| /* |
| * Copyright (c) 2017, Google Inc. All rights reserved |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining |
| * a copy of this software and associated documentation files |
| * (the "Software"), to deal in the Software without restriction, |
| * including without limitation the rights to use, copy, modify, merge, |
| * publish, distribute, sublicense, and/or sell copies of the Software, |
| * and to permit persons to whom the Software is furnished to do so, |
| * subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be |
| * included in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. |
| * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY |
| * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, |
| * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE |
| * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| #include <asm.h> |
| #include <lib/sm/monitor.h> |
| |
| #define CPUID_ARM_GENTIMER_EXT_MASK (0xF << 16) |
| |
| /* |
| * Reset CNTVOFF register to zero as inittial state is undefined on ARM v7 |
| * |
| * Must be in Secure Monitor Mode with NS bit set. |
| */ |
| FUNCTION(virt_timer_init) |
| push {r0} |
| cps #MODE_MON |
| |
| SWITCH_SCR_TO_NONSECURE r0 |
| |
| mrc p15, 0, r0, c0, c1, 1 /* read ID_PFR1 */ |
| ands r0, r0, #CPUID_ARM_GENTIMER_EXT_MASK /* test arch timer bits */ |
| movne r0, #0 |
| mcrrne p15, 4, r0, r0, c14 /* Reset CNTVOFF to zero */ |
| |
| SWITCH_SCR_TO_SECURE r0 |
| |
| cps #MODE_SVC |
| pop {r0} |
| bx lr |
