| 1 | /* |
| 2 | * QEMU Alpha clock helpers. |
| 3 | * |
| 4 | * Copyright (c) 2007 Jocelyn Mayer |
| 5 | * |
| 6 | * SPDX-License-Identifier: LGPL-2.1-or-later |
| 7 | */ |
| 8 | |
| 9 | #include "qemu/osdep.h" |
| 10 | #include "qemu/timer.h" |
| 11 | #include "exec/helper-proto.h" |
| 12 | #include "cpu.h" |
| 13 | |
| 14 | uint64_t helper_load_pcc(CPUAlphaState *env) |
| 15 | { |
| 16 | #ifndef CONFIG_USER_ONLY |
| 17 | /* |
| 18 | * In system mode we have access to a decent high-resolution clock. |
| 19 | * In order to make OS-level time accounting work with the RPCC, |
| 20 | * present it with a well-timed clock fixed at 250MHz. |
| 21 | */ |
| 22 | return (((uint64_t)env->pcc_ofs << 32) |
| 23 | | (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2)); |
| 24 | #else |
| 25 | /* |
| 26 | * In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist. Just pass through |
| 27 | * the host cpu clock ticks. Also, don't bother taking PCC_OFS into |
| 28 | * account. |
| 29 | */ |
| 30 | return (uint32_t)cpu_get_host_ticks(); |
| 31 | #endif |
| 32 | } |