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 "qemu/log.h" 22 #include "cpu.h" 23 #include "exec/exec-all.h" 24 #include "exec/helper-proto.h" 25 #include "qemu/timer.h" 26 #include "sysemu/runstate.h" 27 #include "sysemu/sysemu.h" 28 #include "chardev/char-fe.h" 29 30 void HELPER(write_interval_timer)(CPUHPPAState *env, target_ulong val) 31 { 32 HPPACPU *cpu = env_archcpu(env); 33 uint64_t current = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 34 uint64_t timeout; 35 36 /* 37 * Even in 64-bit mode, the comparator is always 32-bit. But the 38 * value we expose to the guest is 1/4 of the speed of the clock, 39 * so moosh in 34 bits. 40 */ 41 timeout = deposit64(current, 0, 34, (uint64_t)val << 2); 42 43 /* If the mooshing puts the clock in the past, advance to next round. */ 44 if (timeout < current + 1000) { 45 timeout += 1ULL << 34; 46 } 47 48 cpu->env.cr[CR_IT] = timeout; 49 timer_mod(cpu->alarm_timer, timeout); 50 } 51 52 void HELPER(halt)(CPUHPPAState *env) 53 { 54 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN); 55 helper_excp(env, EXCP_HLT); 56 } 57 58 void HELPER(reset)(CPUHPPAState *env) 59 { 60 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); 61 helper_excp(env, EXCP_HLT); 62 } 63 64 target_ulong HELPER(swap_system_mask)(CPUHPPAState *env, target_ulong nsm) 65 { 66 target_ulong psw = env->psw; 67 /* 68 * Setting the PSW Q bit to 1, if it was not already 1, is an 69 * undefined operation. 70 * 71 * However, HP-UX 10.20 does this with the SSM instruction. 72 * Tested this on HP9000/712 and HP9000/785/C3750 and both 73 * machines set the Q bit from 0 to 1 without an exception, 74 * so let this go without comment. 75 */ 76 env->psw = (psw & ~PSW_SM) | (nsm & PSW_SM); 77 return psw & PSW_SM; 78 } 79 80 void HELPER(rfi)(CPUHPPAState *env) 81 { 82 uint64_t mask; 83 84 cpu_hppa_put_psw(env, env->cr[CR_IPSW]); 85 86 /* 87 * For pa2.0, IIASQ is the top bits of the virtual address. 88 * To recreate the space identifier, remove the offset bits. 89 * For pa1.x, the mask reduces to no change to space. 90 */ 91 mask = gva_offset_mask(env->psw); 92 93 env->iaoq_f = env->cr[CR_IIAOQ]; 94 env->iaoq_b = env->cr_back[1]; 95 env->iasq_f = (env->cr[CR_IIASQ] << 32) & ~(env->iaoq_f & mask); 96 env->iasq_b = (env->cr_back[0] << 32) & ~(env->iaoq_b & mask); 97 98 if (qemu_loglevel_mask(CPU_LOG_INT)) { 99 FILE *logfile = qemu_log_trylock(); 100 if (logfile) { 101 CPUState *cs = env_cpu(env); 102 103 fprintf(logfile, "RFI: cpu %d\n", cs->cpu_index); 104 hppa_cpu_dump_state(cs, logfile, 0); 105 qemu_log_unlock(logfile); 106 } 107 } 108 } 109 110 static void getshadowregs(CPUHPPAState *env) 111 { 112 env->gr[1] = env->shadow[0]; 113 env->gr[8] = env->shadow[1]; 114 env->gr[9] = env->shadow[2]; 115 env->gr[16] = env->shadow[3]; 116 env->gr[17] = env->shadow[4]; 117 env->gr[24] = env->shadow[5]; 118 env->gr[25] = env->shadow[6]; 119 } 120 121 void HELPER(rfi_r)(CPUHPPAState *env) 122 { 123 getshadowregs(env); 124 helper_rfi(env); 125 } 126 127 #ifndef CONFIG_USER_ONLY 128 /* 129 * diag_console_output() is a helper function used during the initial bootup 130 * process of the SeaBIOS-hppa firmware. During the bootup phase, addresses of 131 * serial ports on e.g. PCI busses are unknown and most other devices haven't 132 * been initialized and configured yet. With help of a simple "diag" assembler 133 * instruction and an ASCII character code in register %r26 firmware can easily 134 * print debug output without any dependencies to the first serial port and use 135 * that as serial console. 136 */ 137 void HELPER(diag_console_output)(CPUHPPAState *env) 138 { 139 CharBackend *serial_backend; 140 Chardev *serial_port; 141 unsigned char c; 142 143 /* find first serial port */ 144 serial_port = serial_hd(0); 145 if (!serial_port) { 146 return; 147 } 148 149 /* get serial_backend for the serial port */ 150 serial_backend = serial_port->be; 151 if (!serial_backend || 152 !qemu_chr_fe_backend_connected(serial_backend)) { 153 return; 154 } 155 156 c = (unsigned char)env->gr[26]; 157 qemu_chr_fe_write(serial_backend, &c, sizeof(c)); 158 } 159 #endif 160