mirror of https://gitee.com/openkylin/linux.git
198 lines
5.1 KiB
C
198 lines
5.1 KiB
C
/*
|
|
* prepare to run common code
|
|
*
|
|
* Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/linkage.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/start_kernel.h>
|
|
#include <linux/io.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/tlbflush.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/kdebug.h>
|
|
#include <asm/e820.h>
|
|
#include <asm/bios_ebda.h>
|
|
#include <asm/bootparam_utils.h>
|
|
#include <asm/microcode.h>
|
|
#include <asm/kasan.h>
|
|
|
|
/*
|
|
* Manage page tables very early on.
|
|
*/
|
|
extern pgd_t early_level4_pgt[PTRS_PER_PGD];
|
|
extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD];
|
|
static unsigned int __initdata next_early_pgt = 2;
|
|
pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
|
|
|
|
/* Wipe all early page tables except for the kernel symbol map */
|
|
static void __init reset_early_page_tables(void)
|
|
{
|
|
memset(early_level4_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1));
|
|
next_early_pgt = 0;
|
|
write_cr3(__pa_nodebug(early_level4_pgt));
|
|
}
|
|
|
|
/* Create a new PMD entry */
|
|
int __init early_make_pgtable(unsigned long address)
|
|
{
|
|
unsigned long physaddr = address - __PAGE_OFFSET;
|
|
pgdval_t pgd, *pgd_p;
|
|
pudval_t pud, *pud_p;
|
|
pmdval_t pmd, *pmd_p;
|
|
|
|
/* Invalid address or early pgt is done ? */
|
|
if (physaddr >= MAXMEM || read_cr3() != __pa_nodebug(early_level4_pgt))
|
|
return -1;
|
|
|
|
again:
|
|
pgd_p = &early_level4_pgt[pgd_index(address)].pgd;
|
|
pgd = *pgd_p;
|
|
|
|
/*
|
|
* The use of __START_KERNEL_map rather than __PAGE_OFFSET here is
|
|
* critical -- __PAGE_OFFSET would point us back into the dynamic
|
|
* range and we might end up looping forever...
|
|
*/
|
|
if (pgd)
|
|
pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base);
|
|
else {
|
|
if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) {
|
|
reset_early_page_tables();
|
|
goto again;
|
|
}
|
|
|
|
pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++];
|
|
memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD);
|
|
*pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
|
|
}
|
|
pud_p += pud_index(address);
|
|
pud = *pud_p;
|
|
|
|
if (pud)
|
|
pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base);
|
|
else {
|
|
if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) {
|
|
reset_early_page_tables();
|
|
goto again;
|
|
}
|
|
|
|
pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++];
|
|
memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD);
|
|
*pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
|
|
}
|
|
pmd = (physaddr & PMD_MASK) + early_pmd_flags;
|
|
pmd_p[pmd_index(address)] = pmd;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Don't add a printk in there. printk relies on the PDA which is not initialized
|
|
yet. */
|
|
static void __init clear_bss(void)
|
|
{
|
|
memset(__bss_start, 0,
|
|
(unsigned long) __bss_stop - (unsigned long) __bss_start);
|
|
}
|
|
|
|
static unsigned long get_cmd_line_ptr(void)
|
|
{
|
|
unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
|
|
|
|
cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32;
|
|
|
|
return cmd_line_ptr;
|
|
}
|
|
|
|
static void __init copy_bootdata(char *real_mode_data)
|
|
{
|
|
char * command_line;
|
|
unsigned long cmd_line_ptr;
|
|
|
|
memcpy(&boot_params, real_mode_data, sizeof boot_params);
|
|
sanitize_boot_params(&boot_params);
|
|
cmd_line_ptr = get_cmd_line_ptr();
|
|
if (cmd_line_ptr) {
|
|
command_line = __va(cmd_line_ptr);
|
|
memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
|
|
}
|
|
}
|
|
|
|
asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* Build-time sanity checks on the kernel image and module
|
|
* area mappings. (these are purely build-time and produce no code)
|
|
*/
|
|
BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map);
|
|
BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE);
|
|
BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
|
|
BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0);
|
|
BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
|
|
BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
|
|
BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
|
|
(__START_KERNEL & PGDIR_MASK)));
|
|
BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
|
|
|
|
cr4_init_shadow();
|
|
|
|
/* Kill off the identity-map trampoline */
|
|
reset_early_page_tables();
|
|
|
|
clear_bss();
|
|
|
|
clear_page(init_level4_pgt);
|
|
|
|
kasan_early_init();
|
|
|
|
for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
|
|
set_intr_gate(i, early_idt_handler_array[i]);
|
|
load_idt((const struct desc_ptr *)&idt_descr);
|
|
|
|
copy_bootdata(__va(real_mode_data));
|
|
|
|
/*
|
|
* Load microcode early on BSP.
|
|
*/
|
|
load_ucode_bsp();
|
|
|
|
/* set init_level4_pgt kernel high mapping*/
|
|
init_level4_pgt[511] = early_level4_pgt[511];
|
|
|
|
x86_64_start_reservations(real_mode_data);
|
|
}
|
|
|
|
void __init x86_64_start_reservations(char *real_mode_data)
|
|
{
|
|
/* version is always not zero if it is copied */
|
|
if (!boot_params.hdr.version)
|
|
copy_bootdata(__va(real_mode_data));
|
|
|
|
x86_early_init_platform_quirks();
|
|
reserve_ebda_region();
|
|
|
|
switch (boot_params.hdr.hardware_subarch) {
|
|
case X86_SUBARCH_INTEL_MID:
|
|
x86_intel_mid_early_setup();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
start_kernel();
|
|
}
|