Added devfs and basic standard devices

4 files changed, 141 insertions, 0 deletions

diff --git a/src/kernel/fs/dev.c b/src/kernel/fs/dev.c
new file mode 100644
index 0000000..968dcfe
--- /dev/null
+++ b/src/kernel/fs/dev.c
@@ -0,0 +1,114 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <kernel/system.h>
+#include <kernel/fs/dev.h>
+#include <kernel/fs/vfs.h>
+#include <kernel/fs/ext2.h>
+#include <kernel/memory/alloc.h>
+#include <kernel/lib/stdlib.h>
+#include <kernel/lib/stdio.h>
+
+void dev_make(char *name, read read, write write)
+{
+	struct fs_node *dev_node = (struct fs_node *)kmalloc(sizeof(struct fs_node));
+	strcpy(dev_node->name, "/dev");
+	ext2_root->open(dev_node);
+
+	if (dev_node->inode == 0) {
+		warn("Can't make device, no path for /dev");
+		return;
+	}
+
+	ext2_root->close(dev_node);
+
+	char *path = (char *)kmalloc(strlen(name) + strlen("/dev/") + 2);
+	strcpy(path, "/dev/");
+	strcpy(&path[strlen("/dev/")], name);
+
+	// TODO: Touch dev files in the vfs instead of opening it via ext2
+	struct fs_node *node = (struct fs_node *)kmalloc(sizeof(struct fs_node));
+	strcpy(node->name, path);
+	ext2_root->open(node);
+	kfree(path);
+
+	if (node->inode == 0) {
+		warn("Couldn't resolve path");
+		return;
+	}
+
+	node->read = read;
+	node->write = write;
+
+	node->dev = (struct dev *)kmalloc(sizeof(struct dev));
+	node->dev->read = read;
+	node->dev->write = write;
+	node->dev->block_size = 512;
+}
+
+uint32_t dev_read(struct fs_node *dev, uint32_t offset, uint32_t size, char *buffer)
+{
+	if (dev->read == NULL) {
+		warn("Can't read from device");
+		return (uint32_t)-1;
+	}
+
+	return dev->read(dev, offset, size, buffer);
+}
+
+uint32_t dev_write(struct fs_node *dev, uint32_t offset, uint32_t size, char *buffer)
+{
+	if (dev->write == NULL) {
+		warn("Can't write to device");
+		return (uint32_t)-1;
+	}
+
+	return dev->write(dev, offset, size, buffer);
+}
+
+// Standard devices
+
+uint32_t stdin_read(struct fs_node *node, uint32_t offset, uint32_t size, uint8_t *buffer)
+{
+	// Do something
+	return 0;
+}
+
+void dev_stdin()
+{
+	dev_make("stdout", (read)stdin_read, NULL);
+	struct fs_node *node = (struct fs_node *)kmalloc(sizeof(struct fs_node));
+	strcpy(node->name, "/dev/stdin");
+	ext2_root->open(node);
+	node->dev->block_size = 0;
+	node->length = 0xFFFFFFFF;
+}
+
+uint32_t stdout_write(struct fs_node *node, uint32_t offset, uint32_t size, uint8_t *buffer)
+{
+	//putch(*buffer);
+	return 0;
+}
+
+void dev_stdout()
+{
+	dev_make("stdout", NULL, (write)stdout_write);
+	struct fs_node *node = (struct fs_node *)kmalloc(sizeof(struct fs_node));
+	strcpy(node->name, "/dev/stdout");
+	ext2_root->open(node);
+	node->dev->block_size = 0;
+}
+
+uint32_t stderr_write(struct fs_node *node, uint32_t offset, uint32_t size, uint8_t *buffer)
+{
+	//putch(*buffer);
+	return 0;
+}
+
+void dev_stderr()
+{
+	dev_make("stderr", NULL, (write)stderr_write);
+	struct fs_node *node = (struct fs_node *)kmalloc(sizeof(struct fs_node));
+	strcpy(node->name, "/dev/stderr");
+	ext2_root->open(node);
+	node->dev->block_size = 0;
+}
\ No newline at end of file
diff --git a/src/kernel/fs/dev.h b/src/kernel/fs/dev.h
new file mode 100644
index 0000000..40263e6
--- /dev/null
+++ b/src/kernel/fs/dev.h
@@ -0,0 +1,25 @@
+#ifndef MELVIX_DEV_H
+#define MELVIX_DEV_H
+
+#include <stdint.h>
+#include <kernel/fs/vfs.h>
+
+struct dev {
+	char name[128];
+	uint32_t block_size;
+	read read;
+	write write;
+
+	uint8_t bus;
+	uint8_t drive;
+};
+
+void dev_make(char *name, read read, write write);
+uint32_t dev_read(struct fs_node *dev, uint32_t offset, uint32_t size, char *buffer);
+uint32_t dev_write(struct fs_node *dev, uint32_t offset, uint32_t size, char *buffer);
+
+void dev_stdout();
+void dev_stdin();
+void dev_stderr();
+
+#endif
\ No newline at end of file
diff --git a/src/kernel/fs/vfs.c b/src/kernel/fs/vfs.c
index 68944c7..fd44f30 100644
--- a/src/kernel/fs/vfs.c
+++ b/src/kernel/fs/vfs.c
@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <kernel/fs/vfs.h>
+#include <kernel/lib/stdlib.h>
 
 struct fs_node *fs_root = NULL;
 
diff --git a/src/kernel/fs/vfs.h b/src/kernel/fs/vfs.h
index 6a26c07..867fae2 100644
--- a/src/kernel/fs/vfs.h
+++ b/src/kernel/fs/vfs.h
@@ -34,6 +34,7 @@ struct fs_node {
 	uint32_t gid;
 	enum node_type type;
 
+	struct dev *dev;
 	struct fs_node *node_ptr;
 
 	void *impl;