path: root/arch/s390/kernel/setup.c

// SPDX-License-Identifier: GPL-2.0
/*
 *  S390 version
 *    Copyright IBM Corp. 1999, 2012
 *    Author(s): Hartmut Penner (hp@de.ibm.com),
 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
 *
 *  Derived from "arch/i386/kernel/setup.c"
 *    Copyright (C) 1995, Linus Torvalds
 */

/*
 * This file handles the architecture-dependent parts of initialization
 */

#define KMSG_COMPONENT "setup"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/errno.h>
#include <linux/export.h>
#include <linux/sched.h>
#include <linux/sched/task.h>
#include <linux/cpu.h>
#include <linux/kernel.h>
#include <linux/memblock.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/random.h>
#include <linux/user.h>
#include <linux/tty.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/initrd.h>
#include <linux/root_dev.h>
#include <linux/console.h>
#include <linux/kernel_stat.h>
#include <linux/dma-map-ops.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <linux/pfn.h>
#include <linux/ctype.h>
#include <linux/reboot.h>
#include <linux/topology.h>
#include <linux/kexec.h>
#include <linux/crash_dump.h>
#include <linux/memory.h>
#include <linux/compat.h>
#include <linux/start_kernel.h>
#include <linux/hugetlb.h>
#include <linux/kmemleak.h>

#include <asm/boot_data.h>
#include <asm/ipl.h>
#include <asm/facility.h>
#include <asm/smp.h>
#include <asm/mmu_context.h>
#include <asm/cpcmd.h>
#include <asm/abs_lowcore.h>
#include <asm/nmi.h>
#include <asm/irq.h>
#include <asm/page.h>
#include <asm/ptrace.h>
#include <asm/sections.h>
#include <asm/ebcdic.h>
#include <asm/diag.h>
#include <asm/os_info.h>
#include <asm/sclp.h>
#include <asm/stacktrace.h>
#include <asm/sysinfo.h>
#include <asm/numa.h>
#include <asm/alternative.h>
#include <asm/nospec-branch.h>
#include <asm/mem_detect.h>
#include <asm/maccess.h>
#include <asm/uv.h>
#include <asm/asm-offsets.h>
#include "entry.h"

/*
 * Machine setup..
 */
unsigned int console_mode = 0;
EXPORT_SYMBOL(console_mode);

unsigned int console_devno = -1;
EXPORT_SYMBOL(console_devno);

unsigned int console_irq = -1;
EXPORT_SYMBOL(console_irq);

/*
 * Some code and data needs to stay below 2 GB, even when the kernel would be
 * relocated above 2 GB, because it has to use 31 bit addresses.
 * Such code and data is part of the .amode31 section.
 */
unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31;
unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31;
unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31;
unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31;
struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;

/*
 * Control registers CR2, CR5 and CR15 are initialized with addresses
 * of tables that must be placed below 2G which is handled by the AMODE31
 * sections.
 * Because the AMODE31 sections are relocated below 2G at startup,
 * the content of control registers CR2, CR5 and CR15 must be updated
 * with new addresses after the relocation. The initial initialization of
 * control registers occurs in head64.S and then gets updated again after AMODE31
 * relocation. We must access the relevant AMODE31 tables indirectly via
 * pointers placed in the .amode31.refs linker section. Those pointers get
 * updated automatically during AMODE31 relocation and always contain a valid
 * address within AMODE31 sections.
 */

static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);

static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
	[1] = 0xffffffffffffffff
};

static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0,
	0x80000000, 0, 0, 0
};

static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
	0, 0, 0x89000000, 0,
	0, 0, 0x8a000000, 0
};

static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;

int __bootdata(noexec_disabled);
unsigned long __bootdata(ident_map_size);
struct mem_detect_info __bootdata(mem_detect);
struct initrd_data __bootdata(initrd_data);

unsigned long __bootdata_preserved(__kaslr_offset);
unsigned long __bootdata(__amode31_base);
unsigned int __bootdata_preserved(zlib_dfltcc_support);
EXPORT_SYMBOL(zlib_dfltcc_support);
u64 __bootdata_preserved(stfle_fac_list[16]);
EXPORT_SYMBOL(stfle_fac_list);
u64 __bootdata_preserved(alt_stfle_fac_list[16]);
struct oldmem_data __bootdata_preserved(oldmem_data);

unsigned long VMALLOC_START;
EXPORT_SYMBOL(VMALLOC_START);

unsigned long VMALLOC_END;
EXPORT_SYMBOL(VMALLOC_END);

struct page *vmemmap;
EXPORT_SYMBOL(vmemmap);
unsigned long vmemmap_size;

unsigned long MODULES_VADDR;
unsigned long MODULES_END;

/* An array with a pointer to the lowcore of every CPU. */
struct lowcore *lowcore_ptr[NR_CPUS];
EXPORT_SYMBOL(lowcore_ptr);

DEFINE_STATIC_KEY_FALSE(cpu_has_bear);