void setup_arch(void) {
setup_memory_map();
finish_e820_parsing();
max_pfn = e820_end_of_ram_pfn();
/* preallocate 4k for mptable mpc */
/*
early_reserve_e820_mpc_new();
*/
/* 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_low_pfn get updated here */
find_low_pfn_range();
printk(KERN_DEBUG "initial memory mapped : 0 - %08lx\n",
max_pfn_mapped<<PAGE_SHIFT);
max_low_pfn_mapped = init_memory_mapping(0, max_low_pfn<<PAGE_SHIFT);
max_pfn_mapped = max_low_pfn_mapped;
initmem_init(0, max_pfn);
}
void __init setup_arch(char **cmdline_p)
{
printk(KERN_INFO "Command line: %s\n", saved_command_line);
ROOT_DEV = old_decode_dev(ORIG_ROOT_DEV);
screen_info = SCREEN_INFO;
edid_info = EDID_INFO;
saved_video_mode = SAVED_VIDEO_MODE;
bootloader_type = LOADER_TYPE;
#ifdef CONFIG_BLK_DEV_RAM
rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
#endif
#ifdef CONFIG_EFI
if (!strncmp(EFI_LOADER_SIG, "EFIL", 4))
efi_enabled = 1;
#endif
setup_memory_region();
copy_edd();
if (!MOUNT_ROOT_RDONLY)
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 = (unsigned long) &_end;
init_mm.pgd = __va(__pa_symbol(&init_level4_pgt));
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;
parse_cmdline_early(cmdline_p);
finish_e820_parsing();
early_identify_cpu(&boot_cpu_data);
/*
* partially used pages are not usable - thus
* we are rounding upwards:
*/
end_pfn = e820_end_of_ram();
num_physpages = end_pfn; /* for pfn_valid */
check_efer();
discover_ebda();
init_memory_mapping(0, (end_pfn_map << PAGE_SHIFT));
if (efi_enabled)
efi_map_memmap();
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(&boot_cpu_data);
/*
* init_hypervisor gets called more than one time throughout
* the life of the cpu, but that hurts kvm. We only need it
* once, so we do it explicitly here
*/
if (boot_cpu_data.x86_hyper_vendor == X86_HYPER_VENDOR_KVM)
kvmclock_init();
#ifdef CONFIG_ACPI
/*
* Initialize the ACPI boot-time table parser (gets the RSDP and SDT).
* Call this early for SRAT node setup.
*/
acpi_boot_table_init();
#endif
#ifdef CONFIG_ACPI_NUMA
/*
* Parse SRAT to discover nodes.
*/
acpi_numa_init();
#endif
#ifdef CONFIG_NUMA
numa_initmem_init(0, end_pfn);
#else
contig_initmem_init(0, end_pfn);
#endif
/* Reserve direct mapping */
reserve_bootmem_generic(table_start << PAGE_SHIFT,
(table_end - table_start) << PAGE_SHIFT,
BOOTMEM_DEFAULT);
/* reserve kernel */
reserve_bootmem_generic(__pa_symbol(&_text),
__pa_symbol(&_end) - __pa_symbol(&_text),
BOOTMEM_DEFAULT);
/*
* reserve physical page 0 - it's a special BIOS page on many boxes,
* enabling clean reboots, SMP operation, laptop functions.
*/
reserve_bootmem_generic(0, PAGE_SIZE, BOOTMEM_DEFAULT);
/* reserve ebda region */
if (ebda_addr)
reserve_bootmem_generic(ebda_addr, ebda_size,
BOOTMEM_DEFAULT);
#ifdef CONFIG_SMP
/* Reserve SMP trampoline */
reserve_bootmem_generic(SMP_TRAMPOLINE_BASE, 2*PAGE_SIZE,
BOOTMEM_DEFAULT);
#endif
#ifdef CONFIG_ACPI_SLEEP
/*
* Reserve low memory region for sleep support.
*/
acpi_reserve_bootmem();
#endif
#ifdef CONFIG_X86_LOCAL_APIC
/*
* Find and reserve possible boot-time SMP configuration:
*/
find_smp_config();
#endif
#ifdef CONFIG_BLK_DEV_INITRD
if (LOADER_TYPE && INITRD_START) {
if (INITRD_START + INITRD_SIZE <= (end_pfn << PAGE_SHIFT)) {
reserve_bootmem_generic(INITRD_START, INITRD_SIZE,
BOOTMEM_DEFAULT);
initrd_start =
INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
initrd_end = initrd_start+INITRD_SIZE;
}
else {
printk(KERN_ERR "initrd extends beyond end of memory "
"(0x%08lx > 0x%08lx)\ndisabling initrd\n",
(unsigned long)(INITRD_START + INITRD_SIZE),
(unsigned long)(end_pfn << PAGE_SHIFT));
initrd_start = 0;
}
}
#endif
#ifdef CONFIG_KEXEC
if ((crashk_res.start < crashk_res.end) &&
(crashk_res.end <= (end_pfn << PAGE_SHIFT))) {
if (reserve_bootmem_generic(crashk_res.start,
crashk_res.end - crashk_res.start + 1,
BOOTMEM_EXCLUSIVE) < 0) {
printk(KERN_ERR "crashkernel reservation failed - "
"memory is in use\n");
crashk_res.start = crashk_res.end = 0;
}
}
else {
printk(KERN_ERR "Memory for crash kernel (0x%lx to 0x%lx) not"
"within permissible range\ndisabling kdump\n",
crashk_res.start, crashk_res.end);
crashk_res.end = 0;
crashk_res.start = 0;
}
#endif
reserve_ibft_region();
paging_init();
check_ioapic();
/*
* set this early, so we dont allocate cpu0
* if MADT list doesnt list BSP first
* mpparse.c/MP_processor_info() allocates logical cpu numbers.
*/
cpu_set(0, cpu_present_map);
#ifdef CONFIG_ACPI
/*
* Read APIC and some other early information from ACPI tables.
*/
acpi_boot_init();
#endif
init_cpu_to_node();
#ifdef CONFIG_X86_LOCAL_APIC
/*
* get boot-time SMP configuration:
*/
if (smp_found_config)
get_smp_config();
init_apic_mappings();
#endif
/*
* Request address space for all standard RAM and ROM resources
* and also for regions reported as reserved by the e820.
*/
probe_roms();
e820_reserve_resources();
e820_mark_nosave_regions();
request_resource(&iomem_resource, &video_ram_resource);
{
unsigned i;
/* request I/O space for devices used on all i[345]86 PCs */
for (i = 0; i < STANDARD_IO_RESOURCES; i++)
request_resource(&ioport_resource, &standard_io_resources[i]);
}
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
}
