target/hppa/sys_helper.c

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