1 files changed, 108 insertions, 0 deletions
diff --git a/sys/dev/hwt/hwt_config.c b/sys/dev/hwt/hwt_config.c
new file mode 100644
index 000000000000..30688e7fc76b
--- /dev/null
+++ b/sys/dev/hwt/hwt_config.c
@@ -0,0 +1,108 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023-2025 Ruslan Bukin <br@bsdpad.com>
+ *
+ * This work was supported by Innovate UK project 105694, "Digital Security
+ * by Design (DSbD) Technology Platform Prototype".
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/proc.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/mutex.h>
+#include <sys/lock.h>
+#include <sys/hwt.h>
+
+#include <vm/vm.h>
+
+#include <dev/hwt/hwt_hook.h>
+#include <dev/hwt/hwt_context.h>
+#include <dev/hwt/hwt_contexthash.h>
+#include <dev/hwt/hwt_config.h>
+#include <dev/hwt/hwt_thread.h>
+#include <dev/hwt/hwt_record.h>
+
+#define	HWT_MAXCONFIGSIZE	PAGE_SIZE
+
+#define	HWT_CONFIG_DEBUG
+#undef	HWT_CONFIG_DEBUG
+
+#ifdef	HWT_CONFIG_DEBUG
+#define	dprintf(fmt, ...)	printf(fmt, ##__VA_ARGS__)
+#else
+#define	dprintf(fmt, ...)
+#endif
+
+static MALLOC_DEFINE(M_HWT_CONFIG, "hwt_config", "HWT config");
+
+int
+hwt_config_set(struct thread *td, struct hwt_context *ctx,
+    struct hwt_set_config *sconf)
+{
+	size_t config_size;
+	void *old_config;
+	void *config;
+	int error;
+
+	config_size = sconf->config_size;
+	if (config_size == 0)
+		return (0);
+
+	if (config_size > HWT_MAXCONFIGSIZE)
+		return (EFBIG);
+
+	config = malloc(config_size, M_HWT_CONFIG, M_WAITOK | M_ZERO);
+
+	error = copyin(sconf->config, config, config_size);
+	if (error) {
+		free(config, M_HWT_CONFIG);
+		return (error);
+	}
+
+	HWT_CTX_LOCK(ctx);
+	old_config = ctx->config;
+	ctx->config = config;
+	ctx->config_size = sconf->config_size;
+	ctx->config_version = sconf->config_version;
+	HWT_CTX_UNLOCK(ctx);
+
+	if (old_config != NULL)
+		free(old_config, M_HWT_CONFIG);
+
+	return (error);
+}
+
+void
+hwt_config_free(struct hwt_context *ctx)
+{
+
+	if (ctx->config == NULL)
+		return;
+
+	free(ctx->config, M_HWT_CONFIG);
+
+	ctx->config = NULL;
+}