[thirdparty/kernel/linux.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 "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);

/*
 * Get the TOD clock running.
 */
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(0);

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

#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"
	"	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"
	"	br	14\n"
	"	.size	savesys_ipl_nss, .-savesys_ipl_nss\n"
	"	.previous\n");

static __initdata char upper_command_line[COMMAND_LINE_SIZE];

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;
	int hlen;
	size_t len;
	char *savesys_ptr;
	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;

	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
			"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;
		hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
				 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
	}
#endif

	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
		 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
		 kernel_nss_name, kernel_nss_name);
	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';

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

	if (response != 0) {
		pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
			response);
		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
	 *	     for missing privilege class, it will be 1
	 */
	if (response > SAVESYS_CMD_SIZE || response == 1) {
		pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
			response);
		kernel_nss_name[0] = '\0';
		return;
	}

	/* re-initialize cputime accounting. */
	get_tod_clock_ext(tod_clock_base);
	S390_lowcore.last_update_clock = *(__u64 *) &tod_clock_base[1];
	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	S390_lowcore.user_timer = 0;
	S390_lowcore.system_timer = 0;
	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));

	/* 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)
{
#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;

	/* Running under KVM? If not we assume z/VM */
	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_KVM;
	else
		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 = search_exception_tables(addr);
	if (!fixup)
		disabled_wait(0);
	/* 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)
{
	stfle(S390_lowcore.stfle_fac_list,
	      ARRAY_SIZE(S390_lowcore.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(40))
		S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
	if (test_facility(50) && test_facility(73))
		S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
	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);

static __init void memmove_early(void *dst, const void *src, size_t n)
{
	unsigned long addr;
	long incr;
	psw_t old;

	if (!n)
		return;
	incr = 1;
	if (dst > src) {
		incr = -incr;
		dst += n - 1;
		src += n - 1;
	}
	old = S390_lowcore.program_new_psw;
	S390_lowcore.program_new_psw.mask = __extract_psw();
	asm volatile(
		"	larl	%[addr],1f\n"
		"	stg	%[addr],%[psw_pgm_addr]\n"
		"0:     mvc	0(1,%[dst]),0(%[src])\n"
		"	agr	%[dst],%[incr]\n"
		"	agr	%[src],%[incr]\n"
		"	brctg	%[n],0b\n"
		"1:\n"
		: [addr] "=&d" (addr),
		  [psw_pgm_addr] "=Q" (S390_lowcore.program_new_psw.addr),
		  [dst] "+&a" (dst), [src] "+&a" (src),  [n] "+d" (n)
		: [incr] "d" (incr)
		: "cc", "memory");
	S390_lowcore.program_new_psw = old;
}

static __init noinline void ipl_save_parameters(void)
{
	void *src, *dst;

	src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
	dst = (void *) IPL_PARMBLOCK_ORIGIN;
	memmove_early(dst, src, PAGE_SIZE);
	S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
}

static __init noinline void rescue_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
	/*
	 * Just like in case of IPL from VM reader we make sure there is a
	 * gap of 4MB between end of kernel and start of initrd.
	 * That way we can also be sure that saving an NSS will succeed,
	 * which however only requires different segments.
	 */
	if (!INITRD_START || !INITRD_SIZE)
		return;
	if (INITRD_START >= min_initrd_addr)
		return;
	memmove_early((void *) min_initrd_addr, (void *) INITRD_START, INITRD_SIZE);
	INITRD_START = min_initrd_addr;
#endif
}

/* Set up boot command line */
static void __init append_to_cmdline(size_t (*ipl_data)(char *, size_t))
{
	char *parm, *delim;
	size_t rc, len;

	len = strlen(boot_command_line);

	delim = boot_command_line + len;	/* '\0' character position */
	parm  = boot_command_line + len + 1;	/* append right after '\0' */

	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	if (rc) {
		if (*parm == '=')
			memmove(boot_command_line, parm + 1, rc);
		else
			*delim = ' ';		/* replace '\0' with space */
	}
}

static inline int has_ebcdic_char(const char *str)
{
	int i;

	for (i = 0; str[i]; i++)
		if (str[i] & 0x80)
			return 1;
	return 0;
}

static void __init setup_boot_command_line(void)
{
	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	/* convert arch command line to ascii if necessary */
	if (has_ebcdic_char(COMMAND_LINE))
		EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
	/* copy arch command line */
	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
		ARCH_COMMAND_LINE_SIZE);

	/* append IPL PARM data to the boot command line */
	if (MACHINE_IS_VM)
		append_to_cmdline(append_ipl_vmparm);

	append_to_cmdline(append_ipl_scpdata);
}

/*
 * 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)
{
	reset_tod_clock();
	ipl_save_parameters();
	rescue_initrd();
	clear_bss_section();
	ipl_verify_parameters();
	time_early_init();
	init_kernel_storage_key();
	lockdep_off();
	setup_lowcore_early();
	setup_facility_list();
	detect_machine_type();
	setup_arch_string();
	ipl_update_parameters();
	setup_boot_command_line();
	create_kernel_nss();
	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>
a806170e	32	#include "entry.h"
ab14de6c HC	33
	34	/*
	35	* Create a Kernel NSS if the SAVESYS= parameter is defined
	36	*/
a0443fbb	37	#define DEFSYS_CMD_SIZE 128
ab14de6c HC	38	#define SAVESYS_CMD_SIZE 32
ab14de6c HC	39
ab14de6c HC	40	char kernel_nss_name[NSS_NAME_SIZE + 1];
ab14de6c HC	41
a0443fbb HB	42	static void __init setup_boot_command_line(void);
a0443fbb HB	43
b6112ccb MS	44	/*
	45	* Get the TOD clock running.
	46	*/
	47	static void __init reset_tod_clock(void)
	48	{
	49	u64 time;
	50
1aae0560	51	if (store_tod_clock(&time) == 0)
b6112ccb MS	52	return;
b6112ccb MS	53	/* TOD clock not running. Set the clock to Unix Epoch. */
1aae0560	54	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 \|\| store_tod_clock(&time) != 0)
b6112ccb MS	55	disabled_wait(0);
b6112ccb MS	56
6e2ef5e4 MS	57	memset(tod_clock_base, 0, 16);
	58	(__u64 ) &tod_clock_base[1] = TOD_UNIX_EPOCH;
	59	S390_lowcore.last_update_clock = TOD_UNIX_EPOCH;
b6112ccb	60	}
a0443fbb	61
ab14de6c	62	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	63	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	64
	65	asm(
	66	" .section .init.text,\"ax\",@progbits\n"
	67	" .align 4\n"
	68	" .type savesys_ipl_nss, @function\n"
	69	"savesys_ipl_nss:\n"
a0443fbb HB	70	" stmg 6,15,48(15)\n"
	71	" lgr 14,3\n"
	72	" sam31\n"
	73	" diag 2,14,0x8\n"
	74	" sam64\n"
	75	" lgr 2,14\n"
	76	" lmg 6,15,48(15)\n"
a0443fbb	77	" br 14\n"
18764463 HC	78	" .size savesys_ipl_nss, .-savesys_ipl_nss\n"
18764463 HC	79	" .previous\n");
a0443fbb	80
684d2fd4 HB	81	static __initdata char upper_command_line[COMMAND_LINE_SIZE];
684d2fd4 HB	82
ab14de6c HC	83	static noinline __init void create_kernel_nss(void)
	84	{
	85	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	86	#ifdef CONFIG_BLK_DEV_INITRD
	87	unsigned int sinitrd_pfn, einitrd_pfn;
	88	#endif
	89	int response;
69ac43b0	90	int hlen;
a0443fbb	91	size_t len;
ab14de6c	92	char *savesys_ptr;
ab14de6c HC	93	char defsys_cmd[DEFSYS_CMD_SIZE];
	94	char savesys_cmd[SAVESYS_CMD_SIZE];
	95
	96	/* Do nothing if we are not running under VM */
	97	if (!MACHINE_IS_VM)
	98	return;
	99
	100	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	101	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	102	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	103
	104	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	105
	106	if (!savesys_ptr)
	107	return;
	108
	109	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	110	for (i = 0; i < NSS_NAME_SIZE; i++) {
	111	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	112	break;
	113	kernel_nss_name[i] = savesys_ptr[i];
	114	}
	115
	116	stext_pfn = PFN_DOWN(__pa(&_stext));
	117	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	118	end_pfn = PFN_UP(__pa(&_end));
	119	min_size = end_pfn << 2;
	120
69ac43b0 CL	121	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
	122	"DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	123	kernel_nss_name, stext_pfn - 1, stext_pfn,
	124	eshared_pfn - 1, eshared_pfn, end_pfn);
ab14de6c HC	125
	126	#ifdef CONFIG_BLK_DEV_INITRD
	127	if (INITRD_START && INITRD_SIZE) {
	128	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	129	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	130	min_size = einitrd_pfn << 2;
69ac43b0 CL	131	hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
69ac43b0 CL	132	" EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
ab14de6c HC	133	}
	134	#endif
	135
69ac43b0 CL	136	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
	137	" EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	138	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
894e491e HC	139	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
	140	kernel_nss_name, kernel_nss_name);
	141	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
ab14de6c HC	142
	143	__cpcmd(defsys_cmd, NULL, 0, &response);
	144
583b33bc	145	if (response != 0) {
11af97e1 HB	146	pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
11af97e1 HB	147	response);
583b33bc	148	kernel_nss_name[0] = '\0';
ab14de6c	149	return;
583b33bc	150	}
ab14de6c	151
a0443fbb HB	152	len = strlen(savesys_cmd);
	153	ASCEBC(savesys_cmd, len);
	154	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	155
a0443fbb HB	156	/* On success: response is equal to the command size,
	157	* max SAVESYS_CMD_SIZE
	158	* On error: response contains the numeric portion of cp error message.
	159	* for SAVESYS it will be >= 263
11af97e1	160	* for missing privilege class, it will be 1
a0443fbb	161	*/
11af97e1 HB	162	if (response > SAVESYS_CMD_SIZE \|\| response == 1) {
	163	pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
	164	response);
583b33bc	165	kernel_nss_name[0] = '\0';
ab14de6c	166	return;
583b33bc	167	}
ab14de6c	168
b89031e0	169	/* re-initialize cputime accounting. */
6e2ef5e4 MS	170	get_tod_clock_ext(tod_clock_base);
6e2ef5e4 MS	171	S390_lowcore.last_update_clock = (__u64 ) &tod_clock_base[1];
b89031e0 MS	172	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	173	S390_lowcore.user_timer = 0;
	174	S390_lowcore.system_timer = 0;
	175	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
	176
a0443fbb HB	177	/* re-setup boot command line with new ipl vm parms */
	178	ipl_update_parameters();
	179	setup_boot_command_line();
	180
ab14de6c HC	181	ipl_flags = IPL_NSS_VALID;
	182	}
	183
	184	#else /* CONFIG_SHARED_KERNEL */
	185
	186	static inline void create_kernel_nss(void) { }
	187
	188	#endif /* CONFIG_SHARED_KERNEL */
	189
	190	/*
	191	* Clear bss memory
	192	*/
	193	static noinline __init void clear_bss_section(void)
	194	{
229d9c6d	195	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	196	}
	197
	198	/*
	199	* Initialize storage key for kernel pages
	200	*/
	201	static noinline __init void init_kernel_storage_key(void)
	202	{
127c1fef	203	#if PAGE_DEFAULT_KEY
ab14de6c HC	204	unsigned long end_pfn, init_pfn;
	205
	206	end_pfn = PFN_UP(__pa(&_end));
	207
	208	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	209	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	210	PAGE_DEFAULT_KEY, 0);
127c1fef	211	#endif
ab14de6c HC	212	}
ab14de6c HC	213
fade4dc4	214	static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
92e6ecf3	215
ab14de6c HC	216	static noinline __init void detect_machine_type(void)
ab14de6c HC	217	{
fade4dc4 HC	218	struct sysinfo_3_2_2 vmms = (struct sysinfo_3_2_2 )&sysinfo_page;
fade4dc4 HC	219
27d71602	220	/* Check current-configuration-level */
caf757c6	221	if (stsi(NULL, 0, 0, 0) <= 2) {
27d71602	222	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	223	return;
27d71602 MS	224	}
27d71602 MS	225	/* Get virtual-machine cpu information. */
caf757c6	226	if (stsi(vmms, 3, 2, 2) \|\| !vmms->count)
92e6ecf3	227	return;
ab14de6c	228
92e6ecf3	229	/* Running under KVM? If not we assume z/VM */
fade4dc4	230	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	231	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	232	else
d3135e0c	233	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	234	}
ab14de6c HC	235
d2f03974 HC	236	/* Remove leading, trailing and double whitespace. */
	237	static inline void strim_all(char *str)
	238	{
	239	char *s;
	240
	241	s = strim(str);
	242	if (s != str)
	243	memmove(str, s, strlen(s));
	244	while (*str) {
	245	if (!isspace(*str++))
	246	continue;
	247	if (isspace(*str)) {
	248	s = skip_spaces(str);
	249	memmove(str, s, strlen(s) + 1);
	250	}
	251	}
	252	}
	253
4b8fe77a CB	254	static noinline __init void setup_arch_string(void)
	255	{
	256	struct sysinfo_1_1_1 mach = (struct sysinfo_1_1_1 )&sysinfo_page;
2f8876f9 HC	257	struct sysinfo_3_2_2 vm = (struct sysinfo_3_2_2 )&sysinfo_page;
2f8876f9 HC	258	char mstr[80], hvstr[17];
4b8fe77a CB	259
	260	if (stsi(mach, 1, 1, 1))
	261	return;
	262	EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
	263	EBCASC(mach->type, sizeof(mach->type));
	264	EBCASC(mach->model, sizeof(mach->model));
	265	EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
d2f03974 HC	266	sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
	267	mach->manufacturer, mach->type,
	268	mach->model, mach->model_capacity);
	269	strim_all(mstr);
2f8876f9 HC	270	if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
	271	EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
	272	sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
	273	strim_all(hvstr);
	274	} else {
	275	sprintf(hvstr, "%s",
	276	MACHINE_IS_LPAR ? "LPAR" :
	277	MACHINE_IS_VM ? "z/VM" :
	278	MACHINE_IS_KVM ? "KVM" : "unknown");
	279	}
	280	dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
4b8fe77a CB	281	}
4b8fe77a CB	282
fade4dc4 HC	283	static __init void setup_topology(void)
fade4dc4 HC	284	{
fade4dc4 HC	285	int max_mnest;
	286
	287	if (!test_facility(11))
	288	return;
	289	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
	290	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
caf757c6	291	if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
fade4dc4 HC	292	break;
	293	}
	294	topology_max_mnest = max_mnest;
fade4dc4 HC	295	}
fade4dc4 HC	296
a3415703	297	static void early_pgm_check_handler(void)
ab14de6c	298	{
ab14de6c	299	const struct exception_table_entry *fixup;
50be6345	300	unsigned long cr0, cr0_new;
eb608fb3	301	unsigned long addr;
ab14de6c HC	302
ab14de6c HC	303	addr = S390_lowcore.program_old_psw.addr;
9cb1ccec	304	fixup = search_exception_tables(addr);
ab14de6c HC	305	if (!fixup)
ab14de6c HC	306	disabled_wait(0);
50be6345 PH	307	/* Disable low address protection before storing into lowcore. */
	308	__ctl_store(cr0, 0, 0);
	309	cr0_new = cr0 & ~(1UL << 28);
	310	__ctl_load(cr0_new, 0, 0);
fecc868a	311	S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
50be6345	312	__ctl_load(cr0, 0, 0);
ab14de6c HC	313	}
ab14de6c HC	314
5f954c34	315	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	316	{
	317	psw_t psw;
	318
b50511e4	319	psw.mask = PSW_MASK_BASE \| PSW_DEFAULT_KEY \| PSW_MASK_EA \| PSW_MASK_BA;
fecc868a	320	psw.addr = (unsigned long) s390_base_ext_handler;
ab14de6c	321	S390_lowcore.external_new_psw = psw;
fecc868a	322	psw.addr = (unsigned long) s390_base_pgm_handler;
ab14de6c HC	323	S390_lowcore.program_new_psw = psw;
ab14de6c HC	324	s390_base_pgm_handler_fn = early_pgm_check_handler;
c360192b	325	S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
ab14de6c HC	326	}
ab14de6c HC	327
14375bc4 MS	328	static noinline __init void setup_facility_list(void)
14375bc4 MS	329	{
3ab121ab MH	330	stfle(S390_lowcore.stfle_fac_list,
3ab121ab MH	331	ARRAY_SIZE(S390_lowcore.stfle_fac_list));
14375bc4 MS	332	}
14375bc4 MS	333
2e5061e4 HC	334	static __init void detect_diag9c(void)
	335	{
	336	unsigned int cpu_address;
	337	int rc;
	338
	339	cpu_address = stap();
1ec2772e	340	diag_stat_inc(DIAG_STAT_X09C);
2e5061e4 HC	341	asm volatile(
	342	" diag %2,0,0x9c\n"
	343	"0: la %0,0\n"
	344	"1:\n"
	345	EX_TABLE(0b,1b)
	346	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	347	if (!rc)
d3135e0c	348	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	349	}
	350
	351	static __init void detect_diag44(void)
	352	{
2e5061e4 HC	353	int rc;
2e5061e4 HC	354
1ec2772e	355	diag_stat_inc(DIAG_STAT_X044);
2e5061e4 HC	356	asm volatile(
	357	" diag 0,0,0x44\n"
	358	"0: la %0,0\n"
	359	"1:\n"
	360	EX_TABLE(0b,1b)
	361	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	362	if (!rc)
d3135e0c	363	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	364	}
	365
	366	static __init void detect_machine_facilities(void)
	367	{
3c7ef08b HC	368	if (test_facility(8)) {
	369	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT1;
	370	__ctl_set_bit(0, 23);
	371	}
85e9d0e5 HC	372	if (test_facility(78))
85e9d0e5 HC	373	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT2;
14375bc4	374	if (test_facility(3))
d3135e0c	375	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
14375bc4	376	if (test_facility(40))
23d18e8d	377	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPP;
d35339a4 MS	378	if (test_facility(50) && test_facility(73))
d35339a4 MS	379	S390_lowcore.machine_flags \|= MACHINE_FLAG_TE;
1b948d6c MS	380	if (test_facility(51))
1b948d6c MS	381	S390_lowcore.machine_flags \|= MACHINE_FLAG_TLB_LC;
b5510d9b	382	if (test_facility(129)) {
80703617	383	S390_lowcore.machine_flags \|= MACHINE_FLAG_VX;
b5510d9b HB	384	__ctl_set_bit(0, 17);
b5510d9b HB	385	}
57d7f939 MS	386	if (test_facility(130)) {
	387	S390_lowcore.machine_flags \|= MACHINE_FLAG_NX;
	388	__ctl_set_bit(0, 20);
	389	}
916cda1a MS	390	if (test_facility(133))
916cda1a MS	391	S390_lowcore.machine_flags \|= MACHINE_FLAG_GS;
6e2ef5e4 MS	392	if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
	393	/* Enabled signed clock comparator comparisons */
	394	S390_lowcore.machine_flags \|= MACHINE_FLAG_SCC;
	395	clock_comparator_max = -1ULL >> 1;
	396	__ctl_set_bit(0, 53);
	397	}
b5510d9b HB	398	}
b5510d9b HB	399
1a36a39e MS	400	static inline void save_vector_registers(void)
	401	{
	402	#ifdef CONFIG_CRASH_DUMP
	403	if (test_facility(129))
	404	save_vx_regs(boot_cpu_vector_save_area);
	405	#endif
	406	}
	407
b5510d9b HB	408	static int __init disable_vector_extension(char *str)
	409	{
	410	S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
	411	__ctl_clear_bit(0, 17);
673cfddf	412	return 0;
2e5061e4	413	}
b5510d9b	414	early_param("novx", disable_vector_extension);
2e5061e4	415
57d7f939 MS	416	static int __init noexec_setup(char *str)
	417	{
	418	bool enabled;
	419	int rc;
	420
	421	rc = kstrtobool(str, &enabled);
	422	if (!rc && !enabled) {
	423	/* Disable no-execute support */
	424	S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
	425	__ctl_clear_bit(0, 20);
	426	}
	427	return rc;
	428	}
	429	early_param("noexec", noexec_setup);
	430
61b0b016	431	static int __init cad_setup(char *str)
2c72a44e	432	{
b13de4b7 MS	433	bool enabled;
b13de4b7 MS	434	int rc;
2c72a44e	435
b13de4b7 MS	436	rc = kstrtobool(str, &enabled);
b13de4b7 MS	437	if (!rc && enabled && test_facility(128))
2c72a44e MS	438	/* Enable problem state CAD. */
2c72a44e MS	439	__ctl_set_bit(2, 3);
b13de4b7	440	return rc;
2c72a44e	441	}
b13de4b7	442	early_param("cad", cad_setup);
2c72a44e	443
d543a106 HC	444	static __init void memmove_early(void dst, const void src, size_t n)
	445	{
	446	unsigned long addr;
	447	long incr;
	448	psw_t old;
	449
	450	if (!n)
	451	return;
	452	incr = 1;
	453	if (dst > src) {
	454	incr = -incr;
	455	dst += n - 1;
	456	src += n - 1;
	457	}
	458	old = S390_lowcore.program_new_psw;
	459	S390_lowcore.program_new_psw.mask = __extract_psw();
	460	asm volatile(
	461	" larl %[addr],1f\n"
	462	" stg %[addr],%[psw_pgm_addr]\n"
	463	"0: mvc 0(1,%[dst]),0(%[src])\n"
	464	" agr %[dst],%[incr]\n"
	465	" agr %[src],%[incr]\n"
	466	" brctg %[n],0b\n"
	467	"1:\n"
	468	: [addr] "=&d" (addr),
75a35734	469	[psw_pgm_addr] "=Q" (S390_lowcore.program_new_psw.addr),
d543a106 HC	470	[dst] "+&a" (dst), [src] "+&a" (src), [n] "+d" (n)
	471	: [incr] "d" (incr)
	472	: "cc", "memory");
	473	S390_lowcore.program_new_psw = old;
	474	}
	475
	476	static __init noinline void ipl_save_parameters(void)
	477	{
	478	void src, dst;
	479
	480	src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
	481	dst = (void *) IPL_PARMBLOCK_ORIGIN;
	482	memmove_early(dst, src, PAGE_SIZE);
	483	S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
	484	}
	485
	486	static __init noinline void rescue_initrd(void)
761cdf6a HC	487	{
761cdf6a HC	488	#ifdef CONFIG_BLK_DEV_INITRD
27e7318c	489	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
761cdf6a	490	/*
27e7318c HC	491	* Just like in case of IPL from VM reader we make sure there is a
	492	* gap of 4MB between end of kernel and start of initrd.
	493	* That way we can also be sure that saving an NSS will succeed,
	494	* which however only requires different segments.
761cdf6a HC	495	*/
	496	if (!INITRD_START \|\| !INITRD_SIZE)
	497	return;
27e7318c	498	if (INITRD_START >= min_initrd_addr)
761cdf6a	499	return;
d543a106	500	memmove_early((void ) min_initrd_addr, (void ) INITRD_START, INITRD_SIZE);
27e7318c	501	INITRD_START = min_initrd_addr;
761cdf6a HC	502	#endif
	503	}
	504
a0443fbb	505	/* Set up boot command line */
684d2fd4	506	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	507	{
684d2fd4 HB	508	char parm, delim;
	509	size_t rc, len;
	510
	511	len = strlen(boot_command_line);
a0443fbb	512
684d2fd4 HB	513	delim = boot_command_line + len; /* '\0' character position */
	514	parm = boot_command_line + len + 1; /* append right after '\0' */
	515
	516	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	517	if (rc) {
	518	if (*parm == '=')
	519	memmove(boot_command_line, parm + 1, rc);
	520	else
	521	delim = ' '; / replace '\0' with space */
	522	}
	523	}
	524
1fb81057	525	static inline int has_ebcdic_char(const char *str)
684d2fd4	526	{
61fd330d MS	527	int i;
61fd330d MS	528
1fb81057 MH	529	for (i = 0; str[i]; i++)
	530	if (str[i] & 0x80)
	531	return 1;
	532	return 0;
	533	}
61fd330d	534
1fb81057 MH	535	static void __init setup_boot_command_line(void)
	536	{
	537	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	538	/* convert arch command line to ascii if necessary */
	539	if (has_ebcdic_char(COMMAND_LINE))
	540	EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb	541	/* copy arch command line */
61fd330d MS	542	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
61fd330d MS	543	ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	544
a0443fbb HB	545	/* append IPL PARM data to the boot command line */
684d2fd4 HB	546	if (MACHINE_IS_VM)
	547	append_to_cmdline(append_ipl_vmparm);
	548
	549	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	550	}
a0443fbb HB	551
ab14de6c HC	552	/*
	553	* Save ipl parameters, clear bss memory, initialize storage keys
	554	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	555	*/
	556	void __init startup_init(void)
	557	{
b6112ccb	558	reset_tod_clock();
ab14de6c	559	ipl_save_parameters();
761cdf6a	560	rescue_initrd();
ab14de6c	561	clear_bss_section();
d543a106	562	ipl_verify_parameters();
b1c0854d	563	time_early_init();
ab14de6c	564	init_kernel_storage_key();
ab14de6c	565	lockdep_off();
ab14de6c	566	setup_lowcore_early();
14375bc4	567	setup_facility_list();
a0443fbb	568	detect_machine_type();
4b8fe77a	569	setup_arch_string();
a0443fbb HB	570	ipl_update_parameters();
	571	setup_boot_command_line();
	572	create_kernel_nss();
2e5061e4 HC	573	detect_diag9c();
	574	detect_diag44();
	575	detect_machine_facilities();
1a36a39e	576	save_vector_registers();
fade4dc4	577	setup_topology();
7b50da53	578	sclp_early_detect();
ab14de6c HC	579	lockdep_on();
ab14de6c HC	580	}