X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Finit.c;h=c17316aa59efec1951ad48eed5c8e4522a3e0381;hb=7d4e3dda080a47db88616f1c0d975f2091be47f1;hp=35ce92a2e255c7b68865931877dba832c9ff048a;hpb=b2a1e970fa78d8b4c31239ff2ac9ef2b4bab09a7;p=pintos-anon diff --git a/src/threads/init.c b/src/threads/init.c index 35ce92a..c17316a 100644 --- a/src/threads/init.c +++ b/src/threads/init.c @@ -1,4 +1,5 @@ #include "threads/init.h" +#include #include #include #include @@ -16,10 +17,11 @@ #include "threads/loader.h" #include "threads/malloc.h" #include "threads/mmu.h" -#include "threads/paging.h" #include "threads/palloc.h" +#include "threads/test.h" #include "threads/thread.h" #ifdef USERPROG +#include "userprog/process.h" #include "userprog/exception.h" #include "userprog/gdt.h" #include "userprog/syscall.h" @@ -34,46 +36,61 @@ /* Amount of physical memory, in 4 kB pages. */ size_t ram_pages; +/* Page directory with kernel mappings only. */ +uint32_t *base_page_dir; + #ifdef FILESYS -/* Format the filesystem? */ +/* -f: Format the filesystem? */ static bool format_filesys; #endif #ifdef USERPROG -/* Initial program to run. */ +/* -ex: Initial program to run. */ static char *initial_program; #endif +/* -q: Power off after kernel tasks complete? */ +bool power_off_when_done; + static void ram_init (void); +static void paging_init (void); static void argv_init (void); +static void print_stats (void); int main (void) NO_RETURN; int main (void) { - /* Needed by printf(), so initialize them very early. */ + /* Clear BSS and get machine's RAM size. */ ram_init (); + + /* Initialize ourselves as a thread so we can use locks. */ + thread_init (); + + /* Initialize the console so we can use printf(). */ vga_init (); serial_init_poll (); + console_init (); /* Greet user. */ - printf ("Booting cnachos86 with %'d kB RAM...\n", ram_pages * 4); + printf ("Pintos booting with %'zu kB RAM...\n", ram_pages * PGSIZE / 1024); /* Parse command line. */ argv_init (); - /* Initialize memory system, segments, paging. */ - thread_init (); + /* Initialize memory system. */ palloc_init (); + malloc_init (); paging_init (); + + /* Segmentation. */ #ifdef USERPROG tss_init (); gdt_init (); #endif - malloc_init (); - /* Set random seed if not already done. */ + /* Set random seed if argv_init() didn't. */ random_init (0); /* Initialize interrupt handlers. */ @@ -88,6 +105,7 @@ main (void) /* Start thread scheduler and enable interrupts. */ thread_start (); serial_init_queue (); + timer_calibrate (); #ifdef FILESYS /* Initialize filesystem. */ @@ -102,13 +120,24 @@ main (void) /* Run a user program. */ if (initial_program != NULL) { + tid_t tid; printf ("\nExecuting '%s':\n", initial_program); - thread_execute (initial_program); + tid = process_execute (initial_program); +#ifdef THREAD_JOIN_IMPLEMENTED + if (tid != TID_ERROR) + thread_join (tid); +#endif } +#else + /* Run the compiled-in test function. */ + test (); #endif - /* Terminate this thread. */ - thread_exit (); + /* Finish up. */ + if (power_off_when_done) + power_off (); + else + thread_exit (); } /* Clear BSS and obtain RAM size from loader. */ @@ -128,27 +157,71 @@ ram_init (void) ram_pages = *(uint32_t *) ptov (LOADER_RAM_PAGES); } +/* Populates the base page directory and page table with the + kernel virtual mapping, and then sets up the CPU to use the + new page directory. Points base_page_dir to the page + directory it creates. + + At the time this function is called, the active page table + (set up by loader.S) only maps the first 4 MB of RAM, so we + should not try to use extravagant amounts of memory. + Fortunately, there is no need to do so. */ +static void +paging_init (void) +{ + uint32_t *pd, *pt; + size_t page; + + pd = base_page_dir = palloc_get_page (PAL_ASSERT | PAL_ZERO); + pt = NULL; + for (page = 0; page < ram_pages; page++) + { + uintptr_t paddr = page * PGSIZE; + void *vaddr = ptov (paddr); + size_t pde_idx = pd_no (vaddr); + size_t pte_idx = pt_no (vaddr); + + if (pd[pde_idx] == 0) + { + pt = palloc_get_page (PAL_ASSERT | PAL_ZERO); + pd[pde_idx] = pde_create (pt); + } + + pt[pte_idx] = pte_create_kernel (vaddr, true); + } + + /* Store the physical address of the page directory into CR3 + aka PDBR (page directory base register). This activates our + new page tables immediately. See [IA32-v2a] "MOV--Move + to/from Control Registers" and [IA32-v3] 3.7.5. */ + asm volatile ("mov %%cr3, %0" :: "r" (vtop (base_page_dir))); +} + /* Parses the command line. */ static void argv_init (void) { char *cmd_line, *pos; - char *argv[LOADER_CMD_LINE_LEN / 2 + 1]; + 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++) @@ -156,15 +229,24 @@ argv_init (void) 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")) + user_page_limit = atoi (argv[++i]); #endif #ifdef FILESYS - else if (!strcmp (argv[i], "-f")) + else if (!strcmp (argv[i], "-f")) format_filesys = true; - else if (!strcmp (argv[i], "-cp")) - fsutil_copy_arg = argv[++i]; + 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")) @@ -182,18 +264,62 @@ argv_init (void) " -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 filesystem disk (hdb or hd0:1).\n" - " -cp FILENAME:SIZE Copy SIZE bytes from the scratch disk (hdc\n" + " -ci FILENAME SIZE Copy SIZE bytes from the scratch disk (hdc\n" " or hd1:0) into the filesystem 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 filesystem\n" " -D Dump complete filesystem 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'", argv[i]); + PANIC ("unknown option `%s' (use -u for help)", argv[i]); +} + +/* Powers down the machine we're running on, + as long as we're running on Bochs or qemu. */ +void +power_off (void) +{ + const char s[] = "Shutdown"; + const char *p; + +#ifdef FILESYS + filesys_done (); +#endif + + print_stats (); + + printf ("Powering off...\n"); + serial_flush (); + + for (p = s; *p != '\0'; p++) + outb (0x8900, *p); + for (;;); +} + +/* Print statistics about Pintos execution. */ +static void +print_stats (void) +{ + timer_print_stats (); + thread_print_stats (); +#ifdef FILESYS + disk_print_stats (); +#endif + console_print_stats (); + kbd_print_stats (); +#ifdef USERPROG + exception_print_stats (); +#endif }