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 <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/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/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);

unsigned long elf_hwcap __read_mostly = 0;
char elf_platform[ELF_PLATFORM_SIZE];

unsigned long int_hwcap = 0;

/*
 * 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 .dma section.
 */
unsigned long __dma_ref __sdma = __pa(&_sdma);
unsigned long __dma_ref __edma = __pa(&_edma);
unsigned long __dma_ref __stext_dma = __pa(&_stext_dma);
unsigned long __dma_ref __etext_dma = __pa(&_etext_dma);
struct exception_table_entry __dma_ref *__start_dma_ex_table = _start_dma_ex_table;
struct exception_table_entry __dma_ref *__stop_dma_ex_table = _stop_dma_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 DMA
 * sections.
 * Because the DMA 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 DMA
 * relocation. We must access the relevant DMA tables indirectly via
 * pointers placed in the .dma.refs linker section. Those pointers get
 * updated automatically during DMA relocation and always contain a valid
 * address within DMA sections.
 */

static __dma_data u32 __ctl_duct_dma[16] __aligned(64);

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

static __dma_data u32 __ctl_duald_dma[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,