devman initial implementation

src/sys/devman.c

@@ -0,0 +1,72 @@
+#include <kernel/devman.h>
+#include <kernel/vfs.h>
+#include <kernel/devfs.h>
+#include <stdio.h>
+#include <kernel/alloc.h>
+#include <sys/sysmacros.h>
+#include <arch/panic.h>
+#include <sys/stat.h>
+
+static devcalls** majorcalls;
+static size_t highestmajor = 0;
+
+int devman_newdevice(char* name, int type, int major, int minor, devcalls* calls){
+	
+	if(major > highestmajor){
+		void* addr = realloc(majorcalls, major*sizeof(devcalls*)+1);
+		if(!addr)
+			return ENOMEM;
+		majorcalls = addr;
+	}
+	
+	majorcalls[major] = calls;
+
+	return devfs_newdevice(name, type, makedev(major, minor), 0777);
+	
+}
+
+int devman_write(int *error, int dev, void* buff, size_t count, size_t offset){
+	
+	if(major(dev) > highestmajor)
+		return ENODEV;
+	
+
+	return majorcalls[major(dev)]->write(error, minor(dev), buff, count, offset);
+	
+	
+}
+
+int devman_read(int *error, int dev, void* buff, size_t count, size_t offset){
+	
+	if(major(dev) > highestmajor)
+		return ENODEV;
+	
+
+	return majorcalls[major(dev)]->read(error, minor(dev), buff, count, offset);
+
+
+}
+
+void devman_init(){
+	
+	devfs_init();
+
+	size_t err = vfs_mkdir(vfs_root(), "dev", 0777);
+	if(err && err != EEXIST){
+		printf("Failed to mkdir /dev: %lu\n", err);
+		_panic("Devman initialization failed", 0);
+	}
+
+	err = vfs_mount(vfs_root(), NULL, "dev", "devfs", 0, NULL);
+
+	if(err){
+		printf("Failed to mount devfs in /dev: %lu\n", err);
+		_panic("Devman initialization failed", 0);
+	}
+	
+	printf("devfs mounted in /dev\n");
+
+	majorcalls = alloc(sizeof(devcalls*));
+
+
+}

src/sys/mm/alloc.c

@@ -1,5 +1,6 @@
 #include <kernel/alloc.h>
 #include <kernel/slab.h>
+#include <string.h>
 
 void* alloc(size_t size){
 	return slab_alloc(size);
@@ -12,3 +13,16 @@ void free(void* addr){
 void alloc_init(){
 	slab_init();
 }
+
+void* realloc(void* addr, size_t size){
+	void* tmp = alloc(size);
+	if(!tmp)
+		return NULL;
+	
+	memcpy(tmp, addr, size);
+
+	free(addr);
+	
+	return tmp;
+
+}