debug_feature.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <intelbasecode/debug_feature.h>
#include <console/console.h>
#include <spi_flash.h>
 
#define SI_DESC_OEM_SECTION_OFFSET      0xF00
#define PRE_MEM_FEATURE_CTRL_OFFSET     SI_DESC_OEM_SECTION_OFFSET
#define PRE_MEM_FEATURE_CTRL_SZ         64
#define SI_DESC_REGION_SZ               4096
 
struct pre_mem_ft {
        uint8_t cse_fw_update_disable; /* Byte location: 0xF00 */
        uint8_t reserved[63];
};
 
static struct pre_mem_ft pre_mem_debug;
 
_Static_assert(sizeof(struct pre_mem_ft) % 64 == 0 && sizeof(struct pre_mem_ft) <= 256,
                "sizeof(struct pre_mem_ft) must be a multiple of 64 bytes and up to 256 bytes");
 
bool is_debug_cse_fw_update_disable(void)
{
        printk(BIOS_DEBUG, "rt_debug: pre_mem_debug.cse_fw_update_disable=%d\n",
                        pre_mem_debug.cse_fw_update_disable);
 
        return pre_mem_debug.cse_fw_update_disable == 1;
}
 
uint8_t pre_mem_debug_init(void)
{
        if (spi_flash_read(boot_device_spi_flash(), PRE_MEM_FEATURE_CTRL_OFFSET,
                                PRE_MEM_FEATURE_CTRL_SZ, &pre_mem_debug)) {
                printk(BIOS_ERR, "Failed to read Descriptor Region from SPI Flash\n");
                return 1;
        }
        return 0;
}