| | 1 | /* |
| | 2 | * Copyright (C) 1994 Linus Torvalds |
| | 3 | * |
| | 4 | * Cyrix stuff, June 1998 by: |
| | 5 | * - Rafael R. Reilova (moved everything from head.S), |
| | 6 | * <rreilova@ececs.uc.edu> |
| | 7 | * - Channing Corn (tests & fixes), |
| | 8 | * - Andrew D. Balsa (code cleanup). |
| | 9 | */ |
| | 10 | #include <linux/init.h> |
| | 11 | #include <linux/utsname.h> |
| | 12 | #include <asm/bugs.h> |
| | 13 | #include <asm/processor.h> |
| | 14 | #include <asm/processor-flags.h> |
| | 15 | #include <asm/fpu/internal.h> |
| | 16 | #include <asm/msr.h> |
| | 17 | #include <asm/paravirt.h> |
| | 18 | #include <asm/alternative.h> |
| | 19 | #include <asm/pgtable.h> |
| | 20 | #include <asm/set_memory.h> |
| | 21 | |
| | 22 | void __init check_bugs(void) |
| | 23 | { |
| | 24 | identify_boot_cpu(); |
| | 25 | |
| | 26 | if (!IS_ENABLED(CONFIG_SMP)) { |
| | 27 | pr_info("CPU: "); |
| | 28 | print_cpu_info(&boot_cpu_data); |
| | 29 | } |
| | 30 | |
| | 31 | #ifdef CONFIG_X86_32 |
| | 32 | /* |
| | 33 | * Check whether we are able to run this kernel safely on SMP. |
| | 34 | * |
| | 35 | * - i386 is no longer supported. |
| | 36 | * - In order to run on anything without a TSC, we need to be |
| | 37 | * compiled for a i486. |
| | 38 | */ |
| | 39 | if (boot_cpu_data.x86 < 4) |
| | 40 | panic("Kernel requires i486+ for 'invlpg' and other features"); |
| | 41 | |
| | 42 | init_utsname()->machine[1] = |
| | 43 | '0' + (boot_cpu_data.x86 > 6 ? 6 : boot_cpu_data.x86); |
| | 44 | alternative_instructions(); |
| | 45 | |
| | 46 | fpu__init_check_bugs(); |
| | 47 | #else /* CONFIG_X86_64 */ |
| | 48 | alternative_instructions(); |
| | 49 | |
| | 50 | /* |
| | 51 | * Make sure the first 2MB area is not mapped by huge pages |
| | 52 | * There are typically fixed size MTRRs in there and overlapping |
| | 53 | * MTRRs into large pages causes slow downs. |
| | 54 | * |
| | 55 | * Right now we don't do that with gbpages because there seems |
| | 56 | * very little benefit for that case. |
| | 57 | */ |
| | 58 | if (!direct_gbpages) |
| | 59 | set_memory_4k((unsigned long)__va(0), 1); |
| | 60 | #endif |
| | 61 | } |
projects / mirror_ubuntu-artful-kernel.git / blame_incremental