- uint64_t gdtr_operand;
-
- /* Our TSS is never used in a call gate or task gate, so only a
- few fields of it are ever referenced, and those are the only
- ones we initialize. */
- tss = palloc_get (PAL_ASSERT | PAL_ZERO);
- tss->esp0 = (uint32_t) ptov(0x20000);
- tss->ss0 = SEL_KDSEG;
- tss->bitmap = 0xdfff;
-
- /* Initialize GDT. */
- gdt[SEL_NULL / sizeof *gdt] = 0;
- gdt[SEL_KCSEG / sizeof *gdt] = make_code_desc (0);
- gdt[SEL_KDSEG / sizeof *gdt] = make_data_desc (0);
- gdt[SEL_UCSEG / sizeof *gdt] = make_code_desc (3);
- gdt[SEL_UDSEG / sizeof *gdt] = make_data_desc (3);
- gdt[SEL_TSS / sizeof *gdt] = make_tss_desc (vtop (tss));
-
- /* Load GDTR, TR. */
- gdtr_operand = make_dtr_operand (sizeof gdt - 1, gdt);
- asm volatile ("lgdt %0" :: "m" (gdtr_operand));
- asm volatile ("ltr %w0" :: "r" (SEL_TSS));
+ char *cmd_line, *pos;
+ char *argv[LOADER_CMD_LINE_LEN / 2 + 2];
+ int argc = 0;
+ int i;
+
+ /* The command line is made up of null terminated strings
+ followed by an empty string. Break it up into words. */
+ cmd_line = pos = ptov (LOADER_CMD_LINE);
+ printf ("Kernel command line:");
+ while (pos < cmd_line + LOADER_CMD_LINE_LEN)
+ {
+ ASSERT (argc < LOADER_CMD_LINE_LEN / 2);
+ if (*pos == '\0')
+ break;
+ argv[argc++] = pos;
+ printf (" %s", pos);
+ pos = strchr (pos, '\0') + 1;
+ }
+ printf ("\n");
+ argv[argc] = "";
+ argv[argc + 1] = "";
+
+ /* Parse the words. */
+ for (i = 0; i < argc; i++)
+ if (!strcmp (argv[i], "-rs"))
+ random_init (atoi (argv[++i]));
+ else if (!strcmp (argv[i], "-d"))
+ debug_enable (argv[++i]);
+ else if (!strcmp (argv[i], "-q"))
+ power_off_when_done = true;
+#ifdef USERPROG
+ else if (!strcmp (argv[i], "-ex"))
+ initial_program = argv[++i];
+ else if (!strcmp (argv[i], "-ul"))
+ max_user_pages = atoi (argv[++i]);
+#endif
+#ifdef FILESYS
+ else if (!strcmp (argv[i], "-f"))
+ format_filesys = true;
+ else if (!strcmp (argv[i], "-ci"))
+ {
+ fsutil_copyin_file = argv[++i];
+ fsutil_copyin_size = atoi (argv[++i]);
+ }
+ else if (!strcmp (argv[i], "-co"))
+ fsutil_copyout_file = argv[++i];
+ else if (!strcmp (argv[i], "-p"))
+ fsutil_print_file = argv[++i];
+ else if (!strcmp (argv[i], "-r"))
+ fsutil_remove_file = argv[++i];
+ else if (!strcmp (argv[i], "-ls"))
+ fsutil_list_files = true;
+ else if (!strcmp (argv[i], "-D"))
+ fsutil_dump_filesys = true;
+#endif
+ else if (!strcmp (argv[i], "-u"))
+ {
+ printf (
+ "Kernel options:\n"
+ " -rs SEED Seed random seed to SEED.\n"
+ " -d CLASS[,...] Enable the given classes of debug messages.\n"
+#ifdef USERPROG
+ " -ex 'PROG [ARG...]' Run PROG, passing the optional arguments.\n"
+ " -ul USER_MAX Limit user memory to USER_MAX pages.\n"
+#endif
+#ifdef FILESYS
+ " -f Format the file system disk (hdb or hd0:1).\n"
+ " -ci FILENAME SIZE Copy SIZE bytes from the scratch disk (hdc\n"
+ " or hd1:0) into the file system as FILENAME\n"
+ " -co FILENAME Copy FILENAME to the scratch disk, with\n"
+ " size at start of sector 0 and data afterward\n"
+ " -p FILENAME Print the contents of FILENAME\n"
+ " -r FILENAME Delete FILENAME\n"
+ " -ls List the files in the file system\n"
+ " -D Dump complete file system contents\n"
+#endif
+ " -q Power off after doing requested actions.\n"
+ " -u Print this help message and power off.\n"
+ );
+ power_off ();
+ }
+ else
+ PANIC ("unknown option `%s' (use -u for help)", argv[i]);