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![Alexander Gordeev](/assets/img/avatar_default.png)
SPX instruction called from set_prefix() expects physical address of the lowcore to be installed, but instead the virtual address is passed. Note: this does not fix a bug currently, since virtual and physical addresses are identical. Reviewed-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
1061 lines
29 KiB
C
1061 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* S390 version
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* Copyright IBM Corp. 1999, 2012
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* Author(s): Hartmut Penner (hp@de.ibm.com),
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*
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* Derived from "arch/i386/kernel/setup.c"
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* Copyright (C) 1995, Linus Torvalds
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*/
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/*
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* This file handles the architecture-dependent parts of initialization
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*/
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#define KMSG_COMPONENT "setup"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/sched.h>
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#include <linux/sched/task.h>
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#include <linux/cpu.h>
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#include <linux/kernel.h>
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#include <linux/memblock.h>
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#include <linux/mm.h>
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#include <linux/stddef.h>
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#include <linux/unistd.h>
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#include <linux/ptrace.h>
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#include <linux/random.h>
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#include <linux/user.h>
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#include <linux/tty.h>
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#include <linux/ioport.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/initrd.h>
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#include <linux/root_dev.h>
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#include <linux/console.h>
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#include <linux/kernel_stat.h>
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#include <linux/dma-map-ops.h>
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#include <linux/device.h>
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#include <linux/notifier.h>
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#include <linux/pfn.h>
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#include <linux/ctype.h>
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#include <linux/reboot.h>
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#include <linux/topology.h>
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#include <linux/kexec.h>
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#include <linux/crash_dump.h>
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#include <linux/memory.h>
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#include <linux/compat.h>
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#include <linux/start_kernel.h>
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#include <linux/hugetlb.h>
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#include <linux/kmemleak.h>
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#include <asm/boot_data.h>
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#include <asm/ipl.h>
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#include <asm/facility.h>
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#include <asm/smp.h>
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#include <asm/mmu_context.h>
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#include <asm/cpcmd.h>
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#include <asm/lowcore.h>
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#include <asm/nmi.h>
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#include <asm/irq.h>
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#include <asm/page.h>
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#include <asm/ptrace.h>
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#include <asm/sections.h>
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#include <asm/ebcdic.h>
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#include <asm/diag.h>
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#include <asm/os_info.h>
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#include <asm/sclp.h>
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#include <asm/stacktrace.h>
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#include <asm/sysinfo.h>
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#include <asm/numa.h>
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#include <asm/alternative.h>
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#include <asm/nospec-branch.h>
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#include <asm/mem_detect.h>
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#include <asm/uv.h>
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#include <asm/asm-offsets.h>
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#include "entry.h"
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/*
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* Machine setup..
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*/
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unsigned int console_mode = 0;
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EXPORT_SYMBOL(console_mode);
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unsigned int console_devno = -1;
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EXPORT_SYMBOL(console_devno);
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unsigned int console_irq = -1;
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EXPORT_SYMBOL(console_irq);
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/*
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* Some code and data needs to stay below 2 GB, even when the kernel would be
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* relocated above 2 GB, because it has to use 31 bit addresses.
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* Such code and data is part of the .amode31 section.
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*/
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unsigned long __amode31_ref __samode31 = (unsigned long)&_samode31;
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unsigned long __amode31_ref __eamode31 = (unsigned long)&_eamode31;
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unsigned long __amode31_ref __stext_amode31 = (unsigned long)&_stext_amode31;
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unsigned long __amode31_ref __etext_amode31 = (unsigned long)&_etext_amode31;
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struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
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struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
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/*
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* Control registers CR2, CR5 and CR15 are initialized with addresses
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* of tables that must be placed below 2G which is handled by the AMODE31
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* sections.
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* Because the AMODE31 sections are relocated below 2G at startup,
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* the content of control registers CR2, CR5 and CR15 must be updated
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* with new addresses after the relocation. The initial initialization of
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* control registers occurs in head64.S and then gets updated again after AMODE31
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* relocation. We must access the relevant AMODE31 tables indirectly via
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* pointers placed in the .amode31.refs linker section. Those pointers get
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* updated automatically during AMODE31 relocation and always contain a valid
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* address within AMODE31 sections.
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*/
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static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
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static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
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[1] = 0xffffffffffffffff
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};
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static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
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0x80000000, 0, 0, 0,
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0x80000000, 0, 0, 0,
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0x80000000, 0, 0, 0,
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0x80000000, 0, 0, 0,
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0x80000000, 0, 0, 0,
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0x80000000, 0, 0, 0,
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0x80000000, 0, 0, 0,
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0x80000000, 0, 0, 0
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};
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static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
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0, 0, 0x89000000, 0,
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0, 0, 0x8a000000, 0
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};
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static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
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static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
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static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
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static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
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int __bootdata(noexec_disabled);
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unsigned long __bootdata(ident_map_size);
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struct mem_detect_info __bootdata(mem_detect);
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struct initrd_data __bootdata(initrd_data);
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unsigned long __bootdata_preserved(__kaslr_offset);
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unsigned long __bootdata(__amode31_base);
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unsigned int __bootdata_preserved(zlib_dfltcc_support);
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EXPORT_SYMBOL(zlib_dfltcc_support);
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u64 __bootdata_preserved(stfle_fac_list[16]);
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EXPORT_SYMBOL(stfle_fac_list);
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u64 __bootdata_preserved(alt_stfle_fac_list[16]);
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struct oldmem_data __bootdata_preserved(oldmem_data);
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unsigned long VMALLOC_START;
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EXPORT_SYMBOL(VMALLOC_START);
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unsigned long VMALLOC_END;
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EXPORT_SYMBOL(VMALLOC_END);
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struct page *vmemmap;
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EXPORT_SYMBOL(vmemmap);
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unsigned long vmemmap_size;
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unsigned long MODULES_VADDR;
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unsigned long MODULES_END;
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/* An array with a pointer to the lowcore of every CPU. */
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struct lowcore *lowcore_ptr[NR_CPUS];
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EXPORT_SYMBOL(lowcore_ptr);
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DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
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/*
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* The Write Back bit position in the physaddr is given by the SLPC PCI.
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* Leaving the mask zero always uses write through which is safe
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*/
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unsigned long mio_wb_bit_mask __ro_after_init;
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/*
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* This is set up by the setup-routine at boot-time
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* for S390 need to find out, what we have to setup
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* using address 0x10400 ...
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*/
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#include <asm/setup.h>
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/*
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* condev= and conmode= setup parameter.
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*/
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static int __init condev_setup(char *str)
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{
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int vdev;
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vdev = simple_strtoul(str, &str, 0);
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if (vdev >= 0 && vdev < 65536) {
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console_devno = vdev;
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console_irq = -1;
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}
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return 1;
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}
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__setup("condev=", condev_setup);
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static void __init set_preferred_console(void)
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{
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if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
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add_preferred_console("ttyS", 0, NULL);
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else if (CONSOLE_IS_3270)
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add_preferred_console("tty3270", 0, NULL);
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else if (CONSOLE_IS_VT220)
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add_preferred_console("ttysclp", 0, NULL);
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else if (CONSOLE_IS_HVC)
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add_preferred_console("hvc", 0, NULL);
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}
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static int __init conmode_setup(char *str)
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{
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
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SET_CONSOLE_SCLP;
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#endif
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#if defined(CONFIG_TN3215_CONSOLE)
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if (!strcmp(str, "3215"))
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SET_CONSOLE_3215;
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#endif
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#if defined(CONFIG_TN3270_CONSOLE)
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if (!strcmp(str, "3270"))
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SET_CONSOLE_3270;
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#endif
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set_preferred_console();
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return 1;
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}
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__setup("conmode=", conmode_setup);
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static void __init conmode_default(void)
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{
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char query_buffer[1024];
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char *ptr;
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if (MACHINE_IS_VM) {
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cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
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console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
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ptr = strstr(query_buffer, "SUBCHANNEL =");
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console_irq = simple_strtoul(ptr + 13, NULL, 16);
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cpcmd("QUERY TERM", query_buffer, 1024, NULL);
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ptr = strstr(query_buffer, "CONMODE");
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/*
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* Set the conmode to 3215 so that the device recognition
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* will set the cu_type of the console to 3215. If the
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* conmode is 3270 and we don't set it back then both
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* 3215 and the 3270 driver will try to access the console
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* device (3215 as console and 3270 as normal tty).
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*/
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cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
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if (ptr == NULL) {
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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return;
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}
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if (str_has_prefix(ptr + 8, "3270")) {
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#if defined(CONFIG_TN3270_CONSOLE)
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SET_CONSOLE_3270;
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#elif defined(CONFIG_TN3215_CONSOLE)
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SET_CONSOLE_3215;
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#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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} else if (str_has_prefix(ptr + 8, "3215")) {
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#if defined(CONFIG_TN3215_CONSOLE)
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SET_CONSOLE_3215;
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#elif defined(CONFIG_TN3270_CONSOLE)
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SET_CONSOLE_3270;
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#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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}
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} else if (MACHINE_IS_KVM) {
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if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
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SET_CONSOLE_VT220;
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else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
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SET_CONSOLE_SCLP;
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else
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SET_CONSOLE_HVC;
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} else {
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
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SET_CONSOLE_SCLP;
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#endif
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}
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}
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#ifdef CONFIG_CRASH_DUMP
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static void __init setup_zfcpdump(void)
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{
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if (!is_ipl_type_dump())
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return;
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if (oldmem_data.start)
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return;
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strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
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console_loglevel = 2;
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}
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#else
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static inline void setup_zfcpdump(void) {}
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#endif /* CONFIG_CRASH_DUMP */
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/*
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* Reboot, halt and power_off stubs. They just call _machine_restart,
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* _machine_halt or _machine_power_off.
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*/
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void machine_restart(char *command)
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{
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if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
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/*
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* Only unblank the console if we are called in enabled
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* context or a bust_spinlocks cleared the way for us.
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*/
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console_unblank();
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_machine_restart(command);
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}
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void machine_halt(void)
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{
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if (!in_interrupt() || oops_in_progress)
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/*
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* Only unblank the console if we are called in enabled
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* context or a bust_spinlocks cleared the way for us.
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*/
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console_unblank();
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_machine_halt();
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}
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void machine_power_off(void)
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{
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if (!in_interrupt() || oops_in_progress)
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/*
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* Only unblank the console if we are called in enabled
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* context or a bust_spinlocks cleared the way for us.
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*/
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console_unblank();
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_machine_power_off();
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}
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/*
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* Dummy power off function.
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*/
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL_GPL(pm_power_off);
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void *restart_stack;
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unsigned long stack_alloc(void)
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{
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#ifdef CONFIG_VMAP_STACK
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void *ret;
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ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
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NUMA_NO_NODE, __builtin_return_address(0));
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kmemleak_not_leak(ret);
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return (unsigned long)ret;
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#else
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return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
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#endif
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}
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void stack_free(unsigned long stack)
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{
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#ifdef CONFIG_VMAP_STACK
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vfree((void *) stack);
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#else
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free_pages(stack, THREAD_SIZE_ORDER);
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#endif
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}
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int __init arch_early_irq_init(void)
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{
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unsigned long stack;
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stack = __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
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if (!stack)
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panic("Couldn't allocate async stack");
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S390_lowcore.async_stack = stack + STACK_INIT_OFFSET;
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return 0;
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}
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void __init arch_call_rest_init(void)
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{
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unsigned long stack;
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stack = stack_alloc();
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if (!stack)
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panic("Couldn't allocate kernel stack");
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current->stack = (void *) stack;
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#ifdef CONFIG_VMAP_STACK
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current->stack_vm_area = (void *) stack;
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#endif
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set_task_stack_end_magic(current);
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stack += STACK_INIT_OFFSET;
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S390_lowcore.kernel_stack = stack;
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call_on_stack_noreturn(rest_init, stack);
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}
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static void __init setup_lowcore_dat_off(void)
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{
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unsigned long int_psw_mask = PSW_KERNEL_BITS;
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unsigned long mcck_stack;
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struct lowcore *lc;
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if (IS_ENABLED(CONFIG_KASAN))
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int_psw_mask |= PSW_MASK_DAT;
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/*
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* Setup lowcore for boot cpu
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*/
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BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
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lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
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if (!lc)
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panic("%s: Failed to allocate %zu bytes align=%zx\n",
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__func__, sizeof(*lc), sizeof(*lc));
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lc->restart_psw.mask = PSW_KERNEL_BITS;
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lc->restart_psw.addr = (unsigned long) restart_int_handler;
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lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
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lc->external_new_psw.addr = (unsigned long) ext_int_handler;
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lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
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lc->svc_new_psw.addr = (unsigned long) system_call;
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lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
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lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
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lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
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lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
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lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK;
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lc->io_new_psw.addr = (unsigned long) io_int_handler;
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lc->clock_comparator = clock_comparator_max;
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lc->nodat_stack = ((unsigned long) &init_thread_union)
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+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
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lc->current_task = (unsigned long)&init_task;
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lc->lpp = LPP_MAGIC;
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lc->machine_flags = S390_lowcore.machine_flags;
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lc->preempt_count = S390_lowcore.preempt_count;
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nmi_alloc_mcesa_early(&lc->mcesad);
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lc->sys_enter_timer = S390_lowcore.sys_enter_timer;
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lc->exit_timer = S390_lowcore.exit_timer;
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lc->user_timer = S390_lowcore.user_timer;
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lc->system_timer = S390_lowcore.system_timer;
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lc->steal_timer = S390_lowcore.steal_timer;
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lc->last_update_timer = S390_lowcore.last_update_timer;
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lc->last_update_clock = S390_lowcore.last_update_clock;
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/*
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* Allocate the global restart stack which is the same for
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* all CPUs in cast *one* of them does a PSW restart.
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*/
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|
restart_stack = memblock_alloc(THREAD_SIZE, THREAD_SIZE);
|
|
if (!restart_stack)
|
|
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
|
|
__func__, THREAD_SIZE, THREAD_SIZE);
|
|
restart_stack += STACK_INIT_OFFSET;
|
|
|
|
/*
|
|
* Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
|
|
* restart data to the absolute zero lowcore. This is necessary if
|
|
* PSW restart is done on an offline CPU that has lowcore zero.
|
|
*/
|
|
lc->restart_stack = (unsigned long) restart_stack;
|
|
lc->restart_fn = (unsigned long) do_restart;
|
|
lc->restart_data = 0;
|
|
lc->restart_source = -1U;
|
|
|
|
mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
|
|
if (!mcck_stack)
|
|
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
|
|
__func__, THREAD_SIZE, THREAD_SIZE);
|
|
lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET;
|
|
|
|
/* Setup absolute zero lowcore */
|
|
put_abs_lowcore(restart_stack, lc->restart_stack);
|
|
put_abs_lowcore(restart_fn, lc->restart_fn);
|
|
put_abs_lowcore(restart_data, lc->restart_data);
|
|
put_abs_lowcore(restart_source, lc->restart_source);
|
|
put_abs_lowcore(restart_psw, lc->restart_psw);
|
|
|
|
lc->spinlock_lockval = arch_spin_lockval(0);
|
|
lc->spinlock_index = 0;
|
|
arch_spin_lock_setup(0);
|
|
lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
|
|
lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
|
|
lc->preempt_count = PREEMPT_DISABLED;
|
|
|
|
set_prefix(__pa(lc));
|
|
lowcore_ptr[0] = lc;
|
|
}
|
|
|
|
static void __init setup_lowcore_dat_on(void)
|
|
{
|
|
struct lowcore *lc = lowcore_ptr[0];
|
|
int cr;
|
|
|
|
__ctl_clear_bit(0, 28);
|
|
S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT;
|
|
S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT;
|
|
S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT;
|
|
S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT;
|
|
__ctl_store(S390_lowcore.cregs_save_area, 0, 15);
|
|
__ctl_set_bit(0, 28);
|
|
put_abs_lowcore(restart_flags, RESTART_FLAG_CTLREGS);
|
|
put_abs_lowcore(program_new_psw, lc->program_new_psw);
|
|
for (cr = 0; cr < ARRAY_SIZE(lc->cregs_save_area); cr++)
|
|
put_abs_lowcore(cregs_save_area[cr], lc->cregs_save_area[cr]);
|
|
}
|
|
|
|
static struct resource code_resource = {
|
|
.name = "Kernel code",
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
|
|
};
|
|
|
|
static struct resource data_resource = {
|
|
.name = "Kernel data",
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
|
|
};
|
|
|
|
static struct resource bss_resource = {
|
|
.name = "Kernel bss",
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
|
|
};
|
|
|
|
static struct resource __initdata *standard_resources[] = {
|
|
&code_resource,
|
|
&data_resource,
|
|
&bss_resource,
|
|
};
|
|
|
|
static void __init setup_resources(void)
|
|
{
|
|
struct resource *res, *std_res, *sub_res;
|
|
phys_addr_t start, end;
|
|
int j;
|
|
u64 i;
|
|
|
|
code_resource.start = (unsigned long) _text;
|
|
code_resource.end = (unsigned long) _etext - 1;
|
|
data_resource.start = (unsigned long) _etext;
|
|
data_resource.end = (unsigned long) _edata - 1;
|
|
bss_resource.start = (unsigned long) __bss_start;
|
|
bss_resource.end = (unsigned long) __bss_stop - 1;
|
|
|
|
for_each_mem_range(i, &start, &end) {
|
|
res = memblock_alloc(sizeof(*res), 8);
|
|
if (!res)
|
|
panic("%s: Failed to allocate %zu bytes align=0x%x\n",
|
|
__func__, sizeof(*res), 8);
|
|
res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
|
|
|
|
res->name = "System RAM";
|
|
res->start = start;
|
|
/*
|
|
* In memblock, end points to the first byte after the
|
|
* range while in resourses, end points to the last byte in
|
|
* the range.
|
|
*/
|
|
res->end = end - 1;
|
|
request_resource(&iomem_resource, res);
|
|
|
|
for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
|
|
std_res = standard_resources[j];
|
|
if (std_res->start < res->start ||
|
|
std_res->start > res->end)
|
|
continue;
|
|
if (std_res->end > res->end) {
|
|
sub_res = memblock_alloc(sizeof(*sub_res), 8);
|
|
if (!sub_res)
|
|
panic("%s: Failed to allocate %zu bytes align=0x%x\n",
|
|
__func__, sizeof(*sub_res), 8);
|
|
*sub_res = *std_res;
|
|
sub_res->end = res->end;
|
|
std_res->start = res->end + 1;
|
|
request_resource(res, sub_res);
|
|
} else {
|
|
request_resource(res, std_res);
|
|
}
|
|
}
|
|
}
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
/*
|
|
* Re-add removed crash kernel memory as reserved memory. This makes
|
|
* sure it will be mapped with the identity mapping and struct pages
|
|
* will be created, so it can be resized later on.
|
|
* However add it later since the crash kernel resource should not be
|
|
* part of the System RAM resource.
|
|
*/
|
|
if (crashk_res.end) {
|
|
memblock_add_node(crashk_res.start, resource_size(&crashk_res),
|
|
0, MEMBLOCK_NONE);
|
|
memblock_reserve(crashk_res.start, resource_size(&crashk_res));
|
|
insert_resource(&iomem_resource, &crashk_res);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void __init setup_memory_end(void)
|
|
{
|
|
memblock_remove(ident_map_size, PHYS_ADDR_MAX - ident_map_size);
|
|
max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
|
|
pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
|
|
}
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
|
|
/*
|
|
* When kdump is enabled, we have to ensure that no memory from the area
|
|
* [0 - crashkernel memory size] is set offline - it will be exchanged with
|
|
* the crashkernel memory region when kdump is triggered. The crashkernel
|
|
* memory region can never get offlined (pages are unmovable).
|
|
*/
|
|
static int kdump_mem_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct memory_notify *arg = data;
|
|
|
|
if (action != MEM_GOING_OFFLINE)
|
|
return NOTIFY_OK;
|
|
if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
|
|
return NOTIFY_BAD;
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block kdump_mem_nb = {
|
|
.notifier_call = kdump_mem_notifier,
|
|
};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Reserve memory for kdump kernel to be loaded with kexec
|
|
*/
|
|
static void __init reserve_crashkernel(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
unsigned long long crash_base, crash_size;
|
|
phys_addr_t low, high;
|
|
int rc;
|
|
|
|
rc = parse_crashkernel(boot_command_line, ident_map_size, &crash_size,
|
|
&crash_base);
|
|
|
|
crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
|
|
crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
|
|
if (rc || crash_size == 0)
|
|
return;
|
|
|
|
if (memblock.memory.regions[0].size < crash_size) {
|
|
pr_info("crashkernel reservation failed: %s\n",
|
|
"first memory chunk must be at least crashkernel size");
|
|
return;
|
|
}
|
|
|
|
low = crash_base ?: oldmem_data.start;
|
|
high = low + crash_size;
|
|
if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
|
|
/* The crashkernel fits into OLDMEM, reuse OLDMEM */
|
|
crash_base = low;
|
|
} else {
|
|
/* Find suitable area in free memory */
|
|
low = max_t(unsigned long, crash_size, sclp.hsa_size);
|
|
high = crash_base ? crash_base + crash_size : ULONG_MAX;
|
|
|
|
if (crash_base && crash_base < low) {
|
|
pr_info("crashkernel reservation failed: %s\n",
|
|
"crash_base too low");
|
|
return;
|
|
}
|
|
low = crash_base ?: low;
|
|
crash_base = memblock_phys_alloc_range(crash_size,
|
|
KEXEC_CRASH_MEM_ALIGN,
|
|
low, high);
|
|
}
|
|
|
|
if (!crash_base) {
|
|
pr_info("crashkernel reservation failed: %s\n",
|
|
"no suitable area found");
|
|
return;
|
|
}
|
|
|
|
if (register_memory_notifier(&kdump_mem_nb)) {
|
|
memblock_phys_free(crash_base, crash_size);
|
|
return;
|
|
}
|
|
|
|
if (!oldmem_data.start && MACHINE_IS_VM)
|
|
diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
|
|
crashk_res.start = crash_base;
|
|
crashk_res.end = crash_base + crash_size - 1;
|
|
memblock_remove(crash_base, crash_size);
|
|
pr_info("Reserving %lluMB of memory at %lluMB "
|
|
"for crashkernel (System RAM: %luMB)\n",
|
|
crash_size >> 20, crash_base >> 20,
|
|
(unsigned long)memblock.memory.total_size >> 20);
|
|
os_info_crashkernel_add(crash_base, crash_size);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Reserve the initrd from being used by memblock
|
|
*/
|
|
static void __init reserve_initrd(void)
|
|
{
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (!initrd_data.start || !initrd_data.size)
|
|
return;
|
|
initrd_start = (unsigned long)__va(initrd_data.start);
|
|
initrd_end = initrd_start + initrd_data.size;
|
|
memblock_reserve(initrd_data.start, initrd_data.size);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Reserve the memory area used to pass the certificate lists
|
|
*/
|
|
static void __init reserve_certificate_list(void)
|
|
{
|
|
if (ipl_cert_list_addr)
|
|
memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
|
|
}
|
|
|
|
static void __init reserve_mem_detect_info(void)
|
|
{
|
|
unsigned long start, size;
|
|
|
|
get_mem_detect_reserved(&start, &size);
|
|
if (size)
|
|
memblock_reserve(start, size);
|
|
}
|
|
|
|
static void __init free_mem_detect_info(void)
|
|
{
|
|
unsigned long start, size;
|
|
|
|
get_mem_detect_reserved(&start, &size);
|
|
if (size)
|
|
memblock_phys_free(start, size);
|
|
}
|
|
|
|
static const char * __init get_mem_info_source(void)
|
|
{
|
|
switch (mem_detect.info_source) {
|
|
case MEM_DETECT_SCLP_STOR_INFO:
|
|
return "sclp storage info";
|
|
case MEM_DETECT_DIAG260:
|
|
return "diag260";
|
|
case MEM_DETECT_SCLP_READ_INFO:
|
|
return "sclp read info";
|
|
case MEM_DETECT_BIN_SEARCH:
|
|
return "binary search";
|
|
}
|
|
return "none";
|
|
}
|
|
|
|
static void __init memblock_add_mem_detect_info(void)
|
|
{
|
|
unsigned long start, end;
|
|
int i;
|
|
|
|
pr_debug("physmem info source: %s (%hhd)\n",
|
|
get_mem_info_source(), mem_detect.info_source);
|
|
/* keep memblock lists close to the kernel */
|
|
memblock_set_bottom_up(true);
|
|
for_each_mem_detect_block(i, &start, &end) {
|
|
memblock_add(start, end - start);
|
|
memblock_physmem_add(start, end - start);
|
|
}
|
|
memblock_set_bottom_up(false);
|
|
memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
|
|
}
|
|
|
|
/*
|
|
* Check for initrd being in usable memory
|
|
*/
|
|
static void __init check_initrd(void)
|
|
{
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (initrd_data.start && initrd_data.size &&
|
|
!memblock_is_region_memory(initrd_data.start, initrd_data.size)) {
|
|
pr_err("The initial RAM disk does not fit into the memory\n");
|
|
memblock_phys_free(initrd_data.start, initrd_data.size);
|
|
initrd_start = initrd_end = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Reserve memory used for lowcore/command line/kernel image.
|
|
*/
|
|
static void __init reserve_kernel(void)
|
|
{
|
|
memblock_reserve(0, STARTUP_NORMAL_OFFSET);
|
|
memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
|
|
memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
|
|
memblock_reserve(__amode31_base, __eamode31 - __samode31);
|
|
memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
|
|
memblock_reserve(__pa(_stext), _end - _stext);
|
|
}
|
|
|
|
static void __init setup_memory(void)
|
|
{
|
|
phys_addr_t start, end;
|
|
u64 i;
|
|
|
|
/*
|
|
* Init storage key for present memory
|
|
*/
|
|
for_each_mem_range(i, &start, &end)
|
|
storage_key_init_range(start, end);
|
|
|
|
psw_set_key(PAGE_DEFAULT_KEY);
|
|
}
|
|
|
|
static void __init relocate_amode31_section(void)
|
|
{
|
|
unsigned long amode31_size = __eamode31 - __samode31;
|
|
long amode31_offset = __amode31_base - __samode31;
|
|
long *ptr;
|
|
|
|
pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
|
|
|
|
/* Move original AMODE31 section to the new one */
|
|
memmove((void *)__amode31_base, (void *)__samode31, amode31_size);
|
|
/* Zero out the old AMODE31 section to catch invalid accesses within it */
|
|
memset((void *)__samode31, 0, amode31_size);
|
|
|
|
/* Update all AMODE31 region references */
|
|
for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
|
|
*ptr += amode31_offset;
|
|
}
|
|
|
|
/* This must be called after AMODE31 relocation */
|
|
static void __init setup_cr(void)
|
|
{
|
|
union ctlreg2 cr2;
|
|
union ctlreg5 cr5;
|
|
union ctlreg15 cr15;
|
|
|
|
__ctl_duct[1] = (unsigned long)__ctl_aste;
|
|
__ctl_duct[2] = (unsigned long)__ctl_aste;
|
|
__ctl_duct[4] = (unsigned long)__ctl_duald;
|
|
|
|
/* Update control registers CR2, CR5 and CR15 */
|
|
__ctl_store(cr2.val, 2, 2);
|
|
__ctl_store(cr5.val, 5, 5);
|
|
__ctl_store(cr15.val, 15, 15);
|
|
cr2.ducto = (unsigned long)__ctl_duct >> 6;
|
|
cr5.pasteo = (unsigned long)__ctl_duct >> 6;
|
|
cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
|
|
__ctl_load(cr2.val, 2, 2);
|
|
__ctl_load(cr5.val, 5, 5);
|
|
__ctl_load(cr15.val, 15, 15);
|
|
}
|
|
|
|
/*
|
|
* Add system information as device randomness
|
|
*/
|
|
static void __init setup_randomness(void)
|
|
{
|
|
struct sysinfo_3_2_2 *vmms;
|
|
|
|
vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
|
if (!vmms)
|
|
panic("Failed to allocate memory for sysinfo structure\n");
|
|
if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
|
|
add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
|
|
memblock_free(vmms, PAGE_SIZE);
|
|
}
|
|
|
|
/*
|
|
* Find the correct size for the task_struct. This depends on
|
|
* the size of the struct fpu at the end of the thread_struct
|
|
* which is embedded in the task_struct.
|
|
*/
|
|
static void __init setup_task_size(void)
|
|
{
|
|
int task_size = sizeof(struct task_struct);
|
|
|
|
if (!MACHINE_HAS_VX) {
|
|
task_size -= sizeof(__vector128) * __NUM_VXRS;
|
|
task_size += sizeof(freg_t) * __NUM_FPRS;
|
|
}
|
|
arch_task_struct_size = task_size;
|
|
}
|
|
|
|
/*
|
|
* Issue diagnose 318 to set the control program name and
|
|
* version codes.
|
|
*/
|
|
static void __init setup_control_program_code(void)
|
|
{
|
|
union diag318_info diag318_info = {
|
|
.cpnc = CPNC_LINUX,
|
|
.cpvc = 0,
|
|
};
|
|
|
|
if (!sclp.has_diag318)
|
|
return;
|
|
|
|
diag_stat_inc(DIAG_STAT_X318);
|
|
asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
|
|
}
|
|
|
|
/*
|
|
* Print the component list from the IPL report
|
|
*/
|
|
static void __init log_component_list(void)
|
|
{
|
|
struct ipl_rb_component_entry *ptr, *end;
|
|
char *str;
|
|
|
|
if (!early_ipl_comp_list_addr)
|
|
return;
|
|
if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
|
|
pr_info("Linux is running with Secure-IPL enabled\n");
|
|
else
|
|
pr_info("Linux is running with Secure-IPL disabled\n");
|
|
ptr = (void *) early_ipl_comp_list_addr;
|
|
end = (void *) ptr + early_ipl_comp_list_size;
|
|
pr_info("The IPL report contains the following components:\n");
|
|
while (ptr < end) {
|
|
if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
|
|
if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
|
|
str = "signed, verified";
|
|
else
|
|
str = "signed, verification failed";
|
|
} else {
|
|
str = "not signed";
|
|
}
|
|
pr_info("%016llx - %016llx (%s)\n",
|
|
ptr->addr, ptr->addr + ptr->len, str);
|
|
ptr++;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup function called from init/main.c just after the banner
|
|
* was printed.
|
|
*/
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
/*
|
|
* print what head.S has found out about the machine
|
|
*/
|
|
if (MACHINE_IS_VM)
|
|
pr_info("Linux is running as a z/VM "
|
|
"guest operating system in 64-bit mode\n");
|
|
else if (MACHINE_IS_KVM)
|
|
pr_info("Linux is running under KVM in 64-bit mode\n");
|
|
else if (MACHINE_IS_LPAR)
|
|
pr_info("Linux is running natively in 64-bit mode\n");
|
|
else
|
|
pr_info("Linux is running as a guest in 64-bit mode\n");
|
|
|
|
log_component_list();
|
|
|
|
/* Have one command line that is parsed and saved in /proc/cmdline */
|
|
/* boot_command_line has been already set up in early.c */
|
|
*cmdline_p = boot_command_line;
|
|
|
|
ROOT_DEV = Root_RAM0;
|
|
|
|
setup_initial_init_mm(_text, _etext, _edata, _end);
|
|
|
|
if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
|
|
nospec_auto_detect();
|
|
|
|
jump_label_init();
|
|
parse_early_param();
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
/* Deactivate elfcorehdr= kernel parameter */
|
|
elfcorehdr_addr = ELFCORE_ADDR_MAX;
|
|
#endif
|
|
|
|
os_info_init();
|
|
setup_ipl();
|
|
setup_task_size();
|
|
setup_control_program_code();
|
|
|
|
/* Do some memory reservations *before* memory is added to memblock */
|
|
reserve_kernel();
|
|
reserve_initrd();
|
|
reserve_certificate_list();
|
|
reserve_mem_detect_info();
|
|
memblock_set_current_limit(ident_map_size);
|
|
memblock_allow_resize();
|
|
|
|
/* Get information about *all* installed memory */
|
|
memblock_add_mem_detect_info();
|
|
|
|
free_mem_detect_info();
|
|
setup_memory_end();
|
|
memblock_dump_all();
|
|
setup_memory();
|
|
|
|
relocate_amode31_section();
|
|
setup_cr();
|
|
setup_uv();
|
|
dma_contiguous_reserve(ident_map_size);
|
|
vmcp_cma_reserve();
|
|
if (MACHINE_HAS_EDAT2)
|
|
hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
|
|
|
|
check_initrd();
|
|
reserve_crashkernel();
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
/*
|
|
* Be aware that smp_save_dump_cpus() triggers a system reset.
|
|
* Therefore CPU and device initialization should be done afterwards.
|
|
*/
|
|
smp_save_dump_cpus();
|
|
#endif
|
|
|
|
setup_resources();
|
|
setup_lowcore_dat_off();
|
|
smp_fill_possible_mask();
|
|
cpu_detect_mhz_feature();
|
|
cpu_init();
|
|
numa_setup();
|
|
smp_detect_cpus();
|
|
topology_init_early();
|
|
|
|
if (test_facility(193))
|
|
static_branch_enable(&cpu_has_bear);
|
|
|
|
/*
|
|
* Create kernel page tables and switch to virtual addressing.
|
|
*/
|
|
paging_init();
|
|
|
|
/*
|
|
* After paging_init created the kernel page table, the new PSWs
|
|
* in lowcore can now run with DAT enabled.
|
|
*/
|
|
setup_lowcore_dat_on();
|
|
|
|
/* Setup default console */
|
|
conmode_default();
|
|
set_preferred_console();
|
|
|
|
apply_alternative_instructions();
|
|
if (IS_ENABLED(CONFIG_EXPOLINE))
|
|
nospec_init_branches();
|
|
|
|
/* Setup zfcp/nvme dump support */
|
|
setup_zfcpdump();
|
|
|
|
/* Add system specific data to the random pool */
|
|
setup_randomness();
|
|
}
|