1 /* 2 * Copyright (C) 2000, 2004 Maciej W. Rozycki 3 * Copyright (C) 2003, 07 Ralf Baechle (ralf (at) 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 <linux/types.h> 13 14 #if (_MIPS_SZLONG == 32) 15 16 #include <asm/compiler.h> 17 18 /* 19 * No traps on overflows for any of these... 20 */ 21 22 #define do_div64_32(res, high, low, base) ({ \ 23 unsigned long __quot32, __mod32; \ 24 unsigned long __cf, __tmp, __tmp2, __i; \ 25 \ 26 __asm__(".set push\n\t" \ 27 ".set noat\n\t" \ 28 ".set noreorder\n\t" \ 29 "move %2, $0\n\t" \ 30 "move %3, $0\n\t" \ 31 "b 1f\n\t" \ 32 " li %4, 0x21\n" \ 33 "0:\n\t" \ 34 "sll $1, %0, 0x1\n\t" \ 35 "srl %3, %0, 0x1f\n\t" \ 36 "or %0, $1, %5\n\t" \ 37 "sll %1, %1, 0x1\n\t" \ 38 "sll %2, %2, 0x1\n" \ 39 "1:\n\t" \ 40 "bnez %3, 2f\n\t" \ 41 " sltu %5, %0, %z6\n\t" \ 42 "bnez %5, 3f\n" \ 43 "2:\n\t" \ 44 " addiu %4, %4, -1\n\t" \ 45 "subu %0, %0, %z6\n\t" \ 46 "addiu %2, %2, 1\n" \ 47 "3:\n\t" \ 48 "bnez %4, 0b\n\t" \ 49 " srl %5, %1, 0x1f\n\t" \ 50 ".set pop" \ 51 : "=&r" (__mod32), "=&r" (__tmp), \ 52 "=&r" (__quot32), "=&r" (__cf), \ 53 "=&r" (__i), "=&r" (__tmp2) \ 54 : "Jr" (base), "0" (high), "1" (low)); \ 55 \ 56 (res) = __quot32; \ 57 __mod32; }) 58 59 #define do_div(n, base) ({ \ 60 unsigned long long __quot; \ 61 unsigned long __mod; \ 62 unsigned long long __div; \ 63 unsigned long __upper, __low, __high, __base; \ 64 \ 65 __div = (n); \ 66 __base = (base); \ 67 \ 68 __high = __div >> 32; \ 69 __low = __div; \ 70 __upper = __high; \ 71 \ 72 if (__high) \ 73 __asm__("divu $0, %z2, %z3" \ 74 : "=h" (__upper), "=l" (__high) \ 75 : "Jr" (__high), "Jr" (__base) \ 76 : GCC_REG_ACCUM); \ 77 \ 78 __mod = do_div64_32(__low, __upper, __low, __base); \ 79 \ 80 __quot = __high; \ 81 __quot = __quot << 32 | __low; \ 82 (n) = __quot; \ 83 __mod; }) 84 85 #endif /* (_MIPS_SZLONG == 32) */ 86 87 #if (_MIPS_SZLONG == 64) 88 89 /* 90 * Hey, we're already 64-bit, no 91 * need to play games.. 92 */ 93 #define do_div(n, base) ({ \ 94 unsigned long __quot; \ 95 unsigned int __mod; \ 96 unsigned long __div; \ 97 unsigned int __base; \ 98 \ 99 __div = (n); \ 100 __base = (base); \ 101 \ 102 __mod = __div % __base; \ 103 __quot = __div / __base; \ 104 \ 105 (n) = __quot; \ 106 __mod; }) 107 108 #endif /* (_MIPS_SZLONG == 64) */ 109 110 #endif /* _ASM_DIV64_H */ 111
