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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/s390/boot/alternative.c
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// SPDX-License-Identifier: GPL-2.0

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#define boot_fmt(fmt)	"alt: " fmt

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#include "boot.h"

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#define a_debug		boot_debug

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#include "../kernel/alternative.c"

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static void alt_debug_all(int type)

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{

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	int i;

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	switch (type) {

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	case ALT_TYPE_FACILITY:

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		for (i = 0; i < ARRAY_SIZE(alt_debug.facilities); i++)

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			alt_debug.facilities[i] = -1UL;

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		break;

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	case ALT_TYPE_FEATURE:

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		for (i = 0; i < ARRAY_SIZE(alt_debug.mfeatures); i++)

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			alt_debug.mfeatures[i] = -1UL;

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		break;

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	case ALT_TYPE_SPEC:

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		alt_debug.spec = 1;

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		break;

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	}

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}

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static void alt_debug_modify(int type, unsigned int nr, bool clear)

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{

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	switch (type) {

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	case ALT_TYPE_FACILITY:

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		if (clear)

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			__clear_facility(nr, alt_debug.facilities);

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		else

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			__set_facility(nr, alt_debug.facilities);

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		break;

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	case ALT_TYPE_FEATURE:

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		if (clear)

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			__clear_machine_feature(nr, alt_debug.mfeatures);

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		else

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			__set_machine_feature(nr, alt_debug.mfeatures);

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		break;

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	}

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}

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static char *alt_debug_parse(int type, char *str)

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{

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	unsigned long val, endval;

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	char *endp;

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	bool clear;

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	int i;

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	if (*str == ':') {

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		str++;

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	} else {

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		alt_debug_all(type);

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		return str;

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	}

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	clear = false;

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	if (*str == '!') {

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		alt_debug_all(type);

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		clear = true;

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		str++;

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	}

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	while (*str) {

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		val = simple_strtoull(str, &endp, 0);

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		if (str == endp)

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			break;

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		str = endp;

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		if (*str == '-') {

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			str++;

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			endval = simple_strtoull(str, &endp, 0);

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			if (str == endp)

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				break;

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			str = endp;

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			while (val <= endval) {

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				alt_debug_modify(type, val, clear);

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				val++;

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			}

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		} else {

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			alt_debug_modify(type, val, clear);

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		}

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		if (*str != ',')

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			break;

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		str++;

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	}

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	return str;

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}

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/*

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 * Use debug-alternative command line parameter for debugging:

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 * "debug-alternative"

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 *  -> print debug message for every single alternative

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 *

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 * "debug-alternative=0;2"

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 * -> print debug message for all alternatives with type 0 and 2

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 *

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 * "debug-alternative=0:0-7"

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 * -> print debug message for all alternatives with type 0 and with

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 *    facility numbers within the range of 0-7

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 *    (if type 0 is ALT_TYPE_FACILITY)

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 *

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 * "debug-alternative=0:!8;1"

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 * -> print debug message for all alternatives with type 0, for all

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 *    facility number, except facility 8, and in addition print all

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 *    alternatives with type 1

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 */

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void alt_debug_setup(char *str)

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{

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	unsigned long type;

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	char *endp;

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	int i;

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	if (!str) {

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		alt_debug_all(ALT_TYPE_FACILITY);

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		alt_debug_all(ALT_TYPE_FEATURE);

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		alt_debug_all(ALT_TYPE_SPEC);

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		return;

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	}

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	while (*str) {

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		type = simple_strtoull(str, &endp, 0);

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		if (str == endp)

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			break;

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		str = endp;

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		switch (type) {

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		case ALT_TYPE_FACILITY:

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		case ALT_TYPE_FEATURE:

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			str = alt_debug_parse(type, str);

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			break;

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		case ALT_TYPE_SPEC:

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			alt_debug_all(ALT_TYPE_SPEC);

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			break;

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		}

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		if (*str != ';')

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			break;

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		str++;

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	}

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}

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