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1262 lines
32 KiB
1262 lines
32 KiB
// 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/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/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/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 <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/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/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/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/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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/* |
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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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/* |
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* Range of the BSS area. The size of the BSS area is determined |
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* at link time, with RESERVE_BRK*() facility reserving additional |
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* chunks. |
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*/ |
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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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/* |
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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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|
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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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|
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/* Common CPU data for all CPUs */ |
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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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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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#else |
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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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#endif |
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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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|
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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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/* |
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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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|
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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_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 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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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_data *data; |
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u64 pa_data; |
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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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memblock_reserve(pa_data, sizeof(*data) + data->len); |
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if (data->type == SETUP_INDIRECT && |
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((struct setup_indirect *)data->data)->type != SETUP_INDIRECT) |
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memblock_reserve(((struct setup_indirect *)data->data)->addr, |
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((struct setup_indirect *)data->data)->len); |
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pa_data = data->next; |
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early_memunmap(data, sizeof(*data)); |
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} |
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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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#ifdef CONFIG_KEXEC_CORE |
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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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/* |
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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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|
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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 |
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* make sure we allocate enough extra low memory so that we |
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* don't run out of DMA buffers for 32-bit devices. |
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*/ |
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low_size = max(swiotlb_size_or_default() + (8UL << 20), 256UL << 20); |
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} else { |
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/* passed with crashkernel=0,low ? */ |
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if (!low_size) |
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return 0; |
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} |
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|
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low_base = memblock_phys_alloc_range(low_size, CRASH_ALIGN, 0, CRASH_ADDR_LOW_MAX); |
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if (!low_base) { |
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pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n", |
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(unsigned long)(low_size >> 20)); |
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return -ENOMEM; |
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} |
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|
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pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (low RAM limit: %ldMB)\n", |
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(unsigned long)(low_size >> 20), |
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(unsigned long)(low_base >> 20), |
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(unsigned long)(low_mem_limit >> 20)); |
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|
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crashk_low_res.start = low_base; |
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crashk_low_res.end = low_base + low_size - 1; |
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insert_resource(&iomem_resource, &crashk_low_res); |
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#endif |
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return 0; |
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} |
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|
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static void __init reserve_crashkernel(void) |
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{ |
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unsigned long long crash_size, crash_base, total_mem; |
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bool high = false; |
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int ret; |
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|
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total_mem = memblock_phys_mem_size(); |
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|
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/* crashkernel=XM */ |
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ret = parse_crashkernel(boot_command_line, total_mem, &crash_size, &crash_base); |
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if (ret != 0 || crash_size <= 0) { |
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/* crashkernel=X,high */ |
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ret = parse_crashkernel_high(boot_command_line, total_mem, |
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&crash_size, &crash_base); |
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if (ret != 0 || crash_size <= 0) |
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return; |
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high = true; |
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} |
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|
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if (xen_pv_domain()) { |
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pr_info("Ignoring crashkernel for a Xen PV domain\n"); |
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return; |
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} |
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|
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/* 0 means: find the address automatically */ |
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if (!crash_base) { |
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/* |
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* Set CRASH_ADDR_LOW_MAX upper bound for crash memory, |
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* crashkernel=x,high reserves memory over 4G, also allocates |
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* 256M extra low memory for DMA buffers and swiotlb. |
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* But the extra memory is not required for all machines. |
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* So try low memory first and fall back to high memory |
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* unless "crashkernel=size[KMG],high" is specified. |
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*/ |
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if (!high) |
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crash_base = memblock_phys_alloc_range(crash_size, |
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CRASH_ALIGN, CRASH_ALIGN, |
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CRASH_ADDR_LOW_MAX); |
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if (!crash_base) |
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crash_base = memblock_phys_alloc_range(crash_size, |
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CRASH_ALIGN, CRASH_ALIGN, |
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CRASH_ADDR_HIGH_MAX); |
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if (!crash_base) { |
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pr_info("crashkernel reservation failed - No suitable area found.\n"); |
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return; |
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} |
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} else { |
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unsigned long long start; |
|
|
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start = memblock_phys_alloc_range(crash_size, SZ_1M, crash_base, |
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crash_base + crash_size); |
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if (start != crash_base) { |
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pr_info("crashkernel reservation failed - memory is in use.\n"); |
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return; |
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} |
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} |
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|
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if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) { |
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memblock_free(crash_base, crash_size); |
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return; |
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} |
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|
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pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n", |
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(unsigned long)(crash_size >> 20), |
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(unsigned long)(crash_base >> 20), |
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(unsigned long)(total_mem >> 20)); |
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|
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crashk_res.start = crash_base; |
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crashk_res.end = crash_base + crash_size - 1; |
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insert_resource(&iomem_resource, &crashk_res); |
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} |
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#else |
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static void __init reserve_crashkernel(void) |
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{ |
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} |
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#endif |
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|
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static struct resource standard_io_resources[] = { |
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{ .name = "dma1", .start = 0x00, .end = 0x1f, |
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.flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
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{ .name = "pic1", .start = 0x20, .end = 0x21, |
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.flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
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{ .name = "timer0", .start = 0x40, .end = 0x43, |
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.flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
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{ .name = "timer1", .start = 0x50, .end = 0x53, |
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.flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
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{ .name = "keyboard", .start = 0x60, .end = 0x60, |
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.flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
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{ .name = "keyboard", .start = 0x64, .end = 0x64, |
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.flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
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{ .name = "dma page reg", .start = 0x80, .end = 0x8f, |
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.flags = IORESOURCE_BUSY | IORESOURCE_IO }, |
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{ .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 __init void reserve_ibft_region(void) |
|
{ |
|
unsigned long addr, size = 0; |
|
|
|
addr = find_ibft_region(&size); |
|
|
|
if (size) |
|
memblock_reserve(addr, size); |
|
} |
|
|
|
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"); |
|
|
|
/* |
|
* Reserve all memory below the 1 MB mark that has not |
|
* already been reserved. |
|
*/ |
|
memblock_reserve(0, 1<<20); |
|
|
|
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]); |
|
} |
|
} |
|
|
|
/* |
|
* Here we put platform-specific memory range workarounds, i.e. |
|
* memory known to be corrupt or otherwise in need to be reserved on |
|
* specific platforms. |
|
* |
|
* If this gets used more widely it could use a real dispatch mechanism. |
|
*/ |
|
static void __init trim_platform_memory_ranges(void) |
|
{ |
|
trim_snb_memory(); |
|
} |
|
|
|
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 unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10; |
|
|
|
static int __init parse_reservelow(char *p) |
|
{ |
|
unsigned long long size; |
|
|
|
if (!p) |
|
return -EINVAL; |
|
|
|
size = memparse(p, &p); |
|
|
|
if (size < 4096) |
|
size = 4096; |
|
|
|
if (size > 640*1024) |
|
size = 640*1024; |
|
|
|
reserve_low = size; |
|
|
|
return 0; |
|
} |
|
|
|
early_param("reservelow", parse_reservelow); |
|
|
|
static void __init trim_low_memory_range(void) |
|
{ |
|
memblock_reserve(0, ALIGN(reserve_low, PAGE_SIZE)); |
|
} |
|
|
|
/* |
|
* 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; |
|
} |
|
|
|
/* |
|
* 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) |
|
{ |
|
/* |
|
* 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); |
|
|
|
/* |
|
* Make sure page 0 is always reserved because on systems with |
|
* L1TF its contents can be leaked to user processes. |
|
*/ |
|
memblock_reserve(0, PAGE_SIZE); |
|
|
|
early_reserve_initrd(); |
|
|
|
/* |
|
* At this point everything still needed from the boot loader |
|
* or BIOS or kernel text should be early reserved or marked not |
|
* RAM in e820. All other memory is free game. |
|
*/ |
|
|
|
#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(); |
|
arch_init_ideal_nops(); |
|
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(); |
|
|
|
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; |
|
init_mm.start_code = (unsigned long) _text; |
|
init_mm.end_code = (unsigned long) _etext; |
|
init_mm.end_data = (unsigned long) _edata; |
|
init_mm.brk = _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 |
|
strlcpy(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); |
|
strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); |
|
} |
|
#endif |
|
#endif |
|
|
|
strlcpy(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()). It may then be called |
|
* again from within noexec_setup() during parsing early parameters |
|
* to honor the respective command line option. |
|
*/ |
|
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(); |
|
|
|
/* after early param, so could get panic from serial */ |
|
memblock_x86_reserve_range_setup_data(); |
|
|
|
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(); |
|
|
|
dmi_setup(); |
|
|
|
/* |
|
* VMware detection requires dmi to be available, so this |
|
* needs to be done after dmi_setup(), for the boot CPU. |
|
*/ |
|
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 */ |
|
mtrr_bp_init(); |
|
if (mtrr_trim_uncached_memory(max_pfn)) |
|
max_pfn = e820__end_of_ram_pfn(); |
|
|
|
max_possible_pfn = max_pfn; |
|
|
|
/* |
|
* This call is required when the CPU does not support PAT. If |
|
* mtrr_bp_init() invoked it already via pat_init() the call has no |
|
* effect. |
|
*/ |
|
init_cache_modes(); |
|
|
|
/* |
|
* 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(); |
|
|
|
reserve_ibft_region(); |
|
|
|
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(); |
|
|
|
reserve_bios_regions(); |
|
|
|
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 |
|
|
|
reserve_real_mode(); |
|
|
|
trim_platform_memory_ranges(); |
|
trim_low_memory_range(); |
|
|
|
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(); |
|
|
|
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);
|
|
|