/* * 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/trampoline.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))); BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); /* 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); if (console_loglevel == 10) early_printk("Kernel alive\n"); x86_64_start_reservations(real_mode_data); } void __init x86_64_start_reservations(char *real_mode_data) { copy_bootdata(__va(real_mode_data)); reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "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(); /* * 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(); }