[mirror_ubuntu-hirsute-kernel.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/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/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 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 noinline __init void detect_machine_type(void)
{
	struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;

	get_cpu_id(&S390_lowcore.cpu_data.cpu_id);

	/* Running under z/VM ? */
	if (cpuinfo->cpu_id.version == 0xff)
		machine_flags |= MACHINE_FLAG_VM;

	/* Running under KVM ? */
	if (cpuinfo->cpu_id.version == 0xfe)
		machine_flags |= MACHINE_FLAG_KVM;
}

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);
	boot_command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0;

	/* 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);
	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
	9	#include <linux/init.h>
	10	#include <linux/errno.h>
	11	#include <linux/string.h>
	12	#include <linux/ctype.h>
	13	#include <linux/lockdep.h>
	14	#include <linux/module.h>
	15	#include <linux/pfn.h>
	16	#include <linux/uaccess.h>
a0443fbb	17	#include <asm/ebcdic.h>
46b05d26	18	#include <asm/ipl.h>
ab14de6c HC	19	#include <asm/lowcore.h>
	20	#include <asm/processor.h>
	21	#include <asm/sections.h>
	22	#include <asm/setup.h>
	23	#include <asm/cpcmd.h>
	24	#include <asm/sclp.h>
a806170e	25	#include "entry.h"
ab14de6c HC	26
	27	/*
	28	* Create a Kernel NSS if the SAVESYS= parameter is defined
	29	*/
a0443fbb	30	#define DEFSYS_CMD_SIZE 128
ab14de6c HC	31	#define SAVESYS_CMD_SIZE 32
ab14de6c HC	32
ab14de6c HC	33	char kernel_nss_name[NSS_NAME_SIZE + 1];
ab14de6c HC	34
a0443fbb HB	35	static void __init setup_boot_command_line(void);
	36
	37
ab14de6c	38	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	39	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	40
	41	asm(
	42	" .section .init.text,\"ax\",@progbits\n"
	43	" .align 4\n"
	44	" .type savesys_ipl_nss, @function\n"
	45	"savesys_ipl_nss:\n"
	46	#ifdef CONFIG_64BIT
	47	" stmg 6,15,48(15)\n"
	48	" lgr 14,3\n"
	49	" sam31\n"
	50	" diag 2,14,0x8\n"
	51	" sam64\n"
	52	" lgr 2,14\n"
	53	" lmg 6,15,48(15)\n"
	54	#else
	55	" stm 6,15,24(15)\n"
	56	" lr 14,3\n"
	57	" diag 2,14,0x8\n"
	58	" lr 2,14\n"
	59	" lm 6,15,24(15)\n"
	60	#endif
	61	" br 14\n"
	62	" .size savesys_ipl_nss, .-savesys_ipl_nss\n");
	63
ab14de6c HC	64	static noinline __init void create_kernel_nss(void)
	65	{
	66	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	67	#ifdef CONFIG_BLK_DEV_INITRD
	68	unsigned int sinitrd_pfn, einitrd_pfn;
	69	#endif
	70	int response;
a0443fbb	71	size_t len;
ab14de6c HC	72	char *savesys_ptr;
	73	char upper_command_line[COMMAND_LINE_SIZE];
	74	char defsys_cmd[DEFSYS_CMD_SIZE];
	75	char savesys_cmd[SAVESYS_CMD_SIZE];
	76
	77	/* Do nothing if we are not running under VM */
	78	if (!MACHINE_IS_VM)
	79	return;
	80
	81	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	82	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	83	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	84
	85	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	86
	87	if (!savesys_ptr)
	88	return;
	89
	90	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	91	for (i = 0; i < NSS_NAME_SIZE; i++) {
	92	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	93	break;
	94	kernel_nss_name[i] = savesys_ptr[i];
	95	}
	96
	97	stext_pfn = PFN_DOWN(__pa(&_stext));
	98	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	99	end_pfn = PFN_UP(__pa(&_end));
	100	min_size = end_pfn << 2;
	101
	102	sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	103	kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
	104	eshared_pfn, end_pfn);
	105
	106	#ifdef CONFIG_BLK_DEV_INITRD
	107	if (INITRD_START && INITRD_SIZE) {
	108	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	109	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	110	min_size = einitrd_pfn << 2;
	111	sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
	112	sinitrd_pfn, einitrd_pfn);
	113	}
	114	#endif
	115
a0443fbb HB	116	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
a0443fbb HB	117	defsys_cmd, min_size);
ab14de6c HC	118	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
	119	kernel_nss_name, kernel_nss_name);
	120
	121	__cpcmd(defsys_cmd, NULL, 0, &response);
	122
583b33bc HY	123	if (response != 0) {
583b33bc HY	124	kernel_nss_name[0] = '\0';
ab14de6c	125	return;
583b33bc	126	}
ab14de6c	127
a0443fbb HB	128	len = strlen(savesys_cmd);
	129	ASCEBC(savesys_cmd, len);
	130	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	131
a0443fbb HB	132	/* On success: response is equal to the command size,
	133	* max SAVESYS_CMD_SIZE
	134	* On error: response contains the numeric portion of cp error message.
	135	* for SAVESYS it will be >= 263
	136	*/
	137	if (response > SAVESYS_CMD_SIZE) {
583b33bc	138	kernel_nss_name[0] = '\0';
ab14de6c	139	return;
583b33bc	140	}
ab14de6c	141
a0443fbb HB	142	/* re-setup boot command line with new ipl vm parms */
	143	ipl_update_parameters();
	144	setup_boot_command_line();
	145
ab14de6c HC	146	ipl_flags = IPL_NSS_VALID;
	147	}
	148
	149	#else /* CONFIG_SHARED_KERNEL */
	150
	151	static inline void create_kernel_nss(void) { }
	152
	153	#endif /* CONFIG_SHARED_KERNEL */
	154
	155	/*
	156	* Clear bss memory
	157	*/
	158	static noinline __init void clear_bss_section(void)
	159	{
229d9c6d	160	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	161	}
	162
	163	/*
	164	* Initialize storage key for kernel pages
	165	*/
	166	static noinline __init void init_kernel_storage_key(void)
	167	{
	168	unsigned long end_pfn, init_pfn;
	169
	170	end_pfn = PFN_UP(__pa(&_end));
	171
	172	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
	173	page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
	174	}
	175
	176	static noinline __init void detect_machine_type(void)
	177	{
	178	struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
	179
72960a02	180	get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
ab14de6c HC	181
	182	/* Running under z/VM ? */
	183	if (cpuinfo->cpu_id.version == 0xff)
2e5061e4	184	machine_flags \|= MACHINE_FLAG_VM;
ab14de6c	185
fa587743 CO	186	/* Running under KVM ? */
fa587743 CO	187	if (cpuinfo->cpu_id.version == 0xfe)
2e5061e4	188	machine_flags \|= MACHINE_FLAG_KVM;
ab14de6c HC	189	}
ab14de6c HC	190
ab14de6c HC	191	static __init void early_pgm_check_handler(void)
	192	{
	193	unsigned long addr;
	194	const struct exception_table_entry *fixup;
	195
	196	addr = S390_lowcore.program_old_psw.addr;
	197	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	198	if (!fixup)
	199	disabled_wait(0);
	200	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	201	}
	202
	203	static noinline __init void setup_lowcore_early(void)
	204	{
	205	psw_t psw;
	206
	207	psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
	208	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	209	S390_lowcore.external_new_psw = psw;
	210	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	211	S390_lowcore.program_new_psw = psw;
	212	s390_base_pgm_handler_fn = early_pgm_check_handler;
	213	}
	214
53492b1d GS	215	static noinline __init void setup_hpage(void)
	216	{
	217	#ifndef CONFIG_DEBUG_PAGEALLOC
	218	unsigned int facilities;
	219
	220	facilities = stfl();
	221	if (!(facilities & (1UL << 23)) \|\| !(facilities & (1UL << 29)))
	222	return;
	223	machine_flags \|= MACHINE_FLAG_HPAGE;
	224	__ctl_set_bit(0, 23);
	225	#endif
	226	}
	227
2e5061e4 HC	228	static __init void detect_mvpg(void)
	229	{
	230	#ifndef CONFIG_64BIT
	231	int rc;
	232
	233	asm volatile(
	234	" la 0,0\n"
	235	" mvpg %2,%2\n"
	236	"0: la %0,0\n"
	237	"1:\n"
	238	EX_TABLE(0b,1b)
	239	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	240	if (!rc)
	241	machine_flags \|= MACHINE_FLAG_MVPG;
	242	#endif
	243	}
	244
	245	static __init void detect_ieee(void)
	246	{
	247	#ifndef CONFIG_64BIT
	248	int rc, tmp;
	249
	250	asm volatile(
	251	" efpc %1,0\n"
	252	"0: la %0,0\n"
	253	"1:\n"
	254	EX_TABLE(0b,1b)
	255	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	256	if (!rc)
	257	machine_flags \|= MACHINE_FLAG_IEEE;
	258	#endif
	259	}
	260
	261	static __init void detect_csp(void)
	262	{
	263	#ifndef CONFIG_64BIT
	264	int rc;
	265
	266	asm volatile(
	267	" la 0,0\n"
	268	" la 1,0\n"
	269	" la 2,4\n"
	270	" csp 0,2\n"
	271	"0: la %0,0\n"
	272	"1:\n"
	273	EX_TABLE(0b,1b)
	274	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	275	if (!rc)
	276	machine_flags \|= MACHINE_FLAG_CSP;
	277	#endif
	278	}
	279
	280	static __init void detect_diag9c(void)
	281	{
	282	unsigned int cpu_address;
	283	int rc;
	284
	285	cpu_address = stap();
	286	asm volatile(
	287	" diag %2,0,0x9c\n"
	288	"0: la %0,0\n"
	289	"1:\n"
	290	EX_TABLE(0b,1b)
	291	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
292	if (!rc)
293	machine_flags \|= MACHINE_FLAG_DIAG9C;
294	}
295
296	static __init void detect_diag44(void)
297	{
298	#ifdef CONFIG_64BIT
299	int rc;
300
301	asm volatile(
302	" diag 0,0,0x44\n"
303	"0: la %0,0\n"
304	"1:\n"
305	EX_TABLE(0b,1b)
306	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
307	if (!rc)
308	machine_flags \|= MACHINE_FLAG_DIAG44;
309	#endif
310	}
311
312	static __init void detect_machine_facilities(void)
313	{
314	#ifdef CONFIG_64BIT
315	unsigned int facilities;
316
317	facilities = stfl();
318	if (facilities & (1 << 28))
319	machine_flags \|= MACHINE_FLAG_IDTE;
53492b1d GS	320	if (facilities & (1 << 23))
53492b1d GS	321	machine_flags \|= MACHINE_FLAG_PFMF;
2e5061e4 HC	322	if (facilities & (1 << 4))
	323	machine_flags \|= MACHINE_FLAG_MVCOS;
	324	#endif
	325	}
	326
761cdf6a HC	327	static __init void rescue_initrd(void)
	328	{
	329	#ifdef CONFIG_BLK_DEV_INITRD
	330	/*
	331	* Move the initrd right behind the bss section in case it starts
	332	* within the bss section. So we don't overwrite it when the bss
	333	* section gets cleared.
	334	*/
	335	if (!INITRD_START \|\| !INITRD_SIZE)
	336	return;
	337	if (INITRD_START >= (unsigned long) __bss_stop)
	338	return;
	339	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	340	INITRD_START = (unsigned long) __bss_stop;
	341	#endif
	342	}
	343
a0443fbb HB	344	/* Set up boot command line */
	345	static void __init setup_boot_command_line(void)
	346	{
	347	char *parm = NULL;
	348
	349	/* copy arch command line */
	350	strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
	351	boot_command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	352
	353	/* append IPL PARM data to the boot command line */
	354	if (MACHINE_IS_VM) {
	355	parm = boot_command_line + strlen(boot_command_line);
	356	*parm++ = ' ';
	357	get_ipl_vmparm(parm);
	358	if (parm[0] == '=')
	359	memmove(boot_command_line, parm + 1, strlen(parm));
	360	}
	361	}
	362
	363
ab14de6c HC	364	/*
	365	* Save ipl parameters, clear bss memory, initialize storage keys
	366	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	367	*/
	368	void __init startup_init(void)
	369	{
ab14de6c	370	ipl_save_parameters();
761cdf6a	371	rescue_initrd();
ab14de6c HC	372	clear_bss_section();
	373	init_kernel_storage_key();
	374	lockdep_init();
	375	lockdep_off();
ab14de6c HC	376	sort_main_extable();
ab14de6c HC	377	setup_lowcore_early();
a0443fbb HB	378	detect_machine_type();
	379	ipl_update_parameters();
	380	setup_boot_command_line();
	381	create_kernel_nss();
2e5061e4 HC	382	detect_mvpg();
	383	detect_ieee();
	384	detect_csp();
	385	detect_diag9c();
	386	detect_diag44();
	387	detect_machine_facilities();
53492b1d	388	setup_hpage();
83119ad4	389	sclp_facilities_detect();
23d17421	390	detect_memory_layout(memory_chunk);
ab14de6c HC	391	lockdep_on();
ab14de6c HC	392	}