100 lines
2.0 KiB
C
100 lines
2.0 KiB
C
extern inline unsigned char get_fs_byte(const char * addr)
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{
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unsigned register char _v;
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__asm__ ("movb %%fs:%1,%0":"=q" (_v):"m" (*addr));
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return _v;
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}
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extern inline unsigned short get_fs_word(const unsigned short *addr)
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{
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unsigned short _v;
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__asm__ ("movw %%fs:%1,%0":"=r" (_v):"m" (*addr));
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return _v;
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}
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extern inline unsigned long get_fs_long(const unsigned long *addr)
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{
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unsigned long _v;
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__asm__ ("movl %%fs:%1,%0":"=r" (_v):"m" (*addr)); \
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return _v;
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}
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extern inline void put_fs_byte(char val,char *addr)
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{
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__asm__ ("movb %0,%%fs:%1"::"q" (val),"m" (*addr));
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}
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extern inline void put_fs_word(short val,short * addr)
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{
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__asm__ ("movw %0,%%fs:%1"::"r" (val),"m" (*addr));
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}
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extern inline void put_fs_long(unsigned long val,unsigned long * addr)
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{
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__asm__ ("movl %0,%%fs:%1"::"r" (val),"m" (*addr));
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}
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extern inline void memcpy_tofs(void * to, const void * from, unsigned long n)
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{
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__asm__("cld\n\t"
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"push %%es\n\t"
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"push %%fs\n\t"
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"pop %%es\n\t"
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"testb $1,%%cl\n\t"
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"je 1f\n\t"
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"movsb\n"
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"1:\ttestb $2,%%cl\n\t"
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"je 2f\n\t"
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"movsw\n"
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"2:\tshrl $2,%%ecx\n\t"
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"rep ; movsl\n\t"
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"pop %%es"
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::"c" (n),"D" ((long) to),"S" ((long) from)
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:"cx","di","si");
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}
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extern inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
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{
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__asm__("cld\n\t"
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"testb $1,%%cl\n\t"
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"je 1f\n\t"
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"fs ; movsb\n"
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"1:\ttestb $2,%%cl\n\t"
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"je 2f\n\t"
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"fs ; movsw\n"
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"2:\tshrl $2,%%ecx\n\t"
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"rep ; fs ; movsl"
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::"c" (n),"D" ((long) to),"S" ((long) from)
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:"cx","di","si");
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}
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/*
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* Someone who knows GNU asm better than I should double check the followig.
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* It seems to work, but I don't know if I'm doing something subtly wrong.
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* --- TYT, 11/24/91
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* [ nothing wrong here, Linus: I just changed the ax to be any reg ]
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*/
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extern inline unsigned long get_fs()
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{
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unsigned short _v;
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__asm__("mov %%fs,%0":"=r" (_v):);
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return _v;
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}
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extern inline unsigned long get_ds()
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{
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unsigned short _v;
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__asm__("mov %%ds,%0":"=r" (_v):);
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return _v;
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}
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extern inline void set_fs(unsigned long val)
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{
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__asm__ __volatile__("mov %0,%%fs"::"r" ((unsigned short) val));
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}
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