[net-next-2.6.git] / arch / s390 / kernel / early.c

/*
 *  arch/s390/kernel/early.c
 *
 *    Copyright IBM Corp. 2007
 *    Author(s): Hongjie Yang <hongjie@us.ibm.com>,
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/pfn.h>
#include <linux/uaccess.h>
#include <asm/ebcdic.h>
#include <asm/ipl.h>
#include <asm/lowcore.h>
#include <asm/processor.h>
#include <asm/sections.h>
#include <asm/setup.h>
#include <asm/sysinfo.h>
#include <asm/cpcmd.h>
#include <asm/sclp.h>
#include "entry.h"

/*
 * Create a Kernel NSS if the SAVESYS= parameter is defined
 */
#define DEFSYS_CMD_SIZE		128
#define SAVESYS_CMD_SIZE	32

char kernel_nss_name[NSS_NAME_SIZE + 1];

static unsigned long machine_flags;

static void __init setup_boot_command_line(void);


#ifdef CONFIG_SHARED_KERNEL
int __init savesys_ipl_nss(char *cmd, const int cmdlen);

asm(
	"	.section .init.text,\"ax\",@progbits\n"
	"	.align	4\n"
	"	.type	savesys_ipl_nss, @function\n"
	"savesys_ipl_nss:\n"
#ifdef CONFIG_64BIT
	"	stmg	6,15,48(15)\n"
	"	lgr	14,3\n"
	"	sam31\n"
	"	diag	2,14,0x8\n"
	"	sam64\n"
	"	lgr	2,14\n"
	"	lmg	6,15,48(15)\n"
#else
	"	stm	6,15,24(15)\n"
	"	lr	14,3\n"
	"	diag	2,14,0x8\n"
	"	lr	2,14\n"
	"	lm	6,15,24(15)\n"
#endif
	"	br	14\n"
	"	.size	savesys_ipl_nss, .-savesys_ipl_nss\n");

static noinline __init void create_kernel_nss(void)
{
	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned int sinitrd_pfn, einitrd_pfn;
#endif
	int response;
	size_t len;
	char *savesys_ptr;
	char upper_command_line[COMMAND_LINE_SIZE];
	char defsys_cmd[DEFSYS_CMD_SIZE];
	char savesys_cmd[SAVESYS_CMD_SIZE];

	/* Do nothing if we are not running under VM */
	if (!MACHINE_IS_VM)
		return;

	/* Convert COMMAND_LINE to upper case */
	for (i = 0; i < strlen(boot_command_line); i++)
		upper_command_line[i] = toupper(boot_command_line[i]);

	savesys_ptr = strstr(upper_command_line, "SAVESYS=");

	if (!savesys_ptr)
		return;

	savesys_ptr += 8;    /* Point to the beginning of the NSS name */
	for (i = 0; i < NSS_NAME_SIZE; i++) {
		if (savesys_ptr[i] == ' ' || savesys_ptr[i] == '\0')
			break;
		kernel_nss_name[i] = savesys_ptr[i];
	}

	stext_pfn = PFN_DOWN(__pa(&_stext));
	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	end_pfn = PFN_UP(__pa(&_end));
	min_size = end_pfn << 2;

	sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
		kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
		eshared_pfn, end_pfn);

#ifdef CONFIG_BLK_DEV_INITRD
	if (INITRD_START && INITRD_SIZE) {
		sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
		einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
		min_size = einitrd_pfn << 2;
		sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
		sinitrd_pfn, einitrd_pfn);
	}
#endif

	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
		defsys_cmd, min_size);
	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
		kernel_nss_name, kernel_nss_name);

	__cpcmd(defsys_cmd, NULL, 0, &response);

	if (response != 0) {
		kernel_nss_name[0] = '\0';
		return;
	}

	len = strlen(savesys_cmd);
	ASCEBC(savesys_cmd, len);
	response = savesys_ipl_nss(savesys_cmd, len);

	/* On success: response is equal to the command size,
	 *	       max SAVESYS_CMD_SIZE
	 * On error: response contains the numeric portion of cp error message.
	 *	     for SAVESYS it will be >= 263
	 */
	if (response > SAVESYS_CMD_SIZE) {
		kernel_nss_name[0] = '\0';
		return;
	}

	/* re-setup boot command line with new ipl vm parms */
	ipl_update_parameters();
	setup_boot_command_line();

	ipl_flags = IPL_NSS_VALID;
}

#else /* CONFIG_SHARED_KERNEL */

static inline void create_kernel_nss(void) { }

#endif /* CONFIG_SHARED_KERNEL */

/*
 * Clear bss memory
 */
static noinline __init void clear_bss_section(void)
{
	memset(__bss_start, 0, __bss_stop - __bss_start);
}

/*
 * Initialize storage key for kernel pages
 */
static noinline __init void init_kernel_storage_key(void)
{
	unsigned long end_pfn, init_pfn;

	end_pfn = PFN_UP(__pa(&_end));

	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
		page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
}

static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);

static noinline __init void detect_machine_type(void)
{
	/* No VM information? Looks like LPAR */
	if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
		return;
	if (!vmms.count)
		return;

	/* Running under KVM? If not we assume z/VM */
	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
		machine_flags |= MACHINE_FLAG_KVM;
	else
		machine_flags |= MACHINE_FLAG_VM;
}

static __init void early_pgm_check_handler(void)
{
	unsigned long addr;
	const struct exception_table_entry *fixup;

	addr = S390_lowcore.program_old_psw.addr;
	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	if (!fixup)
		disabled_wait(0);
	S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
}

static noinline __init void setup_lowcore_early(void)
{
	psw_t psw;

	psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
	psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
	S390_lowcore.external_new_psw = psw;
	psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
	S390_lowcore.program_new_psw = psw;
	s390_base_pgm_handler_fn = early_pgm_check_handler;
}

static noinline __init void setup_hpage(void)
{
#ifndef CONFIG_DEBUG_PAGEALLOC
	unsigned int facilities;

	facilities = stfl();
	if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
		return;
	machine_flags |= MACHINE_FLAG_HPAGE;
	__ctl_set_bit(0, 23);
#endif
}

static __init void detect_mvpg(void)
{
#ifndef CONFIG_64BIT
	int rc;

	asm volatile(
		"	la	0,0\n"
		"	mvpg	%2,%2\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	if (!rc)
		machine_flags |= MACHINE_FLAG_MVPG;
#endif
}

static __init void detect_ieee(void)
{
#ifndef CONFIG_64BIT
	int rc, tmp;

	asm volatile(
		"	efpc	%1,0\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	if (!rc)
		machine_flags |= MACHINE_FLAG_IEEE;
#endif
}

static __init void detect_csp(void)
{
#ifndef CONFIG_64BIT
	int rc;

	asm volatile(
		"	la	0,0\n"
		"	la	1,0\n"
		"	la	2,4\n"
		"	csp	0,2\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	if (!rc)
		machine_flags |= MACHINE_FLAG_CSP;
#endif
}

static __init void detect_diag9c(void)
{
	unsigned int cpu_address;
	int rc;

	cpu_address = stap();
	asm volatile(
		"	diag	%2,0,0x9c\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	if (!rc)
		machine_flags |= MACHINE_FLAG_DIAG9C;
}

static __init void detect_diag44(void)
{
#ifdef CONFIG_64BIT
	int rc;

	asm volatile(
		"	diag	0,0,0x44\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	if (!rc)
		machine_flags |= MACHINE_FLAG_DIAG44;
#endif
}

static __init void detect_machine_facilities(void)
{
#ifdef CONFIG_64BIT
	unsigned int facilities;

	facilities = stfl();
	if (facilities & (1 << 28))
		machine_flags |= MACHINE_FLAG_IDTE;
	if (facilities & (1 << 23))
		machine_flags |= MACHINE_FLAG_PFMF;
	if (facilities & (1 << 4))
		machine_flags |= MACHINE_FLAG_MVCOS;
#endif
}

static __init void rescue_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	/*
	 * Move the initrd right behind the bss section in case it starts
	 * within the bss section. So we don't overwrite it when the bss
	 * section gets cleared.
	 */
	if (!INITRD_START || !INITRD_SIZE)
		return;
	if (INITRD_START >= (unsigned long) __bss_stop)
		return;
	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	INITRD_START = (unsigned long) __bss_stop;
#endif
}

/* Set up boot command line */
static void __init setup_boot_command_line(void)
{
	char *parm = NULL;

	/* copy arch command line */
	strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);

	/* append IPL PARM data to the boot command line */
	if (MACHINE_IS_VM) {
		parm = boot_command_line + strlen(boot_command_line);
		*parm++ = ' ';
		get_ipl_vmparm(parm);
		if (parm[0] == '=')
			memmove(boot_command_line, parm + 1, strlen(parm));
	}
}


/*
 * Save ipl parameters, clear bss memory, initialize storage keys
 * and create a kernel NSS at startup if the SAVESYS= parm is defined
 */
void __init startup_init(void)
{
	ipl_save_parameters();
	rescue_initrd();
	clear_bss_section();
	init_kernel_storage_key();
	lockdep_init();
	lockdep_off();
	sort_main_extable();
	setup_lowcore_early();
	detect_machine_type();
	ipl_update_parameters();
	setup_boot_command_line();
	create_kernel_nss();
	detect_mvpg();
	detect_ieee();
	detect_csp();
	detect_diag9c();
	detect_diag44();
	detect_machine_facilities();
	setup_hpage();
	sclp_facilities_detect();
	detect_memory_layout(memory_chunk);
	S390_lowcore.machine_flags = machine_flags;
	lockdep_on();
}
Commit	Line	Data
ab14de6c HC	1	/*
	2	* arch/s390/kernel/early.c
	3	*
	4	* Copyright IBM Corp. 2007
	5	* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
	6	* Heiko Carstens <heiko.carstens@de.ibm.com>
	7	*/
	8
92e6ecf3	9	#include <linux/compiler.h>
ab14de6c HC	10	#include <linux/init.h>
	11	#include <linux/errno.h>
	12	#include <linux/string.h>
	13	#include <linux/ctype.h>
	14	#include <linux/lockdep.h>
	15	#include <linux/module.h>
	16	#include <linux/pfn.h>
	17	#include <linux/uaccess.h>
a0443fbb	18	#include <asm/ebcdic.h>
46b05d26	19	#include <asm/ipl.h>
ab14de6c HC	20	#include <asm/lowcore.h>
	21	#include <asm/processor.h>
	22	#include <asm/sections.h>
	23	#include <asm/setup.h>
92e6ecf3	24	#include <asm/sysinfo.h>
ab14de6c HC	25	#include <asm/cpcmd.h>
ab14de6c HC	26	#include <asm/sclp.h>
a806170e	27	#include "entry.h"
ab14de6c HC	28
	29	/*
	30	* Create a Kernel NSS if the SAVESYS= parameter is defined
	31	*/
a0443fbb	32	#define DEFSYS_CMD_SIZE 128
ab14de6c HC	33	#define SAVESYS_CMD_SIZE 32
ab14de6c HC	34
ab14de6c HC	35	char kernel_nss_name[NSS_NAME_SIZE + 1];
ab14de6c HC	36
25097bf1 CE	37	static unsigned long machine_flags;
25097bf1 CE	38
a0443fbb HB	39	static void __init setup_boot_command_line(void);
	40
	41
ab14de6c	42	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	43	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	44
	45	asm(
	46	" .section .init.text,\"ax\",@progbits\n"
	47	" .align 4\n"
	48	" .type savesys_ipl_nss, @function\n"
	49	"savesys_ipl_nss:\n"
	50	#ifdef CONFIG_64BIT
	51	" stmg 6,15,48(15)\n"
	52	" lgr 14,3\n"
	53	" sam31\n"
	54	" diag 2,14,0x8\n"
	55	" sam64\n"
	56	" lgr 2,14\n"
	57	" lmg 6,15,48(15)\n"
	58	#else
	59	" stm 6,15,24(15)\n"
	60	" lr 14,3\n"
	61	" diag 2,14,0x8\n"
	62	" lr 2,14\n"
	63	" lm 6,15,24(15)\n"
	64	#endif
	65	" br 14\n"
	66	" .size savesys_ipl_nss, .-savesys_ipl_nss\n");
	67
ab14de6c HC	68	static noinline __init void create_kernel_nss(void)
	69	{
	70	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	71	#ifdef CONFIG_BLK_DEV_INITRD
	72	unsigned int sinitrd_pfn, einitrd_pfn;
	73	#endif
	74	int response;
a0443fbb	75	size_t len;
ab14de6c HC	76	char *savesys_ptr;
	77	char upper_command_line[COMMAND_LINE_SIZE];
	78	char defsys_cmd[DEFSYS_CMD_SIZE];
	79	char savesys_cmd[SAVESYS_CMD_SIZE];
	80
	81	/* Do nothing if we are not running under VM */
	82	if (!MACHINE_IS_VM)
	83	return;
	84
	85	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	86	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	87	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	88
	89	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	90
	91	if (!savesys_ptr)
	92	return;
	93
	94	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	95	for (i = 0; i < NSS_NAME_SIZE; i++) {
	96	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	97	break;
	98	kernel_nss_name[i] = savesys_ptr[i];
	99	}
	100
	101	stext_pfn = PFN_DOWN(__pa(&_stext));
	102	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	103	end_pfn = PFN_UP(__pa(&_end));
	104	min_size = end_pfn << 2;
	105
	106	sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	107	kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
	108	eshared_pfn, end_pfn);
	109
	110	#ifdef CONFIG_BLK_DEV_INITRD
	111	if (INITRD_START && INITRD_SIZE) {
	112	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	113	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	114	min_size = einitrd_pfn << 2;
	115	sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
	116	sinitrd_pfn, einitrd_pfn);
	117	}
	118	#endif
	119
a0443fbb HB	120	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
a0443fbb HB	121	defsys_cmd, min_size);
ab14de6c HC	122	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
	123	kernel_nss_name, kernel_nss_name);
	124
	125	__cpcmd(defsys_cmd, NULL, 0, &response);
	126
583b33bc HY	127	if (response != 0) {
583b33bc HY	128	kernel_nss_name[0] = '\0';
ab14de6c	129	return;
583b33bc	130	}
ab14de6c	131
a0443fbb HB	132	len = strlen(savesys_cmd);
	133	ASCEBC(savesys_cmd, len);
	134	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	135
a0443fbb HB	136	/* On success: response is equal to the command size,
	137	* max SAVESYS_CMD_SIZE
	138	* On error: response contains the numeric portion of cp error message.
	139	* for SAVESYS it will be >= 263
	140	*/
	141	if (response > SAVESYS_CMD_SIZE) {
583b33bc	142	kernel_nss_name[0] = '\0';
ab14de6c	143	return;
583b33bc	144	}
ab14de6c	145
a0443fbb HB	146	/* re-setup boot command line with new ipl vm parms */
	147	ipl_update_parameters();
	148	setup_boot_command_line();
	149
ab14de6c HC	150	ipl_flags = IPL_NSS_VALID;
	151	}
	152
	153	#else /* CONFIG_SHARED_KERNEL */
	154
	155	static inline void create_kernel_nss(void) { }
	156
	157	#endif /* CONFIG_SHARED_KERNEL */
	158
	159	/*
	160	* Clear bss memory
	161	*/
	162	static noinline __init void clear_bss_section(void)
	163	{
229d9c6d	164	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	165	}
	166
	167	/*
	168	* Initialize storage key for kernel pages
	169	*/
	170	static noinline __init void init_kernel_storage_key(void)
	171	{
	172	unsigned long end_pfn, init_pfn;
	173
	174	end_pfn = PFN_UP(__pa(&_end));
	175
	176	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
	177	page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
	178	}
	179
92e6ecf3 CB	180	static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
92e6ecf3 CB	181
ab14de6c HC	182	static noinline __init void detect_machine_type(void)
ab14de6c HC	183	{
92e6ecf3 CB	184	/* No VM information? Looks like LPAR */
	185	if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
	186	return;
	187	if (!vmms.count)
	188	return;
ab14de6c	189
92e6ecf3 CB	190	/* Running under KVM? If not we assume z/VM */
92e6ecf3 CB	191	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
2e5061e4	192	machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3 CB	193	else
92e6ecf3 CB	194	machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	195	}
ab14de6c HC	196
ab14de6c HC	197	static __init void early_pgm_check_handler(void)
	198	{
	199	unsigned long addr;
	200	const struct exception_table_entry *fixup;
	201
	202	addr = S390_lowcore.program_old_psw.addr;
	203	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	204	if (!fixup)
	205	disabled_wait(0);
	206	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	207	}
	208
	209	static noinline __init void setup_lowcore_early(void)
	210	{
	211	psw_t psw;
	212
	213	psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
	214	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	215	S390_lowcore.external_new_psw = psw;
	216	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	217	S390_lowcore.program_new_psw = psw;
	218	s390_base_pgm_handler_fn = early_pgm_check_handler;
	219	}
	220
53492b1d GS	221	static noinline __init void setup_hpage(void)
	222	{
	223	#ifndef CONFIG_DEBUG_PAGEALLOC
	224	unsigned int facilities;
	225
	226	facilities = stfl();
	227	if (!(facilities & (1UL << 23)) \|\| !(facilities & (1UL << 29)))
	228	return;
	229	machine_flags \|= MACHINE_FLAG_HPAGE;
	230	__ctl_set_bit(0, 23);
	231	#endif
	232	}
	233
2e5061e4 HC	234	static __init void detect_mvpg(void)
	235	{
	236	#ifndef CONFIG_64BIT
	237	int rc;
	238
	239	asm volatile(
	240	" la 0,0\n"
	241	" mvpg %2,%2\n"
	242	"0: la %0,0\n"
	243	"1:\n"
	244	EX_TABLE(0b,1b)
	245	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	246	if (!rc)
	247	machine_flags \|= MACHINE_FLAG_MVPG;
	248	#endif
	249	}
	250
	251	static __init void detect_ieee(void)
	252	{
	253	#ifndef CONFIG_64BIT
	254	int rc, tmp;
	255
	256	asm volatile(
	257	" efpc %1,0\n"
	258	"0: la %0,0\n"
	259	"1:\n"
	260	EX_TABLE(0b,1b)
	261	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	262	if (!rc)
	263	machine_flags \|= MACHINE_FLAG_IEEE;
	264	#endif
	265	}
	266
	267	static __init void detect_csp(void)
	268	{
	269	#ifndef CONFIG_64BIT
	270	int rc;
	271
	272	asm volatile(
	273	" la 0,0\n"
	274	" la 1,0\n"
	275	" la 2,4\n"
	276	" csp 0,2\n"
	277	"0: la %0,0\n"
	278	"1:\n"
	279	EX_TABLE(0b,1b)
	280	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	281	if (!rc)
	282	machine_flags \|= MACHINE_FLAG_CSP;
	283	#endif
	284	}
	285
	286	static __init void detect_diag9c(void)
	287	{
	288	unsigned int cpu_address;
	289	int rc;
	290
	291	cpu_address = stap();
	292	asm volatile(
	293	" diag %2,0,0x9c\n"
	294	"0: la %0,0\n"
	295	"1:\n"
	296	EX_TABLE(0b,1b)
	297	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
298	if (!rc)
299	machine_flags \|= MACHINE_FLAG_DIAG9C;
300	}
301
302	static __init void detect_diag44(void)
303	{
304	#ifdef CONFIG_64BIT
305	int rc;
306
307	asm volatile(
308	" diag 0,0,0x44\n"
309	"0: la %0,0\n"
310	"1:\n"
311	EX_TABLE(0b,1b)
312	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
313	if (!rc)
314	machine_flags \|= MACHINE_FLAG_DIAG44;
315	#endif
316	}
317
318	static __init void detect_machine_facilities(void)
319	{
320	#ifdef CONFIG_64BIT
321	unsigned int facilities;
322
323	facilities = stfl();
324	if (facilities & (1 << 28))
325	machine_flags \|= MACHINE_FLAG_IDTE;
53492b1d GS	326	if (facilities & (1 << 23))
53492b1d GS	327	machine_flags \|= MACHINE_FLAG_PFMF;
2e5061e4 HC	328	if (facilities & (1 << 4))
	329	machine_flags \|= MACHINE_FLAG_MVCOS;
	330	#endif
	331	}
	332
761cdf6a HC	333	static __init void rescue_initrd(void)
	334	{
	335	#ifdef CONFIG_BLK_DEV_INITRD
	336	/*
	337	* Move the initrd right behind the bss section in case it starts
	338	* within the bss section. So we don't overwrite it when the bss
	339	* section gets cleared.
	340	*/
	341	if (!INITRD_START \|\| !INITRD_SIZE)
	342	return;
	343	if (INITRD_START >= (unsigned long) __bss_stop)
	344	return;
	345	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	346	INITRD_START = (unsigned long) __bss_stop;
	347	#endif
	348	}
	349
a0443fbb HB	350	/* Set up boot command line */
	351	static void __init setup_boot_command_line(void)
	352	{
	353	char *parm = NULL;
	354
	355	/* copy arch command line */
	356	strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	357
	358	/* append IPL PARM data to the boot command line */
	359	if (MACHINE_IS_VM) {
	360	parm = boot_command_line + strlen(boot_command_line);
	361	*parm++ = ' ';
	362	get_ipl_vmparm(parm);
	363	if (parm[0] == '=')
	364	memmove(boot_command_line, parm + 1, strlen(parm));
	365	}
	366	}
	367
	368
ab14de6c HC	369	/*
	370	* Save ipl parameters, clear bss memory, initialize storage keys
	371	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	372	*/
	373	void __init startup_init(void)
	374	{
ab14de6c	375	ipl_save_parameters();
761cdf6a	376	rescue_initrd();
ab14de6c HC	377	clear_bss_section();
	378	init_kernel_storage_key();
	379	lockdep_init();
	380	lockdep_off();
ab14de6c HC	381	sort_main_extable();
ab14de6c HC	382	setup_lowcore_early();
a0443fbb HB	383	detect_machine_type();
	384	ipl_update_parameters();
	385	setup_boot_command_line();
	386	create_kernel_nss();
2e5061e4 HC	387	detect_mvpg();
	388	detect_ieee();
	389	detect_csp();
	390	detect_diag9c();
	391	detect_diag44();
	392	detect_machine_facilities();
53492b1d	393	setup_hpage();
83119ad4	394	sclp_facilities_detect();
23d17421	395	detect_memory_layout(memory_chunk);
25097bf1	396	S390_lowcore.machine_flags = machine_flags;
ab14de6c HC	397	lockdep_on();
ab14de6c HC	398	}