2 * Helpers for system instructions.
4 * Copyright (c) 2007 Jocelyn Mayer
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
20 #include "qemu/osdep.h"
22 #include "exec/helper-proto.h"
23 #include "sysemu/sysemu.h"
24 #include "qemu/timer.h"
27 uint64_t helper_load_pcc(CPUAlphaState *env)
29 #ifndef CONFIG_USER_ONLY
30 /* In system mode we have access to a decent high-resolution clock.
31 In order to make OS-level time accounting work with the RPCC,
32 present it with a well-timed clock fixed at 250MHz. */
33 return (((uint64_t)env->pcc_ofs << 32)
34 | (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2));
36 /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist. Just pass through the host cpu
37 clock ticks. Also, don't bother taking PCC_OFS into account. */
38 return (uint32_t)cpu_get_host_ticks();
42 /* PALcode support special instructions */
43 #ifndef CONFIG_USER_ONLY
44 void helper_tbia(CPUAlphaState *env)
46 tlb_flush(CPU(alpha_env_get_cpu(env)), 1);
49 void helper_tbis(CPUAlphaState *env, uint64_t p)
51 tlb_flush_page(CPU(alpha_env_get_cpu(env)), p);
54 void helper_tb_flush(CPUAlphaState *env)
56 tb_flush(CPU(alpha_env_get_cpu(env)));
59 void helper_halt(uint64_t restart)
62 qemu_system_reset_request();
64 qemu_system_shutdown_request();
68 uint64_t helper_get_vmtime(void)
70 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
73 uint64_t helper_get_walltime(void)
75 return qemu_clock_get_ns(rtc_clock);
78 void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
80 AlphaCPU *cpu = alpha_env_get_cpu(env);
83 env->alarm_expire = expire;
84 timer_mod(cpu->alarm_timer, expire);
86 timer_del(cpu->alarm_timer);
90 #endif /* CONFIG_USER_ONLY */