1211 строки
32 KiB
C
1211 строки
32 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-contiguous.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 <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 "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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unsigned long elf_hwcap __read_mostly = 0;
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char elf_platform[ELF_PLATFORM_SIZE];
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unsigned long int_hwcap = 0;
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#ifdef CONFIG_PROTECTED_VIRTUALIZATION_GUEST
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int __bootdata_preserved(prot_virt_guest);
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#endif
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int __bootdata(noexec_disabled);
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int __bootdata(memory_end_set);
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unsigned long __bootdata(memory_end);
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unsigned long __bootdata(max_physmem_end);
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struct mem_detect_info __bootdata(mem_detect);
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struct exception_table_entry *__bootdata_preserved(__start_dma_ex_table);
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struct exception_table_entry *__bootdata_preserved(__stop_dma_ex_table);
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unsigned long __bootdata_preserved(__swsusp_reset_dma);
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unsigned long __bootdata_preserved(__stext_dma);
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unsigned long __bootdata_preserved(__etext_dma);
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unsigned long __bootdata_preserved(__sdma);
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unsigned long __bootdata_preserved(__edma);
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unsigned long __bootdata_preserved(__kaslr_offset);
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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 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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/*
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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("ttyS", 1, 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 (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
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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 (strncmp(str, "3215", 5) == 0)
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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 (strncmp(str, "3270", 5) == 0)
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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 (strncmp(ptr + 8, "3270", 4) == 0) {
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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 (strncmp(ptr + 8, "3215", 4) == 0) {
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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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if (IS_ENABLED(CONFIG_VT) && IS_ENABLED(CONFIG_DUMMY_CONSOLE))
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conswitchp = &dummy_con;
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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 (ipl_info.type != IPL_TYPE_FCP_DUMP)
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return;
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if (OLDMEM_BASE)
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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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static int __init parse_vmalloc(char *arg)
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{
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if (!arg)
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return -EINVAL;
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VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
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return 0;
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}
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early_param("vmalloc", parse_vmalloc);
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void *restart_stack __section(.data);
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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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return (unsigned long)
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__vmalloc_node_range(THREAD_SIZE, THREAD_SIZE,
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VMALLOC_START, VMALLOC_END,
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THREADINFO_GFP,
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PAGE_KERNEL, 0, NUMA_NO_NODE,
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__builtin_return_address(0));
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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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static int __init async_stack_realloc(void)
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{
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unsigned long old, new;
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old = S390_lowcore.async_stack - STACK_INIT_OFFSET;
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new = stack_alloc();
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if (!new)
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panic("Couldn't allocate async stack");
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S390_lowcore.async_stack = new + STACK_INIT_OFFSET;
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free_pages(old, THREAD_SIZE_ORDER);
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return 0;
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}
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early_initcall(async_stack_realloc);
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void __init arch_call_rest_init(void)
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{
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struct stack_frame *frame;
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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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frame = (struct stack_frame *) stack;
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memset(frame, 0, sizeof(*frame));
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/* Branch to rest_init on the new stack, never returns */
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asm volatile(
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" la 15,0(%[_frame])\n"
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" jg rest_init\n"
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: : [_frame] "a" (frame));
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}
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static void __init setup_lowcore_dat_off(void)
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{
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struct lowcore *lc;
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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 = PSW_KERNEL_BITS | 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 = PSW_KERNEL_BITS |
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PSW_MASK_IO | PSW_MASK_EXT | 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 = PSW_KERNEL_BITS | 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 = PSW_KERNEL_BITS | 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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lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
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memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
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sizeof(lc->stfle_fac_list));
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memcpy(lc->alt_stfle_fac_list, S390_lowcore.alt_stfle_fac_list,
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sizeof(lc->alt_stfle_fac_list));
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nmi_alloc_boot_cpu(lc);
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vdso_alloc_boot_cpu(lc);
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lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
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lc->async_enter_timer = S390_lowcore.async_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);
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if (!restart_stack)
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panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
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__func__, THREAD_SIZE, THREAD_SIZE);
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restart_stack += STACK_INIT_OFFSET;
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/*
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* Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
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* restart data to the absolute zero lowcore. This is necessary if
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* PSW restart is done on an offline CPU that has lowcore zero.
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*/
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lc->restart_stack = (unsigned long) restart_stack;
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lc->restart_fn = (unsigned long) do_restart;
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lc->restart_data = 0;
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lc->restart_source = -1UL;
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/* Setup absolute zero lowcore */
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mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
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mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
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mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
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mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
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mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
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#ifdef CONFIG_SMP
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lc->spinlock_lockval = arch_spin_lockval(0);
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lc->spinlock_index = 0;
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arch_spin_lock_setup(0);
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#endif
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lc->br_r1_trampoline = 0x07f1; /* br %r1 */
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set_prefix((u32)(unsigned long) lc);
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lowcore_ptr[0] = lc;
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}
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static void __init setup_lowcore_dat_on(void)
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{
|
|
__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_set_bit(0, 28);
|
|
}
|
|
|
|
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;
|
|
struct memblock_region *reg;
|
|
int j;
|
|
|
|
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_memblock(memory, reg) {
|
|
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 = reg->base;
|
|
res->end = reg->base + reg->size - 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_reserve(crashk_res.start, resource_size(&crashk_res));
|
|
insert_resource(&iomem_resource, &crashk_res);
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void __init setup_memory_end(void)
|
|
{
|
|
unsigned long vmax, vmalloc_size, tmp;
|
|
|
|
/* Choose kernel address space layout: 3 or 4 levels. */
|
|
vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
|
|
if (IS_ENABLED(CONFIG_KASAN)) {
|
|
vmax = IS_ENABLED(CONFIG_KASAN_S390_4_LEVEL_PAGING)
|
|
? _REGION1_SIZE
|
|
: _REGION2_SIZE;
|
|
} else {
|
|
tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
|
|
tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
|
|
if (tmp + vmalloc_size + MODULES_LEN <= _REGION2_SIZE)
|
|
vmax = _REGION2_SIZE; /* 3-level kernel page table */
|
|
else
|
|
vmax = _REGION1_SIZE; /* 4-level kernel page table */
|
|
}
|
|
|
|
/* module area is at the end of the kernel address space. */
|
|
MODULES_END = vmax;
|
|
MODULES_VADDR = MODULES_END - MODULES_LEN;
|
|
VMALLOC_END = MODULES_VADDR;
|
|
VMALLOC_START = VMALLOC_END - vmalloc_size;
|
|
|
|
/* Split remaining virtual space between 1:1 mapping & vmemmap array */
|
|
tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
|
|
/* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
|
|
tmp = SECTION_ALIGN_UP(tmp);
|
|
tmp = VMALLOC_START - tmp * sizeof(struct page);
|
|
tmp &= ~((vmax >> 11) - 1); /* align to page table level */
|
|
tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
|
|
vmemmap = (struct page *) tmp;
|
|
|
|
/* Take care that memory_end is set and <= vmemmap */
|
|
memory_end = min(memory_end ?: max_physmem_end, (unsigned long)vmemmap);
|
|
#ifdef CONFIG_KASAN
|
|
/* fit in kasan shadow memory region between 1:1 and vmemmap */
|
|
memory_end = min(memory_end, KASAN_SHADOW_START);
|
|
vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END);
|
|
#endif
|
|
max_pfn = max_low_pfn = PFN_DOWN(memory_end);
|
|
memblock_remove(memory_end, ULONG_MAX);
|
|
|
|
pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
|
|
}
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
|
|
/*
|
|
* When kdump is enabled, we have to ensure that no memory from
|
|
* the area [0 - crashkernel memory size] and
|
|
* [crashk_res.start - crashk_res.end] is set offline.
|
|
*/
|
|
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;
|
|
if (arg->start_pfn > PFN_DOWN(crashk_res.end))
|
|
return NOTIFY_OK;
|
|
if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
|
|
return NOTIFY_OK;
|
|
return NOTIFY_BAD;
|
|
}
|
|
|
|
static struct notifier_block kdump_mem_nb = {
|
|
.notifier_call = kdump_mem_notifier,
|
|
};
|
|
|
|
#endif
|
|
|
|
/*
|
|
* Make sure that the area behind memory_end is protected
|
|
*/
|
|
static void reserve_memory_end(void)
|
|
{
|
|
if (memory_end_set)
|
|
memblock_reserve(memory_end, ULONG_MAX);
|
|
}
|
|
|
|
/*
|
|
* Make sure that oldmem, where the dump is stored, is protected
|
|
*/
|
|
static void reserve_oldmem(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (OLDMEM_BASE)
|
|
/* Forget all memory above the running kdump system */
|
|
memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Make sure that oldmem, where the dump is stored, is protected
|
|
*/
|
|
static void remove_oldmem(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (OLDMEM_BASE)
|
|
/* Forget all memory above the running kdump system */
|
|
memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
|
|
#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, memory_end, &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_BASE;
|
|
high = low + crash_size;
|
|
if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_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_find_in_range(low, high, crash_size,
|
|
KEXEC_CRASH_MEM_ALIGN);
|
|
}
|
|
|
|
if (!crash_base) {
|
|
pr_info("crashkernel reservation failed: %s\n",
|
|
"no suitable area found");
|
|
return;
|
|
}
|
|
|
|
if (register_memory_notifier(&kdump_mem_nb))
|
|
return;
|
|
|
|
if (!OLDMEM_BASE && 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_START || !INITRD_SIZE)
|
|
return;
|
|
initrd_start = INITRD_START;
|
|
initrd_end = initrd_start + INITRD_SIZE;
|
|
memblock_reserve(INITRD_START, INITRD_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_free(start, size);
|
|
}
|
|
|
|
static void __init memblock_physmem_add(phys_addr_t start, phys_addr_t size)
|
|
{
|
|
memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
|
|
start, start + size - 1);
|
|
memblock_add_range(&memblock.memory, start, size, 0, 0);
|
|
memblock_add_range(&memblock.physmem, start, size, 0, 0);
|
|
}
|
|
|
|
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;
|
|
|
|
memblock_dbg("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_physmem_add(start, end - start);
|
|
memblock_set_bottom_up(false);
|
|
memblock_dump_all();
|
|
}
|
|
|
|
/*
|
|
* Check for initrd being in usable memory
|
|
*/
|
|
static void __init check_initrd(void)
|
|
{
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
if (INITRD_START && INITRD_SIZE &&
|
|
!memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
|
|
pr_err("The initial RAM disk does not fit into the memory\n");
|
|
memblock_free(INITRD_START, INITRD_SIZE);
|
|
initrd_start = initrd_end = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Reserve memory used for lowcore/command line/kernel image.
|
|
*/
|
|
static void __init reserve_kernel(void)
|
|
{
|
|
unsigned long start_pfn = PFN_UP(__pa(_end));
|
|
|
|
memblock_reserve(0, HEAD_END);
|
|
memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
|
|
- (unsigned long)_stext);
|
|
memblock_reserve(__sdma, __edma - __sdma);
|
|
}
|
|
|
|
static void __init setup_memory(void)
|
|
{
|
|
struct memblock_region *reg;
|
|
|
|
/*
|
|
* Init storage key for present memory
|
|
*/
|
|
for_each_memblock(memory, reg) {
|
|
storage_key_init_range(reg->base, reg->base + reg->size);
|
|
}
|
|
psw_set_key(PAGE_DEFAULT_KEY);
|
|
|
|
/* Only cosmetics */
|
|
memblock_enforce_memory_limit(memblock_end_of_DRAM());
|
|
}
|
|
|
|
/*
|
|
* Setup hardware capabilities.
|
|
*/
|
|
static int __init setup_hwcaps(void)
|
|
{
|
|
static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
|
|
struct cpuid cpu_id;
|
|
int i;
|
|
|
|
/*
|
|
* The store facility list bits numbers as found in the principles
|
|
* of operation are numbered with bit 1UL<<31 as number 0 to
|
|
* bit 1UL<<0 as number 31.
|
|
* Bit 0: instructions named N3, "backported" to esa-mode
|
|
* Bit 2: z/Architecture mode is active
|
|
* Bit 7: the store-facility-list-extended facility is installed
|
|
* Bit 17: the message-security assist is installed
|
|
* Bit 19: the long-displacement facility is installed
|
|
* Bit 21: the extended-immediate facility is installed
|
|
* Bit 22: extended-translation facility 3 is installed
|
|
* Bit 30: extended-translation facility 3 enhancement facility
|
|
* These get translated to:
|
|
* HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
|
|
* HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
|
|
* HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
|
|
* HWCAP_S390_ETF3EH bit 8 (22 && 30).
|
|
*/
|
|
for (i = 0; i < 6; i++)
|
|
if (test_facility(stfl_bits[i]))
|
|
elf_hwcap |= 1UL << i;
|
|
|
|
if (test_facility(22) && test_facility(30))
|
|
elf_hwcap |= HWCAP_S390_ETF3EH;
|
|
|
|
/*
|
|
* Check for additional facilities with store-facility-list-extended.
|
|
* stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
|
|
* and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
|
|
* as stored by stfl, bits 32-xxx contain additional facilities.
|
|
* How many facility words are stored depends on the number of
|
|
* doublewords passed to the instruction. The additional facilities
|
|
* are:
|
|
* Bit 42: decimal floating point facility is installed
|
|
* Bit 44: perform floating point operation facility is installed
|
|
* translated to:
|
|
* HWCAP_S390_DFP bit 6 (42 && 44).
|
|
*/
|
|
if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
|
|
elf_hwcap |= HWCAP_S390_DFP;
|
|
|
|
/*
|
|
* Huge page support HWCAP_S390_HPAGE is bit 7.
|
|
*/
|
|
if (MACHINE_HAS_EDAT1)
|
|
elf_hwcap |= HWCAP_S390_HPAGE;
|
|
|
|
/*
|
|
* 64-bit register support for 31-bit processes
|
|
* HWCAP_S390_HIGH_GPRS is bit 9.
|
|
*/
|
|
elf_hwcap |= HWCAP_S390_HIGH_GPRS;
|
|
|
|
/*
|
|
* Transactional execution support HWCAP_S390_TE is bit 10.
|
|
*/
|
|
if (MACHINE_HAS_TE)
|
|
elf_hwcap |= HWCAP_S390_TE;
|
|
|
|
/*
|
|
* Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
|
|
* can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
|
|
* instead of facility bit 129.
|
|
*/
|
|
if (MACHINE_HAS_VX) {
|
|
elf_hwcap |= HWCAP_S390_VXRS;
|
|
if (test_facility(134))
|
|
elf_hwcap |= HWCAP_S390_VXRS_EXT;
|
|
if (test_facility(135))
|
|
elf_hwcap |= HWCAP_S390_VXRS_BCD;
|
|
if (test_facility(148))
|
|
elf_hwcap |= HWCAP_S390_VXRS_EXT2;
|
|
if (test_facility(152))
|
|
elf_hwcap |= HWCAP_S390_VXRS_PDE;
|
|
}
|
|
if (test_facility(150))
|
|
elf_hwcap |= HWCAP_S390_SORT;
|
|
if (test_facility(151))
|
|
elf_hwcap |= HWCAP_S390_DFLT;
|
|
|
|
/*
|
|
* Guarded storage support HWCAP_S390_GS is bit 12.
|
|
*/
|
|
if (MACHINE_HAS_GS)
|
|
elf_hwcap |= HWCAP_S390_GS;
|
|
|
|
get_cpu_id(&cpu_id);
|
|
add_device_randomness(&cpu_id, sizeof(cpu_id));
|
|
switch (cpu_id.machine) {
|
|
case 0x2064:
|
|
case 0x2066:
|
|
default: /* Use "z900" as default for 64 bit kernels. */
|
|
strcpy(elf_platform, "z900");
|
|
break;
|
|
case 0x2084:
|
|
case 0x2086:
|
|
strcpy(elf_platform, "z990");
|
|
break;
|
|
case 0x2094:
|
|
case 0x2096:
|
|
strcpy(elf_platform, "z9-109");
|
|
break;
|
|
case 0x2097:
|
|
case 0x2098:
|
|
strcpy(elf_platform, "z10");
|
|
break;
|
|
case 0x2817:
|
|
case 0x2818:
|
|
strcpy(elf_platform, "z196");
|
|
break;
|
|
case 0x2827:
|
|
case 0x2828:
|
|
strcpy(elf_platform, "zEC12");
|
|
break;
|
|
case 0x2964:
|
|
case 0x2965:
|
|
strcpy(elf_platform, "z13");
|
|
break;
|
|
case 0x3906:
|
|
case 0x3907:
|
|
strcpy(elf_platform, "z14");
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Virtualization support HWCAP_INT_SIE is bit 0.
|
|
*/
|
|
if (sclp.has_sief2)
|
|
int_hwcap |= HWCAP_INT_SIE;
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(setup_hwcaps);
|
|
|
|
/*
|
|
* Add system information as device randomness
|
|
*/
|
|
static void __init setup_randomness(void)
|
|
{
|
|
struct sysinfo_3_2_2 *vmms;
|
|
|
|
vmms = (struct sysinfo_3_2_2 *) memblock_phys_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((unsigned long) 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_linux = 0,
|
|
.cpvc_distro = {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_IPLSR)
|
|
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;
|
|
|
|
/* Is init_mm really needed? */
|
|
init_mm.start_code = PAGE_OFFSET;
|
|
init_mm.end_code = (unsigned long) _etext;
|
|
init_mm.end_data = (unsigned long) _edata;
|
|
init_mm.brk = (unsigned long) _end;
|
|
|
|
if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
|
|
nospec_auto_detect();
|
|
|
|
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_memory_end();
|
|
reserve_oldmem();
|
|
reserve_kernel();
|
|
reserve_initrd();
|
|
reserve_certificate_list();
|
|
reserve_mem_detect_info();
|
|
memblock_allow_resize();
|
|
|
|
/* Get information about *all* installed memory */
|
|
memblock_add_mem_detect_info();
|
|
|
|
free_mem_detect_info();
|
|
remove_oldmem();
|
|
|
|
/*
|
|
* Make sure all chunks are MAX_ORDER aligned so we don't need the
|
|
* extra checks that HOLES_IN_ZONE would require.
|
|
*
|
|
* Is this still required?
|
|
*/
|
|
memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
|
|
|
|
setup_memory_end();
|
|
setup_memory();
|
|
dma_contiguous_reserve(memory_end);
|
|
vmcp_cma_reserve();
|
|
|
|
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();
|
|
|
|
/*
|
|
* 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 zfcpdump support */
|
|
setup_zfcpdump();
|
|
|
|
/* Add system specific data to the random pool */
|
|
setup_randomness();
|
|
}
|