[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");

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);
}

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;

	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;
#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)
{
	/* copy arch command line */
	strlcpy(boot_command_line, 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"
	85	" .size savesys_ipl_nss, .-savesys_ipl_nss\n");
	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;
a0443fbb	96	size_t len;
ab14de6c	97	char *savesys_ptr;
ab14de6c HC	98	char defsys_cmd[DEFSYS_CMD_SIZE];
	99	char savesys_cmd[SAVESYS_CMD_SIZE];
	100
	101	/* Do nothing if we are not running under VM */
	102	if (!MACHINE_IS_VM)
	103	return;
	104
	105	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	106	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	107	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	108
	109	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	110
	111	if (!savesys_ptr)
	112	return;
	113
	114	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	115	for (i = 0; i < NSS_NAME_SIZE; i++) {
	116	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	117	break;
	118	kernel_nss_name[i] = savesys_ptr[i];
	119	}
	120
	121	stext_pfn = PFN_DOWN(__pa(&_stext));
	122	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	123	end_pfn = PFN_UP(__pa(&_end));
	124	min_size = end_pfn << 2;
	125
	126	sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	127	kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
	128	eshared_pfn, end_pfn);
	129
	130	#ifdef CONFIG_BLK_DEV_INITRD
	131	if (INITRD_START && INITRD_SIZE) {
	132	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	133	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	134	min_size = einitrd_pfn << 2;
	135	sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
	136	sinitrd_pfn, einitrd_pfn);
	137	}
	138	#endif
	139
a0443fbb HB	140	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
a0443fbb HB	141	defsys_cmd, min_size);
ab14de6c HC	142	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
	143	kernel_nss_name, kernel_nss_name);
	144
	145	__cpcmd(defsys_cmd, NULL, 0, &response);
	146
583b33bc	147	if (response != 0) {
11af97e1 HB	148	pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
11af97e1 HB	149	response);
583b33bc	150	kernel_nss_name[0] = '\0';
ab14de6c	151	return;
583b33bc	152	}
ab14de6c	153
a0443fbb HB	154	len = strlen(savesys_cmd);
	155	ASCEBC(savesys_cmd, len);
	156	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	157
a0443fbb HB	158	/* On success: response is equal to the command size,
	159	* max SAVESYS_CMD_SIZE
	160	* On error: response contains the numeric portion of cp error message.
	161	* for SAVESYS it will be >= 263
11af97e1	162	* for missing privilege class, it will be 1
a0443fbb	163	*/
11af97e1 HB	164	if (response > SAVESYS_CMD_SIZE \|\| response == 1) {
	165	pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
	166	response);
583b33bc	167	kernel_nss_name[0] = '\0';
ab14de6c	168	return;
583b33bc	169	}
ab14de6c	170
b89031e0 MS	171	/* re-initialize cputime accounting. */
	172	sched_clock_base_cc = get_clock();
	173	S390_lowcore.last_update_clock = sched_clock_base_cc;
	174	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	175	S390_lowcore.user_timer = 0;
	176	S390_lowcore.system_timer = 0;
	177	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
	178
a0443fbb HB	179	/* re-setup boot command line with new ipl vm parms */
	180	ipl_update_parameters();
	181	setup_boot_command_line();
	182
ab14de6c HC	183	ipl_flags = IPL_NSS_VALID;
	184	}
	185
	186	#else /* CONFIG_SHARED_KERNEL */
	187
	188	static inline void create_kernel_nss(void) { }
	189
	190	#endif /* CONFIG_SHARED_KERNEL */
	191
	192	/*
	193	* Clear bss memory
	194	*/
	195	static noinline __init void clear_bss_section(void)
	196	{
229d9c6d	197	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	198	}
	199
	200	/*
	201	* Initialize storage key for kernel pages
	202	*/
	203	static noinline __init void init_kernel_storage_key(void)
	204	{
	205	unsigned long end_pfn, init_pfn;
	206
	207	end_pfn = PFN_UP(__pa(&_end));
	208
	209	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
	210	page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
	211	}
	212
92e6ecf3 CB	213	static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
92e6ecf3 CB	214
ab14de6c HC	215	static noinline __init void detect_machine_type(void)
ab14de6c HC	216	{
27d71602 MS	217	/* Check current-configuration-level */
	218	if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
	219	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	220	return;
27d71602 MS	221	}
	222	/* Get virtual-machine cpu information. */
	223	if (stsi(&vmms, 3, 2, 2) == -ENOSYS \|\| !vmms.count)
92e6ecf3	224	return;
ab14de6c	225
92e6ecf3 CB	226	/* Running under KVM? If not we assume z/VM */
92e6ecf3 CB	227	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	228	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	229	else
d3135e0c	230	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	231	}
ab14de6c HC	232
5f954c34	233	static __init void early_pgm_check_handler(void)
ab14de6c HC	234	{
	235	unsigned long addr;
	236	const struct exception_table_entry *fixup;
	237
	238	addr = S390_lowcore.program_old_psw.addr;
	239	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	240	if (!fixup)
	241	disabled_wait(0);
	242	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	243	}
	244
5f954c34	245	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	246	{
	247	psw_t psw;
	248
	249	psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
	250	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	251	S390_lowcore.external_new_psw = psw;
	252	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	253	S390_lowcore.program_new_psw = psw;
	254	s390_base_pgm_handler_fn = early_pgm_check_handler;
	255	}
	256
53492b1d GS	257	static noinline __init void setup_hpage(void)
	258	{
	259	#ifndef CONFIG_DEBUG_PAGEALLOC
	260	unsigned int facilities;
	261
	262	facilities = stfl();
	263	if (!(facilities & (1UL << 23)) \|\| !(facilities & (1UL << 29)))
	264	return;
d3135e0c	265	S390_lowcore.machine_flags \|= MACHINE_FLAG_HPAGE;
53492b1d GS	266	__ctl_set_bit(0, 23);
	267	#endif
	268	}
	269
2e5061e4 HC	270	static __init void detect_mvpg(void)
	271	{
	272	#ifndef CONFIG_64BIT
	273	int rc;
	274
	275	asm volatile(
	276	" la 0,0\n"
	277	" mvpg %2,%2\n"
	278	"0: la %0,0\n"
	279	"1:\n"
	280	EX_TABLE(0b,1b)
	281	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	282	if (!rc)
d3135e0c	283	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVPG;
2e5061e4 HC	284	#endif
	285	}
	286
	287	static __init void detect_ieee(void)
	288	{
	289	#ifndef CONFIG_64BIT
	290	int rc, tmp;
	291
	292	asm volatile(
	293	" efpc %1,0\n"
	294	"0: la %0,0\n"
	295	"1:\n"
	296	EX_TABLE(0b,1b)
	297	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	298	if (!rc)
d3135e0c	299	S390_lowcore.machine_flags \|= MACHINE_FLAG_IEEE;
2e5061e4 HC	300	#endif
	301	}
	302
	303	static __init void detect_csp(void)
	304	{
	305	#ifndef CONFIG_64BIT
	306	int rc;
	307
	308	asm volatile(
	309	" la 0,0\n"
	310	" la 1,0\n"
	311	" la 2,4\n"
	312	" csp 0,2\n"
	313	"0: la %0,0\n"
	314	"1:\n"
	315	EX_TABLE(0b,1b)
	316	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	317	if (!rc)
d3135e0c	318	S390_lowcore.machine_flags \|= MACHINE_FLAG_CSP;
2e5061e4 HC	319	#endif
	320	}
	321
	322	static __init void detect_diag9c(void)
	323	{
	324	unsigned int cpu_address;
	325	int rc;
	326
	327	cpu_address = stap();
	328	asm volatile(
	329	" diag %2,0,0x9c\n"
	330	"0: la %0,0\n"
	331	"1:\n"
	332	EX_TABLE(0b,1b)
	333	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	334	if (!rc)
d3135e0c	335	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	336	}
	337
	338	static __init void detect_diag44(void)
	339	{
	340	#ifdef CONFIG_64BIT
	341	int rc;
	342
	343	asm volatile(
	344	" diag 0,0,0x44\n"
	345	"0: la %0,0\n"
	346	"1:\n"
	347	EX_TABLE(0b,1b)
	348	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	349	if (!rc)
d3135e0c	350	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	351	#endif
	352	}
	353
	354	static __init void detect_machine_facilities(void)
	355	{
	356	#ifdef CONFIG_64BIT
	357	unsigned int facilities;
	358
	359	facilities = stfl();
	360	if (facilities & (1 << 28))
d3135e0c	361	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
53492b1d	362	if (facilities & (1 << 23))
d3135e0c	363	S390_lowcore.machine_flags \|= MACHINE_FLAG_PFMF;
2e5061e4	364	if (facilities & (1 << 4))
d3135e0c	365	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVCOS;
2e5061e4 HC	366	#endif
	367	}
	368
761cdf6a HC	369	static __init void rescue_initrd(void)
	370	{
	371	#ifdef CONFIG_BLK_DEV_INITRD
	372	/*
	373	* Move the initrd right behind the bss section in case it starts
	374	* within the bss section. So we don't overwrite it when the bss
	375	* section gets cleared.
	376	*/
	377	if (!INITRD_START \|\| !INITRD_SIZE)
	378	return;
	379	if (INITRD_START >= (unsigned long) __bss_stop)
	380	return;
	381	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	382	INITRD_START = (unsigned long) __bss_stop;
	383	#endif
	384	}
	385
a0443fbb	386	/* Set up boot command line */
684d2fd4	387	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	388	{
684d2fd4 HB	389	char parm, delim;
	390	size_t rc, len;
	391
	392	len = strlen(boot_command_line);
a0443fbb	393
684d2fd4 HB	394	delim = boot_command_line + len; /* '\0' character position */
	395	parm = boot_command_line + len + 1; /* append right after '\0' */
	396
	397	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	398	if (rc) {
	399	if (*parm == '=')
	400	memmove(boot_command_line, parm + 1, rc);
	401	else
	402	delim = ' '; / replace '\0' with space */
	403	}
	404	}
	405
	406	static void __init setup_boot_command_line(void)
	407	{
a0443fbb HB	408	/* copy arch command line */
a0443fbb HB	409	strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	410
a0443fbb HB	411	/* append IPL PARM data to the boot command line */
684d2fd4 HB	412	if (MACHINE_IS_VM)
	413	append_to_cmdline(append_ipl_vmparm);
	414
	415	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	416	}
	417
	418
ab14de6c HC	419	/*
	420	* Save ipl parameters, clear bss memory, initialize storage keys
	421	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	422	*/
	423	void __init startup_init(void)
	424	{
b6112ccb	425	reset_tod_clock();
ab14de6c	426	ipl_save_parameters();
761cdf6a	427	rescue_initrd();
ab14de6c HC	428	clear_bss_section();
	429	init_kernel_storage_key();
	430	lockdep_init();
	431	lockdep_off();
ab14de6c HC	432	sort_main_extable();
ab14de6c HC	433	setup_lowcore_early();
a0443fbb HB	434	detect_machine_type();
	435	ipl_update_parameters();
	436	setup_boot_command_line();
	437	create_kernel_nss();
2e5061e4 HC	438	detect_mvpg();
	439	detect_ieee();
	440	detect_csp();
	441	detect_diag9c();
	442	detect_diag44();
	443	detect_machine_facilities();
53492b1d	444	setup_hpage();
83119ad4	445	sclp_facilities_detect();
23d17421	446	detect_memory_layout(memory_chunk);
dfd9f7ab HC	447	#ifdef CONFIG_DYNAMIC_FTRACE
	448	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
	449	#endif
ab14de6c HC	450	lockdep_on();
ab14de6c HC	451	}