projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| b341712e | 1 | #/*++\r |
| 2 | #\r | |
| 4ea9375a HT |
3 | #Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>\r |
| 4 | #This program and the accompanying materials \r | |
| b341712e | 5 | #are licensed and made available under the terms and conditions of the BSD License \r |
| 6 | #which accompanies this distribution. The full text of the license may be found at \r | |
| 7 | #http://opensource.org/licenses/bsd-license.php \r | |
| 8 | # \r | |
| 9 | #THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
| 10 | #WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
| 11 | #\r | |
| 12 | #Module Name:\r | |
| 13 | #\r | |
| 14 | # LShiftU64.c\r | |
| 15 | #\r | |
| 16 | #Abstract:\r | |
| 17 | #\r | |
| 18 | # 64-bit left shift function for IA-32\r | |
| 19 | #\r | |
| 20 | #--*/\r | |
| 21 | #\r | |
| 22 | #include "EfiBind.h"\r | |
| 23 | #---------------------------------------------------------------------------\r | |
| 24 | .686: \r | |
| 25 | #.MODEL flat,C\r | |
| 26 | .code: \r | |
| 27 | \r | |
| 28 | #---------------------------------------------------------------------------\r | |
| 29 | .globl ASM_PFX(LShiftU64)\r | |
| 30 | #\r | |
| 31 | #UINT64\r | |
| 32 | #LShiftU64 (\r | |
| 33 | # IN UINT64 Operand,\r | |
| 34 | # IN UINTN Count\r | |
| 35 | # )\r | |
| 36 | #/*++\r | |
| 37 | #\r | |
| 38 | #Routine Description:\r | |
| 39 | # \r | |
| 40 | # This routine allows a 64 bit value to be left shifted by 32 bits and \r | |
| 41 | # returns the shifted value.\r | |
| 42 | # Count is valid up 63. (Only Bits 0-5 is valid for Count)\r | |
| 43 | #\r | |
| 44 | #Arguments:\r | |
| 45 | #\r | |
| 46 | # Operand - Value to be shifted\r | |
| 47 | # Count - Number of times to shift left.\r | |
| 48 | # \r | |
| 49 | #Returns:\r | |
| 50 | #\r | |
| 51 | # Value shifted left identified by the Count.\r | |
| 52 | #\r | |
| 53 | #--*/\r | |
| 54 | ASM_PFX(LShiftU64):\r | |
| 55 | \r | |
| 56 | movl 4(%esp), %eax # dword ptr Operand[0]\r | |
| 57 | movl 8(%esp), %edx # dword ptr Operand[4]\r | |
| 58 | \r | |
| 59 | #\r | |
| 60 | # CL is valid from 0 - 31. shld will move EDX:EAX by CL times but EAX is not touched\r | |
| 61 | # For CL of 32 - 63, it will be shifted 0 - 31 so we will move eax to edx later. \r | |
| 62 | #\r | |
| 63 | movl 0xC(%esp), %ecx # Count\r | |
| 64 | andl $63, %ecx\r | |
| 65 | shld %cl, %eax, %edx\r | |
| 66 | shlb %cl, %eax\r | |
| 67 | \r | |
| 68 | #\r | |
| 69 | # Since Count is 32 - 63, eax will have been shifted by 0 - 31 \r | |
| 70 | # If shifted by 32 or more, set lower 32 bits to zero.\r | |
| 71 | #\r | |
| 72 | cmpl $32, %ecx\r | |
| 73 | jc _LShiftU64_Done\r | |
| 74 | \r | |
| 75 | movl %eax, %edx\r | |
| 76 | xorl %eax, %eax\r | |
| 77 | \r | |
| 78 | _LShiftU64_Done: \r | |
| 79 | \r | |
| 80 | ret\r | |
| 81 | #LShiftU64 ENDP\r | |
| 82 | \r |