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target/hppa: Implement the interval timer

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Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2017-12-28 17:50:14 -08:00
parent 4f5f254808
commit 49c29d6c2e
6 changed files with 67 additions and 4 deletions
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36
target/hppa/op_helper.c
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@ -22,6 +22,8 @@
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
#include "qemu/timer.h"
void QEMU_NORETURN HELPER(excp)(CPUHPPAState *env, int excp)
{
@ -602,7 +604,41 @@ float64 HELPER(fmpynfadd_d)(CPUHPPAState *env, float64 a, float64 b, float64 c)
return ret;
}
target_ureg HELPER(read_interval_timer)(void)
{
#ifdef CONFIG_USER_ONLY
/* In user-mode, QEMU_CLOCK_VIRTUAL doesn't exist.
Just pass through the host cpu clock ticks. */
return cpu_get_host_ticks();
#else
/* In system mode we have access to a decent high-resolution clock.
In order to make OS-level time accounting work with the cr16,
present it with a well-timed clock fixed at 250MHz. */
return qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) >> 2;
#endif
}
#ifndef CONFIG_USER_ONLY
void HELPER(write_interval_timer)(CPUHPPAState *env, target_ureg val)
{
HPPACPU *cpu = hppa_env_get_cpu(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);
}
target_ureg HELPER(swap_system_mask)(CPUHPPAState *env, target_ureg nsm)
{
target_ulong psw = env->psw;