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| /*
| * Copyright (C) 2000, 2004, 2021 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 <asm/bitsperlong.h>
|
| #if BITS_PER_LONG == 32
|
| /*
| * No traps on overflows for any of these...
| */
|
| #define do_div64_32(res, high, low, base) ({ \
| unsigned long __cf, __tmp, __tmp2, __i; \
| unsigned long __quot32, __mod32; \
| \
| __asm__( \
| " .set push \n" \
| " .set noat \n" \
| " .set noreorder \n" \
| " move %2, $0 \n" \
| " move %3, $0 \n" \
| " b 1f \n" \
| " li %4, 0x21 \n" \
| "0: \n" \
| " sll $1, %0, 0x1 \n" \
| " srl %3, %0, 0x1f \n" \
| " or %0, $1, %5 \n" \
| " sll %1, %1, 0x1 \n" \
| " sll %2, %2, 0x1 \n" \
| "1: \n" \
| " bnez %3, 2f \n" \
| " sltu %5, %0, %z6 \n" \
| " bnez %5, 3f \n" \
| "2: \n" \
| " addiu %4, %4, -1 \n" \
| " subu %0, %0, %z6 \n" \
| " addiu %2, %2, 1 \n" \
| "3: \n" \
| " bnez %4, 0b \n" \
| " srl %5, %1, 0x1f \n" \
| " .set pop" \
| : "=&r" (__mod32), "=&r" (__tmp), \
| "=&r" (__quot32), "=&r" (__cf), \
| "=&r" (__i), "=&r" (__tmp2) \
| : "Jr" (base), "0" (high), "1" (low)); \
| \
| (res) = __quot32; \
| __mod32; \
| })
|
| #define __div64_32(n, base) ({ \
| unsigned long __upper, __low, __high, __radix; \
| unsigned long long __quot; \
| unsigned long long __div; \
| unsigned long __mod; \
| \
| __div = (*n); \
| __radix = (base); \
| \
| __high = __div >> 32; \
| __low = __div; \
| \
| if (__high < __radix) { \
| __upper = __high; \
| __high = 0; \
| } else { \
| __upper = __high % __radix; \
| __high /= __radix; \
| } \
| \
| __mod = do_div64_32(__low, __upper, __low, __radix); \
| \
| __quot = __high; \
| __quot = __quot << 32 | __low; \
| (*n) = __quot; \
| __mod; \
| })
|
| #endif /* BITS_PER_LONG == 32 */
|
| #include <asm-generic/div64.h>
|
| #endif /* __ASM_DIV64_H */
|
|
