rename common to src

+ I keep starting to type src and wondering why autocomplete won't work,
  I guess src is just uncounciously a better name

1 files changed, 115 insertions, 0 deletions

diff --git a/src/uapi/conf.c b/src/uapi/conf.c
new file mode 100644
index 0000000..894b98a
--- /dev/null
+++ b/src/uapi/conf.c
@@ -0,0 +1,115 @@
+/* SPDX-License-Identifier: copyleft-next-0.3.1 */
+/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
+
+/**
+ * @file conf.c
+ * Runtime configuration sycall implementations.
+ *
+ * At the moment there are not runtime configuration parameters.
+ */
+
+#include <kmi/power.h>
+#include <kmi/sizes.h>
+#include <kmi/uapi.h>
+#include <kmi/conf.h>
+
+#include <arch/proc.h>
+
+/** \todo stack size should really be set on a per-thread basis, and are the
+ * conf*-syscalls even necessary? */
+size_t __thread_stack_size = SZ_2M;
+size_t __rpc_stack_size = SZ_512K;
+
+/** IDs for configuration parameters. */
+/** @todo should probably be moved somewhere so it can be shared with userspace */
+enum conf_param {
+	CONF_THREAD_STACK = 0,
+	CONF_RPC_STACK,
+};
+
+/**
+ * Configuration parameter read syscall handler.
+ *
+ * \todo Implement parameters.
+ *
+ * @param t Current tcb.
+ * @param param Parameter to read.
+ * @return \ref OK and parameter value.
+ */
+SYSCALL_DEFINE1(conf_get)(struct tcb *t, sys_arg_t param)
+{
+	if (!has_cap(t->caps, CAP_CONF))
+		return_args1(t, ERR_PERM);
+
+	long val = 0;
+	switch (param) {
+	case CONF_THREAD_STACK:
+		val = __thread_stack_size;
+		break;
+
+	case CONF_RPC_STACK:
+		val = __rpc_stack_size;
+		break;
+
+	default:
+		return_args1(t, ERR_NF);
+	}
+
+	return_args2(t, OK, val);
+}
+
+/**
+ * Configuration parameter write syscall handler.
+ *
+ * \todo Implement parameters.
+ *
+ * @param t Current tcb.
+ * @param param Parameter to write.
+ * @param val Value to set \c param to.
+ * @return \ref OK and \c 0.
+ */
+SYSCALL_DEFINE2(conf_set)(struct tcb *t, sys_arg_t param, sys_arg_t val)
+{
+	if (!has_cap(t->caps, CAP_CONF))
+		return_args1(t, ERR_PERM);
+
+	size_t size = 0;
+	switch (param) {
+	case CONF_THREAD_STACK:
+		__thread_stack_size = align_up(val, BASE_PAGE_SIZE);
+		break;
+
+	case CONF_RPC_STACK:
+		size = align_up(val, BASE_PAGE_SIZE);
+		if (size > max_rpc_size())
+			return_args1(t, ERR_MISC);
+
+		__rpc_stack_size = size;
+		break;
+	}
+
+	return_args1(t, OK);
+}
+
+/**
+ * Poweroff syscall handler.
+ *
+ * @param t Current tcb.
+ * @param type Type of poweroff.
+ * @return \ref ERR_INVAL and \c 0 if incorrect poweroff \c type give, otherwise
+ * does not return.
+ */
+SYSCALL_DEFINE1(poweroff)(struct tcb *t, sys_arg_t type)
+{
+	if (!(has_cap(t->caps, CAP_POWER)))
+		return_args1(t, ERR_PERM);
+
+	switch (type) {
+	case SHUTDOWN:
+	case COLD_REBOOT:
+	case WARM_REBOOT:
+		return_args2(t, OK, poweroff(type));
+	};
+
+	return_args1(t, ERR_INVAL);
+}