1351 lines
35 KiB
C
1351 lines
35 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 1995 Linus Torvalds
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*
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* This file contains the setup_arch() code, which handles the architecture-dependent
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* parts of early kernel initialization.
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*/
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#include <linux/acpi.h>
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#include <linux/console.h>
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#include <linux/crash_dump.h>
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#include <linux/dma-map-ops.h>
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#include <linux/dmi.h>
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#include <linux/efi.h>
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#include <linux/ima.h>
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#include <linux/init_ohci1394_dma.h>
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#include <linux/initrd.h>
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#include <linux/iscsi_ibft.h>
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#include <linux/memblock.h>
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#include <linux/panic_notifier.h>
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#include <linux/pci.h>
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#include <linux/root_dev.h>
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#include <linux/hugetlb.h>
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#include <linux/tboot.h>
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#include <linux/usb/xhci-dbgp.h>
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#include <linux/static_call.h>
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#include <linux/swiotlb.h>
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#include <linux/random.h>
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#include <uapi/linux/mount.h>
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#include <xen/xen.h>
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#include <asm/apic.h>
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#include <asm/efi.h>
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#include <asm/numa.h>
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#include <asm/bios_ebda.h>
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#include <asm/bugs.h>
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#include <asm/cacheinfo.h>
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#include <asm/cpu.h>
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#include <asm/efi.h>
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#include <asm/gart.h>
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#include <asm/hypervisor.h>
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#include <asm/io_apic.h>
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#include <asm/kasan.h>
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#include <asm/kaslr.h>
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#include <asm/mce.h>
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#include <asm/memtype.h>
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#include <asm/mtrr.h>
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#include <asm/realmode.h>
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#include <asm/olpc_ofw.h>
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#include <asm/pci-direct.h>
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#include <asm/prom.h>
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#include <asm/proto.h>
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#include <asm/thermal.h>
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#include <asm/unwind.h>
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#include <asm/vsyscall.h>
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#include <linux/vmalloc.h>
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/*
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* max_low_pfn_mapped: highest directly mapped pfn < 4 GB
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* max_pfn_mapped: highest directly mapped pfn > 4 GB
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*
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* The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
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* represented by pfn_mapped[].
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*/
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unsigned long max_low_pfn_mapped;
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unsigned long max_pfn_mapped;
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#ifdef CONFIG_DMI
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RESERVE_BRK(dmi_alloc, 65536);
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#endif
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unsigned long _brk_start = (unsigned long)__brk_base;
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unsigned long _brk_end = (unsigned long)__brk_base;
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struct boot_params boot_params;
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/*
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* These are the four main kernel memory regions, we put them into
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* the resource tree so that kdump tools and other debugging tools
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* recover it:
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*/
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static struct resource rodata_resource = {
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.name = "Kernel rodata",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
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};
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static struct resource data_resource = {
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.name = "Kernel data",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
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};
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static struct resource code_resource = {
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.name = "Kernel code",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
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};
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static struct resource bss_resource = {
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.name = "Kernel bss",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
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};
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#ifdef CONFIG_X86_32
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/* CPU data as detected by the assembly code in head_32.S */
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struct cpuinfo_x86 new_cpu_data;
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unsigned int def_to_bigsmp;
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struct apm_info apm_info;
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EXPORT_SYMBOL(apm_info);
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#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
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defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
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struct ist_info ist_info;
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EXPORT_SYMBOL(ist_info);
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#else
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struct ist_info ist_info;
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#endif
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#endif
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struct cpuinfo_x86 boot_cpu_data __read_mostly;
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EXPORT_SYMBOL(boot_cpu_data);
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#if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
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__visible unsigned long mmu_cr4_features __ro_after_init;
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#else
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__visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
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#endif
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#ifdef CONFIG_IMA
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static phys_addr_t ima_kexec_buffer_phys;
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static size_t ima_kexec_buffer_size;
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#endif
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/* Boot loader ID and version as integers, for the benefit of proc_dointvec */
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int bootloader_type, bootloader_version;
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/*
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* Setup options
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*/
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struct screen_info screen_info;
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EXPORT_SYMBOL(screen_info);
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struct edid_info edid_info;
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EXPORT_SYMBOL_GPL(edid_info);
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extern int root_mountflags;
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unsigned long saved_video_mode;
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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static char __initdata command_line[COMMAND_LINE_SIZE];
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#ifdef CONFIG_CMDLINE_BOOL
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static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
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#endif
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#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
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struct edd edd;
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#ifdef CONFIG_EDD_MODULE
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EXPORT_SYMBOL(edd);
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#endif
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/**
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* copy_edd() - Copy the BIOS EDD information
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* from boot_params into a safe place.
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*
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*/
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static inline void __init copy_edd(void)
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{
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memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
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sizeof(edd.mbr_signature));
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memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
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edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
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edd.edd_info_nr = boot_params.eddbuf_entries;
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}
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#else
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static inline void __init copy_edd(void)
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{
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}
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#endif
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void * __init extend_brk(size_t size, size_t align)
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{
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size_t mask = align - 1;
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void *ret;
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BUG_ON(_brk_start == 0);
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BUG_ON(align & mask);
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_brk_end = (_brk_end + mask) & ~mask;
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BUG_ON((char *)(_brk_end + size) > __brk_limit);
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ret = (void *)_brk_end;
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_brk_end += size;
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memset(ret, 0, size);
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return ret;
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}
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#ifdef CONFIG_X86_32
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static void __init cleanup_highmap(void)
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{
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}
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#endif
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static void __init reserve_brk(void)
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{
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if (_brk_end > _brk_start)
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memblock_reserve(__pa_symbol(_brk_start),
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_brk_end - _brk_start);
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/* Mark brk area as locked down and no longer taking any
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new allocations */
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_brk_start = 0;
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}
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u64 relocated_ramdisk;
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#ifdef CONFIG_BLK_DEV_INITRD
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static u64 __init get_ramdisk_image(void)
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{
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u64 ramdisk_image = boot_params.hdr.ramdisk_image;
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ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
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if (ramdisk_image == 0)
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ramdisk_image = phys_initrd_start;
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return ramdisk_image;
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}
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static u64 __init get_ramdisk_size(void)
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{
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u64 ramdisk_size = boot_params.hdr.ramdisk_size;
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ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
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if (ramdisk_size == 0)
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ramdisk_size = phys_initrd_size;
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return ramdisk_size;
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}
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static void __init relocate_initrd(void)
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{
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/* Assume only end is not page aligned */
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u64 ramdisk_image = get_ramdisk_image();
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u64 ramdisk_size = get_ramdisk_size();
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u64 area_size = PAGE_ALIGN(ramdisk_size);
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/* We need to move the initrd down into directly mapped mem */
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relocated_ramdisk = memblock_phys_alloc_range(area_size, PAGE_SIZE, 0,
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PFN_PHYS(max_pfn_mapped));
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if (!relocated_ramdisk)
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panic("Cannot find place for new RAMDISK of size %lld\n",
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ramdisk_size);
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initrd_start = relocated_ramdisk + PAGE_OFFSET;
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initrd_end = initrd_start + ramdisk_size;
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printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
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relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
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copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
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printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
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" [mem %#010llx-%#010llx]\n",
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ramdisk_image, ramdisk_image + ramdisk_size - 1,
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relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
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}
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static void __init early_reserve_initrd(void)
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{
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/* Assume only end is not page aligned */
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u64 ramdisk_image = get_ramdisk_image();
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u64 ramdisk_size = get_ramdisk_size();
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u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
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if (!boot_params.hdr.type_of_loader ||
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!ramdisk_image || !ramdisk_size)
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return; /* No initrd provided by bootloader */
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memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
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}
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static void __init reserve_initrd(void)
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{
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/* Assume only end is not page aligned */
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u64 ramdisk_image = get_ramdisk_image();
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u64 ramdisk_size = get_ramdisk_size();
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u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
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if (!boot_params.hdr.type_of_loader ||
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!ramdisk_image || !ramdisk_size)
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return; /* No initrd provided by bootloader */
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initrd_start = 0;
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printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
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ramdisk_end - 1);
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if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
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PFN_DOWN(ramdisk_end))) {
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/* All are mapped, easy case */
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initrd_start = ramdisk_image + PAGE_OFFSET;
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initrd_end = initrd_start + ramdisk_size;
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return;
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}
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relocate_initrd();
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memblock_phys_free(ramdisk_image, ramdisk_end - ramdisk_image);
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}
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#else
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static void __init early_reserve_initrd(void)
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{
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}
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static void __init reserve_initrd(void)
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{
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}
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#endif /* CONFIG_BLK_DEV_INITRD */
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static void __init add_early_ima_buffer(u64 phys_addr)
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{
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#ifdef CONFIG_IMA
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struct ima_setup_data *data;
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data = early_memremap(phys_addr + sizeof(struct setup_data), sizeof(*data));
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if (!data) {
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pr_warn("setup: failed to memremap ima_setup_data entry\n");
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return;
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}
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if (data->size) {
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memblock_reserve(data->addr, data->size);
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ima_kexec_buffer_phys = data->addr;
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ima_kexec_buffer_size = data->size;
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}
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early_memunmap(data, sizeof(*data));
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#else
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pr_warn("Passed IMA kexec data, but CONFIG_IMA not set. Ignoring.\n");
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#endif
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}
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#if defined(CONFIG_HAVE_IMA_KEXEC) && !defined(CONFIG_OF_FLATTREE)
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int __init ima_free_kexec_buffer(void)
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{
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int rc;
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if (!ima_kexec_buffer_size)
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return -ENOENT;
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rc = memblock_phys_free(ima_kexec_buffer_phys,
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ima_kexec_buffer_size);
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if (rc)
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return rc;
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ima_kexec_buffer_phys = 0;
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ima_kexec_buffer_size = 0;
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return 0;
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}
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int __init ima_get_kexec_buffer(void **addr, size_t *size)
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{
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if (!ima_kexec_buffer_size)
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return -ENOENT;
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*addr = __va(ima_kexec_buffer_phys);
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*size = ima_kexec_buffer_size;
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return 0;
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}
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#endif
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static void __init parse_setup_data(void)
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{
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struct setup_data *data;
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u64 pa_data, pa_next;
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pa_data = boot_params.hdr.setup_data;
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while (pa_data) {
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u32 data_len, data_type;
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data = early_memremap(pa_data, sizeof(*data));
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data_len = data->len + sizeof(struct setup_data);
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data_type = data->type;
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pa_next = data->next;
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early_memunmap(data, sizeof(*data));
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switch (data_type) {
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case SETUP_E820_EXT:
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e820__memory_setup_extended(pa_data, data_len);
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break;
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case SETUP_DTB:
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add_dtb(pa_data);
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break;
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case SETUP_EFI:
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parse_efi_setup(pa_data, data_len);
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break;
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case SETUP_IMA:
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add_early_ima_buffer(pa_data);
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break;
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case SETUP_RNG_SEED:
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data = early_memremap(pa_data, data_len);
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add_bootloader_randomness(data->data, data->len);
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/* Zero seed for forward secrecy. */
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memzero_explicit(data->data, data->len);
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/* Zero length in case we find ourselves back here by accident. */
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memzero_explicit(&data->len, sizeof(data->len));
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early_memunmap(data, data_len);
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break;
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default:
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break;
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}
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pa_data = pa_next;
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}
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}
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static void __init memblock_x86_reserve_range_setup_data(void)
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{
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struct setup_indirect *indirect;
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struct setup_data *data;
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u64 pa_data, pa_next;
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u32 len;
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pa_data = boot_params.hdr.setup_data;
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while (pa_data) {
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data = early_memremap(pa_data, sizeof(*data));
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if (!data) {
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pr_warn("setup: failed to memremap setup_data entry\n");
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return;
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}
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len = sizeof(*data);
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pa_next = data->next;
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memblock_reserve(pa_data, sizeof(*data) + data->len);
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if (data->type == SETUP_INDIRECT) {
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len += data->len;
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early_memunmap(data, sizeof(*data));
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data = early_memremap(pa_data, len);
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if (!data) {
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pr_warn("setup: failed to memremap indirect setup_data\n");
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return;
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}
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indirect = (struct setup_indirect *)data->data;
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if (indirect->type != SETUP_INDIRECT)
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memblock_reserve(indirect->addr, indirect->len);
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}
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pa_data = pa_next;
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early_memunmap(data, len);
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}
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}
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/*
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* --------- Crashkernel reservation ------------------------------
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*/
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/* 16M alignment for crash kernel regions */
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#define CRASH_ALIGN SZ_16M
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/*
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* Keep the crash kernel below this limit.
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*
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* Earlier 32-bits kernels would limit the kernel to the low 512 MB range
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* due to mapping restrictions.
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*
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* 64-bit kdump kernels need to be restricted to be under 64 TB, which is
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* the upper limit of system RAM in 4-level paging mode. Since the kdump
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* jump could be from 5-level paging to 4-level paging, the jump will fail if
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* the kernel is put above 64 TB, and during the 1st kernel bootup there's
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* no good way to detect the paging mode of the target kernel which will be
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* loaded for dumping.
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*/
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#ifdef CONFIG_X86_32
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# define CRASH_ADDR_LOW_MAX SZ_512M
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# define CRASH_ADDR_HIGH_MAX SZ_512M
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#else
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# define CRASH_ADDR_LOW_MAX SZ_4G
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# define CRASH_ADDR_HIGH_MAX SZ_64T
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#endif
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static int __init reserve_crashkernel_low(void)
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{
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#ifdef CONFIG_X86_64
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unsigned long long base, low_base = 0, low_size = 0;
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unsigned long low_mem_limit;
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int ret;
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low_mem_limit = min(memblock_phys_mem_size(), CRASH_ADDR_LOW_MAX);
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/* crashkernel=Y,low */
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ret = parse_crashkernel_low(boot_command_line, low_mem_limit, &low_size, &base);
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if (ret) {
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/*
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* two parts from kernel/dma/swiotlb.c:
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* -swiotlb size: user-specified with swiotlb= or default.
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*
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* -swiotlb overflow buffer: now hardcoded to 32k. We round it
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* to 8M for other buffers that may need to stay low too. Also
|
|
* make sure we allocate enough extra low memory so that we
|
|
* don't run out of DMA buffers for 32-bit devices.
|
|
*/
|
|
low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20);
|
|
} else {
|
|
/* passed with crashkernel=0,low ? */
|
|
if (!low_size)
|
|
return 0;
|
|
}
|
|
|
|
low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX);
|
|
if (!low_base) {
|
|
pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
|
|
(unsigned long)(low_size >> 20));
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (low RAM limit: %ldMB)\n",
|
|
(unsigned long)(low_size >> 20),
|
|
(unsigned long)(low_base >> 20),
|
|
(unsigned long)(low_mem_limit >> 20));
|
|
|
|
crashk_low_res.start = low_base;
|
|
crashk_low_res.end = low_base + low_size - 1;
|
|
insert_resource(&iomem_resource, &crashk_low_res);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static void __init reserve_crashkernel(void)
|
|
{
|
|
unsigned long long crash_size, crash_base, total_mem;
|
|
bool high = false;
|
|
int ret;
|
|
|
|
if (!IS_ENABLED(CONFIG_KEXEC_CORE))
|
|
return;
|
|
|
|
total_mem = memblock_phys_mem_size();
|
|
|
|
/* crashkernel=XM */
|
|
ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base);
|
|
if (ret != 0 || crash_size <= 0) {
|
|
/* crashkernel=X,high */
|
|
ret = parse_crashkernel_high(boot_command_line, total_mem,
|
|
&crash_size, &crash_base);
|
|
if (ret != 0 || crash_size <= 0)
|
|
return;
|
|
high = true;
|
|
}
|
|
|
|
if (xen_pv_domain()) {
|
|
pr_info("Ignoring crashkernel for a Xen PV domain\n");
|
|
return;
|
|
}
|
|
|
|
/* 0 means: find the address automatically */
|
|
if (!crash_base) {
|
|
/*
|
|
* Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
|
|
* crashkernel=x,high reserves memory over 4G, also allocates
|
|
* 256M extra low memory for DMA buffers and swiotlb.
|
|
* But the extra memory is not required for all machines.
|
|
* So try low memory first and fall back to high memory
|
|
* unless "crashkernel=size[KMG],high" is specified.
|
|
*/
|
|
if (!high)
|
|
crash_base = memblock_phys_alloc_range(crash_size,
|
|
CRASH_ALIGN, CRASH_ALIGN,
|
|
CRASH_ADDR_LOW_MAX);
|
|
if (!crash_base)
|
|
crash_base = memblock_phys_alloc_range(crash_size,
|
|
CRASH_ALIGN, CRASH_ALIGN,
|
|
CRASH_ADDR_HIGH_MAX);
|
|
if (!crash_base) {
|
|
pr_info("crashkernel reservation failed - No suitable area found.\n");
|
|
return;
|
|
}
|
|
} else {
|
|
unsigned long long start;
|
|
|
|
start = memblock_phys_alloc_range(crash_size, SZ_1M, crash_base,
|
|
crash_base + crash_size);
|
|
if (start != crash_base) {
|
|
pr_info("crashkernel reservation failed - memory is in use.\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
|
|
memblock_phys_free(crash_base, crash_size);
|
|
return;
|
|
}
|
|
|
|
pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
|
|
(unsigned long)(crash_size >> 20),
|
|
(unsigned long)(crash_base >> 20),
|
|
(unsigned long)(total_mem >> 20));
|
|
|
|
crashk_res.start = crash_base;
|
|
crashk_res.end = crash_base + crash_size - 1;
|
|
insert_resource(&iomem_resource, &crashk_res);
|
|
}
|
|
|
|
static struct resource standard_io_resources[] = {
|
|
{ .name = "dma1", .start = 0x00, .end = 0x1f,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "pic1", .start = 0x20, .end = 0x21,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "timer0", .start = 0x40, .end = 0x43,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "timer1", .start = 0x50, .end = 0x53,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "keyboard", .start = 0x60, .end = 0x60,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "keyboard", .start = 0x64, .end = 0x64,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "dma page reg", .start = 0x80, .end = 0x8f,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "pic2", .start = 0xa0, .end = 0xa1,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "dma2", .start = 0xc0, .end = 0xdf,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO },
|
|
{ .name = "fpu", .start = 0xf0, .end = 0xff,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_IO }
|
|
};
|
|
|
|
void __init reserve_standard_io_resources(void)
|
|
{
|
|
int i;
|
|
|
|
/* request I/O space for devices used on all i[345]86 PCs */
|
|
for (i = 0; i < ARRAY_SIZE(standard_io_resources); i++)
|
|
request_resource(&ioport_resource, &standard_io_resources[i]);
|
|
|
|
}
|
|
|
|
static bool __init snb_gfx_workaround_needed(void)
|
|
{
|
|
#ifdef CONFIG_PCI
|
|
int i;
|
|
u16 vendor, devid;
|
|
static const __initconst u16 snb_ids[] = {
|
|
0x0102,
|
|
0x0112,
|
|
0x0122,
|
|
0x0106,
|
|
0x0116,
|
|
0x0126,
|
|
0x010a,
|
|
};
|
|
|
|
/* Assume no if something weird is going on with PCI */
|
|
if (!early_pci_allowed())
|
|
return false;
|
|
|
|
vendor = read_pci_config_16(0, 2, 0, PCI_VENDOR_ID);
|
|
if (vendor != 0x8086)
|
|
return false;
|
|
|
|
devid = read_pci_config_16(0, 2, 0, PCI_DEVICE_ID);
|
|
for (i = 0; i < ARRAY_SIZE(snb_ids); i++)
|
|
if (devid == snb_ids[i])
|
|
return true;
|
|
#endif
|
|
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Sandy Bridge graphics has trouble with certain ranges, exclude
|
|
* them from allocation.
|
|
*/
|
|
static void __init trim_snb_memory(void)
|
|
{
|
|
static const __initconst unsigned long bad_pages[] = {
|
|
0x20050000,
|
|
0x20110000,
|
|
0x20130000,
|
|
0x20138000,
|
|
0x40004000,
|
|
};
|
|
int i;
|
|
|
|
if (!snb_gfx_workaround_needed())
|
|
return;
|
|
|
|
printk(KERN_DEBUG "reserving inaccessible SNB gfx pages\n");
|
|
|
|
/*
|
|
* SandyBridge integrated graphics devices have a bug that prevents
|
|
* them from accessing certain memory ranges, namely anything below
|
|
* 1M and in the pages listed in bad_pages[] above.
|
|
*
|
|
* To avoid these pages being ever accessed by SNB gfx devices reserve
|
|
* bad_pages that have not already been reserved at boot time.
|
|
* All memory below the 1 MB mark is anyway reserved later during
|
|
* setup_arch(), so there is no need to reserve it here.
|
|
*/
|
|
|
|
for (i = 0; i < ARRAY_SIZE(bad_pages); i++) {
|
|
if (memblock_reserve(bad_pages[i], PAGE_SIZE))
|
|
printk(KERN_WARNING "failed to reserve 0x%08lx\n",
|
|
bad_pages[i]);
|
|
}
|
|
}
|
|
|
|
static void __init trim_bios_range(void)
|
|
{
|
|
/*
|
|
* A special case is the first 4Kb of memory;
|
|
* This is a BIOS owned area, not kernel ram, but generally
|
|
* not listed as such in the E820 table.
|
|
*
|
|
* This typically reserves additional memory (64KiB by default)
|
|
* since some BIOSes are known to corrupt low memory. See the
|
|
* Kconfig help text for X86_RESERVE_LOW.
|
|
*/
|
|
e820__range_update(0, PAGE_SIZE, E820_TYPE_RAM, E820_TYPE_RESERVED);
|
|
|
|
/*
|
|
* special case: Some BIOSes report the PC BIOS
|
|
* area (640Kb -> 1Mb) as RAM even though it is not.
|
|
* take them out.
|
|
*/
|
|
e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM, 1);
|
|
|
|
e820__update_table(e820_table);
|
|
}
|
|
|
|
/* called before trim_bios_range() to spare extra sanitize */
|
|
static void __init e820_add_kernel_range(void)
|
|
{
|
|
u64 start = __pa_symbol(_text);
|
|
u64 size = __pa_symbol(_end) - start;
|
|
|
|
/*
|
|
* Complain if .text .data and .bss are not marked as E820_TYPE_RAM and
|
|
* attempt to fix it by adding the range. We may have a confused BIOS,
|
|
* or the user may have used memmap=exactmap or memmap=xxM$yyM to
|
|
* exclude kernel range. If we really are running on top non-RAM,
|
|
* we will crash later anyways.
|
|
*/
|
|
if (e820__mapped_all(start, start + size, E820_TYPE_RAM))
|
|
return;
|
|
|
|
pr_warn(".text .data .bss are not marked as E820_TYPE_RAM!\n");
|
|
e820__range_remove(start, size, E820_TYPE_RAM, 0);
|
|
e820__range_add(start, size, E820_TYPE_RAM);
|
|
}
|
|
|
|
static void __init early_reserve_memory(void)
|
|
{
|
|
/*
|
|
* Reserve the memory occupied by the kernel between _text and
|
|
* __end_of_kernel_reserve symbols. Any kernel sections after the
|
|
* __end_of_kernel_reserve symbol must be explicitly reserved with a
|
|
* separate memblock_reserve() or they will be discarded.
|
|
*/
|
|
memblock_reserve(__pa_symbol(_text),
|
|
(unsigned long)__end_of_kernel_reserve - (unsigned long)_text);
|
|
|
|
/*
|
|
* The first 4Kb of memory is a BIOS owned area, but generally it is
|
|
* not listed as such in the E820 table.
|
|
*
|
|
* Reserve the first 64K of memory since some BIOSes are known to
|
|
* corrupt low memory. After the real mode trampoline is allocated the
|
|
* rest of the memory below 640k is reserved.
|
|
*
|
|
* In addition, make sure page 0 is always reserved because on
|
|
* systems with L1TF its contents can be leaked to user processes.
|
|
*/
|
|
memblock_reserve(0, SZ_64K);
|
|
|
|
early_reserve_initrd();
|
|
|
|
memblock_x86_reserve_range_setup_data();
|
|
|
|
reserve_bios_regions();
|
|
trim_snb_memory();
|
|
}
|
|
|
|
/*
|
|
* Dump out kernel offset information on panic.
|
|
*/
|
|
static int
|
|
dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
|
|
{
|
|
if (kaslr_enabled()) {
|
|
pr_emerg("Kernel Offset: 0x%lx from 0x%lx (relocation range: 0x%lx-0x%lx)\n",
|
|
kaslr_offset(),
|
|
__START_KERNEL,
|
|
__START_KERNEL_map,
|
|
MODULES_VADDR-1);
|
|
} else {
|
|
pr_emerg("Kernel Offset: disabled\n");
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void x86_configure_nx(void)
|
|
{
|
|
if (boot_cpu_has(X86_FEATURE_NX))
|
|
__supported_pte_mask |= _PAGE_NX;
|
|
else
|
|
__supported_pte_mask &= ~_PAGE_NX;
|
|
}
|
|
|
|
static void __init x86_report_nx(void)
|
|
{
|
|
if (!boot_cpu_has(X86_FEATURE_NX)) {
|
|
printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
|
|
"missing in CPU!\n");
|
|
} else {
|
|
#if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
|
|
printk(KERN_INFO "NX (Execute Disable) protection: active\n");
|
|
#else
|
|
/* 32bit non-PAE kernel, NX cannot be used */
|
|
printk(KERN_NOTICE "Notice: NX (Execute Disable) protection "
|
|
"cannot be enabled: non-PAE kernel!\n");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Determine if we were loaded by an EFI loader. If so, then we have also been
|
|
* passed the efi memmap, systab, etc., so we should use these data structures
|
|
* for initialization. Note, the efi init code path is determined by the
|
|
* global efi_enabled. This allows the same kernel image to be used on existing
|
|
* systems (with a traditional BIOS) as well as on EFI systems.
|
|
*/
|
|
/*
|
|
* setup_arch - architecture-specific boot-time initializations
|
|
*
|
|
* Note: On x86_64, fixmaps are ready for use even before this is called.
|
|
*/
|
|
|
|
void __init setup_arch(char **cmdline_p)
|
|
{
|
|
#ifdef CONFIG_X86_32
|
|
memcpy(&boot_cpu_data, &new_cpu_data, sizeof(new_cpu_data));
|
|
|
|
/*
|
|
* copy kernel address range established so far and switch
|
|
* to the proper swapper page table
|
|
*/
|
|
clone_pgd_range(swapper_pg_dir + KERNEL_PGD_BOUNDARY,
|
|
initial_page_table + KERNEL_PGD_BOUNDARY,
|
|
KERNEL_PGD_PTRS);
|
|
|
|
load_cr3(swapper_pg_dir);
|
|
/*
|
|
* Note: Quark X1000 CPUs advertise PGE incorrectly and require
|
|
* a cr3 based tlb flush, so the following __flush_tlb_all()
|
|
* will not flush anything because the CPU quirk which clears
|
|
* X86_FEATURE_PGE has not been invoked yet. Though due to the
|
|
* load_cr3() above the TLB has been flushed already. The
|
|
* quirk is invoked before subsequent calls to __flush_tlb_all()
|
|
* so proper operation is guaranteed.
|
|
*/
|
|
__flush_tlb_all();
|
|
#else
|
|
printk(KERN_INFO "Command line: %s\n", boot_command_line);
|
|
boot_cpu_data.x86_phys_bits = MAX_PHYSMEM_BITS;
|
|
#endif
|
|
|
|
/*
|
|
* If we have OLPC OFW, we might end up relocating the fixmap due to
|
|
* reserve_top(), so do this before touching the ioremap area.
|
|
*/
|
|
olpc_ofw_detect();
|
|
|
|
idt_setup_early_traps();
|
|
early_cpu_init();
|
|
jump_label_init();
|
|
static_call_init();
|
|
early_ioremap_init();
|
|
|
|
setup_olpc_ofw_pgd();
|
|
|
|
ROOT_DEV = old_decode_dev(boot_params.hdr.root_dev);
|
|
screen_info = boot_params.screen_info;
|
|
edid_info = boot_params.edid_info;
|
|
#ifdef CONFIG_X86_32
|
|
apm_info.bios = boot_params.apm_bios_info;
|
|
ist_info = boot_params.ist_info;
|
|
#endif
|
|
saved_video_mode = boot_params.hdr.vid_mode;
|
|
bootloader_type = boot_params.hdr.type_of_loader;
|
|
if ((bootloader_type >> 4) == 0xe) {
|
|
bootloader_type &= 0xf;
|
|
bootloader_type |= (boot_params.hdr.ext_loader_type+0x10) << 4;
|
|
}
|
|
bootloader_version = bootloader_type & 0xf;
|
|
bootloader_version |= boot_params.hdr.ext_loader_ver << 4;
|
|
|
|
#ifdef CONFIG_BLK_DEV_RAM
|
|
rd_image_start = boot_params.hdr.ram_size & RAMDISK_IMAGE_START_MASK;
|
|
#endif
|
|
#ifdef CONFIG_EFI
|
|
if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
|
|
EFI32_LOADER_SIGNATURE, 4)) {
|
|
set_bit(EFI_BOOT, &efi.flags);
|
|
} else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
|
|
EFI64_LOADER_SIGNATURE, 4)) {
|
|
set_bit(EFI_BOOT, &efi.flags);
|
|
set_bit(EFI_64BIT, &efi.flags);
|
|
}
|
|
#endif
|
|
|
|
x86_init.oem.arch_setup();
|
|
|
|
/*
|
|
* Do some memory reservations *before* memory is added to memblock, so
|
|
* memblock allocations won't overwrite it.
|
|
*
|
|
* After this point, everything still needed from the boot loader or
|
|
* firmware or kernel text should be early reserved or marked not RAM in
|
|
* e820. All other memory is free game.
|
|
*
|
|
* This call needs to happen before e820__memory_setup() which calls the
|
|
* xen_memory_setup() on Xen dom0 which relies on the fact that those
|
|
* early reservations have happened already.
|
|
*/
|
|
early_reserve_memory();
|
|
|
|
iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
|
|
e820__memory_setup();
|
|
parse_setup_data();
|
|
|
|
copy_edd();
|
|
|
|
if (!boot_params.hdr.root_flags)
|
|
root_mountflags &= ~MS_RDONLY;
|
|
setup_initial_init_mm(_text, _etext, _edata, (void *)_brk_end);
|
|
|
|
code_resource.start = __pa_symbol(_text);
|
|
code_resource.end = __pa_symbol(_etext)-1;
|
|
rodata_resource.start = __pa_symbol(__start_rodata);
|
|
rodata_resource.end = __pa_symbol(__end_rodata)-1;
|
|
data_resource.start = __pa_symbol(_sdata);
|
|
data_resource.end = __pa_symbol(_edata)-1;
|
|
bss_resource.start = __pa_symbol(__bss_start);
|
|
bss_resource.end = __pa_symbol(__bss_stop)-1;
|
|
|
|
#ifdef CONFIG_CMDLINE_BOOL
|
|
#ifdef CONFIG_CMDLINE_OVERRIDE
|
|
strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
|
|
#else
|
|
if (builtin_cmdline[0]) {
|
|
/* append boot loader cmdline to builtin */
|
|
strlcat(builtin_cmdline, " ", COMMAND_LINE_SIZE);
|
|
strlcat(builtin_cmdline, boot_command_line, COMMAND_LINE_SIZE);
|
|
strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
|
|
*cmdline_p = command_line;
|
|
|
|
/*
|
|
* x86_configure_nx() is called before parse_early_param() to detect
|
|
* whether hardware doesn't support NX (so that the early EHCI debug
|
|
* console setup can safely call set_fixmap()).
|
|
*/
|
|
x86_configure_nx();
|
|
|
|
parse_early_param();
|
|
|
|
if (efi_enabled(EFI_BOOT))
|
|
efi_memblock_x86_reserve_range();
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
/*
|
|
* Memory used by the kernel cannot be hot-removed because Linux
|
|
* cannot migrate the kernel pages. When memory hotplug is
|
|
* enabled, we should prevent memblock from allocating memory
|
|
* for the kernel.
|
|
*
|
|
* ACPI SRAT records all hotpluggable memory ranges. But before
|
|
* SRAT is parsed, we don't know about it.
|
|
*
|
|
* The kernel image is loaded into memory at very early time. We
|
|
* cannot prevent this anyway. So on NUMA system, we set any
|
|
* node the kernel resides in as un-hotpluggable.
|
|
*
|
|
* Since on modern servers, one node could have double-digit
|
|
* gigabytes memory, we can assume the memory around the kernel
|
|
* image is also un-hotpluggable. So before SRAT is parsed, just
|
|
* allocate memory near the kernel image to try the best to keep
|
|
* the kernel away from hotpluggable memory.
|
|
*/
|
|
if (movable_node_is_enabled())
|
|
memblock_set_bottom_up(true);
|
|
#endif
|
|
|
|
x86_report_nx();
|
|
|
|
if (acpi_mps_check()) {
|
|
#ifdef CONFIG_X86_LOCAL_APIC
|
|
disable_apic = 1;
|
|
#endif
|
|
setup_clear_cpu_cap(X86_FEATURE_APIC);
|
|
}
|
|
|
|
e820__reserve_setup_data();
|
|
e820__finish_early_params();
|
|
|
|
if (efi_enabled(EFI_BOOT))
|
|
efi_init();
|
|
|
|
reserve_ibft_region();
|
|
dmi_setup();
|
|
|
|
/*
|
|
* VMware detection requires dmi to be available, so this
|
|
* needs to be done after dmi_setup(), for the boot CPU.
|
|
* For some guest types (Xen PV, SEV-SNP, TDX) it is required to be
|
|
* called before cache_bp_init() for setting up MTRR state.
|
|
*/
|
|
init_hypervisor_platform();
|
|
|
|
tsc_early_init();
|
|
x86_init.resources.probe_roms();
|
|
|
|
/* after parse_early_param, so could debug it */
|
|
insert_resource(&iomem_resource, &code_resource);
|
|
insert_resource(&iomem_resource, &rodata_resource);
|
|
insert_resource(&iomem_resource, &data_resource);
|
|
insert_resource(&iomem_resource, &bss_resource);
|
|
|
|
e820_add_kernel_range();
|
|
trim_bios_range();
|
|
#ifdef CONFIG_X86_32
|
|
if (ppro_with_ram_bug()) {
|
|
e820__range_update(0x70000000ULL, 0x40000ULL, E820_TYPE_RAM,
|
|
E820_TYPE_RESERVED);
|
|
e820__update_table(e820_table);
|
|
printk(KERN_INFO "fixed physical RAM map:\n");
|
|
e820__print_table("bad_ppro");
|
|
}
|
|
#else
|
|
early_gart_iommu_check();
|
|
#endif
|
|
|
|
/*
|
|
* partially used pages are not usable - thus
|
|
* we are rounding upwards:
|
|
*/
|
|
max_pfn = e820__end_of_ram_pfn();
|
|
|
|
/* update e820 for memory not covered by WB MTRRs */
|
|
cache_bp_init();
|
|
if (mtrr_trim_uncached_memory(max_pfn))
|
|
max_pfn = e820__end_of_ram_pfn();
|
|
|
|
max_possible_pfn = max_pfn;
|
|
|
|
/*
|
|
* Define random base addresses for memory sections after max_pfn is
|
|
* defined and before each memory section base is used.
|
|
*/
|
|
kernel_randomize_memory();
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* max_low_pfn get updated here */
|
|
find_low_pfn_range();
|
|
#else
|
|
check_x2apic();
|
|
|
|
/* How many end-of-memory variables you have, grandma! */
|
|
/* need this before calling reserve_initrd */
|
|
if (max_pfn > (1UL<<(32 - PAGE_SHIFT)))
|
|
max_low_pfn = e820__end_of_low_ram_pfn();
|
|
else
|
|
max_low_pfn = max_pfn;
|
|
|
|
high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
|
|
#endif
|
|
|
|
/*
|
|
* Find and reserve possible boot-time SMP configuration:
|
|
*/
|
|
find_smp_config();
|
|
|
|
early_alloc_pgt_buf();
|
|
|
|
/*
|
|
* Need to conclude brk, before e820__memblock_setup()
|
|
* it could use memblock_find_in_range, could overlap with
|
|
* brk area.
|
|
*/
|
|
reserve_brk();
|
|
|
|
cleanup_highmap();
|
|
|
|
memblock_set_current_limit(ISA_END_ADDRESS);
|
|
e820__memblock_setup();
|
|
|
|
/*
|
|
* Needs to run after memblock setup because it needs the physical
|
|
* memory size.
|
|
*/
|
|
sev_setup_arch();
|
|
|
|
efi_fake_memmap();
|
|
efi_find_mirror();
|
|
efi_esrt_init();
|
|
efi_mokvar_table_init();
|
|
|
|
/*
|
|
* The EFI specification says that boot service code won't be
|
|
* called after ExitBootServices(). This is, in fact, a lie.
|
|
*/
|
|
efi_reserve_boot_services();
|
|
|
|
/* preallocate 4k for mptable mpc */
|
|
e820__memblock_alloc_reserved_mpc_new();
|
|
|
|
#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
|
|
setup_bios_corruption_check();
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_32
|
|
printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
|
|
(max_pfn_mapped<<PAGE_SHIFT) - 1);
|
|
#endif
|
|
|
|
/*
|
|
* Find free memory for the real mode trampoline and place it there. If
|
|
* there is not enough free memory under 1M, on EFI-enabled systems
|
|
* there will be additional attempt to reclaim the memory for the real
|
|
* mode trampoline at efi_free_boot_services().
|
|
*
|
|
* Unconditionally reserve the entire first 1M of RAM because BIOSes
|
|
* are known to corrupt low memory and several hundred kilobytes are not
|
|
* worth complex detection what memory gets clobbered. Windows does the
|
|
* same thing for very similar reasons.
|
|
*
|
|
* Moreover, on machines with SandyBridge graphics or in setups that use
|
|
* crashkernel the entire 1M is reserved anyway.
|
|
*/
|
|
x86_platform.realmode_reserve();
|
|
|
|
init_mem_mapping();
|
|
|
|
idt_setup_early_pf();
|
|
|
|
/*
|
|
* Update mmu_cr4_features (and, indirectly, trampoline_cr4_features)
|
|
* with the current CR4 value. This may not be necessary, but
|
|
* auditing all the early-boot CR4 manipulation would be needed to
|
|
* rule it out.
|
|
*
|
|
* Mask off features that don't work outside long mode (just
|
|
* PCIDE for now).
|
|
*/
|
|
mmu_cr4_features = __read_cr4() & ~X86_CR4_PCIDE;
|
|
|
|
memblock_set_current_limit(get_max_mapped());
|
|
|
|
/*
|
|
* NOTE: On x86-32, only from this point on, fixmaps are ready for use.
|
|
*/
|
|
|
|
#ifdef CONFIG_PROVIDE_OHCI1394_DMA_INIT
|
|
if (init_ohci1394_dma_early)
|
|
init_ohci1394_dma_on_all_controllers();
|
|
#endif
|
|
/* Allocate bigger log buffer */
|
|
setup_log_buf(1);
|
|
|
|
if (efi_enabled(EFI_BOOT)) {
|
|
switch (boot_params.secure_boot) {
|
|
case efi_secureboot_mode_disabled:
|
|
pr_info("Secure boot disabled\n");
|
|
break;
|
|
case efi_secureboot_mode_enabled:
|
|
pr_info("Secure boot enabled\n");
|
|
break;
|
|
default:
|
|
pr_info("Secure boot could not be determined\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
reserve_initrd();
|
|
|
|
acpi_table_upgrade();
|
|
/* Look for ACPI tables and reserve memory occupied by them. */
|
|
acpi_boot_table_init();
|
|
|
|
vsmp_init();
|
|
|
|
io_delay_init();
|
|
|
|
early_platform_quirks();
|
|
|
|
early_acpi_boot_init();
|
|
|
|
initmem_init();
|
|
dma_contiguous_reserve(max_pfn_mapped << PAGE_SHIFT);
|
|
|
|
if (boot_cpu_has(X86_FEATURE_GBPAGES))
|
|
hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
|
|
|
|
/*
|
|
* Reserve memory for crash kernel after SRAT is parsed so that it
|
|
* won't consume hotpluggable memory.
|
|
*/
|
|
reserve_crashkernel();
|
|
|
|
memblock_find_dma_reserve();
|
|
|
|
if (!early_xdbc_setup_hardware())
|
|
early_xdbc_register_console();
|
|
|
|
x86_init.paging.pagetable_init();
|
|
|
|
kasan_init();
|
|
|
|
/*
|
|
* Sync back kernel address range.
|
|
*
|
|
* FIXME: Can the later sync in setup_cpu_entry_areas() replace
|
|
* this call?
|
|
*/
|
|
sync_initial_page_table();
|
|
|
|
tboot_probe();
|
|
|
|
map_vsyscall();
|
|
|
|
generic_apic_probe();
|
|
|
|
early_quirks();
|
|
|
|
/*
|
|
* Read APIC and some other early information from ACPI tables.
|
|
*/
|
|
acpi_boot_init();
|
|
x86_dtb_init();
|
|
|
|
/*
|
|
* get boot-time SMP configuration:
|
|
*/
|
|
get_smp_config();
|
|
|
|
/*
|
|
* Systems w/o ACPI and mptables might not have it mapped the local
|
|
* APIC yet, but prefill_possible_map() might need to access it.
|
|
*/
|
|
init_apic_mappings();
|
|
|
|
prefill_possible_map();
|
|
|
|
init_cpu_to_node();
|
|
init_gi_nodes();
|
|
|
|
io_apic_init_mappings();
|
|
|
|
x86_init.hyper.guest_late_init();
|
|
|
|
e820__reserve_resources();
|
|
e820__register_nosave_regions(max_pfn);
|
|
|
|
x86_init.resources.reserve_resources();
|
|
|
|
e820__setup_pci_gap();
|
|
|
|
#ifdef CONFIG_VT
|
|
#if defined(CONFIG_VGA_CONSOLE)
|
|
if (!efi_enabled(EFI_BOOT) || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
|
|
conswitchp = &vga_con;
|
|
#endif
|
|
#endif
|
|
x86_init.oem.banner();
|
|
|
|
x86_init.timers.wallclock_init();
|
|
|
|
/*
|
|
* This needs to run before setup_local_APIC() which soft-disables the
|
|
* local APIC temporarily and that masks the thermal LVT interrupt,
|
|
* leading to softlockups on machines which have configured SMI
|
|
* interrupt delivery.
|
|
*/
|
|
therm_lvt_init();
|
|
|
|
mcheck_init();
|
|
|
|
register_refined_jiffies(CLOCK_TICK_RATE);
|
|
|
|
#ifdef CONFIG_EFI
|
|
if (efi_enabled(EFI_BOOT))
|
|
efi_apply_memmap_quirks();
|
|
#endif
|
|
|
|
unwind_init();
|
|
}
|
|
|
|
#ifdef CONFIG_X86_32
|
|
|
|
static struct resource video_ram_resource = {
|
|
.name = "Video RAM area",
|
|
.start = 0xa0000,
|
|
.end = 0xbffff,
|
|
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
|
|
};
|
|
|
|
void __init i386_reserve_resources(void)
|
|
{
|
|
request_resource(&iomem_resource, &video_ram_resource);
|
|
reserve_standard_io_resources();
|
|
}
|
|
|
|
#endif /* CONFIG_X86_32 */
|
|
|
|
static struct notifier_block kernel_offset_notifier = {
|
|
.notifier_call = dump_kernel_offset
|
|
};
|
|
|
|
static int __init register_kernel_offset_dumper(void)
|
|
{
|
|
atomic_notifier_chain_register(&panic_notifier_list,
|
|
&kernel_offset_notifier);
|
|
return 0;
|
|
}
|
|
__initcall(register_kernel_offset_dumper);
|