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| 3 | ;; Copyright (C) KolibriOS team 2004-2014. All rights reserved. ;; |
3 | ;; Copyright (C) KolibriOS team 2004-2014. All rights reserved. ;; |
| 4 | ;; Distributed under terms of the GNU General Public License ;; |
4 | ;; Distributed under terms of the GNU General Public License ;; |
| 5 | ;; ;; |
5 | ;; ;; |
| 6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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| 7 | 7 | ||
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| 8 | $Revision: 4608 $ |
8 | $Revision: 4619 $ |
| 9 | 9 | ||
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| 10 | ; Initializes MTRRs. |
10 | ; Initializes MTRRs. |
| Line 819... | Line 819... | ||
| 819 | ; Try to detect this and let the user know that the low performance |
819 | ; Try to detect this and let the user know that the low performance |
| 820 | ; is caused by some problem and is not a global property of the system. |
820 | ; is caused by some problem and is not a global property of the system. |
| 821 | ; Let's hope he would report it to developers... |
821 | ; Let's hope he would report it to developers... |
| 822 | proc mtrr_validate |
822 | proc mtrr_validate |
| 823 | ; 1. If MTRRs are not supported, they cannot be configured improperly. |
823 | ; 1. If MTRRs are not supported, they cannot be configured improperly. |
| - | 824 | ; Note: VirtualBox claims MTRR support in cpuid, but emulates MTRRCAP=0, |
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| - | 825 | ; which is efficiently equivalent to absent MTRRs. |
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| - | 826 | ; So check [num_variable_mtrrs] instead of CAPS_MTRR in [cpu_caps]. |
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| 824 | bt [cpu_caps], CAPS_MTRR |
827 | cmp [num_variable_mtrrs], 0 |
| 825 | jnc .exit |
828 | jz .exit |
| 826 | ; 2. If variable-range MTRRs are not configured, this is a problem. |
829 | ; 2. If variable-range MTRRs are not configured, this is a problem. |
| 827 | mov ecx, 0x2FF |
830 | mov ecx, 0x2FF |
| 828 | rdmsr |
831 | rdmsr |
| 829 | test ah, 8 |
832 | test ah, 8 |
| 830 | jz .fail |
833 | jz .fail |