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AMD64 Technology 24594 Rev. 3.10 February 2005temp_offset = selector AND 0xfff8 // upper 13 bits give an offset// in the descriptor tableIF (selector.TI = 0)// read 8 bytes from the gdt, split it into// (base,limit,attr) if the type bitstemp_desc = READ_MEM.q [gdt:temp_offset]// indicate a block of memory, or split// it into (segment,offset,attr)// if the type bits indicate// a gate, and save the result in temp_descELSEtemp_desc = READ_MEM.q [ldt:temp_offset]// read 8 bytes from the ldt, split it into// (base,limit,attr) if the type bits// indicate a block of memory, or split// it into (segment,offset,attr) if the type// bits indicate a gate, and save the result// in temp_descIF (selector.rpl or temp_desc.attr.dpl is illegal for the current mode/cpl)EXCEPTION [#GP(selector)]IF (temp_desc.attr.type is illegal for the current mode/chktype)EXCEPTION [#GP(selector)]IF (temp_desc.attr.p=0)EXCEPTION [#NP(selector)]RETURN (temp_desc)/////////////////////////////////////////////////////////////////////////////////// READ_IDT // Read an 8-byte descriptor from the IDT, return the descriptor/////////////////////////////////////////////////////////////////////////////////usage:temp_idt_desc = READ_IDT (vector)// "vector" is the interrupt vector numberdefinition:IF (LONG_MODE) // long-mode idt descriptors are 16 bytes longtemp_offset = vector*16ELSE // (LEGACY_MODE) legacy-protected-mode idt descriptors are 8 bytes longtemp_offset = vector*8temp_desc = READ_MEM.q [idt:temp_offset]// read 8 bytes from the idt, split it into// (segment,offset,attr), and save it in temp_descIF (temp_desc.attr.dpl is illegal for the current mode/cpl)56 Chapter 2: Instruction Overview
24594 Rev. 3.10 February 2005 AMD64 Technology// exception, with error code that indicates this idt gateEXCEPTION [#GP(vector*8+2)]IF (temp_desc.attr.type is illegal for the current mode)// exception, with error code that indicates this idt gateEXCEPTION [#GP(vector*8+2)]IF (temp_desc.attr.p=0)EXCEPTION [#NP(vector*8+2)]// segment-not-present exception, with an error code that// indicates this idt gateRETURN (temp_desc)/////////////////////////////////////////////////////////////////////////////////// READ_INNER_LEVEL_STACK_POINTER// Read a new stack pointer (rsp or ss:esp) from the tss/////////////////////////////////////////////////////////////////////////////////usage:temp_SS_desc:temp_RSP = READ_INNER_LEVEL_STACK_POINTER (new_cpl, ist_index)definition:IF (LONG_MODE){IF (ist_index>0)// if IST is selected, read an ISTn stack pointer from the tsstemp_RSP = READ_MEM.q [tss:ist_index*8+28]ELSE // (ist_index=0)// otherwise read an RSPn stack pointer from the tsstemp_RSP = READ_MEM.q [tss:new_cpl*8+4]temp_SS_desc.sel = NULL + new_cpl// in long mode, changing to lower cpl sets SS.sel to// NULL+new_cpl}ELSE // (LEGACY_MODE){temp_RSP = READ_MEM.d [tss:new_cpl*8+4]// read ESPn from the tsstemp_sel = READ_MEM.d [tss:new_cpl*8+8]// read SSn from the tsstemp_SS_desc = READ_DESCRIPTOR (temp_sel, ss_chk)}return (temp_RSP:temp_SS_desc)/////////////////////////////////////////////////////////////////////////////////// READ_BIT_ARRAY // Read 1 bit from a bit array in memory/////////////////////////////////////////////////////////////////////////////////Chapter 2: Instruction Overview 57
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