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/*
* Helpers for system instructions.
*
* Copyright (c) 2007 Jocelyn Mayer
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "cpu.h"
#include "helper.h"
#include "sysemu/sysemu.h"
#include "qemu/timer.h"
uint64_t helper_load_pcc(CPUAlphaState *env)
{
#ifndef CONFIG_USER_ONLY
/* In system mode we have access to a decent high-resolution clock.
In order to make OS-level time accounting work with the RPCC,
present it with a well-timed clock fixed at 250MHz. */
return (((uint64_t)env->pcc_ofs << 32)
| (uint32_t)(qemu_get_clock_ns(vm_clock) >> 2));
#else
/* In user-mode, vm_clock doesn't exist. Just pass through the host cpu
clock ticks. Also, don't bother taking PCC_OFS into account. */
return (uint32_t)cpu_get_real_ticks();
#endif
}
/* PALcode support special instructions */
#ifndef CONFIG_USER_ONLY
void helper_hw_ret(CPUAlphaState *env, uint64_t a)
{
env->pc = a & ~3;
env->intr_flag = 0;
env->lock_addr = -1;
if ((a & 1) == 0) {
env->pal_mode = 0;
swap_shadow_regs(env);
}
}
void helper_call_pal(CPUAlphaState *env, uint64_t pc, uint64_t entry_ofs)
{
int pal_mode = env->pal_mode;
env->exc_addr = pc | pal_mode;
env->pc = env->palbr + entry_ofs;
if (!pal_mode) {
env->pal_mode = 1;
swap_shadow_regs(env);
}
}
void helper_tbia(CPUAlphaState *env)
{
tlb_flush(env, 1);
}
void helper_tbis(CPUAlphaState *env, uint64_t p)
{
tlb_flush_page(env, p);
}
void helper_halt(uint64_t restart)
{
if (restart) {
qemu_system_reset_request();
} else {
qemu_system_shutdown_request();
}
}
uint64_t helper_get_vmtime(void)
{
return qemu_get_clock_ns(vm_clock);
}
uint64_t helper_get_walltime(void)
{
return qemu_get_clock_ns(rtc_clock);
}
void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
{
AlphaCPU *cpu = alpha_env_get_cpu(env);
if (expire) {
env->alarm_expire = expire;
qemu_mod_timer(cpu->alarm_timer, expire);
} else {
qemu_del_timer(cpu->alarm_timer);
}
}
#endif /* CONFIG_USER_ONLY */
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