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Ring3: Some drafts.

This commit is contained in:
Mikhail Krichanov 2023-12-25 15:35:05 +03:00
parent 25d3704cc6
commit 138ecce134
3 changed files with 61 additions and 0 deletions
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54
UefiCpuPkg/Library/CpuArchLib/CpuGdt.c
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@ -183,6 +183,60 @@ STATIC GDT_ENTRIES mGdtTemplate = {
.G = 0,
.BaseAddress_31_24 = 0x0,
},
.Ring3Data64 = {
.SegmentLimit_15_0 = 0xFFFF,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,
.Accessed = 0,
.Writable = 1,
.ExpansionDirection = 0,
.IsCode = 0,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 3,
.SegmentPresent = 1,
.SegmentLimit_19_16 = 0xF,
.Available = 0,
.Reserved = 0,
.UpperBound = 1,
.Granularity = 1,
.BaseAddress_31_24 = 0x0
},
.Ring3Code64 = { // SetCodeSelector () | 5.8.6 Returning from a Called Procedure
.Reserved1 = 0x0,
.Reserved2 = 0x0,
.Accessed = 0,
.Readable = 1,
.Conforming = 0,
.IsCode = 1,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 3,
.SegmentPresent = 1,
.Reserved3 = 0x0,
.Available = 0,
.LongMode = 1,
.Is32Bit = 0,
.Granularity = 1,
.Reserved4 = 0x0
},
// .FromRing3ToRing0 = {
// .Common.OffsetInSegment_15_0 = 0x?,
// .Common.SegmentSelector = (UINT16)LINEAR_CODE64_SEL,
//
// .Common.ParameterCount = 0,
// .Common.Reserved = 0,
//
// .Common.Type = 0xC,
// .Common.IsNotSystemSegment = 0,
// .Common.DescriptorPrivilegeLevel = 3,
// .Common.SegmentPresent = 1,
// .Common.OffsetInSegment_31_16 = 0x?,
// .OffsetInSegment_63_31 = 0x?,
// .Reserved = 0x0
// },
};
/**

5
UefiCpuPkg/Library/CpuArchLib/CpuGdt.h
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@ -159,6 +159,9 @@ typedef struct {
DATA_SEGMENT_32 LinearData64;
CODE_SEGMENT_64 LinearCode64;
SEGMENT_DESCRIPTOR Spare5;
DATA_SEGMENT_32 Ring3Data64;
CODE_SEGMENT_64 Ring3Code64;
// CALL_GATE_64 FromRing3ToRing0;
} GDT_ENTRIES;
#pragma pack ()
@ -172,6 +175,8 @@ typedef struct {
#define LINEAR_DATA64_SEL OFFSET_OF (GDT_ENTRIES, LinearData64)
#define LINEAR_CODE64_SEL OFFSET_OF (GDT_ENTRIES, LinearCode64)
#define SPARE5_SEL OFFSET_OF (GDT_ENTRIES, Spare5)
#define RING3_DATA64_SEL OFFSET_OF (GDT_ENTRIES, Ring3Data64)
#define RING3_CODE64_SEL OFFSET_OF (GDT_ENTRIES, Ring3Code64)
#if defined (MDE_CPU_IA32)
#define CPU_CODE_SEL LINEAR_CODE_SEL

2
UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c
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@ -249,6 +249,8 @@ ArchSetupExceptionStack (
IdtTable[Vector].Bits.Reserved_0 = (UINT8)(Index + 1);
}
// Tss->RSP0 = %rsp
//
// Publish GDT
//