src/soc/amd/common/vboot/transfer_buffer.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <amdblocks/reset.h>
   4 #include <console/cbmem_console.h>
   5 #include <console/console.h>
   6 #include <pc80/mc146818rtc.h>
   7 #include <psp_verstage/psp_transfer.h>
   8 #include <security/vboot/vbnv.h>
   9 #include <security/vboot/symbols.h>
  10 #include <2struct.h>
  11
  12 DECLARE_REGION(cbmemc_transfer)
  13
  14 int transfer_buffer_valid(const struct transfer_info_struct *ptr)
  15 {
  16         if (ptr->magic_val == TRANSFER_MAGIC_VAL && ptr->struct_bytes == sizeof(*ptr))
  17                 return 1;
  18         else
  19                 return 0;
  20 }
  21
  22 void verify_psp_transfer_buf(void)
  23 {
  24         if (*(uint32_t *)_vboot2_work == VB2_SHARED_DATA_MAGIC) {
  25                 cmos_write(0x00, CMOS_RECOVERY_BYTE);
  26                 return;
  27         }
  28
  29         /*
  30          * If CMOS is valid and the system has already been rebooted once, but
  31          * still returns here, instead of rebooting to verstage again, assume
  32          * that the system is in a reboot loop and halt.
  33          */
  34         if ((!vbnv_cmos_failed()) && cmos_read(CMOS_RECOVERY_BYTE) ==
  35                         CMOS_RECOVERY_MAGIC_VAL)
  36                 die("Error: Reboot into recovery was unsuccessful.  Halting.");
  37
  38         printk(BIOS_ERR, "VBOOT workbuf not valid.\n");
  39         printk(BIOS_DEBUG, "Signature: %#08x\n", *(uint32_t *)_vboot2_work);
  40         cmos_init(0);
  41         cmos_write(CMOS_RECOVERY_MAGIC_VAL, CMOS_RECOVERY_BYTE);
  42         warm_reset();
  43 }
  44
  45 void show_psp_transfer_info(void)
  46 {
  47         struct transfer_info_struct *info = (struct transfer_info_struct *)
  48                         (void *)(uintptr_t)_transfer_buffer;
  49
  50         if (transfer_buffer_valid(info)) {
  51                 if ((info->psp_info & PSP_INFO_VALID) == 0) {
  52                         printk(BIOS_INFO, "No PSP info found in transfer buffer.\n");
  53                         return;
  54                 }
  55
  56                 printk(BIOS_INFO, "PSP boot mode: %s\n",
  57                                 info->psp_info & PSP_INFO_PRODUCTION_MODE ?
  58                                 "Production" : "Development");
  59         }
  60 }
  61
  62 void replay_transfer_buffer_cbmemc(void)
  63 {
  64         const struct transfer_info_struct *info = (const struct transfer_info_struct *)
  65                 (void *)(uintptr_t)_transfer_buffer;
  66
  67         void *cbmemc;
  68         size_t cbmemc_size;
  69
  70         if (!transfer_buffer_valid(info))
  71                 return;
  72
  73         if (info->console_offset < sizeof(*info))
  74                 return;
  75
  76         if (info->timestamp_offset <= info->console_offset)
  77                 return;
  78
  79         cbmemc_size = info->timestamp_offset - info->console_offset;
  80
  81         if (info->console_offset + cbmemc_size > info->buffer_size)
  82                 return;
  83
  84         cbmemc = (void *)((uintptr_t)info + info->console_offset);
  85
  86         /* Verify the cbmemc transfer buffer is where we expect it to be. */
  87         if ((void *)_cbmemc_transfer != (void *)cbmemc)
  88                 return;
  89
  90         if (REGION_SIZE(cbmemc_transfer) != cbmemc_size)
  91                 return;
  92
  93         /* We need to manually initialize cbmemc so we can fill the new buffer. cbmemc_init()
  94          * will also be called later in console_hw_init(), but it will be a no-op. */
  95         cbmemc_init();
  96         cbmemc_copy_in(cbmemc, cbmemc_size);
  97 }