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setup.c
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setup.c
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/*
* Copyright (C) 1995 Linus Torvalds
*
* Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999
*
* Memory region support
* David Parsons <[email protected]>, July-August 1999
*
* Added E820 sanitization routine (removes overlapping memory regions);
* Brian Moyle <[email protected]>, February 2001
*
* Moved CPU detection code to cpu/${cpu}.c
* Patrick Mochel <[email protected]>, March 2002
*
* Provisions for empty E820 memory regions (reported by certain BIOSes).
* Alex Achenbach <[email protected]>, December 2002.
*
*/
/*
* This file handles the architecture-dependent parts of initialization
*/
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/screen_info.h>
#include <linux/ioport.h>
#include <linux/acpi.h>
#include <linux/sfi.h>
#include <linux/apm_bios.h>
#include <linux/initrd.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
#include <linux/seq_file.h>
#include <linux/console.h>
#include <linux/root_dev.h>
#include <linux/highmem.h>
#include <linux/export.h>
#include <linux/efi.h>
#include <linux/init.h>
#include <linux/edd.h>
#include <linux/iscsi_ibft.h>
#include <linux/nodemask.h>
#include <linux/kexec.h>
#include <linux/dmi.h>
#include <linux/pfn.h>
#include <linux/pci.h>
#include <asm/pci-direct.h>
#include <linux/init_ohci1394_dma.h>
#include <linux/kvm_para.h>
#include <linux/dma-contiguous.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/delay.h>
#include <linux/kallsyms.h>
#include <linux/cpufreq.h>
#include <linux/dma-mapping.h>
#include <linux/ctype.h>
#include <linux/uaccess.h>
#include <linux/percpu.h>
#include <linux/crash_dump.h>
#include <linux/tboot.h>
#include <linux/jiffies.h>
#include <linux/usb/xhci-dbgp.h>
#include <video/edid.h>
#include <asm/mtrr.h>
#include <asm/apic.h>
#include <asm/realmode.h>
#include <asm/e820/api.h>
#include <asm/mpspec.h>
#include <asm/setup.h>
#include <asm/efi.h>
#include <asm/timer.h>
#include <asm/i8259.h>
#include <asm/sections.h>
#include <asm/io_apic.h>
#include <asm/ist.h>
#include <asm/setup_arch.h>
#include <asm/bios_ebda.h>
#include <asm/cacheflush.h>
#include <asm/processor.h>
#include <asm/bugs.h>
#include <asm/kasan.h>
#include <asm/vsyscall.h>
#include <asm/cpu.h>
#include <asm/desc.h>
#include <asm/dma.h>
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/mmu_context.h>
#include <asm/proto.h>
#include <asm/paravirt.h>
#include <asm/hypervisor.h>
#include <asm/olpc_ofw.h>
#include <asm/percpu.h>
#include <asm/topology.h>
#include <asm/apicdef.h>
#include <asm/amd_nb.h>
#include <asm/mce.h>
#include <asm/alternative.h>
#include <asm/prom.h>
#include <asm/microcode.h>
#include <asm/mmu_context.h>
#include <asm/kaslr.h>
/*
* max_low_pfn_mapped: highest direct mapped pfn under 4GB
* max_pfn_mapped: highest direct mapped pfn over 4GB
*
* The direct mapping only covers E820_TYPE_RAM regions, so the ranges and gaps are
* represented by pfn_mapped
*/
unsigned long max_low_pfn_mapped;
unsigned long max_pfn_mapped;
#ifdef CONFIG_DMI
RESERVE_BRK(dmi_alloc, 65536);
#endif
static __initdata unsigned long _brk_start = (unsigned long)__brk_base;
unsigned long _brk_end = (unsigned long)__brk_base;
#ifdef CONFIG_X86_64
int default_cpu_present_to_apicid(int mps_cpu)
{
return __default_cpu_present_to_apicid(mps_cpu);
}
int default_check_phys_apicid_present(int phys_apicid)
{
return __default_check_phys_apicid_present(phys_apicid);
}
#endif
struct boot_params boot_params;
/*
* Machine setup..
*/
static struct resource data_resource = {
.name = "Kernel data",
.start = 0,
.end = 0,
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
};
static struct resource code_resource = {
.name = "Kernel code",
.start = 0,
.end = 0,
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
};
static struct resource bss_resource = {
.name = "Kernel bss",
.start = 0,
.end = 0,
.flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM
};
#ifdef CONFIG_X86_32
/* cpu data as detected by the assembly code in head_32.S */
struct cpuinfo_x86 new_cpu_data;
/* common cpu data for all cpus */
struct cpuinfo_x86 boot_cpu_data __read_mostly;
EXPORT_SYMBOL(boot_cpu_data);
unsigned int def_to_bigsmp;
/* for MCA, but anyone else can use it if they want */
unsigned int machine_id;
unsigned int machine_submodel_id;
unsigned int BIOS_revision;
struct apm_info apm_info;
EXPORT_SYMBOL(apm_info);
#if defined(CONFIG_X86_SPEEDSTEP_SMI) || \
defined(CONFIG_X86_SPEEDSTEP_SMI_MODULE)
struct ist_info ist_info;
EXPORT_SYMBOL(ist_info);
#else
struct ist_info ist_info;
#endif
#else
struct cpuinfo_x86 boot_cpu_data __read_mostly = {
.x86_phys_bits = MAX_PHYSMEM_BITS,
};
EXPORT_SYMBOL(boot_cpu_data);
#endif
#if !defined(CONFIG_X86_PAE) || defined(CONFIG_X86_64)
__visible unsigned long mmu_cr4_features __ro_after_init;
#else
__visible unsigned long mmu_cr4_features __ro_after_init = X86_CR4_PAE;
#endif
/* Boot loader ID and version as integers, for the benefit of proc_dointvec */
int bootloader_type, bootloader_version;
/*
* Setup options
*/
struct screen_info screen_info;
EXPORT_SYMBOL(screen_info);
struct edid_info edid_info;
EXPORT_SYMBOL_GPL(edid_info);
extern int root_mountflags;
unsigned long saved_video_mode;
#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
#define RAMDISK_LOAD_FLAG 0x4000
static char __initdata command_line[COMMAND_LINE_SIZE];
#ifdef CONFIG_CMDLINE_BOOL
static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
#endif
#if defined(CONFIG_EDD) || defined(CONFIG_EDD_MODULE)
struct edd edd;
#ifdef CONFIG_EDD_MODULE
EXPORT_SYMBOL(edd);
#endif
/**
* copy_edd() - Copy the BIOS EDD information
* from boot_params into a safe place.
*
*/
static inline void __init copy_edd(void)
{
memcpy(edd.mbr_signature, boot_params.edd_mbr_sig_buffer,
sizeof(edd.mbr_signature));
memcpy(edd.edd_info, boot_params.eddbuf, sizeof(edd.edd_info));
edd.mbr_signature_nr = boot_params.edd_mbr_sig_buf_entries;
edd.edd_info_nr = boot_params.eddbuf_entries;
}
#else
static inline void __init copy_edd(void)
{
}
#endif
void * __init extend_brk(size_t size, size_t align)
{
size_t mask = align - 1;
void *ret;
BUG_ON(_brk_start == 0);
BUG_ON(align & mask);
_brk_end = (_brk_end + mask) & ~mask;
BUG_ON((char *)(_brk_end + size) > __brk_limit);
ret = (void *)_brk_end;
_brk_end += size;
memset(ret, 0, size);
return ret;
}
#ifdef CONFIG_X86_32
static void __init cleanup_highmap(void)
{
}
#endif
static void __init reserve_brk(void)
{
if (_brk_end > _brk_start)
memblock_reserve(__pa_symbol(_brk_start),
_brk_end - _brk_start);
/* Mark brk area as locked down and no longer taking any
new allocations */
_brk_start = 0;
}
u64 relocated_ramdisk;
#ifdef CONFIG_BLK_DEV_INITRD
static u64 __init get_ramdisk_image(void)
{
u64 ramdisk_image = boot_params.hdr.ramdisk_image;
ramdisk_image |= (u64)boot_params.ext_ramdisk_image << 32;
return ramdisk_image;
}
static u64 __init get_ramdisk_size(void)
{
u64 ramdisk_size = boot_params.hdr.ramdisk_size;
ramdisk_size |= (u64)boot_params.ext_ramdisk_size << 32;
return ramdisk_size;
}
static void __init relocate_initrd(void)
{
/* Assume only end is not page aligned */
u64 ramdisk_image = get_ramdisk_image();
u64 ramdisk_size = get_ramdisk_size();
u64 area_size = PAGE_ALIGN(ramdisk_size);
/* We need to move the initrd down into directly mapped mem */
relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
area_size, PAGE_SIZE);
if (!relocated_ramdisk)
panic("Cannot find place for new RAMDISK of size %lld\n",
ramdisk_size);
/* Note: this includes all the mem currently occupied by
the initrd, we rely on that fact to keep the data intact. */
memblock_reserve(relocated_ramdisk, area_size);
initrd_start = relocated_ramdisk + PAGE_OFFSET;
initrd_end = initrd_start + ramdisk_size;
printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
copy_from_early_mem((void *)initrd_start, ramdisk_image, ramdisk_size);
printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
" [mem %#010llx-%#010llx]\n",
ramdisk_image, ramdisk_image + ramdisk_size - 1,
relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
}
static void __init early_reserve_initrd(void)
{
/* Assume only end is not page aligned */
u64 ramdisk_image = get_ramdisk_image();
u64 ramdisk_size = get_ramdisk_size();
u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
if (!boot_params.hdr.type_of_loader ||
!ramdisk_image || !ramdisk_size)
return; /* No initrd provided by bootloader */
memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
}
static void __init reserve_initrd(void)
{
/* Assume only end is not page aligned */
u64 ramdisk_image = get_ramdisk_image();
u64 ramdisk_size = get_ramdisk_size();
u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
u64 mapped_size;
if (!boot_params.hdr.type_of_loader ||
!ramdisk_image || !ramdisk_size)
return; /* No initrd provided by bootloader */
initrd_start = 0;
mapped_size = memblock_mem_size(max_pfn_mapped);
if (ramdisk_size >= (mapped_size>>1))
panic("initrd too large to handle, "
"disabling initrd (%lld needed, %lld available)\n",
ramdisk_size, mapped_size>>1);
printk(KERN_INFO "RAMDISK: [mem %#010llx-%#010llx]\n", ramdisk_image,
ramdisk_end - 1);
if (pfn_range_is_mapped(PFN_DOWN(ramdisk_image),
PFN_DOWN(ramdisk_end))) {
/* All are mapped, easy case */
initrd_start = ramdisk_image + PAGE_OFFSET;
initrd_end = initrd_start + ramdisk_size;
return;
}
relocate_initrd();
memblock_free(ramdisk_image, ramdisk_end - ramdisk_image);
}
#else
static void __init early_reserve_initrd(void)
{
}
static void __init reserve_initrd(void)
{
}
#endif /* CONFIG_BLK_DEV_INITRD */
static void __init parse_setup_data(void)
{
struct setup_data *data;
u64 pa_data, pa_next;
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
u32 data_len, data_type;
data = early_memremap(pa_data, sizeof(*data));
data_len = data->len + sizeof(struct setup_data);
data_type = data->type;
pa_next = data->next;
early_memunmap(data, sizeof(*data));
switch (data_type) {
case SETUP_E820_EXT:
e820__memory_setup_extended(pa_data, data_len);
break;
case SETUP_DTB:
add_dtb(pa_data);
break;
case SETUP_EFI:
parse_efi_setup(pa_data, data_len);
break;
default:
break;
}
pa_data = pa_next;
}
}
static void __init memblock_x86_reserve_range_setup_data(void)
{
struct setup_data *data;
u64 pa_data;
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
data = early_memremap(pa_data, sizeof(*data));
memblock_reserve(pa_data, sizeof(*data) + data->len);
pa_data = data->next;
early_memunmap(data, sizeof(*data));
}
}
/*
* --------- Crashkernel reservation ------------------------------
*/
#ifdef CONFIG_KEXEC_CORE
/* 16M alignment for crash kernel regions */
#define CRASH_ALIGN (16 << 20)
/*
* Keep the crash kernel below this limit. On 32 bits earlier kernels
* would limit the kernel to the low 512 MiB due to mapping restrictions.
* On 64bit, old kexec-tools need to under 896MiB.
*/
#ifdef CONFIG_X86_32
# define CRASH_ADDR_LOW_MAX (512 << 20)
# define CRASH_ADDR_HIGH_MAX (512 << 20)
#else
# define CRASH_ADDR_LOW_MAX (896UL << 20)
# define CRASH_ADDR_HIGH_MAX MAXMEM
#endif
static int __init reserve_crashkernel_low(void)
{
#ifdef CONFIG_X86_64
unsigned long long base, low_base = 0, low_size = 0;
unsigned long total_low_mem;
int ret;
total_low_mem = memblock_mem_size(1UL << (32 - PAGE_SHIFT));
/* crashkernel=Y,low */
ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
if (ret) {
/*
* two parts from lib/swiotlb.c:
* -swiotlb size: user-specified with swiotlb= or default.
*
* -swiotlb overflow buffer: now hardcoded to 32k. We round it
* 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_find_in_range(0, 1ULL << 32, low_size, CRASH_ALIGN);
if (!low_base) {
pr_err("Cannot reserve %ldMB crashkernel low memory, please try smaller size.\n",
(unsigned long)(low_size >> 20));
return -ENOMEM;
}
ret = memblock_reserve(low_base, low_size);
if (ret) {
pr_err("%s: Error reserving crashkernel low memblock.\n", __func__);
return ret;
}
pr_info("Reserving %ldMB of low memory at %ldMB for crashkernel (System low RAM: %ldMB)\n",
(unsigned long)(low_size >> 20),
(unsigned long)(low_base >> 20),
(unsigned long)(total_low_mem >> 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;
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;
}
/* 0 means: find the address automatically */
if (crash_base <= 0) {
/*
* Set CRASH_ADDR_LOW_MAX upper bound for crash memory,
* as old kexec-tools loads bzImage below that, unless
* "crashkernel=size[KMG],high" is specified.
*/
crash_base = memblock_find_in_range(CRASH_ALIGN,
high ? CRASH_ADDR_HIGH_MAX
: CRASH_ADDR_LOW_MAX,
crash_size, CRASH_ALIGN);
if (!crash_base) {
pr_info("crashkernel reservation failed - No suitable area found.\n");
return;
}
} else {
unsigned long long start;
start = memblock_find_in_range(crash_base,
crash_base + crash_size,
crash_size, 1 << 20);
if (start != crash_base) {
pr_info("crashkernel reservation failed - memory is in use.\n");
return;
}
}
ret = memblock_reserve(crash_base, crash_size);
if (ret) {
pr_err("%s: Error reserving crashkernel memblock.\n", __func__);
return;
}
if (crash_base >= (1ULL << 32) && reserve_crashkernel_low()) {
memblock_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);
}
#else
static void __init reserve_crashkernel(void)
{
}
#endif
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 __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 BIOSen report the PC BIOS
* area (640->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;
}
static void __init simple_udelay_calibration(void)
{
unsigned int tsc_khz, cpu_khz;
unsigned long lpj;
if (!boot_cpu_has(X86_FEATURE_TSC))
return;
cpu_khz = x86_platform.calibrate_cpu();
tsc_khz = x86_platform.calibrate_tsc();
tsc_khz = tsc_khz ? : cpu_khz;
if (!tsc_khz)
return;
lpj = tsc_khz * 1000;
do_div(lpj, HZ);
loops_per_jiffy = lpj;
}
/*
* 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)
{
memblock_reserve(__pa_symbol(_text),
(unsigned long)__bss_stop - (unsigned long)_text);
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);
#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();
early_trap_init();
early_cpu_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;
rd_prompt = ((boot_params.hdr.ram_size & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((boot_params.hdr.ram_size & RAMDISK_LOAD_FLAG) != 0);
#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);
}
if (efi_enabled(EFI_BOOT))
efi_memblock_x86_reserve_range();
#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;
mpx_mm_init(&init_mm);
code_resource.start = __pa_symbol(_text);
code_resource.end = __pa_symbol(_etext)-1;
data_resource.start = __pa_symbol(_etext);
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();
#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