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authorFranklin Wei <frankhwei536@gmail.com>2015-03-02 21:37:09 -0500
committerFranklin Wei <frankhwei536@gmail.com>2015-03-02 21:37:09 -0500
commit46e94578765d3d2f03b83421d752e5dfc3e56d34 (patch)
tree0a7d4187e8e62e1fccdf0dc8ee89e4ffcdf7aac7
parent35d98182c5b86c25eb4e7fd18fc68f240683960b (diff)
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initrd support, not used yet
-rw-r--r--docs/INITRD6
-rw-r--r--include/kernel/initrd.h4
-rw-r--r--initrdbin0 -> 7154 bytes
-rw-r--r--kernel/initrd.c53
-rw-r--r--tools/mkinitrd.c34
5 files changed, 97 insertions, 0 deletions
diff --git a/docs/INITRD b/docs/INITRD
new file mode 100644
index 0000000..228c717
--- /dev/null
+++ b/docs/INITRD
@@ -0,0 +1,6 @@
+struct file_t
+{
+char name[32];
+int size;
+char data[size];
+};
diff --git a/include/kernel/initrd.h b/include/kernel/initrd.h
new file mode 100644
index 0000000..c7a368c
--- /dev/null
+++ b/include/kernel/initrd.h
@@ -0,0 +1,4 @@
+#include "multiboot.h"
+
+void initrd_init(struct multiboot_info_t*);
+void initrd_read(void);
diff --git a/initrd b/initrd
new file mode 100644
index 0000000..55eda05
--- /dev/null
+++ b/initrd
Binary files differ
diff --git a/kernel/initrd.c b/kernel/initrd.c
new file mode 100644
index 0000000..c34bcfa
--- /dev/null
+++ b/kernel/initrd.c
@@ -0,0 +1,53 @@
+#include <stddef.h>
+#include <stdio.h>
+#include "heap.h"
+#include "multiboot.h"
+#include "panic.h"
+
+static struct multiboot_mod_t *modlist;
+static unsigned int mods_count;
+
+void initrd_read(void)
+{
+ if(modlist && mods_count)
+ {
+ printf("Number of modules: %d\n", mods_count);
+ char *ptr = (char*)modlist[0].mod_start;
+ while(ptr < (char*)modlist[0].mod_end)
+ {
+ char *name = ptr;
+ ptr += 32;
+ uint32_t sz = *(uint32_t*)ptr;
+ ptr += 4;
+ printf("File name: \"%s\"\n", name);
+ printf("File length: %x\n", sz);
+ char *end = ptr + sz;
+ printf("Contents:\n");
+ while(ptr < end)
+ {
+ putchar(*ptr++);
+ }
+ }
+ }
+ else
+ {
+ printf("No initrd loaded!\n");
+ }
+}
+
+void initrd_init(struct multiboot_info_t *hdr)
+{
+ if(hdr->flags & (1<<3))
+ {
+ modlist = (struct multiboot_mod_t*)hdr->mods_addr;
+ mods_count = hdr->mods_count;
+ printf("Number of modules: %d\n", mods_count);
+ /* prevent kmalloc from overwriting the modules */
+ kmalloc_set_addr(modlist[mods_count-1].mod_end);
+ }
+ else
+ {
+ modlist = NULL;
+ mods_count = 0;
+ }
+}
diff --git a/tools/mkinitrd.c b/tools/mkinitrd.c
new file mode 100644
index 0000000..d61bbba
--- /dev/null
+++ b/tools/mkinitrd.c
@@ -0,0 +1,34 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+void write_le32(int fd, uint32_t n)
+{
+ write(fd, &n, 4);
+}
+
+#define MIN(x,y) (x<y?x:y)
+
+int main(int argc, char* argv[])
+{
+ int fd = open("initrd.img", O_APPEND | O_WRONLY | O_CREAT, 0666);
+ char buf[32];
+ assert(strlen(argv[1]) < 32);
+ memset(buf, 0, 32);
+ memcpy(buf, argv[1], strlen(argv[1]));
+ write(fd, buf, 32);
+ int datafd = open(argv[1], O_RDONLY, 0666);
+ lseek(datafd, 0, SEEK_END);
+ FILE *f = fdopen(datafd, "rb");
+ uint32_t len = ftell(f);
+ write_le32(fd, ftell(f));
+ int ch;
+ lseek(datafd, 0, SEEK_SET);
+ do {
+ ch = getc(f);
+ if(ch != EOF)
+ write(fd, &ch, 1);
+ } while(ch != EOF);
+}