418 lines
9.1 KiB
C
418 lines
9.1 KiB
C
/**************************************************************************
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Etherboot - Network Bootstrap Program
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Literature dealing with the network protocols:
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ARP - RFC826
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RARP - RFC903
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UDP - RFC768
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BOOTP - RFC951, RFC2132 (vendor extensions)
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DHCP - RFC2131, RFC2132 (options)
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TFTP - RFC1350, RFC2347 (options), RFC2348 (blocksize), RFC2349 (tsize)
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RPC - RFC1831, RFC1832 (XDR), RFC1833 (rpcbind/portmapper)
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NFS - RFC1094, RFC1813 (v3, useful for clarifications, not implemented)
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IGMP - RFC1112
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**************************************************************************/
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/* #define MDEBUG */
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#include "etherboot.h"
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#include "dev.h"
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#include "nic.h"
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#include "disk.h"
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#include "http.h"
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#include "timer.h"
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#include "cpu.h"
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#include "console.h"
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#include "init.h"
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#include <stdarg.h>
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#ifdef CONFIG_FILO
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#include <lib.h>
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#endif
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jmp_buf restart_etherboot;
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int url_port;
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char as_main_program = 1;
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#ifdef IMAGE_FREEBSD
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int freebsd_howto = 0;
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char freebsd_kernel_env[FREEBSD_KERNEL_ENV_SIZE];
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#endif
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static inline unsigned long ask_boot(unsigned *index)
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{
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unsigned long order = DEFAULT_BOOT_ORDER;
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*index = DEFAULT_BOOT_INDEX;
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#ifdef LINUXBIOS
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order = get_boot_order(order, index);
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#endif
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#if defined(ASK_BOOT)
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#if ASK_BOOT >= 0
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while(1) {
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int c = 0;
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printf(ASK_PROMPT);
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#if ASK_BOOT > 0
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{
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unsigned long time;
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for ( time = currticks() + ASK_BOOT*TICKS_PER_SEC;
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!c && !iskey(); ) {
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if (currticks() > time) c = ANS_DEFAULT;
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}
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}
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#endif /* ASK_BOOT > 0 */
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if ( !c ) c = getchar();
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if ((c >= 'a') && (c <= 'z')) c &= 0x5F;
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if ((c >= ' ') && (c <= '~')) putchar(c);
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putchar('\n');
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switch(c) {
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default:
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/* Nothing useful try again */
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continue;
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case ANS_QUIT:
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order = BOOT_NOTHING;
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*index = 0;
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break;
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case ANS_DEFAULT:
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/* Preserve the default boot order */
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break;
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case ANS_NETWORK:
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order = (BOOT_NIC << (0*BOOT_BITS)) |
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(BOOT_NOTHING << (1*BOOT_BITS));
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*index = 0;
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break;
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case ANS_DISK:
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order = (BOOT_DISK << (0*BOOT_BITS)) |
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(BOOT_NOTHING << (1*BOOT_BITS));
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*index = 0;
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break;
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case ANS_FLOPPY:
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order = (BOOT_FLOPPY << (0*BOOT_BITS)) |
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(BOOT_NOTHING << (1*BOOT_BITS));
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*index = 0;
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break;
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}
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break;
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}
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putchar('\n');
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#endif /* ASK_BOOT >= 0 */
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#endif /* defined(ASK_BOOT) */
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return order;
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}
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static inline void try_floppy_first(void)
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{
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#if (TRY_FLOPPY_FIRST > 0)
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int i;
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printf("Trying floppy");
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disk_init();
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for (i = TRY_FLOPPY_FIRST; i-- > 0; ) {
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putchar('.');
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if (pcbios_disk_read(0, 0, 0, 0, ((char *)FLOPPY_BOOT_LOCATION)) != 0x8000) {
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printf("using floppy\n");
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exit(0);
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}
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}
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printf("no floppy\n");
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#endif /* TRY_FLOPPY_FIRST */
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}
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static struct class_operations {
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struct dev *dev;
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int (*probe)(struct dev *dev);
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int (*load_configuration)(struct dev *dev);
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int (*load)(struct dev *dev);
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}
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operations[] = {
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{ &nic.dev, eth_probe, eth_load_configuration, eth_load },
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{ &disk.dev, disk_probe, disk_load_configuration, disk_load },
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{ &disk.dev, disk_probe, disk_load_configuration, disk_load },
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};
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static int main_loop(int state);
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static int exit_ok;
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static int exit_status;
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static int initialized;
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/**************************************************************************
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MAIN - Kick off routine
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**************************************************************************/
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int main ( void ) {
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int state;
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print_config();
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cleanup();
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/* -1: timeout or ESC
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-2: error return from loader
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-3: finish the current run.
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0: retry booting bootp and tftp
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1: retry tftp with possibly modified bootp reply
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2: retry bootp and tftp
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3: retry probe bootp and tftp
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4: start with the next device and retry from there...
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255: exit Etherboot
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256: retry after relocation
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*/
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state = setjmp(restart_etherboot);
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exit_ok = 1;
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for(;state != 255;) {
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state = main_loop(state);
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}
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/* arch_on_exit(exit_status) */
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return exit_status;
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}
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void exit(int status)
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{
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while(!exit_ok)
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;
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exit_status = status;
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longjmp(restart_etherboot, 255);
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}
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static int main_loop(int state)
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{
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/* Splitting main into 2 pieces makes the semantics of
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* which variables are preserved across a longjmp clean
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* and predictable.
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*/
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static unsigned long order;
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static unsigned boot_index;
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static struct dev * dev = 0;
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static struct class_operations *ops;
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static int type;
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static int i;
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if (!initialized) {
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initialized = 1;
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if (dev && (state >= 1) && (state <= 2)) {
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dev->how_probe = PROBE_AWAKE;
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dev->how_probe = ops->probe(dev);
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if (dev->how_probe == PROBE_FAILED) {
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state = -1;
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}
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}
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}
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switch(state) {
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case 0:
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{
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static int firsttime = 1;
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/* First time through */
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if (firsttime) {
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cleanup();
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firsttime = 0;
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}
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#ifdef EXIT_IF_NO_OFFER
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else {
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cleanup();
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exit(0);
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}
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#endif
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i = -1;
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state = 4;
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dev = 0;
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/* We just called setjmp ... */
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order = ask_boot(&boot_index);
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try_floppy_first();
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break;
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}
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case 4:
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cleanup();
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call_reset_fns();
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/* Find a dev entry to probe with */
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if (!dev) {
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int boot;
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int failsafe;
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/* Advance to the next device type */
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i++;
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boot = (order >> (i * BOOT_BITS)) & BOOT_MASK;
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type = boot & BOOT_TYPE_MASK;
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failsafe = (boot & BOOT_FAILSAFE) != 0;
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if (i >= MAX_BOOT_ENTRIES) {
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type = BOOT_NOTHING;
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}
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if ((i == 0) && (type == BOOT_NOTHING)) {
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/* Return to caller */
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exit(0);
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}
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if (type >= BOOT_NOTHING) {
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interruptible_sleep(2);
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state = 0;
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break;
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}
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ops = &operations[type];
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dev = ops->dev;
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dev->how_probe = PROBE_FIRST;
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dev->type = type;
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dev->failsafe = failsafe;
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dev->type_index = 0;
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} else {
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/* Advance to the next device of the same type */
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dev->how_probe = PROBE_NEXT;
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}
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state = 3;
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break;
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case 3:
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state = -1;
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/* Removed the following line because it was causing
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* heap.o to be dragged in unnecessarily. It's also
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* slightly puzzling: by resetting heap_base, doesn't
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* this mean that we permanently leak memory?
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*/
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/* heap_base = allot(0); */
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dev->how_probe = ops->probe(dev);
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if (dev->how_probe == PROBE_FAILED) {
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dev = 0;
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state = 4;
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} else if (boot_index && (i == 0) && (boot_index != (unsigned)dev->type_index)) {
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printf("Wrong index\n");
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state = 4;
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}
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else {
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state = 2;
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}
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break;
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case 2:
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state = -1;
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if (ops->load_configuration(dev) >= 0) {
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state = 1;
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}
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break;
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case 1:
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/* Any return from load is a failure */
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ops->load(dev);
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state = -1;
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break;
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case 256:
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state = 0;
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break;
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case -3:
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i = MAX_BOOT_ENTRIES;
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type = BOOT_NOTHING;
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/* fall through */
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default:
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printf("<abort>\n");
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state = 4;
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/* At the end goto state 0 */
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if ((type >= BOOT_NOTHING) || (i >= MAX_BOOT_ENTRIES)) {
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state = 0;
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}
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break;
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}
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return state;
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}
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/**************************************************************************
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LOADKERNEL - Try to load kernel image
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**************************************************************************/
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struct proto {
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char *name;
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int (*load)(const char *name,
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int (*fnc)(unsigned char *, unsigned int, unsigned int, int));
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};
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static const struct proto protos[] = {
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#ifdef DOWNLOAD_PROTO_TFTM
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{ "x-tftm", url_tftm },
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#endif
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#ifdef DOWNLOAD_PROTO_SLAM
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{ "x-slam", url_slam },
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#endif
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#ifdef DOWNLOAD_PROTO_NFS
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{ "nfs", nfs },
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#endif
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#ifdef DOWNLOAD_PROTO_DISK
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{ "file", url_file },
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#endif
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#ifdef DOWNLOAD_PROTO_TFTP
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{ "tftp", tftp },
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#endif
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#ifdef DOWNLOAD_PROTO_HTTP
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{ "http", http },
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#endif
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};
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int loadkernel(const char *fname)
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{
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static const struct proto * const last_proto =
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&protos[sizeof(protos)/sizeof(protos[0])];
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const struct proto *proto;
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in_addr ip;
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int len;
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const char *name;
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#ifdef DNS_RESOLVER
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const char *resolvt;
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#endif
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ip.s_addr = arptable[ARP_SERVER].ipaddr.s_addr;
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name = fname;
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url_port = -1;
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len = 0;
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while(fname[len] && fname[len] != ':') {
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len++;
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}
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for(proto = &protos[0]; proto < last_proto; proto++) {
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if (memcmp(name, proto->name, len) == 0) {
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break;
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}
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}
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if ((proto < last_proto) && (memcmp(fname + len, "://", 3) == 0)) {
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name += len + 3;
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if (name[0] != '/') {
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#ifdef DNS_RESOLVER
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resolvt = dns_resolver ( name );
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if ( NULL != resolvt ) {
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//printf ("Resolved host name [%s] to [%s]\n",
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// name, resolvt );
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inet_aton(resolvt, &ip);
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while ( ( '/' != name[0] ) && ( 0 != name[0]))
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++name;
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} else
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#endif /* DNS_RESOLVER */
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name += inet_aton(name, &ip);
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if (name[0] == ':') {
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name++;
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url_port = strtoul(name, &name, 10);
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}
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}
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if (name[0] == '/') {
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arptable[ARP_SERVER].ipaddr.s_addr = ip.s_addr;
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printf( "Loading %s ", fname );
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return proto->load(name + 1, load_block);
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}
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}
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printf("Loading %@:%s ", arptable[ARP_SERVER].ipaddr, fname);
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#ifdef DEFAULT_PROTO_NFS
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return nfs(fname, load_block);
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#else
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return tftp(fname, load_block);
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#endif
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}
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/**************************************************************************
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CLEANUP - shut down networking and console so that the OS may be called
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**************************************************************************/
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void cleanup(void)
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{
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#ifdef DOWNLOAD_PROTO_NFS
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nfs_umountall(ARP_SERVER);
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#endif
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/* Stop receiving packets */
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eth_disable();
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disk_disable();
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initialized = 0;
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}
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/*
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* Local variables:
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* c-basic-offset: 8
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* End:
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*/
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