forked from KolibriOS/kolibrios
224 lines
4.6 KiB
PHP
224 lines
4.6 KiB
PHP
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init_fpu:
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clts
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fninit
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bt [cpu_caps], CAPS_FXSR
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jnc .no_FXSR
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stdcall kernel_alloc, 512*256
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mov [fpu_data], eax
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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 [eax]
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ret
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.no_FXSR:
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stdcall kernel_alloc, 112*256
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mov [fpu_data], eax
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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 [eax]
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ret
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align 4
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proc fpu_save
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clts
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mov ebx, [fpu_owner]
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shl ebx, 8
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mov eax, [ebx+PROC_BASE+0x10]
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mov ebx, [CURRENT_TASK]
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mov [fpu_owner], ebx
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bt [cpu_caps], CAPS_FXSR
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jnc .no_SSE
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fxsave [eax]
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fninit ;re-init fpu
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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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endp
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align 4
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proc fpu_restore
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mov ebx, [CURRENT_TASK]
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shl ebx, 8
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mov eax, [ebx+PROC_BASE+0x10]
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bt [cpu_caps], CAPS_FXSR
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jnc .no_SSE
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fxrstor [eax]
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ret
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.no_SSE:
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fnclex ;fix possible problems
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frstor [eax]
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ret
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endp
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align 4
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e7: ;#NM exception handler
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save_ring3_context
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clts
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mov ax, os_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+PROC_BASE+APPDATA.fpu_state]
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bt [cpu_caps], CAPS_FXSR
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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+PROC_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+PROC_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 1
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endg
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reg_eip equ ebp+4
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reg_cs equ ebp+8
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reg_eflags equ ebp+12
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reg_esp equ ebp+16
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reg_ss equ ebp+20
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align 4
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except_16: ;fpu native exceptions handler
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push ebp
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mov ebp, esp
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push eax
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push ebx
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push ecx
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push edx
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mov ebx, [ss:CURRENT_TASK]
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shl ebx, 8
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mov eax, [ss:ebx+PROC_BASE+APPDATA.fpu_handler]
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test eax, eax
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jz .default
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mov ecx, [reg_eip]
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mov edx, [reg_esp]
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sub edx, 4
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mov [ss:edx+new_app_base], ecx
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mov [reg_esp], edx
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mov dword [reg_eip], eax
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pop edx
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pop ecx
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pop ebx
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pop eax
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leave
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iretd
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.default:
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pop edx
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pop ecx
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pop ebx
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pop eax
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leave
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save_ring3_context ;debugger support
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mov bl, 16
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jmp exc_c
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align 4
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except_19: ;sse exceptions handler
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push ebp
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mov ebp, esp
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push eax
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push ebx
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push ecx
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push edx
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mov ebx, [ss:CURRENT_TASK]
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shl ebx, 8
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mov eax, [ss:ebx+PROC_BASE+APPDATA.sse_handler]
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test eax, eax
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jz .default
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mov ecx, [reg_eip]
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mov edx, [reg_esp]
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sub edx, 4
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mov [ss:edx+new_app_base], ecx
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mov [reg_esp], edx
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mov dword [reg_eip], eax
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pop edx
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pop ecx
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pop ebx
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pop eax
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leave
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iretd
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.default:
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pop edx
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pop ecx
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pop ebx
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pop eax
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leave
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save_ring3_context ;debugger support
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mov bl, 19
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jmp exc_c
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restore reg_eip
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restore reg_cs
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restore reg_eflags
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restore reg_esp
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restore reg_ss
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