mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 14:43:58 +08:00
3927f2e8f9
Here is the current version of the 64 bit divide common code. Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org> Signed-off-by: David S. Miller <davem@davemloft.net>
116 lines
2.4 KiB
C
116 lines
2.4 KiB
C
/*
|
|
* Copyright (C) 2000, 2004 Maciej W. Rozycki
|
|
* Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org)
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#ifndef _ASM_DIV64_H
|
|
#define _ASM_DIV64_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
#if (_MIPS_SZLONG == 32)
|
|
|
|
#include <asm/compiler.h>
|
|
|
|
/*
|
|
* No traps on overflows for any of these...
|
|
*/
|
|
|
|
#define do_div64_32(res, high, low, base) ({ \
|
|
unsigned long __quot, __mod; \
|
|
unsigned long __cf, __tmp, __tmp2, __i; \
|
|
\
|
|
__asm__(".set push\n\t" \
|
|
".set noat\n\t" \
|
|
".set noreorder\n\t" \
|
|
"move %2, $0\n\t" \
|
|
"move %3, $0\n\t" \
|
|
"b 1f\n\t" \
|
|
" li %4, 0x21\n" \
|
|
"0:\n\t" \
|
|
"sll $1, %0, 0x1\n\t" \
|
|
"srl %3, %0, 0x1f\n\t" \
|
|
"or %0, $1, %5\n\t" \
|
|
"sll %1, %1, 0x1\n\t" \
|
|
"sll %2, %2, 0x1\n" \
|
|
"1:\n\t" \
|
|
"bnez %3, 2f\n\t" \
|
|
" sltu %5, %0, %z6\n\t" \
|
|
"bnez %5, 3f\n" \
|
|
"2:\n\t" \
|
|
" addiu %4, %4, -1\n\t" \
|
|
"subu %0, %0, %z6\n\t" \
|
|
"addiu %2, %2, 1\n" \
|
|
"3:\n\t" \
|
|
"bnez %4, 0b\n\t" \
|
|
" srl %5, %1, 0x1f\n\t" \
|
|
".set pop" \
|
|
: "=&r" (__mod), "=&r" (__tmp), "=&r" (__quot), "=&r" (__cf), \
|
|
"=&r" (__i), "=&r" (__tmp2) \
|
|
: "Jr" (base), "0" (high), "1" (low)); \
|
|
\
|
|
(res) = __quot; \
|
|
__mod; })
|
|
|
|
#define do_div(n, base) ({ \
|
|
unsigned long long __quot; \
|
|
unsigned long __mod; \
|
|
unsigned long long __div; \
|
|
unsigned long __upper, __low, __high, __base; \
|
|
\
|
|
__div = (n); \
|
|
__base = (base); \
|
|
\
|
|
__high = __div >> 32; \
|
|
__low = __div; \
|
|
__upper = __high; \
|
|
\
|
|
if (__high) \
|
|
__asm__("divu $0, %z2, %z3" \
|
|
: "=h" (__upper), "=l" (__high) \
|
|
: "Jr" (__high), "Jr" (__base) \
|
|
: GCC_REG_ACCUM); \
|
|
\
|
|
__mod = do_div64_32(__low, __upper, __low, __base); \
|
|
\
|
|
__quot = __high; \
|
|
__quot = __quot << 32 | __low; \
|
|
(n) = __quot; \
|
|
__mod; })
|
|
|
|
extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
|
|
#endif /* (_MIPS_SZLONG == 32) */
|
|
|
|
#if (_MIPS_SZLONG == 64)
|
|
|
|
/*
|
|
* Hey, we're already 64-bit, no
|
|
* need to play games..
|
|
*/
|
|
#define do_div(n, base) ({ \
|
|
unsigned long __quot; \
|
|
unsigned int __mod; \
|
|
unsigned long __div; \
|
|
unsigned int __base; \
|
|
\
|
|
__div = (n); \
|
|
__base = (base); \
|
|
\
|
|
__mod = __div % __base; \
|
|
__quot = __div / __base; \
|
|
\
|
|
(n) = __quot; \
|
|
__mod; })
|
|
|
|
static inline uint64_t div64_64(uint64_t dividend, uint64_t divisor)
|
|
{
|
|
return dividend / divisor;
|
|
}
|
|
|
|
#endif /* (_MIPS_SZLONG == 64) */
|
|
|
|
#endif /* _ASM_DIV64_H */
|