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 "migration/vmstate.h"
  20#include "hw/acpi/tpm.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.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
  47void tpm_ppi_init(TPMPPI *tpmppi, struct 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}
  58