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
HELPER(write_interval_timer)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
HELPER(halt)52 void HELPER(halt)(CPUHPPAState *env)
53 {
54 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
55 helper_excp(env, EXCP_HLT);
56 }
57
HELPER(reset)58 void HELPER(reset)(CPUHPPAState *env)
59 {
60 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
61 helper_excp(env, EXCP_HLT);
62 }
63
HELPER(swap_system_mask)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
HELPER(rfi)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
getshadowregs(CPUHPPAState * env)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
HELPER(rfi_r)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 */
HELPER(diag_console_output)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