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hw/hppa: Add power button emulation 

Emulate a power button switch, tell SeaBIOS the address via fw_cfg and
bind the power button to the qemu UI.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Helge Deller 2020-08-26 17:45:43 +02:00
parent 245760074a
commit b28c4a6497
1 changed files with 32 additions and 0 deletions
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32
hw/hppa/machine.c
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@ -12,6 +12,7 @@
#include "qemu/error-report.h"
#include "sysemu/reset.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
#include "hw/rtc/mc146818rtc.h"
#include "hw/timer/i8254.h"
#include "hw/char/serial.h"
@ -27,6 +28,30 @@
#define MIN_SEABIOS_HPPA_VERSION 1 /* require at least this fw version */
#define HPA_POWER_BUTTON (FIRMWARE_END - 0x10)
static void hppa_powerdown_req(Notifier *n, void *opaque)
{
hwaddr soft_power_reg = HPA_POWER_BUTTON;
uint32_t val;
val = ldl_be_phys(&address_space_memory, soft_power_reg);
if ((val >> 8) == 0) {
/* immediately shut down when under hardware control */
qemu_system_shutdown_request(SHUTDOWN_CAUSE_GUEST_SHUTDOWN);
return;
}
/* clear bit 31 to indicate that the power switch was pressed. */
val &= ~1;
stl_be_phys(&address_space_memory, soft_power_reg, val);
}
static Notifier hppa_system_powerdown_notifier = {
.notify = hppa_powerdown_req
};
static ISABus *hppa_isa_bus(void)
{
ISABus *isa_bus;
@ -86,6 +111,10 @@ static FWCfgState *create_fw_cfg(MachineState *ms)
fw_cfg_add_file(fw_cfg, "/etc/cpu/btlb_entries",
g_memdup(&val, sizeof(val)), sizeof(val));
val = cpu_to_le64(HPA_POWER_BUTTON);
fw_cfg_add_file(fw_cfg, "/etc/power-button-addr",
g_memdup(&val, sizeof(val)), sizeof(val));
fw_cfg_add_i16(fw_cfg, FW_CFG_BOOT_DEVICE, ms->boot_order[0]);
qemu_register_boot_set(fw_cfg_boot_set, fw_cfg);
@ -177,6 +206,9 @@ static void machine_hppa_init(MachineState *machine)
}
}
/* register power switch emulation */
qemu_register_powerdown_notifier(&hppa_system_powerdown_notifier);
/* Load firmware. Given that this is not "real" firmware,
but one explicitly written for the emulation, we might as
well load it directly from an ELF image. */