Go back to having either static OR dynamic hints, with fallback

support.  Trying to fix the merged set where dynamic overrode
static was getting more and more complicated by the day.

This should fix the duplicate atkbd, psm, fd* etc in GENERIC.  (which
paniced the alpha, but not the i386)

sys/kern/subr_bus.c

@@ -91,8 +91,6 @@ void print_devclass_list(void);
 #define print_devclass_list()		/* nop */
 #endif
 
-extern char static_hints[];		/* by config for now */
-
 TAILQ_HEAD(,device)	bus_data_devices;
 static int bus_data_generation = 1;
 
@@ -2134,13 +2132,17 @@ bus_data_generation_update(void)
  * Access functions for device resources.
  */
 
+extern char static_hints[];		/* by config for now */
+extern int hintmode;			/* 0 = off. 1 = config, 2 = fallback */
+static char *hintp;
+
 /*
  * Evil wildcarding resource string lookup.
  * This walks the supplied env string table and returns a match.
  * The start point can be remembered for incremental searches.
  */
 static int
-res_find(const char *cp, int *line, int *startln,
+res_find(int *line, int *startln,
     const char *name, int *unit, const char *resname, const char *value,
     const char **ret_name, int *ret_namelen, int *ret_unit,
     const char **ret_resname, int *ret_resnamelen, const char **ret_value)
@@ -2150,9 +2152,43 @@ res_find(const char *cp, int *line, int *startln,
 	int r_unit;
 	char r_resname[32];
 	char r_value[128];
-	const char *s;
+	const char *s, *cp;
 	char *p;
 
+	if (hintp == NULL) {
+		switch (hintmode) {
+		case 0:		/* config supplied nothing */
+			hintp = kern_envp;
+			break;
+		case 1:		/* static hints only */
+			hintp = static_hints;
+			break;
+		case 2:		/* fallback mode */
+			cp = kern_envp;
+			while (cp) {
+				if (strncmp(cp, "hint.", 5) == 0) {
+					cp = NULL;
+					hintp = kern_envp;
+					break;
+				}
+				while (*cp != '\0')
+					cp++;
+				cp++;
+				if (*cp == '\0') {
+					cp = NULL;
+					hintp = static_hints;
+					break;
+				}
+			}
+			break;
+		default:
+			break;
+		}
+		if (hintp == NULL)
+			hintp = kern_envp;
+	}
+
+	cp = hintp;
 	while (cp) {
 		hit = 1;
 		(*line)++;
@@ -2231,12 +2267,7 @@ resource_find(int *line, int *startln,
 	*line = 0;
 
 	/* Search for exact unit matches first */
-	i = res_find(kern_envp, line, startln, name, unit, resname, value,
-	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
-	    ret_value);
-	if (i == 0)
-		return 0;
-	i = res_find(static_hints, line, startln, name, unit, resname, value,
+	i = res_find(line, startln, name, unit, resname, value,
 	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
 	    ret_value);
 	if (i == 0)
@@ -2245,13 +2276,7 @@ resource_find(int *line, int *startln,
 		return ENOENT;
 	/* If we are still here, search for wildcard matches */
 	un = -1;
-	i = res_find(kern_envp, line, startln, name, &un, resname, value,
-	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
-	    ret_value);
-	if (i == 0)
-		return 0;
-	un = -1;
-	i = res_find(static_hints, line, startln, name, &un, resname, value,
+	i = res_find(line, startln, name, &un, resname, value,
 	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
 	    ret_value);
 	if (i == 0)

sys/kern/subr_hints.c

@@ -35,6 +35,8 @@
  */
 
 extern char static_hints[];		/* by config for now */
+extern int hintmode;			/* 0 = off. 1 = config, 2 = fallback */
+static char *hintp;
 
 /*
  * Evil wildcarding resource string lookup.
@@ -42,7 +44,7 @@ extern char static_hints[];		/* by config for now */
  * The start point can be remembered for incremental searches.
  */
 static int
-res_find(const char *cp, int *line, int *startln,
+res_find(int *line, int *startln,
     const char *name, int *unit, const char *resname, const char *value,
     const char **ret_name, int *ret_namelen, int *ret_unit,
     const char **ret_resname, int *ret_resnamelen, const char **ret_value)
@@ -52,9 +54,43 @@ res_find(const char *cp, int *line, int *startln,
 	int r_unit;
 	char r_resname[32];
 	char r_value[128];
-	const char *s;
+	const char *s, *cp;
 	char *p;
 
+	if (hintp == NULL) {
+		switch (hintmode) {
+		case 0:		/* config supplied nothing */
+			hintp = kern_envp;
+			break;
+		case 1:		/* static hints only */
+			hintp = static_hints;
+			break;
+		case 2:		/* fallback mode */
+			cp = kern_envp;
+			while (cp) {
+				if (strncmp(cp, "hint.", 5) == 0) {
+					cp = NULL;
+					hintp = kern_envp;
+					break;
+				}
+				while (*cp != '\0')
+					cp++;
+				cp++;
+				if (*cp == '\0') {
+					cp = NULL;
+					hintp = static_hints;
+					break;
+				}
+			}
+			break;
+		default:
+			break;
+		}
+		if (hintp == NULL)
+			hintp = kern_envp;
+	}
+
+	cp = hintp;
 	while (cp) {
 		hit = 1;
 		(*line)++;
@@ -133,12 +169,7 @@ resource_find(int *line, int *startln,
 	*line = 0;
 
 	/* Search for exact unit matches first */
-	i = res_find(kern_envp, line, startln, name, unit, resname, value,
-	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
-	    ret_value);
-	if (i == 0)
-		return 0;
-	i = res_find(static_hints, line, startln, name, unit, resname, value,
+	i = res_find(line, startln, name, unit, resname, value,
 	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
 	    ret_value);
 	if (i == 0)
@@ -147,13 +178,7 @@ resource_find(int *line, int *startln,
 		return ENOENT;
 	/* If we are still here, search for wildcard matches */
 	un = -1;
-	i = res_find(kern_envp, line, startln, name, &un, resname, value,
-	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
-	    ret_value);
-	if (i == 0)
-		return 0;
-	un = -1;
-	i = res_find(static_hints, line, startln, name, &un, resname, value,
+	i = res_find(line, startln, name, &un, resname, value,
 	    ret_name, ret_namelen, ret_unit, ret_resname, ret_resnamelen,
 	    ret_value);
 	if (i == 0)