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-rw-r--r--initrd/initrd.c84
-rw-r--r--initrd/tar.h18
2 files changed, 102 insertions, 0 deletions
diff --git a/initrd/initrd.c b/initrd/initrd.c
new file mode 100644
index 0000000..8fe0f01
--- /dev/null
+++ b/initrd/initrd.c
@@ -0,0 +1,84 @@
+#include "initrd.h"
+#include "tar.h"
+#include "string.h"
+#include "commandline.h"
+#include "memory.h"
+#include "print.h"
+#include "klib/rbtree.h"
+#include "klib/hash.h"
+#include "boot.h"
+
+static rbtree_t s_initrd_files;
+
+static size_t
+s_tar_oct_dec(const char *oct)
+{
+ size_t value = 0;
+ while(*oct != 0) {
+ value *= 8;
+ value += (*oct) - '0';
+ oct++;
+ }
+ return value;
+}
+
+static void
+s_initrd_parse(struct BootModule *module)
+{
+ struct tar_block *sector = (struct tar_block*)module->addr;
+ while(true) {
+ tar_header_t *header = (tar_header_t*)sector;
+ if(header->name[0] == 0) break;
+
+ initrd_file_t file_tmp;
+ initrd_file_t *file = rbtree_insert(
+ &s_initrd_files,
+ string_hash(header->name),
+ &file_tmp);
+
+ *file = (initrd_file_t){
+ .header = header,
+ .name = header->name,
+ .size = s_tar_oct_dec(header->size),
+ .data = &sector[1]
+ };
+ kdbgf("File %s size %i\n", file->name, file->size);
+
+ sector = &sector[(file->size / 512) + 1];
+ if(file->size % 512 > 0) sector = &sector[1];
+ }
+}
+
+initrd_file_t *
+ird_getfile(const char *path)
+{
+ initrd_file_t *file = rbtree_find(&s_initrd_files, string_hash(path));
+ return file;
+}
+
+void
+initrd_setup(void)
+{
+ const char *initrd_path = cmdline_get("initrd");
+ if(initrd_path == 0) {
+ kerrf("No initrd loaded!\n");
+ return;
+ }
+ kdbgf("Initrd located in module path %s\n", initrd_path);
+ struct BootModule *initrd_module = NULL;
+ for(size_t i = 0; i < boot_module_count; i++) {
+ struct BootModule *module = &boot_modules[i];
+ if(strcmp(module->path, initrd_path) == 0) {
+ initrd_module = module;
+ break;
+ }
+ }
+
+ if(initrd_module == NULL) {
+ klogf("Initrd not found in modules!\n");
+ return;
+ }
+
+ rbtree_new(&s_initrd_files, initrd_file_t);
+ s_initrd_parse(initrd_module);
+}
diff --git a/initrd/tar.h b/initrd/tar.h
new file mode 100644
index 0000000..5325a51
--- /dev/null
+++ b/initrd/tar.h
@@ -0,0 +1,18 @@
+#ifndef JOVE_INITRD_TAR_H
+#define JOVE_INITRD_TAR_H 1
+
+struct tar_block { char data[512]; };
+
+typedef struct tar_header {
+ char name[100];
+ char mode[8];
+ char owner[8];
+ char group[8];
+ char size[12];
+ char modified[12];
+ char checksum[8];
+ char link;
+ char linkname[100];
+} tar_header_t;
+
+#endif