[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>
 */

#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 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 __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) {
		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))
		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
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
a0443fbb HB	38	static void __init setup_boot_command_line(void);
a0443fbb HB	39
b6112ccb MS	40	/*
	41	* Get the TOD clock running.
	42	*/
	43	static void __init reset_tod_clock(void)
	44	{
	45	u64 time;
	46
	47	if (store_clock(&time) == 0)
	48	return;
	49	/* TOD clock not running. Set the clock to Unix Epoch. */
	50	if (set_clock(TOD_UNIX_EPOCH) != 0 \|\| store_clock(&time) != 0)
	51	disabled_wait(0);
	52
	53	sched_clock_base_cc = TOD_UNIX_EPOCH;
	54	}
a0443fbb	55
ab14de6c	56	#ifdef CONFIG_SHARED_KERNEL
a0443fbb HB	57	int __init savesys_ipl_nss(char *cmd, const int cmdlen);
	58
	59	asm(
	60	" .section .init.text,\"ax\",@progbits\n"
	61	" .align 4\n"
	62	" .type savesys_ipl_nss, @function\n"
	63	"savesys_ipl_nss:\n"
	64	#ifdef CONFIG_64BIT
	65	" stmg 6,15,48(15)\n"
	66	" lgr 14,3\n"
	67	" sam31\n"
	68	" diag 2,14,0x8\n"
	69	" sam64\n"
	70	" lgr 2,14\n"
	71	" lmg 6,15,48(15)\n"
	72	#else
	73	" stm 6,15,24(15)\n"
	74	" lr 14,3\n"
	75	" diag 2,14,0x8\n"
	76	" lr 2,14\n"
	77	" lm 6,15,24(15)\n"
	78	#endif
	79	" br 14\n"
	80	" .size savesys_ipl_nss, .-savesys_ipl_nss\n");
	81
684d2fd4 HB	82	static __initdata char upper_command_line[COMMAND_LINE_SIZE];
684d2fd4 HB	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	92	char *savesys_ptr;
ab14de6c HC	93	char defsys_cmd[DEFSYS_CMD_SIZE];
	94	char savesys_cmd[SAVESYS_CMD_SIZE];
	95
	96	/* Do nothing if we are not running under VM */
	97	if (!MACHINE_IS_VM)
	98	return;
	99
	100	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	101	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	102	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	103
	104	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	105
	106	if (!savesys_ptr)
	107	return;
	108
	109	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	110	for (i = 0; i < NSS_NAME_SIZE; i++) {
	111	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	112	break;
	113	kernel_nss_name[i] = savesys_ptr[i];
	114	}
	115
	116	stext_pfn = PFN_DOWN(__pa(&_stext));
	117	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	118	end_pfn = PFN_UP(__pa(&_end));
	119	min_size = end_pfn << 2;
	120
	121	sprintf(defsys_cmd, "DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	122	kernel_nss_name, stext_pfn - 1, stext_pfn, eshared_pfn - 1,
	123	eshared_pfn, end_pfn);
	124
	125	#ifdef CONFIG_BLK_DEV_INITRD
	126	if (INITRD_START && INITRD_SIZE) {
	127	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	128	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	129	min_size = einitrd_pfn << 2;
	130	sprintf(defsys_cmd, "%s EW %.5X-%.5X", defsys_cmd,
	131	sinitrd_pfn, einitrd_pfn);
	132	}
	133	#endif
	134
a0443fbb HB	135	sprintf(defsys_cmd, "%s EW MINSIZE=%.7iK PARMREGS=0-13",
a0443fbb HB	136	defsys_cmd, min_size);
ab14de6c HC	137	sprintf(savesys_cmd, "SAVESYS %s \n IPL %s",
	138	kernel_nss_name, kernel_nss_name);
	139
	140	__cpcmd(defsys_cmd, NULL, 0, &response);
	141
583b33bc HY	142	if (response != 0) {
583b33bc HY	143	kernel_nss_name[0] = '\0';
ab14de6c	144	return;
583b33bc	145	}
ab14de6c	146
a0443fbb HB	147	len = strlen(savesys_cmd);
	148	ASCEBC(savesys_cmd, len);
	149	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	150
a0443fbb HB	151	/* On success: response is equal to the command size,
	152	* max SAVESYS_CMD_SIZE
	153	* On error: response contains the numeric portion of cp error message.
	154	* for SAVESYS it will be >= 263
	155	*/
	156	if (response > SAVESYS_CMD_SIZE) {
583b33bc	157	kernel_nss_name[0] = '\0';
ab14de6c	158	return;
583b33bc	159	}
ab14de6c	160
a0443fbb HB	161	/* re-setup boot command line with new ipl vm parms */
	162	ipl_update_parameters();
	163	setup_boot_command_line();
	164
ab14de6c HC	165	ipl_flags = IPL_NSS_VALID;
	166	}
	167
	168	#else /* CONFIG_SHARED_KERNEL */
	169
	170	static inline void create_kernel_nss(void) { }
	171
	172	#endif /* CONFIG_SHARED_KERNEL */
	173
	174	/*
	175	* Clear bss memory
	176	*/
	177	static noinline __init void clear_bss_section(void)
	178	{
229d9c6d	179	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	180	}
	181
	182	/*
	183	* Initialize storage key for kernel pages
	184	*/
	185	static noinline __init void init_kernel_storage_key(void)
	186	{
	187	unsigned long end_pfn, init_pfn;
	188
	189	end_pfn = PFN_UP(__pa(&_end));
	190
	191	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
	192	page_set_storage_key(init_pfn << PAGE_SHIFT, PAGE_DEFAULT_KEY);
	193	}
	194
92e6ecf3 CB	195	static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
92e6ecf3 CB	196
ab14de6c HC	197	static noinline __init void detect_machine_type(void)
ab14de6c HC	198	{
92e6ecf3 CB	199	/* No VM information? Looks like LPAR */
	200	if (stsi(&vmms, 3, 2, 2) == -ENOSYS)
	201	return;
	202	if (!vmms.count)
	203	return;
ab14de6c	204
92e6ecf3 CB	205	/* Running under KVM? If not we assume z/VM */
92e6ecf3 CB	206	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	207	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	208	else
d3135e0c	209	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	210	}
ab14de6c HC	211
5f954c34	212	static __init void early_pgm_check_handler(void)
ab14de6c HC	213	{
	214	unsigned long addr;
	215	const struct exception_table_entry *fixup;
	216
	217	addr = S390_lowcore.program_old_psw.addr;
	218	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	219	if (!fixup)
	220	disabled_wait(0);
	221	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	222	}
	223
5f954c34	224	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	225	{
	226	psw_t psw;
	227
	228	psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
	229	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	230	S390_lowcore.external_new_psw = psw;
	231	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	232	S390_lowcore.program_new_psw = psw;
	233	s390_base_pgm_handler_fn = early_pgm_check_handler;
	234	}
	235
53492b1d GS	236	static noinline __init void setup_hpage(void)
	237	{
	238	#ifndef CONFIG_DEBUG_PAGEALLOC
	239	unsigned int facilities;
	240
	241	facilities = stfl();
	242	if (!(facilities & (1UL << 23)) \|\| !(facilities & (1UL << 29)))
	243	return;
d3135e0c	244	S390_lowcore.machine_flags \|= MACHINE_FLAG_HPAGE;
53492b1d GS	245	__ctl_set_bit(0, 23);
	246	#endif
	247	}
	248
2e5061e4 HC	249	static __init void detect_mvpg(void)
	250	{
	251	#ifndef CONFIG_64BIT
	252	int rc;
	253
	254	asm volatile(
	255	" la 0,0\n"
	256	" mvpg %2,%2\n"
	257	"0: la %0,0\n"
	258	"1:\n"
	259	EX_TABLE(0b,1b)
	260	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	261	if (!rc)
d3135e0c	262	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVPG;
2e5061e4 HC	263	#endif
	264	}
	265
	266	static __init void detect_ieee(void)
	267	{
	268	#ifndef CONFIG_64BIT
	269	int rc, tmp;
	270
	271	asm volatile(
	272	" efpc %1,0\n"
	273	"0: la %0,0\n"
	274	"1:\n"
	275	EX_TABLE(0b,1b)
	276	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	277	if (!rc)
d3135e0c	278	S390_lowcore.machine_flags \|= MACHINE_FLAG_IEEE;
2e5061e4 HC	279	#endif
	280	}
	281
	282	static __init void detect_csp(void)
	283	{
	284	#ifndef CONFIG_64BIT
	285	int rc;
	286
	287	asm volatile(
	288	" la 0,0\n"
	289	" la 1,0\n"
	290	" la 2,4\n"
	291	" csp 0,2\n"
	292	"0: la %0,0\n"
	293	"1:\n"
	294	EX_TABLE(0b,1b)
	295	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	296	if (!rc)
d3135e0c	297	S390_lowcore.machine_flags \|= MACHINE_FLAG_CSP;
2e5061e4 HC	298	#endif
	299	}
	300
	301	static __init void detect_diag9c(void)
	302	{
	303	unsigned int cpu_address;
	304	int rc;
	305
	306	cpu_address = stap();
	307	asm volatile(
	308	" diag %2,0,0x9c\n"
	309	"0: la %0,0\n"
	310	"1:\n"
	311	EX_TABLE(0b,1b)
	312	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	313	if (!rc)
d3135e0c	314	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	315	}
	316
	317	static __init void detect_diag44(void)
	318	{
	319	#ifdef CONFIG_64BIT
	320	int rc;
	321
	322	asm volatile(
	323	" diag 0,0,0x44\n"
	324	"0: la %0,0\n"
	325	"1:\n"
	326	EX_TABLE(0b,1b)
	327	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	328	if (!rc)
d3135e0c	329	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	330	#endif
	331	}
	332
	333	static __init void detect_machine_facilities(void)
	334	{
	335	#ifdef CONFIG_64BIT
	336	unsigned int facilities;
	337
	338	facilities = stfl();
	339	if (facilities & (1 << 28))
d3135e0c	340	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
53492b1d	341	if (facilities & (1 << 23))
d3135e0c	342	S390_lowcore.machine_flags \|= MACHINE_FLAG_PFMF;
2e5061e4	343	if (facilities & (1 << 4))
d3135e0c	344	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVCOS;
2e5061e4 HC	345	#endif
	346	}
	347
761cdf6a HC	348	static __init void rescue_initrd(void)
	349	{
	350	#ifdef CONFIG_BLK_DEV_INITRD
	351	/*
	352	* Move the initrd right behind the bss section in case it starts
	353	* within the bss section. So we don't overwrite it when the bss
	354	* section gets cleared.
	355	*/
	356	if (!INITRD_START \|\| !INITRD_SIZE)
	357	return;
	358	if (INITRD_START >= (unsigned long) __bss_stop)
	359	return;
	360	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	361	INITRD_START = (unsigned long) __bss_stop;
	362	#endif
	363	}
	364
a0443fbb	365	/* Set up boot command line */
684d2fd4	366	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	367	{
684d2fd4 HB	368	char parm, delim;
	369	size_t rc, len;
	370
	371	len = strlen(boot_command_line);
a0443fbb	372
684d2fd4 HB	373	delim = boot_command_line + len; /* '\0' character position */
	374	parm = boot_command_line + len + 1; /* append right after '\0' */
	375
	376	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	377	if (rc) {
	378	if (*parm == '=')
	379	memmove(boot_command_line, parm + 1, rc);
	380	else
	381	delim = ' '; / replace '\0' with space */
	382	}
	383	}
	384
	385	static void __init setup_boot_command_line(void)
	386	{
a0443fbb HB	387	/* copy arch command line */
a0443fbb HB	388	strlcpy(boot_command_line, COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	389
a0443fbb HB	390	/* append IPL PARM data to the boot command line */
684d2fd4 HB	391	if (MACHINE_IS_VM)
	392	append_to_cmdline(append_ipl_vmparm);
	393
	394	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	395	}
	396
	397
ab14de6c HC	398	/*
	399	* Save ipl parameters, clear bss memory, initialize storage keys
	400	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	401	*/
	402	void __init startup_init(void)
	403	{
b6112ccb	404	reset_tod_clock();
ab14de6c	405	ipl_save_parameters();
761cdf6a	406	rescue_initrd();
ab14de6c HC	407	clear_bss_section();
	408	init_kernel_storage_key();
	409	lockdep_init();
	410	lockdep_off();
ab14de6c HC	411	sort_main_extable();
ab14de6c HC	412	setup_lowcore_early();
a0443fbb HB	413	detect_machine_type();
	414	ipl_update_parameters();
	415	setup_boot_command_line();
	416	create_kernel_nss();
2e5061e4 HC	417	detect_mvpg();
	418	detect_ieee();
	419	detect_csp();
	420	detect_diag9c();
	421	detect_diag44();
	422	detect_machine_facilities();
53492b1d	423	setup_hpage();
83119ad4	424	sclp_facilities_detect();
23d17421	425	detect_memory_layout(memory_chunk);
dfd9f7ab HC	426	#ifdef CONFIG_DYNAMIC_FTRACE
	427	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
	428	#endif
ab14de6c HC	429	lockdep_on();
ab14de6c HC	430	}