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
HELPER(write_interval_timer)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
HELPER(halt)49 void HELPER(halt)(CPUHPPAState *env)
50 {
51 qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
52 helper_excp(env, EXCP_HLT);
53 }
54
HELPER(reset)55 void HELPER(reset)(CPUHPPAState *env)
56 {
57 qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
58 helper_excp(env, EXCP_HLT);
59 }
60
HELPER(swap_system_mask)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
HELPER(rfi)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
HELPER(getshadowregs)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
HELPER(rfi_r)107 void HELPER(rfi_r)(CPUHPPAState *env)
108 {
109 helper_getshadowregs(env);
110 helper_rfi(env);
111 }
112