/* * 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 "sysemu/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) { tpmppi->buf = qemu_memalign(qemu_real_host_page_size(), HOST_PAGE_ALIGN(TPM_PPI_ADDR_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); }