1 /* 2 * prepare to run common code 3 * 4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE 5 */ 6 7 #include <linux/init.h> 8 #include <linux/linkage.h> 9 #include <linux/types.h> 10 #include <linux/kernel.h> 11 #include <linux/string.h> 12 #include <linux/percpu.h> 13 #include <linux/start_kernel.h> 14 #include <linux/io.h> 15 16 #include <asm/processor.h> 17 #include <asm/proto.h> 18 #include <asm/smp.h> 19 #include <asm/setup.h> 20 #include <asm/desc.h> 21 #include <asm/pgtable.h> 22 #include <asm/tlbflush.h> 23 #include <asm/sections.h> 24 #include <asm/kdebug.h> 25 #include <asm/e820.h> 26 #include <asm/bios_ebda.h> 27 #include <asm/trampoline.h> 28 29 /* boot cpu pda */ 30 static struct x8664_pda _boot_cpu_pda; 31 32 #ifdef CONFIG_SMP 33 /* 34 * We install an empty cpu_pda pointer table to indicate to early users 35 * (numa_set_node) that the cpu_pda pointer table for cpus other than 36 * the boot cpu is not yet setup. 37 */ 38 static struct x8664_pda *__cpu_pda[NR_CPUS] __initdata; 39 #else 40 static struct x8664_pda *__cpu_pda[NR_CPUS] __read_mostly; 41 #endif 42 43 void __init x86_64_init_pda(void) 44 { 45 _cpu_pda = __cpu_pda; 46 cpu_pda(0) = &_boot_cpu_pda; 47 pda_init(0); 48 } 49 50 static void __init zap_identity_mappings(void) 51 { 52 pgd_t *pgd = pgd_offset_k(0UL); 53 pgd_clear(pgd); 54 __flush_tlb_all(); 55 } 56 57 /* Don't add a printk in there. printk relies on the PDA which is not initialized 58 yet. */ 59 static void __init clear_bss(void) 60 { 61 memset(__bss_start, 0, 62 (unsigned long) __bss_stop - (unsigned long) __bss_start); 63 } 64 65 static void __init copy_bootdata(char *real_mode_data) 66 { 67 char * command_line; 68 69 memcpy(&boot_params, real_mode_data, sizeof boot_params); 70 if (boot_params.hdr.cmd_line_ptr) { 71 command_line = __va(boot_params.hdr.cmd_line_ptr); 72 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); 73 } 74 } 75 76 void __init x86_64_start_kernel(char * real_mode_data) 77 { 78 int i; 79 80 /* 81 * Build-time sanity checks on the kernel image and module 82 * area mappings. (these are purely build-time and produce no code) 83 */ 84 BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START); 85 BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE); 86 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); 87 BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0); 88 BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); 89 BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); 90 BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == 91 (__START_KERNEL & PGDIR_MASK))); 92 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); 93 94 /* clear bss before set_intr_gate with early_idt_handler */ 95 clear_bss(); 96 97 /* Make NULL pointers segfault */ 98 zap_identity_mappings(); 99 100 /* Cleanup the over mapped high alias */ 101 cleanup_highmap(); 102 103 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { 104 #ifdef CONFIG_EARLY_PRINTK 105 set_intr_gate(i, &early_idt_handlers[i]); 106 #else 107 set_intr_gate(i, early_idt_handler); 108 #endif 109 } 110 load_idt((const struct desc_ptr *)&idt_descr); 111 112 if (console_loglevel == 10) 113 early_printk("Kernel alive\n"); 114 115 x86_64_init_pda(); 116 117 x86_64_start_reservations(real_mode_data); 118 } 119 120 void __init x86_64_start_reservations(char *real_mode_data) 121 { 122 copy_bootdata(__va(real_mode_data)); 123 124 reserve_trampoline_memory(); 125 126 reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS"); 127 128 #ifdef CONFIG_BLK_DEV_INITRD 129 /* Reserve INITRD */ 130 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { 131 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image; 132 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size; 133 unsigned long ramdisk_end = ramdisk_image + ramdisk_size; 134 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); 135 } 136 #endif 137 138 reserve_ebda_region(); 139 140 /* 141 * At this point everything still needed from the boot loader 142 * or BIOS or kernel text should be early reserved or marked not 143 * RAM in e820. All other memory is free game. 144 */ 145 146 start_kernel(); 147 } 148