diff options
Diffstat (limited to 'arch/mips/include/asm/div64.h')
| -rw-r--r-- | arch/mips/include/asm/div64.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/arch/mips/include/asm/div64.h b/arch/mips/include/asm/div64.h new file mode 100644 index 0000000..d1d6991 --- /dev/null +++ b/arch/mips/include/asm/div64.h @@ -0,0 +1,110 @@ +/* + * 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 __quot32, __mod32; \ + 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" (__mod32), "=&r" (__tmp), \ + "=&r" (__quot32), "=&r" (__cf), \ + "=&r" (__i), "=&r" (__tmp2) \ + : "Jr" (base), "0" (high), "1" (low)); \ + \ + (res) = __quot32; \ + __mod32; }) + +#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; }) + +#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; }) + +#endif /* (_MIPS_SZLONG == 64) */ + +#endif /* _ASM_DIV64_H */ |
