1 files changed, 59 insertions, 0 deletions
diff --git a/hw/tpm/tpm_ppi.c b/hw/tpm/tpm_ppi.c
new file mode 100644
index 0000000000..f27ed6c35e
--- /dev/null
+++ b/hw/tpm/tpm_ppi.c
@@ -0,0 +1,59 @@
+/*
+ * 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)
+{
+    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);
+}