add a VMA list, which holds each virtual memory region of a user-level process

include/metalsvm/vma.h

@@ -0,0 +1,50 @@
+/* 
+ * Copyright 2011 Stefan Lankes, Chair for Operating Systems,
+ *                               RWTH Aachen University
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of MetalSVM.
+ */
+
+#ifndef __VMA_H__
+#define __VMA_H__
+
+#include <metalsvm/stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define VMA_READ	0x01
+#define VMA_WRITE	0x02
+#define VMA_EXECUTE	0x04
+#define VMA_CACHEABLE	0x08
+
+struct vma;
+
+typedef struct vma {
+	size_t start, end;
+	uint32_t type;
+	struct vma* next;
+	struct vma* prev;
+} vma_t;
+
+int vma_add(struct task* task, size_t start, size_t end, uint32_t type);
+int vma_dump(struct task* task);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

mm/Makefile

@@ -1,4 +1,4 @@
-C_source := memory.c
+C_source := memory.c vma.c
 MODULE := mm
 
 include $(TOPDIR)/Makefile.inc

mm/vma.c

@@ -0,0 +1,101 @@
+/* 
+ * Copyright 2011 Stefan Lankes, Chair for Operating Systems,
+ *                               RWTH Aachen University
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of MetalSVM.
+ */
+
+#include <metalsvm/stdlib.h>
+#include <metalsvm/stdio.h>
+#include <metalsvm/tasks_types.h>
+#include <metalsvm/spinlock.h>
+#include <metalsvm/vma.h>
+#include <metalsvm/errno.h>
+
+/*
+ * add a new virtual memory region to the list of VMAs
+ */
+int vma_add(task_t* task, size_t start, size_t end, uint32_t type)
+{
+	vma_t* new_vma;
+	
+	if (BUILTIN_EXPECT(!task || start > end, 0))
+		return -EINVAL;
+
+	new_vma = kmalloc(sizeof(new_vma));
+	if (!new_vma)
+		return -ENOMEM;
+
+	spinlock_lock(&task->vma_lock);
+
+	new_vma->start = start;
+	new_vma->end = end;
+	new_vma->type = type;
+
+	if (!(task->vma_list)) {
+		new_vma->next = new_vma->prev = NULL;
+		task->vma_list = new_vma;
+	} else {
+		vma_t* tmp = task->vma_list;
+
+		while (tmp->next && tmp->start < start)
+			tmp = tmp->next;
+
+		new_vma->next = tmp->next;
+		new_vma->prev = tmp;
+		tmp->next = new_vma;
+	}
+
+	spinlock_unlock(&task->vma_lock);
+
+	return 0;
+}
+
+int vma_dump(task_t* task)
+{
+	vma_t* tmp;
+
+	if (BUILTIN_EXPECT(!task, 0))
+		return -EINVAL;
+
+	spinlock_lock(&task->vma_lock);
+
+	tmp = task->vma_list;
+	while (tmp) {
+		kprintf("%8x - %8x: ", tmp->start, tmp->end);
+
+		if (tmp->type & VMA_READ)
+			kputs("r");
+		else
+			kputs("-");
+
+		if (tmp->type & VMA_WRITE)
+			kputs("w");
+		else
+			kputs("-");
+
+		if (tmp->type & VMA_EXECUTE)
+			kputs("x");
+		else
+			kputs("-");
+		kputs("\n");
+
+		tmp = tmp->next;
+	}
+
+	spinlock_unlock(&task->vma_lock);
+
+	return 0;
+}