1 /* 2 * Copyright (C) 2000, 2004, 2021 Maciej W. Rozycki 3 * Copyright (C) 2003, 07 Ralf Baechle (ralf@linux-mips.org) 4 * 5 * This file is subject to the terms and conditions of the GNU General Public 6 * License. See the file "COPYING" in the main directory of this archive 7 * for more details. 8 */ 9 #ifndef __ASM_DIV64_H 10 #define __ASM_DIV64_H 11 12 #include <asm/bitsperlong.h> 13 14 #if BITS_PER_LONG == 32 15 16 /* 17 * No traps on overflows for any of these... 18 */ 19 20 #define do_div64_32(res, high, low, base) ({ \ 21 unsigned long __cf, __tmp, __tmp2, __i; \ 22 unsigned long __quot32, __mod32; \ 23 \ 24 __asm__( \ 25 " .set push \n" \ 26 " .set noat \n" \ 27 " .set noreorder \n" \ 28 " move %2, $0 \n" \ 29 " move %3, $0 \n" \ 30 " b 1f \n" \ 31 " li %4, 0x21 \n" \ 32 "0: \n" \ 33 " sll $1, %0, 0x1 \n" \ 34 " srl %3, %0, 0x1f \n" \ 35 " or %0, $1, %5 \n" \ 36 " sll %1, %1, 0x1 \n" \ 37 " sll %2, %2, 0x1 \n" \ 38 "1: \n" \ 39 " bnez %3, 2f \n" \ 40 " sltu %5, %0, %z6 \n" \ 41 " bnez %5, 3f \n" \ 42 "2: \n" \ 43 " addiu %4, %4, -1 \n" \ 44 " subu %0, %0, %z6 \n" \ 45 " addiu %2, %2, 1 \n" \ 46 "3: \n" \ 47 " bnez %4, 0b \n" \ 48 " srl %5, %1, 0x1f \n" \ 49 " .set pop" \ 50 : "=&r" (__mod32), "=&r" (__tmp), \ 51 "=&r" (__quot32), "=&r" (__cf), \ 52 "=&r" (__i), "=&r" (__tmp2) \ 53 : "Jr" (base), "0" (high), "1" (low)); \ 54 \ 55 (res) = __quot32; \ 56 __mod32; \ 57 }) 58 59 #define __div64_32(n, base) ({ \ 60 unsigned long __upper, __low, __high, __radix; \ 61 unsigned long long __modquot; \ 62 unsigned long long __quot; \ 63 unsigned long long __div; \ 64 unsigned long __mod; \ 65 \ 66 __div = (*n); \ 67 __radix = (base); \ 68 \ 69 __high = __div >> 32; \ 70 __low = __div; \ 71 \ 72 if (__high < __radix) { \ 73 __upper = __high; \ 74 __high = 0; \ 75 } else { \ 76 __asm__("divu $0, %z1, %z2" \ 77 : "=x" (__modquot) \ 78 : "Jr" (__high), "Jr" (__radix)); \ 79 __upper = __modquot >> 32; \ 80 __high = __modquot; \ 81 } \ 82 \ 83 __mod = do_div64_32(__low, __upper, __low, __radix); \ 84 \ 85 __quot = __high; \ 86 __quot = __quot << 32 | __low; \ 87 (*n) = __quot; \ 88 __mod; \ 89 }) 90 91 #endif /* BITS_PER_LONG == 32 */ 92 93 #include <asm-generic/div64.h> 94 95 #endif /* __ASM_DIV64_H */ 96