[mirror_ubuntu-eoan-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 "entry.h"

/*
 * 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.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
	psw.addr = (unsigned long) s390_base_ext_handler;
	S390_lowcore.external_new_psw = psw;
	psw.addr = (unsigned long) s390_base_pgm_handler;
	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_diag44(void)
{
	int rc;

	diag_stat_inc(DIAG_STAT_X044);
	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)
		S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
}

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)) {
		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 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);

static int __init noexec_setup(char *str)
{
	bool enabled;
	int rc;

	rc = kstrtobool(str, &enabled);
	if (!rc && !enabled) {
		/* Disable no-execute support */
		S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
		__ctl_clear_bit(0, 20);
	}
	return rc;
}
early_param("noexec", noexec_setup);

static int __init cad_setup(char *str)
{
	bool enabled;
	int rc;

	rc = kstrtobool(str, &enabled);
	if (!rc && enabled && test_facility(128))
		/* Enable problem state CAD. */
		__ctl_set_bit(2, 3);
	return rc;
}
early_param("cad", cad_setup);

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)
{
	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_diag44();
	detect_machine_facilities();
	save_vector_registers();
	setup_topology();
	sclp_early_detect();
	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>
a806170e	33	#include "entry.h"
ab14de6c	34
ab14de6c HC	35	/*
	36	* Initialize storage key for kernel pages
	37	*/
	38	static noinline __init void init_kernel_storage_key(void)
	39	{
127c1fef	40	#if PAGE_DEFAULT_KEY
ab14de6c HC	41	unsigned long end_pfn, init_pfn;
ab14de6c HC	42
320d9555	43	end_pfn = PFN_UP(__pa(_end));
ab14de6c HC	44
ab14de6c HC	45	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	46	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	47	PAGE_DEFAULT_KEY, 0);
127c1fef	48	#endif
ab14de6c HC	49	}
ab14de6c HC	50
fade4dc4	51	static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
92e6ecf3	52
ab14de6c HC	53	static noinline __init void detect_machine_type(void)
ab14de6c HC	54	{
fade4dc4 HC	55	struct sysinfo_3_2_2 vmms = (struct sysinfo_3_2_2 )&sysinfo_page;
fade4dc4 HC	56
27d71602	57	/* Check current-configuration-level */
caf757c6	58	if (stsi(NULL, 0, 0, 0) <= 2) {
27d71602	59	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	60	return;
27d71602 MS	61	}
27d71602 MS	62	/* Get virtual-machine cpu information. */
caf757c6	63	if (stsi(vmms, 3, 2, 2) \|\| !vmms->count)
92e6ecf3	64	return;
ab14de6c	65
03aa047e	66	/* Detect known hypervisors */
fade4dc4	67	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	68	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
03aa047e	69	else if (!memcmp(vmms->vm[0].cpi, "\xa9\x61\xe5\xd4", 4))
d3135e0c	70	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	71	}
ab14de6c HC	72
d2f03974 HC	73	/* Remove leading, trailing and double whitespace. */
	74	static inline void strim_all(char *str)
	75	{
	76	char *s;
	77
	78	s = strim(str);
	79	if (s != str)
	80	memmove(str, s, strlen(s));
	81	while (*str) {
	82	if (!isspace(*str++))
	83	continue;
	84	if (isspace(*str)) {
	85	s = skip_spaces(str);
	86	memmove(str, s, strlen(s) + 1);
	87	}
	88	}
	89	}
	90
4b8fe77a CB	91	static noinline __init void setup_arch_string(void)
	92	{
	93	struct sysinfo_1_1_1 mach = (struct sysinfo_1_1_1 )&sysinfo_page;
2f8876f9 HC	94	struct sysinfo_3_2_2 vm = (struct sysinfo_3_2_2 )&sysinfo_page;
2f8876f9 HC	95	char mstr[80], hvstr[17];
4b8fe77a CB	96
	97	if (stsi(mach, 1, 1, 1))
	98	return;
	99	EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
	100	EBCASC(mach->type, sizeof(mach->type));
	101	EBCASC(mach->model, sizeof(mach->model));
	102	EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
d2f03974 HC	103	sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
	104	mach->manufacturer, mach->type,
	105	mach->model, mach->model_capacity);
	106	strim_all(mstr);
2f8876f9 HC	107	if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
	108	EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
	109	sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
	110	strim_all(hvstr);
	111	} else {
	112	sprintf(hvstr, "%s",
	113	MACHINE_IS_LPAR ? "LPAR" :
	114	MACHINE_IS_VM ? "z/VM" :
	115	MACHINE_IS_KVM ? "KVM" : "unknown");
	116	}
	117	dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
4b8fe77a CB	118	}
4b8fe77a CB	119
fade4dc4 HC	120	static __init void setup_topology(void)
fade4dc4 HC	121	{
fade4dc4 HC	122	int max_mnest;
	123
	124	if (!test_facility(11))
	125	return;
	126	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
	127	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
caf757c6	128	if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
fade4dc4 HC	129	break;
	130	}
	131	topology_max_mnest = max_mnest;
fade4dc4 HC	132	}
fade4dc4 HC	133
a3415703	134	static void early_pgm_check_handler(void)
ab14de6c	135	{
ab14de6c	136	const struct exception_table_entry *fixup;
50be6345	137	unsigned long cr0, cr0_new;
eb608fb3	138	unsigned long addr;
ab14de6c HC	139
ab14de6c HC	140	addr = S390_lowcore.program_old_psw.addr;
a80313ff	141	fixup = s390_search_extables(addr);
ab14de6c	142	if (!fixup)
98587c2d	143	disabled_wait();
50be6345 PH	144	/* Disable low address protection before storing into lowcore. */
	145	__ctl_store(cr0, 0, 0);
	146	cr0_new = cr0 & ~(1UL << 28);
	147	__ctl_load(cr0_new, 0, 0);
fecc868a	148	S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
50be6345	149	__ctl_load(cr0, 0, 0);
ab14de6c HC	150	}
ab14de6c HC	151
5f954c34	152	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	153	{
	154	psw_t psw;
	155
b50511e4	156	psw.mask = PSW_MASK_BASE \| PSW_DEFAULT_KEY \| PSW_MASK_EA \| PSW_MASK_BA;
fecc868a	157	psw.addr = (unsigned long) s390_base_ext_handler;
ab14de6c	158	S390_lowcore.external_new_psw = psw;
fecc868a	159	psw.addr = (unsigned long) s390_base_pgm_handler;
ab14de6c HC	160	S390_lowcore.program_new_psw = psw;
ab14de6c HC	161	s390_base_pgm_handler_fn = early_pgm_check_handler;
c360192b	162	S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
ab14de6c HC	163	}
ab14de6c HC	164
14375bc4 MS	165	static noinline __init void setup_facility_list(void)
14375bc4 MS	166	{
cf148998 MS	167	memcpy(S390_lowcore.alt_stfle_fac_list,
	168	S390_lowcore.stfle_fac_list,
	169	sizeof(S390_lowcore.alt_stfle_fac_list));
d768bd89 MS	170	if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
d768bd89 MS	171	__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
14375bc4 MS	172	}
14375bc4 MS	173
2e5061e4 HC	174	static __init void detect_diag9c(void)
	175	{
	176	unsigned int cpu_address;
	177	int rc;
	178
	179	cpu_address = stap();
1ec2772e	180	diag_stat_inc(DIAG_STAT_X09C);
2e5061e4 HC	181	asm volatile(
	182	" diag %2,0,0x9c\n"
	183	"0: la %0,0\n"
	184	"1:\n"
	185	EX_TABLE(0b,1b)
	186	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	187	if (!rc)
d3135e0c	188	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	189	}
	190
	191	static __init void detect_diag44(void)
	192	{
2e5061e4 HC	193	int rc;
2e5061e4 HC	194
1ec2772e	195	diag_stat_inc(DIAG_STAT_X044);
2e5061e4 HC	196	asm volatile(
	197	" diag 0,0,0x44\n"
	198	"0: la %0,0\n"
	199	"1:\n"
	200	EX_TABLE(0b,1b)
	201	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	202	if (!rc)
d3135e0c	203	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	204	}
	205
	206	static __init void detect_machine_facilities(void)
	207	{
3c7ef08b HC	208	if (test_facility(8)) {
	209	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT1;
	210	__ctl_set_bit(0, 23);
	211	}
85e9d0e5 HC	212	if (test_facility(78))
85e9d0e5 HC	213	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT2;
14375bc4	214	if (test_facility(3))
d3135e0c	215	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
a1c5befc	216	if (test_facility(50) && test_facility(73)) {
d35339a4	217	S390_lowcore.machine_flags \|= MACHINE_FLAG_TE;
a1c5befc HC	218	__ctl_set_bit(0, 55);
a1c5befc HC	219	}
1b948d6c MS	220	if (test_facility(51))
1b948d6c MS	221	S390_lowcore.machine_flags \|= MACHINE_FLAG_TLB_LC;
b5510d9b	222	if (test_facility(129)) {
80703617	223	S390_lowcore.machine_flags \|= MACHINE_FLAG_VX;
b5510d9b HB	224	__ctl_set_bit(0, 17);
b5510d9b HB	225	}
57d7f939 MS	226	if (test_facility(130)) {
	227	S390_lowcore.machine_flags \|= MACHINE_FLAG_NX;
	228	__ctl_set_bit(0, 20);
	229	}
916cda1a MS	230	if (test_facility(133))
916cda1a MS	231	S390_lowcore.machine_flags \|= MACHINE_FLAG_GS;
6e2ef5e4 MS	232	if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
	233	/* Enabled signed clock comparator comparisons */
	234	S390_lowcore.machine_flags \|= MACHINE_FLAG_SCC;
	235	clock_comparator_max = -1ULL >> 1;
	236	__ctl_set_bit(0, 53);
	237	}
b5510d9b HB	238	}
b5510d9b HB	239
1a36a39e MS	240	static inline void save_vector_registers(void)
	241	{
	242	#ifdef CONFIG_CRASH_DUMP
	243	if (test_facility(129))
	244	save_vx_regs(boot_cpu_vector_save_area);
	245	#endif
	246	}
	247
b5510d9b HB	248	static int __init disable_vector_extension(char *str)
	249	{
	250	S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
	251	__ctl_clear_bit(0, 17);
673cfddf	252	return 0;
2e5061e4	253	}
b5510d9b	254	early_param("novx", disable_vector_extension);
2e5061e4	255
57d7f939 MS	256	static int __init noexec_setup(char *str)
	257	{
	258	bool enabled;
	259	int rc;
	260
	261	rc = kstrtobool(str, &enabled);
	262	if (!rc && !enabled) {
	263	/* Disable no-execute support */
	264	S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
	265	__ctl_clear_bit(0, 20);
	266	}
	267	return rc;
	268	}
	269	early_param("noexec", noexec_setup);
	270
61b0b016	271	static int __init cad_setup(char *str)
2c72a44e	272	{
b13de4b7 MS	273	bool enabled;
b13de4b7 MS	274	int rc;
2c72a44e	275
b13de4b7 MS	276	rc = kstrtobool(str, &enabled);
b13de4b7 MS	277	if (!rc && enabled && test_facility(128))
2c72a44e MS	278	/* Enable problem state CAD. */
2c72a44e MS	279	__ctl_set_bit(2, 3);
b13de4b7	280	return rc;
2c72a44e	281	}
b13de4b7	282	early_param("cad", cad_setup);
2c72a44e	283
49698745	284	char __bootdata(early_command_line)[COMMAND_LINE_SIZE];
1fb81057 MH	285	static void __init setup_boot_command_line(void)
1fb81057 MH	286	{
a0443fbb	287	/* copy arch command line */
49698745	288	strlcpy(boot_command_line, early_command_line, ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	289	}
a0443fbb HB	290
627c9b62 VG	291	static void __init check_image_bootable(void)
	292	{
	293	if (!memcmp(EP_STRING, (void *)EP_OFFSET, strlen(EP_STRING)))
	294	return;
	295
	296	sclp_early_printk("Linux kernel boot failure: An attempt to boot a vmlinux ELF image failed.\n");
	297	sclp_early_printk("This image does not contain all parts necessary for starting up. Use\n");
	298	sclp_early_printk("bzImage or arch/s390/boot/compressed/vmlinux instead.\n");
98587c2d	299	disabled_wait();
627c9b62 VG	300	}
627c9b62 VG	301
ab14de6c HC	302	void __init startup_init(void)
ab14de6c HC	303	{
627c9b62	304	check_image_bootable();
b1c0854d	305	time_early_init();
ab14de6c	306	init_kernel_storage_key();
ab14de6c	307	lockdep_off();
ab14de6c	308	setup_lowcore_early();
14375bc4	309	setup_facility_list();
a0443fbb	310	detect_machine_type();
4b8fe77a	311	setup_arch_string();
a0443fbb	312	setup_boot_command_line();
2e5061e4 HC	313	detect_diag9c();
	314	detect_diag44();
	315	detect_machine_facilities();
1a36a39e	316	save_vector_registers();
fade4dc4	317	setup_topology();
7b50da53	318	sclp_early_detect();
ab14de6c HC	319	lockdep_on();
ab14de6c HC	320	}