[deliverable/linux.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/ftrace.h>
#include <linux/lockdep.h>
#include <linux/module.h>
#include <linux/pfn.h>
#include <linux/uaccess.h>
#include <linux/kernel.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_clock(&time) == 0)
		return;
	/* TOD clock not running. Set the clock to Unix Epoch. */
	if (set_clock(TOD_UNIX_EPOCH) != 0 || store_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"
#ifdef CONFIG_64BIT
	"	stmg	6,15,48(15)\n"
	"	lgr	14,3\n"
	"	sam31\n"
	"	diag	2,14,0x8\n"
	"	sam64\n"
	"	lgr	2,14\n"
	"	lmg	6,15,48(15)\n"
#else
	"	stm	6,15,24(15)\n"
	"	lr	14,3\n"
	"	diag	2,14,0x8\n"
	"	lr	2,14\n"
	"	lm	6,15,24(15)\n"
#endif
	"	br	14\n"
	"	.size	savesys_ipl_nss, .-savesys_ipl_nss\n"
	"	.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_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)
{
	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);
}

static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);

static noinline __init void detect_machine_type(void)
{
	/* Check current-configuration-level */
	if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
		return;
	}
	/* Get virtual-machine cpu information. */
	if (stsi(&vmms, 3, 2, 2) == -ENOSYS || !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;
}

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

	addr = S390_lowcore.program_old_psw.addr;
	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	if (!fixup)
		disabled_wait(0);
	S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
}

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

	psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
	psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_ext_handler;
	S390_lowcore.external_new_psw = psw;
	psw.addr = PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
	S390_lowcore.program_new_psw = psw;
	s390_base_pgm_handler_fn = early_pgm_check_handler;
}

static noinline __init void setup_facility_list(void)
{
	stfle(S390_lowcore.stfle_fac_list,
	      ARRAY_SIZE(S390_lowcore.stfle_fac_list));
}

static noinline __init void setup_hpage(void)
{
#ifndef CONFIG_DEBUG_PAGEALLOC
	if (!test_facility(2) || !test_facility(8))
		return;
	S390_lowcore.machine_flags |= MACHINE_FLAG_HPAGE;
	__ctl_set_bit(0, 23);
#endif
}

static __init void detect_mvpg(void)
{
#ifndef CONFIG_64BIT
	int rc;

	asm volatile(
		"	la	0,0\n"
		"	mvpg	%2,%2\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	if (!rc)
		S390_lowcore.machine_flags |= MACHINE_FLAG_MVPG;
#endif
}

static __init void detect_ieee(void)
{
#ifndef CONFIG_64BIT
	int rc, tmp;

	asm volatile(
		"	efpc	%1,0\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	if (!rc)
		S390_lowcore.machine_flags |= MACHINE_FLAG_IEEE;
#endif
}

static __init void detect_csp(void)
{
#ifndef CONFIG_64BIT
	int rc;

	asm volatile(
		"	la	0,0\n"
		"	la	1,0\n"
		"	la	2,4\n"
		"	csp	0,2\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	if (!rc)
		S390_lowcore.machine_flags |= MACHINE_FLAG_CSP;
#endif
}

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

	cpu_address = stap();
	asm volatile(
		"	diag	%2,0,0x9c\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	if (!rc)
		S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG9C;
}

static __init void detect_diag44(void)
{
#ifdef CONFIG_64BIT
	int rc;

	asm volatile(
		"	diag	0,0,0x44\n"
		"0:	la	%0,0\n"
		"1:\n"
		EX_TABLE(0b,1b)
		: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	if (!rc)
		S390_lowcore.machine_flags |= MACHINE_FLAG_DIAG44;
#endif
}

static __init void detect_machine_facilities(void)
{
#ifdef CONFIG_64BIT
	if (test_facility(3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
	if (test_facility(8))
		S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
	if (test_facility(11))
		S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
	if (test_facility(27))
		S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
	if (test_facility(40))
		S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
#endif
}

static __init 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((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();
	init_kernel_storage_key();
	lockdep_init();
	lockdep_off();
	sort_main_extable();
	setup_lowcore_early();
	setup_facility_list();
	detect_machine_type();
	ipl_update_parameters();
	setup_boot_command_line();
	create_kernel_nss();
	detect_mvpg();
	detect_ieee();
	detect_csp();
	detect_diag9c();
	detect_diag44();
	detect_machine_facilities();
	setup_hpage();
	sclp_facilities_detect();
	detect_memory_layout(memory_chunk);
#ifdef CONFIG_DYNAMIC_FTRACE
	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
#endif
	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>
dfd9f7ab	15	#include <linux/ftrace.h>
ab14de6c HC	16	#include <linux/lockdep.h>
	17	#include <linux/module.h>
	18	#include <linux/pfn.h>
	19	#include <linux/uaccess.h>
11af97e1	20	#include <linux/kernel.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
	50	if (store_clock(&time) == 0)
	51	return;
	52	/* TOD clock not running. Set the clock to Unix Epoch. */
	53	if (set_clock(TOD_UNIX_EPOCH) != 0 \|\| store_clock(&time) != 0)
	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"
	68	#ifdef CONFIG_64BIT
	69	" stmg 6,15,48(15)\n"
	70	" lgr 14,3\n"
	71	" sam31\n"
	72	" diag 2,14,0x8\n"
	73	" sam64\n"
	74	" lgr 2,14\n"
	75	" lmg 6,15,48(15)\n"
	76	#else
	77	" stm 6,15,24(15)\n"
	78	" lr 14,3\n"
	79	" diag 2,14,0x8\n"
	80	" lr 2,14\n"
	81	" lm 6,15,24(15)\n"
	82	#endif
	83	" br 14\n"
18764463 HC	84	" .size savesys_ipl_nss, .-savesys_ipl_nss\n"
18764463 HC	85	" .previous\n");
a0443fbb	86
684d2fd4 HB	87	static __initdata char upper_command_line[COMMAND_LINE_SIZE];
684d2fd4 HB	88
ab14de6c HC	89	static noinline __init void create_kernel_nss(void)
	90	{
	91	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	92	#ifdef CONFIG_BLK_DEV_INITRD
	93	unsigned int sinitrd_pfn, einitrd_pfn;
	94	#endif
	95	int response;
69ac43b0	96	int hlen;
a0443fbb	97	size_t len;
ab14de6c	98	char *savesys_ptr;
ab14de6c HC	99	char defsys_cmd[DEFSYS_CMD_SIZE];
	100	char savesys_cmd[SAVESYS_CMD_SIZE];
	101
	102	/* Do nothing if we are not running under VM */
	103	if (!MACHINE_IS_VM)
	104	return;
	105
	106	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	107	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	108	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	109
	110	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	111
	112	if (!savesys_ptr)
	113	return;
	114
	115	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	116	for (i = 0; i < NSS_NAME_SIZE; i++) {
	117	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	118	break;
	119	kernel_nss_name[i] = savesys_ptr[i];
	120	}
	121
	122	stext_pfn = PFN_DOWN(__pa(&_stext));
	123	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	124	end_pfn = PFN_UP(__pa(&_end));
	125	min_size = end_pfn << 2;
	126
69ac43b0 CL	127	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
	128	"DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	129	kernel_nss_name, stext_pfn - 1, stext_pfn,
	130	eshared_pfn - 1, eshared_pfn, end_pfn);
ab14de6c HC	131
	132	#ifdef CONFIG_BLK_DEV_INITRD
	133	if (INITRD_START && INITRD_SIZE) {
	134	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	135	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	136	min_size = einitrd_pfn << 2;
69ac43b0 CL	137	hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
69ac43b0 CL	138	" EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
ab14de6c HC	139	}
	140	#endif
	141
69ac43b0 CL	142	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
	143	" EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	144	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
894e491e HC	145	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
	146	kernel_nss_name, kernel_nss_name);
	147	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
ab14de6c HC	148
	149	__cpcmd(defsys_cmd, NULL, 0, &response);
	150
583b33bc	151	if (response != 0) {
11af97e1 HB	152	pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
11af97e1 HB	153	response);
583b33bc	154	kernel_nss_name[0] = '\0';
ab14de6c	155	return;
583b33bc	156	}
ab14de6c	157
a0443fbb HB	158	len = strlen(savesys_cmd);
	159	ASCEBC(savesys_cmd, len);
	160	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	161
a0443fbb HB	162	/* On success: response is equal to the command size,
	163	* max SAVESYS_CMD_SIZE
	164	* On error: response contains the numeric portion of cp error message.
	165	* for SAVESYS it will be >= 263
11af97e1	166	* for missing privilege class, it will be 1
a0443fbb	167	*/
11af97e1 HB	168	if (response > SAVESYS_CMD_SIZE \|\| response == 1) {
	169	pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
	170	response);
583b33bc	171	kernel_nss_name[0] = '\0';
ab14de6c	172	return;
583b33bc	173	}
ab14de6c	174
b89031e0 MS	175	/* re-initialize cputime accounting. */
	176	sched_clock_base_cc = get_clock();
	177	S390_lowcore.last_update_clock = sched_clock_base_cc;
	178	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	179	S390_lowcore.user_timer = 0;
	180	S390_lowcore.system_timer = 0;
	181	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
	182
a0443fbb HB	183	/* re-setup boot command line with new ipl vm parms */
	184	ipl_update_parameters();
	185	setup_boot_command_line();
	186
ab14de6c HC	187	ipl_flags = IPL_NSS_VALID;
	188	}
	189
	190	#else /* CONFIG_SHARED_KERNEL */
	191
	192	static inline void create_kernel_nss(void) { }
	193
	194	#endif /* CONFIG_SHARED_KERNEL */
	195
	196	/*
	197	* Clear bss memory
	198	*/
	199	static noinline __init void clear_bss_section(void)
	200	{
229d9c6d	201	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	202	}
	203
	204	/*
	205	* Initialize storage key for kernel pages
	206	*/
	207	static noinline __init void init_kernel_storage_key(void)
	208	{
	209	unsigned long end_pfn, init_pfn;
	210
	211	end_pfn = PFN_UP(__pa(&_end));
	212
	213	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	214	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	215	PAGE_DEFAULT_KEY, 0);
ab14de6c HC	216	}
ab14de6c HC	217
92e6ecf3 CB	218	static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
92e6ecf3 CB	219
ab14de6c HC	220	static noinline __init void detect_machine_type(void)
ab14de6c HC	221	{
27d71602 MS	222	/* Check current-configuration-level */
	223	if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
	224	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	225	return;
27d71602 MS	226	}
	227	/* Get virtual-machine cpu information. */
	228	if (stsi(&vmms, 3, 2, 2) == -ENOSYS \|\| !vmms.count)
92e6ecf3	229	return;
ab14de6c	230
92e6ecf3 CB	231	/* Running under KVM? If not we assume z/VM */
92e6ecf3 CB	232	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	233	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	234	else
d3135e0c	235	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	236	}
ab14de6c HC	237
a3415703	238	static void early_pgm_check_handler(void)
ab14de6c HC	239	{
	240	unsigned long addr;
	241	const struct exception_table_entry *fixup;
	242
	243	addr = S390_lowcore.program_old_psw.addr;
	244	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	245	if (!fixup)
	246	disabled_wait(0);
	247	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	248	}
	249
5f954c34	250	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	251	{
	252	psw_t psw;
	253
b50511e4	254	psw.mask = PSW_MASK_BASE \| PSW_DEFAULT_KEY \| PSW_MASK_EA \| PSW_MASK_BA;
ab14de6c HC	255	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	256	S390_lowcore.external_new_psw = psw;
	257	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	258	S390_lowcore.program_new_psw = psw;
	259	s390_base_pgm_handler_fn = early_pgm_check_handler;
	260	}
	261
14375bc4 MS	262	static noinline __init void setup_facility_list(void)
14375bc4 MS	263	{
3ab121ab MH	264	stfle(S390_lowcore.stfle_fac_list,
3ab121ab MH	265	ARRAY_SIZE(S390_lowcore.stfle_fac_list));
14375bc4 MS	266	}
14375bc4 MS	267
53492b1d GS	268	static noinline __init void setup_hpage(void)
	269	{
	270	#ifndef CONFIG_DEBUG_PAGEALLOC
14375bc4	271	if (!test_facility(2) \|\| !test_facility(8))
53492b1d	272	return;
d3135e0c	273	S390_lowcore.machine_flags \|= MACHINE_FLAG_HPAGE;
53492b1d GS	274	__ctl_set_bit(0, 23);
	275	#endif
	276	}
	277
2e5061e4 HC	278	static __init void detect_mvpg(void)
	279	{
	280	#ifndef CONFIG_64BIT
	281	int rc;
	282
	283	asm volatile(
	284	" la 0,0\n"
	285	" mvpg %2,%2\n"
	286	"0: la %0,0\n"
	287	"1:\n"
	288	EX_TABLE(0b,1b)
	289	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	290	if (!rc)
d3135e0c	291	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVPG;
2e5061e4 HC	292	#endif
	293	}
	294
	295	static __init void detect_ieee(void)
	296	{
	297	#ifndef CONFIG_64BIT
	298	int rc, tmp;
	299
	300	asm volatile(
	301	" efpc %1,0\n"
	302	"0: la %0,0\n"
	303	"1:\n"
	304	EX_TABLE(0b,1b)
	305	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	306	if (!rc)
d3135e0c	307	S390_lowcore.machine_flags \|= MACHINE_FLAG_IEEE;
2e5061e4 HC	308	#endif
	309	}
	310
	311	static __init void detect_csp(void)
	312	{
	313	#ifndef CONFIG_64BIT
	314	int rc;
	315
	316	asm volatile(
	317	" la 0,0\n"
	318	" la 1,0\n"
	319	" la 2,4\n"
	320	" csp 0,2\n"
	321	"0: la %0,0\n"
	322	"1:\n"
	323	EX_TABLE(0b,1b)
	324	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	325	if (!rc)
d3135e0c	326	S390_lowcore.machine_flags \|= MACHINE_FLAG_CSP;
2e5061e4 HC	327	#endif
	328	}
	329
	330	static __init void detect_diag9c(void)
	331	{
	332	unsigned int cpu_address;
	333	int rc;
	334
	335	cpu_address = stap();
	336	asm volatile(
	337	" diag %2,0,0x9c\n"
	338	"0: la %0,0\n"
	339	"1:\n"
	340	EX_TABLE(0b,1b)
	341	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	342	if (!rc)
d3135e0c	343	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	344	}
	345
	346	static __init void detect_diag44(void)
	347	{
	348	#ifdef CONFIG_64BIT
	349	int rc;
	350
	351	asm volatile(
	352	" diag 0,0,0x44\n"
	353	"0: la %0,0\n"
	354	"1:\n"
	355	EX_TABLE(0b,1b)
	356	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	357	if (!rc)
d3135e0c	358	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	359	#endif
	360	}
	361
	362	static __init void detect_machine_facilities(void)
	363	{
	364	#ifdef CONFIG_64BIT
14375bc4	365	if (test_facility(3))
d3135e0c	366	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
14375bc4	367	if (test_facility(8))
d3135e0c	368	S390_lowcore.machine_flags \|= MACHINE_FLAG_PFMF;
9186d7a9 HC	369	if (test_facility(11))
9186d7a9 HC	370	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
14375bc4	371	if (test_facility(27))
d3135e0c	372	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVCOS;
14375bc4	373	if (test_facility(40))
cd3b70f5	374	S390_lowcore.machine_flags \|= MACHINE_FLAG_SPP;
2e5061e4 HC	375	#endif
	376	}
	377
761cdf6a HC	378	static __init void rescue_initrd(void)
	379	{
	380	#ifdef CONFIG_BLK_DEV_INITRD
27e7318c	381	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
761cdf6a	382	/*
27e7318c HC	383	* Just like in case of IPL from VM reader we make sure there is a
	384	* gap of 4MB between end of kernel and start of initrd.
	385	* That way we can also be sure that saving an NSS will succeed,
	386	* which however only requires different segments.
761cdf6a HC	387	*/
	388	if (!INITRD_START \|\| !INITRD_SIZE)
	389	return;
27e7318c	390	if (INITRD_START >= min_initrd_addr)
761cdf6a	391	return;
27e7318c HC	392	memmove((void ) min_initrd_addr, (void ) INITRD_START, INITRD_SIZE);
27e7318c HC	393	INITRD_START = min_initrd_addr;
761cdf6a HC	394	#endif
	395	}
	396
a0443fbb	397	/* Set up boot command line */
684d2fd4	398	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	399	{
684d2fd4 HB	400	char parm, delim;
	401	size_t rc, len;
	402
	403	len = strlen(boot_command_line);
a0443fbb	404
684d2fd4 HB	405	delim = boot_command_line + len; /* '\0' character position */
	406	parm = boot_command_line + len + 1; /* append right after '\0' */
	407
	408	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	409	if (rc) {
	410	if (*parm == '=')
	411	memmove(boot_command_line, parm + 1, rc);
	412	else
	413	delim = ' '; / replace '\0' with space */
	414	}
	415	}
	416
1fb81057	417	static inline int has_ebcdic_char(const char *str)
684d2fd4	418	{
61fd330d MS	419	int i;
61fd330d MS	420
1fb81057 MH	421	for (i = 0; str[i]; i++)
	422	if (str[i] & 0x80)
	423	return 1;
	424	return 0;
	425	}
61fd330d	426
1fb81057 MH	427	static void __init setup_boot_command_line(void)
	428	{
	429	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	430	/* convert arch command line to ascii if necessary */
	431	if (has_ebcdic_char(COMMAND_LINE))
	432	EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb	433	/* copy arch command line */
61fd330d MS	434	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
61fd330d MS	435	ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	436
a0443fbb HB	437	/* append IPL PARM data to the boot command line */
684d2fd4 HB	438	if (MACHINE_IS_VM)
	439	append_to_cmdline(append_ipl_vmparm);
	440
	441	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	442	}
	443
	444
ab14de6c HC	445	/*
	446	* Save ipl parameters, clear bss memory, initialize storage keys
	447	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	448	*/
	449	void __init startup_init(void)
	450	{
b6112ccb	451	reset_tod_clock();
ab14de6c	452	ipl_save_parameters();
761cdf6a	453	rescue_initrd();
ab14de6c HC	454	clear_bss_section();
	455	init_kernel_storage_key();
	456	lockdep_init();
	457	lockdep_off();
ab14de6c HC	458	sort_main_extable();
ab14de6c HC	459	setup_lowcore_early();
14375bc4	460	setup_facility_list();
a0443fbb HB	461	detect_machine_type();
	462	ipl_update_parameters();
	463	setup_boot_command_line();
	464	create_kernel_nss();
2e5061e4 HC	465	detect_mvpg();
	466	detect_ieee();
	467	detect_csp();
	468	detect_diag9c();
	469	detect_diag44();
	470	detect_machine_facilities();
53492b1d	471	setup_hpage();
83119ad4	472	sclp_facilities_detect();
23d17421	473	detect_memory_layout(memory_chunk);
dfd9f7ab HC	474	#ifdef CONFIG_DYNAMIC_FTRACE
	475	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
	476	#endif
ab14de6c HC	477	lockdep_on();
ab14de6c HC	478	}