u-boot/arch/x86/cpu/coreboot/timestamp.c

/*
 * This file is part of the coreboot project.
 *
 * Copyright (C) 2011 The ChromiumOS Authors.  All rights reserved.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <asm/arch/timestamp.h>
#include <asm/arch/sysinfo.h>
#include <linux/compiler.h>

struct timestamp_entry {
	uint32_t	entry_id;
	uint64_t	entry_stamp;
} __packed;

struct timestamp_table {
	uint64_t	base_time;
	uint32_t	max_entries;
	uint32_t	num_entries;
	struct timestamp_entry entries[0]; /* Variable number of entries */
} __packed;

static struct timestamp_table *ts_table  __attribute__((section(".data")));

void timestamp_init(void)
{
#ifdef CONFIG_SYS_X86_TSC_TIMER
	uint64_t base_time;
#endif

	ts_table = lib_sysinfo.tstamp_table;
#ifdef CONFIG_SYS_X86_TSC_TIMER
	/*
	 * If coreboot is built with CONFIG_COLLECT_TIMESTAMPS, use the value
	 * of base_time in coreboot's timestamp table as our timer base,
	 * otherwise TSC counter value will be used.
	 *
	 * Sometimes even coreboot is built with CONFIG_COLLECT_TIMESTAMPS,
	 * the value of base_time in the timestamp table is still zero, so
	 * we must exclude this case too (this is currently seen on booting
	 * coreboot in qemu)
	 */
	if (ts_table && ts_table->base_time)
		base_time = ts_table->base_time;
	else
		base_time = rdtsc();
	timer_set_base(base_time);
#endif
	timestamp_add_now(TS_U_BOOT_INITTED);
}

void timestamp_add(enum timestamp_id id, uint64_t ts_time)
{
	struct timestamp_entry *tse;

	if (!ts_table || (ts_table->num_entries == ts_table->max_entries))
		return;

	tse = &ts_table->entries[ts_table->num_entries++];
	tse->entry_id = id;
	tse->entry_stamp = ts_time - ts_table->base_time;
}

void timestamp_add_now(enum timestamp_id id)
{
	timestamp_add(id, rdtsc());
}

int timestamp_add_to_bootstage(void)
{
	uint i;

	if (!ts_table)
		return -1;

	for (i = 0; i < ts_table->num_entries; i++) {
		struct timestamp_entry *tse = &ts_table->entries[i];
		const char *name = NULL;

		switch (tse->entry_id) {
		case TS_START_ROMSTAGE:
			name = "start-romstage";
			break;
		case TS_BEFORE_INITRAM:
			name = "before-initram";
			break;
		case TS_DEVICE_INITIALIZE:
			name = "device-initialize";
			break;
		case TS_DEVICE_DONE:
			name = "device-done";
			break;
		case TS_SELFBOOT_JUMP:
			name = "selfboot-jump";
			break;
		}
		if (name) {
			bootstage_add_record(0, name, BOOTSTAGEF_ALLOC,
					     tse->entry_stamp /
							get_tbclk_mhz());
		}
	}

	return 0;
}