UefiCpuPkg: Move AsmRelocateApLoopStart from Mpfuncs.nasm to AmdSev.nasm

[mirror_edk2.git] / UefiCpuPkg / CpuDxe / CpuGdt.c

diff --git a/UefiCpuPkg/CpuDxe/CpuGdt.c b/UefiCpuPkg/CpuDxe/CpuGdt.c
index 35a87a6e453e8bcf85a993df18c678d6c76c9978..cf571138e5768913b8e74b3d7492b5e50b6adbc9 100644 (file)
--- a/UefiCpuPkg/CpuDxe/CpuGdt.c
+++ b/UefiCpuPkg/CpuDxe/CpuGdt.c
@@ -1,15 +1,9 @@
 /** @file\r
-  C based implemention of IA32 interrupt handling only\r
+  C based implementation of IA32 interrupt handling only\r
   requiring a minimal assembly interrupt entry point.\r
 \r
-  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>\r
-  This program and the accompanying materials\r
-  are licensed and made available under the terms and conditions of the BSD License\r
-  which accompanies this distribution.  The full text of the license may be found at\r
-  http://opensource.org/licenses/bsd-license.php\r
-\r
-  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
-  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+  Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>\r
+  SPDX-License-Identifier: BSD-2-Clause-Patent\r
 \r
 **/\r
 \r
@@ -19,7 +13,7 @@
 //\r
 // Global descriptor table (GDT) Template\r
 //\r
-STATIC GDT_ENTRIES GdtTemplate = {\r
+STATIC GDT_ENTRIES  mGdtTemplate = {\r
   //\r
   // NULL_SEL\r
   //\r
@@ -35,10 +29,10 @@ STATIC GDT_ENTRIES GdtTemplate = {
   // LINEAR_SEL\r
   //\r
   {\r
-    0x0FFFF,        // limit 0xFFFFF\r
-    0x0,            // base 0\r
-    0x0,\r
-    0x092,          // present, ring 0, data, expand-up, writable\r
+    0x0FFFF,        // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x092,          // present, ring 0, data, read/write\r
     0x0CF,          // page-granular, 32-bit\r
     0x0,\r
   },\r
@@ -46,10 +40,10 @@ STATIC GDT_ENTRIES GdtTemplate = {
   // LINEAR_CODE_SEL\r
   //\r
   {\r
-    0x0FFFF,        // limit 0xFFFFF\r
-    0x0,            // base 0\r
-    0x0,\r
-    0x09A,          // present, ring 0, data, expand-up, writable\r
+    0x0FFFF,        // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x09F,          // present, ring 0, code, execute/read, conforming, accessed\r
     0x0CF,          // page-granular, 32-bit\r
     0x0,\r
   },\r
@@ -57,10 +51,10 @@ STATIC GDT_ENTRIES GdtTemplate = {
   // SYS_DATA_SEL\r
   //\r
   {\r
-    0x0FFFF,        // limit 0xFFFFF\r
-    0x0,            // base 0\r
-    0x0,\r
-    0x092,          // present, ring 0, data, expand-up, writable\r
+    0x0FFFF,        // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x093,          // present, ring 0, data, read/write, accessed\r
     0x0CF,          // page-granular, 32-bit\r
     0x0,\r
   },\r
@@ -68,45 +62,56 @@ STATIC GDT_ENTRIES GdtTemplate = {
   // SYS_CODE_SEL\r
   //\r
   {\r
-    0x0FFFF,        // limit 0xFFFFF\r
-    0x0,            // base 0\r
-    0x0,\r
-    0x09A,          // present, ring 0, data, expand-up, writable\r
+    0x0FFFF,        // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x09A,          // present, ring 0, code, execute/read\r
     0x0CF,          // page-granular, 32-bit\r
     0x0,\r
   },\r
   //\r
-  // LINEAR_CODE64_SEL\r
+  // SYS_CODE16_SEL\r
   //\r
   {\r
-    0x0FFFF,        // limit 0xFFFFF\r
-    0x0,            // base 0\r
-    0x0,\r
-    0x09B,          // present, ring 0, code, expand-up, writable\r
-    0x0AF,          // LimitHigh (CS.L=1, CS.D=0)\r
-    0x0,            // base (high)\r
+    0x0FFFF,        // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x09A,          // present, ring 0, code, execute/read\r
+    0x08F,          // page-granular, 16-bit\r
+    0x0,            // base 31:24\r
   },\r
   //\r
-  // SPARE4_SEL\r
+  // LINEAR_DATA64_SEL\r
   //\r
   {\r
-    0x0,            // limit 0\r
-    0x0,            // base 0\r
-    0x0,\r
-    0x0,            // present, ring 0, data, expand-up, writable\r
-    0x0,            // page-granular, 32-bit\r
+    0x0FFFF,        // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x092,          // present, ring 0, data, read/write\r
+    0x0CF,          // page-granular, 32-bit\r
     0x0,\r
   },\r
   //\r
+  // LINEAR_CODE64_SEL\r
+  //\r
+  {\r
+    0x0FFFF,        // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x09A,          // present, ring 0, code, execute/read\r
+    0x0AF,          // page-granular, 64-bit code\r
+    0x0,            // base (high)\r
+  },\r
+  //\r
   // SPARE5_SEL\r
   //\r
   {\r
-    0x0,            // limit 0\r
-    0x0,            // base 0\r
-    0x0,\r
-    0x0,            // present, ring 0, data, expand-up, writable\r
-    0x0,            // page-granular, 32-bit\r
-    0x0,\r
+    0x0,            // limit 15:0\r
+    0x0,            // base 15:0\r
+    0x0,            // base 23:16\r
+    0x0,            // type\r
+    0x0,            // limit 19:16, flags\r
+    0x0,            // base 31:24\r
   },\r
 };\r
 \r
@@ -119,27 +124,38 @@ InitGlobalDescriptorTable (
   VOID\r
   )\r
 {\r
-  GDT_ENTRIES *gdt;\r
-  IA32_DESCRIPTOR gdtPtr;\r
+  EFI_STATUS            Status;\r
+  GDT_ENTRIES           *Gdt;\r
+  IA32_DESCRIPTOR       Gdtr;\r
+  EFI_PHYSICAL_ADDRESS  Memory;\r
 \r
   //\r
-  // Allocate Runtime Data for the GDT\r
-  //\r
-  gdt = AllocateRuntimePool (sizeof (GdtTemplate) + 8);\r
-  ASSERT (gdt != NULL);\r
-  gdt = ALIGN_POINTER (gdt, 8);\r
+  // Allocate Runtime Data below 4GB for the GDT\r
+  // AP uses the same GDT when it's waken up from real mode so\r
+  // the GDT needs to be below 4GB.\r
+  //\r
+  Memory = SIZE_4GB - 1;\r
+  Status = gBS->AllocatePages (\r
+                  AllocateMaxAddress,\r
+                  EfiRuntimeServicesData,\r
+                  EFI_SIZE_TO_PAGES (sizeof (mGdtTemplate)),\r
+                  &Memory\r
+                  );\r
+  ASSERT_EFI_ERROR (Status);\r
+  ASSERT ((Memory != 0) && (Memory < SIZE_4GB));\r
+  Gdt = (GDT_ENTRIES *)(UINTN)Memory;\r
 \r
   //\r
   // Initialize all GDT entries\r
   //\r
-  CopyMem (gdt, &GdtTemplate, sizeof (GdtTemplate));\r
+  CopyMem (Gdt, &mGdtTemplate, sizeof (mGdtTemplate));\r
 \r
   //\r
   // Write GDT register\r
   //\r
-  gdtPtr.Base = (UINT32)(UINTN)(VOID*) gdt;\r
-  gdtPtr.Limit = (UINT16) (sizeof (GdtTemplate) - 1);\r
-  AsmWriteGdtr (&gdtPtr);\r
+  Gdtr.Base  = (UINT32)(UINTN)Gdt;\r
+  Gdtr.Limit = (UINT16)(sizeof (mGdtTemplate) - 1);\r
+  AsmWriteGdtr (&Gdtr);\r
 \r
   //\r
   // Update selector (segment) registers base on new GDT\r
@@ -147,4 +163,3 @@ InitGlobalDescriptorTable (
   SetCodeSelector ((UINT16)CPU_CODE_SEL);\r
   SetDataSelectors ((UINT16)CPU_DATA_SEL);\r
 }\r
-\r