setup.c

底层驱动开发

{
}

int obp_system_intr(void)
{
	if (boot_flags & BOOTME_DEBUG) {
		printk("OBP: system interrupted\n");
		prom_halt();
		return 1;
	}
	return 0;
}

/* 
 * Process kernel command line switches that are specific to the
 * SPARC or that require special low-level processing.
 */
static void __init process_switch(char c)
{
	switch (c) {
	case 'd':
		boot_flags |= BOOTME_DEBUG;
		break;
	case 's':
		boot_flags |= BOOTME_SINGLE;
		break;
	case 'h':
		prom_printf("boot_flags_init: Halt!\n");
		prom_halt();
		break;
	case 'p':
		/* Use PROM debug console. */
		register_console(&prom_debug_console);
		break;
	case 'P':
		/* Force UltraSPARC-III P-Cache on. */
		if (tlb_type != cheetah) {
			printk("BOOT: Ignoring P-Cache force option.\n");
			break;
		}
		cheetah_pcache_forced_on = 1;
		add_taint(TAINT_MACHINE_CHECK);
		cheetah_enable_pcache();
		break;

	default:
		printk("Unknown boot switch (-%c)\n", c);
		break;
	}
}

static void __init process_console(char *commands)
{
	serial_console = 0;
	commands += 8;
	/* Linux-style serial */
	if (!strncmp(commands, "ttyS", 4))
		serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
	else if (!strncmp(commands, "tty", 3)) {
		char c = *(commands + 3);
		/* Solaris-style serial */
		if (c == 'a' || c == 'b') {
			serial_console = c - 'a' + 1;
			prom_printf ("Using /dev/tty%c as console.\n", c);
		}
		/* else Linux-style fbcon, not serial */
	}
#if defined(CONFIG_PROM_CONSOLE)
	if (!strncmp(commands, "prom", 4)) {
		char *p;

		for (p = commands - 8; *p && *p != ' '; p++)
			*p = ' ';
		conswitchp = &prom_con;
	}
#endif
}

static void __init boot_flags_init(char *commands)
{
	while (*commands) {
		/* Move to the start of the next "argument". */
		while (*commands && *commands == ' ')
			commands++;

		/* Process any command switches, otherwise skip it. */
		if (*commands == '\0')
			break;
		if (*commands == '-') {
			commands++;
			while (*commands && *commands != ' ')
				process_switch(*commands++);
			continue;
		}
		if (!strncmp(commands, "console=", 8)) {
			process_console(commands);
		} else if (!strncmp(commands, "mem=", 4)) {
			/*
			 * "mem=XXX[kKmM]" overrides the PROM-reported
			 * memory size.
			 */
			cmdline_memory_size = simple_strtoul(commands + 4,
							     &commands, 0);
			if (*commands == 'K' || *commands == 'k') {
				cmdline_memory_size <<= 10;
				commands++;
			} else if (*commands=='M' || *commands=='m') {
				cmdline_memory_size <<= 20;
				commands++;
			}
		}
		while (*commands && *commands != ' ')
			commands++;
	}
}

extern void panic_setup(char *, int *);

extern unsigned short root_flags;
extern unsigned short root_dev;
extern unsigned short ram_flags;
#define RAMDISK_IMAGE_START_MASK	0x07FF
#define RAMDISK_PROMPT_FLAG		0x8000
#define RAMDISK_LOAD_FLAG		0x4000

extern int root_mountflags;

char reboot_command[COMMAND_LINE_SIZE];

static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };

void register_prom_callbacks(void)
{
	prom_setcallback(prom_callback);
	prom_feval(": linux-va>tte-data 2 \" va>tte-data\" $callback drop ; "
		   "' linux-va>tte-data to va>tte-data");
	prom_feval(": linux-.soft1 1 \" .soft1\" $callback 2drop ; "
		   "' linux-.soft1 to .soft1");
	prom_feval(": linux-.soft2 1 \" .soft2\" $callback 2drop ; "
		   "' linux-.soft2 to .soft2");
}

void __init setup_arch(char **cmdline_p)
{
	/* Initialize PROM console and command line. */
	*cmdline_p = prom_getbootargs();
	strcpy(saved_command_line, *cmdline_p);

	printk("ARCH: SUN4U\n");

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#elif defined(CONFIG_PROM_CONSOLE)
	conswitchp = &prom_con;
#endif

	/* Work out if we are starfire early on */
	check_if_starfire();

	boot_flags_init(*cmdline_p);

	idprom_init();

	if (!root_flags)
		root_mountflags &= ~MS_RDONLY;
	ROOT_DEV = old_decode_dev(root_dev);
#ifdef CONFIG_BLK_DEV_INITRD
	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);	
#endif

	init_task.thread_info->kregs = &fake_swapper_regs;

#ifdef CONFIG_IP_PNP
	if (!ic_set_manually) {
		int chosen = prom_finddevice ("/chosen");
		u32 cl, sv, gw;
		
		cl = prom_getintdefault (chosen, "client-ip", 0);
		sv = prom_getintdefault (chosen, "server-ip", 0);
		gw = prom_getintdefault (chosen, "gateway-ip", 0);
		if (cl && sv) {
			ic_myaddr = cl;
			ic_servaddr = sv;
			if (gw)
				ic_gateway = gw;
#if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
			ic_proto_enabled = 0;
#endif
		}
	}
#endif

	paging_init();
}

static int __init set_preferred_console(void)
{
	int idev, odev;

	/* The user has requested a console so this is already set up. */
	if (serial_console >= 0)
		return -EBUSY;

	idev = prom_query_input_device();
	odev = prom_query_output_device();
	if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
		serial_console = 0;
	} else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
		serial_console = 1;
	} else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
		serial_console = 2;
	} else {
		prom_printf("Inconsistent console: "
			    "input %d, output %d\n",
			    idev, odev);
		prom_halt();
	}

	if (serial_console)
		return add_preferred_console("ttyS", serial_console - 1, NULL);

	return -ENODEV;
}
console_initcall(set_preferred_console);

/* BUFFER is PAGE_SIZE bytes long. */

extern char *sparc_cpu_type;
extern char *sparc_fpu_type;

extern void smp_info(struct seq_file *);
extern void smp_bogo(struct seq_file *);
extern void mmu_info(struct seq_file *);

unsigned int dcache_parity_tl1_occurred;
unsigned int icache_parity_tl1_occurred;

static int show_cpuinfo(struct seq_file *m, void *__unused)
{
	seq_printf(m, 
		   "cpu\t\t: %s\n"
		   "fpu\t\t: %s\n"
		   "promlib\t\t: Version 3 Revision %d\n"
		   "prom\t\t: %d.%d.%d\n"
		   "type\t\t: sun4u\n"
		   "ncpus probed\t: %ld\n"
		   "ncpus active\t: %ld\n"
		   "D$ parity tl1\t: %u\n"
		   "I$ parity tl1\t: %u\n"
#ifndef CONFIG_SMP
		   "Cpu0Bogo\t: %lu.%02lu\n"
		   "Cpu0ClkTck\t: %016lx\n"
#endif
		   ,
		   sparc_cpu_type,
		   sparc_fpu_type,
		   prom_rev,
		   prom_prev >> 16,
		   (prom_prev >> 8) & 0xff,
		   prom_prev & 0xff,
		   (long)num_possible_cpus(),
		   (long)num_online_cpus(),
		   dcache_parity_tl1_occurred,
		   icache_parity_tl1_occurred
#ifndef CONFIG_SMP
		   , cpu_data(0).udelay_val/(500000/HZ),
		   (cpu_data(0).udelay_val/(5000/HZ)) % 100,
		   cpu_data(0).clock_tick
#endif
		);
#ifdef CONFIG_SMP
	smp_bogo(m);
#endif
	mmu_info(m);
#ifdef CONFIG_SMP
	smp_info(m);
#endif
	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	/* The pointer we are returning is arbitrary,
	 * it just has to be non-NULL and not IS_ERR
	 * in the success case.
	 */
	return *pos == 0 ? &c_start : 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,
};

extern int stop_a_enabled;

void sun_do_break(void)
{
	if (!stop_a_enabled)
		return;

	prom_printf("\n");
	flush_user_windows();

	prom_cmdline();
}

int serial_console = -1;
int stop_a_enabled = 1;

static int __init topology_init(void)
{
	int i, err;

	err = -ENOMEM;
	for (i = 0; i < NR_CPUS; i++) {
		if (cpu_possible(i)) {
			struct cpu *p = kmalloc(sizeof(*p), GFP_KERNEL);

			if (p) {
				memset(p, 0, sizeof(*p));
				register_cpu(p, i, NULL);
				err = 0;
			}
		}
	}

	return err;
}

subsys_initcall(topology_init);