90 lines
2.3 KiB
C
90 lines
2.3 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_time(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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