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Commit 9447dc43 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86/boot' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 boot changes from Peter Anvin:
 "This patchset is a set of cleanups aiming at librarize some of the
  common code from the boot environments.  We currently have three
  different "little environments" (boot, boot/compressed, and
  realmode/rm) in x86, and we are likely to soon get a fourth one
  (kexec/purgatory, which will have to be integrated in the kernel to
  support secure kexec).  This is primarily a cleanup in the
  anticipation of the latter.

  While Vivek implemented this, he ran into some bugs, in particular the
  memcmp implementation for when gcc punts from using the builtin would
  have a misnamed symbol, causing compilation errors if we were ever
  unlucky enough that gcc didn't want to inline the test"

* 'x86/boot' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86, boot: Move memset() definition in compressed/string.c
  x86, boot: Move memcmp() into string.h and string.c
  x86, boot: Move optimized memcpy() 32/64 bit versions to compressed/string.c
  x86, boot: Create a separate string.h file to provide standard string functions
  x86, boot: Undef memcmp before providing a new definition
parents bb1775c9 04999550

arch/x86/boot/boot.h

+0 −13
Original line number Diff line number Diff line
@@ -177,14 +177,6 @@ static inline void wrgs32(u32 v, addr_t addr) 
}



/* Note: these only return true/false, not a signed return value! */

static inline int memcmp(const void *s1, const void *s2, size_t len)

{

	u8 diff;

	asm("repe; cmpsb; setnz %0"

	    : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));

	return diff;

}



static inline int memcmp_fs(const void *s1, addr_t s2, size_t len)

{

	u8 diff;
@@ -228,11 +220,6 @@ void copy_to_fs(addr_t dst, void *src, size_t len); 
void *copy_from_fs(void *dst, addr_t src, size_t len);

void copy_to_gs(addr_t dst, void *src, size_t len);

void *copy_from_gs(void *dst, addr_t src, size_t len);

void *memcpy(void *dst, void *src, size_t len);

void *memset(void *dst, int c, size_t len);



#define memcpy(d,s,l) __builtin_memcpy(d,s,l)

#define memset(d,c,l) __builtin_memset(d,c,l)



/* a20.c */

int enable_a20(void);

arch/x86/boot/compressed/misc.c

+8 −43
Original line number Diff line number Diff line
@@ -10,6 +10,7 @@ 
 */



#include "misc.h"

#include "../string.h"



/* WARNING!!

 * This code is compiled with -fPIC and it is relocated dynamically
@@ -97,8 +98,14 @@ 
 */

#define STATIC		static



#undef memset

#undef memcpy



/*

 * Use a normal definition of memset() from string.c. There are already

 * included header files which expect a definition of memset() and by

 * the time we define memset macro, it is too late.

 */

#undef memset

#define memzero(s, n)	memset((s), 0, (n))
@@ -109,9 +116,6 @@ static void error(char *m); 
 */

struct boot_params *real_mode;		/* Pointer to real-mode data */



void *memset(void *s, int c, size_t n);

void *memcpy(void *dest, const void *src, size_t n);



memptr free_mem_ptr;

memptr free_mem_end_ptr;
@@ -216,45 +220,6 @@ void __putstr(const char *s) 
	outb(0xff & (pos >> 1), vidport+1);

}



void *memset(void *s, int c, size_t n)

{

	int i;

	char *ss = s;



	for (i = 0; i < n; i++)

		ss[i] = c;

	return s;

}

#ifdef CONFIG_X86_32

void *memcpy(void *dest, const void *src, size_t n)

{

	int d0, d1, d2;

	asm volatile(

		"rep ; movsl\n\t"

		"movl %4,%%ecx\n\t"

		"rep ; movsb\n\t"

		: "=&c" (d0), "=&D" (d1), "=&S" (d2)

		: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)

		: "memory");



	return dest;

}

#else

void *memcpy(void *dest, const void *src, size_t n)

{

	long d0, d1, d2;

	asm volatile(

		"rep ; movsq\n\t"

		"movq %4,%%rcx\n\t"

		"rep ; movsb\n\t"

		: "=&c" (d0), "=&D" (d1), "=&S" (d2)

		: "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)

		: "memory");



	return dest;

}

#endif



static void error(char *x)

{

	error_putstr("\n\n");

arch/x86/boot/compressed/string.c

+40 −6
Original line number Diff line number Diff line 
#include "misc.h"

#include "../string.c"



/* misc.h might pull in string_32.h which has a macro for memcpy. undef that */

#undef memcpy



int memcmp(const void *s1, const void *s2, size_t len)

#ifdef CONFIG_X86_32

void *memcpy(void *dest, const void *src, size_t n)

{

	u8 diff;

	asm("repe; cmpsb; setnz %0"

	    : "=qm" (diff), "+D" (s1), "+S" (s2), "+c" (len));

	return diff;

	int d0, d1, d2;

	asm volatile(

		"rep ; movsl\n\t"

		"movl %4,%%ecx\n\t"

		"rep ; movsb\n\t"

		: "=&c" (d0), "=&D" (d1), "=&S" (d2)

		: "0" (n >> 2), "g" (n & 3), "1" (dest), "2" (src)

		: "memory");



	return dest;

}

#else

void *memcpy(void *dest, const void *src, size_t n)

{

	long d0, d1, d2;

	asm volatile(

		"rep ; movsq\n\t"

		"movq %4,%%rcx\n\t"

		"rep ; movsb\n\t"

		: "=&c" (d0), "=&D" (d1), "=&S" (d2)

		: "0" (n >> 3), "g" (n & 7), "1" (dest), "2" (src)

		: "memory");



#include "../string.c"
 
	return dest;

}

#endif



void *memset(void *s, int c, size_t n)

{

	int i;

	char *ss = s;



	for (i = 0; i < n; i++)

		ss[i] = c;

	return s;

}

arch/x86/boot/cpucheck.c

+1 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <asm/processor-flags.h>

#include <asm/required-features.h>

#include <asm/msr-index.h>

#include "string.h"



static u32 err_flags[NCAPINTS];

arch/x86/boot/edd.c

+1 −0
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 


#include "boot.h"

#include <linux/edd.h>

#include "string.h"



#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)