X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Floader.h;h=5bd981384202504e528fa968edd25814679228a0;hb=19becec31c5704572a3575336c57364d72fd572b;hp=9507a6b4ad4426fc0e8e1ce6f1337950cfd09927;hpb=5ca4944f013a17ec694a1fcb30b5d63e07d51c70;p=pintos-anon

diff --git a/src/threads/loader.h b/src/threads/loader.h
index 9507a6b..5bd9813 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. */
@@ -17,11 +17,22 @@
    This must be aligned on a 4 MB boundary. */
 #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_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. */
+/* Important loader physical addresses. */
+#define LOADER_SIG (LOADER_END - LOADER_SIG_LEN)   /* 0xaa55 BIOS signature. */
+#define LOADER_ARGS (LOADER_SIG - LOADER_ARGS_LEN)     /* Command-line args. */
+#define LOADER_ARG_CNT (LOADER_ARGS - LOADER_ARG_CNT_LEN) /* Number of args. */
+#define LOADER_RAM_PGS (LOADER_ARG_CNT - LOADER_RAM_PGS_LEN) /* # RAM pages. */
 
-#endif /* loader.h */
+/* Sizes of loader data structures. */
+#define LOADER_SIG_LEN 2
+#define LOADER_ARGS_LEN 128
+#define LOADER_ARG_CNT_LEN 4
+#define LOADER_RAM_PGS_LEN 4
+
+/* 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 */