1 /* 2 * Helpers for system instructions. 3 * 4 * Copyright (c) 2007 Jocelyn Mayer 5 * 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 2.1 of the License, or (at your option) any later version. 10 * 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. 15 * 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/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "cpu.h" 22 #include "exec/exec-all.h" 23 #include "exec/helper-proto.h" 24 #include "sysemu/runstate.h" 25 #include "sysemu/sysemu.h" 26 #include "qemu/timer.h" 27 28 29 uint64_t helper_load_pcc(CPUAlphaState *env) 30 { 31 #ifndef CONFIG_USER_ONLY 32 /* In system mode we have access to a decent high-resolution clock. 33 In order to make OS-level time accounting work with the RPCC, 34 present it with a well-timed clock fixed at 250MHz. */ 35 return (((uint64_t)env->pcc_ofs << 32) 36 | (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2)); 37 #else 38 /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist. Just pass through the host cpu 39 clock ticks. Also, don't bother taking PCC_OFS into account. */ 40 return (uint32_t)cpu_get_host_ticks(); 41 #endif 42 } 43 44 /* PALcode support special instructions */ 45 #ifndef CONFIG_USER_ONLY 46 void helper_tbia(CPUAlphaState *env) 47 { 48 tlb_flush(env_cpu(env)); 49 } 50 51 void helper_tbis(CPUAlphaState *env, uint64_t p) 52 { 53 tlb_flush_page(env_cpu(env), p); 54 } 55 56 void helper_tb_flush(CPUAlphaState *env) 57 { 58 tb_flush(env_cpu(env)); 59 } 60 61 void helper_halt(uint64_t restart) 62 { 63 if (restart) { 64 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 65 } else { 66 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 67 } 68 } 69 70 uint64_t helper_get_vmtime(void) 71 { 72 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 73 } 74 75 uint64_t helper_get_walltime(void) 76 { 77 return qemu_clock_get_ns(rtc_clock); 78 } 79 80 void helper_set_alarm(CPUAlphaState *env, uint64_t expire) 81 { 82 AlphaCPU *cpu = env_archcpu(env); 83 84 if (expire) { 85 env->alarm_expire = expire; 86 timer_mod(cpu->alarm_timer, expire); 87 } else { 88 timer_del(cpu->alarm_timer); 89 } 90 } 91 92 #endif /* CONFIG_USER_ONLY */ 93