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 "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 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