arch/s390/kernel/early.c - linux - Git at Google

 /*
  *  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/init.h>
 #include <linux/errno.h>
 #include <linux/string.h>
 #include <linux/ctype.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/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);


 #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 noinline __init void detect_machine_type(void)
 {
 	struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;

 	get_cpu_id(&S390_lowcore.cpu_data.cpu_id);

 	/* Running under z/VM ? */
 	if (cpuinfo->cpu_id.version == 0xff)
 		machine_flags |= MACHINE_FLAG_VM;

 	/* Running under KVM ? */
 	if (cpuinfo->cpu_id.version == 0xfe)
 		machine_flags |= MACHINE_FLAG_KVM;
 }

 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);
 	boot_command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0;

 	/* 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)
 {
 	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);
 	lockdep_on();
 }
	/*
	* 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/init.h>
	#include <linux/errno.h>
	#include <linux/string.h>
	#include <linux/ctype.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/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);


	#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 noinline __init void detect_machine_type(void)
	{
	struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;

	get_cpu_id(&S390_lowcore.cpu_data.cpu_id);

	/* Running under z/VM ? */
	if (cpuinfo->cpu_id.version == 0xff)
	machine_flags \|= MACHINE_FLAG_VM;

	/* Running under KVM ? */
	if (cpuinfo->cpu_id.version == 0xfe)
	machine_flags \|= MACHINE_FLAG_KVM;
	}

	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);
	boot_command_line[ARCH_COMMAND_LINE_SIZE - 1] = 0;

	/* 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)
	{
	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);
	lockdep_on();
	}