From ae0e8d3613ad9cb6872c58cd95fc9774b3b17f5b Mon Sep 17 00:00:00 2001 From: David Hendricks Date: Wed, 6 Mar 2013 20:43:55 -0800 Subject: Eliminate do_div(). This eliminates the use of do_div() in favor of using libgcc functions. This was tested by building and booting on Google Snow (ARMv7) and Qemu (x86). printk()s which use division in vtxprintf() look good. Change-Id: Icad001d84a3c05bfbf77098f3d644816280b4a4d Signed-off-by: Gabe Black Signed-off-by: David Hendricks Reviewed-on: http://review.coreboot.org/2606 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Ronald G. Minnich --- src/arch/x86/include/div64.h | 30 ------------------------------ 1 file changed, 30 deletions(-) delete mode 100644 src/arch/x86/include/div64.h (limited to 'src/arch/x86/include') diff --git a/src/arch/x86/include/div64.h b/src/arch/x86/include/div64.h deleted file mode 100644 index bbc9921d29..0000000000 --- a/src/arch/x86/include/div64.h +++ /dev/null @@ -1,30 +0,0 @@ -#ifndef __I386_DIV64 -#define __I386_DIV64 - -/* - * 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; \ -}) - -#endif -- cgit v1.2.3