| 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 "system/memory_mapping.h" |
| 18 | #include "migration/vmstate.h" |
| 19 | #include "hw/core/qdev.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 | } |