| Ky Srinivasan | a2a47c6 | 2010-05-06 12:08:41 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * HyperV Detection code. |
| 3 | * |
| 4 | * Copyright (C) 2010, Novell, Inc. |
| 5 | * Author : K. Y. Srinivasan <ksrinivasan@novell.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, but |
| 13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 15 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 16 | * details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 21 | * |
| 22 | */ |
| 23 | |
| 24 | #include <linux/types.h> |
| 25 | #include <asm/processor.h> |
| 26 | #include <asm/hyperv.h> |
| 27 | #include <asm/mshyperv.h> |
| 28 | |
| 29 | |
| 30 | int ms_hyperv_platform(void) |
| 31 | { |
| 32 | u32 eax, ebx, ecx, edx; |
| 33 | char hyp_signature[13]; |
| 34 | |
| 35 | cpuid(1, &eax, &ebx, &ecx, &edx); |
| 36 | if (!(ecx & HYPERV_HYPERVISOR_PRESENT_BIT)) |
| 37 | return 0; |
| 38 | |
| 39 | cpuid(HYPERV_CPUID_VENDOR_AND_MAX_FUNCTIONS, &eax, &ebx, &ecx, &edx); |
| 40 | *(u32 *)(hyp_signature + 0) = ebx; |
| 41 | *(u32 *)(hyp_signature + 4) = ecx; |
| 42 | *(u32 *)(hyp_signature + 8) = edx; |
| 43 | |
| 44 | if ((eax < HYPERV_CPUID_MIN) || (memcmp("Microsoft Hv", hyp_signature, 12))) |
| 45 | return 0; |
| 46 | return 1; |
| 47 | } |
| 48 | |
| 49 | void __cpuinit ms_hyperv_set_feature_bits(struct cpuinfo_x86 *c) |
| 50 | { |
| 51 | u32 eax, ebx, ecx, edx; |
| 52 | |
| 53 | c->x86_hyper_features = 0; |
| 54 | /* |
| 55 | * Extract the features, recommendations etc. |
| 56 | * The first 9 bits will be used to track hypervisor features. |
| 57 | * The next 6 bits will be used to track the hypervisor |
| 58 | * recommendations. |
| 59 | */ |
| 60 | cpuid(HYPERV_CPUID_FEATURES, &eax, &ebx, &ecx, &edx); |
| 61 | c->x86_hyper_features |= (eax & 0x1ff); |
| 62 | |
| 63 | cpuid(HYPERV_CPUID_ENLIGHTMENT_INFO, &eax, &ebx, &ecx, &edx); |
| 64 | c->x86_hyper_features |= ((eax & 0x3f) << 9); |
| 65 | printk(KERN_INFO "Detected HyperV with features: %x\n", |
| 66 | c->x86_hyper_features); |
| 67 | } |