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/*
* Helpers for HPPA system instructions.
*
* Copyright (c) 2016 Richard Henderson <rth@twiddle.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "cpu.h"
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "qemu/timer.h"
#include "sysemu/runstate.h"
#include "sysemu/sysemu.h"
#include "chardev/char-fe.h"
void HELPER(write_interval_timer)(CPUHPPAState *env, target_ulong val)
{
HPPACPU *cpu = env_archcpu(env);
uint64_t current = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
uint64_t timeout;
/*
* Even in 64-bit mode, the comparator is always 32-bit. But the
* value we expose to the guest is 1/4 of the speed of the clock,
* so moosh in 34 bits.
*/
timeout = deposit64(current, 0, 34, (uint64_t)val << 2);
/* If the mooshing puts the clock in the past, advance to next round. */
if (timeout < current + 1000) {
timeout += 1ULL << 34;
}
cpu->env.cr[CR_IT] = timeout;
timer_mod(cpu->alarm_timer, timeout);
}
void HELPER(halt)(CPUHPPAState *env)
{
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
helper_excp(env, EXCP_HLT);
}
void HELPER(reset)(CPUHPPAState *env)
{
qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
helper_excp(env, EXCP_HLT);
}
target_ulong HELPER(swap_system_mask)(CPUHPPAState *env, target_ulong nsm)
{
target_ulong psw = env->psw;
/*
* Setting the PSW Q bit to 1, if it was not already 1, is an
* undefined operation.
*
* However, HP-UX 10.20 does this with the SSM instruction.
* Tested this on HP9000/712 and HP9000/785/C3750 and both
* machines set the Q bit from 0 to 1 without an exception,
* so let this go without comment.
*/
env->psw = (psw & ~PSW_SM) | (nsm & PSW_SM);
return psw & PSW_SM;
}
void HELPER(rfi)(CPUHPPAState *env)
{
uint64_t mask;
cpu_hppa_put_psw(env, env->cr[CR_IPSW]);
/*
* For pa2.0, IIASQ is the top bits of the virtual address.
* To recreate the space identifier, remove the offset bits.
* For pa1.x, the mask reduces to no change to space.
*/
mask = gva_offset_mask(env->psw);
env->iaoq_f = env->cr[CR_IIAOQ];
env->iaoq_b = env->cr_back[1];
env->iasq_f = (env->cr[CR_IIASQ] << 32) & ~(env->iaoq_f & mask);
env->iasq_b = (env->cr_back[0] << 32) & ~(env->iaoq_b & mask);
if (qemu_loglevel_mask(CPU_LOG_INT)) {
FILE *logfile = qemu_log_trylock();
if (logfile) {
CPUState *cs = env_cpu(env);
fprintf(logfile, "RFI: cpu %d\n", cs->cpu_index);
hppa_cpu_dump_state(cs, logfile, 0);
qemu_log_unlock(logfile);
}
}
}
static void getshadowregs(CPUHPPAState *env)
{
env->gr[1] = env->shadow[0];
env->gr[8] = env->shadow[1];
env->gr[9] = env->shadow[2];
env->gr[16] = env->shadow[3];
env->gr[17] = env->shadow[4];
env->gr[24] = env->shadow[5];
env->gr[25] = env->shadow[6];
}
void HELPER(rfi_r)(CPUHPPAState *env)
{
getshadowregs(env);
helper_rfi(env);
}
#ifndef CONFIG_USER_ONLY
/*
* diag_console_output() is a helper function used during the initial bootup
* process of the SeaBIOS-hppa firmware. During the bootup phase, addresses of
* serial ports on e.g. PCI busses are unknown and most other devices haven't
* been initialized and configured yet. With help of a simple "diag" assembler
* instruction and an ASCII character code in register %r26 firmware can easily
* print debug output without any dependencies to the first serial port and use
* that as serial console.
*/
void HELPER(diag_console_output)(CPUHPPAState *env)
{
CharBackend *serial_backend;
Chardev *serial_port;
unsigned char c;
/* find first serial port */
serial_port = serial_hd(0);
if (!serial_port) {
return;
}
/* get serial_backend for the serial port */
serial_backend = serial_port->be;
if (!serial_backend ||
!qemu_chr_fe_backend_connected(serial_backend)) {
return;
}
c = (unsigned char)env->gr[26];
qemu_chr_fe_write(serial_backend, &c, sizeof(c));
}
#endif
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