| /* | |
| * This program is free software; you can redistribute it and/or | |
| * modify it under the terms of the GNU General Public License | |
| * as published by the Free Software Foundation; version 2 | |
| * of the License. | |
| * | |
| */ | |
| #include <linux/linkage.h> | |
| #include <asm/export.h> | |
| .text | |
| /* | |
| * Inputs: | |
| * %esi : memory location to compare | |
| * %eax : low 32 bits of old value | |
| * %edx : high 32 bits of old value | |
| * %ebx : low 32 bits of new value | |
| * %ecx : high 32 bits of new value | |
| */ | |
| ENTRY(cmpxchg8b_emu) | |
| # | |
| # Emulate 'cmpxchg8b (%esi)' on UP except we don't | |
| # set the whole ZF thing (caller will just compare | |
| # eax:edx with the expected value) | |
| # | |
| pushfl | |
| cli | |
| cmpl (%esi), %eax | |
| jne .Lnot_same | |
| cmpl 4(%esi), %edx | |
| jne .Lhalf_same | |
| movl %ebx, (%esi) | |
| movl %ecx, 4(%esi) | |
| popfl | |
| ret | |
| .Lnot_same: | |
| movl (%esi), %eax | |
| .Lhalf_same: | |
| movl 4(%esi), %edx | |
| popfl | |
| ret | |
| ENDPROC(cmpxchg8b_emu) | |
| EXPORT_SYMBOL(cmpxchg8b_emu) |