4a7428c5a7
This should help clarify the purpose of the function that returns the host system's CPU cycle count. Signed-off-by: Christopher Covington <cov@codeaurora.org> Acked-by: Paolo Bonzini <pbonzini@redhat.com> ppc portion Acked-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
/*
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* Helpers for system instructions.
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*
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* Copyright (c) 2007 Jocelyn Mayer
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "cpu.h"
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#include "exec/helper-proto.h"
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#include "sysemu/sysemu.h"
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#include "qemu/timer.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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/* 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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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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/* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist. Just pass through the host cpu
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clock ticks. Also, don't bother taking PCC_OFS into account. */
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return (uint32_t)cpu_get_host_ticks();
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#endif
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}
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/* PALcode support special instructions */
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#ifndef CONFIG_USER_ONLY
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void helper_tbia(CPUAlphaState *env)
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{
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tlb_flush(CPU(alpha_env_get_cpu(env)), 1);
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}
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void helper_tbis(CPUAlphaState *env, uint64_t p)
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{
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tlb_flush_page(CPU(alpha_env_get_cpu(env)), p);
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}
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void helper_tb_flush(CPUAlphaState *env)
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{
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tb_flush(CPU(alpha_env_get_cpu(env)));
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}
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void helper_halt(uint64_t restart)
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{
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if (restart) {
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qemu_system_reset_request();
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} else {
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qemu_system_shutdown_request();
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}
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}
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uint64_t helper_get_vmtime(void)
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{
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return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
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}
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uint64_t helper_get_walltime(void)
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{
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return qemu_clock_get_ns(rtc_clock);
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}
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void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
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{
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AlphaCPU *cpu = alpha_env_get_cpu(env);
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if (expire) {
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env->alarm_expire = expire;
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timer_mod(cpu->alarm_timer, expire);
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} else {
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timer_del(cpu->alarm_timer);
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}
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}
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#endif /* CONFIG_USER_ONLY */
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