setup.c

来自「优龙2410linux2.6.8内核源代码」· C语言 代码 · 共 756 行 · 第 1/2 页

	min = pvr & 0xFF;

	seq_printf(m, "processor\t: %lu\n", cpu_id);
	seq_printf(m, "cpu\t\t: ");

	if (cur_cpu_spec->pvr_mask)
		seq_printf(m, "%s", cur_cpu_spec->cpu_name);
	else
		seq_printf(m, "unknown (%08x)", pvr);

#ifdef CONFIG_ALTIVEC
	if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
		seq_printf(m, ", altivec supported");
#endif /* CONFIG_ALTIVEC */

	seq_printf(m, "\n");

	/*
	 * Assume here that all clock rates are the same in a
	 * smp system.  -- Cort
	 */
	seq_printf(m, "clock\t\t: %lu.%06luMHz\n", ppc_proc_freq / 1000000,
		   ppc_proc_freq % 1000000);

	seq_printf(m, "revision\t: %hd.%hd\n\n", maj, min);

	preempt_enable();
	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos <= NR_CPUS ? (void *)((*pos)+1) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}
static void c_stop(struct seq_file *m, void *v)
{
}
struct seq_operations cpuinfo_op = {
	.start =c_start,
	.next =	c_next,
	.stop =	c_stop,
	.show =	show_cpuinfo,
};

/*
 * Fetch the cmd_line from open firmware. 
 */
void parse_cmd_line(unsigned long r3, unsigned long r4, unsigned long r5,
		  unsigned long r6, unsigned long r7)
{
	cmd_line[0] = 0;

#ifdef CONFIG_CMDLINE
	strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
#endif /* CONFIG_CMDLINE */

#ifdef CONFIG_PPC_PSERIES
	{
	struct device_node *chosen;

	chosen = of_find_node_by_name(NULL, "chosen");
	if (chosen != NULL) {
		char *p;
		p = get_property(chosen, "bootargs", NULL);
		if (p != NULL && p[0] != 0)
			strlcpy(cmd_line, p, sizeof(cmd_line));
		of_node_put(chosen);
	}
	}
#endif

	/* Look for mem= option on command line */
	if (strstr(cmd_line, "mem=")) {
		char *p, *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;
	}
}

#ifdef CONFIG_PPC_PSERIES
static int __init set_preferred_console(void)
{
	struct device_node *prom_stdout;
	char *name;
	int offset;

	/* The user has requested a console so this is already set up. */
	if (strstr(saved_command_line, "console="))
		return -EBUSY;

	prom_stdout = find_path_device(of_stdout_device);
	if (!prom_stdout)
		return -ENODEV;

	name = (char *)get_property(prom_stdout, "name", NULL);
	if (!name)
		return -ENODEV;

	if (strcmp(name, "serial") == 0) {
		int i;
		u32 *reg = (u32 *)get_property(prom_stdout, "reg", &i);
		if (i > 8) {
			switch (reg[1]) {
				case 0x3f8:
					offset = 0;
					break;
				case 0x2f8:
					offset = 1;
					break;
				case 0x898:
					offset = 2;
					break;
				case 0x890:
					offset = 3;
					break;
				default:
					/* We dont recognise the serial port */
					return -ENODEV;
			}
		}
	} else if (strcmp(name, "vty") == 0)
		/* pSeries LPAR virtual console */
		return add_preferred_console("hvc", 0, NULL);
	else if (strcmp(name, "ch-a") == 0)
		offset = 0;
	else if (strcmp(name, "ch-b") == 0)
		offset = 1;
	else
		return -ENODEV;

	return add_preferred_console("ttyS", offset, NULL);

}
console_initcall(set_preferred_console);

int parse_bootinfo(void)
{
	struct bi_record *rec;

	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:
			strlcpy(cmd_line, (void *)rec->data, sizeof(cmd_line));
			break;
		}
	}

	return 0;
}
#endif

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

	if (ppc_md.init != NULL) {
		ppc_md.init();
	}
	return 0;
}

arch_initcall(ppc_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);

#ifdef CONFIG_IRQSTACKS
static void __init irqstack_early_init(void)
{
	int i;

	/* interrupt stacks must be under 256MB, we cannot afford to take SLB misses on them */
	for (i = 0; i < NR_CPUS; i++) {
		softirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
					THREAD_SIZE, 0x10000000));
		hardirq_ctx[i] = (struct thread_info *)__va(lmb_alloc_base(THREAD_SIZE,
					THREAD_SIZE, 0x10000000));
	}
}
#else
#define irqstack_early_init()
#endif

/*
 * 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 void do_init_bootmem(void);

	calibrate_delay = ppc64_calibrate_delay;

	ppc64_boot_msg(0x12, "Setup Arch");

#ifdef CONFIG_XMON
	if (strstr(cmd_line, "xmon")) {
		/* ensure xmon is enabled */
		xmon_init();
		debugger(0);
	}
#endif /* CONFIG_XMON */

	/*
	 * 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;

	if (ppc_md.panic)
		notifier_chain_register(&panic_notifier_list, &ppc64_panic_block);

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

	irqstack_early_init();

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

	ppc_md.setup_arch();

	paging_init();
	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);
	printk("[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);
	printk("[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);
	printk("[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);
	printk("[dump]%04x %s\n", src, msg);
}

int set_spread_lpevents( char * str )
{
	/* The parameter is the number of processors to share in processing lp events */
	unsigned long i;
	unsigned long val = simple_strtoul( str, NULL, 0 );
	if ( ( val > 0 ) && ( val <= NR_CPUS ) ) {
		for ( i=1; i<val; ++i )
			paca[i].lpqueue_ptr = paca[0].lpqueue_ptr;
		printk("lpevent processing spread over %ld processors\n", 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 );