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linux-sg2042/arch/x86/kernel/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 <orc@pell.chi.il.us>, July-August 1999
*
* Added E820 sanitization routine (removes overlapping memory regions);
* Brian Moyle <bmoyle@mvista.com>, February 2001
*
* Moved CPU detection code to cpu/${cpu}.c
* Patrick Mochel <mochel@osdl.org>, March 2002
*
* Provisions for empty E820 memory regions (reported by certain BIOSes).
* Alex Achenbach <xela@slit.de>, 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/module.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 <video/edid.h>
#include <asm/mtrr.h>
#include <asm/apic.h>
#include <asm/realmode.h>
#include <asm/e820.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/dmi.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/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>
/*
* 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_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
#ifndef CONFIG_DEBUG_BOOT_PARAMS
struct boot_params __initdata boot_params;
#else
struct boot_params boot_params;
#endif
/*
* Machine setup..
*/
static struct resource data_resource = {
.name = "Kernel data",
.start = 0,
.end = 0,
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
static struct resource code_resource = {
.name = "Kernel code",
.start = 0,
.end = 0,
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
static struct resource bss_resource = {
.name = "Kernel bss",
.start = 0,
.end = 0,
.flags = IORESOURCE_BUSY | IORESOURCE_MEM
};
#ifdef CONFIG_X86_32
/* cpu data as detected by the assembly code in head.S */
struct cpuinfo_x86 new_cpu_data __cpuinitdata = {0, 0, 0, 0, -1, 1, 0, 0, -1};
/* common cpu data for all cpus */
struct cpuinfo_x86 boot_cpu_data __read_mostly = {0, 0, 0, 0, -1, 1, 0, 0, -1};
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)
unsigned long mmu_cr4_features;
#else
unsigned long mmu_cr4_features = 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(_brk_start),
__pa(_brk_end) - __pa(_brk_start));
/* Mark brk area as locked down and no longer taking any
new allocations */
_brk_start = 0;
}
#ifdef CONFIG_BLK_DEV_INITRD
#define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
static void __init relocate_initrd(void)
{
/* Assume only end is not page aligned */
u64 ramdisk_image = boot_params.hdr.ramdisk_image;
u64 ramdisk_size = boot_params.hdr.ramdisk_size;
u64 area_size = PAGE_ALIGN(ramdisk_size);
u64 ramdisk_here;
unsigned long slop, clen, mapaddr;
char *p, *q;
/* We need to move the initrd down into directly mapped mem */
ramdisk_here = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
area_size, PAGE_SIZE);
if (!ramdisk_here)
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(ramdisk_here, area_size);
initrd_start = ramdisk_here + PAGE_OFFSET;
initrd_end = initrd_start + ramdisk_size;
printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
ramdisk_here, ramdisk_here + ramdisk_size - 1);
q = (char *)initrd_start;
/* Copy the initrd */
while (ramdisk_size) {
slop = ramdisk_image & ~PAGE_MASK;
clen = ramdisk_size;
if (clen > MAX_MAP_CHUNK-slop)
clen = MAX_MAP_CHUNK-slop;
mapaddr = ramdisk_image & PAGE_MASK;
p = early_memremap(mapaddr, clen+slop);
memcpy(q, p+slop, clen);
early_iounmap(p, clen+slop);
q += clen;
ramdisk_image += clen;
ramdisk_size -= clen;
}
ramdisk_image = boot_params.hdr.ramdisk_image;
ramdisk_size = boot_params.hdr.ramdisk_size;
printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
" [mem %#010llx-%#010llx]\n",
ramdisk_image, ramdisk_image + ramdisk_size - 1,
ramdisk_here, ramdisk_here + ramdisk_size - 1);
}
static u64 __init get_mem_size(unsigned long limit_pfn)
{
int i;
u64 mapped_pages = 0;
unsigned long start_pfn, end_pfn;
for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL) {
start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
mapped_pages += end_pfn - start_pfn;
}
return mapped_pages << PAGE_SHIFT;
}
static void __init reserve_initrd(void)
{
/* Assume only end is not page aligned */
u64 ramdisk_image = boot_params.hdr.ramdisk_image;
u64 ramdisk_size = boot_params.hdr.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 = get_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 */
/*
* don't need to reserve again, already reserved early
* in i386_start_kernel
*/
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 reserve_initrd(void)
{
}
#endif /* CONFIG_BLK_DEV_INITRD */
static void __init parse_setup_data(void)
{
struct setup_data *data;
u64 pa_data;
if (boot_params.hdr.version < 0x0209)
return;
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
u32 data_len, map_len;
map_len = max(PAGE_SIZE - (pa_data & ~PAGE_MASK),
(u64)sizeof(struct setup_data));
data = early_memremap(pa_data, map_len);
data_len = data->len + sizeof(struct setup_data);
if (data_len > map_len) {
early_iounmap(data, map_len);
data = early_memremap(pa_data, data_len);
map_len = data_len;
}
switch (data->type) {
case SETUP_E820_EXT:
parse_e820_ext(data);
break;
case SETUP_DTB:
add_dtb(pa_data);
break;
default:
break;
}
pa_data = data->next;
early_iounmap(data, map_len);
}
}
static void __init e820_reserve_setup_data(void)
{
struct setup_data *data;
u64 pa_data;
int found = 0;
if (boot_params.hdr.version < 0x0209)
return;
pa_data = boot_params.hdr.setup_data;
while (pa_data) {
data = early_memremap(pa_data, sizeof(*data));
e820_update_range(pa_data, sizeof(*data)+data->len,
E820_RAM, E820_RESERVED_KERN);
found = 1;
pa_data = data->next;
early_iounmap(data, sizeof(*data));
}
if (!found)
return;
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
memcpy(&e820_saved, &e820, sizeof(struct e820map));
printk(KERN_INFO "extended physical RAM map:\n");
e820_print_map("reserve setup_data");
}
static void __init memblock_x86_reserve_range_setup_data(void)
{
struct setup_data *data;
u64 pa_data;
if (boot_params.hdr.version < 0x0209)
return;
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_iounmap(data, sizeof(*data));
}
}
/*
* --------- Crashkernel reservation ------------------------------
*/
#ifdef CONFIG_KEXEC
/*
* 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 64 bits, kexec-tools currently limits us to 896 MiB; increase this
* limit once kexec-tools are fixed.
*/
#ifdef CONFIG_X86_32
# define CRASH_KERNEL_ADDR_MAX (512 << 20)
#else
# define CRASH_KERNEL_ADDR_MAX (896 << 20)
#endif
static void __init reserve_crashkernel(void)
{
unsigned long long total_mem;
unsigned long long crash_size, crash_base;
int ret;
total_mem = memblock_phys_mem_size();
ret = parse_crashkernel(boot_command_line, total_mem,
&crash_size, &crash_base);
if (ret != 0 || crash_size <= 0)
return;
/* 0 means: find the address automatically */
if (crash_base <= 0) {
const unsigned long long alignment = 16<<20; /* 16M */
/*
* kexec want bzImage is below CRASH_KERNEL_ADDR_MAX
*/
crash_base = memblock_find_in_range(alignment,
CRASH_KERNEL_ADDR_MAX, crash_size, alignment);
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;
}
}
memblock_reserve(crash_base, crash_size);
printk(KERN_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 unsigned reserve_low = CONFIG_X86_RESERVE_LOW << 10;
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_update_range(0, ALIGN(reserve_low, PAGE_SIZE),
E820_RAM, E820_RESERVED);
/*
* special case: Some BIOSen report the PC BIOS
* area (640->1Mb) as ram even though it is not.
* take them out.
*/
e820_remove_range(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_RAM, 1);
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
}
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);
/*
* 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));
visws_early_detect();
/*
* 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);
__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;
if (boot_params.sys_desc_table.length != 0) {
machine_id = boot_params.sys_desc_table.table[0];
machine_submodel_id = boot_params.sys_desc_table.table[1];
BIOS_revision = boot_params.sys_desc_table.table[2];
}
#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,
"EL32", 4)) {
efi_enabled = 1;
efi_64bit = false;
} else if (!strncmp((char *)&boot_params.efi_info.efi_loader_signature,
"EL64", 4)) {
efi_enabled = 1;
efi_64bit = true;
}
if (efi_enabled && efi_memblock_x86_reserve_range())
efi_enabled = 0;
#endif
x86_init.oem.arch_setup();
iomem_resource.end = (1ULL << boot_cpu_data.x86_phys_bits) - 1;
setup_memory_map();
parse_setup_data();
/* update the e820_saved too */
e820_reserve_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 = virt_to_phys(_text);
code_resource.end = virt_to_phys(_etext)-1;
data_resource.start = virt_to_phys(_etext);
data_resource.end = virt_to_phys(_edata)-1;
bss_resource.start = virt_to_phys(&__bss_start);
bss_resource.end = virt_to_phys(&__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();
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);
}
#ifdef CONFIG_PCI
if (pci_early_dump_regs)
early_dump_pci_devices();
#endif
finish_e820_parsing();
if (efi_enabled)
efi_init();
dmi_scan_machine();
/*
* VMware detection requires dmi to be available, so this
* needs to be done after dmi_scan_machine, for the BP.
*/
init_hypervisor_platform();
x86_init.resources.probe_roms();
/* after parse_early_param, so could debug it */
insert_resource(&iomem_resource, &code_resource);
insert_resource(&iomem_resource, &data_resource);
insert_resource(&iomem_resource, &bss_resource);
/*
* Complain if .text .data and .bss are not marked as E820_RAM and
* attempt to fix it by adding the range. We may have a confused BIOS,
* or the user may have incorrectly supplied it via memmap=exactmap. If
* we really are running on top non-RAM, we will crash later anyways.
*/
if (!e820_all_mapped(code_resource.start, __pa(__brk_limit), E820_RAM)) {
pr_warn(".text .data .bss are not marked as E820_RAM!\n");
e820_add_region(code_resource.start,
__pa(__brk_limit) - code_resource.start + 1,
E820_RAM);
}
trim_bios_range();
#ifdef CONFIG_X86_32
if (ppro_with_ram_bug()) {
e820_update_range(0x70000000ULL, 0x40000ULL, E820_RAM,
E820_RESERVED);
sanitize_e820_map(e820.map, ARRAY_SIZE(e820.map), &e820.nr_map);
printk(KERN_INFO "fixed physical RAM map:\n");
e820_print_map("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();
#ifdef CONFIG_X86_32
/* max_low_pfn get updated here */
find_low_pfn_range();
#else
num_physpages = max_pfn;
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 memblock_x86_fill()
* it could use memblock_find_in_range, could overlap with
* brk area.
*/
reserve_brk();
cleanup_highmap();
memblock.current_limit = ISA_END_ADDRESS;
memblock_x86_fill();
/*
* The EFI specification says that boot service code won't be called
* after ExitBootServices(). This is, in fact, a lie.
*/
if (efi_enabled)
efi_reserve_boot_services();
/* preallocate 4k for mptable mpc */
early_reserve_e820_mpc_new();
#ifdef CONFIG_X86_CHECK_BIOS_CORRUPTION
setup_bios_corruption_check();
#endif
printk(KERN_DEBUG "initial memory mapped: [mem 0x00000000-%#010lx]\n",
(max_pfn_mapped<<PAGE_SHIFT) - 1);
setup_real_mode();
init_mem_mapping();
memblock.current_limit = get_max_mapped();
dma_contiguous_reserve(0);
/*
* 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);
reserve_initrd();
reserve_crashkernel();
vsmp_init();
io_delay_init();
/*
* Parse the ACPI tables for possible boot-time SMP configuration.
*/
acpi_boot_table_init();
early_acpi_boot_init();
initmem_init();
memblock_find_dma_reserve();
#ifdef CONFIG_KVM_GUEST
kvmclock_init();
#endif
x86_init.paging.pagetable_init();
if (boot_cpu_data.cpuid_level >= 0) {
/* A CPU has %cr4 if and only if it has CPUID */
mmu_cr4_features = read_cr4();
if (trampoline_cr4_features)
*trampoline_cr4_features = mmu_cr4_features;
}
#ifdef CONFIG_X86_32
/* sync back kernel address range */
clone_pgd_range(initial_page_table + KERNEL_PGD_BOUNDARY,
swapper_pg_dir + KERNEL_PGD_BOUNDARY,
KERNEL_PGD_PTRS);
#endif
tboot_probe();
#ifdef CONFIG_X86_64
map_vsyscall();
#endif
generic_apic_probe();
early_quirks();
/*
* Read APIC and some other early information from ACPI tables.
*/
acpi_boot_init();
sfi_init();
x86_dtb_init();
/*
* get boot-time SMP configuration:
*/
if (smp_found_config)
get_smp_config();
prefill_possible_map();
init_cpu_to_node();
init_apic_mappings();
if (x86_io_apic_ops.init)
x86_io_apic_ops.init();
kvm_guest_init();
e820_reserve_resources();
e820_mark_nosave_regions(max_low_pfn);
x86_init.resources.reserve_resources();
e820_setup_gap();
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
if (!efi_enabled || (efi_mem_type(0xa0000) != EFI_CONVENTIONAL_MEMORY))
conswitchp = &vga_con;
#elif defined(CONFIG_DUMMY_CONSOLE)
conswitchp = &dummy_con;
#endif
#endif
x86_init.oem.banner();
x86_init.timers.wallclock_init();
mcheck_init();
arch_init_ideal_nops();
register_refined_jiffies(CLOCK_TICK_RATE);
#ifdef CONFIG_EFI
/* Once setup is done above, disable efi_enabled on mismatched
* firmware/kernel archtectures since there is no support for
* runtime services.
*/
if (efi_enabled && IS_ENABLED(CONFIG_X86_64) != efi_64bit) {
pr_info("efi: Setup done, disabling due to 32/64-bit mismatch\n");
efi_unmap_memmap();
efi_enabled = 0;
}
#endif
}
#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 */
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