NULL, name, &unit, resname, NULL,
  237             NULL, NULL, NULL, NULL, NULL, &str);
  238         if (error)
  239                 return error;
  240         if (*str == '\0') 
  241                 return EFTYPE;
  242         val = strtoul(str, &op, 0);
  243         if (*op != '\0') 
  244                 return EFTYPE;
  245         *result = val;
  246         return 0;
  247 }
  248 
  249 int
  250 resource_long_value(const char *name, int unit, const char *resname,
  251     long *result)
  252 {
  253         int error;
  254         const char *str;
  255         char *op;
  256         unsigned long val;
  257         int line;
  258 
  259         line = 0;
  260         error = resource_find(&line, NULL, name, &unit, resname, NULL,
  261             NULL, NULL, NULL, NULL, NULL, &str);
  262         if (error)
  263                 return error;
  264         if (*str == '\0') 
  265                 return EFTYPE;
  266         val = strtoul(str, &op, 0);
  267         if (*op != '\0') 
  268                 return EFTYPE;
  269         *result = val;
  270         return 0;
  271 }
  272 
  273 int
  274 resource_string_value(const char *name, int unit, const char *resname,
  275     const char **result)
  276 {
  277         int error;
  278         const char *str;
  279         int line;
  280 
  281         line = 0;
  282         error = resource_find(&line, NULL, name, &unit, resname, NULL,
  283             NULL, NULL, NULL, NULL, NULL, &str);
  284         if (error)
  285                 return error;
  286         *result = str;
  287         return 0;
  288 }
  289 
  290 /*
  291  * This is a bit nasty, but allows us to not modify the env strings.
  292  */
  293 static const char *
  294 resource_string_copy(const char *s, int len)
  295 {
  296         static char stringbuf[256];
  297         static int offset = 0;
  298         const char *ret;
  299 
  300         if (len == 0)
  301                 len = strlen(s);
  302         if (len > 255)
  303                 return NULL;
  304         if ((offset + len + 1) > 255)
  305                 offset = 0;
  306         bcopy(s, &stringbuf[offset], len);
  307         stringbuf[offset + len] = '\0';
  308         ret = &stringbuf[offset];
  309         offset += len + 1;
  310         return ret;
  311 }
  312 
  313 /*
  314  * err = resource_find_at(&anchor, &name, &unit, resname, value)
  315  * Iteratively fetch a list of devices wired "at" something
  316  * res and value are restrictions.  eg: "at", "scbus0".
  317  * For practical purposes, res = required, value = optional.
  318  * *name and *unit are set.
  319  * set *anchor to zero before starting.
  320  */
  321 int
  322 resource_find_match(int *anchor, const char **name, int *unit,
  323     const char *resname, const char *value)
  324 {
  325         const char *found_name;
  326         int found_namelen;
  327         int found_unit;
  328         int ret;
  329         int newln;
  330 
  331         newln = *anchor;
  332         ret = resource_find(anchor, &newln, NULL, NULL, resname, value,
  333             &found_name, &found_namelen, &found_unit, NULL, NULL, NULL);
  334         if (ret == 0) {
  335                 *name = resource_string_copy(found_name, found_namelen);
  336                 *unit = found_unit;
  337         }
  338         *anchor = newln;
  339         return ret;
  340 }
  341 
  342 
  343 /*
  344  * err = resource_find_dev(&anchor, name, &unit, res, value);
  345  * Iterate through a list of devices, returning their unit numbers.
  346  * res and value are optional restrictions.  eg: "at", "scbus0".
  347  * *unit is set to the value.
  348  * set *anchor to zero before starting.
  349  */
  350 int
  351 resource_find_dev(int *anchor, const char *name, int *unit,
  352     const char *resname, const char *value)
  353 {
  354         int found_unit;
  355         int newln;
  356         int ret;
  357 
  358         newln = *anchor;
  359         ret = resource_find(anchor, &newln, name, NULL, resname, value,
  360             NULL, NULL, &found_unit, NULL, NULL, NULL);
  361         if (ret == 0) {
  362                 *unit = found_unit;
  363         }
  364         *anchor = newln;
  365         return ret;
  366 }
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FreeBSD/Linux Kernel Cross Reference sys/kern/subr_hints.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_hints.c
