| /* |
| * 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 <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> |
| |
| static void __init zap_identity_mappings(void) |
| { |
| pgd_t *pgd = pgd_offset_k(0UL); |
| pgd_clear(pgd); |
| __flush_tlb_all(); |
| } |
| |
| /* 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 void __init copy_bootdata(char *real_mode_data) |
| { |
| char * command_line; |
| |
| memcpy(&boot_params, real_mode_data, sizeof boot_params); |
| if (boot_params.hdr.cmd_line_ptr) { |
| command_line = __va(boot_params.hdr.cmd_line_ptr); |
| memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
| } |
| } |
| |
| 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 < KERNEL_IMAGE_START); |
| BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE); |
| BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
| BUILD_BUG_ON((KERNEL_IMAGE_START & ~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))); |
| |
| /* clear bss before set_intr_gate with early_idt_handler */ |
| clear_bss(); |
| |
| /* Make NULL pointers segfault */ |
| zap_identity_mappings(); |
| |
| /* Cleanup the over mapped high alias */ |
| cleanup_highmap(); |
| |
| for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { |
| #ifdef CONFIG_EARLY_PRINTK |
| set_intr_gate(i, &early_idt_handlers[i]); |
| #else |
| set_intr_gate(i, early_idt_handler); |
| #endif |
| } |
| load_idt((const struct desc_ptr *)&idt_descr); |
| |
| early_printk("Kernel alive\n"); |
| |
| for (i = 0; i < NR_CPUS; i++) |
| cpu_pda(i) = &boot_cpu_pda[i]; |
| |
| pda_init(0); |
| copy_bootdata(__va(real_mode_data)); |
| |
| reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS"); |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| /* Reserve INITRD */ |
| if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { |
| unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; |
| unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; |
| unsigned long ramdisk_end = ramdisk_image + ramdisk_size; |
| reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); |
| } |
| #endif |
| |
| reserve_ebda_region(); |
| reserve_setup_data(); |
| |
| /* |
| * 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. |
| */ |
| |
| start_kernel(); |
| } |