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      1 /* $NetBSD: devpath.h,v 1.3 2025/03/02 00:03:41 riastradh Exp $ */
      2 
      3 /*
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
     14  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     19  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     23  * SUCH DAMAGE.
     24  */
     25 
     26 #ifndef _DEVPATH_H_
     27 #define _DEVPATH_H_
     28 
     29 #ifndef lint
     30 __RCSID("$NetBSD: devpath.h,v 1.3 2025/03/02 00:03:41 riastradh Exp $");
     31 #endif /* not lint */
     32 
     33 #include <stdlib.h>
     34 #include <util.h>
     35 
     36 typedef struct EFI_DEVICE_PATH_PROTOCOL {
     37 	uint8_t Type;
     38 	uint8_t SubType;
     39 //	uint8_t Length[2];
     40 	uint16_t Length;
     41 //	uint8_t	Data[];
     42 } EFI_DEVICE_PATH_PROTOCOL;
     43 
     44 typedef EFI_DEVICE_PATH_PROTOCOL devpath_t;
     45 
     46 typedef struct devpath_elm {
     47 	size_t sz;
     48 	char *cp;
     49 } devpath_elm_t;
     50 
     51 enum {
     52 	DEVPATH_TYPE_HW    = 1,
     53 	DEVPATH_TYPE_ACPI  = 2,
     54 	DEVPATH_TYPE_MSG   = 3,
     55 	DEVPATH_TYPE_MEDIA = 4,
     56 	DEVPATH_TYPE_BIOS  = 5,
     57 	DEVPATH_TYPE_END   = 0x7f,
     58 };
     59 
     60 #define DEVPATH_END_ALL \
     61   ((EFI_DEVICE_PATH_PROTOCOL){.Type = 0x7f, .SubType = 0xff, .Length = 0x04})
     62 #define DEVPATH_END_SEG \
     63   ((EFI_DEVICE_PATH_PROTOCOL){.Type = 0x7f, .SubType = 0x01, .Length = 0x04})
     64 
     65 /*
     66  * For debugging
     67  */
     68 #define DEVPATH_FMT_HDR	"  DevPath_Hdr: Type %u, SubType: %u, Length: %u\n"
     69 #define DEVPATH_FMT_PFX	"    "
     70 #define DEVPATH_FMT(s)	DEVPATH_FMT_PFX #s
     71 #define DEVPATH_DAT_HDR(dp)	(dp)->Type, (dp)->SubType, (dp)->Length
     72 
     73 static inline char *
     74 aconcat(char *bp1, const char *sep, char *bp2)
     75 {
     76 	char *bp;
     77 
     78 	easprintf(&bp, "%s%s%s", bp1, sep, bp2);
     79 	free(bp1);
     80 	free(bp2);
     81 	return bp;
     82 }
     83 
     84 static inline const char *
     85 devpath_type_name(size_t type)
     86 {
     87 	static const char *type_tbl[] = {
     88 		[DEVPATH_TYPE_HW]    = "HW",
     89 		[DEVPATH_TYPE_ACPI]  = "ACPI",
     90 		[DEVPATH_TYPE_MSG]   = "MSG",
     91 		[DEVPATH_TYPE_MEDIA] = "MEDIA",
     92 		[DEVPATH_TYPE_BIOS]  = "BIOS",
     93 	};
     94 
     95 	if (type == DEVPATH_TYPE_END)
     96 		return "END";
     97 
     98 	if (type > __arraycount(type_tbl) || type == 0)
     99 		return "UNKNOWN";
    100 
    101 	return type_tbl[type];
    102 
    103 }
    104 
    105 static inline void
    106 devpath_hdr(devpath_t *dp, devpath_elm_t *elm)
    107 {
    108 
    109 	elm->sz = (size_t)easprintf(&elm->cp,
    110 	    DEVPATH_FMT_HDR, DEVPATH_DAT_HDR(dp));
    111 }
    112 
    113 static inline void
    114 devpath_unsupported(devpath_t *dp, devpath_elm_t *path, devpath_elm_t *dbg)
    115 {
    116 
    117 	path->sz = (size_t)easprintf(&path->cp,
    118 	    "[unsupported devpath type: %s(%u), subtype: %u]",
    119 	    devpath_type_name(dp->Type), dp->Type, dp->SubType);
    120 
    121 	if (dbg != NULL)
    122 		devpath_hdr(dp, dbg);
    123 }
    124 
    125 char *devpath_parse(devpath_t *, size_t, char **);
    126 
    127 #endif /* _DEVPATH_H_ */
    128