lib/efi_loader/efi_timestamp.c

// SPDX-License-Identifier: BSD-3-Clause
//
// Copyright 2025 Google LLC

#include <common.h>
#include <efi_loader.h>
#include <malloc.h>

#define EFI_TIMESTAMP_PROTOCOL_GUID                                        \
	EFI_GUID(0xafbfde41, 0x2e6e, 0x4262, 0xba, 0x65, 0x62, 0xb9, 0x23, \
		 0x6e, 0x54, 0x95)

static const efi_guid_t efi_timestamp_guid = EFI_TIMESTAMP_PROTOCOL_GUID;

typedef struct {
	uint64_t frequency;
	uint64_t end_value;
} efi_timestamp_properties_t;

struct efi_timestamp {
	uint64_t (*get_timestamp)(void);
	efi_status_t (*get_properties)(efi_timestamp_properties_t *);
};

static uint64_t get_timestamp(void)
{
	return get_timer(0);
}

static efi_status_t get_properties(efi_timestamp_properties_t *out)
{
	if (!out) {
		return EFI_INVALID_PARAMETER;
	}
	out->frequency = CONFIG_SYS_HZ;
	out->end_value = (unsigned long)-1;
	return EFI_SUCCESS;
}

static struct efi_timestamp protocol = {
	.get_timestamp = get_timestamp,
	.get_properties = get_properties,
};

static efi_handle_t handle = NULL;

efi_status_t efi_timestamp_register(void)
{
	if (handle) {
		return EFI_ALREADY_STARTED;
	}

	return efi_install_multiple_protocol_interfaces(
		&handle, &efi_timestamp_guid, &protocol, NULL);
}