LXR qemu/hw/tpm/tpm

   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 "cpu.h"
  18#include "sysemu/memory_mapping.h"
  19#include "sysemu/reset.h"
  20#include "migration/vmstate.h"
  21#include "tpm_ppi.h"
  22#include "trace.h"
  23
  24void tpm_ppi_reset(TPMPPI *tpmppi)
  25{
  26    if (tpmppi->buf[0x15a /* movv, docs/specs/tpm.txt */] & 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            trace_tpm_ppi_memset(block->host_addr,
  34                                 block->target_end - block->target_start);
  35            memset(block->host_addr, 0,
  36                   block->target_end - block->target_start);
  37            memory_region_set_dirty(block->mr, 0,
  38                                    block->target_end - block->target_start);
  39        }
  40        guest_phys_blocks_free(&guest_phys_blocks);
  41    }
  42}
  43
  44void tpm_ppi_init(TPMPPI *tpmppi, struct MemoryRegion *m,
  45                  hwaddr addr, Object *obj)
  46{
  47    tpmppi->buf = g_malloc0(HOST_PAGE_ALIGN(TPM_PPI_ADDR_SIZE));
  48    memory_region_init_ram_device_ptr(&tpmppi->ram, obj, "tpm-ppi",
  49                                      TPM_PPI_ADDR_SIZE, tpmppi->buf);
  50    vmstate_register_ram(&tpmppi->ram, DEVICE(obj));
  51
  52    memory_region_add_subregion(m, addr, &tpmppi->ram);
  53}
  54