hw/tpm/tpm_ppi.c

   1 /*
   2  * tpm_ppi.c - TPM Physical Presence Interface
   3  *
   4  * Copyright (C) 2018 IBM Corporation
   5  *
   6  * Authors:
   7  *  Stefan Berger <stefanb@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qemu/osdep.h"
  15
  16 #include "qapi/error.h"
  17 #include "sysemu/memory_mapping.h"
  18 #include "migration/vmstate.h"
  19 #include "hw/qdev-core.h"
  20 #include "hw/acpi/tpm.h"
  21 #include "tpm_ppi.h"
  22 #include "trace.h"
  23
  24 void tpm_ppi_reset(TPMPPI *tpmppi)
  25 {
  26     if (tpmppi->buf[0x15a /* movv, docs/specs/tpm.rst */] & 0x1) {
  27         GuestPhysBlockList guest_phys_blocks;
  28         GuestPhysBlock *block;
  29
  30         guest_phys_blocks_init(&guest_phys_blocks);
  31         guest_phys_blocks_append(&guest_phys_blocks);
  32         QTAILQ_FOREACH(block, &guest_phys_blocks.head, next) {
  33             hwaddr mr_offs = block->host_addr -
  34                              (uint8_t *)memory_region_get_ram_ptr(block->mr);
  35
  36             trace_tpm_ppi_memset(block->host_addr,
  37                                  block->target_end - block->target_start);
  38             memset(block->host_addr, 0,
  39                    block->target_end - block->target_start);
  40             memory_region_set_dirty(block->mr, mr_offs,
  41                                     block->target_end - block->target_start);
  42         }
  43         guest_phys_blocks_free(&guest_phys_blocks);
  44     }
  45 }
  46
  47 void tpm_ppi_init(TPMPPI *tpmppi, MemoryRegion *m,
  48                   hwaddr addr, Object *obj)
  49 {
  50     tpmppi->buf = qemu_memalign(qemu_real_host_page_size,
  51                                 HOST_PAGE_ALIGN(TPM_PPI_ADDR_SIZE));
  52     memory_region_init_ram_device_ptr(&tpmppi->ram, obj, "tpm-ppi",
  53                                       TPM_PPI_ADDR_SIZE, tpmppi->buf);
  54     vmstate_register_ram(&tpmppi->ram, DEVICE(obj));
  55
  56     memory_region_add_subregion(m, addr, &tpmppi->ram);
  57 }