Implement userspace malloc

2 files changed, 39 insertions, 0 deletions

diff --git a/src/lib/include/syscall.h b/src/lib/include/syscall.h
index 44b88cf..e0f08eb 100644
--- a/src/lib/include/syscall.h
+++ b/src/lib/include/syscall.h
@@ -5,6 +5,7 @@
 #include <stdbool.h>
 
 #include <syscallproto.h>
+#include <mmap.h>
 
 #include <fs.h>
 #include <debug.h>
@@ -13,6 +14,10 @@ void dbg_print(const char* str);
 void yield();
 void exit(int code);
 
+bool mmap(void* addr, size_t size, int mode);
+bool mchmap(void* addr, int mode);
+bool munmap(void* addr);
+
 // more todo
 
 /* vim: set ts=4 sw=4 tw=0 noet :*/
diff --git a/src/lib/include/user_region.h b/src/lib/include/user_region.h
new file mode 100644
index 0000000..8a4c490
--- /dev/null
+++ b/src/lib/include/user_region.h
@@ -0,0 +1,34 @@
+#pragma once
+
+// User virtual memory region allocator
+
+// This is entirely thread-safe
+
+#include <stdint.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#include <syscall.h>
+
+#define PAGE_SIZE		0x1000
+#define PAGE_MASK		0xFFFFF000
+#define PAGE_ALIGN_DOWN(x)	(((size_t)x) & PAGE_MASK) 
+#define PAGE_ALIGN_UP(x)  	((((size_t)x)&(~PAGE_MASK)) == 0 ? ((size_t)x) : (((size_t)x) & PAGE_MASK) + PAGE_SIZE)
+
+struct region_info;
+
+typedef struct region_info {
+	void* addr;
+	size_t size;
+	char* type;
+} region_info_t;
+
+void region_allocator_init(void* begin, void* end);
+
+void* region_alloc(size_t size, char* type);	// returns 0 on error
+region_info_t *find_region(void* addr);
+void region_free(void* addr);
+
+void dbg_print_region_info();
+
+/* vim: set ts=4 sw=4 tw=0 noet :*/