[net-next-2.6.git] / arch / s390 / kernel / early.c

/*
 *  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 "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;
	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;

	sprintf(defsys_cmd, "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;
		sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
		sinitrd_pfn, einitrd_pfn);
	}
#endif

	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
		defsys_cmd, min_size);
	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
		kernel_nss_name, kernel_nss_name);

	__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 __init 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_BASE_BITS | PSW_DEFAULT_KEY;
	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_hpage(void)
{
#ifndef CONFIG_DEBUG_PAGEALLOC
	unsigned int facilities;

	facilities = stfl();
	if (!(facilities & (1UL << 23)) || !(facilities & (1UL << 29)))
		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
	unsigned int facilities;
	unsigned long long facility_bits;

	facilities = stfl();
	if (facilities & (1 << 28))
		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
	if (facilities & (1 << 23))
		S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
	if (facilities & (1 << 4))
		S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
	if ((stfle(&facility_bits, 1) > 0) &&
	    (facility_bits & (1ULL << (63 - 40))))
		S390_lowcore.machine_flags |= MACHINE_FLAG_SPP;
#endif
}

static __init void rescue_initrd(void)
{
#ifdef CONFIG_BLK_DEV_INITRD
	/*
	 * Move the initrd right behind the bss section in case it starts
	 * within the bss section. So we don't overwrite it when the bss
	 * section gets cleared.
	 */
	if (!INITRD_START || !INITRD_SIZE)
		return;
	if (INITRD_START >= (unsigned long) __bss_stop)
		return;
	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	INITRD_START = (unsigned long) __bss_stop;
#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 void __init setup_boot_command_line(void)
{
	int i;

	/* convert arch command line to ascii */
	for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++)
		if (COMMAND_LINE[i] & 0x80)
			break;
	if (i < ARCH_COMMAND_LINE_SIZE)
		EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0;

	/* 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();
	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 HC	1	/*
	2	* arch/s390/kernel/early.c
	3	*
155af2f9	4	* Copyright IBM Corp. 2007, 2009
ab14de6c HC	5	* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
	6	* Heiko Carstens <heiko.carstens@de.ibm.com>
	7	*/
	8
11af97e1 HB	9	#define KMSG_COMPONENT "setup"
	10	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	11
92e6ecf3	12	#include <linux/compiler.h>
ab14de6c HC	13	#include <linux/init.h>
	14	#include <linux/errno.h>
	15	#include <linux/string.h>
	16	#include <linux/ctype.h>
dfd9f7ab	17	#include <linux/ftrace.h>
ab14de6c HC	18	#include <linux/lockdep.h>
	19	#include <linux/module.h>
	20	#include <linux/pfn.h>
	21	#include <linux/uaccess.h>
11af97e1	22	#include <linux/kernel.h>
a0443fbb	23	#include <asm/ebcdic.h>
46b05d26	24	#include <asm/ipl.h>
ab14de6c HC	25	#include <asm/lowcore.h>
	26	#include <asm/processor.h>
	27	#include <asm/sections.h>
	28	#include <asm/setup.h>
92e6ecf3	29	#include <asm/sysinfo.h>
ab14de6c HC	30	#include <asm/cpcmd.h>
ab14de6c HC	31	#include <asm/sclp.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
	51	if (store_clock(&time) == 0)
	52	return;
	53	/* TOD clock not running. Set the clock to Unix Epoch. */
	54	if (set_clock(TOD_UNIX_EPOCH) != 0 \|\| store_clock(&time) != 0)
	55	disabled_wait(0);
	56
	57	sched_clock_base_cc = TOD_UNIX_EPOCH;
b89031e0	58	S390_lowcore.last_update_clock = sched_clock_base_cc;
b6112ccb	59	}
a0443fbb	60
ab14de6c	61	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	62	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	63
	64	asm(
	65	" .section .init.text,\"ax\",@progbits\n"
	66	" .align 4\n"
	67	" .type savesys_ipl_nss, @function\n"
	68	"savesys_ipl_nss:\n"
	69	#ifdef CONFIG_64BIT
	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"
	77	#else
	78	" stm 6,15,24(15)\n"
	79	" lr 14,3\n"
	80	" diag 2,14,0x8\n"
	81	" lr 2,14\n"
	82	" lm 6,15,24(15)\n"
	83	#endif
	84	" br 14\n"
18764463 HC	85	" .size savesys_ipl_nss, .-savesys_ipl_nss\n"
18764463 HC	86	" .previous\n");
a0443fbb	87
684d2fd4 HB	88	static __initdata char upper_command_line[COMMAND_LINE_SIZE];
684d2fd4 HB	89
ab14de6c HC	90	static noinline __init void create_kernel_nss(void)
	91	{
	92	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	93	#ifdef CONFIG_BLK_DEV_INITRD
	94	unsigned int sinitrd_pfn, einitrd_pfn;
	95	#endif
	96	int response;
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
	127	sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	128	kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
	129	eshared_pfn, end_pfn);
	130
	131	#ifdef CONFIG_BLK_DEV_INITRD
	132	if (INITRD_START && INITRD_SIZE) {
	133	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	134	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	135	min_size = einitrd_pfn << 2;
	136	sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
	137	sinitrd_pfn, einitrd_pfn);
	138	}
	139	#endif
	140
a0443fbb HB	141	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
a0443fbb HB	142	defsys_cmd, min_size);
ab14de6c HC	143	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
	144	kernel_nss_name, kernel_nss_name);
	145
	146	__cpcmd(defsys_cmd, NULL, 0, &response);
	147
583b33bc	148	if (response != 0) {
11af97e1 HB	149	pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
11af97e1 HB	150	response);
583b33bc	151	kernel_nss_name[0] = '\0';
ab14de6c	152	return;
583b33bc	153	}
ab14de6c	154
a0443fbb HB	155	len = strlen(savesys_cmd);
	156	ASCEBC(savesys_cmd, len);
	157	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	158
a0443fbb HB	159	/* On success: response is equal to the command size,
	160	* max SAVESYS_CMD_SIZE
	161	* On error: response contains the numeric portion of cp error message.
	162	* for SAVESYS it will be >= 263
11af97e1	163	* for missing privilege class, it will be 1
a0443fbb	164	*/
11af97e1 HB	165	if (response > SAVESYS_CMD_SIZE \|\| response == 1) {
	166	pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
	167	response);
583b33bc	168	kernel_nss_name[0] = '\0';
ab14de6c	169	return;
583b33bc	170	}
ab14de6c	171
b89031e0 MS	172	/* re-initialize cputime accounting. */
	173	sched_clock_base_cc = get_clock();
	174	S390_lowcore.last_update_clock = sched_clock_base_cc;
	175	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	176	S390_lowcore.user_timer = 0;
	177	S390_lowcore.system_timer = 0;
	178	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
	179
a0443fbb HB	180	/* re-setup boot command line with new ipl vm parms */
	181	ipl_update_parameters();
	182	setup_boot_command_line();
	183
ab14de6c HC	184	ipl_flags = IPL_NSS_VALID;
	185	}
	186
	187	#else /* CONFIG_SHARED_KERNEL */
	188
	189	static inline void create_kernel_nss(void) { }
	190
	191	#endif /* CONFIG_SHARED_KERNEL */
	192
	193	/*
	194	* Clear bss memory
	195	*/
	196	static noinline __init void clear_bss_section(void)
	197	{
229d9c6d	198	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	199	}
	200
	201	/*
	202	* Initialize storage key for kernel pages
	203	*/
	204	static noinline __init void init_kernel_storage_key(void)
	205	{
	206	unsigned long end_pfn, init_pfn;
	207
	208	end_pfn = PFN_UP(__pa(&_end));
	209
	210	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	211	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	212	PAGE_DEFAULT_KEY, 0);
ab14de6c HC	213	}
ab14de6c HC	214
92e6ecf3 CB	215	static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
92e6ecf3 CB	216
ab14de6c HC	217	static noinline __init void detect_machine_type(void)
ab14de6c HC	218	{
27d71602 MS	219	/* Check current-configuration-level */
	220	if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
	221	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	222	return;
27d71602 MS	223	}
	224	/* Get virtual-machine cpu information. */
	225	if (stsi(&vmms, 3, 2, 2) == -ENOSYS \|\| !vmms.count)
92e6ecf3	226	return;
ab14de6c	227
92e6ecf3 CB	228	/* Running under KVM? If not we assume z/VM */
92e6ecf3 CB	229	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	230	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	231	else
d3135e0c	232	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	233	}
ab14de6c HC	234
5f954c34	235	static __init void early_pgm_check_handler(void)
ab14de6c HC	236	{
	237	unsigned long addr;
	238	const struct exception_table_entry *fixup;
	239
	240	addr = S390_lowcore.program_old_psw.addr;
	241	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	242	if (!fixup)
	243	disabled_wait(0);
	244	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	245	}
	246
5f954c34	247	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	248	{
	249	psw_t psw;
	250
	251	psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
	252	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	253	S390_lowcore.external_new_psw = psw;
	254	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	255	S390_lowcore.program_new_psw = psw;
	256	s390_base_pgm_handler_fn = early_pgm_check_handler;
	257	}
	258
53492b1d GS	259	static noinline __init void setup_hpage(void)
	260	{
	261	#ifndef CONFIG_DEBUG_PAGEALLOC
	262	unsigned int facilities;
	263
	264	facilities = stfl();
	265	if (!(facilities & (1UL << 23)) \|\| !(facilities & (1UL << 29)))
	266	return;
d3135e0c	267	S390_lowcore.machine_flags \|= MACHINE_FLAG_HPAGE;
53492b1d GS	268	__ctl_set_bit(0, 23);
	269	#endif
	270	}
	271
2e5061e4 HC	272	static __init void detect_mvpg(void)
	273	{
	274	#ifndef CONFIG_64BIT
	275	int rc;
	276
	277	asm volatile(
	278	" la 0,0\n"
	279	" mvpg %2,%2\n"
	280	"0: la %0,0\n"
	281	"1:\n"
	282	EX_TABLE(0b,1b)
	283	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	284	if (!rc)
d3135e0c	285	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVPG;
2e5061e4 HC	286	#endif
	287	}
	288
	289	static __init void detect_ieee(void)
	290	{
	291	#ifndef CONFIG_64BIT
	292	int rc, tmp;
	293
	294	asm volatile(
	295	" efpc %1,0\n"
	296	"0: la %0,0\n"
	297	"1:\n"
	298	EX_TABLE(0b,1b)
	299	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	300	if (!rc)
d3135e0c	301	S390_lowcore.machine_flags \|= MACHINE_FLAG_IEEE;
2e5061e4 HC	302	#endif
	303	}
	304
	305	static __init void detect_csp(void)
	306	{
	307	#ifndef CONFIG_64BIT
	308	int rc;
	309
	310	asm volatile(
	311	" la 0,0\n"
	312	" la 1,0\n"
	313	" la 2,4\n"
	314	" csp 0,2\n"
	315	"0: la %0,0\n"
	316	"1:\n"
	317	EX_TABLE(0b,1b)
	318	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	319	if (!rc)
d3135e0c	320	S390_lowcore.machine_flags \|= MACHINE_FLAG_CSP;
2e5061e4 HC	321	#endif
	322	}
	323
	324	static __init void detect_diag9c(void)
	325	{
	326	unsigned int cpu_address;
	327	int rc;
	328
	329	cpu_address = stap();
	330	asm volatile(
	331	" diag %2,0,0x9c\n"
	332	"0: la %0,0\n"
	333	"1:\n"
	334	EX_TABLE(0b,1b)
	335	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	336	if (!rc)
d3135e0c	337	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	338	}
	339
	340	static __init void detect_diag44(void)
	341	{
	342	#ifdef CONFIG_64BIT
	343	int rc;
	344
	345	asm volatile(
	346	" diag 0,0,0x44\n"
	347	"0: la %0,0\n"
	348	"1:\n"
	349	EX_TABLE(0b,1b)
	350	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	351	if (!rc)
d3135e0c	352	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	353	#endif
	354	}
	355
	356	static __init void detect_machine_facilities(void)
	357	{
	358	#ifdef CONFIG_64BIT
	359	unsigned int facilities;
cd3b70f5	360	unsigned long long facility_bits;
2e5061e4 HC	361
	362	facilities = stfl();
	363	if (facilities & (1 << 28))
d3135e0c	364	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
53492b1d	365	if (facilities & (1 << 23))
d3135e0c	366	S390_lowcore.machine_flags \|= MACHINE_FLAG_PFMF;
2e5061e4	367	if (facilities & (1 << 4))
d3135e0c	368	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVCOS;
cd3b70f5 CO	369	if ((stfle(&facility_bits, 1) > 0) &&
	370	(facility_bits & (1ULL << (63 - 40))))
	371	S390_lowcore.machine_flags \|= MACHINE_FLAG_SPP;
2e5061e4 HC	372	#endif
	373	}
	374
761cdf6a HC	375	static __init void rescue_initrd(void)
	376	{
	377	#ifdef CONFIG_BLK_DEV_INITRD
	378	/*
	379	* Move the initrd right behind the bss section in case it starts
	380	* within the bss section. So we don't overwrite it when the bss
	381	* section gets cleared.
	382	*/
	383	if (!INITRD_START \|\| !INITRD_SIZE)
	384	return;
	385	if (INITRD_START >= (unsigned long) __bss_stop)
	386	return;
	387	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	388	INITRD_START = (unsigned long) __bss_stop;
	389	#endif
	390	}
	391
a0443fbb	392	/* Set up boot command line */
684d2fd4	393	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	394	{
684d2fd4 HB	395	char parm, delim;
	396	size_t rc, len;
	397
	398	len = strlen(boot_command_line);
a0443fbb	399
684d2fd4 HB	400	delim = boot_command_line + len; /* '\0' character position */
	401	parm = boot_command_line + len + 1; /* append right after '\0' */
	402
	403	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	404	if (rc) {
	405	if (*parm == '=')
	406	memmove(boot_command_line, parm + 1, rc);
	407	else
	408	delim = ' '; / replace '\0' with space */
	409	}
	410	}
	411
	412	static void __init setup_boot_command_line(void)
	413	{
61fd330d MS	414	int i;
	415
	416	/* convert arch command line to ascii */
	417	for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++)
	418	if (COMMAND_LINE[i] & 0x80)
	419	break;
	420	if (i < ARCH_COMMAND_LINE_SIZE)
	421	EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
	422	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0;
	423
a0443fbb	424	/* copy arch command line */
61fd330d MS	425	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
61fd330d MS	426	ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	427
a0443fbb HB	428	/* append IPL PARM data to the boot command line */
684d2fd4 HB	429	if (MACHINE_IS_VM)
	430	append_to_cmdline(append_ipl_vmparm);
	431
	432	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	433	}
	434
	435
ab14de6c HC	436	/*
	437	* Save ipl parameters, clear bss memory, initialize storage keys
	438	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	439	*/
	440	void __init startup_init(void)
	441	{
b6112ccb	442	reset_tod_clock();
ab14de6c	443	ipl_save_parameters();
761cdf6a	444	rescue_initrd();
ab14de6c HC	445	clear_bss_section();
	446	init_kernel_storage_key();
	447	lockdep_init();
	448	lockdep_off();
ab14de6c HC	449	sort_main_extable();
ab14de6c HC	450	setup_lowcore_early();
a0443fbb HB	451	detect_machine_type();
	452	ipl_update_parameters();
	453	setup_boot_command_line();
	454	create_kernel_nss();
2e5061e4 HC	455	detect_mvpg();
	456	detect_ieee();
	457	detect_csp();
	458	detect_diag9c();
	459	detect_diag44();
	460	detect_machine_facilities();
53492b1d	461	setup_hpage();
83119ad4	462	sclp_facilities_detect();
23d17421	463	detect_memory_layout(memory_chunk);
dfd9f7ab HC	464	#ifdef CONFIG_DYNAMIC_FTRACE
	465	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
	466	#endif
ab14de6c HC	467	lockdep_on();
ab14de6c HC	468	}