[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_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"
#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_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;
}

static __init void setup_topology(void)
{
#ifdef CONFIG_64BIT
	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;
#endif
}

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

	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 = extable_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 __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(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(66))
		S390_lowcore.machine_flags |= MACHINE_FLAG_RRBM;
#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();
	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_topology();
	sclp_early_detect();
#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
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"
	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	175	/* re-initialize cputime accounting. */
1aae0560	176	sched_clock_base_cc = get_tod_clock();
b89031e0 MS	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	{
127c1fef	209	#if PAGE_DEFAULT_KEY
ab14de6c HC	210	unsigned long end_pfn, init_pfn;
	211
	212	end_pfn = PFN_UP(__pa(&_end));
	213
	214	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	215	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	216	PAGE_DEFAULT_KEY, 0);
127c1fef	217	#endif
ab14de6c HC	218	}
ab14de6c HC	219
fade4dc4	220	static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);
92e6ecf3	221
ab14de6c HC	222	static noinline __init void detect_machine_type(void)
ab14de6c HC	223	{
fade4dc4 HC	224	struct sysinfo_3_2_2 vmms = (struct sysinfo_3_2_2 )&sysinfo_page;
fade4dc4 HC	225
27d71602	226	/* Check current-configuration-level */
caf757c6	227	if (stsi(NULL, 0, 0, 0) <= 2) {
27d71602	228	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	229	return;
27d71602 MS	230	}
27d71602 MS	231	/* Get virtual-machine cpu information. */
caf757c6	232	if (stsi(vmms, 3, 2, 2) \|\| !vmms->count)
92e6ecf3	233	return;
ab14de6c	234
92e6ecf3	235	/* Running under KVM? If not we assume z/VM */
fade4dc4	236	if (!memcmp(vmms->vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	237	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	238	else
d3135e0c	239	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	240	}
ab14de6c HC	241
fade4dc4 HC	242	static __init void setup_topology(void)
	243	{
	244	#ifdef CONFIG_64BIT
	245	int max_mnest;
	246
	247	if (!test_facility(11))
	248	return;
	249	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
	250	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
caf757c6	251	if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
fade4dc4 HC	252	break;
	253	}
	254	topology_max_mnest = max_mnest;
	255	#endif
	256	}
	257
a3415703	258	static void early_pgm_check_handler(void)
ab14de6c	259	{
ab14de6c	260	const struct exception_table_entry *fixup;
eb608fb3	261	unsigned long addr;
ab14de6c HC	262
	263	addr = S390_lowcore.program_old_psw.addr;
	264	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	265	if (!fixup)
	266	disabled_wait(0);
eb608fb3	267	S390_lowcore.program_old_psw.addr = extable_fixup(fixup)\|PSW_ADDR_AMODE;
ab14de6c HC	268	}
ab14de6c HC	269
5f954c34	270	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	271	{
	272	psw_t psw;
	273
b50511e4	274	psw.mask = PSW_MASK_BASE \| PSW_DEFAULT_KEY \| PSW_MASK_EA \| PSW_MASK_BA;
ab14de6c HC	275	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	276	S390_lowcore.external_new_psw = psw;
	277	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	278	S390_lowcore.program_new_psw = psw;
	279	s390_base_pgm_handler_fn = early_pgm_check_handler;
	280	}
	281
14375bc4 MS	282	static noinline __init void setup_facility_list(void)
14375bc4 MS	283	{
3ab121ab MH	284	stfle(S390_lowcore.stfle_fac_list,
3ab121ab MH	285	ARRAY_SIZE(S390_lowcore.stfle_fac_list));
14375bc4 MS	286	}
14375bc4 MS	287
2e5061e4 HC	288	static __init void detect_mvpg(void)
	289	{
	290	#ifndef CONFIG_64BIT
	291	int rc;
	292
	293	asm volatile(
	294	" la 0,0\n"
	295	" mvpg %2,%2\n"
	296	"0: la %0,0\n"
	297	"1:\n"
	298	EX_TABLE(0b,1b)
	299	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	300	if (!rc)
d3135e0c	301	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVPG;
2e5061e4 HC	302	#endif
	303	}
	304
	305	static __init void detect_ieee(void)
	306	{
	307	#ifndef CONFIG_64BIT
	308	int rc, tmp;
	309
	310	asm volatile(
	311	" efpc %1,0\n"
	312	"0: la %0,0\n"
	313	"1:\n"
	314	EX_TABLE(0b,1b)
	315	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	316	if (!rc)
d3135e0c	317	S390_lowcore.machine_flags \|= MACHINE_FLAG_IEEE;
2e5061e4 HC	318	#endif
	319	}
	320
	321	static __init void detect_csp(void)
	322	{
	323	#ifndef CONFIG_64BIT
	324	int rc;
	325
	326	asm volatile(
	327	" la 0,0\n"
	328	" la 1,0\n"
	329	" la 2,4\n"
	330	" csp 0,2\n"
	331	"0: la %0,0\n"
	332	"1:\n"
	333	EX_TABLE(0b,1b)
	334	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	335	if (!rc)
d3135e0c	336	S390_lowcore.machine_flags \|= MACHINE_FLAG_CSP;
2e5061e4 HC	337	#endif
	338	}
	339
	340	static __init void detect_diag9c(void)
	341	{
	342	unsigned int cpu_address;
	343	int rc;
	344
	345	cpu_address = stap();
	346	asm volatile(
	347	" diag %2,0,0x9c\n"
	348	"0: la %0,0\n"
	349	"1:\n"
	350	EX_TABLE(0b,1b)
	351	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	352	if (!rc)
d3135e0c	353	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	354	}
	355
	356	static __init void detect_diag44(void)
	357	{
	358	#ifdef CONFIG_64BIT
	359	int rc;
	360
	361	asm volatile(
	362	" diag 0,0,0x44\n"
	363	"0: la %0,0\n"
	364	"1:\n"
	365	EX_TABLE(0b,1b)
	366	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	367	if (!rc)
d3135e0c	368	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	369	#endif
	370	}
	371
	372	static __init void detect_machine_facilities(void)
	373	{
	374	#ifdef CONFIG_64BIT
3c7ef08b HC	375	if (test_facility(8)) {
	376	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT1;
	377	__ctl_set_bit(0, 23);
	378	}
85e9d0e5 HC	379	if (test_facility(78))
85e9d0e5 HC	380	S390_lowcore.machine_flags \|= MACHINE_FLAG_EDAT2;
14375bc4	381	if (test_facility(3))
d3135e0c	382	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
14375bc4	383	if (test_facility(40))
23d18e8d	384	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPP;
d35339a4 MS	385	if (test_facility(50) && test_facility(73))
d35339a4 MS	386	S390_lowcore.machine_flags \|= MACHINE_FLAG_TE;
1ae1c1d0 GS	387	if (test_facility(66))
1ae1c1d0 GS	388	S390_lowcore.machine_flags \|= MACHINE_FLAG_RRBM;
2e5061e4 HC	389	#endif
	390	}
	391
761cdf6a HC	392	static __init void rescue_initrd(void)
	393	{
	394	#ifdef CONFIG_BLK_DEV_INITRD
27e7318c	395	unsigned long min_initrd_addr = (unsigned long) _end + (4UL << 20);
761cdf6a	396	/*
27e7318c HC	397	* Just like in case of IPL from VM reader we make sure there is a
	398	* gap of 4MB between end of kernel and start of initrd.
	399	* That way we can also be sure that saving an NSS will succeed,
	400	* which however only requires different segments.
761cdf6a HC	401	*/
	402	if (!INITRD_START \|\| !INITRD_SIZE)
	403	return;
27e7318c	404	if (INITRD_START >= min_initrd_addr)
761cdf6a	405	return;
27e7318c HC	406	memmove((void ) min_initrd_addr, (void ) INITRD_START, INITRD_SIZE);
27e7318c HC	407	INITRD_START = min_initrd_addr;
761cdf6a HC	408	#endif
	409	}
	410
a0443fbb	411	/* Set up boot command line */
684d2fd4	412	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	413	{
684d2fd4 HB	414	char parm, delim;
	415	size_t rc, len;
	416
	417	len = strlen(boot_command_line);
a0443fbb	418
684d2fd4 HB	419	delim = boot_command_line + len; /* '\0' character position */
	420	parm = boot_command_line + len + 1; /* append right after '\0' */
	421
	422	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	423	if (rc) {
	424	if (*parm == '=')
	425	memmove(boot_command_line, parm + 1, rc);
	426	else
	427	delim = ' '; / replace '\0' with space */
	428	}
	429	}
	430
1fb81057	431	static inline int has_ebcdic_char(const char *str)
684d2fd4	432	{
61fd330d MS	433	int i;
61fd330d MS	434
1fb81057 MH	435	for (i = 0; str[i]; i++)
	436	if (str[i] & 0x80)
	437	return 1;
	438	return 0;
	439	}
61fd330d	440
1fb81057 MH	441	static void __init setup_boot_command_line(void)
	442	{
	443	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	444	/* convert arch command line to ascii if necessary */
	445	if (has_ebcdic_char(COMMAND_LINE))
	446	EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb	447	/* copy arch command line */
61fd330d MS	448	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
61fd330d MS	449	ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	450
a0443fbb HB	451	/* append IPL PARM data to the boot command line */
684d2fd4 HB	452	if (MACHINE_IS_VM)
	453	append_to_cmdline(append_ipl_vmparm);
	454
	455	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	456	}
a0443fbb HB	457
ab14de6c HC	458	/*
	459	* Save ipl parameters, clear bss memory, initialize storage keys
	460	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	461	*/
	462	void __init startup_init(void)
	463	{
b6112ccb	464	reset_tod_clock();
ab14de6c	465	ipl_save_parameters();
761cdf6a	466	rescue_initrd();
ab14de6c HC	467	clear_bss_section();
	468	init_kernel_storage_key();
	469	lockdep_init();
	470	lockdep_off();
ab14de6c	471	setup_lowcore_early();
14375bc4	472	setup_facility_list();
a0443fbb HB	473	detect_machine_type();
	474	ipl_update_parameters();
	475	setup_boot_command_line();
	476	create_kernel_nss();
2e5061e4 HC	477	detect_mvpg();
	478	detect_ieee();
	479	detect_csp();
	480	detect_diag9c();
	481	detect_diag44();
	482	detect_machine_facilities();
fade4dc4	483	setup_topology();
7b50da53	484	sclp_early_detect();
dfd9f7ab HC	485	#ifdef CONFIG_DYNAMIC_FTRACE
	486	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
	487	#endif
ab14de6c HC	488	lockdep_on();
ab14de6c HC	489	}