projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| da351bdb PB |
1 | ;------------------------------------------------------------------------------\r |
| 2 | ;\r | |
| 3 | ; GetInterruptState() function for AArch64\r | |
| 4 | ;\r | |
| 5 | ; Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r | |
| 6 | ; Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r | |
| 7 | ; Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>\r | |
| 9344f092 | 8 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
| da351bdb PB |
9 | ;\r |
| 10 | ;------------------------------------------------------------------------------\r | |
| 11 | \r | |
| 12 | EXPORT GetInterruptState\r | |
| 13 | AREA BaseLib_LowLevel, CODE, READONLY\r | |
| 14 | \r | |
| 15 | DAIF_RD_IRQ_BIT EQU (1 << 7)\r | |
| 16 | \r | |
| 17 | ;/**\r | |
| 18 | ; Retrieves the current CPU interrupt state.\r | |
| 19 | ;\r | |
| 20 | ; Returns TRUE is interrupts are currently enabled. Otherwise\r | |
| 21 | ; returns FALSE.\r | |
| 22 | ;\r | |
| 23 | ; @retval TRUE CPU interrupts are enabled.\r | |
| 24 | ; @retval FALSE CPU interrupts are disabled.\r | |
| 25 | ;\r | |
| 26 | ;**/\r | |
| 27 | ;\r | |
| 28 | ;BOOLEAN\r | |
| 29 | ;EFIAPI\r | |
| 30 | ;GetInterruptState (\r | |
| 31 | ; VOID\r | |
| 32 | ; );\r | |
| 33 | ;\r | |
| 34 | GetInterruptState\r | |
| 35 | mrs x0, daif\r | |
| 36 | mov w0, wzr\r | |
| 37 | tst x0, #DAIF_RD_IRQ_BIT // Check IRQ mask; set Z=1 if clear/unmasked\r | |
| 38 | bne exit // if Z=1 (eq) return 1, else 0\r | |
| 39 | mov w0, #1\r | |
| 40 | exit\r | |
| 41 | ret\r | |
| 42 | \r | |
| 43 | END\r |