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