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UefiCpuPkg: Added segment descriptors' data structures.
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Mikhail Krichanov committed Nov 20, 2023
1 parent 1cdfde2 commit 6fae788
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Showing 2 changed files with 297 additions and 108 deletions.
250 changes: 160 additions & 90 deletions UefiCpuPkg/Library/CpuArchLib/CpuGdt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -14,104 +14,174 @@
// Global descriptor table (GDT) Template
//
STATIC GDT_ENTRIES mGdtTemplate = {
//
// NULL_SEL
//
{
0x0, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x0, // type
0x0, // limit 19:16, flags
0x0, // base 31:24
.Null = {
.SegmentLimit_15_0 = 0x0,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,
.Type = 0x0,
.S = 0,
.DPL = 0,
.P = 0,
.SegmentLimit_19_16 = 0x0,
.AVL = 0,
.L = 0,
.D_B = 0,
.G = 0,
.BaseAddress_31_24 = 0x0
},
//
// LINEAR_SEL
//
{
0x0FFFF, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x092, // present, ring 0, data, read/write
0x0CF, // page-granular, 32-bit
0x0,
.Linear = {
.SegmentLimit_15_0 = 0xFFFF,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,

.Accessed = 0,
.Writable = 1,
.ExpansionDirection = 0,
.IsCode = 0,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 0,
.SegmentPresent = 1,

.SegmentLimit_19_16 = 0xF,
.Available = 0,
.Reserved = 0,
.UpperBound = 1,
.Granularity = 1,
.BaseAddress_31_24 = 0x0
},
//
// LINEAR_CODE_SEL
//
{
0x0FFFF, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x09F, // present, ring 0, code, execute/read, conforming, accessed
0x0CF, // page-granular, 32-bit
0x0,
.LinearCode = {
.SegmentLimit_15_0 = 0xFFFF,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,

.Accessed = 1,
.Readable = 1,
.Conforming = 1,
.IsCode = 1,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 0,
.SegmentPresent = 1,

.SegmentLimit_19_16 = 0xF,
.Available = 0,
.Reserved = 0,
.Is32Bit = 1,
.Granularity = 1,
.BaseAddress_31_24 = 0x0
},
//
// SYS_DATA_SEL
//
{
0x0FFFF, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x093, // present, ring 0, data, read/write, accessed
0x0CF, // page-granular, 32-bit
0x0,
.SysData = {
.SegmentLimit_15_0 = 0xFFFF,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,

.Accessed = 1,
.Writable = 1,
.ExpansionDirection = 0,
.IsCode = 0,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 0,
.SegmentPresent = 1,

.SegmentLimit_19_16 = 0xF,
.Available = 0,
.Reserved = 0,
.UpperBound = 1,
.Granularity = 1,
.BaseAddress_31_24 = 0x0
},
//
// SYS_CODE_SEL
//
{
0x0FFFF, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x09A, // present, ring 0, code, execute/read
0x0CF, // page-granular, 32-bit
0x0,
.SysCode = {
.SegmentLimit_15_0 = 0xFFFF,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,

.Accessed = 0,
.Readable = 1,
.Conforming = 0,
.IsCode = 1,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 0,
.SegmentPresent = 1,

.SegmentLimit_19_16 = 0xF,
.Available = 0,
.Reserved = 0,
.Is32Bit = 1,
.Granularity = 1,
.BaseAddress_31_24 = 0x0
},
//
// SYS_CODE16_SEL
//
{
0x0FFFF, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x09A, // present, ring 0, code, execute/read
0x08F, // page-granular, 16-bit
0x0, // base 31:24
.SysCode16 = {
.SegmentLimit_15_0 = 0xFFFF,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,

.Accessed = 0,
.Readable = 1,
.Conforming = 0,
.IsCode = 1,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 0,
.SegmentPresent = 1,

.SegmentLimit_19_16 = 0xF,
.Available = 0,
.Reserved = 0,
.Is32Bit = 0,
.Granularity = 1,
.BaseAddress_31_24 = 0x0
},
//
// LINEAR_DATA64_SEL
//
{
0x0FFFF, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x092, // present, ring 0, data, read/write
0x0CF, // page-granular, 32-bit
0x0,
.LinearData64 = {
.SegmentLimit_15_0 = 0xFFFF,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,

.Accessed = 0,
.Writable = 1,
.ExpansionDirection = 0,
.IsCode = 0,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 0,
.SegmentPresent = 1,

.SegmentLimit_19_16 = 0xF,
.Available = 0,
.Reserved = 0,
.UpperBound = 1,
.Granularity = 1,
.BaseAddress_31_24 = 0x0
},
//
// LINEAR_CODE64_SEL
//
{
0x0FFFF, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x09A, // present, ring 0, code, execute/read
0x0AF, // page-granular, 64-bit code
0x0, // base (high)
.LinearCode64 = {
.Reserved1 = 0x0,
.Reserved2 = 0x0,

.Accessed = 0,
.Readable = 1,
.Conforming = 0,
.IsCode = 1,
.IsNotSystemSegment = 1,
.DescriptorPrivilegeLevel = 0,
.SegmentPresent = 1,

.Reserved3 = 0x0,
.Available = 0,
.LongMode = 1,
.Is32Bit = 0,
.Granularity = 1,
.Reserved4 = 0x0
},
//
// SPARE5_SEL
//
{
0x0, // limit 15:0
0x0, // base 15:0
0x0, // base 23:16
0x0, // type
0x0, // limit 19:16, flags
0x0, // base 31:24
.Spare5 = {
.SegmentLimit_15_0 = 0x0,
.BaseAddress_15_0 = 0x0,
.BaseAddress_23_16 = 0x0,
.Type = 0x0,
.S = 0,
.DPL = 0,
.P = 0,
.SegmentLimit_19_16 = 0x0,
.AVL = 0,
.L = 0,
.D_B = 0,
.G = 0,
.BaseAddress_31_24 = 0x0,
},
};

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