ahci: Reorder error cases in handle_cmd
[qemu.git] / target-alpha / sys_helper.c
1 /*
2 * Helpers for system instructions.
3 *
4 * Copyright (c) 2007 Jocelyn Mayer
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 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 "cpu.h"
21 #include "exec/helper-proto.h"
22 #include "sysemu/sysemu.h"
23 #include "qemu/timer.h"
24
25
26 uint64_t helper_load_pcc(CPUAlphaState *env)
27 {
28 #ifndef CONFIG_USER_ONLY
29 /* In system mode we have access to a decent high-resolution clock.
30 In order to make OS-level time accounting work with the RPCC,
31 present it with a well-timed clock fixed at 250MHz. */
32 return (((uint64_t)env->pcc_ofs << 32)
33 | (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2));
34 #else
35 /* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist. Just pass through the host cpu
36 clock ticks. Also, don't bother taking PCC_OFS into account. */
37 return (uint32_t)cpu_get_real_ticks();
38 #endif
39 }
40
41 /* PALcode support special instructions */
42 #ifndef CONFIG_USER_ONLY
43 void helper_hw_ret(CPUAlphaState *env, uint64_t a)
44 {
45 env->pc = a & ~3;
46 env->intr_flag = 0;
47 env->lock_addr = -1;
48 if ((a & 1) == 0) {
49 env->pal_mode = 0;
50 swap_shadow_regs(env);
51 }
52 }
53
54 void helper_call_pal(CPUAlphaState *env, uint64_t pc, uint64_t entry_ofs)
55 {
56 int pal_mode = env->pal_mode;
57 env->exc_addr = pc | pal_mode;
58 env->pc = env->palbr + entry_ofs;
59 if (!pal_mode) {
60 env->pal_mode = 1;
61 swap_shadow_regs(env);
62 }
63 }
64
65 void helper_tbia(CPUAlphaState *env)
66 {
67 tlb_flush(CPU(alpha_env_get_cpu(env)), 1);
68 }
69
70 void helper_tbis(CPUAlphaState *env, uint64_t p)
71 {
72 tlb_flush_page(CPU(alpha_env_get_cpu(env)), p);
73 }
74
75 void helper_tb_flush(CPUAlphaState *env)
76 {
77 tb_flush(env);
78 }
79
80 void helper_halt(uint64_t restart)
81 {
82 if (restart) {
83 qemu_system_reset_request();
84 } else {
85 qemu_system_shutdown_request();
86 }
87 }
88
89 uint64_t helper_get_vmtime(void)
90 {
91 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
92 }
93
94 uint64_t helper_get_walltime(void)
95 {
96 return qemu_clock_get_ns(rtc_clock);
97 }
98
99 void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
100 {
101 AlphaCPU *cpu = alpha_env_get_cpu(env);
102
103 if (expire) {
104 env->alarm_expire = expire;
105 timer_mod(cpu->alarm_timer, expire);
106 } else {
107 timer_del(cpu->alarm_timer);
108 }
109 }
110
111 #endif /* CONFIG_USER_ONLY */