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/*
* 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 "qemu/memalign.h"
#include "qapi/error.h"
#include "system/memory_mapping.h"
#include "migration/vmstate.h"
#include "hw/qdev-core.h"
#include "hw/acpi/tpm.h"
#include "tpm_ppi.h"
#include "trace.h"
void tpm_ppi_reset(TPMPPI *tpmppi)
{
if (tpmppi->buf[0x15a /* movv, docs/specs/tpm.rst */] & 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) {
hwaddr mr_offs = block->host_addr -
(uint8_t *)memory_region_get_ram_ptr(block->mr);
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, mr_offs,
block->target_end - block->target_start);
}
guest_phys_blocks_free(&guest_phys_blocks);
}
}
void tpm_ppi_init(TPMPPI *tpmppi, MemoryRegion *m,
hwaddr addr, Object *obj)
{
size_t host_page_size = qemu_real_host_page_size();
tpmppi->buf = qemu_memalign(host_page_size,
ROUND_UP(TPM_PPI_ADDR_SIZE, host_page_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);
}
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