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target/hppa: Implement halt and reset instructions

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Real hardware would use an external device to control the power.
But for the moment let's invent instructions in reserved space,
to be used by our custom firmware.

Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Helge Deller 2017-12-28 22:04:57 -08:00 committed by Richard Henderson
parent e216a77e3b
commit 6210db057a
3 changed files with 39 additions and 1 deletions
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2
target/hppa/helper.h
View File

@ -80,6 +80,8 @@ DEF_HELPER_FLAGS_4(fmpynfadd_d, TCG_CALL_NO_RWG, i64, env, i64, i64, i64)
DEF_HELPER_FLAGS_0(read_interval_timer, TCG_CALL_NO_RWG, tr)
#ifndef CONFIG_USER_ONLY
DEF_HELPER_1(halt, noreturn, env)
DEF_HELPER_1(reset, noreturn, env)
DEF_HELPER_1(rfi, void, env)
DEF_HELPER_1(rfi_r, void, env)
DEF_HELPER_FLAGS_2(write_interval_timer, TCG_CALL_NO_RWG, void, env, tr)

13
target/hppa/op_helper.c
View File

@ -22,6 +22,7 @@
#include "exec/exec-all.h"
#include "exec/helper-proto.h"
#include "exec/cpu_ldst.h"
#include "sysemu/sysemu.h"
#include "qemu/timer.h"
@ -639,6 +640,18 @@ void HELPER(write_interval_timer)(CPUHPPAState *env, target_ureg val)
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_ureg HELPER(swap_system_mask)(CPUHPPAState *env, target_ureg nsm)
{
target_ulong psw = env->psw;

25
target/hppa/translate.c
View File

@ -2302,6 +2302,18 @@ static DisasJumpType trans_rfi(DisasContext *ctx, uint32_t insn,
/* Exit the TB to recognize new interrupts. */
return nullify_end(ctx, DISAS_NORETURN);
}
static DisasJumpType gen_hlt(DisasContext *ctx, int reset)
{
CHECK_MOST_PRIVILEGED(EXCP_PRIV_OPR);
nullify_over(ctx);
if (reset) {
gen_helper_reset(cpu_env);
} else {
gen_helper_halt(cpu_env);
}
return nullify_end(ctx, DISAS_NORETURN);
}
#endif /* !CONFIG_USER_ONLY */
static const DisasInsn table_system[] = {
@ -4519,7 +4531,18 @@ static DisasJumpType translate_one(DisasContext *ctx, uint32_t insn)
case 0x15: /* unassigned */
case 0x1D: /* unassigned */
case 0x37: /* unassigned */
case 0x3F: /* unassigned */
break;
case 0x3F:
#ifndef CONFIG_USER_ONLY
/* Unassigned, but use as system-halt. */
if (insn == 0xfffdead0) {
return gen_hlt(ctx, 0); /* halt system */
}
if (insn == 0xfffdead1) {
return gen_hlt(ctx, 1); /* reset system */
}
#endif
break;
default:
break;
}