[mirror_ubuntu-bionic-kernel.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;
	int hlen;
	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;

	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
			"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;
		hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
				 " EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
	}
#endif

	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
		 " EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
		 kernel_nss_name, kernel_nss_name);
	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';

	__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_facility_list(void)
{
	unsigned long nr;

	S390_lowcore.stfl_fac_list = 0;
	asm volatile(
		"	.insn	s,0xb2b10000,0(0)\n" /* stfl */
		"0:\n"
		EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list));
	memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
	nr = 4;				/* # bytes stored by stfl */
	if (test_facility(7)) {
		/* More facility bits available with stfle */
		register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1;
		asm volatile(".insn s,0xb2b00000,%0" /* stfle */
			     : "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0)
			     : : "cc");
		nr = (reg0 + 1) * 8;	/* # bytes stored by stfle */
	}
	memset((char *) S390_lowcore.stfle_fac_list + nr, 0,
	       MAX_FACILITY_BIT/8 - nr);
}

static noinline __init void setup_hpage(void)
{
#ifndef CONFIG_DEBUG_PAGEALLOC
	if (!test_facility(2) || !test_facility(8))
		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
	if (test_facility(3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
	if (test_facility(8))
		S390_lowcore.machine_flags |= MACHINE_FLAG_PFMF;
	if (test_facility(11))
		S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
	if (test_facility(27))
		S390_lowcore.machine_flags |= MACHINE_FLAG_MVCOS;
	if (test_facility(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();
	setup_facility_list();
	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;
69ac43b0	97	int hlen;
a0443fbb	98	size_t len;
ab14de6c	99	char *savesys_ptr;
ab14de6c HC	100	char defsys_cmd[DEFSYS_CMD_SIZE];
	101	char savesys_cmd[SAVESYS_CMD_SIZE];
	102
	103	/* Do nothing if we are not running under VM */
	104	if (!MACHINE_IS_VM)
	105	return;
	106
	107	/* Convert COMMAND_LINE to upper case */
a0443fbb HB	108	for (i = 0; i < strlen(boot_command_line); i++)
a0443fbb HB	109	upper_command_line[i] = toupper(boot_command_line[i]);
ab14de6c HC	110
	111	savesys_ptr = strstr(upper_command_line, "SAVESYS=");
	112
	113	if (!savesys_ptr)
	114	return;
	115
	116	savesys_ptr += 8; /* Point to the beginning of the NSS name */
	117	for (i = 0; i < NSS_NAME_SIZE; i++) {
	118	if (savesys_ptr[i] == ' ' \|\| savesys_ptr[i] == '\0')
	119	break;
	120	kernel_nss_name[i] = savesys_ptr[i];
	121	}
	122
	123	stext_pfn = PFN_DOWN(__pa(&_stext));
	124	eshared_pfn = PFN_DOWN(__pa(&_eshared));
	125	end_pfn = PFN_UP(__pa(&_end));
	126	min_size = end_pfn << 2;
	127
69ac43b0 CL	128	hlen = snprintf(defsys_cmd, DEFSYS_CMD_SIZE,
	129	"DEFSYS %s 00000-%.5X EW %.5X-%.5X SR %.5X-%.5X",
	130	kernel_nss_name, stext_pfn - 1, stext_pfn,
	131	eshared_pfn - 1, eshared_pfn, end_pfn);
ab14de6c HC	132
	133	#ifdef CONFIG_BLK_DEV_INITRD
	134	if (INITRD_START && INITRD_SIZE) {
	135	sinitrd_pfn = PFN_DOWN(__pa(INITRD_START));
	136	einitrd_pfn = PFN_UP(__pa(INITRD_START + INITRD_SIZE));
	137	min_size = einitrd_pfn << 2;
69ac43b0 CL	138	hlen += snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
69ac43b0 CL	139	" EW %.5X-%.5X", sinitrd_pfn, einitrd_pfn);
ab14de6c HC	140	}
	141	#endif
	142
69ac43b0 CL	143	snprintf(defsys_cmd + hlen, DEFSYS_CMD_SIZE - hlen,
	144	" EW MINSIZE=%.7iK PARMREGS=0-13", min_size);
	145	defsys_cmd[DEFSYS_CMD_SIZE - 1] = '\0';
894e491e HC	146	snprintf(savesys_cmd, SAVESYS_CMD_SIZE, "SAVESYS %s \n IPL %s",
	147	kernel_nss_name, kernel_nss_name);
	148	savesys_cmd[SAVESYS_CMD_SIZE - 1] = '\0';
ab14de6c HC	149
	150	__cpcmd(defsys_cmd, NULL, 0, &response);
	151
583b33bc	152	if (response != 0) {
11af97e1 HB	153	pr_err("Defining the Linux kernel NSS failed with rc=%d\n",
11af97e1 HB	154	response);
583b33bc	155	kernel_nss_name[0] = '\0';
ab14de6c	156	return;
583b33bc	157	}
ab14de6c	158
a0443fbb HB	159	len = strlen(savesys_cmd);
	160	ASCEBC(savesys_cmd, len);
	161	response = savesys_ipl_nss(savesys_cmd, len);
ab14de6c	162
a0443fbb HB	163	/* On success: response is equal to the command size,
	164	* max SAVESYS_CMD_SIZE
	165	* On error: response contains the numeric portion of cp error message.
	166	* for SAVESYS it will be >= 263
11af97e1	167	* for missing privilege class, it will be 1
a0443fbb	168	*/
11af97e1 HB	169	if (response > SAVESYS_CMD_SIZE \|\| response == 1) {
	170	pr_err("Saving the Linux kernel NSS failed with rc=%d\n",
	171	response);
583b33bc	172	kernel_nss_name[0] = '\0';
ab14de6c	173	return;
583b33bc	174	}
ab14de6c	175
b89031e0 MS	176	/* re-initialize cputime accounting. */
	177	sched_clock_base_cc = get_clock();
	178	S390_lowcore.last_update_clock = sched_clock_base_cc;
	179	S390_lowcore.last_update_timer = 0x7fffffffffffffffULL;
	180	S390_lowcore.user_timer = 0;
	181	S390_lowcore.system_timer = 0;
	182	asm volatile("SPT 0(%0)" : : "a" (&S390_lowcore.last_update_timer));
	183
a0443fbb HB	184	/* re-setup boot command line with new ipl vm parms */
	185	ipl_update_parameters();
	186	setup_boot_command_line();
	187
ab14de6c HC	188	ipl_flags = IPL_NSS_VALID;
	189	}
	190
	191	#else /* CONFIG_SHARED_KERNEL */
	192
	193	static inline void create_kernel_nss(void) { }
	194
	195	#endif /* CONFIG_SHARED_KERNEL */
	196
	197	/*
	198	* Clear bss memory
	199	*/
	200	static noinline __init void clear_bss_section(void)
	201	{
229d9c6d	202	memset(__bss_start, 0, __bss_stop - __bss_start);
ab14de6c HC	203	}
	204
	205	/*
	206	* Initialize storage key for kernel pages
	207	*/
	208	static noinline __init void init_kernel_storage_key(void)
	209	{
	210	unsigned long end_pfn, init_pfn;
	211
	212	end_pfn = PFN_UP(__pa(&_end));
	213
	214	for (init_pfn = 0 ; init_pfn < end_pfn; init_pfn++)
e2b8d7af MS	215	page_set_storage_key(init_pfn << PAGE_SHIFT,
e2b8d7af MS	216	PAGE_DEFAULT_KEY, 0);
ab14de6c HC	217	}
ab14de6c HC	218
92e6ecf3 CB	219	static __initdata struct sysinfo_3_2_2 vmms __aligned(PAGE_SIZE);
92e6ecf3 CB	220
ab14de6c HC	221	static noinline __init void detect_machine_type(void)
ab14de6c HC	222	{
27d71602 MS	223	/* Check current-configuration-level */
	224	if ((stsi(NULL, 0, 0, 0) >> 28) <= 2) {
	225	S390_lowcore.machine_flags \|= MACHINE_FLAG_LPAR;
92e6ecf3	226	return;
27d71602 MS	227	}
	228	/* Get virtual-machine cpu information. */
	229	if (stsi(&vmms, 3, 2, 2) == -ENOSYS \|\| !vmms.count)
92e6ecf3	230	return;
ab14de6c	231
92e6ecf3 CB	232	/* Running under KVM? If not we assume z/VM */
92e6ecf3 CB	233	if (!memcmp(vmms.vm[0].cpi, "\xd2\xe5\xd4", 3))
d3135e0c	234	S390_lowcore.machine_flags \|= MACHINE_FLAG_KVM;
92e6ecf3	235	else
d3135e0c	236	S390_lowcore.machine_flags \|= MACHINE_FLAG_VM;
ab14de6c HC	237	}
ab14de6c HC	238
5f954c34	239	static __init void early_pgm_check_handler(void)
ab14de6c HC	240	{
	241	unsigned long addr;
	242	const struct exception_table_entry *fixup;
	243
	244	addr = S390_lowcore.program_old_psw.addr;
	245	fixup = search_exception_tables(addr & PSW_ADDR_INSN);
	246	if (!fixup)
	247	disabled_wait(0);
	248	S390_lowcore.program_old_psw.addr = fixup->fixup \| PSW_ADDR_AMODE;
	249	}
	250
5f954c34	251	static noinline __init void setup_lowcore_early(void)
ab14de6c HC	252	{
	253	psw_t psw;
	254
	255	psw.mask = PSW_BASE_BITS \| PSW_DEFAULT_KEY;
	256	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_ext_handler;
	257	S390_lowcore.external_new_psw = psw;
	258	psw.addr = PSW_ADDR_AMODE \| (unsigned long) s390_base_pgm_handler;
	259	S390_lowcore.program_new_psw = psw;
	260	s390_base_pgm_handler_fn = early_pgm_check_handler;
	261	}
	262
14375bc4 MS	263	static noinline __init void setup_facility_list(void)
	264	{
	265	unsigned long nr;
	266
	267	S390_lowcore.stfl_fac_list = 0;
	268	asm volatile(
	269	" .insn s,0xb2b10000,0(0)\n" /* stfl */
	270	"0:\n"
	271	EX_TABLE(0b,0b) : "=m" (S390_lowcore.stfl_fac_list));
	272	memcpy(&S390_lowcore.stfle_fac_list, &S390_lowcore.stfl_fac_list, 4);
	273	nr = 4; /* # bytes stored by stfl */
	274	if (test_facility(7)) {
	275	/* More facility bits available with stfle */
	276	register unsigned long reg0 asm("0") = MAX_FACILITY_BIT/64 - 1;
	277	asm volatile(".insn s,0xb2b00000,%0" /* stfle */
	278	: "=m" (S390_lowcore.stfle_fac_list), "+d" (reg0)
	279	: : "cc");
	280	nr = (reg0 + 1) * 8; /* # bytes stored by stfle */
	281	}
	282	memset((char *) S390_lowcore.stfle_fac_list + nr, 0,
	283	MAX_FACILITY_BIT/8 - nr);
	284	}
	285
53492b1d GS	286	static noinline __init void setup_hpage(void)
	287	{
	288	#ifndef CONFIG_DEBUG_PAGEALLOC
14375bc4	289	if (!test_facility(2) \|\| !test_facility(8))
53492b1d	290	return;
d3135e0c	291	S390_lowcore.machine_flags \|= MACHINE_FLAG_HPAGE;
53492b1d GS	292	__ctl_set_bit(0, 23);
	293	#endif
	294	}
	295
2e5061e4 HC	296	static __init void detect_mvpg(void)
	297	{
	298	#ifndef CONFIG_64BIT
	299	int rc;
	300
	301	asm volatile(
	302	" la 0,0\n"
	303	" mvpg %2,%2\n"
	304	"0: la %0,0\n"
	305	"1:\n"
	306	EX_TABLE(0b,1b)
	307	: "=d" (rc) : "0" (-EOPNOTSUPP), "a" (0) : "memory", "cc", "0");
	308	if (!rc)
d3135e0c	309	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVPG;
2e5061e4 HC	310	#endif
	311	}
	312
	313	static __init void detect_ieee(void)
	314	{
	315	#ifndef CONFIG_64BIT
	316	int rc, tmp;
	317
	318	asm volatile(
	319	" efpc %1,0\n"
	320	"0: la %0,0\n"
	321	"1:\n"
	322	EX_TABLE(0b,1b)
	323	: "=d" (rc), "=d" (tmp): "0" (-EOPNOTSUPP) : "cc");
	324	if (!rc)
d3135e0c	325	S390_lowcore.machine_flags \|= MACHINE_FLAG_IEEE;
2e5061e4 HC	326	#endif
	327	}
	328
	329	static __init void detect_csp(void)
	330	{
	331	#ifndef CONFIG_64BIT
	332	int rc;
	333
	334	asm volatile(
	335	" la 0,0\n"
	336	" la 1,0\n"
	337	" la 2,4\n"
	338	" csp 0,2\n"
	339	"0: la %0,0\n"
	340	"1:\n"
	341	EX_TABLE(0b,1b)
	342	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc", "0", "1", "2");
	343	if (!rc)
d3135e0c	344	S390_lowcore.machine_flags \|= MACHINE_FLAG_CSP;
2e5061e4 HC	345	#endif
	346	}
	347
	348	static __init void detect_diag9c(void)
	349	{
	350	unsigned int cpu_address;
	351	int rc;
	352
	353	cpu_address = stap();
	354	asm volatile(
	355	" diag %2,0,0x9c\n"
	356	"0: la %0,0\n"
	357	"1:\n"
	358	EX_TABLE(0b,1b)
	359	: "=d" (rc) : "0" (-EOPNOTSUPP), "d" (cpu_address) : "cc");
	360	if (!rc)
d3135e0c	361	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG9C;
2e5061e4 HC	362	}
	363
	364	static __init void detect_diag44(void)
	365	{
	366	#ifdef CONFIG_64BIT
	367	int rc;
	368
	369	asm volatile(
	370	" diag 0,0,0x44\n"
	371	"0: la %0,0\n"
	372	"1:\n"
	373	EX_TABLE(0b,1b)
	374	: "=d" (rc) : "0" (-EOPNOTSUPP) : "cc");
	375	if (!rc)
d3135e0c	376	S390_lowcore.machine_flags \|= MACHINE_FLAG_DIAG44;
2e5061e4 HC	377	#endif
	378	}
	379
	380	static __init void detect_machine_facilities(void)
	381	{
	382	#ifdef CONFIG_64BIT
14375bc4	383	if (test_facility(3))
d3135e0c	384	S390_lowcore.machine_flags \|= MACHINE_FLAG_IDTE;
14375bc4	385	if (test_facility(8))
d3135e0c	386	S390_lowcore.machine_flags \|= MACHINE_FLAG_PFMF;
9186d7a9 HC	387	if (test_facility(11))
9186d7a9 HC	388	S390_lowcore.machine_flags \|= MACHINE_FLAG_TOPOLOGY;
14375bc4	389	if (test_facility(27))
d3135e0c	390	S390_lowcore.machine_flags \|= MACHINE_FLAG_MVCOS;
14375bc4	391	if (test_facility(40))
cd3b70f5	392	S390_lowcore.machine_flags \|= MACHINE_FLAG_SPP;
2e5061e4 HC	393	#endif
	394	}
	395
761cdf6a HC	396	static __init void rescue_initrd(void)
	397	{
	398	#ifdef CONFIG_BLK_DEV_INITRD
	399	/*
	400	* Move the initrd right behind the bss section in case it starts
	401	* within the bss section. So we don't overwrite it when the bss
	402	* section gets cleared.
	403	*/
	404	if (!INITRD_START \|\| !INITRD_SIZE)
	405	return;
	406	if (INITRD_START >= (unsigned long) __bss_stop)
	407	return;
	408	memmove(__bss_stop, (void *) INITRD_START, INITRD_SIZE);
	409	INITRD_START = (unsigned long) __bss_stop;
	410	#endif
	411	}
	412
a0443fbb	413	/* Set up boot command line */
684d2fd4	414	static void __init append_to_cmdline(size_t (ipl_data)(char , size_t))
a0443fbb	415	{
684d2fd4 HB	416	char parm, delim;
	417	size_t rc, len;
	418
	419	len = strlen(boot_command_line);
a0443fbb	420
684d2fd4 HB	421	delim = boot_command_line + len; /* '\0' character position */
	422	parm = boot_command_line + len + 1; /* append right after '\0' */
	423
	424	rc = ipl_data(parm, COMMAND_LINE_SIZE - len - 1);
	425	if (rc) {
	426	if (*parm == '=')
	427	memmove(boot_command_line, parm + 1, rc);
	428	else
	429	delim = ' '; / replace '\0' with space */
	430	}
	431	}
	432
	433	static void __init setup_boot_command_line(void)
	434	{
61fd330d MS	435	int i;
	436
	437	/* convert arch command line to ascii */
	438	for (i = 0; i < ARCH_COMMAND_LINE_SIZE; i++)
	439	if (COMMAND_LINE[i] & 0x80)
	440	break;
	441	if (i < ARCH_COMMAND_LINE_SIZE)
	442	EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
	443	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE-1] = 0;
	444
a0443fbb	445	/* copy arch command line */
61fd330d MS	446	strlcpy(boot_command_line, strstrip(COMMAND_LINE),
61fd330d MS	447	ARCH_COMMAND_LINE_SIZE);
a0443fbb HB	448
a0443fbb HB	449	/* append IPL PARM data to the boot command line */
684d2fd4 HB	450	if (MACHINE_IS_VM)
	451	append_to_cmdline(append_ipl_vmparm);
	452
	453	append_to_cmdline(append_ipl_scpdata);
a0443fbb HB	454	}
	455
	456
ab14de6c HC	457	/*
	458	* Save ipl parameters, clear bss memory, initialize storage keys
	459	* and create a kernel NSS at startup if the SAVESYS= parm is defined
	460	*/
	461	void __init startup_init(void)
	462	{
b6112ccb	463	reset_tod_clock();
ab14de6c	464	ipl_save_parameters();
761cdf6a	465	rescue_initrd();
ab14de6c HC	466	clear_bss_section();
	467	init_kernel_storage_key();
	468	lockdep_init();
	469	lockdep_off();
ab14de6c HC	470	sort_main_extable();
ab14de6c HC	471	setup_lowcore_early();
14375bc4	472	setup_facility_list();
a0443fbb HB	473	detect_machine_type();
	474	ipl_update_parameters();
	475	setup_boot_command_line();
	476	create_kernel_nss();
2e5061e4 HC	477	detect_mvpg();
	478	detect_ieee();
	479	detect_csp();
	480	detect_diag9c();
	481	detect_diag44();
	482	detect_machine_facilities();
53492b1d	483	setup_hpage();
83119ad4	484	sclp_facilities_detect();
23d17421	485	detect_memory_layout(memory_chunk);
dfd9f7ab HC	486	#ifdef CONFIG_DYNAMIC_FTRACE
	487	S390_lowcore.ftrace_func = (unsigned long)ftrace_caller;
	488	#endif
ab14de6c HC	489	lockdep_on();
ab14de6c HC	490	}