Release 4.18 arch/s390/kernel/early.c

Directory: arch/s390/kernel
// SPDX-License-Identifier: GPL-2.0
/*
 *    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/lockdep.h>
#include <linux/extable.h>
#include <linux/pfn.h>
#include <linux/uaccess.h>
#include <linux/kernel.h>
#include <asm/diag.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 <asm/facility.h>
#include "entry.h"

static void __init setup_boot_command_line(void);

/*
 * Initialize storage key for kernel pages
 */


static noinline __init void init_kernel_storage_key(void)
{
#if PAGE_DEFAULT_KEY
	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);
#endif
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 48 87.27% 1 33.33%
Martin Schwidefsky 7 12.73% 2 66.67%
Total 55 100.00% 3 100.00%

static __initdata char sysinfo_page[PAGE_SIZE] __aligned(PAGE_SIZE);



static noinline __init void detect_machine_type(void)
{
	struct sysinfo_3_2_2 *vmms = (struct sysinfo_3_2_2 *)&sysinfo_page;

	/* Check current-configuration-level */
	if (stsi(NULL, 0, 0, 0) <= 2) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_LPAR;
		return;
	}
	/* Get virtual-machine cpu information. */
	if (stsi(vmms, 3, 2, 2) || !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;
}

Contributors
Person Tokens Prop Commits CommitProp
Christian Bornträger 31 30.69% 1 11.11%
Heiko Carstens 31 30.69% 4 44.44%
Martin Schwidefsky 27 26.73% 1 11.11%
Carsten Otte 6 5.94% 1 11.11%
Hendrik Brueckner 4 3.96% 1 11.11%
Michael Holzheu 2 1.98% 1 11.11%
Total 101 100.00% 9 100.00%

/* Remove leading, trailing and double whitespace. */


static inline void strim_all(char *str)
{
	char *s;

	s = strim(str);
	if (s != str)
		memmove(str, s, strlen(s));
	while (*str) {
		if (!isspace(*str++))
			continue;
		if (isspace(*str)) {
			s = skip_spaces(str);
			memmove(str, s, strlen(s) + 1);
		}
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 89 100.00% 1 100.00%
Total 89 100.00% 1 100.00%



static noinline __init void setup_arch_string(void)
{
	struct sysinfo_1_1_1 *mach = (struct sysinfo_1_1_1 *)&sysinfo_page;
	struct sysinfo_3_2_2 *vm = (struct sysinfo_3_2_2 *)&sysinfo_page;
	char mstr[80], hvstr[17];

	if (stsi(mach, 1, 1, 1))
		return;
	EBCASC(mach->manufacturer, sizeof(mach->manufacturer));
	EBCASC(mach->type, sizeof(mach->type));
	EBCASC(mach->model, sizeof(mach->model));
	EBCASC(mach->model_capacity, sizeof(mach->model_capacity));
	sprintf(mstr, "%-16.16s %-4.4s %-16.16s %-16.16s",
		mach->manufacturer, mach->type,
		mach->model, mach->model_capacity);
	strim_all(mstr);
	if (stsi(vm, 3, 2, 2) == 0 && vm->count) {
		EBCASC(vm->vm[0].cpi, sizeof(vm->vm[0].cpi));
		sprintf(hvstr, "%-16.16s", vm->vm[0].cpi);
		strim_all(hvstr);
	} else {
		sprintf(hvstr, "%s",
			MACHINE_IS_LPAR ? "LPAR" :
			MACHINE_IS_VM ? "z/VM" :
			MACHINE_IS_KVM ? "KVM" : "unknown");
	}
	dump_stack_set_arch_desc("%s (%s)", mstr, hvstr);
}

Contributors
Person Tokens Prop Commits CommitProp
Christian Bornträger 126 51.64% 1 33.33%
Heiko Carstens 118 48.36% 2 66.67%
Total 244 100.00% 3 100.00%



static __init void setup_topology(void)
{
	int max_mnest;

	if (!test_facility(11))
		return;
	S390_lowcore.machine_flags |= MACHINE_FLAG_TOPOLOGY;
	for (max_mnest = 6; max_mnest > 1; max_mnest--) {
		if (stsi(&sysinfo_page, 15, 1, max_mnest) == 0)
			break;
	}
	topology_max_mnest = max_mnest;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 63 100.00% 2 100.00%
Total 63 100.00% 2 100.00%



static void early_pgm_check_handler(void)
{
	const struct exception_table_entry *fixup;
	unsigned long cr0, cr0_new;
	unsigned long addr;

	addr = S390_lowcore.program_old_psw.addr;
	fixup = search_exception_tables(addr);
	if (!fixup)
		disabled_wait(0);
	/* Disable low address protection before storing into lowcore. */
	__ctl_store(cr0, 0, 0);
	cr0_new = cr0 & ~(1UL << 28);
	__ctl_load(cr0_new, 0, 0);
	S390_lowcore.program_old_psw.addr = extable_fixup(fixup);
	__ctl_load(cr0, 0, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 54 54.55% 2 66.67%
Philipp Hachtmann 45 45.45% 1 33.33%
Total 99 100.00% 3 100.00%



static noinline __init void setup_lowcore_early(void)
{
	psw_t psw;

	psw.mask = PSW_MASK_BASE | PSW_DEFAULT_KEY | PSW_MASK_EA | PSW_MASK_BA;
	psw.addr = (unsigned long) s390_base_ext_handler;
	S390_lowcore.external_new_psw = psw;
	psw.addr = (unsigned long) s390_base_pgm_handler;
	S390_lowcore.program_new_psw = psw;
	s390_base_pgm_handler_fn = early_pgm_check_handler;
	S390_lowcore.preempt_count = INIT_PREEMPT_COUNT;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 56 83.58% 2 50.00%
Martin Schwidefsky 11 16.42% 2 50.00%
Total 67 100.00% 4 100.00%



static noinline __init void setup_facility_list(void)
{
	stfle(S390_lowcore.stfle_fac_list,
	      ARRAY_SIZE(S390_lowcore.stfle_fac_list));
	memcpy(S390_lowcore.alt_stfle_fac_list,
	       S390_lowcore.stfle_fac_list,
	       sizeof(S390_lowcore.alt_stfle_fac_list));
	if (!IS_ENABLED(CONFIG_KERNEL_NOBP))
		__clear_facility(82, S390_lowcore.alt_stfle_fac_list);
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 56 94.92% 3 75.00%
Michael Holzheu 3 5.08% 1 25.00%
Total 59 100.00% 4 100.00%



static __init void detect_diag9c(void)
{
	unsigned int cpu_address;
	int rc;

	cpu_address = stap();
	diag_stat_inc(DIAG_STAT_X09C);
	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;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 35 87.50% 2 66.67%
Martin Schwidefsky 5 12.50% 1 33.33%
Total 40 100.00% 3 100.00%



static __init void detect_diag44(void)
{
	int rc;

	diag_stat_inc(DIAG_STAT_X044);
	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;
}

Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 26 83.87% 2 66.67%
Martin Schwidefsky 5 16.13% 1 33.33%
Total 31 100.00% 3 100.00%



static __init void detect_machine_facilities(void)
{
	if (test_facility(8)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT1;
		__ctl_set_bit(0, 23);
	}
	if (test_facility(78))
		S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
	if (test_facility(3))
		S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
	if (test_facility(50) && test_facility(73)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
		__ctl_set_bit(0, 55);
	}
	if (test_facility(51))
		S390_lowcore.machine_flags |= MACHINE_FLAG_TLB_LC;
	if (test_facility(129)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_VX;
		__ctl_set_bit(0, 17);
	}
	if (test_facility(130)) {
		S390_lowcore.machine_flags |= MACHINE_FLAG_NX;
		__ctl_set_bit(0, 20);
	}
	if (test_facility(133))
		S390_lowcore.machine_flags |= MACHINE_FLAG_GS;
	if (test_facility(139) && (tod_clock_base[1] & 0x80)) {
		/* Enabled signed clock comparator comparisons */
		S390_lowcore.machine_flags |= MACHINE_FLAG_SCC;
		clock_comparator_max = -1ULL >> 1;
		__ctl_set_bit(0, 53);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 118 61.14% 7 46.67%
Heiko Carstens 56 29.02% 5 33.33%
Gerald Schaefer 10 5.18% 2 13.33%
Hendrik Brueckner 9 4.66% 1 6.67%
Total 193 100.00% 15 100.00%



static inline void save_vector_registers(void)
{
#ifdef CONFIG_CRASH_DUMP
	if (test_facility(129))
		save_vx_regs(boot_cpu_vector_save_area);
#endif
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%



static int __init disable_vector_extension(char *str)
{
	S390_lowcore.machine_flags &= ~MACHINE_FLAG_VX;
	__ctl_clear_bit(0, 17);
	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Hendrik Brueckner 27 96.43% 1 50.00%
Heiko Carstens 1 3.57% 1 50.00%
Total 28 100.00% 2 100.00%

early_param("novx", disable_vector_extension);



static int __init noexec_setup(char *str)
{
	bool enabled;
	int rc;

	rc = kstrtobool(str, &enabled);
	if (!rc && !enabled) {
		/* Disable no-execute support */
		S390_lowcore.machine_flags &= ~MACHINE_FLAG_NX;
		__ctl_clear_bit(0, 20);
	}
	return rc;
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 55 100.00% 1 100.00%
Total 55 100.00% 1 100.00%

early_param("noexec", noexec_setup);



static int __init cad_setup(char *str)
{
	bool enabled;
	int rc;

	rc = kstrtobool(str, &enabled);
	if (!rc && enabled && test_facility(128))
		/* Enable problem state CAD. */
		__ctl_set_bit(2, 3);
	return rc;
}
Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 50 100.00% 3 100.00%
Total 50 100.00% 3 100.00%

early_param("cad", cad_setup);

/* 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 */
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Hendrik Brueckner 98 100.00% 2 100.00%
Total 98 100.00% 2 100.00%



static inline int has_ebcdic_char(const char *str)
{
	int i;

	for (i = 0; str[i]; i++)
		if (str[i] & 0x80)
			return 1;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Martin Schwidefsky 22 50.00% 1 33.33%
Michael Holzheu 18 40.91% 1 33.33%
Hendrik Brueckner 4 9.09% 1 33.33%
Total 44 100.00% 3 100.00%



static void __init setup_boot_command_line(void)
{
	COMMAND_LINE[ARCH_COMMAND_LINE_SIZE - 1] = 0;
	/* convert arch command line to ascii if necessary */
	if (has_ebcdic_char(COMMAND_LINE))
		EBCASC(COMMAND_LINE, ARCH_COMMAND_LINE_SIZE);
	/* 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);
}

Contributors
Person Tokens Prop Commits CommitProp
Hendrik Brueckner 26 42.62% 2 50.00%
Michael Holzheu 22 36.07% 1 25.00%
Martin Schwidefsky 13 21.31% 1 25.00%
Total 61 100.00% 4 100.00%



void __init startup_init(void)
{
	time_early_init();
	init_kernel_storage_key();
	lockdep_off();
	setup_lowcore_early();
	setup_facility_list();
	detect_machine_type();
	setup_arch_string();
	ipl_store_parameters();
	setup_boot_command_line();
	detect_diag9c();
	detect_diag44();
	detect_machine_facilities();
	save_vector_registers();
	setup_topology();
	sclp_early_detect();
	lockdep_on();
}
Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 36 64.29% 3 25.00%
Martin Schwidefsky 9 16.07% 4 33.33%
Hendrik Brueckner 4 7.14% 1 8.33%
Michael Holzheu 3 5.36% 2 16.67%
Christian Bornträger 3 5.36% 1 8.33%
Vasily Gorbik 1 1.79% 1 8.33%
Total 56 100.00% 12 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
Heiko Carstens 668 42.23% 15 25.86%
Martin Schwidefsky 421 26.61% 22 37.93%
Hendrik Brueckner 205 12.96% 5 8.62%
Christian Bornträger 170 10.75% 2 3.45%
Michael Holzheu 53 3.35% 6 10.34%
Philipp Hachtmann 45 2.84% 1 1.72%
Gerald Schaefer 10 0.63% 2 3.45%
Carsten Otte 6 0.38% 1 1.72%
Vasily Gorbik 1 0.06% 1 1.72%
Greg Kroah-Hartman 1 0.06% 1 1.72%
Paul Gortmaker 1 0.06% 1 1.72%
David Howells 1 0.06% 1 1.72%
Total 1582 100.00% 58 100.00%
Directory: arch/s390/kernel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Heiko Carstens	48	87.27%	1	33.33%
Martin Schwidefsky	7	12.73%	2	66.67%
Total	55	100.00%	3	100.00%
cregit-Linux how code gets into the kernel

Release 4.18 arch/s390/kernel/early.c

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Contributors

Overall Contributors
