setup.c

linux-2.4.29操作系统的源码

		int i;
		char *name, *val = NULL;
		printk("of_stdout_device %s\n", of_stdout_device);
		if (prom_stdout) {
			name = (char *)get_property(prom_stdout, "name", NULL);
			if (name) {
				if (strcmp(name, "serial") == 0) {
					reg = (u32 *)get_property(prom_stdout, "reg", &i);
					if (i > 8) {
						switch (reg[1]) {
						    case 0x3f8: val = "ttyS0,9600"; break; 
						    case 0x2f8: val = "ttyS1,9600"; break; 
						    case 0x898: val = "ttyS2,9600"; break; 
						    case 0x890: val = "ttyS3,9600"; break; 
						}
					}
				} else if (strcmp(name, "vty") == 0) {
					/* pSeries LPAR virtual console */
					val = "hvc0";
				}
				if (val) {
					char tmp_cmd_line[512];
					snprintf(tmp_cmd_line, 512, 
						 "AUTOCONSOLE console=%s %s",
						 val, cmd_line);
					memcpy(cmd_line, tmp_cmd_line, 512);
					printk("console= not found, add console=%s\ncmd_line is now %s\n",
					       val, cmd_line);
				}
			}
		}
	}	

	/* Look for mem= option on command line */
	if (strstr(cmd_line, "mem=")) {
		char *q;
		unsigned long maxmem = 0;
		extern unsigned long __max_memory;

		for (q = cmd_line; (p = strstr(q, "mem=")) != 0; ) {
			q = p + 4;
			if (p > cmd_line && p[-1] != ' ')
				continue;
			maxmem = simple_strtoul(q, &q, 0);
			if (*q == 'k' || *q == 'K') {
				maxmem <<= 10;
				++q;
			} else if (*q == 'm' || *q == 'M') {
				maxmem <<= 20;
				++q;
			}
		}
		__max_memory = maxmem;
	}
}

#if 0
char *bi_tag2str(unsigned long tag)
{
	switch (tag) {
	case BI_FIRST:
		return "BI_FIRST";
	case BI_LAST:
		return "BI_LAST";
	case BI_CMD_LINE:
		return "BI_CMD_LINE";
	case BI_BOOTLOADER_ID:
		return "BI_BOOTLOADER_ID";
	case BI_INITRD:
		return "BI_INITRD";
	case BI_SYSMAP:
		return "BI_SYSMAP";
	case BI_MACHTYPE:
		return "BI_MACHTYPE";
	default:
		return "BI_UNKNOWN";
	}
}
#endif

int parse_bootinfo(void)
{
	struct bi_record *rec;
	extern char *sysmap;
	extern unsigned long sysmap_size;

	rec = prom.bi_recs;

	if ( rec == NULL || rec->tag != BI_FIRST )
		return -1;

	for ( ; rec->tag != BI_LAST ; rec = bi_rec_next(rec) ) {
		switch (rec->tag) {
		case BI_CMD_LINE:
			memcpy(cmd_line, (void *)rec->data, rec->size);
			break;
		case BI_SYSMAP:
			sysmap = (char *)((rec->data[0] >= (KERNELBASE))
					? rec->data[0] : (unsigned long)__va(rec->data[0]));
			sysmap_size = rec->data[1];
			break;
#ifdef CONFIG_BLK_DEV_INITRD
		case BI_INITRD:
			initrd_start = (unsigned long)__va(rec->data[0]);
			initrd_end = initrd_start + rec->data[1];
			ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
			initrd_below_start_ok = 1;
			break;
#endif /* CONFIG_BLK_DEV_INITRD */
		}
	}

	return 0;
}

void __init ppc_init(void)
{
	/* clear the progress line */
	ppc_md.progress(" ", 0xffff);

	if (ppc_md.init != NULL) {
		ppc_md.init();
	}
}

void __init ppc64_calibrate_delay(void)
{
	loops_per_jiffy = tb_ticks_per_jiffy;

	printk("Calibrating delay loop... %lu.%02lu BogoMips\n",
			       loops_per_jiffy/(500000/HZ),
			       loops_per_jiffy/(5000/HZ) % 100);
}	

extern void (*calibrate_delay)(void);
extern void sort_exception_table(void);

/*
 * Called into from start_kernel, after lock_kernel has been called.
 * Initializes bootmem, which is unsed to manage page allocation until
 * mem_init is called.
 */
void __init setup_arch(char **cmdline_p)
{
	extern int panic_timeout;
	extern char _etext[], _edata[];
	extern void do_init_bootmem(void);

	blk_nohighio = 1;

	calibrate_delay = ppc64_calibrate_delay;

	ppc64_boot_msg(0x12, "Setup Arch");
#ifdef CONFIG_XMON
	xmon_map_scc();
	if (strstr(cmd_line, "xmon"))
		xmon(0);
#endif /* CONFIG_XMON */

#if defined(CONFIG_KGDB)
	kgdb_map_scc();
	set_debug_traps();
	breakpoint();
#endif
	/*
	 * Set cache line size based on type of cpu as a default.
	 * Systems with OF can look in the properties on the cpu node(s)
	 * for a possibly more accurate value.
	 */
	dcache_bsize = systemcfg->dCacheL1LineSize; 
	icache_bsize = systemcfg->iCacheL1LineSize; 

	/* reboot on panic */
	panic_timeout = 180;

	init_mm.start_code = PAGE_OFFSET;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) klimit;
	
	/* Save unparsed command line copy for /proc/cmdline */
	strcpy(saved_command_line, cmd_line);
	*cmdline_p = cmd_line;

	/* set up the bootmem stuff with available memory */
	do_init_bootmem();

	ppc_md.setup_arch();

	paging_init();
	sort_exception_table();
	ppc64_boot_msg(0x15, "Setup Done");
}


/* ToDo: do something useful if ppc_md is not yet setup. */
#define PPC64_LINUX_FUNCTION 0x0f000000
#define PPC64_IPL_MESSAGE 0xc0000000
#define PPC64_TERM_MESSAGE 0xb0000000
#define PPC64_ATTN_MESSAGE 0xa0000000
#define PPC64_DUMP_MESSAGE 0xd0000000

static void ppc64_do_msg(unsigned int src, const char *msg)
{
	if (ppc_md.progress) {
		char buf[32];

		sprintf(buf, "%08x        \n", src);
		ppc_md.progress(buf, 0);
		sprintf(buf, "%-16s", msg);
		ppc_md.progress(buf, 0);
	}
}

/* Print a boot progress message. */
void ppc64_boot_msg(unsigned int src, const char *msg)
{
	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
	udbg_printf("[boot]%04x %s\n", src, msg);
}

/* Print a termination message (print only -- does not stop the kernel) */
void ppc64_terminate_msg(unsigned int src, const char *msg)
{
	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
	udbg_printf("[terminate]%04x %s\n", src, msg);
}

/* Print something that needs attention (device error, etc) */
void ppc64_attention_msg(unsigned int src, const char *msg)
{
	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_ATTN_MESSAGE|src, msg);
	udbg_printf("[attention]%04x %s\n", src, msg);
}

/* Print a dump progress message. */
void ppc64_dump_msg(unsigned int src, const char *msg)
{
	ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_DUMP_MESSAGE|src, msg);
	udbg_printf("[dump]%04x %s\n", src, msg);
}


void exception_trace(unsigned long trap)
{
	unsigned long x, srr0, srr1, reg20, reg1, reg21;

	asm("mflr %0" : "=r" (x) :);
	asm("mfspr %0,0x1a" : "=r" (srr0) :);
	asm("mfspr %0,0x1b" : "=r" (srr1) :);
	asm("mr %0,1" : "=r" (reg1) :);
	asm("mr %0,20" : "=r" (reg20) :);
	asm("mr %0,21" : "=r" (reg21) :);

	udbg_puts("\n");
	udbg_puts("Took an exception : "); udbg_puthex(x); udbg_puts("\n");
	udbg_puts("   "); udbg_puthex(reg1); udbg_puts("\n");
	udbg_puts("   "); udbg_puthex(reg20); udbg_puts("\n");
	udbg_puts("   "); udbg_puthex(reg21); udbg_puts("\n");
	udbg_puts("   "); udbg_puthex(srr0); udbg_puts("\n");
	udbg_puts("   "); udbg_puthex(srr1); udbg_puts("\n");
}

void do_spread_lpevents(unsigned long n)
{
	unsigned long i,m;

	if (n < MAX_PACAS)
		m = n;
	else
		m = MAX_PACAS;

	for (i=1; i<m; ++i)
		paca[i].lpQueuePtr = paca[0].lpQueuePtr;

	printk("lpevent processing spread over %ld processors\n", n);
}

/*
 * The parameter is the number of processors to share in
 * processing lp events
 */
int set_spread_lpevents(char * str)
{
	unsigned long val = simple_strtoul( str, NULL, 0 );
	if ((val > 0) && (val <= MAX_PACAS)) {
		do_spread_lpevents(val);
	} else
		printk("invalid spreaqd_lpevents %ld\n", val);

	return 1;
}

/* This should only be called on processor 0 during calibrate decr */
void setup_default_decr(void)
{
	struct paca_struct *lpaca = get_paca();

	if ( decr_overclock_set && !decr_overclock_proc0_set )
		decr_overclock_proc0 = decr_overclock;

	lpaca->default_decr = tb_ticks_per_jiffy / decr_overclock_proc0;	
	lpaca->next_jiffy_update_tb = get_tb() + tb_ticks_per_jiffy;
}

int set_decr_overclock_proc0( char * str )
{
	unsigned long val = simple_strtoul( str, NULL, 0 );
	if ( ( val >= 1 ) && ( val <= 48 ) ) {
		decr_overclock_proc0_set = 1;
		decr_overclock_proc0 = val;
		printk("proc 0 decrementer overclock factor of %ld\n", val);
	}
	else
		printk("invalid proc 0 decrementer overclock factor of %ld\n", val);
	return 1;
}

int set_decr_overclock( char * str )
{
	unsigned long val = simple_strtoul( str, NULL, 0 );
	if ( ( val >= 1 ) && ( val <= 48 ) ) {
		decr_overclock_set = 1;
		decr_overclock = val;
		printk("decrementer overclock factor of %ld\n", val);
	}
	else
		printk("invalid decrementer overclock factor of %ld\n", val);
	return 1;

}

__setup("spread_lpevents=", set_spread_lpevents );
__setup("decr_overclock_proc0=", set_decr_overclock_proc0 );
__setup("decr_overclock=", set_decr_overclock );