Messages in this thread Patch in this message | | | Date | Sat, 20 Oct 2007 07:51:29 -0400 | From | Chris Snook <> | Subject | [PATCH] x86: unify div64{,_32,_64}.h |
| |
From: Chris Snook <csnook@redhat.com>
Unify x86 div64.h headers.
Signed-off-by: Chris Snook <csnook@redhat.com>
diff -Nurp a/include/asm-x86/div64_32.h b/include/asm-x86/div64_32.h --- a/include/asm-x86/div64_32.h 2007-10-20 07:33:53.000000000 -0400 +++ b/include/asm-x86/div64_32.h 1969-12-31 19:00:00.000000000 -0500 @@ -1,52 +0,0 @@ -#ifndef __I386_DIV64 -#define __I386_DIV64 - -#include <linux/types.h> - -/* - * do_div() is NOT a C function. It wants to return - * two values (the quotient and the remainder), but - * since that doesn't work very well in C, what it - * does is: - * - * - modifies the 64-bit dividend _in_place_ - * - returns the 32-bit remainder - * - * This ends up being the most efficient "calling - * convention" on x86. - */ -#define do_div(n,base) ({ \ - unsigned long __upper, __low, __high, __mod, __base; \ - __base = (base); \ - asm("":"=a" (__low), "=d" (__high):"A" (n)); \ - __upper = __high; \ - if (__high) { \ - __upper = __high % (__base); \ - __high = __high / (__base); \ - } \ - asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (__base), "0" (__low), "1" (__upper)); \ - asm("":"=A" (n):"a" (__low),"d" (__high)); \ - __mod; \ -}) - -/* - * (long)X = ((long long)divs) / (long)div - * (long)rem = ((long long)divs) % (long)div - * - * Warning, this will do an exception if X overflows. - */ -#define div_long_long_rem(a,b,c) div_ll_X_l_rem(a,b,c) - -static inline long -div_ll_X_l_rem(long long divs, long div, long *rem) -{ - long dum2; - __asm__("divl %2":"=a"(dum2), "=d"(*rem) - : "rm"(div), "A"(divs)); - - return dum2; - -} - -extern uint64_t div64_64(uint64_t dividend, uint64_t divisor); -#endif diff -Nurp a/include/asm-x86/div64_64.h b/include/asm-x86/div64_64.h --- a/include/asm-x86/div64_64.h 2007-10-20 07:33:53.000000000 -0400 +++ b/include/asm-x86/div64_64.h 1969-12-31 19:00:00.000000000 -0500 @@ -1 +0,0 @@ -#include <asm-generic/div64.h> diff -Nurp a/include/asm-x86/div64.h b/include/asm-x86/div64.h --- a/include/asm-x86/div64.h 2007-10-20 07:33:53.000000000 -0400 +++ b/include/asm-x86/div64.h 2007-10-20 07:32:34.000000000 -0400 @@ -1,5 +1,58 @@ +#ifndef _ASM_X86_DIV64_H +#define _ASM_X86_DIV64_H + #ifdef CONFIG_X86_32 -# include "div64_32.h" -#else -# include "div64_64.h" -#endif + +#include <linux/types.h> + +/* + * do_div() is NOT a C function. It wants to return + * two values (the quotient and the remainder), but + * since that doesn't work very well in C, what it + * does is: + * + * - modifies the 64-bit dividend _in_place_ + * - returns the 32-bit remainder + * + * This ends up being the most efficient "calling + * convention" on x86. + */ +#define do_div(n,base) ({ \ + unsigned long __upper, __low, __high, __mod, __base; \ + __base = (base); \ + asm("":"=a" (__low), "=d" (__high):"A" (n)); \ + __upper = __high; \ + if (__high) { \ + __upper = __high % (__base); \ + __high = __high / (__base); \ + } \ + asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (__base), "0" (__low), "1" (__upper)); \ + asm("":"=A" (n):"a" (__low),"d" (__high)); \ + __mod; \ +}) + +/* + * (long)X = ((long long)divs) / (long)div + * (long)rem = ((long long)divs) % (long)div + * + * Warning, this will do an exception if X overflows. + */ +#define div_long_long_rem(a,b,c) div_ll_X_l_rem(a,b,c) + +static inline long +div_ll_X_l_rem(long long divs, long div, long *rem) +{ + long dum2; + __asm__("divl %2":"=a"(dum2), "=d"(*rem) + : "rm"(div), "A"(divs)); + + return dum2; + +} + +extern uint64_t div64_64(uint64_t dividend, uint64_t divisor); + +# else +# include <asm-generic/div64.h> +# endif /* CONFIG_X86_32 */ +#endif /* _ASM_X86_DIV64_H */ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |