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ST486DX Datasheet(PDF) 19 Page - STMicroelectronics |
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ST486DX Datasheet(HTML) 19 Page - STMicroelectronics |
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19 / 34 page  ST486DX - SMM SOFTWARE CONSIDERATIONS 29 svts cs:,save_tsr ;str is not valid in real mode db 66h ;32bit version saves everything sgdt fword ptr cs:[save_gdt] db 66h ;32bit version saves everything sidt fword ptr cs:[save_idt] ; at the end of the SMM routine the following code ; sequence will reload the entire CPU state mov eax,cs:save_eax mov ebx,cs:save_ebx mov ecx,cs:save_ecx mov edx,cs:save_edx mov esi,cs:save_esi mov edi,cs:save_edi mov ebp,cs:save_ebp mov esp,cs:save_esp rsdc ds,cs:,save_ds rsdc es,cs:,save_es rsdc fs,cs:,save_fs rsdc gs,cs:,save_gs rsdc ss,cs:,save_ss rsldt cs:,save_ldt rsts cs:,save_tsr db 66h sgdt fword ptr cs:[save_gdt] db 66h sidt fword ptr cs:[save_idt] ; the data space to save the CPU state is in ; the Code Segment for this example save_ds dt ? save_es dt ? save_fs dt ? save_gs dt ? save_ss dt ? save_ldt dt ? save_tsr dt ? save_eax dd ? save_ebx dd ? save_ecx dd ? save_edx dd ? save_esi dd ? save_edi dd ? save_ebp dd ? save_esp dd ? save_gdt df ? save_idt df ? |
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