X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Floader.h;h=b412af362f546f429324d60cee952cd6577ebf73;hb=590f912cc145f43329a8e6db8f97db3a836a1755;hp=6ae2856fc827651c3056baf9d639fba2e6b3f71d;hpb=8063d8f3b3a778e9a15eff66dfd1b08652bae523;p=pintos-anon

diff --git a/src/threads/loader.h b/src/threads/loader.h
index 6ae2856..b412af3 100644
--- a/src/threads/loader.h
+++ b/src/threads/loader.h
@@ -1,5 +1,5 @@
-#ifndef HEADER_LOADER_H
-#define HEADER_LOADER_H
+#ifndef THREADS_LOADER_H
+#define THREADS_LOADER_H
 
 /* Constants fixed by the PC BIOS. */
 #define LOADER_BASE 0x7c00      /* Physical address of loader's base. */
@@ -18,8 +18,16 @@
 #define LOADER_PHYS_BASE 0xc0000000     /* 3 GB. */
 
 /* Offsets within the loader. */
-#define LOADER_BIOS_SIG (LOADER_END - 2)         /* 0xaa55 BIOS signature. */
-#define LOADER_CMD_LINE (LOADER_BIOS_SIG - 0x80) /* Kernel command line. */
-#define LOADER_RAM_PAGES (LOADER_CMD_LINE - 4)   /* # of pages of RAM. */
+#define LOADER_BIOS_SIG (LOADER_END - 2)        /* 0xaa55 BIOS signature. */
+#define LOADER_CMD_LINE_LEN 0x80                /* Command line length. */
+#define LOADER_CMD_LINE (LOADER_BIOS_SIG - LOADER_CMD_LINE_LEN)
+                                                /* Kernel command line. */
+#define LOADER_RAM_PAGES (LOADER_CMD_LINE - 4)  /* # of pages of RAM. */
 
-#endif /* loader.h */
+/* GDT selectors defined by loader.
+   More selectors are defined by userprog/gdt.h. */
+#define SEL_NULL        0x00    /* Null selector. */
+#define SEL_KCSEG       0x08    /* Kernel code selector. */
+#define SEL_KDSEG       0x10    /* Kernel data selector. */
+
+#endif /* threads/loader.h */