1 /* 2 * Helpers for HPPA system instructions. 3 * 4 * Copyright (c) 2016 Richard Henderson <rth@twiddle.net> 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 "qemu/timer.h" 25 #include "sysemu/runstate.h" 26 27 void HELPER(write_interval_timer)(CPUHPPAState *env, target_ulong val) 28 { 29 HPPACPU *cpu = env_archcpu(env); 30 uint64_t current = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 31 uint64_t timeout; 32 33 /* 34 * Even in 64-bit mode, the comparator is always 32-bit. But the 35 * value we expose to the guest is 1/4 of the speed of the clock, 36 * so moosh in 34 bits. 37 */ 38 timeout = deposit64(current, 0, 34, (uint64_t)val << 2); 39 40 /* If the mooshing puts the clock in the past, advance to next round. */ 41 if (timeout < current + 1000) { 42 timeout += 1ULL << 34; 43 } 44 45 cpu->env.cr[CR_IT] = timeout; 46 timer_mod(cpu->alarm_timer, timeout); 47 } 48 49 void HELPER(halt)(CPUHPPAState *env) 50 { 51 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 52 helper_excp(env, EXCP_HLT); 53 } 54 55 void HELPER(reset)(CPUHPPAState *env) 56 { 57 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 58 helper_excp(env, EXCP_HLT); 59 } 60 61 target_ulong HELPER(swap_system_mask)(CPUHPPAState *env, target_ulong nsm) 62 { 63 target_ulong psw = env->psw; 64 /* 65 * Setting the PSW Q bit to 1, if it was not already 1, is an 66 * undefined operation. 67 * 68 * However, HP-UX 10.20 does this with the SSM instruction. 69 * Tested this on HP9000/712 and HP9000/785/C3750 and both 70 * machines set the Q bit from 0 to 1 without an exception, 71 * so let this go without comment. 72 */ 73 env->psw = (psw & ~PSW_SM) | (nsm & PSW_SM); 74 return psw & PSW_SM; 75 } 76 77 void HELPER(rfi)(CPUHPPAState *env) 78 { 79 env->iasq_f = (uint64_t)env->cr[CR_IIASQ] << 32; 80 env->iasq_b = (uint64_t)env->cr_back[0] << 32; 81 env->iaoq_f = env->cr[CR_IIAOQ]; 82 env->iaoq_b = env->cr_back[1]; 83 84 /* 85 * For pa2.0, IIASQ is the top bits of the virtual address. 86 * To recreate the space identifier, remove the offset bits. 87 */ 88 if (hppa_is_pa20(env)) { 89 env->iasq_f &= ~env->iaoq_f; 90 env->iasq_b &= ~env->iaoq_b; 91 } 92 93 cpu_hppa_put_psw(env, env->cr[CR_IPSW]); 94 } 95 96 void HELPER(getshadowregs)(CPUHPPAState *env) 97 { 98 env->gr[1] = env->shadow[0]; 99 env->gr[8] = env->shadow[1]; 100 env->gr[9] = env->shadow[2]; 101 env->gr[16] = env->shadow[3]; 102 env->gr[17] = env->shadow[4]; 103 env->gr[24] = env->shadow[5]; 104 env->gr[25] = env->shadow[6]; 105 } 106 107 void HELPER(rfi_r)(CPUHPPAState *env) 108 { 109 helper_getshadowregs(env); 110 helper_rfi(env); 111 } 112