text: /*
   * tpm_ppi.c - TPM Physical Presence Interface
   *
   * Copyright (C) 2018 IBM Corporation
   *
   * Authors:
   *  Stefan Berger <stefanb@us.ibm.com>
   *
   * This work is licensed under the terms of the GNU GPL, version 2 or later.
   * See the COPYING file in the top-level directory.
   *
   */
  
  #include "qemu/osdep.h"
  
  #include "qapi/error.h"
  #include "cpu.h"
  #include "sysemu/memory_mapping.h"
  #include "sysemu/reset.h"
  #include "migration/vmstate.h"
  #include "tpm_ppi.h"
  #include "trace.h"
  
  void tpm_ppi_reset(TPMPPI *tpmppi)
  {
      if (tpmppi->buf[0x15a /* movv, docs/specs/tpm.txt */] & 0x1) {
          GuestPhysBlockList guest_phys_blocks;
          GuestPhysBlock *block;
  
          guest_phys_blocks_init(&guest_phys_blocks);
          guest_phys_blocks_append(&guest_phys_blocks);
          QTAILQ_FOREACH(block, &guest_phys_blocks.head, next) {
              trace_tpm_ppi_memset(block->host_addr,
                                   block->target_end - block->target_start);
              memset(block->host_addr, 0,
                     block->target_end - block->target_start);
              memory_region_set_dirty(block->mr, 0,
                                      block->target_end - block->target_start);
          }
          guest_phys_blocks_free(&guest_phys_blocks);
      }
  }
  
  void tpm_ppi_init(TPMPPI *tpmppi, struct MemoryRegion *m,
                    hwaddr addr, Object *obj)
  {
      tpmppi->buf = g_malloc0(HOST_PAGE_ALIGN(TPM_PPI_ADDR_SIZE));
      memory_region_init_ram_device_ptr(&tpmppi->ram, obj, "tpm-ppi",
                                        TPM_PPI_ADDR_SIZE, tpmppi->buf);
      vmstate_register_ram(&tpmppi->ram, DEVICE(obj));
  
      memory_region_add_subregion(m, addr, &tpmppi->ram);
  }
  