src/soc/intel/baytrail/refcode.c

/* SPDX-License-Identifier: GPL-2.0-only */

#include <cbmem.h>
#include <console/console.h>
#include <console/streams.h>
#include <cpu/x86/tsc.h>
#include <program_loading.h>
#include <rmodule.h>
#include <stage_cache.h>

#include <soc/ramstage.h>
#include <soc/efi_wrapper.h>

static void ABI_X86 send_to_console(unsigned char b)
{
	console_tx_byte(b);
}

static efi_wrapper_entry_t load_reference_code(void)
{
	if (resume_from_stage_cache()) {
		struct prog prog;
		stage_cache_load_stage(STAGE_REFCODE, &prog);
		return prog_entry(&prog);
	}

	struct prog prog =
		PROG_INIT(PROG_REFCODE, CONFIG_CBFS_PREFIX "/refcode");
	struct rmod_stage_load refcode = {
		.cbmem_id = CBMEM_ID_REFCODE,
		.prog = &prog,
	};

	if (rmodule_stage_load(&refcode)) {
		printk(BIOS_DEBUG, "Error loading reference code.\n");
		return NULL;
	}

	/* Cache loaded reference code. */
	stage_cache_add(STAGE_REFCODE, &prog);

	return prog_entry(&prog);
}

void baytrail_run_reference_code(void)
{
	int ret;
	efi_wrapper_entry_t entry;
	struct efi_wrapper_params wrp = {
		.version = EFI_WRAPPER_VER,
		.console_out = send_to_console,
	};

	entry = load_reference_code();

	if (entry == NULL)
		return;

	wrp.tsc_ticks_per_microsecond = tsc_freq_mhz();

	/* Call into reference code. */
	ret = entry(&wrp);

	if (ret != 0) {
		printk(BIOS_DEBUG, "Reference code returned %d\n", ret);
		return;
	}
}