Minor grammatical work--mostly adding periods. Items with ONLY period added did...

[mirror_edk2.git] / MdePkg / Library / BaseLib / X64 / DisablePaging64.S

diff --git a/MdePkg/Library/BaseLib/X64/DisablePaging64.S b/MdePkg/Library/BaseLib/X64/DisablePaging64.S
index 41d6a6f5d7791c113ac8643f5ec35d0d65300d26..676e9e175a7fae5aa5f18b867f6fb5ba8bd73c64 100644 (file)
--- a/MdePkg/Library/BaseLib/X64/DisablePaging64.S
+++ b/MdePkg/Library/BaseLib/X64/DisablePaging64.S
@@ -1,10 +1,10 @@
 #------------------------------------------------------------------------------\r
 #\r
-# Copyright (c) 2006 - 2008, Intel Corporation\r
-# All rights reserved. This program and the accompanying materials\r
+# Copyright (c) 2006 - 2009, 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
+# 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
@@ -37,33 +37,36 @@
 \r
 ASM_GLOBAL ASM_PFX(InternalX86DisablePaging64)\r
 ASM_PFX(InternalX86DisablePaging64):\r
-    cli    
-    lea    L1(%rip), %rsi                 # rsi <- The start address of transition code
-    mov    0x28(%rsp), %edi               # rdi <- New stack
-    sub    $64, %edi                      # rdi <- use 64 byte in stack to hold transition code  
-    mov    %edi, %r10d                    # r10 <- The start address of transicition code below 4G
-    lea    _mTransitionEnd(%rip), %rax    # rax <- end of transition code
-    sub    %rsi, %rax                     # rax <- The size of transition piece code
-    push   %rcx                           # save rcx to stack
-    mov    %rax, %rcx                     # rcx <- The size of transition piece code
-    rep
-    movsb                                 # copy transition code to (new stack - 64byte) below 4G
-    pop    %rcx                           # restore rcx
+    cli    \r
+    lea    L1(%rip), %rsi                 # rsi <- The start address of transition code\r
+    mov    0x28(%rsp), %edi               # rdi <- New stack\r
+    lea    _mTransitionEnd(%rip), %rax    # rax <- end of transition code\r
+    sub    %rsi, %rax                     # rax <- The size of transition piece code\r
+    add    $4, %rax                       # round rax up to the next 4 byte boundary\r
+    and    $0xfc, %al\r
+    sub    %rax, %rdi                     # rdi <- use stack to hold transition code \r
+    mov    %edi, %r10d                    # r10 <- The start address of transicition code below 4G\r
+    push   %rcx                           # save rcx to stack\r
+    mov    %rax, %rcx                     # rcx <- The size of transition piece code\r
+    rep\r
+    movsb                                 # copy transition code to (new stack - 64byte) below 4G\r
+    pop    %rcx                           # restore rcx\r
    \r
     mov    %r8d, %esi \r
     mov    %r9d, %edi \r
-    mov    0x28(%rsp), %eax               # eax <- New Stack\r
+    mov    %r10d, %eax\r
+    sub    $4, %eax\r
     push   %rcx                           # push Cs to stack\r
-    push   %r10\r
+    push   %r10                           # push address of transition code on stack  \r
     .byte  0x48, 0xcb                     # retq: Use far return to load CS register from stack\r
                                           # (Use raw byte code since some GNU assemblers generates incorrect code for "retq")  \r
 L1:\r
     mov    %eax,%esp                      # set up new stack\r
     mov    %cr0,%rax\r
-    btr    $0x1f,%eax\r
+    btr    $0x1f,%eax                     # clear CR0.PG\r
     mov    %rax,%cr0                      # disable paging\r
 \r
-    mov    %rdx,%rbx                      # save EntryPoint to rbx, for rdmsr will overwrite rdx\r
+    mov    %edx,%ebx                      # save EntryPoint to ebx, for rdmsr will overwrite edx\r
     mov    $0xc0000080,%ecx\r
     rdmsr  \r
     and    $0xfe,%ah                      # clear LME\r
@@ -75,4 +78,5 @@ L1:
     push   %rsi                           # push Context1\r
     callq  *%rbx                          # transfer control to EntryPoint\r
     jmp    .                              # no one should get here\r
-\r_mTransitionEnd :
+\r
+_mTransitionEnd :\r