Initial commit

tasks/blkdev0/src/arch

@@ -0,0 +1 @@
+arch-arm

tasks/blkdev0/src/init.c

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+
+
+#include <blkdev.h>
+#include <ramdisk.h>
+
+
+void init_blkdev(void)
+{
+	ramdisk.ops.open(&ramdisk);
+}

tasks/blkdev0/src/ramdisk.c

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+/*
+ * A basic ramdisk implementation.
+ *
+ * Copyright (C) 2007 Bahadir Balban
+ *
+ * The ramdisk binary is embedded in the data section of the ramdisk device
+ * executable. Read/writes simply occur to this area. The disk area could
+ * have any filesystem layout e.g. romfs, which is irrelevant for this code.
+ */
+#include <blkdev.h>
+#include <ramdisk.h>
+#include <l4/macros.h>
+#include <l4/config.h>
+#include <l4/types.h>
+#include <string.h>
+#include INC_SUBARCH(mm.h)
+#include INC_GLUE(memory.h)
+
+/* Ramdisk section markers for ramdisk inside this executable image */
+extern char _start_ramdisk[];
+extern char _end_ramdisk[];
+static unsigned long ramdisk_base;
+
+void ramdisk_open(struct block_device *ramdisk)
+{
+	ramdisk_base = (unsigned long)_start_ramdisk;
+	ramdisk->size = (unsigned long)_end_ramdisk -
+			(unsigned long)_start_ramdisk;
+}
+
+void ramdisk_read(unsigned long offset, int size, void *buf)
+{
+	void *src = (void *)(ramdisk_base + offset);
+
+	memcpy(buf, src, size);
+}
+
+void ramdisk_write(unsigned long offset, int size, void *buf)
+{
+	void *dst = (void *)(ramdisk_base + offset);
+
+	memcpy(dst, buf, size);
+}
+
+void ramdisk_readpage(unsigned long pfn, void *buf)
+{
+	ramdisk_read(__pfn_to_addr(pfn), PAGE_SIZE, buf);
+}
+
+void ramdisk_writepage(unsigned long pfn, void *buf)
+{
+	ramdisk_write(__pfn_to_addr(pfn), PAGE_SIZE, buf);
+}
+
+struct block_device ramdisk = {
+	.name = "ramdisk",
+	.ops = {
+		.open = ramdisk_open,
+		.read = ramdisk_read,
+		.write = ramdisk_write,
+		.read_page = ramdisk_readpage,
+		.write_page = ramdisk_writepage,
+	},
+};
+