33 lines
861 B
C
33 lines
861 B
C
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/*
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* QEMU Alpha clock helpers.
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*
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* Copyright (c) 2007 Jocelyn Mayer
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "qemu/osdep.h"
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#include "qemu/timer.h"
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#include "exec/helper-proto.h"
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#include "cpu.h"
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uint64_t helper_load_pcc(CPUAlphaState *env)
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{
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#ifndef CONFIG_USER_ONLY
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/*
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* In system mode we have access to a decent high-resolution clock.
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* In order to make OS-level time accounting work with the RPCC,
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* present it with a well-timed clock fixed at 250MHz.
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*/
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return (((uint64_t)env->pcc_ofs << 32)
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| (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2));
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#else
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/*
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* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist. Just pass through
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* the host cpu clock ticks. Also, don't bother taking PCC_OFS into
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* account.
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*/
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return (uint32_t)cpu_get_host_ticks();
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#endif
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}
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