Martin Roth | 9df9e939 | 2016-01-12 15:55:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; version 2 of the License. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
Lee Leahy | 2da9524 | 2015-06-12 17:30:33 -0700 | [diff] [blame] | 14 | #include <console/console.h> |
| 15 | #include <cpu/cpu.h> |
| 16 | #include <arch/io.h> |
| 17 | #include <string.h> |
| 18 | #include <cpu/x86/mtrr.h> |
| 19 | #include <cpu/x86/msr.h> |
| 20 | #include <cpu/x86/lapic.h> |
| 21 | #include <arch/cpu.h> |
| 22 | #include <device/path.h> |
| 23 | #include <device/device.h> |
| 24 | #include <smp/spinlock.h> |
| 25 | |
Stefan Reinauer | 9693885 | 2015-06-18 01:23:48 -0700 | [diff] [blame] | 26 | #ifndef __x86_64__ |
Lee Leahy | 2da9524 | 2015-06-12 17:30:33 -0700 | [diff] [blame] | 27 | /* Standard macro to see if a specific flag is changeable */ |
| 28 | static inline int flag_is_changeable_p(uint32_t flag) |
| 29 | { |
| 30 | uint32_t f1, f2; |
| 31 | |
| 32 | asm( |
| 33 | "pushfl\n\t" |
| 34 | "pushfl\n\t" |
| 35 | "popl %0\n\t" |
| 36 | "movl %0,%1\n\t" |
| 37 | "xorl %2,%0\n\t" |
| 38 | "pushl %0\n\t" |
| 39 | "popfl\n\t" |
| 40 | "pushfl\n\t" |
| 41 | "popl %0\n\t" |
| 42 | "popfl\n\t" |
| 43 | : "=&r" (f1), "=&r" (f2) |
| 44 | : "ir" (flag)); |
| 45 | return ((f1^f2) & flag) != 0; |
| 46 | } |
| 47 | |
| 48 | /* Probe for the CPUID instruction */ |
| 49 | int cpu_have_cpuid(void) |
| 50 | { |
| 51 | return flag_is_changeable_p(X86_EFLAGS_ID); |
| 52 | } |
| 53 | |
Stefan Reinauer | 9693885 | 2015-06-18 01:23:48 -0700 | [diff] [blame] | 54 | #else |
| 55 | |
| 56 | int cpu_have_cpuid(void) |
| 57 | { |
| 58 | return 1; |
| 59 | } |
| 60 | #endif |
| 61 | |
Lee Leahy | 2da9524 | 2015-06-12 17:30:33 -0700 | [diff] [blame] | 62 | int cpu_cpuid_extended_level(void) |
| 63 | { |
| 64 | return cpuid_eax(0x80000000); |
| 65 | } |
| 66 | |
| 67 | int cpu_phys_address_size(void) |
| 68 | { |
| 69 | if (!(cpu_have_cpuid())) |
| 70 | return 32; |
| 71 | |
| 72 | if (cpu_cpuid_extended_level() >= 0x80000008) |
| 73 | return cpuid_eax(0x80000008) & 0xff; |
| 74 | |
| 75 | if (cpuid_edx(1) & (CPUID_FEATURE_PAE | CPUID_FEATURE_PSE36)) |
| 76 | return 36; |
| 77 | return 32; |
| 78 | } |