alternative.c

  1// SPDX-License-Identifier: GPL-2.0
  2#define boot_fmt(fmt)	"alt: " fmt
  3#include "boot.h"
  4
  5#define a_debug		boot_debug
  6
  7#include "../kernel/alternative.c"
  8
  9static void alt_debug_all(int type)
 10{
 11	int i;
 12
 13	switch (type) {
 14	case ALT_TYPE_FACILITY:
 15		for (i = 0; i < ARRAY_SIZE(alt_debug.facilities); i++)
 16			alt_debug.facilities[i] = -1UL;
 17		break;
 18	case ALT_TYPE_FEATURE:
 19		for (i = 0; i < ARRAY_SIZE(alt_debug.mfeatures); i++)
 20			alt_debug.mfeatures[i] = -1UL;
 21		break;
 22	case ALT_TYPE_SPEC:
 23		alt_debug.spec = 1;
 24		break;
 25	}
 26}
 27
 28static void alt_debug_modify(int type, unsigned int nr, bool clear)
 29{
 30	switch (type) {
 31	case ALT_TYPE_FACILITY:
 32		if (clear)
 33			__clear_facility(nr, alt_debug.facilities);
 34		else
 35			__set_facility(nr, alt_debug.facilities);
 36		break;
 37	case ALT_TYPE_FEATURE:
 38		if (clear)
 39			__clear_machine_feature(nr, alt_debug.mfeatures);
 40		else
 41			__set_machine_feature(nr, alt_debug.mfeatures);
 42		break;
 43	}
 44}
 45
 46static char *alt_debug_parse(int type, char *str)
 47{
 48	unsigned long val, endval;
 49	char *endp;
 50	bool clear;
 51	int i;
 52
 53	if (*str == ':') {
 54		str++;
 55	} else {
 56		alt_debug_all(type);
 57		return str;
 58	}
 59	clear = false;
 60	if (*str == '!') {
 61		alt_debug_all(type);
 62		clear = true;
 63		str++;
 64	}
 65	while (*str) {
 66		val = simple_strtoull(str, &endp, 0);
 67		if (str == endp)
 68			break;
 69		str = endp;
 70		if (*str == '-') {
 71			str++;
 72			endval = simple_strtoull(str, &endp, 0);
 73			if (str == endp)
 74				break;
 75			str = endp;
 76			while (val <= endval) {
 77				alt_debug_modify(type, val, clear);
 78				val++;
 79			}
 80		} else {
 81			alt_debug_modify(type, val, clear);
 82		}
 83		if (*str != ',')
 84			break;
 85		str++;
 86	}
 87	return str;
 88}
 89
 90/*
 91 * Use debug-alternative command line parameter for debugging:
 92 * "debug-alternative"
 93 *  -> print debug message for every single alternative
 94 *
 95 * "debug-alternative=0;2"
 96 * -> print debug message for all alternatives with type 0 and 2
 97 *
 98 * "debug-alternative=0:0-7"
 99 * -> print debug message for all alternatives with type 0 and with
100 *    facility numbers within the range of 0-7
101 *    (if type 0 is ALT_TYPE_FACILITY)
102 *
103 * "debug-alternative=0:!8;1"
104 * -> print debug message for all alternatives with type 0, for all
105 *    facility number, except facility 8, and in addition print all
106 *    alternatives with type 1
107 */
108void alt_debug_setup(char *str)
109{
110	unsigned long type;
111	char *endp;
112	int i;
113
114	if (!str) {
115		alt_debug_all(ALT_TYPE_FACILITY);
116		alt_debug_all(ALT_TYPE_FEATURE);
117		alt_debug_all(ALT_TYPE_SPEC);
118		return;
119	}
120	while (*str) {
121		type = simple_strtoull(str, &endp, 0);
122		if (str == endp)
123			break;
124		str = endp;
125		switch (type) {
126		case ALT_TYPE_FACILITY:
127		case ALT_TYPE_FEATURE:
128			str = alt_debug_parse(type, str);
129			break;
130		case ALT_TYPE_SPEC:
131			alt_debug_all(ALT_TYPE_SPEC);
132			break;
133		}
134		if (*str != ';')
135			break;
136		str++;
137	}
138}