| #/*++ | |
| # | |
| #Copyright (c) 2006, Intel Corporation. All rights reserved.<BR> | |
| #This program and the accompanying materials | |
| #are licensed and made available under the terms and conditions of the BSD License | |
| #which accompanies this distribution. The full text of the license may be found at | |
| #http://opensource.org/licenses/bsd-license.php | |
| # | |
| #THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
| #WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
| # | |
| #Module Name: | |
| # | |
| # MultU64x32.c | |
| # | |
| #Abstract: | |
| # | |
| # 64-bit Multiplication function for IA-32 | |
| # | |
| #--*/ | |
| #include "EfiBind.h" | |
| #--------------------------------------------------------------------------- | |
| .686: | |
| #.MODEL flat,C | |
| .code: | |
| #--------------------------------------------------------------------------- | |
| .globl ASM_PFX(MultU64x32) | |
| #UINT64 | |
| #MultU64x32 ( | |
| # IN UINT64 Multiplicand, | |
| # IN UINTN Multiplier | |
| # ) | |
| #/*++ | |
| # | |
| #Routine Description: | |
| # | |
| # This routine allows a 64 bit value to be multiplied with a 32 bit | |
| # value returns 64bit result. | |
| # No checking if the result is greater than 64bits | |
| # | |
| #Arguments: | |
| # | |
| # Multiplicand - multiplicand | |
| # Multiplier - multiplier | |
| # | |
| #Returns: | |
| # | |
| # Multiplicand * Multiplier | |
| # | |
| #--*/ | |
| ASM_PFX(MultU64x32): | |
| movl 4(%esp), %eax # dword ptr Multiplicand[0] | |
| mull 0xC(%esp) # Multiplier | |
| pushl %eax | |
| pushl %edx | |
| movl 0x10(%esp), %eax # dword ptr Multiplicand[4] | |
| mull 0x14(%esp) # Multiplier | |
| # | |
| # The value in edx stored by second multiplication overflows | |
| # the output and should be discarded. So here we overwrite it | |
| # with the edx value of first multiplication. | |
| # | |
| popl %edx | |
| addl %eax, %edx | |
| popl %eax | |
| ret | |
| #MultU64x32 ENDP | |