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Rev 9715 Rev 9950
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;; Copyright (C) KolibriOS team 2004-2022. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2004-2022. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;;                                                              ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 9715 $
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; Initializes MTRRs.
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$Revision: 9950 $
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proc init_mtrr
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; Initializes PAT (Page Attribute Table) and MTRRs.
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proc init_pat_mtrr
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        cmp     [BOOT.mtrr], byte 2
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        je      .exit
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        bt      [cpu_caps], CAPS_PAT    ; if PAT is not supported, use MTRR
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        jnc     .use_mtrr
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; Change PAT_MSR for write combining memory.
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        mov     ecx, MSR_CR_PAT
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        mov     eax, PAT_VALUE          ; UC UCM WC WB
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        mov     edx, eax
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        wrmsr
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        cmp     [BOOT.mtrr], byte 2
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        ret
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        je      .exit
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.use_mtrr:
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        bt      [cpu_caps], CAPS_MTRR
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        bt      [cpu_caps], CAPS_MTRR
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        wrmsr
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        wrmsr
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        inc     ecx
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        inc     ecx
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        jmp     @b
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        jmp     @b
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; 9i. Check PAT support and reprogram PAT_MASR for write combining memory
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        bt      [cpu_caps], CAPS_PAT
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        jnc     @F
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        mov     ecx, MSR_CR_PAT
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        mov     eax, PAT_VALUE  ;UC UCM WC WB
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        mov     edx, eax
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        wrmsr
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; 9j. Changes are done.
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; 9i. Changes are done.
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        call    mtrr_end_change
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        call    mtrr_end_change
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.abort:
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.abort: