19e0cbb82f
Basing the alarm off the rtc_clock was silly. It leads to horrible spinning in the guest after being suspended and resumed, as it tries to catch up with lost ticks. This requires adding an accessor for reading the vm_clock too. Signed-off-by: Richard Henderson <rth@twiddle.net>
95 lines
2.4 KiB
C
95 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 "helper.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_get_clock_ns(vm_clock) >> 2));
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#else
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/* In user-mode, vm_clock 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_real_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_hw_ret(CPUAlphaState *env, uint64_t a)
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{
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env->pc = a & ~3;
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env->intr_flag = 0;
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env->lock_addr = -1;
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if ((a & 1) == 0) {
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env->pal_mode = 0;
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swap_shadow_regs(env);
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}
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}
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void helper_tbia(CPUAlphaState *env)
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{
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tlb_flush(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(env, p);
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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_get_clock_ns(vm_clock);
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}
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uint64_t helper_get_walltime(void)
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{
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return qemu_get_clock_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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qemu_mod_timer(cpu->alarm_timer, expire);
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} else {
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qemu_del_timer(cpu->alarm_timer);
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}
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}
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#endif /* CONFIG_USER_ONLY */
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