refcode.c

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/* 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;
        }
}