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