e1000: Avoid infinite loop in processing transmit descriptor (CVE-2015-6815)
[qemu/ar7.git] / target-alpha / sys_helper.c
blob1f0e1a967100eb15cdedb9dd2b73e6f1df8203d1
1 /*
2 * Helpers for system instructions.
4 * Copyright (c) 2007 Jocelyn Mayer
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.
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.
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/>.
20 #include "cpu.h"
21 #include "exec/helper-proto.h"
22 #include "sysemu/sysemu.h"
23 #include "qemu/timer.h"
26 uint64_t helper_load_pcc(CPUAlphaState *env)
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
41 /* PALcode support special instructions */
42 #ifndef CONFIG_USER_ONLY
43 void helper_tbia(CPUAlphaState *env)
45 tlb_flush(CPU(alpha_env_get_cpu(env)), 1);
48 void helper_tbis(CPUAlphaState *env, uint64_t p)
50 tlb_flush_page(CPU(alpha_env_get_cpu(env)), p);
53 void helper_tb_flush(CPUAlphaState *env)
55 tb_flush(CPU(alpha_env_get_cpu(env)));
58 void helper_halt(uint64_t restart)
60 if (restart) {
61 qemu_system_reset_request();
62 } else {
63 qemu_system_shutdown_request();
67 uint64_t helper_get_vmtime(void)
69 return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
72 uint64_t helper_get_walltime(void)
74 return qemu_clock_get_ns(rtc_clock);
77 void helper_set_alarm(CPUAlphaState *env, uint64_t expire)
79 AlphaCPU *cpu = alpha_env_get_cpu(env);
81 if (expire) {
82 env->alarm_expire = expire;
83 timer_mod(cpu->alarm_timer, expire);
84 } else {
85 timer_del(cpu->alarm_timer);
89 #endif /* CONFIG_USER_ONLY */