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

/*
 *    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);

	sched_clock_base_cc = TOD_UNIX_EPOCH;
	S390_lowcore.last_update_clock = sched_clock_base_cc;
}

#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. */
	sched_clock_base_cc = get_tod_clock();
	S390_lowcore.last_update_clock = sched_clock_base_cc;
	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;
}

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 topology_setup(char *str)
{
	bool enabled;
	int rc;

	rc = kstrtobool(str, &enabled);
	if (!rc && !enabled)
		S390_lowcore.machine_flags &= ~MACHINE_FLAG_TOPOLOGY;
	return rc;
}
early_param("topology", topology_setup);

static int __init disable_vector_extension(char *str)
{
	S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
	__ctl_clear_bit(0, 17);
	return 1;
}
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
ab14de6c	1	/*
155af2f9	2	* Copyright IBM Corp. 2007, 2009
ab14de6c HC	3	* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
	4	* Heiko Carstens <heiko.carstens@de.ibm.com>
	5	*/
	6
11af97e1 HB	7	#define KMSG_COMPONENT "setup"
	8	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	9
92e6ecf3	10	#include <linux/compiler.h>
ab14de6c HC	11	#include <linux/init.h>
	12	#include <linux/errno.h>
	13	#include <linux/string.h>
	14	#include <linux/ctype.h>
	15	#include <linux/lockdep.h>
dcc096c5	16	#include <linux/extable.h>
ab14de6c HC	17	#include <linux/pfn.h>
ab14de6c HC	18	#include <linux/uaccess.h>
11af97e1	19	#include <linux/kernel.h>
1ec2772e	20	#include <asm/diag.h>
a0443fbb	21	#include <asm/ebcdic.h>
46b05d26	22	#include <asm/ipl.h>
ab14de6c HC	23	#include <asm/lowcore.h>
	24	#include <asm/processor.h>
	25	#include <asm/sections.h>
	26	#include <asm/setup.h>
92e6ecf3	27	#include <asm/sysinfo.h>
ab14de6c HC	28	#include <asm/cpcmd.h>
ab14de6c HC	29	#include <asm/sclp.h>
a0616cde	30	#include <asm/facility.h>
a806170e	31	#include "entry.h"
ab14de6c HC	32
	33	/*
	34	* Create a Kernel NSS if the SAVESYS= parameter is defined
	35	*/
a0443fbb	36	#define DEFSYS_CMD_SIZE 128
ab14de6c HC	37	#define SAVESYS_CMD_SIZE 32
ab14de6c HC	38
ab14de6c HC	39	char kernel_nss_name[NSS_NAME_SIZE + 1];
ab14de6c HC	40
a0443fbb HB	41	static void __init setup_boot_command_line(void);
a0443fbb HB	42
b6112ccb MS	43	/*
	44	* Get the TOD clock running.
	45	*/
	46	static void __init reset_tod_clock(void)
	47	{
	48	u64 time;
	49
1aae0560	50	if (store_tod_clock(&time) == 0)
b6112ccb MS	51	return;
b6112ccb MS	52	/* TOD clock not running. Set the clock to Unix Epoch. */
1aae0560	53	if (set_tod_clock(TOD_UNIX_EPOCH) != 0 \|\| store_tod_clock(&time) != 0)
b6112ccb MS	54	disabled_wait(0);
	55
	56	sched_clock_base_cc = TOD_UNIX_EPOCH;
b89031e0	57	S390_lowcore.last_update_clock = sched_clock_base_cc;
b6112ccb	58	}
a0443fbb	59
ab14de6c	60	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	61	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	62
	63	asm(
	64	" .section .init.text,\"ax\",@progbits\n"
	65	" .align 4\n"
	66	" .type savesys_ipl_nss, @function\n"
	67	"savesys_ipl_nss:\n"
a0443fbb HB	68	" stmg 6,15,48(15)\n"
	69	" lgr 14,3\n"
	70	" sam31\n"
	71	" diag 2,14,0x8\n"
	72	" sam64\n"
	73	" lgr 2,14\n"
	74	" lmg 6,15,48(15)\n"
a0443fbb	75	" br 14\n"
18764463 HC	76	" .size savesys_ipl_nss, .-savesys_ipl_nss\n"
18764463 HC	77	" .previous\n");
a0443fbb	78
684d2fd4 HB	79	static __initdata char upper_command_line[COMMAND_LINE_SIZE];
684d2fd4 HB	80
ab14de6c HC	81	static noinline __init void create_kernel_nss(void)
	82	{
	83	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	84	#ifdef CONFIG_BLK_DEV_INITRD
	85	unsigned int sinitrd_pfn, einitrd_pfn;
	86	#endif
	87	int response;
69ac43b0	88	int hlen;
a0443fbb	89	size_t len;
ab14de6c	90	char *savesys_ptr;
ab14de6c HC	91	char defsys_cmd[DEFSYS_CMD_SIZE];
	92	char savesys_cmd[SAVESYS_CMD_SIZE];
	93
	94	/* Do nothing if we are not running under VM */
	95	if (!MACHINE_IS_VM)
	96	return;
	97
	98	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	99	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	100	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	101
	102	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	103
	104	if (!savesys_ptr)
	105	return;
	106
	107	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	108	for (i = 0; i < NSS_NAME_SIZE; i++) {
	109	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	110	break;
	111	kernel_nss_name[i] = savesys_ptr[i];
	112	}
	113
	114	stext_pfn = PFN_DOWN(__pa(&_stext));
	115	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	116	end_pfn = PFN_UP(__pa(&_end));
	117	min_size = end_pfn << 2;
	118
69ac43b0 CL	119	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
	120	"DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	121	kernel_nss_name, stext_pfn - 1, stext_pfn,
	122	eshared_pfn - 1, eshared_pfn, end_pfn);
ab14de6c HC	123
	124	#ifdef CONFIG_BLK_DEV_INITRD
	125	if (INITRD_START && INITRD_SIZE) {
	126	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	127	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	128	min_size = einitrd_pfn << 2;
69ac43b0 CL	129	hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
69ac43b0 CL	130	" EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
ab14de6c HC	131	}
	132	#endif
	133
69ac43b0 CL	134	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
	135	" EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	136	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
894e491e HC	137	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
	138	kernel_nss_name, kernel_nss_name);
	139	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
ab14de6c HC	140
	141	__cpcmd(defsys_cmd, NULL, 0, &response);
	142
583b33bc	143	if (response != 0) {
11af97e1 HB	144	pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
11af97e1 HB	145	response);
583b33bc	146	kernel_nss_name[0] = '\0';
ab14de6c	147	return;
583b33bc	148	}
ab14de6c	149
a0443fbb HB	150	len = strlen(savesys_cmd);
	151	ASCEBC(savesys_cmd, len);
	152	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	153
a0443fbb HB	154	/* On success: response is equal to the command size,
	155	* max SAVESYS_CMD_SIZE
	156	* On error: response contains the numeric portion of cp error message.
	157	* for SAVESYS it will be >= 263
11af97e1	158	* for missing privilege class, it will be 1
a0443fbb	159	*/
11af97e1 HB	160	if (response > SAVESYS_CMD_SIZE \|\| response == 1) {
	161	pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
	162	response);
583b33bc	163	kernel_nss_name[0] = '\0';
ab14de6c	164	return;
583b33bc	165	}
ab14de6c	166
b89031e0	167	/* re-initialize cputime accounting. */
1aae0560	168	sched_clock_base_cc = get_tod_clock();
b89031e0 MS	169	S390_lowcore.last_update_clock = sched_clock_base_cc;
	170	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	171	S390_lowcore.user_timer = 0;
	172	S390_lowcore.system_timer = 0;
	173	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
	174
a0443fbb HB	175	/* re-setup boot command line with new ipl vm parms */
	176	ipl_update_parameters();
	177	setup_boot_command_line();
	178
ab14de6c HC	179	ipl_flags = IPL_NSS_VALID;
	180	}
	181
	182	#else /* CONFIG_SHARED_KERNEL */
	183
	184	static inline void create_kernel_nss(void) { }
	185
	186	#endif /* CONFIG_SHARED_KERNEL */
	187
	188	/*
	189	* Clear bss memory
	190	*/
	191	static noinline __init void clear_bss_section(void)
	192	{
229d9c6d	193	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	194	}
	195
	196	/*
	197	* Initialize storage key for kernel pages
	198	*/
	199	static noinline __init void init_kernel_storage_key(void)
	200	{
127c1fef	201	#if PAGE_DEFAULT_KEY
ab14de6c HC	202	unsigned long end_pfn, init_pfn;
	203
	204	end_pfn = PFN_UP(__pa(&_end));
	205
	206	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	207	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	208	PAGE_DEFAULT_KEY, 0);
127c1fef	209	#endif
ab14de6c HC	210	}
ab14de6c HC	211
fade4dc4	212	static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
92e6ecf3	213
ab14de6c HC	214	static noinline __init void detect_machine_type(void)
ab14de6c HC	215	{
fade4dc4 HC	216	struct sysinfo_3_2_2 vmms = (struct sysinfo_3_2_2 )&sysinfo_page;
fade4dc4 HC	217
27d71602	218	/* Check current-configuration-level */
caf757c6	219	if (stsi(NULL, 0, 0, 0) <= 2) {
27d71602	220	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	221	return;
27d71602 MS	222	}
27d71602 MS	223	/* Get virtual-machine cpu information. */
caf757c6	224	if (stsi(vmms, 3, 2, 2) \|\| !vmms->count)
92e6ecf3	225	return;
ab14de6c	226
92e6ecf3	227	/* Running under KVM? If not we assume z/VM */
fade4dc4	228	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	229	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	230	else
d3135e0c	231	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	232	}
ab14de6c HC	233
d2f03974 HC	234	/* Remove leading, trailing and double whitespace. */
	235	static inline void strim_all(char *str)
	236	{
	237	char *s;
	238
	239	s = strim(str);
	240	if (s != str)
	241	memmove(str, s, strlen(s));
	242	while (*str) {
	243	if (!isspace(*str++))
	244	continue;
	245	if (isspace(*str)) {
	246	s = skip_spaces(str);
	247	memmove(str, s, strlen(s) + 1);
	248	}
	249	}
	250	}
	251
4b8fe77a CB	252	static noinline __init void setup_arch_string(void)
	253	{
	254	struct sysinfo_1_1_1 mach = (struct sysinfo_1_1_1 )&sysinfo_page;
2f8876f9 HC	255	struct sysinfo_3_2_2 vm = (struct sysinfo_3_2_2 )&sysinfo_page;
2f8876f9 HC	256	char mstr[80], hvstr[17];
4b8fe77a CB	257
	258	if (stsi(mach, 1, 1, 1))
	259	return;
	260	EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
	261	EBCASC(mach->type, sizeof(mach->type));
	262	EBCASC(mach->model, sizeof(mach->model));
	263	EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
d2f03974 HC	264	sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
	265	mach->manufacturer, mach->type,
	266	mach->model, mach->model_capacity);
	267	strim_all(mstr);
2f8876f9 HC	268	if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
	269	EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
	270	sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
	271	strim_all(hvstr);
	272	} else {
	273	sprintf(hvstr, "%s",
	274	MACHINE_IS_LPAR ? "LPAR" :
	275	MACHINE_IS_VM ? "z/VM" :
	276	MACHINE_IS_KVM ? "KVM" : "unknown");
	277	}
	278	dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
4b8fe77a CB	279	}
4b8fe77a CB	280
fade4dc4 HC	281	static __init void setup_topology(void)
fade4dc4 HC	282	{
fade4dc4 HC	283	int max_mnest;
	284
	285	if (!test_facility(11))
	286	return;
	287	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
	288	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
caf757c6	289	if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
fade4dc4 HC	290	break;
	291	}
	292	topology_max_mnest = max_mnest;
fade4dc4 HC	293	}
fade4dc4 HC	294
a3415703	295	static void early_pgm_check_handler(void)
ab14de6c	296	{
ab14de6c	297	const struct exception_table_entry *fixup;
50be6345	298	unsigned long cr0, cr0_new;
eb608fb3	299	unsigned long addr;
ab14de6c HC	300
ab14de6c HC	301	addr = S390_lowcore.program_old_psw.addr;
9cb1ccec	302	fixup = search_exception_tables(addr);
ab14de6c HC	303	if (!fixup)
ab14de6c HC	304	disabled_wait(0);
50be6345 PH	305	/* Disable low address protection before storing into lowcore. */
	306	__ctl_store(cr0, 0, 0);
	307	cr0_new = cr0 & ~(1UL << 28);
	308	__ctl_load(cr0_new, 0, 0);
fecc868a	309	S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
50be6345	310	__ctl_load(cr0, 0, 0);
ab14de6c HC	311	}
ab14de6c HC	312
5f954c34	313	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	314	{
	315	psw_t psw;
	316
b50511e4	317	psw.mask = PSW_MASK_BASE \| PSW_DEFAULT_KEY \| PSW_MASK_EA \| PSW_MASK_BA;
fecc868a	318	psw.addr = (unsigned long) s390_base_ext_handler;
ab14de6c	319	S390_lowcore.external_new_psw = psw;
fecc868a	320	psw.addr = (unsigned long) s390_base_pgm_handler;
ab14de6c HC	321	S390_lowcore.program_new_psw = psw;
ab14de6c HC	322	s390_base_pgm_handler_fn = early_pgm_check_handler;
c360192b	323	S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
ab14de6c HC	324	}
ab14de6c HC	325
14375bc4 MS	326	static noinline __init void setup_facility_list(void)
14375bc4 MS	327	{
3ab121ab MH	328	stfle(S390_lowcore.stfle_fac_list,
3ab121ab MH	329	ARRAY_SIZE(S390_lowcore.stfle_fac_list));
14375bc4 MS	330	}
14375bc4 MS	331
2e5061e4 HC	332	static __init void detect_diag9c(void)
	333	{
	334	unsigned int cpu_address;
	335	int rc;
	336
	337	cpu_address = stap();
1ec2772e	338	diag_stat_inc(DIAG_STAT_X09C);
2e5061e4 HC	339	asm volatile(
	340	" diag %2,0,0x9c\n"
	341	"0: la %0,0\n"
	342	"1:\n"
	343	EX_TABLE(0b,1b)
	344	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	345	if (!rc)
d3135e0c	346	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	347	}
	348
	349	static __init void detect_diag44(void)
	350	{
2e5061e4 HC	351	int rc;
2e5061e4 HC	352
1ec2772e	353	diag_stat_inc(DIAG_STAT_X044);
2e5061e4 HC	354	asm volatile(
	355	" diag 0,0,0x44\n"
	356	"0: la %0,0\n"
	357	"1:\n"
	358	EX_TABLE(0b,1b)
	359	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	360	if (!rc)
d3135e0c	361	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	362	}
	363
	364	static __init void detect_machine_facilities(void)
	365	{
3c7ef08b HC	366	if (test_facility(8)) {
	367	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT1;
	368	__ctl_set_bit(0, 23);
	369	}
85e9d0e5 HC	370	if (test_facility(78))
85e9d0e5 HC	371	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT2;
14375bc4	372	if (test_facility(3))
d3135e0c	373	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
14375bc4	374	if (test_facility(40))
23d18e8d	375	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPP;
d35339a4 MS	376	if (test_facility(50) && test_facility(73))
d35339a4 MS	377	S390_lowcore.machine_flags \|= MACHINE_FLAG_TE;
1b948d6c MS	378	if (test_facility(51))
1b948d6c MS	379	S390_lowcore.machine_flags \|= MACHINE_FLAG_TLB_LC;
b5510d9b	380	if (test_facility(129)) {
80703617	381	S390_lowcore.machine_flags \|= MACHINE_FLAG_VX;
b5510d9b HB	382	__ctl_set_bit(0, 17);
b5510d9b HB	383	}
57d7f939 MS	384	if (test_facility(130)) {
	385	S390_lowcore.machine_flags \|= MACHINE_FLAG_NX;
	386	__ctl_set_bit(0, 20);
	387	}
916cda1a MS	388	if (test_facility(133))
916cda1a MS	389	S390_lowcore.machine_flags \|= MACHINE_FLAG_GS;
b5510d9b HB	390	}
b5510d9b HB	391
1a36a39e MS	392	static inline void save_vector_registers(void)
	393	{
	394	#ifdef CONFIG_CRASH_DUMP
	395	if (test_facility(129))
	396	save_vx_regs(boot_cpu_vector_save_area);
	397	#endif
	398	}
	399
68cc795d HC	400	static int __init topology_setup(char *str)
	401	{
	402	bool enabled;
	403	int rc;
	404
	405	rc = kstrtobool(str, &enabled);
	406	if (!rc && !enabled)
4fd4dd8b	407	S390_lowcore.machine_flags &= ~MACHINE_FLAG_TOPOLOGY;
68cc795d HC	408	return rc;
	409	}
	410	early_param("topology", topology_setup);
	411
b5510d9b HB	412	static int __init disable_vector_extension(char *str)
	413	{
	414	S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
	415	__ctl_clear_bit(0, 17);
	416	return 1;
2e5061e4	417	}
b5510d9b	418	early_param("novx", disable_vector_extension);
2e5061e4	419
57d7f939 MS	420	static int __init noexec_setup(char *str)
	421	{
	422	bool enabled;
	423	int rc;
	424
	425	rc = kstrtobool(str, &enabled);
	426	if (!rc && !enabled) {
	427	/* Disable no-execute support */
	428	S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
	429	__ctl_clear_bit(0, 20);
	430	}
	431	return rc;
	432	}
	433	early_param("noexec", noexec_setup);
	434
61b0b016	435	static int __init cad_setup(char *str)
2c72a44e	436	{
b13de4b7 MS	437	bool enabled;
b13de4b7 MS	438	int rc;
2c72a44e	439
b13de4b7 MS	440	rc = kstrtobool(str, &enabled);
b13de4b7 MS	441	if (!rc && enabled && test_facility(128))
2c72a44e MS	442	/* Enable problem state CAD. */
2c72a44e MS	443	__ctl_set_bit(2, 3);
b13de4b7	444	return rc;
2c72a44e	445	}
b13de4b7	446	early_param("cad", cad_setup);
2c72a44e	447
d543a106 HC	448	static __init void memmove_early(void dst, const void src, size_t n)
	449	{
	450	unsigned long addr;
	451	long incr;
	452	psw_t old;
	453
	454	if (!n)
	455	return;
	456	incr = 1;
	457	if (dst > src) {
	458	incr = -incr;
	459	dst += n - 1;
	460	src += n - 1;
	461	}
	462	old = S390_lowcore.program_new_psw;
	463	S390_lowcore.program_new_psw.mask = __extract_psw();
	464	asm volatile(
	465	" larl %[addr],1f\n"
	466	" stg %[addr],%[psw_pgm_addr]\n"
	467	"0: mvc 0(1,%[dst]),0(%[src])\n"
	468	" agr %[dst],%[incr]\n"
	469	" agr %[src],%[incr]\n"
	470	" brctg %[n],0b\n"
	471	"1:\n"
	472	: [addr] "=&d" (addr),
75a35734	473	[psw_pgm_addr] "=Q" (S390_lowcore.program_new_psw.addr),
d543a106 HC	474	[dst] "+&a" (dst), [src] "+&a" (src), [n] "+d" (n)
	475	: [incr] "d" (incr)
	476	: "cc", "memory");
	477	S390_lowcore.program_new_psw = old;
	478	}
	479
	480	static __init noinline void ipl_save_parameters(void)
	481	{
	482	void src, dst;
	483
	484	src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
	485	dst = (void *) IPL_PARMBLOCK_ORIGIN;
	486	memmove_early(dst, src, PAGE_SIZE);
	487	S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
	488	}
	489
	490	static __init noinline void rescue_initrd(void)
761cdf6a HC	491	{
761cdf6a HC	492	#ifdef CONFIG_BLK_DEV_INITRD
27e7318c	493	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
761cdf6a	494	/*
27e7318c HC	495	* Just like in case of IPL from VM reader we make sure there is a
	496	* gap of 4MB between end of kernel and start of initrd.
	497	* That way we can also be sure that saving an NSS will succeed,
	498	* which however only requires different segments.
761cdf6a HC	499	*/
	500	if (!INITRD_START \|\| !INITRD_SIZE)
	501	return;
27e7318c	502	if (INITRD_START >= min_initrd_addr)
761cdf6a	503	return;
d543a106	504	memmove_early((void ) min_initrd_addr, (void ) INITRD_START, INITRD_SIZE);
27e7318c	505	INITRD_START = min_initrd_addr;
761cdf6a HC	506	#endif
	507	}
	508
a0443fbb	509	/* Set up boot command line */
684d2fd4	510	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	511	{
684d2fd4 HB	512	char parm, delim;
	513	size_t rc, len;
	514
	515	len = strlen(boot_command_line);
a0443fbb	516
684d2fd4 HB	517	delim = boot_command_line + len; /* '\0' character position */
	518	parm = boot_command_line + len + 1; /* append right after '\0' */
	519
	520	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	521	if (rc) {
	522	if (*parm == '=')
	523	memmove(boot_command_line, parm + 1, rc);
	524	else
	525	delim = ' '; / replace '\0' with space */
	526	}
	527	}
	528
1fb81057	529	static inline int has_ebcdic_char(const char *str)
684d2fd4	530	{
61fd330d MS	531	int i;
61fd330d MS	532
1fb81057 MH	533	for (i = 0; str[i]; i++)
	534	if (str[i] & 0x80)
	535	return 1;
	536	return 0;
	537	}
61fd330d	538
1fb81057 MH	539	static void __init setup_boot_command_line(void)
	540	{
	541	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	542	/* convert arch command line to ascii if necessary */
	543	if (has_ebcdic_char(COMMAND_LINE))
	544	EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb	545	/* copy arch command line */
61fd330d MS	546	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
61fd330d MS	547	ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	548
a0443fbb HB	549	/* append IPL PARM data to the boot command line */
684d2fd4 HB	550	if (MACHINE_IS_VM)
	551	append_to_cmdline(append_ipl_vmparm);
	552
	553	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	554	}
a0443fbb HB	555
ab14de6c HC	556	/*
	557	* Save ipl parameters, clear bss memory, initialize storage keys
	558	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	559	*/
	560	void __init startup_init(void)
	561	{
b6112ccb	562	reset_tod_clock();
ab14de6c	563	ipl_save_parameters();
761cdf6a	564	rescue_initrd();
ab14de6c	565	clear_bss_section();
d543a106	566	ipl_verify_parameters();
b1c0854d	567	time_early_init();
ab14de6c	568	init_kernel_storage_key();
ab14de6c	569	lockdep_off();
ab14de6c	570	setup_lowcore_early();
14375bc4	571	setup_facility_list();
a0443fbb	572	detect_machine_type();
4b8fe77a	573	setup_arch_string();
a0443fbb HB	574	ipl_update_parameters();
	575	setup_boot_command_line();
	576	create_kernel_nss();
2e5061e4 HC	577	detect_diag9c();
	578	detect_diag44();
	579	detect_machine_facilities();
1a36a39e	580	save_vector_registers();
fade4dc4	581	setup_topology();
7b50da53	582	sclp_early_detect();
ab14de6c HC	583	lockdep_on();
ab14de6c HC	584	}