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