[mirror_ubuntu-hirsute-kernel.git] / arch / s390 / kernel / early.c

// SPDX-License-Identifier: GPL-2.0
/*
 *    Copyright IBM Corp. 2007, 2009
 *    Author(s): Hongjie Yang <hongjie@us.ibm.com>,
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#define KMSG_COMPONENT "setup"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#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/extable.h>
#include <linux/pfn.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <asm/diag.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 <asm/facility.h>
#include <asm/boot_data.h>
#include <asm/switch_to.h>
#include "entry.h"

static void __init reset_tod_clock(void)
{
	u64 time;

	if (store_tod_clock(&time) == 0)
		return;
	/* TOD clock not running. Set the clock to Unix Epoch. */
	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 || store_tod_clock(&time) != 0)
		disabled_wait();

	memset(tod_clock_base, 0, 16);
	*(__u64 *) &tod_clock_base[1] = TOD_UNIX_EPOCH;
	S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
}

/*
 * Initialize storage key for kernel pages
 */
static noinline __init void init_kernel_storage_key(void)
{
#if PAGE_DEFAULT_KEY
	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, 0);
#endif
}

static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);

static noinline __init void detect_machine_type(void)
{
	struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;

	/* Check current-configuration-level */
	if (stsi(NULL, 0, 0, 0) <= 2) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
		return;
	}
	/* Get virtual-machine cpu information. */
	if (stsi(vmms, 3, 2, 2) || !vmms->count)
		return;

	/* Detect known hypervisors */
	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
	else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
		S390_lowcore.machine_flags |= MACHINE_FLAG_VM;
}

/* Remove leading, trailing and double whitespace. */
static inline void strim_all(char *str)
{
	char *s;

	s = strim(str);
	if (s != str)
		memmove(str, s, strlen(s));
	while (*str) {
		if (!isspace(*str++))
			continue;
		if (isspace(*str)) {
			s = skip_spaces(str);
			memmove(str, s, strlen(s) + 1);
		}
	}
}

static noinline __init void setup_arch_string(void)
{
	struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
	struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
	char mstr[80], hvstr[17];

	if (stsi(mach, 1, 1, 1))
		return;
	EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
	EBCASC(mach->type, sizeof(mach->type));
	EBCASC(mach->model, sizeof(mach->model));
	EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
	sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
		mach->manufacturer, mach->type,
		mach->model, mach->model_capacity);
	strim_all(mstr);
	if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
		EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
		sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
		strim_all(hvstr);
	} else {
		sprintf(hvstr, "%s",
			MACHINE_IS_LPAR ? "LPAR" :
			MACHINE_IS_VM ? "z/VM" :
			MACHINE_IS_KVM ? "KVM" : "unknown");
	}
	dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
}

static __init void setup_topology(void)
{
	int max_mnest;

	if (!test_facility(11))
		return;
	S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
		if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
			break;
	}
	topology_max_mnest = max_mnest;
}

static void early_pgm_check_handler(void)
{
	const struct exception_table_entry *fixup;
	unsigned long cr0, cr0_new;
	unsigned long addr;

	addr = S390_lowcore.program_old_psw.addr;
	fixup = s390_search_extables(addr);
	if (!fixup)
		disabled_wait();
	/* Disable low address protection before storing into lowcore. */
	__ctl_store(cr0, 0, 0);
	cr0_new = cr0 & ~(1UL << 28);
	__ctl_load(cr0_new, 0, 0);
	S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
	__ctl_load(cr0, 0, 0);
}

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

	psw.addr = (unsigned long)s390_base_pgm_handler;
	psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
	if (IS_ENABLED(CONFIG_KASAN))
		psw.mask |= PSW_MASK_DAT;
	S390_lowcore.program_new_psw = psw;
	s390_base_pgm_handler_fn = early_pgm_check_handler;
	S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
}

static noinline __init void setup_facility_list(void)
{
	memcpy(S390_lowcore.alt_stfle_fac_list,
	       S390_lowcore.stfle_fac_list,
	       sizeof(S390_lowcore.alt_stfle_fac_list));
	if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
		__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
}

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

	cpu_address = stap();
	diag_stat_inc(DIAG_STAT_X09C);
	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)
		S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
}

static __init void detect_machine_facilities(void)
{
	if (test_facility(8)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
		__ctl_set_bit(0, 23);
	}
	if (test_facility(78))
		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
	if (test_facility(3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
	if (test_facility(50) && test_facility(73)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
		__ctl_set_bit(0, 55);
	}
	if (test_facility(51))
		S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
	if (test_facility(129)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
		__ctl_set_bit(0, 17);
	}
	if (test_facility(130) && !noexec_disabled) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
		__ctl_set_bit(0, 20);
	}
	if (test_facility(133))
		S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
	if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
		/* Enabled signed clock comparator comparisons */
		S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
		clock_comparator_max = -1ULL >> 1;
		__ctl_set_bit(0, 53);
	}
}

static inline void save_vector_registers(void)
{
#ifdef CONFIG_CRASH_DUMP
	if (test_facility(129))
		save_vx_regs(boot_cpu_vector_save_area);
#endif
}

static inline void setup_control_registers(void)
{
	unsigned long reg;

	__ctl_store(reg, 0, 0);
	reg |= CR0_LOW_ADDRESS_PROTECTION;
	reg |= CR0_EMERGENCY_SIGNAL_SUBMASK;
	reg |= CR0_EXTERNAL_CALL_SUBMASK;
	__ctl_load(reg, 0, 0);
}

static inline void setup_access_registers(void)
{
	unsigned int acrs[NUM_ACRS] = { 0 };

	restore_access_regs(acrs);
}

static int __init disable_vector_extension(char *str)
{
	S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
	__ctl_clear_bit(0, 17);
	return 0;
}
early_param("novx", disable_vector_extension);

char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
static void __init setup_boot_command_line(void)
{
	/* copy arch command line */
	strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
}

static void __init check_image_bootable(void)
{
	if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
		return;

	sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
	sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
	sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
	disabled_wait();
}

void __init startup_init(void)
{
	reset_tod_clock();
	check_image_bootable();
	time_early_init();
	init_kernel_storage_key();
	lockdep_off();
	setup_lowcore_early();
	setup_facility_list();
	detect_machine_type();
	setup_arch_string();
	setup_boot_command_line();
	detect_diag9c();
	detect_machine_facilities();
	save_vector_registers();
	setup_topology();
	sclp_early_detect();
	setup_control_registers();
	setup_access_registers();
	lockdep_on();
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
ab14de6c	2	/*
155af2f9	3	* Copyright IBM Corp. 2007, 2009
ab14de6c HC	4	* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
	5	* Heiko Carstens <heiko.carstens@de.ibm.com>
	6	*/
	7
11af97e1 HB	8	#define KMSG_COMPONENT "setup"
	9	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	10
92e6ecf3	11	#include <linux/compiler.h>
ab14de6c HC	12	#include <linux/init.h>
	13	#include <linux/errno.h>
	14	#include <linux/string.h>
	15	#include <linux/ctype.h>
	16	#include <linux/lockdep.h>
dcc096c5	17	#include <linux/extable.h>
ab14de6c HC	18	#include <linux/pfn.h>
ab14de6c HC	19	#include <linux/uaccess.h>
11af97e1	20	#include <linux/kernel.h>
1ec2772e	21	#include <asm/diag.h>
a0443fbb	22	#include <asm/ebcdic.h>
46b05d26	23	#include <asm/ipl.h>
ab14de6c HC	24	#include <asm/lowcore.h>
	25	#include <asm/processor.h>
	26	#include <asm/sections.h>
	27	#include <asm/setup.h>
92e6ecf3	28	#include <asm/sysinfo.h>
ab14de6c HC	29	#include <asm/cpcmd.h>
ab14de6c HC	30	#include <asm/sclp.h>
a0616cde	31	#include <asm/facility.h>
49698745	32	#include <asm/boot_data.h>
c2313594	33	#include <asm/switch_to.h>
a806170e	34	#include "entry.h"
ab14de6c	35
2e83e0eb VG	36	static void __init reset_tod_clock(void)
	37	{
	38	u64 time;
	39
	40	if (store_tod_clock(&time) == 0)
	41	return;
	42	/* TOD clock not running. Set the clock to Unix Epoch. */
	43	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 \|\| store_tod_clock(&time) != 0)
	44	disabled_wait();
	45
	46	memset(tod_clock_base, 0, 16);
	47	(__u64 ) &tod_clock_base[1] = TOD_UNIX_EPOCH;
	48	S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
	49	}
	50
ab14de6c HC	51	/*
	52	* Initialize storage key for kernel pages
	53	*/
	54	static noinline __init void init_kernel_storage_key(void)
	55	{
127c1fef	56	#if PAGE_DEFAULT_KEY
ab14de6c HC	57	unsigned long end_pfn, init_pfn;
ab14de6c HC	58
320d9555	59	end_pfn = PFN_UP(__pa(_end));
ab14de6c HC	60
ab14de6c HC	61	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	62	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	63	PAGE_DEFAULT_KEY, 0);
127c1fef	64	#endif
ab14de6c HC	65	}
ab14de6c HC	66
fade4dc4	67	static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
92e6ecf3	68
ab14de6c HC	69	static noinline __init void detect_machine_type(void)
ab14de6c HC	70	{
fade4dc4 HC	71	struct sysinfo_3_2_2 vmms = (struct sysinfo_3_2_2 )&sysinfo_page;
fade4dc4 HC	72
27d71602	73	/* Check current-configuration-level */
caf757c6	74	if (stsi(NULL, 0, 0, 0) <= 2) {
27d71602	75	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	76	return;
27d71602 MS	77	}
27d71602 MS	78	/* Get virtual-machine cpu information. */
caf757c6	79	if (stsi(vmms, 3, 2, 2) \|\| !vmms->count)
92e6ecf3	80	return;
ab14de6c	81
03aa047e	82	/* Detect known hypervisors */
fade4dc4	83	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	84	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
03aa047e	85	else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
d3135e0c	86	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	87	}
ab14de6c HC	88
d2f03974 HC	89	/* Remove leading, trailing and double whitespace. */
	90	static inline void strim_all(char *str)
	91	{
	92	char *s;
	93
	94	s = strim(str);
	95	if (s != str)
	96	memmove(str, s, strlen(s));
	97	while (*str) {
	98	if (!isspace(*str++))
	99	continue;
	100	if (isspace(*str)) {
	101	s = skip_spaces(str);
	102	memmove(str, s, strlen(s) + 1);
	103	}
	104	}
	105	}
	106
4b8fe77a CB	107	static noinline __init void setup_arch_string(void)
	108	{
	109	struct sysinfo_1_1_1 mach = (struct sysinfo_1_1_1 )&sysinfo_page;
2f8876f9 HC	110	struct sysinfo_3_2_2 vm = (struct sysinfo_3_2_2 )&sysinfo_page;
2f8876f9 HC	111	char mstr[80], hvstr[17];
4b8fe77a CB	112
	113	if (stsi(mach, 1, 1, 1))
	114	return;
	115	EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
	116	EBCASC(mach->type, sizeof(mach->type));
	117	EBCASC(mach->model, sizeof(mach->model));
	118	EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
d2f03974 HC	119	sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
	120	mach->manufacturer, mach->type,
	121	mach->model, mach->model_capacity);
	122	strim_all(mstr);
2f8876f9 HC	123	if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
	124	EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
	125	sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
	126	strim_all(hvstr);
	127	} else {
	128	sprintf(hvstr, "%s",
	129	MACHINE_IS_LPAR ? "LPAR" :
	130	MACHINE_IS_VM ? "z/VM" :
	131	MACHINE_IS_KVM ? "KVM" : "unknown");
	132	}
	133	dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
4b8fe77a CB	134	}
4b8fe77a CB	135
fade4dc4 HC	136	static __init void setup_topology(void)
fade4dc4 HC	137	{
fade4dc4 HC	138	int max_mnest;
	139
	140	if (!test_facility(11))
	141	return;
	142	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
	143	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
caf757c6	144	if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
fade4dc4 HC	145	break;
	146	}
	147	topology_max_mnest = max_mnest;
fade4dc4 HC	148	}
fade4dc4 HC	149
a3415703	150	static void early_pgm_check_handler(void)
ab14de6c	151	{
ab14de6c	152	const struct exception_table_entry *fixup;
50be6345	153	unsigned long cr0, cr0_new;
eb608fb3	154	unsigned long addr;
ab14de6c HC	155
ab14de6c HC	156	addr = S390_lowcore.program_old_psw.addr;
a80313ff	157	fixup = s390_search_extables(addr);
ab14de6c	158	if (!fixup)
98587c2d	159	disabled_wait();
50be6345 PH	160	/* Disable low address protection before storing into lowcore. */
	161	__ctl_store(cr0, 0, 0);
	162	cr0_new = cr0 & ~(1UL << 28);
	163	__ctl_load(cr0_new, 0, 0);
fecc868a	164	S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
50be6345	165	__ctl_load(cr0, 0, 0);
ab14de6c HC	166	}
ab14de6c HC	167
5f954c34	168	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	169	{
	170	psw_t psw;
	171
f38b0a74	172	psw.addr = (unsigned long)s390_base_pgm_handler;
b50511e4	173	psw.mask = PSW_MASK_BASE \| PSW_DEFAULT_KEY \| PSW_MASK_EA \| PSW_MASK_BA;
998f5bbe VG	174	if (IS_ENABLED(CONFIG_KASAN))
998f5bbe VG	175	psw.mask \|= PSW_MASK_DAT;
ab14de6c HC	176	S390_lowcore.program_new_psw = psw;
ab14de6c HC	177	s390_base_pgm_handler_fn = early_pgm_check_handler;
c360192b	178	S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
ab14de6c HC	179	}
ab14de6c HC	180
14375bc4 MS	181	static noinline __init void setup_facility_list(void)
14375bc4 MS	182	{
cf148998 MS	183	memcpy(S390_lowcore.alt_stfle_fac_list,
	184	S390_lowcore.stfle_fac_list,
	185	sizeof(S390_lowcore.alt_stfle_fac_list));
d768bd89 MS	186	if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
d768bd89 MS	187	__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
14375bc4 MS	188	}
14375bc4 MS	189
2e5061e4 HC	190	static __init void detect_diag9c(void)
	191	{
	192	unsigned int cpu_address;
	193	int rc;
	194
	195	cpu_address = stap();
1ec2772e	196	diag_stat_inc(DIAG_STAT_X09C);
2e5061e4 HC	197	asm volatile(
	198	" diag %2,0,0x9c\n"
	199	"0: la %0,0\n"
	200	"1:\n"
	201	EX_TABLE(0b,1b)
	202	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	203	if (!rc)
d3135e0c	204	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	205	}
2e5061e4 HC	206
2e5061e4 HC	207	static __init void detect_machine_facilities(void)
2e5061e4 HC	208	{
3c7ef08b HC	209	if (test_facility(8)) {
	210	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT1;
	211	__ctl_set_bit(0, 23);
	212	}
85e9d0e5 HC	213	if (test_facility(78))
85e9d0e5 HC	214	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT2;
14375bc4	215	if (test_facility(3))
d3135e0c	216	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
a1c5befc	217	if (test_facility(50) && test_facility(73)) {
d35339a4	218	S390_lowcore.machine_flags \|= MACHINE_FLAG_TE;
a1c5befc HC	219	__ctl_set_bit(0, 55);
a1c5befc HC	220	}
1b948d6c MS	221	if (test_facility(51))
1b948d6c MS	222	S390_lowcore.machine_flags \|= MACHINE_FLAG_TLB_LC;
b5510d9b	223	if (test_facility(129)) {
80703617	224	S390_lowcore.machine_flags \|= MACHINE_FLAG_VX;
b5510d9b HB	225	__ctl_set_bit(0, 17);
b5510d9b HB	226	}
d3baaeb5	227	if (test_facility(130) && !noexec_disabled) {
57d7f939 MS	228	S390_lowcore.machine_flags \|= MACHINE_FLAG_NX;
	229	__ctl_set_bit(0, 20);
	230	}
916cda1a MS	231	if (test_facility(133))
916cda1a MS	232	S390_lowcore.machine_flags \|= MACHINE_FLAG_GS;
6e2ef5e4 MS	233	if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
	234	/* Enabled signed clock comparator comparisons */
	235	S390_lowcore.machine_flags \|= MACHINE_FLAG_SCC;
	236	clock_comparator_max = -1ULL >> 1;
	237	__ctl_set_bit(0, 53);
	238	}
b5510d9b HB	239	}
b5510d9b HB	240
1a36a39e MS	241	static inline void save_vector_registers(void)
	242	{
	243	#ifdef CONFIG_CRASH_DUMP
	244	if (test_facility(129))
	245	save_vx_regs(boot_cpu_vector_save_area);
	246	#endif
	247	}
	248
c02ee6a1 VG	249	static inline void setup_control_registers(void)
	250	{
	251	unsigned long reg;
	252
	253	__ctl_store(reg, 0, 0);
	254	reg \|= CR0_LOW_ADDRESS_PROTECTION;
	255	reg \|= CR0_EMERGENCY_SIGNAL_SUBMASK;
	256	reg \|= CR0_EXTERNAL_CALL_SUBMASK;
	257	__ctl_load(reg, 0, 0);
	258	}
	259
c2313594 VG	260	static inline void setup_access_registers(void)
	261	{
	262	unsigned int acrs[NUM_ACRS] = { 0 };
	263
	264	restore_access_regs(acrs);
	265	}
	266
b5510d9b HB	267	static int __init disable_vector_extension(char *str)
	268	{
	269	S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
	270	__ctl_clear_bit(0, 17);
673cfddf	271	return 0;
2e5061e4	272	}
b5510d9b	273	early_param("novx", disable_vector_extension);
2e5061e4	274
49698745	275	char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
1fb81057 MH	276	static void __init setup_boot_command_line(void)
1fb81057 MH	277	{
a0443fbb	278	/* copy arch command line */
49698745	279	strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	280	}
a0443fbb HB	281
627c9b62 VG	282	static void __init check_image_bootable(void)
	283	{
	284	if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
	285	return;
	286
	287	sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
	288	sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
	289	sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
98587c2d	290	disabled_wait();
627c9b62 VG	291	}
627c9b62 VG	292
ab14de6c HC	293	void __init startup_init(void)
ab14de6c HC	294	{
2e83e0eb	295	reset_tod_clock();
627c9b62	296	check_image_bootable();
b1c0854d	297	time_early_init();
ab14de6c	298	init_kernel_storage_key();
ab14de6c	299	lockdep_off();
ab14de6c	300	setup_lowcore_early();
14375bc4	301	setup_facility_list();
a0443fbb	302	detect_machine_type();
4b8fe77a	303	setup_arch_string();
a0443fbb	304	setup_boot_command_line();
2e5061e4	305	detect_diag9c();
2e5061e4	306	detect_machine_facilities();
1a36a39e	307	save_vector_registers();
fade4dc4	308	setup_topology();
7b50da53	309	sclp_early_detect();
c02ee6a1	310	setup_control_registers();
c2313594	311	setup_access_registers();
ab14de6c HC	312	lockdep_on();
ab14de6c HC	313	}