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AMD64 Technology 24594 Rev. 3.10 February 2005CS.sel = temp_CSCS.base = temp_CS SHL 4}RFLAGS.TF,RF clearedRIP = temp_RIP // RFLAGS.IF cleared if IOPL = 3// RFLAGS.VIF cleared if IOPL < 3EXITINT_N_VIRTUAL_TO_PROTECTED:temp_idt_desc = READ_IDT (temp_int_n_vector)IF (temp_idt_desc.attr.type = ’taskgate’)TASK_SWITCH // using tss selector in the task gate as the target tssIF ((temp_idt_desc.attr.type = ’intgate32’)|| (temp_idt_desc.attr.type = ’trapgate32’))// the size of the gate controls the size of the stack pushesV=4-byte // legacy mode, using a 32-bit gateELSE // gate is intgate16 or trapgate16V=2-byte// legacy mode, using a 16-bit gatetemp_RIP = temp_idt_desc.offsetCS = READ_DESCRIPTOR (temp_idt_desc.segment, intcs_chk)IF (CS.attr.dpl!=0) // Handler must run at CPL 0.EXCEPTION [#GP(CS.sel)]CPL = 0temp_ist = 0// Legacy mode doesn’t use ist pointerstemp_SS_desc:temp_RSP = READ_INNER_LEVEL_STACK_POINTER (CPL, temp_ist)RSP.q = temp_RSPSS = temp_SS_descPUSH.v old_GS // #SS on the following pushes use SS.sel as error code.PUSH.v old_FSPUSH.v old_DSPUSH.v old_ESPUSH.v old_SSPUSH.v old_RSPPUSH.v old_RFLAGS // Pushed with RF clear.PUSH.v old_CSPUSH.v next_RIPIF (temp_RIP > CS.limit)EXCEPTION [#GP(0)]DS = NULL// can’t use virtual-mode selectors in protected mode160 INT
24594 Rev. 3.10 February 2005 AMD64 TechnologyES = NULLFS = NULLGS = NULL// can’t use virtual-mode selectors in protected mode// can’t use virtual-mode selectors in protected mode// can’t use virtual-mode selectors in protected modeRFLAGS.VM,NT,TF,RF clearedRFLAGS.IF cleared if interrupt gateRIP = temp_RIPEXITRelated InstructionsINT 3, INTO, BOUNDrFLAGS AffectedIf a task switch occurs, all flags are modified. Otherwise settings are as follows:ID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CFM M M 0 M M 021 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0Note: Bits 31–22, 15, 5, 3, and 1 are reserved. A flag set to 1 or cleared to 0 is M (modified). Unaffected flags are blank. Undefinedflags are U.INT 161
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