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Merge branch 'x86-microcode-for-linus' of git://git.kernel.org/pub/sc…
…m/linux/kernel/git/tip/tip into next Pull x86 microcode changes from Ingo Molnar: "A microcode-debugging boot flag plus related refactoring" * 'x86-microcode-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86, microcode: Add a disable chicken bit x86, boot: Carve out early cmdline parsing function
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#ifndef _ASM_X86_CMDLINE_H | ||
#define _ASM_X86_CMDLINE_H | ||
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int cmdline_find_option_bool(const char *cmdline_ptr, const char *option); | ||
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#endif /* _ASM_X86_CMDLINE_H */ |
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/* | ||
* This file is part of the Linux kernel, and is made available under | ||
* the terms of the GNU General Public License version 2. | ||
* | ||
* Misc librarized functions for cmdline poking. | ||
*/ | ||
#include <linux/kernel.h> | ||
#include <linux/string.h> | ||
#include <linux/ctype.h> | ||
#include <asm/setup.h> | ||
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static inline int myisspace(u8 c) | ||
{ | ||
return c <= ' '; /* Close enough approximation */ | ||
} | ||
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/** | ||
* Find a boolean option (like quiet,noapic,nosmp....) | ||
* | ||
* @cmdline: the cmdline string | ||
* @option: option string to look for | ||
* | ||
* Returns the position of that @option (starts counting with 1) | ||
* or 0 on not found. | ||
*/ | ||
int cmdline_find_option_bool(const char *cmdline, const char *option) | ||
{ | ||
char c; | ||
int len, pos = 0, wstart = 0; | ||
const char *opptr = NULL; | ||
enum { | ||
st_wordstart = 0, /* Start of word/after whitespace */ | ||
st_wordcmp, /* Comparing this word */ | ||
st_wordskip, /* Miscompare, skip */ | ||
} state = st_wordstart; | ||
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if (!cmdline) | ||
return -1; /* No command line */ | ||
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len = min_t(int, strlen(cmdline), COMMAND_LINE_SIZE); | ||
if (!len) | ||
return 0; | ||
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while (len--) { | ||
c = *(char *)cmdline++; | ||
pos++; | ||
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switch (state) { | ||
case st_wordstart: | ||
if (!c) | ||
return 0; | ||
else if (myisspace(c)) | ||
break; | ||
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state = st_wordcmp; | ||
opptr = option; | ||
wstart = pos; | ||
/* fall through */ | ||
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case st_wordcmp: | ||
if (!*opptr) | ||
if (!c || myisspace(c)) | ||
return wstart; | ||
else | ||
state = st_wordskip; | ||
else if (!c) | ||
return 0; | ||
else if (c != *opptr++) | ||
state = st_wordskip; | ||
else if (!len) /* last word and is matching */ | ||
return wstart; | ||
break; | ||
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case st_wordskip: | ||
if (!c) | ||
return 0; | ||
else if (myisspace(c)) | ||
state = st_wordstart; | ||
break; | ||
} | ||
} | ||
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return 0; /* Buffer overrun */ | ||
} |