mainboard.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <console/console.h>
#include <device/device.h>
#include <option.h>
#include <types.h>
 
/*
 * Hiding the AST2400 might be desirable to reduce attack surface.
 *
 * The PCIe root port that the AST2400 is on is disabled, but the
 * AST2400 itself likely remains in an enabled state.
 *
 * The AST2400 is also attached to the LPC. That interface does not get
 * disabled.
 */
static void hide_ast2400(void)
{
        struct device *dev = pcidev_on_root(0x1c, 0);
        if (!dev)
                return;
 
        /*
         * Marking this device as disabled means that the southbridge code
         * will properly disable the root port when it configures it later.
         */
        dev->enabled = 0;
        printk(BIOS_INFO, "The AST2400 is now set to be hidden.\n");
}
 
static void mainboard_enable(struct device *dev)
{
        if (get_uint_option("hide_ast2400", false))
                hide_ast2400();
}
 
struct chip_operations mainboard_ops = {
        CHIP_NAME("X10SLM+-F")
        .enable_dev = mainboard_enable,
};