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      1 /* $NetBSD: overlay.c,v 1.1 2020/06/26 03:23:04 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2020 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jared McNeill <jmcneill (at) invisible.ca> and Jason R. Thorpe.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "efiboot.h"
     33 #include "overlay.h"
     34 
     35 #include <sys/queue.h>
     36 
     37 int	dtoverlay_enabled = 1;
     38 
     39 struct dtoverlay_entry {
     40 	TAILQ_ENTRY(dtoverlay_entry) entries;
     41 	char overlay_path[];
     42 };
     43 TAILQ_HEAD(, dtoverlay_entry) dtoverlay_entries =
     44     TAILQ_HEAD_INITIALIZER(dtoverlay_entries);
     45 
     46 #define	DTOVERLAY_ENTRY_SIZE(p)	(sizeof(struct dtoverlay_entry) + strlen(p) + 1)
     47 
     48 void
     49 dtoverlay_foreach(void (*fn)(const char *))
     50 {
     51 	struct dtoverlay_entry *d;
     52 
     53 	TAILQ_FOREACH(d, &dtoverlay_entries, entries) {
     54 		fn(d->overlay_path);
     55 	}
     56 }
     57 
     58 void
     59 dtoverlay_add(const char *overlay_path)
     60 {
     61 	struct dtoverlay_entry *d;
     62 
     63 	/* Trim leading whitespace */
     64 	while (*overlay_path == ' ' || *overlay_path == '\t')
     65 		++overlay_path;
     66 
     67 	/* Duplicate check */
     68 	TAILQ_FOREACH(d, &dtoverlay_entries, entries) {
     69 		if (strcmp(d->overlay_path, overlay_path) == 0)
     70 			return;
     71 	}
     72 
     73 	/* Add to list of overlays. */
     74 	d = alloc(DTOVERLAY_ENTRY_SIZE(overlay_path));
     75 	strcpy(d->overlay_path, overlay_path);
     76 	TAILQ_INSERT_TAIL(&dtoverlay_entries, d, entries);
     77 }
     78 
     79 #if 0
     80 void
     81 dtoverlay_remove(const char *overlay_path)
     82 {
     83 	struct dtoverlay_entry *d;
     84 
     85 	/* Trim leading whitespace */
     86 	while (*overlay_path == ' ' || *overlay_path == '\t')
     87 		++overlay_path;
     88 
     89 	TAILQ_FOREACH(d, &dtoverlay_entries, entries) {
     90 		if (strcmp(d->overlay_path, overlay_path) == 0) {
     91 			TAILQ_REMOVE(&dtoverlay_entries, d, entries);
     92 			dealloc(d, DTOVERLAY_ENTRY_SIZE(d->overlay_path));
     93 			return;
     94 		}
     95 	}
     96 }
     97 #endif
     98 
     99 void
    100 dtoverlay_remove_all(void)
    101 {
    102 	struct dtoverlay_entry *d;
    103 
    104 	while ((d = TAILQ_FIRST(&dtoverlay_entries)) != NULL) {
    105 		TAILQ_REMOVE(&dtoverlay_entries, d, entries);
    106 		dealloc(d, DTOVERLAY_ENTRY_SIZE(d->overlay_path));
    107 	}
    108 }
    109 
    110 void
    111 dtoverlay_enable(int onoff)
    112 {
    113 	dtoverlay_enabled = onoff;
    114 }
    115