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

/*
 *  arch/s390/kernel/early.c
 *
 *    Copyright IBM Corp. 2007
 *    Author(s): Hongjie Yang <hongjie@us.ibm.com>,
 *		 Heiko Carstens <heiko.carstens@de.ibm.com>
 */

#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 <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 unsigned long machine_flags;

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;
}

#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 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 upper_command_line[COMMAND_LINE_SIZE];
	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) {
		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
	 */
	if (response > SAVESYS_CMD_SIZE) {
		kernel_nss_name[0] = '\0';
		return;
	}

	/* 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)
{
	/* No VM information? Looks like LPAR */
	if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
		return;
	if (!vmms.count)
		return;

	/* Running under KVM? If not we assume z/VM */
	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
		machine_flags |= MACHINE_FLAG_KVM;
	else
		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;
	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)
		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)
		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)
		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)
		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)
		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))
		machine_flags |= MACHINE_FLAG_IDTE;
	if (facilities & (1 << 23))
		machine_flags |= MACHINE_FLAG_PFMF;
	if (facilities & (1 << 4))
		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 setup_boot_command_line(void)
{
	char *parm = NULL;

	/* 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) {
		parm = boot_command_line + strlen(boot_command_line);
		*parm++ = ' ';
		get_ipl_vmparm(parm);
		if (parm[0] == '=')
			memmove(boot_command_line, parm + 1, strlen(parm));
	}
}


/*
 * 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);
	S390_lowcore.machine_flags = machine_flags;
#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	*
	4	* Copyright IBM Corp. 2007
	5	* Author(s): Hongjie Yang <hongjie@us.ibm.com>,
	6	* Heiko Carstens <heiko.carstens@de.ibm.com>
	7	*/
	8
92e6ecf3	9	#include <linux/compiler.h>
ab14de6c HC	10	#include <linux/init.h>
	11	#include <linux/errno.h>
	12	#include <linux/string.h>
	13	#include <linux/ctype.h>
dfd9f7ab	14	#include <linux/ftrace.h>
ab14de6c HC	15	#include <linux/lockdep.h>
	16	#include <linux/module.h>
	17	#include <linux/pfn.h>
	18	#include <linux/uaccess.h>
a0443fbb	19	#include <asm/ebcdic.h>
46b05d26	20	#include <asm/ipl.h>
ab14de6c HC	21	#include <asm/lowcore.h>
	22	#include <asm/processor.h>
	23	#include <asm/sections.h>
	24	#include <asm/setup.h>
92e6ecf3	25	#include <asm/sysinfo.h>
ab14de6c HC	26	#include <asm/cpcmd.h>
ab14de6c HC	27	#include <asm/sclp.h>
a806170e	28	#include "entry.h"
ab14de6c HC	29
	30	/*
	31	* Create a Kernel NSS if the SAVESYS= parameter is defined
	32	*/
a0443fbb	33	#define DEFSYS_CMD_SIZE 128
ab14de6c HC	34	#define SAVESYS_CMD_SIZE 32
ab14de6c HC	35
ab14de6c HC	36	char kernel_nss_name[NSS_NAME_SIZE + 1];
ab14de6c HC	37
25097bf1 CE	38	static unsigned long machine_flags;
25097bf1 CE	39
a0443fbb HB	40	static void __init setup_boot_command_line(void);
a0443fbb HB	41
b6112ccb MS	42	/*
	43	* Get the TOD clock running.
	44	*/
	45	static void __init reset_tod_clock(void)
	46	{
	47	u64 time;
	48
	49	if (store_clock(&time) == 0)
	50	return;
	51	/* TOD clock not running. Set the clock to Unix Epoch. */
	52	if (set_clock(TOD_UNIX_EPOCH) != 0 \|\| store_clock(&time) != 0)
	53	disabled_wait(0);
	54
	55	sched_clock_base_cc = TOD_UNIX_EPOCH;
	56	}
a0443fbb	57
ab14de6c	58	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	59	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	60
	61	asm(
	62	" .section .init.text,\"ax\",@progbits\n"
	63	" .align 4\n"
	64	" .type savesys_ipl_nss, @function\n"
	65	"savesys_ipl_nss:\n"
	66	#ifdef CONFIG_64BIT
	67	" stmg 6,15,48(15)\n"
	68	" lgr 14,3\n"
	69	" sam31\n"
	70	" diag 2,14,0x8\n"
	71	" sam64\n"
	72	" lgr 2,14\n"
	73	" lmg 6,15,48(15)\n"
	74	#else
	75	" stm 6,15,24(15)\n"
	76	" lr 14,3\n"
	77	" diag 2,14,0x8\n"
	78	" lr 2,14\n"
	79	" lm 6,15,24(15)\n"
	80	#endif
	81	" br 14\n"
	82	" .size savesys_ipl_nss, .-savesys_ipl_nss\n");
	83
ab14de6c HC	84	static noinline __init void create_kernel_nss(void)
	85	{
	86	unsigned int i, stext_pfn, eshared_pfn, end_pfn, min_size;
	87	#ifdef CONFIG_BLK_DEV_INITRD
	88	unsigned int sinitrd_pfn, einitrd_pfn;
	89	#endif
	90	int response;
a0443fbb	91	size_t len;
ab14de6c HC	92	char *savesys_ptr;
	93	char upper_command_line[COMMAND_LINE_SIZE];
	94	char defsys_cmd[DEFSYS_CMD_SIZE];
	95	char savesys_cmd[SAVESYS_CMD_SIZE];
	96
	97	/* Do nothing if we are not running under VM */
	98	if (!MACHINE_IS_VM)
	99	return;
	100
	101	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	102	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	103	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	104
	105	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	106
	107	if (!savesys_ptr)
	108	return;
	109
	110	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	111	for (i = 0; i < NSS_NAME_SIZE; i++) {
	112	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	113	break;
	114	kernel_nss_name[i] = savesys_ptr[i];
	115	}
	116
	117	stext_pfn = PFN_DOWN(__pa(&_stext));
	118	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	119	end_pfn = PFN_UP(__pa(&_end));
	120	min_size = end_pfn << 2;
	121
	122	sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	123	kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
	124	eshared_pfn, end_pfn);
	125
	126	#ifdef CONFIG_BLK_DEV_INITRD
	127	if (INITRD_START && INITRD_SIZE) {
	128	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	129	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	130	min_size = einitrd_pfn << 2;
	131	sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
	132	sinitrd_pfn, einitrd_pfn);
	133	}
	134	#endif
	135
a0443fbb HB	136	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
a0443fbb HB	137	defsys_cmd, min_size);
ab14de6c HC	138	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
	139	kernel_nss_name, kernel_nss_name);
	140
	141	__cpcmd(defsys_cmd, NULL, 0, &response);
	142
583b33bc HY	143	if (response != 0) {
583b33bc HY	144	kernel_nss_name[0] = '\0';
ab14de6c	145	return;
583b33bc	146	}
ab14de6c	147
a0443fbb HB	148	len = strlen(savesys_cmd);
	149	ASCEBC(savesys_cmd, len);
	150	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	151
a0443fbb HB	152	/* On success: response is equal to the command size,
	153	* max SAVESYS_CMD_SIZE
	154	* On error: response contains the numeric portion of cp error message.
	155	* for SAVESYS it will be >= 263
	156	*/
	157	if (response > SAVESYS_CMD_SIZE) {
583b33bc	158	kernel_nss_name[0] = '\0';
ab14de6c	159	return;
583b33bc	160	}
ab14de6c	161
a0443fbb HB	162	/* re-setup boot command line with new ipl vm parms */
	163	ipl_update_parameters();
	164	setup_boot_command_line();
	165
ab14de6c HC	166	ipl_flags = IPL_NSS_VALID;
	167	}
	168
	169	#else /* CONFIG_SHARED_KERNEL */
	170
	171	static inline void create_kernel_nss(void) { }
	172
	173	#endif /* CONFIG_SHARED_KERNEL */
	174
	175	/*
	176	* Clear bss memory
	177	*/
	178	static noinline __init void clear_bss_section(void)
	179	{
229d9c6d	180	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	181	}
	182
	183	/*
	184	* Initialize storage key for kernel pages
	185	*/
	186	static noinline __init void init_kernel_storage_key(void)
	187	{
	188	unsigned long end_pfn, init_pfn;
	189
	190	end_pfn = PFN_UP(__pa(&_end));
	191
	192	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
	193	page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
	194	}
	195
92e6ecf3 CB	196	static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
92e6ecf3 CB	197
ab14de6c HC	198	static noinline __init void detect_machine_type(void)
ab14de6c HC	199	{
92e6ecf3 CB	200	/* No VM information? Looks like LPAR */
	201	if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
	202	return;
	203	if (!vmms.count)
	204	return;
ab14de6c	205
92e6ecf3 CB	206	/* Running under KVM? If not we assume z/VM */
92e6ecf3 CB	207	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
2e5061e4	208	machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3 CB	209	else
92e6ecf3 CB	210	machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	211	}
ab14de6c HC	212
ab14de6c HC	213	static __init void early_pgm_check_handler(void)
	214	{
	215	unsigned long addr;
	216	const struct exception_table_entry *fixup;
	217
	218	addr = S390_lowcore.program_old_psw.addr;
	219	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	220	if (!fixup)
	221	disabled_wait(0);
	222	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	223	}
	224
	225	static noinline __init void setup_lowcore_early(void)
	226	{
	227	psw_t psw;
	228
	229	psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
	230	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	231	S390_lowcore.external_new_psw = psw;
	232	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	233	S390_lowcore.program_new_psw = psw;
	234	s390_base_pgm_handler_fn = early_pgm_check_handler;
	235	}
	236
53492b1d GS	237	static noinline __init void setup_hpage(void)
	238	{
	239	#ifndef CONFIG_DEBUG_PAGEALLOC
	240	unsigned int facilities;
	241
	242	facilities = stfl();
	243	if (!(facilities & (1UL << 23)) \|\| !(facilities & (1UL << 29)))
	244	return;
	245	machine_flags \|= MACHINE_FLAG_HPAGE;
	246	__ctl_set_bit(0, 23);
	247	#endif
	248	}
	249
2e5061e4 HC	250	static __init void detect_mvpg(void)
	251	{
	252	#ifndef CONFIG_64BIT
	253	int rc;
	254
	255	asm volatile(
	256	" la 0,0\n"
	257	" mvpg %2,%2\n"
	258	"0: la %0,0\n"
	259	"1:\n"
	260	EX_TABLE(0b,1b)
	261	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	262	if (!rc)
	263	machine_flags \|= MACHINE_FLAG_MVPG;
	264	#endif
	265	}
	266
	267	static __init void detect_ieee(void)
	268	{
	269	#ifndef CONFIG_64BIT
	270	int rc, tmp;
	271
	272	asm volatile(
	273	" efpc %1,0\n"
	274	"0: la %0,0\n"
	275	"1:\n"
	276	EX_TABLE(0b,1b)
	277	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	278	if (!rc)
	279	machine_flags \|= MACHINE_FLAG_IEEE;
	280	#endif
	281	}
	282
	283	static __init void detect_csp(void)
	284	{
	285	#ifndef CONFIG_64BIT
	286	int rc;
	287
	288	asm volatile(
	289	" la 0,0\n"
	290	" la 1,0\n"
	291	" la 2,4\n"
	292	" csp 0,2\n"
	293	"0: la %0,0\n"
	294	"1:\n"
	295	EX_TABLE(0b,1b)
	296	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	297	if (!rc)
	298	machine_flags \|= MACHINE_FLAG_CSP;
	299	#endif
	300	}
	301
	302	static __init void detect_diag9c(void)
	303	{
	304	unsigned int cpu_address;
	305	int rc;
	306
	307	cpu_address = stap();
	308	asm volatile(
	309	" diag %2,0,0x9c\n"
	310	"0: la %0,0\n"
	311	"1:\n"
	312	EX_TABLE(0b,1b)
	313	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
314	if (!rc)
315	machine_flags \|= MACHINE_FLAG_DIAG9C;
316	}
317
318	static __init void detect_diag44(void)
319	{
320	#ifdef CONFIG_64BIT
321	int rc;
322
323	asm volatile(
324	" diag 0,0,0x44\n"
325	"0: la %0,0\n"
326	"1:\n"
327	EX_TABLE(0b,1b)
328	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
329	if (!rc)
330	machine_flags \|= MACHINE_FLAG_DIAG44;
331	#endif
332	}
333
334	static __init void detect_machine_facilities(void)
335	{
336	#ifdef CONFIG_64BIT
337	unsigned int facilities;
338
339	facilities = stfl();
340	if (facilities & (1 << 28))
341	machine_flags \|= MACHINE_FLAG_IDTE;
53492b1d GS	342	if (facilities & (1 << 23))
53492b1d GS	343	machine_flags \|= MACHINE_FLAG_PFMF;
2e5061e4 HC	344	if (facilities & (1 << 4))
	345	machine_flags \|= MACHINE_FLAG_MVCOS;
	346	#endif
	347	}
	348
761cdf6a HC	349	static __init void rescue_initrd(void)
	350	{
	351	#ifdef CONFIG_BLK_DEV_INITRD
	352	/*
	353	* Move the initrd right behind the bss section in case it starts
	354	* within the bss section. So we don't overwrite it when the bss
	355	* section gets cleared.
	356	*/
	357	if (!INITRD_START \|\| !INITRD_SIZE)
	358	return;
	359	if (INITRD_START >= (unsigned long) __bss_stop)
	360	return;
	361	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	362	INITRD_START = (unsigned long) __bss_stop;
	363	#endif
	364	}
	365
a0443fbb HB	366	/* Set up boot command line */
	367	static void __init setup_boot_command_line(void)
	368	{
	369	char *parm = NULL;
	370
	371	/* copy arch command line */
	372	strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	373
	374	/* append IPL PARM data to the boot command line */
	375	if (MACHINE_IS_VM) {
	376	parm = boot_command_line + strlen(boot_command_line);
	377	*parm++ = ' ';
	378	get_ipl_vmparm(parm);
	379	if (parm[0] == '=')
	380	memmove(boot_command_line, parm + 1, strlen(parm));
	381	}
	382	}
	383
	384
ab14de6c HC	385	/*
	386	* Save ipl parameters, clear bss memory, initialize storage keys
	387	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	388	*/
	389	void __init startup_init(void)
	390	{
b6112ccb	391	reset_tod_clock();
ab14de6c	392	ipl_save_parameters();
761cdf6a	393	rescue_initrd();
ab14de6c HC	394	clear_bss_section();
	395	init_kernel_storage_key();
	396	lockdep_init();
	397	lockdep_off();
ab14de6c HC	398	sort_main_extable();
ab14de6c HC	399	setup_lowcore_early();
a0443fbb HB	400	detect_machine_type();
	401	ipl_update_parameters();
	402	setup_boot_command_line();
	403	create_kernel_nss();
2e5061e4 HC	404	detect_mvpg();
	405	detect_ieee();
	406	detect_csp();
	407	detect_diag9c();
	408	detect_diag44();
	409	detect_machine_facilities();
53492b1d	410	setup_hpage();
83119ad4	411	sclp_facilities_detect();
23d17421	412	detect_memory_layout(memory_chunk);
25097bf1	413	S390_lowcore.machine_flags = machine_flags;
dfd9f7ab HC	414	#ifdef CONFIG_DYNAMIC_FTRACE
	415	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
	416	#endif
ab14de6c HC	417	lockdep_on();
ab14de6c HC	418	}