From 2f719330b8afee5075b48d428c836e2c0a3bb14e Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <tullivan99@gmail.com>
Date: Sun, 4 Nov 2018 23:46:12 -0500
Subject: vfs, initrd

---
 src/fs/Makefile | 22 +++++++++++++
 src/fs/initrd.c | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/fs/initrd.h |  6 ++++
 3 files changed, 125 insertions(+)
 create mode 100644 src/fs/Makefile
 create mode 100644 src/fs/initrd.c
 create mode 100644 src/fs/initrd.h

(limited to 'src/fs')

diff --git a/src/fs/Makefile b/src/fs/Makefile
new file mode 100644
index 0000000..d22fbf3
--- /dev/null
+++ b/src/fs/Makefile
@@ -0,0 +1,22 @@
+CFILES = $(wildcard *.c)
+AFILES = $(wildcard *.s) 
+OFILES = $(patsubst %.c, %.o, $(CFILES)) \
+	 $(patsubst %.s, %.asm.o, $(AFILES))
+
+CFLAGS += -I.. -I../arch/cmsis
+
+all: $(OFILES)
+
+%.o: %.c
+	@echo "  CC     " $<
+	@$(CROSS)$(CC) $(CFLAGS) -c $< -o $@
+
+%.asm.o: %.s
+	@echo "  AS     " $<
+	@$(CROSS)$(AS) $(AFLAGS) -c $< -o $@
+
+clean:
+	@echo "  CLEAN"
+	@rm -f $(OFILES)
+
+
diff --git a/src/fs/initrd.c b/src/fs/initrd.c
new file mode 100644
index 0000000..efa430c
--- /dev/null
+++ b/src/fs/initrd.c
@@ -0,0 +1,97 @@
+#include <stdint.h>
+#include <string.h>
+
+#include <kernel/heap.h>
+#include <kernel/vfs.h>
+
+typedef struct {
+	char *address;
+	uint32_t pos;
+	uint32_t size;
+} initrd_info;
+
+extern uint8_t _binary_initrd_img_start[];
+extern uint8_t _binary_initrd_img_size[];
+
+static const uint8_t *initrd_start = (uint8_t *)_binary_initrd_img_start;
+static const uint32_t initrd_size = (uint32_t)_binary_initrd_img_size;
+
+void *initrd_open(const char *file);
+uint32_t initrd_read(void *info, uint32_t count, uint8_t *buffer);
+
+char *initrd_getfile(uint32_t offset);
+
+static const vfs_volume_funcs initrd_funcs = {
+	initrd_open,
+	0, // close
+	initrd_read,
+	0, // write
+	0  // readdir
+};
+
+void initrd_init(void)
+{
+	vfs_mount(&initrd_funcs, VFS_READONLY);
+}
+
+void *initrd_open(const char *file)
+{
+	char *ptr;
+	for (uint32_t i = 0; ptr = initrd_getfile(i), ptr != 0; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		if (!strncmp(file, ptr + 4, len)) {
+			initrd_info *file = (initrd_info *)malloc(
+				sizeof(initrd_info));
+			file->address = ptr + len + 8;
+			file->pos = 0;
+			file->size = *(uint32_t *)(ptr + len + 4);
+			return file;
+		}
+	}
+
+	return 0;
+}
+
+uint32_t initrd_read(void *info, uint32_t count, uint8_t *buffer)
+{
+	initrd_info *iinfo = (initrd_info *)info;
+	if (iinfo == 0 || iinfo->address == 0)
+		return 0;
+	
+	uint32_t i;
+	for (i = 0; i < count; i++) {
+		if (iinfo->pos >= iinfo->size)
+			break;
+
+		buffer[iinfo->pos] = iinfo->address[iinfo->pos];
+		iinfo->pos++;
+	}
+
+	return i;
+}
+
+/*char *readfile(const char *name)
+{
+	char *ptr;
+	for (uint32_t i = 0; ptr = getfile(i), ptr != 0; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		if (!strncmp(name, ptr + 4, len))
+			return ptr + len + 8;
+	}
+	return 0;
+}*/
+
+char *initrd_getfile(uint32_t offset)
+{
+	char *ptr = (char *)initrd_start;
+	for (uint32_t i = 0; i < offset; i++) {
+		uint32_t len = *((uint32_t *)ptr);
+		uint32_t datalen = *((uint32_t *)(ptr + 4 + len));
+		ptr += len + datalen + 8;
+		if (ptr >= (char *)(initrd_start + initrd_size))
+			return 0;
+	}
+
+	return ptr;
+}
+
diff --git a/src/fs/initrd.h b/src/fs/initrd.h
new file mode 100644
index 0000000..dbc0079
--- /dev/null
+++ b/src/fs/initrd.h
@@ -0,0 +1,6 @@
+#ifndef INTIRD_H_
+#define INITRD_H_
+
+void initrd_init(void);
+
+#endif // INITRD_H_
-- 
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