qemu

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
#include "qemu/memalign.h"
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
    size_t host_page_size = qemu_real_host_page_size();
51

52
    tpmppi->buf = qemu_memalign(host_page_size,
53
                                ROUND_UP(TPM_PPI_ADDR_SIZE, host_page_size));
54
    memory_region_init_ram_device_ptr(&tpmppi->ram, obj, "tpm-ppi",
55
                                      TPM_PPI_ADDR_SIZE, tpmppi->buf);
56
    vmstate_register_ram(&tpmppi->ram, DEVICE(obj));
57

58
    memory_region_add_subregion(m, addr, &tpmppi->ram);
59
}
60