2011-10-14 23:38:50 +02:00
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Copyright (C) KolibriOS team 2004-2007. All rights reserved. ;;
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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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$Revision$
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init_fpu:
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clts
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fninit
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bt [cpu_caps], CAPS_SSE
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jnc .no_SSE
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mov ebx, cr4
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mov ecx, cr0
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or ebx, CR4_OSFXSR+CR4_OSXMMEXPT
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mov cr4, ebx
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and ecx, not (CR0_MP+CR0_EM)
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or ecx, CR0_NE
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mov cr0, ecx
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mov dword [esp-4], SSE_INIT
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ldmxcsr [esp-4]
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xorps xmm0, xmm0
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xorps xmm1, xmm1
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xorps xmm2, xmm2
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xorps xmm3, xmm3
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xorps xmm4, xmm4
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xorps xmm5, xmm5
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xorps xmm6, xmm6
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xorps xmm7, xmm7
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fxsave [fpu_data] ;[eax]
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ret
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.no_SSE:
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mov ecx, cr0
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and ecx, not CR0_EM
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or ecx, CR0_MP+CR0_NE
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mov cr0, ecx
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fnsave [fpu_data]
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ret
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; param
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; eax= 512 bytes memory area
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align 4
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fpu_save:
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push ecx
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push esi
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push edi
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pushfd
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cli
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clts
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mov edi, eax
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mov ecx, [fpu_owner]
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mov esi, [CURRENT_TASK]
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cmp ecx, esi
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jne .save
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call save_context
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jmp .exit
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.save:
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mov [fpu_owner], esi
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shl ecx, 8
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mov eax, [ecx+SLOT_BASE+APPDATA.fpu_state]
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call save_context
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shl esi, 8
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mov esi, [esi+SLOT_BASE+APPDATA.fpu_state]
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mov ecx, 512/4
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cld
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rep movsd
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fninit
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.exit:
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popfd
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pop edi
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pop esi
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pop ecx
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ret
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align 4
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save_context:
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bt [cpu_caps], CAPS_SSE
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jnc .no_SSE
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fxsave [eax]
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ret
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.no_SSE:
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fnsave [eax]
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ret
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align 4
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fpu_restore:
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push ecx
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push esi
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mov esi, eax
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pushfd
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cli
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mov ecx, [fpu_owner]
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mov eax, [CURRENT_TASK]
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cmp ecx, eax
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jne .copy
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clts
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bt [cpu_caps], CAPS_SSE
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jnc .no_SSE
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fxrstor [esi]
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popfd
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pop esi
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pop ecx
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ret
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.no_SSE:
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fnclex ;fix possible problems
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frstor [esi]
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popfd
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pop esi
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pop ecx
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ret
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.copy:
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shl eax, 8
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mov edi, [eax+SLOT_BASE+APPDATA.fpu_state]
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mov ecx, 512/4
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cld
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rep movsd
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popfd
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pop esi
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pop ecx
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ret
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align 4
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except_7: ;#NM exception handler
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save_ring3_context
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clts
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mov ax, app_data;
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mov ds, ax
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mov es, ax
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mov ebx, [fpu_owner]
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cmp ebx, [CURRENT_TASK]
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je .exit
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shl ebx, 8
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mov eax, [ebx+SLOT_BASE+APPDATA.fpu_state]
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bt [cpu_caps], CAPS_SSE
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jnc .no_SSE
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fxsave [eax]
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mov ebx, [CURRENT_TASK]
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mov [fpu_owner], ebx
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shl ebx, 8
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mov eax, [ebx+SLOT_BASE+APPDATA.fpu_state]
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fxrstor [eax]
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.exit:
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restore_ring3_context
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iret
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.no_SSE:
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fnsave [eax]
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mov ebx, [CURRENT_TASK]
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mov [fpu_owner], ebx
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shl ebx, 8
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mov eax, [ebx+SLOT_BASE+APPDATA.fpu_state]
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frstor [eax]
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restore_ring3_context
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iret
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iglobal
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fpu_owner dd 0
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endg
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