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/helper-proto.h"
24 #include "qemu/timer.h"
25 #include "system/runstate.h"
26 #include "system/system.h"
27 #include "chardev/char-fe.h"
28
HELPER(write_interval_timer)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
HELPER(halt)51 void HELPER(halt)(CPUHPPAState *env)
52 {
53 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
54 helper_excp(env, EXCP_HLT);
55 }
56
HELPER(reset)57 void HELPER(reset)(CPUHPPAState *env)
58 {
59 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
60 helper_excp(env, EXCP_HLT);
61 }
62
HELPER(swap_system_mask)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 cpu_hppa_put_psw(env, (psw & ~PSW_SM) | (nsm & PSW_SM));
76 return psw & PSW_SM;
77 }
78
HELPER(rfi)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 = env->gva_offset_mask;
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 if (qemu_loglevel_mask(CPU_LOG_INT)) {
98 FILE *logfile = qemu_log_trylock();
99 if (logfile) {
100 CPUState *cs = env_cpu(env);
101
102 fprintf(logfile, "RFI: cpu %d\n", cs->cpu_index);
103 hppa_cpu_dump_state(cs, logfile, 0);
104 qemu_log_unlock(logfile);
105 }
106 }
107 }
108
getshadowregs(CPUHPPAState * env)109 static void getshadowregs(CPUHPPAState *env)
110 {
111 env->gr[1] = env->shadow[0];
112 env->gr[8] = env->shadow[1];
113 env->gr[9] = env->shadow[2];
114 env->gr[16] = env->shadow[3];
115 env->gr[17] = env->shadow[4];
116 env->gr[24] = env->shadow[5];
117 env->gr[25] = env->shadow[6];
118 }
119
HELPER(rfi_r)120 void HELPER(rfi_r)(CPUHPPAState *env)
121 {
122 getshadowregs(env);
123 helper_rfi(env);
124 }
125
126 #ifndef CONFIG_USER_ONLY
127 /*
128 * diag_console_output() is a helper function used during the initial bootup
129 * process of the SeaBIOS-hppa firmware. During the bootup phase, addresses of
130 * serial ports on e.g. PCI busses are unknown and most other devices haven't
131 * been initialized and configured yet. With help of a simple "diag" assembler
132 * instruction and an ASCII character code in register %r26 firmware can easily
133 * print debug output without any dependencies to the first serial port and use
134 * that as serial console.
135 */
HELPER(diag_console_output)136 void HELPER(diag_console_output)(CPUHPPAState *env)
137 {
138 CharBackend *serial_backend;
139 Chardev *serial_port;
140 unsigned char c;
141
142 /* find first serial port */
143 serial_port = serial_hd(0);
144 if (!serial_port) {
145 return;
146 }
147
148 /* get serial_backend for the serial port */
149 serial_backend = serial_port->be;
150 if (!serial_backend ||
151 !qemu_chr_fe_backend_connected(serial_backend)) {
152 return;
153 }
154
155 c = (unsigned char)env->gr[26];
156 qemu_chr_fe_write(serial_backend, &c, sizeof(c));
157 }
158 #endif
159