setup.c

linux-2.6.15.6

	set_prefix((u32)(unsigned long) lc);
}

static void __init
setup_resources(void)
{
	struct resource *res;
	int i;

	for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
		res = alloc_bootmem_low(sizeof(struct resource));
		res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
		switch (memory_chunk[i].type) {
		case CHUNK_READ_WRITE:
			res->name = "System RAM";
			break;
		case CHUNK_READ_ONLY:
			res->name = "System ROM";
			res->flags |= IORESOURCE_READONLY;
			break;
		default:
			res->name = "reserved";
		}
		res->start = memory_chunk[i].addr;
		res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
		request_resource(&iomem_resource, res);
		request_resource(res, &code_resource);
		request_resource(res, &data_resource);
	}
}

static void __init
setup_memory(void)
{
        unsigned long bootmap_size;
	unsigned long start_pfn, end_pfn, init_pfn;
	unsigned long last_rw_end;
	int i;

	/*
	 * partially used pages are not usable - thus
	 * we are rounding upwards:
	 */
	start_pfn = (__pa(&_end) + PAGE_SIZE - 1) >> PAGE_SHIFT;
	end_pfn = max_pfn = memory_end >> PAGE_SHIFT;

	/* Initialize storage key for kernel pages */
	for (init_pfn = 0 ; init_pfn < start_pfn; init_pfn++)
		page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);

	/*
	 * Initialize the boot-time allocator (with low memory only):
	 */
	bootmap_size = init_bootmem(start_pfn, end_pfn);

	/*
	 * Register RAM areas with the bootmem allocator.
	 */
	last_rw_end = start_pfn;

	for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
		unsigned long start_chunk, end_chunk;

		if (memory_chunk[i].type != CHUNK_READ_WRITE)
			continue;
		start_chunk = (memory_chunk[i].addr + PAGE_SIZE - 1);
		start_chunk >>= PAGE_SHIFT;
		end_chunk = (memory_chunk[i].addr + memory_chunk[i].size);
		end_chunk >>= PAGE_SHIFT;
		if (start_chunk < start_pfn)
			start_chunk = start_pfn;
		if (end_chunk > end_pfn)
			end_chunk = end_pfn;
		if (start_chunk < end_chunk) {
			/* Initialize storage key for RAM pages */
			for (init_pfn = start_chunk ; init_pfn < end_chunk;
			     init_pfn++)
				page_set_storage_key(init_pfn << PAGE_SHIFT,
						     PAGE_DEFAULT_KEY);
			free_bootmem(start_chunk << PAGE_SHIFT,
				     (end_chunk - start_chunk) << PAGE_SHIFT);
			if (last_rw_end < start_chunk)
				add_memory_hole(last_rw_end, start_chunk - 1);
			last_rw_end = end_chunk;
		}
	}

	psw_set_key(PAGE_DEFAULT_KEY);

	if (last_rw_end < end_pfn - 1)
		add_memory_hole(last_rw_end, end_pfn - 1);

	/*
	 * Reserve the bootmem bitmap itself as well. We do this in two
	 * steps (first step was init_bootmem()) because this catches
	 * the (very unlikely) case of us accidentally initializing the
	 * bootmem allocator with an invalid RAM area.
	 */
	reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size);

#ifdef CONFIG_BLK_DEV_INITRD
	if (INITRD_START) {
		if (INITRD_START + INITRD_SIZE <= memory_end) {
			reserve_bootmem(INITRD_START, INITRD_SIZE);
			initrd_start = INITRD_START;
			initrd_end = initrd_start + INITRD_SIZE;
		} else {
			printk("initrd extends beyond end of memory "
			       "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
			       initrd_start + INITRD_SIZE, memory_end);
			initrd_start = initrd_end = 0;
		}
	}
#endif
}

/*
 * Setup function called from init/main.c just after the banner
 * was printed.
 */

void __init
setup_arch(char **cmdline_p)
{
        /*
         * print what head.S has found out about the machine
         */
#ifndef CONFIG_ARCH_S390X
	printk((MACHINE_IS_VM) ?
	       "We are running under VM (31 bit mode)\n" :
	       "We are running native (31 bit mode)\n");
	printk((MACHINE_HAS_IEEE) ?
	       "This machine has an IEEE fpu\n" :
	       "This machine has no IEEE fpu\n");
#else /* CONFIG_ARCH_S390X */
	printk((MACHINE_IS_VM) ?
	       "We are running under VM (64 bit mode)\n" :
	       "We are running native (64 bit mode)\n");
#endif /* CONFIG_ARCH_S390X */

        ROOT_DEV = Root_RAM0;
#ifndef CONFIG_ARCH_S390X
	memory_end = memory_size & ~0x400000UL;  /* align memory end to 4MB */
        /*
         * We need some free virtual space to be able to do vmalloc.
         * On a machine with 2GB memory we make sure that we have at
         * least 128 MB free space for vmalloc.
         */
        if (memory_end > 1920*1024*1024)
                memory_end = 1920*1024*1024;
#else /* CONFIG_ARCH_S390X */
	memory_end = memory_size & ~0x200000UL;  /* detected in head.s */
#endif /* CONFIG_ARCH_S390X */

	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) &_end;

	parse_cmdline_early(cmdline_p);

	setup_memory();
	setup_resources();
	setup_lowcore();

        cpu_init();
        __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;

	/*
	 * Create kernel page tables and switch to virtual addressing.
	 */
        paging_init();

        /* Setup default console */
	conmode_default();
}

void print_cpu_info(struct cpuinfo_S390 *cpuinfo)
{
   printk("cpu %d "
#ifdef CONFIG_SMP
           "phys_idx=%d "
#endif
           "vers=%02X ident=%06X machine=%04X unused=%04X\n",
           cpuinfo->cpu_nr,
#ifdef CONFIG_SMP
           cpuinfo->cpu_addr,
#endif
           cpuinfo->cpu_id.version,
           cpuinfo->cpu_id.ident,
           cpuinfo->cpu_id.machine,
           cpuinfo->cpu_id.unused);
}

/*
 * show_cpuinfo - Get information on one CPU for use by procfs.
 */

static int show_cpuinfo(struct seq_file *m, void *v)
{
        struct cpuinfo_S390 *cpuinfo;
	unsigned long n = (unsigned long) v - 1;

	preempt_disable();
	if (!n) {
		seq_printf(m, "vendor_id       : IBM/S390\n"
			       "# processors    : %i\n"
			       "bogomips per cpu: %lu.%02lu\n",
			       num_online_cpus(), loops_per_jiffy/(500000/HZ),
			       (loops_per_jiffy/(5000/HZ))%100);
	}
	if (cpu_online(n)) {
#ifdef CONFIG_SMP
		if (smp_processor_id() == n)
			cpuinfo = &S390_lowcore.cpu_data;
		else
			cpuinfo = &lowcore_ptr[n]->cpu_data;
#else
		cpuinfo = &S390_lowcore.cpu_data;
#endif
		seq_printf(m, "processor %li: "
			       "version = %02X,  "
			       "identification = %06X,  "
			       "machine = %04X\n",
			       n, cpuinfo->cpu_id.version,
			       cpuinfo->cpu_id.ident,
			       cpuinfo->cpu_id.machine);
	}
	preempt_enable();
        return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < NR_CPUS ? (void *)((unsigned long) *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,
};

#define DEFINE_IPL_ATTR(_name, _format, _value)			\
static ssize_t ipl_##_name##_show(struct subsystem *subsys,	\
		char *page)					\
{								\
	return sprintf(page, _format, _value);			\
}								\
static struct subsys_attribute ipl_##_name##_attr =		\
	__ATTR(_name, S_IRUGO, ipl_##_name##_show, NULL);

DEFINE_IPL_ATTR(wwpn, "0x%016llx\n", (unsigned long long)
		IPL_PARMBLOCK_START->fcp.wwpn);
DEFINE_IPL_ATTR(lun, "0x%016llx\n", (unsigned long long)
		IPL_PARMBLOCK_START->fcp.lun);
DEFINE_IPL_ATTR(bootprog, "%lld\n", (unsigned long long)
		IPL_PARMBLOCK_START->fcp.bootprog);
DEFINE_IPL_ATTR(br_lba, "%lld\n", (unsigned long long)
		IPL_PARMBLOCK_START->fcp.br_lba);

enum ipl_type_type {
	ipl_type_unknown,
	ipl_type_ccw,
	ipl_type_fcp,
};

static enum ipl_type_type
get_ipl_type(void)
{
	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;

	if (!IPL_DEVNO_VALID)
		return ipl_type_unknown;
	if (!IPL_PARMBLOCK_VALID)
		return ipl_type_ccw;
	if (ipl->hdr.header.version > IPL_MAX_SUPPORTED_VERSION)
		return ipl_type_unknown;
	if (ipl->fcp.pbt != IPL_TYPE_FCP)
		return ipl_type_unknown;
	return ipl_type_fcp;
}

static ssize_t
ipl_type_show(struct subsystem *subsys, char *page)
{
	switch (get_ipl_type()) {
	case ipl_type_ccw:
		return sprintf(page, "ccw\n");
	case ipl_type_fcp:
		return sprintf(page, "fcp\n");
	default:
		return sprintf(page, "unknown\n");
	}
}

static struct subsys_attribute ipl_type_attr = __ATTR_RO(ipl_type);

static ssize_t
ipl_device_show(struct subsystem *subsys, char *page)
{
	struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;

	switch (get_ipl_type()) {
	case ipl_type_ccw:
		return sprintf(page, "0.0.%04x\n", ipl_devno);
	case ipl_type_fcp:
		return sprintf(page, "0.0.%04x\n", ipl->fcp.devno);
	default:
		return 0;
	}
}

static struct subsys_attribute ipl_device_attr =
	__ATTR(device, S_IRUGO, ipl_device_show, NULL);

static struct attribute *ipl_fcp_attrs[] = {
	&ipl_type_attr.attr,
	&ipl_device_attr.attr,
	&ipl_wwpn_attr.attr,
	&ipl_lun_attr.attr,
	&ipl_bootprog_attr.attr,
	&ipl_br_lba_attr.attr,
	NULL,
};

static struct attribute_group ipl_fcp_attr_group = {
	.attrs = ipl_fcp_attrs,
};

static struct attribute *ipl_ccw_attrs[] = {
	&ipl_type_attr.attr,
	&ipl_device_attr.attr,
	NULL,
};

static struct attribute_group ipl_ccw_attr_group = {
	.attrs = ipl_ccw_attrs,
};

static struct attribute *ipl_unknown_attrs[] = {
	&ipl_type_attr.attr,
	NULL,
};

static struct attribute_group ipl_unknown_attr_group = {
	.attrs = ipl_unknown_attrs,
};

static ssize_t
ipl_parameter_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
	unsigned int size = IPL_PARMBLOCK_SIZE;

	if (off > size)
		return 0;
	if (off + count > size)
		count = size - off;

	memcpy(buf, (void *) IPL_PARMBLOCK_START + off, count);
	return count;
}

static struct bin_attribute ipl_parameter_attr = {
	.attr = {
		.name = "binary_parameter",
		.mode = S_IRUGO,
		.owner = THIS_MODULE,
	},
	.size = PAGE_SIZE,
	.read = &ipl_parameter_read,
};

static ssize_t
ipl_scp_data_read(struct kobject *kobj, char *buf, loff_t off, size_t count)
{
	unsigned int size =  IPL_PARMBLOCK_START->fcp.scp_data_len;
	void *scp_data = &IPL_PARMBLOCK_START->fcp.scp_data;

	if (off > size)
		return 0;
	if (off + count > size)
		count = size - off;

	memcpy(buf, scp_data + off, count);
	return count;
}

static struct bin_attribute ipl_scp_data_attr = {
	.attr = {
		.name = "scp_data",
		.mode = S_IRUGO,
		.owner = THIS_MODULE,
	},
	.size = PAGE_SIZE,
	.read = &ipl_scp_data_read,
};

static decl_subsys(ipl, NULL, NULL);

static int __init
ipl_device_sysfs_register(void) {
	int rc;

	rc = firmware_register(&ipl_subsys);
	if (rc)
		return rc;

	switch (get_ipl_type()) {
	case ipl_type_ccw:
		sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_ccw_attr_group);
		break;
	case ipl_type_fcp:
		sysfs_create_group(&ipl_subsys.kset.kobj, &ipl_fcp_attr_group);
		sysfs_create_bin_file(&ipl_subsys.kset.kobj,
				      &ipl_parameter_attr);
		sysfs_create_bin_file(&ipl_subsys.kset.kobj,
				      &ipl_scp_data_attr);
		break;
	default:
		sysfs_create_group(&ipl_subsys.kset.kobj,
				   &ipl_unknown_attr_group);
		break;
	}
	return 0;
}

__initcall(ipl_device_sysfs_register);