![Michael Holzheu](/assets/img/avatar_default.png)
Currently there are two s390 kernel dump config options "CONFIG_ZFCPDUMP" and "CONFIG_CRASH_DUMP". In order to keep things simple and because the "CONFIG_ZFCPDUMP" option already has a dependency to "CONFIG_CRASH_DUMP" remove the CONFIG_ZFCPDUMP option. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Reviewed-by: Eric Farman <farman@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
935 lines
25 KiB
C
935 lines
25 KiB
C
/*
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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/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/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/bootmem.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/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/ftrace.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 <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/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/kvm_virtio.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 "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 = 0;
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char elf_platform[ELF_PLATFORM_SIZE];
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int __initdata memory_end_set;
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unsigned long __initdata memory_end;
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unsigned long __initdata max_physmem_end;
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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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#ifdef CONFIG_64BIT
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unsigned long MODULES_VADDR;
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unsigned long MODULES_END;
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#endif
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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 (MACHINE_IS_KVM) {
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if (sclp_has_vt220())
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add_preferred_console("ttyS", 1, NULL);
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else if (sclp_has_linemode())
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add_preferred_console("ttyS", 0, NULL);
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else
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add_preferred_console("hvc", 0, NULL);
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} else 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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}
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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 {
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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 (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 early_parse_mem(char *p)
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{
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memory_end = memparse(p, &p);
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memory_end &= PAGE_MASK;
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memory_end_set = 1;
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return 0;
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}
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early_param("mem", early_parse_mem);
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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 __attribute__((__section__(".data")));
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static void __init setup_lowcore(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 * 4096);
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lc = __alloc_bootmem_low(LC_PAGES * PAGE_SIZE, LC_PAGES * PAGE_SIZE, 0);
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lc->restart_psw.mask = PSW_KERNEL_BITS;
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lc->restart_psw.addr =
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PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
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lc->external_new_psw.mask = PSW_KERNEL_BITS |
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PSW_MASK_DAT | PSW_MASK_MCHECK;
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lc->external_new_psw.addr =
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PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
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lc->svc_new_psw.mask = PSW_KERNEL_BITS |
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PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
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lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
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lc->program_new_psw.mask = PSW_KERNEL_BITS |
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PSW_MASK_DAT | PSW_MASK_MCHECK;
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lc->program_new_psw.addr =
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PSW_ADDR_AMODE | (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 =
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PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
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lc->io_new_psw.mask = PSW_KERNEL_BITS |
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PSW_MASK_DAT | PSW_MASK_MCHECK;
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lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
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lc->clock_comparator = -1ULL;
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lc->kernel_stack = ((unsigned long) &init_thread_union)
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+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
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lc->async_stack = (unsigned long)
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__alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0)
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+ ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
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lc->panic_stack = (unsigned long)
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__alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0)
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+ PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
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lc->current_task = (unsigned long) init_thread_union.thread_info.task;
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lc->thread_info = (unsigned long) &init_thread_union;
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lc->machine_flags = S390_lowcore.machine_flags;
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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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MAX_FACILITY_BIT/8);
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#ifndef CONFIG_64BIT
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if (MACHINE_HAS_IEEE) {
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lc->extended_save_area_addr = (__u32)
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__alloc_bootmem_low(PAGE_SIZE, PAGE_SIZE, 0);
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/* enable extended save area */
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__ctl_set_bit(14, 29);
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}
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#else
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lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
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#endif
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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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lc->ftrace_func = S390_lowcore.ftrace_func;
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restart_stack = __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0);
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restart_stack += ASYNC_SIZE;
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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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#endif
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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 struct resource code_resource = {
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.name = "Kernel code",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource data_resource = {
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.name = "Kernel data",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource bss_resource = {
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.name = "Kernel bss",
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.flags = IORESOURCE_BUSY | IORESOURCE_MEM,
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};
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static struct resource __initdata *standard_resources[] = {
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&code_resource,
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&data_resource,
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&bss_resource,
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};
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static void __init setup_resources(void)
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{
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struct resource *res, *std_res, *sub_res;
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struct memblock_region *reg;
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int j;
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code_resource.start = (unsigned long) &_text;
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code_resource.end = (unsigned long) &_etext - 1;
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data_resource.start = (unsigned long) &_etext;
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data_resource.end = (unsigned long) &_edata - 1;
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bss_resource.start = (unsigned long) &__bss_start;
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bss_resource.end = (unsigned long) &__bss_stop - 1;
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for_each_memblock(memory, reg) {
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res = alloc_bootmem_low(sizeof(*res));
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res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
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res->name = "System RAM";
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res->start = reg->base;
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res->end = reg->base + reg->size - 1;
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request_resource(&iomem_resource, res);
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for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
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std_res = standard_resources[j];
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if (std_res->start < res->start ||
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std_res->start > res->end)
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continue;
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if (std_res->end > res->end) {
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sub_res = alloc_bootmem_low(sizeof(*sub_res));
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*sub_res = *std_res;
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sub_res->end = res->end;
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std_res->start = res->end + 1;
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request_resource(res, sub_res);
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} else {
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request_resource(res, std_res);
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}
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}
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}
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}
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static void __init setup_memory_end(void)
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{
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unsigned long vmax, vmalloc_size, tmp;
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/* Choose kernel address space layout: 2, 3, or 4 levels. */
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#ifdef CONFIG_64BIT
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vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
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tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
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tmp = tmp * (sizeof(struct page) + PAGE_SIZE) + vmalloc_size;
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if (tmp <= (1UL << 42))
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vmax = 1UL << 42; /* 3-level kernel page table */
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else
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vmax = 1UL << 53; /* 4-level kernel page table */
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/* module area is at the end of the kernel address space. */
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MODULES_END = vmax;
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MODULES_VADDR = MODULES_END - MODULES_LEN;
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VMALLOC_END = MODULES_VADDR;
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#else
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vmalloc_size = VMALLOC_END ?: 96UL << 20;
|
|
vmax = 1UL << 31; /* 2-level kernel page table */
|
|
/* vmalloc area is at the end of the kernel address space. */
|
|
VMALLOC_END = vmax;
|
|
#endif
|
|
VMALLOC_START = vmax - 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, tmp);
|
|
max_pfn = max_low_pfn = PFN_DOWN(memory_end);
|
|
memblock_remove(memory_end, ULONG_MAX);
|
|
|
|
pr_notice("Max memory size: %luMB\n", memory_end >> 20);
|
|
}
|
|
|
|
static void __init setup_vmcoreinfo(void)
|
|
{
|
|
mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
|
|
}
|
|
|
|
#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 (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)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
|
|
!OLDMEM_BASE && sclp_get_hsa_size()) {
|
|
memory_end = sclp_get_hsa_size();
|
|
memory_end &= PAGE_MASK;
|
|
memory_end_set = 1;
|
|
}
|
|
#endif
|
|
if (!memory_end_set)
|
|
return;
|
|
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_get_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;
|
|
insert_resource(&iomem_resource, &crashk_res);
|
|
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
|
|
initrd_start = INITRD_START;
|
|
initrd_end = initrd_start + INITRD_SIZE;
|
|
memblock_reserve(INITRD_START, INITRD_SIZE);
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* 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("initrd does not fit memory.\n");
|
|
memblock_free(INITRD_START, INITRD_SIZE);
|
|
initrd_start = initrd_end = 0;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Reserve all kernel text
|
|
*/
|
|
static void __init reserve_kernel(void)
|
|
{
|
|
unsigned long start_pfn;
|
|
start_pfn = PFN_UP(__pa(&_end));
|
|
|
|
/*
|
|
* Reserve memory used for lowcore/command line/kernel image.
|
|
*/
|
|
memblock_reserve(0, (unsigned long)_ehead);
|
|
memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
|
|
- (unsigned long)_stext);
|
|
}
|
|
|
|
static void __init reserve_elfcorehdr(void)
|
|
{
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
if (is_kdump_kernel())
|
|
memblock_reserve(elfcorehdr_addr - OLDMEM_BASE,
|
|
PAGE_ALIGN(elfcorehdr_size));
|
|
#endif
|
|
}
|
|
|
|
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 void __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_HPAGE)
|
|
elf_hwcap |= HWCAP_S390_HPAGE;
|
|
|
|
#if defined(CONFIG_64BIT)
|
|
/*
|
|
* 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 (test_facility(50) && test_facility(73))
|
|
elf_hwcap |= HWCAP_S390_TE;
|
|
#endif
|
|
|
|
get_cpu_id(&cpu_id);
|
|
switch (cpu_id.machine) {
|
|
case 0x9672:
|
|
#if !defined(CONFIG_64BIT)
|
|
default: /* Use "g5" as default for 31 bit kernels. */
|
|
#endif
|
|
strcpy(elf_platform, "g5");
|
|
break;
|
|
case 0x2064:
|
|
case 0x2066:
|
|
#if defined(CONFIG_64BIT)
|
|
default: /* Use "z900" as default for 64 bit kernels. */
|
|
#endif
|
|
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;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
#ifndef CONFIG_64BIT
|
|
if (MACHINE_IS_VM)
|
|
pr_info("Linux is running as a z/VM "
|
|
"guest operating system in 31-bit mode\n");
|
|
else if (MACHINE_IS_LPAR)
|
|
pr_info("Linux is running natively in 31-bit mode\n");
|
|
if (MACHINE_HAS_IEEE)
|
|
pr_info("The hardware system has IEEE compatible "
|
|
"floating point units\n");
|
|
else
|
|
pr_info("The hardware system has no IEEE compatible "
|
|
"floating point units\n");
|
|
#else /* CONFIG_64BIT */
|
|
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");
|
|
#endif /* CONFIG_64BIT */
|
|
|
|
/* 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;
|
|
|
|
parse_early_param();
|
|
os_info_init();
|
|
setup_ipl();
|
|
|
|
/* Do some memory reservations *before* memory is added to memblock */
|
|
reserve_memory_end();
|
|
reserve_oldmem();
|
|
reserve_kernel();
|
|
reserve_initrd();
|
|
reserve_elfcorehdr();
|
|
memblock_allow_resize();
|
|
|
|
/* Get information about *all* installed memory */
|
|
detect_memory_memblock();
|
|
|
|
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();
|
|
|
|
check_initrd();
|
|
reserve_crashkernel();
|
|
|
|
setup_resources();
|
|
setup_vmcoreinfo();
|
|
setup_lowcore();
|
|
smp_fill_possible_mask();
|
|
cpu_init();
|
|
s390_init_cpu_topology();
|
|
|
|
/*
|
|
* Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
|
|
*/
|
|
setup_hwcaps();
|
|
|
|
/*
|
|
* Create kernel page tables and switch to virtual addressing.
|
|
*/
|
|
paging_init();
|
|
|
|
/* Setup default console */
|
|
conmode_default();
|
|
set_preferred_console();
|
|
|
|
/* Setup zfcpdump support */
|
|
setup_zfcpdump();
|
|
}
|
|
|
|
#ifdef CONFIG_32BIT
|
|
static int no_removal_warning __initdata;
|
|
|
|
static int __init parse_no_removal_warning(char *str)
|
|
{
|
|
no_removal_warning = 1;
|
|
return 0;
|
|
}
|
|
__setup("no_removal_warning", parse_no_removal_warning);
|
|
|
|
static int __init removal_warning(void)
|
|
{
|
|
if (no_removal_warning)
|
|
return 0;
|
|
printk(KERN_ALERT "\n\n");
|
|
printk(KERN_CONT "Warning - you are using a 31 bit kernel!\n\n");
|
|
printk(KERN_CONT "We plan to remove 31 bit kernel support from the kernel sources in March 2015.\n");
|
|
printk(KERN_CONT "Currently we assume that nobody is using the 31 bit kernel on old 31 bit\n");
|
|
printk(KERN_CONT "hardware anymore. If you think that the code should not be removed and also\n");
|
|
printk(KERN_CONT "future versions of the Linux kernel should be able to run in 31 bit mode\n");
|
|
printk(KERN_CONT "please let us know. Please write to:\n");
|
|
printk(KERN_CONT "linux390@de.ibm.com (mail address) and/or\n");
|
|
printk(KERN_CONT "linux-s390@vger.kernel.org (mailing list).\n\n");
|
|
printk(KERN_CONT "Thank you!\n\n");
|
|
printk(KERN_CONT "If this kernel runs on a 64 bit machine you may consider using a 64 bit kernel.\n");
|
|
printk(KERN_CONT "This message can be disabled with the \"no_removal_warning\" kernel parameter.\n");
|
|
schedule_timeout_uninterruptible(300 * HZ);
|
|
return 0;
|
|
}
|
|
early_initcall(removal_warning);
|
|
#endif
|