Release 4.14 arch/x86/boot/cpu.c

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007-2008 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * arch/x86/boot/cpu.c
 *
 * Check for obligatory CPU features and abort if the features are not
 * present.
 */

#include "boot.h"
#ifdef CONFIG_X86_FEATURE_NAMES
#include "cpustr.h"
#endif



static char *cpu_name(int level)
{
	static char buf[6];

	if (level == 64) {
		return "x86-64";
	} else {
		if (level == 15)
			level = 6;
		sprintf(buf, "i%d86", level);
		return buf;
	}
}

Contributors
Person
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Commits
CommitProp
H. Peter Anvin
43
81.13%
1
50.00%
Dave Jones
10
18.87%
1
50.00%
Total
53
100.00%
2
100.00%



static void show_cap_strs(u32 *err_flags)
{
	int i, j;
#ifdef CONFIG_X86_FEATURE_NAMES
	const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs;
	for (i = 0; i < NCAPINTS; i++) {
		u32 e = err_flags[i];
		for (j = 0; j < 32; j++) {
			if (msg_strs[0] < i ||
			    (msg_strs[0] == i && msg_strs[1] < j)) {
				/* Skip to the next string */
				msg_strs += 2;
				while (*msg_strs++)
					;
			}
			if (e & 1) {
				if (msg_strs[0] == i &&
				    msg_strs[1] == j &&
				    msg_strs[2])
					printf("%s ", msg_strs+2);
				else
					printf("%d:%d ", i, j);
			}
			e >>= 1;
		}
	}
#else
	for (i = 0; i < NCAPINTS; i++) {
		u32 e = err_flags[i];
		for (j = 0; j < 32; j++) {
			if (e & 1)
				printf("%d:%d ", i, j);
			e >>= 1;
		}
	}
#endif
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
148
66.67%
3
75.00%
Josh Triplett
74
33.33%
1
25.00%
Total
222
100.00%
4
100.00%



int validate_cpu(void)
{
	u32 *err_flags;
	int cpu_level, req_level;

	check_cpu(&cpu_level, &req_level, &err_flags);

	if (cpu_level < req_level) {
		printf("This kernel requires an %s CPU, ",
		       cpu_name(req_level));
		printf("but only detected an %s CPU.\n",
		       cpu_name(cpu_level));
		return -1;
	}

	if (err_flags) {
		puts("This kernel requires the following features "
		     "not present on the CPU:\n");
		show_cap_strs(err_flags);
		putchar('\n');
		return -1;
	} else if (check_knl_erratum()) {
		return -1;
	} else {
		return 0;
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Josh Triplett
75
72.12%
1
33.33%
H. Peter Anvin
17
16.35%
1
33.33%
Dave Hansen
12
11.54%
1
33.33%
Total
104
100.00%
3
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
H. Peter Anvin
216
55.10%
3
50.00%
Josh Triplett
154
39.29%
1
16.67%
Dave Hansen
12
3.06%
1
16.67%
Dave Jones
10
2.55%
1
16.67%
Total
392
100.00%
6
100.00%
Directory: arch/x86/boot

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