e12d0ec43a
Allow the MI code to override the preferred console (eg. so that an RB_SERIAL flag from the i386 boot2 can override the default first active console) isapnp.c Use the standard format for ISA PnP IDs. pnp.c Allow trailing comments on lines, be less picky about line contents. ls.c Cosmetic error message fix. panic.c Print the right arguments.
286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
/*
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* mjs copyright
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*/
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/*
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* "Plug and Play" functionality.
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*
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* We use the PnP enumerators to obtain identifiers for installed hardware,
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* and the contents of a database to determine modules to be loaded to support
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* such hardware.
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*/
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#include <stand.h>
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#include <string.h>
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#include <bootstrap.h>
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static struct pnpinfo *pnp_devices = NULL;
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static void pnp_discard(struct pnpinfo **list);
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static int pnp_readconf(char *path);
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static int pnp_scankernel(void);
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/*
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* Perform complete enumeration sweep, and load required module(s) if possible.
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*/
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COMMAND_SET(pnpscan, "pnpscan", "scan for PnP devices", pnp_scan);
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int
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pnp_scan(int argc, char *argv[])
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{
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int hdlr;
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/* forget anything we think we knew */
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pnp_discard(&pnp_devices);
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/* iterate over all of the handlers */
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for (hdlr = 0; pnphandlers[hdlr] != NULL; hdlr++) {
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printf("Probing bus '%s'...\n", pnphandlers[hdlr]->pp_name);
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pnphandlers[hdlr]->pp_enumerate(&pnp_devices);
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}
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return(CMD_OK);
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}
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/*
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* Try to load outstanding modules (eg. after disk change)
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*/
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int
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pnp_reload(char *fname)
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{
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struct pnpinfo *pi;
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char *modfname;
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/* find anything? */
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if (pnp_devices != NULL) {
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/* check for kernel, assign modules handled by static drivers there */
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if (pnp_scankernel()) {
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command_errmsg = "cannot load drivers until kernel loaded";
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return(CMD_ERROR);
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}
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if (fname == NULL) {
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/* default paths */
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pnp_readconf("/boot/pnpdata.local");
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pnp_readconf("/boot/pnpdata");
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} else {
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if (pnp_readconf("fname")) {
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sprintf(command_errbuf, "can't read PnP information from '%s'", fname);
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return(CMD_ERROR);
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}
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}
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/* try to load any modules that have been nominated */
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for (pi = pnp_devices; pi != NULL; pi = pi->pi_next) {
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/* Already loaded? */
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if ((pi->pi_module != NULL) && (mod_findmodule(pi->pi_module, NULL) == NULL)) {
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modfname = malloc(strlen(pi->pi_module + 3));
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sprintf(modfname, "%s.ko", pi->pi_module); /* XXX implicit knowledge of KLD module filenames */
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if (mod_load(pi->pi_module, pi->pi_argc, pi->pi_argv))
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printf("Could not load module '%s' for device '%s'\n", modfname, pi->pi_ident->id_ident);
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free(modfname);
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}
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}
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}
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return(CMD_OK);
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}
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/*
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* Throw away anything we think we know about PnP devices on (list)
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*/
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static void
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pnp_discard(struct pnpinfo **list)
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{
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struct pnpinfo *pi;
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struct pnpident *id;
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while (*list != NULL) {
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pi = *list;
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*list = (*list)->pi_next;
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while (pi->pi_ident) {
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id = pi->pi_ident;
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pi->pi_ident = pi->pi_ident->id_next;
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free(id);
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}
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if (pi->pi_module)
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free(pi->pi_module);
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if (pi->pi_argv)
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free(pi->pi_argv);
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free(pi);
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}
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}
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/*
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* The PnP configuration database consists of a flat text file with
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* entries one per line. Valid lines are:
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*
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* # <text>
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*
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* This line is a comment, and ignored.
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*
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* [<name>]
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*
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* Entries following this line are for devices connected to the
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* bus <name>, At least one such entry must be encountered
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* before identifiers are recognised.
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*
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* ident=<identifier> rev=<revision> module=<module> args=<arguments>
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*
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* This line describes an identifier:module mapping. The 'ident'
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* and 'module' fields are required; the 'rev' field is currently
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* ignored (but should be used), and the 'args' field must come
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* last.
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*
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* Comments may be appended to lines; any character including or following
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* '#' on a line is ignored.
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*/
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static int
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pnp_readconf(char *path)
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{
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struct pnpinfo *pi;
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struct pnpident *id;
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int fd, line;
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char lbuf[128], *currbus, *ident, *revision, *module, *args;
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char *cp, *ep, *tp, c;
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/* try to open the file */
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if ((fd = open(path, O_RDONLY)) >= 0) {
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line = 0;
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currbus = NULL;
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while (fgetstr(lbuf, sizeof(lbuf), fd) > 0) {
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line++;
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/* Find the first non-space character on the line */
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for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
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;
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/* keep/discard? */
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if ((*cp == 0) || (*cp == '#'))
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continue;
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/* cut trailing comment? */
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if ((ep = strchr(cp, '#')) != NULL)
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*ep = 0;
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/* bus declaration? */
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if (*cp == '[') {
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if (((ep = strchr(cp, ']')) == NULL) || ((ep - cp) < 2)) {
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printf("%s line %d: bad bus specification\n", path, line);
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} else {
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if (currbus != NULL)
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free(currbus);
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*ep = 0;
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currbus = strdup(cp + 1);
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}
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continue;
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}
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/* XXX should we complain? */
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if (currbus == NULL)
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continue;
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/* mapping */
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for (ident = module = args = revision = NULL; *cp != 0;) {
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/* discard leading whitespace */
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if (isspace(*cp)) {
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cp++;
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continue;
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}
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/* scan for terminator, separator */
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for (ep = cp; (*ep != 0) && (*ep != '=') && !isspace(*ep); ep++)
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;
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if (*ep == '=') {
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*ep = 0;
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for (tp = ep + 1; (*tp != 0) && !isspace(*tp); tp++)
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;
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c = *tp;
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*tp = 0;
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if ((ident == NULL) && !strcmp(cp, "ident")) {
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ident = ep + 1;
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} else if ((revision == NULL) && !strcmp(cp, "revision")) {
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revision = ep + 1;
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} else if ((args == NULL) && !strcmp(cp, "args")) {
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*tp = c;
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while (*tp != 0) /* skip to end of string */
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tp++;
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args = ep + 1;
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} else {
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/* XXX complain? */
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}
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cp = tp;
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continue;
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}
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/* it's garbage or a keyword - ignore it for now */
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cp = ep;
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}
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/* we must have at least ident and module set to be interesting */
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if ((ident == NULL) || (module == NULL))
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continue;
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/*
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* Loop looking for module/bus that might match this, but aren't already
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* assigned.
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* XXX no revision parse/test here yet.
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*/
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for (pi = pnp_devices; pi != NULL; pi = pi->pi_next) {
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/* no driver assigned, bus matches OK */
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if ((pi->pi_module == NULL) &&
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!strcmp(pi->pi_handler->pp_name, currbus)) {
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/* scan idents, take first match */
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for (id = pi->pi_ident; id != NULL; id = id->id_next)
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if (!strcmp(id->id_ident, ident))
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break;
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/* find a match? */
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if (id != NULL) {
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if (args != NULL)
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if (parse(&pi->pi_argc, &pi->pi_argv, args)) {
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printf("%s line %d: bad arguments\n", path, line);
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continue;
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}
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pi->pi_module = strdup(module);
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printf("use module '%s' for %s:%s\n", module, pi->pi_handler->pp_name, id->id_ident);
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}
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}
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}
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}
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close(fd);
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}
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return(CMD_OK);
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}
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static int
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pnp_scankernel(void)
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{
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return(CMD_OK);
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}
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/*
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* Add a unique identifier to (pi)
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*/
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void
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pnp_addident(struct pnpinfo *pi, char *ident)
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{
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struct pnpident *id, **idp;
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if (pi->pi_ident == NULL) {
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idp = &(pi->pi_ident);
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} else {
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for (id = pi->pi_ident; id->id_next != NULL; id = id->id_next)
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if (!strcmp(id->id_ident, ident))
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return; /* already have this one */
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;
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idp = &(id->id_next);
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}
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*idp = malloc(sizeof(struct pnpident));
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(*idp)->id_next = NULL;
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(*idp)->id_ident = strdup(ident);
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}
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