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Linux/arch/x86/kernel/head64.c

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  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 #include <linux/memblock.h>
 16 
 17 #include <asm/processor.h>
 18 #include <asm/proto.h>
 19 #include <asm/smp.h>
 20 #include <asm/setup.h>
 21 #include <asm/desc.h>
 22 #include <asm/pgtable.h>
 23 #include <asm/tlbflush.h>
 24 #include <asm/sections.h>
 25 #include <asm/kdebug.h>
 26 #include <asm/e820.h>
 27 #include <asm/bios_ebda.h>
 28 #include <asm/bootparam_utils.h>
 29 #include <asm/microcode.h>
 30 #include <asm/kasan.h>
 31 
 32 /*
 33  * Manage page tables very early on.
 34  */
 35 extern pgd_t early_level4_pgt[PTRS_PER_PGD];
 36 extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD];
 37 static unsigned int __initdata next_early_pgt = 2;
 38 pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
 39 
 40 /* Wipe all early page tables except for the kernel symbol map */
 41 static void __init reset_early_page_tables(void)
 42 {
 43         memset(early_level4_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1));
 44         next_early_pgt = 0;
 45         write_cr3(__pa_nodebug(early_level4_pgt));
 46 }
 47 
 48 /* Create a new PMD entry */
 49 int __init early_make_pgtable(unsigned long address)
 50 {
 51         unsigned long physaddr = address - __PAGE_OFFSET;
 52         pgdval_t pgd, *pgd_p;
 53         pudval_t pud, *pud_p;
 54         pmdval_t pmd, *pmd_p;
 55 
 56         /* Invalid address or early pgt is done ?  */
 57         if (physaddr >= MAXMEM || read_cr3() != __pa_nodebug(early_level4_pgt))
 58                 return -1;
 59 
 60 again:
 61         pgd_p = &early_level4_pgt[pgd_index(address)].pgd;
 62         pgd = *pgd_p;
 63 
 64         /*
 65          * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is
 66          * critical -- __PAGE_OFFSET would point us back into the dynamic
 67          * range and we might end up looping forever...
 68          */
 69         if (pgd)
 70                 pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base);
 71         else {
 72                 if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) {
 73                         reset_early_page_tables();
 74                         goto again;
 75                 }
 76 
 77                 pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++];
 78                 memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD);
 79                 *pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
 80         }
 81         pud_p += pud_index(address);
 82         pud = *pud_p;
 83 
 84         if (pud)
 85                 pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base);
 86         else {
 87                 if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) {
 88                         reset_early_page_tables();
 89                         goto again;
 90                 }
 91 
 92                 pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++];
 93                 memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD);
 94                 *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
 95         }
 96         pmd = (physaddr & PMD_MASK) + early_pmd_flags;
 97         pmd_p[pmd_index(address)] = pmd;
 98 
 99         return 0;
100 }
101 
102 /* Don't add a printk in there. printk relies on the PDA which is not initialized 
103    yet. */
104 static void __init clear_bss(void)
105 {
106         memset(__bss_start, 0,
107                (unsigned long) __bss_stop - (unsigned long) __bss_start);
108 }
109 
110 static unsigned long get_cmd_line_ptr(void)
111 {
112         unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
113 
114         cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32;
115 
116         return cmd_line_ptr;
117 }
118 
119 static void __init copy_bootdata(char *real_mode_data)
120 {
121         char * command_line;
122         unsigned long cmd_line_ptr;
123 
124         memcpy(&boot_params, real_mode_data, sizeof boot_params);
125         sanitize_boot_params(&boot_params);
126         cmd_line_ptr = get_cmd_line_ptr();
127         if (cmd_line_ptr) {
128                 command_line = __va(cmd_line_ptr);
129                 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
130         }
131 }
132 
133 asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
134 {
135         int i;
136 
137         /*
138          * Build-time sanity checks on the kernel image and module
139          * area mappings. (these are purely build-time and produce no code)
140          */
141         BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map);
142         BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE);
143         BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
144         BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0);
145         BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
146         BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
147         BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
148                                 (__START_KERNEL & PGDIR_MASK)));
149         BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
150 
151         cr4_init_shadow();
152 
153         /* Kill off the identity-map trampoline */
154         reset_early_page_tables();
155 
156         clear_bss();
157 
158         clear_page(init_level4_pgt);
159 
160         kasan_early_init();
161 
162         for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
163                 set_intr_gate(i, early_idt_handler_array[i]);
164         load_idt((const struct desc_ptr *)&idt_descr);
165 
166         copy_bootdata(__va(real_mode_data));
167 
168         /*
169          * Load microcode early on BSP.
170          */
171         load_ucode_bsp();
172 
173         /* set init_level4_pgt kernel high mapping*/
174         init_level4_pgt[511] = early_level4_pgt[511];
175 
176         x86_64_start_reservations(real_mode_data);
177 }
178 
179 void __init x86_64_start_reservations(char *real_mode_data)
180 {
181         /* version is always not zero if it is copied */
182         if (!boot_params.hdr.version)
183                 copy_bootdata(__va(real_mode_data));
184 
185         x86_early_init_platform_quirks();
186         reserve_ebda_region();
187 
188         switch (boot_params.hdr.hardware_subarch) {
189         case X86_SUBARCH_INTEL_MID:
190                 x86_intel_mid_early_setup();
191                 break;
192         default:
193                 break;
194         }
195 
196         start_kernel();
197 }
198 

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