transfer_buffer.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <amdblocks/reset.h>
#include <console/cbmem_console.h>
#include <console/console.h>
#include <pc80/mc146818rtc.h>
#include <security/vboot/vbnv.h>
#include <security/vboot/symbols.h>
#include <soc/psp_transfer.h>
#include <timestamp.h>
#include <2struct.h>
 
DECLARE_REGION(cbmemc_transfer)
 
int transfer_buffer_valid(const struct transfer_info_struct *ptr)
{
        if (ptr->magic_val == TRANSFER_MAGIC_VAL && ptr->struct_bytes == sizeof(*ptr))
                return 1;
        else
                return 0;
}
 
void verify_psp_transfer_buf(void)
{
        if (*(uint32_t *)_vboot2_work == VB2_SHARED_DATA_MAGIC) {
                cmos_write(0x00, CMOS_RECOVERY_BYTE);
                return;
        }
 
        /*
         * If CMOS is valid and the system has already been rebooted once, but
         * still returns here, instead of rebooting to verstage again, assume
         * that the system is in a reboot loop and halt.
         */
        if ((!vbnv_cmos_failed()) && cmos_read(CMOS_RECOVERY_BYTE) ==
                        CMOS_RECOVERY_MAGIC_VAL)
                die("Error: Reboot into recovery was unsuccessful.  Halting.");
 
        printk(BIOS_ERR, "VBOOT workbuf not valid.\n");
        printk(BIOS_DEBUG, "Signature: %#08x\n", *(uint32_t *)_vboot2_work);
        cmos_init(0);
        cmos_write(CMOS_RECOVERY_MAGIC_VAL, CMOS_RECOVERY_BYTE);
        warm_reset();
}
 
void show_psp_transfer_info(void)
{
        struct transfer_info_struct *info = (struct transfer_info_struct *)
                        (void *)(uintptr_t)_transfer_buffer;
 
        if (transfer_buffer_valid(info)) {
                if ((info->psp_info & PSP_INFO_VALID) == 0) {
                        printk(BIOS_INFO, "No PSP info found in transfer buffer.\n");
                        return;
                }
 
                printk(BIOS_INFO, "PSP boot mode: %s\n",
                                info->psp_info & PSP_INFO_PRODUCTION_MODE ?
                                "Production" : "Development");
                printk(BIOS_INFO, "Silicon level: %s\n",
                                info->psp_info & PSP_INFO_PRODUCTION_SILICON ?
                                "Production" : "Pre-Production");
        }
}
 
void replay_transfer_buffer_cbmemc(void)
{
        const struct transfer_info_struct *info = (const struct transfer_info_struct *)
                (void *)(uintptr_t)_transfer_buffer;
 
        void *cbmemc;
        size_t cbmemc_size;
 
        if (!transfer_buffer_valid(info))
                return;
 
        if (info->console_offset < sizeof(*info))
                return;
 
        if (info->timestamp_offset <= info->console_offset)
                return;
 
        cbmemc_size = info->timestamp_offset - info->console_offset;
 
        if (info->console_offset + cbmemc_size > info->buffer_size)
                return;
 
        cbmemc = (void *)((uintptr_t)info + info->console_offset);
 
        /* Verify the cbmemc transfer buffer is where we expect it to be. */
        if ((void *)_cbmemc_transfer != (void *)cbmemc)
                return;
 
        if (REGION_SIZE(cbmemc_transfer) != cbmemc_size)
                return;
 
        /* We need to manually initialize cbmemc so we can fill the new buffer. cbmemc_init()
         * will also be called later in console_hw_init(), but it will be a no-op. */
        cbmemc_init();
        cbmemc_copy_in(cbmemc, cbmemc_size);
}