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1208 lines
32 KiB
1208 lines
32 KiB
// 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 ([email protected]), |
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* Martin Schwidefsky ([email protected]) |
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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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/* |
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* This file handles the architecture-dependent parts of initialization |
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*/ |
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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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|
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#include <linux/errno.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <linux/sched/task.h> |
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#include <linux/cpu.h> |
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#include <linux/kernel.h> |
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#include <linux/memblock.h> |
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#include <linux/mm.h> |
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#include <linux/stddef.h> |
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#include <linux/unistd.h> |
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#include <linux/ptrace.h> |
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#include <linux/random.h> |
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#include <linux/user.h> |
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#include <linux/tty.h> |
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#include <linux/ioport.h> |
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#include <linux/delay.h> |
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#include <linux/init.h> |
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#include <linux/initrd.h> |
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#include <linux/root_dev.h> |
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#include <linux/console.h> |
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#include <linux/kernel_stat.h> |
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#include <linux/dma-map-ops.h> |
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#include <linux/device.h> |
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#include <linux/notifier.h> |
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#include <linux/pfn.h> |
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#include <linux/ctype.h> |
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#include <linux/reboot.h> |
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#include <linux/topology.h> |
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#include <linux/kexec.h> |
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#include <linux/crash_dump.h> |
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#include <linux/memory.h> |
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#include <linux/compat.h> |
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#include <linux/start_kernel.h> |
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#include <linux/hugetlb.h> |
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|
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#include <asm/boot_data.h> |
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#include <asm/ipl.h> |
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#include <asm/facility.h> |
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#include <asm/smp.h> |
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#include <asm/mmu_context.h> |
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#include <asm/cpcmd.h> |
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#include <asm/lowcore.h> |
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#include <asm/nmi.h> |
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#include <asm/irq.h> |
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#include <asm/page.h> |
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#include <asm/ptrace.h> |
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#include <asm/sections.h> |
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#include <asm/ebcdic.h> |
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#include <asm/diag.h> |
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#include <asm/os_info.h> |
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#include <asm/sclp.h> |
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#include <asm/stacktrace.h> |
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#include <asm/sysinfo.h> |
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#include <asm/numa.h> |
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#include <asm/alternative.h> |
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#include <asm/nospec-branch.h> |
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#include <asm/mem_detect.h> |
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#include <asm/uv.h> |
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#include <asm/asm-offsets.h> |
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#include "entry.h" |
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|
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/* |
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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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|
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unsigned int console_devno = -1; |
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EXPORT_SYMBOL(console_devno); |
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|
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unsigned int console_irq = -1; |
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EXPORT_SYMBOL(console_irq); |
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|
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unsigned long elf_hwcap __read_mostly = 0; |
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char elf_platform[ELF_PLATFORM_SIZE]; |
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|
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unsigned long int_hwcap = 0; |
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|
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int __bootdata(noexec_disabled); |
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unsigned long __bootdata(ident_map_size); |
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unsigned long __bootdata(vmalloc_size); |
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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(__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 int __bootdata_preserved(zlib_dfltcc_support); |
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EXPORT_SYMBOL(zlib_dfltcc_support); |
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|
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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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|
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struct page *vmemmap; |
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EXPORT_SYMBOL(vmemmap); |
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unsigned long vmemmap_size; |
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|
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unsigned long MODULES_VADDR; |
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unsigned long MODULES_END; |
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|
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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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/* |
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* The Write Back bit position in the physaddr is given by the SLPC PCI. |
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* Leaving the mask zero always uses write through which is safe |
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*/ |
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unsigned long mio_wb_bit_mask __ro_after_init; |
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|
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/* |
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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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/* |
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* condev= and conmode= setup parameter. |
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*/ |
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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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|
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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 (!strcmp(str, "hwc") || !strcmp(str, "sclp")) |
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SET_CONSOLE_SCLP; |
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#endif |
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#if defined(CONFIG_TN3215_CONSOLE) |
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if (!strcmp(str, "3215")) |
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SET_CONSOLE_3215; |
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#endif |
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#if defined(CONFIG_TN3270_CONSOLE) |
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if (!strcmp(str, "3270")) |
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SET_CONSOLE_3270; |
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#endif |
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set_preferred_console(); |
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return 1; |
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} |
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__setup("conmode=", conmode_setup); |
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static void __init conmode_default(void) |
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{ |
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char query_buffer[1024]; |
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char *ptr; |
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if (MACHINE_IS_VM) { |
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cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL); |
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console_devno = simple_strtoul(query_buffer + 5, NULL, 16); |
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ptr = strstr(query_buffer, "SUBCHANNEL ="); |
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console_irq = simple_strtoul(ptr + 13, NULL, 16); |
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cpcmd("QUERY TERM", query_buffer, 1024, NULL); |
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ptr = strstr(query_buffer, "CONMODE"); |
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/* |
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* Set the conmode to 3215 so that the device recognition |
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* will set the cu_type of the console to 3215. If the |
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* conmode is 3270 and we don't set it back then both |
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* 3215 and the 3270 driver will try to access the console |
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* device (3215 as console and 3270 as normal tty). |
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*/ |
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cpcmd("TERM CONMODE 3215", NULL, 0, NULL); |
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if (ptr == NULL) { |
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
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SET_CONSOLE_SCLP; |
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#endif |
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return; |
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} |
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if (str_has_prefix(ptr + 8, "3270")) { |
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#if defined(CONFIG_TN3270_CONSOLE) |
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SET_CONSOLE_3270; |
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#elif defined(CONFIG_TN3215_CONSOLE) |
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SET_CONSOLE_3215; |
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#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
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SET_CONSOLE_SCLP; |
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#endif |
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} else if (str_has_prefix(ptr + 8, "3215")) { |
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#if defined(CONFIG_TN3215_CONSOLE) |
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SET_CONSOLE_3215; |
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#elif defined(CONFIG_TN3270_CONSOLE) |
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SET_CONSOLE_3270; |
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#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
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SET_CONSOLE_SCLP; |
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#endif |
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} |
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} else if (MACHINE_IS_KVM) { |
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if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE)) |
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SET_CONSOLE_VT220; |
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else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE)) |
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SET_CONSOLE_SCLP; |
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else |
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SET_CONSOLE_HVC; |
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} else { |
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#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE) |
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SET_CONSOLE_SCLP; |
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#endif |
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} |
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} |
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#ifdef CONFIG_CRASH_DUMP |
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static void __init setup_zfcpdump(void) |
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{ |
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if (!is_ipl_type_dump()) |
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return; |
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if (OLDMEM_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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void *restart_stack; |
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unsigned long stack_alloc(void) |
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{ |
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#ifdef CONFIG_VMAP_STACK |
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return (unsigned long)__vmalloc_node(THREAD_SIZE, THREAD_SIZE, |
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THREADINFO_GFP, 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 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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WRITE_ONCE(S390_lowcore.async_stack, new + STACK_INIT_OFFSET); |
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free_pages(old, THREAD_SIZE_ORDER); |
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old = S390_lowcore.mcck_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 machine check stack"); |
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WRITE_ONCE(S390_lowcore.mcck_stack, new + STACK_INIT_OFFSET); |
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memblock_free_late(old, THREAD_SIZE); |
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return 0; |
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} |
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early_initcall(stack_realloc); |
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void __init arch_call_rest_init(void) |
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{ |
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unsigned long stack; |
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stack = stack_alloc(); |
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if (!stack) |
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panic("Couldn't allocate kernel stack"); |
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current->stack = (void *) stack; |
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#ifdef CONFIG_VMAP_STACK |
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current->stack_vm_area = (void *) stack; |
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#endif |
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set_task_stack_end_magic(current); |
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stack += STACK_INIT_OFFSET; |
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S390_lowcore.kernel_stack = stack; |
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CALL_ON_STACK_NORETURN(rest_init, stack); |
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} |
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static void __init setup_lowcore_dat_off(void) |
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{ |
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unsigned long int_psw_mask = PSW_KERNEL_BITS; |
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unsigned long mcck_stack; |
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struct lowcore *lc; |
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if (IS_ENABLED(CONFIG_KASAN)) |
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int_psw_mask |= PSW_MASK_DAT; |
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/* |
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* Setup lowcore for boot cpu |
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*/ |
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BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE); |
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lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc)); |
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if (!lc) |
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panic("%s: Failed to allocate %zu bytes align=%zx\n", |
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__func__, sizeof(*lc), sizeof(*lc)); |
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lc->restart_psw.mask = PSW_KERNEL_BITS; |
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lc->restart_psw.addr = (unsigned long) restart_int_handler; |
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lc->external_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; |
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lc->external_new_psw.addr = (unsigned long) ext_int_handler; |
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lc->svc_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; |
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lc->svc_new_psw.addr = (unsigned long) system_call; |
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lc->program_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; |
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lc->program_new_psw.addr = (unsigned long) pgm_check_handler; |
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lc->mcck_new_psw.mask = PSW_KERNEL_BITS; |
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lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler; |
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lc->io_new_psw.mask = int_psw_mask | PSW_MASK_MCHECK; |
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lc->io_new_psw.addr = (unsigned long) io_int_handler; |
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lc->clock_comparator = clock_comparator_max; |
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lc->nodat_stack = ((unsigned long) &init_thread_union) |
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+ THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs); |
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lc->current_task = (unsigned long)&init_task; |
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lc->lpp = LPP_MAGIC; |
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lc->machine_flags = S390_lowcore.machine_flags; |
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lc->preempt_count = S390_lowcore.preempt_count; |
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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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lc->sys_enter_timer = S390_lowcore.sys_enter_timer; |
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lc->exit_timer = S390_lowcore.exit_timer; |
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lc->user_timer = S390_lowcore.user_timer; |
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lc->system_timer = S390_lowcore.system_timer; |
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lc->steal_timer = S390_lowcore.steal_timer; |
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lc->last_update_timer = S390_lowcore.last_update_timer; |
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lc->last_update_clock = S390_lowcore.last_update_clock; |
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|
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/* |
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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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/* |
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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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|
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mcck_stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE); |
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if (!mcck_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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lc->mcck_stack = mcck_stack + STACK_INIT_OFFSET; |
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|
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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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|
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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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lc->br_r1_trampoline = 0x07f1; /* br %r1 */ |
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lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW); |
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lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW); |
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|
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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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|
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static void __init setup_lowcore_dat_on(void) |
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{ |
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__ctl_clear_bit(0, 28); |
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S390_lowcore.external_new_psw.mask |= PSW_MASK_DAT; |
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S390_lowcore.svc_new_psw.mask |= PSW_MASK_DAT; |
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S390_lowcore.program_new_psw.mask |= PSW_MASK_DAT; |
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S390_lowcore.io_new_psw.mask |= PSW_MASK_DAT; |
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__ctl_set_bit(0, 28); |
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} |
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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_SYSTEM_RAM, |
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}; |
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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_SYSTEM_RAM, |
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}; |
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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_SYSTEM_RAM, |
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}; |
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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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|
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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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phys_addr_t start, end; |
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int j; |
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u64 i; |
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|
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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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|
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for_each_mem_range(i, &start, &end) { |
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res = memblock_alloc(sizeof(*res), 8); |
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if (!res) |
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panic("%s: Failed to allocate %zu bytes align=0x%x\n", |
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__func__, sizeof(*res), 8); |
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res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM; |
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|
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res->name = "System RAM"; |
|
res->start = start; |
|
/* |
|
* In memblock, end points to the first byte after the |
|
* range while in resourses, end points to the last byte in |
|
* the range. |
|
*/ |
|
res->end = end - 1; |
|
request_resource(&iomem_resource, res); |
|
|
|
for (j = 0; j < ARRAY_SIZE(standard_resources); j++) { |
|
std_res = standard_resources[j]; |
|
if (std_res->start < res->start || |
|
std_res->start > res->end) |
|
continue; |
|
if (std_res->end > res->end) { |
|
sub_res = memblock_alloc(sizeof(*sub_res), 8); |
|
if (!sub_res) |
|
panic("%s: Failed to allocate %zu bytes align=0x%x\n", |
|
__func__, sizeof(*sub_res), 8); |
|
*sub_res = *std_res; |
|
sub_res->end = res->end; |
|
std_res->start = res->end + 1; |
|
request_resource(res, sub_res); |
|
} else { |
|
request_resource(res, std_res); |
|
} |
|
} |
|
} |
|
#ifdef CONFIG_CRASH_DUMP |
|
/* |
|
* Re-add removed crash kernel memory as reserved memory. This makes |
|
* sure it will be mapped with the identity mapping and struct pages |
|
* will be created, so it can be resized later on. |
|
* However add it later since the crash kernel resource should not be |
|
* part of the System RAM resource. |
|
*/ |
|
if (crashk_res.end) { |
|
memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0); |
|
memblock_reserve(crashk_res.start, resource_size(&crashk_res)); |
|
insert_resource(&iomem_resource, &crashk_res); |
|
} |
|
#endif |
|
} |
|
|
|
static void __init setup_ident_map_size(void) |
|
{ |
|
unsigned long vmax, tmp; |
|
|
|
/* Choose kernel address space layout: 3 or 4 levels. */ |
|
tmp = ident_map_size / 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; |
|
if (is_prot_virt_host()) |
|
adjust_to_uv_max(&MODULES_END); |
|
#ifdef CONFIG_KASAN |
|
vmax = _REGION1_SIZE; |
|
MODULES_END = kasan_vmax; |
|
#endif |
|
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 ident_map_size <= vmemmap */ |
|
ident_map_size = min(ident_map_size, (unsigned long)vmemmap); |
|
#ifdef CONFIG_KASAN |
|
ident_map_size = min(ident_map_size, KASAN_SHADOW_START); |
|
#endif |
|
vmemmap_size = SECTION_ALIGN_UP(ident_map_size / PAGE_SIZE) * sizeof(struct page); |
|
#ifdef CONFIG_KASAN |
|
/* move vmemmap above kasan shadow only if stands in a way */ |
|
if (KASAN_SHADOW_END > (unsigned long)vmemmap && |
|
(unsigned long)vmemmap + vmemmap_size > KASAN_SHADOW_START) |
|
vmemmap = max(vmemmap, (struct page *)KASAN_SHADOW_END); |
|
#endif |
|
max_pfn = max_low_pfn = PFN_DOWN(ident_map_size); |
|
memblock_remove(ident_map_size, ULONG_MAX); |
|
|
|
pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20); |
|
} |
|
|
|
#ifdef CONFIG_CRASH_DUMP |
|
|
|
/* |
|
* When kdump is enabled, we have to ensure that no memory from the area |
|
* [0 - crashkernel memory size] is set offline - it will be exchanged with |
|
* the crashkernel memory region when kdump is triggered. The crashkernel |
|
* memory region can never get offlined (pages are unmovable). |
|
*/ |
|
static int kdump_mem_notifier(struct notifier_block *nb, |
|
unsigned long action, void *data) |
|
{ |
|
struct memory_notify *arg = data; |
|
|
|
if (action != MEM_GOING_OFFLINE) |
|
return NOTIFY_OK; |
|
if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res))) |
|
return NOTIFY_BAD; |
|
return NOTIFY_OK; |
|
} |
|
|
|
static struct notifier_block kdump_mem_nb = { |
|
.notifier_call = kdump_mem_notifier, |
|
}; |
|
|
|
#endif |
|
|
|
/* |
|
* Make sure that the area above identity mapping is protected |
|
*/ |
|
static void __init reserve_above_ident_map(void) |
|
{ |
|
memblock_reserve(ident_map_size, ULONG_MAX); |
|
} |
|
|
|
/* |
|
* Make sure that oldmem, where the dump is stored, is protected |
|
*/ |
|
static void __init 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 __init 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, ident_map_size, &crash_size, |
|
&crash_base); |
|
|
|
crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN); |
|
crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN); |
|
if (rc || crash_size == 0) |
|
return; |
|
|
|
if (memblock.memory.regions[0].size < crash_size) { |
|
pr_info("crashkernel reservation failed: %s\n", |
|
"first memory chunk must be at least crashkernel size"); |
|
return; |
|
} |
|
|
|
low = crash_base ?: OLDMEM_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 const char * __init get_mem_info_source(void) |
|
{ |
|
switch (mem_detect.info_source) { |
|
case MEM_DETECT_SCLP_STOR_INFO: |
|
return "sclp storage info"; |
|
case MEM_DETECT_DIAG260: |
|
return "diag260"; |
|
case MEM_DETECT_SCLP_READ_INFO: |
|
return "sclp read info"; |
|
case MEM_DETECT_BIN_SEARCH: |
|
return "binary search"; |
|
} |
|
return "none"; |
|
} |
|
|
|
static void __init memblock_add_mem_detect_info(void) |
|
{ |
|
unsigned long start, end; |
|
int i; |
|
|
|
pr_debug("physmem info source: %s (%hhd)\n", |
|
get_mem_info_source(), mem_detect.info_source); |
|
/* keep memblock lists close to the kernel */ |
|
memblock_set_bottom_up(true); |
|
for_each_mem_detect_block(i, &start, &end) { |
|
memblock_add(start, end - start); |
|
memblock_physmem_add(start, end - start); |
|
} |
|
memblock_set_bottom_up(false); |
|
memblock_set_node(0, ULONG_MAX, &memblock.memory, 0); |
|
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) |
|
{ |
|
phys_addr_t start, end; |
|
u64 i; |
|
|
|
/* |
|
* Init storage key for present memory |
|
*/ |
|
for_each_mem_range(i, &start, &end) |
|
storage_key_init_range(start, end); |
|
|
|
psw_set_key(PAGE_DEFAULT_KEY); |
|
|
|
/* 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_BCD; |
|
if (test_facility(135)) |
|
elf_hwcap |= HWCAP_S390_VXRS_EXT; |
|
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; |
|
case 0x8561: |
|
case 0x8562: |
|
strcpy(elf_platform, "z15"); |
|
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 = 0, |
|
}; |
|
|
|
if (!sclp.has_diag318) |
|
return; |
|
|
|
diag_stat_inc(DIAG_STAT_X318); |
|
asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val)); |
|
} |
|
|
|
/* |
|
* Print the component list from the IPL report |
|
*/ |
|
static void __init log_component_list(void) |
|
{ |
|
struct ipl_rb_component_entry *ptr, *end; |
|
char *str; |
|
|
|
if (!early_ipl_comp_list_addr) |
|
return; |
|
if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL) |
|
pr_info("Linux is running with Secure-IPL enabled\n"); |
|
else |
|
pr_info("Linux is running with Secure-IPL disabled\n"); |
|
ptr = (void *) early_ipl_comp_list_addr; |
|
end = (void *) ptr + early_ipl_comp_list_size; |
|
pr_info("The IPL report contains the following components:\n"); |
|
while (ptr < end) { |
|
if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) { |
|
if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED) |
|
str = "signed, verified"; |
|
else |
|
str = "signed, verification failed"; |
|
} else { |
|
str = "not signed"; |
|
} |
|
pr_info("%016llx - %016llx (%s)\n", |
|
ptr->addr, ptr->addr + ptr->len, str); |
|
ptr++; |
|
} |
|
} |
|
|
|
/* |
|
* Setup function called from init/main.c just after the banner |
|
* was printed. |
|
*/ |
|
|
|
void __init setup_arch(char **cmdline_p) |
|
{ |
|
/* |
|
* print what head.S has found out about the machine |
|
*/ |
|
if (MACHINE_IS_VM) |
|
pr_info("Linux is running as a z/VM " |
|
"guest operating system in 64-bit mode\n"); |
|
else if (MACHINE_IS_KVM) |
|
pr_info("Linux is running under KVM in 64-bit mode\n"); |
|
else if (MACHINE_IS_LPAR) |
|
pr_info("Linux is running natively in 64-bit mode\n"); |
|
else |
|
pr_info("Linux is running as a guest in 64-bit mode\n"); |
|
|
|
log_component_list(); |
|
|
|
/* Have one command line that is parsed and saved in /proc/cmdline */ |
|
/* boot_command_line has been already set up in early.c */ |
|
*cmdline_p = boot_command_line; |
|
|
|
ROOT_DEV = Root_RAM0; |
|
|
|
init_mm.start_code = (unsigned long) _text; |
|
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(); |
|
|
|
jump_label_init(); |
|
parse_early_param(); |
|
#ifdef CONFIG_CRASH_DUMP |
|
/* Deactivate elfcorehdr= kernel parameter */ |
|
elfcorehdr_addr = ELFCORE_ADDR_MAX; |
|
#endif |
|
|
|
os_info_init(); |
|
setup_ipl(); |
|
setup_task_size(); |
|
setup_control_program_code(); |
|
|
|
/* Do some memory reservations *before* memory is added to memblock */ |
|
reserve_above_ident_map(); |
|
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(); |
|
|
|
setup_uv(); |
|
setup_ident_map_size(); |
|
setup_memory(); |
|
dma_contiguous_reserve(ident_map_size); |
|
vmcp_cma_reserve(); |
|
if (MACHINE_HAS_EDAT2) |
|
hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); |
|
|
|
check_initrd(); |
|
reserve_crashkernel(); |
|
#ifdef CONFIG_CRASH_DUMP |
|
/* |
|
* Be aware that smp_save_dump_cpus() triggers a system reset. |
|
* Therefore CPU and device initialization should be done afterwards. |
|
*/ |
|
smp_save_dump_cpus(); |
|
#endif |
|
|
|
setup_resources(); |
|
setup_lowcore_dat_off(); |
|
smp_fill_possible_mask(); |
|
cpu_detect_mhz_feature(); |
|
cpu_init(); |
|
numa_setup(); |
|
smp_detect_cpus(); |
|
topology_init_early(); |
|
|
|
/* |
|
* Create kernel page tables and switch to virtual addressing. |
|
*/ |
|
paging_init(); |
|
|
|
/* |
|
* After paging_init created the kernel page table, the new PSWs |
|
* in lowcore can now run with DAT enabled. |
|
*/ |
|
setup_lowcore_dat_on(); |
|
|
|
/* Setup default console */ |
|
conmode_default(); |
|
set_preferred_console(); |
|
|
|
apply_alternative_instructions(); |
|
if (IS_ENABLED(CONFIG_EXPOLINE)) |
|
nospec_init_branches(); |
|
|
|
/* Setup zfcp/nvme dump support */ |
|
setup_zfcpdump(); |
|
|
|
/* Add system specific data to the random pool */ |
|
setup_randomness(); |
|
}
|
|
|