diff options
Diffstat (limited to 'UefiCpuPkg/ResetVector')
| -rw-r--r-- | UefiCpuPkg/ResetVector/Vtf0/Ia16/Real16ToFlat32.asm | 63 |
1 files changed, 44 insertions, 19 deletions
diff --git a/UefiCpuPkg/ResetVector/Vtf0/Ia16/Real16ToFlat32.asm b/UefiCpuPkg/ResetVector/Vtf0/Ia16/Real16ToFlat32.asm index 0e79a3984b..f59fc6ead4 100644 --- a/UefiCpuPkg/ResetVector/Vtf0/Ia16/Real16ToFlat32.asm +++ b/UefiCpuPkg/ResetVector/Vtf0/Ia16/Real16ToFlat32.asm @@ -2,7 +2,7 @@ ; @file
; Transition from 16 bit real mode into 32 bit flat protected mode
;
-; Copyright (c) 2008 - 2010, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2008 - 2022, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;------------------------------------------------------------------------------
@@ -92,7 +92,7 @@ ALIGN 16 GDT_BASE:
; null descriptor
-NULL_SEL equ $-GDT_BASE
+NULL_SEL equ $-GDT_BASE ; Selector [0x0]
DW 0 ; limit 15:0
DW 0 ; base 15:0
DB 0 ; base 23:16
@@ -100,42 +100,67 @@ NULL_SEL equ $-GDT_BASE DB 0 ; limit 19:16, flags
DB 0 ; base 31:24
+; Spare segment descriptor
+SPARE1_SEL equ $-GDT_BASE ; Selector [0x8]
+ DW 0 ; limit 15:0
+ DW 0 ; base 15:0
+ DB 0 ; base 23:16
+ DB 0 ; sys flag, dpl, type
+ DB 0 ; limit 19:16, flags
+ DB 0 ; base 31:24
+
+; linear code segment descriptor
+LINEAR_CODE_SEL equ $-GDT_BASE ; Selector [0x10]
+ DW 0xffff ; limit 15:0
+ DW 0 ; base 15:0
+ DB 0 ; base 23:16
+ DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(CODE32_TYPE) ; 09Bh
+ DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(1)|CODE64_FLAG(0)|UPPER_LIMIT(0xf) ; 0CFh
+ DB 0 ; base 31:24
+
; linear data segment descriptor
-LINEAR_SEL equ $-GDT_BASE
+LINEAR_SEL equ $-GDT_BASE ; Selector [0x18]
DW 0xffff ; limit 15:0
DW 0 ; base 15:0
DB 0 ; base 23:16
- DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(DATA32_TYPE)
- DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(1)|CODE64_FLAG(0)|UPPER_LIMIT(0xf)
+ DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(DATA32_TYPE) ; 093h
+ DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(1)|CODE64_FLAG(0)|UPPER_LIMIT(0xf) ; 0CFh
DB 0 ; base 31:24
-; linear code segment descriptor
-LINEAR_CODE_SEL equ $-GDT_BASE
+; Spare segment descriptor
+SPARE2_SEL equ $-GDT_BASE ; Selector [0x20]
+ DW 0 ; limit 15:0
+ DW 0 ; base 15:0
+ DB 0 ; base 23:16
+ DB 0 ; sys flag, dpl, type
+ DB 0 ; limit 19:16, flags
+ DB 0 ; base 31:24
+
+; linear code (16-bit) segment descriptor
+LINEAR_CODE16_SEL equ $-GDT_BASE ; Selector [0x28]
DW 0xffff ; limit 15:0
DW 0 ; base 15:0
DB 0 ; base 23:16
- DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(CODE32_TYPE)
- DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(1)|CODE64_FLAG(0)|UPPER_LIMIT(0xf)
+ DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(CODE32_TYPE) ; 09Bh
+ DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(0)|CODE64_FLAG(0)|UPPER_LIMIT(0xf) ; 08Fh
DB 0 ; base 31:24
-%ifdef ARCH_X64
-; linear code (64-bit) segment descriptor
-LINEAR_CODE64_SEL equ $-GDT_BASE
+; linear data (16-bit) segment descriptor
+LINEAR_DATA16_SEL equ $-GDT_BASE ; Selector [0x30]
DW 0xffff ; limit 15:0
DW 0 ; base 15:0
DB 0 ; base 23:16
- DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(CODE64_TYPE)
- DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(0)|CODE64_FLAG(1)|UPPER_LIMIT(0xf)
+ DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(DATA32_TYPE) ; 093h
+ DB 0
DB 0 ; base 31:24
-%endif
-; linear code segment descriptor
-LINEAR_CODE16_SEL equ $-GDT_BASE
+; linear code (64-bit) segment descriptor
+LINEAR_CODE64_SEL equ $-GDT_BASE ; Selector [0x38]
DW 0xffff ; limit 15:0
DW 0 ; base 15:0
DB 0 ; base 23:16
- DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(CODE32_TYPE)
- DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(0)|CODE64_FLAG(0)|UPPER_LIMIT(0xf)
+ DB PRESENT_FLAG(1)|DPL(0)|SYSTEM_FLAG(1)|DESC_TYPE(CODE64_TYPE) ; 09Bh
+ DB GRANULARITY_FLAG(1)|DEFAULT_SIZE32(0)|CODE64_FLAG(1)|UPPER_LIMIT(0xf) ; 0AFh
DB 0 ; base 31:24
GDT_END:
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