UefiCpuPkg CpuDxe: Add nasm source file in CpuDxe.inf

[mirror_edk2.git] / UefiCpuPkg / CpuDxe / X64 / CpuAsm.nasm

diff --git a/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm b/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm
new file mode 100644 (file)
index 0000000..77ecfb3
--- /dev/null
+++ b/UefiCpuPkg/CpuDxe/X64/CpuAsm.nasm
@@ -0,0 +1,52 @@
+;------------------------------------------------------------------------------\r
+;*\r
+;*   Copyright (c) 2016, 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
+;*\r
+;*    CpuAsm.nasm\r
+;*\r
+;*   Abstract:\r
+;*\r
+;------------------------------------------------------------------------------\r
+\r
+    DEFAULT REL\r
+    SECTION .text\r
+\r
+;------------------------------------------------------------------------------\r
+; VOID\r
+; SetCodeSelector (\r
+;   UINT16 Selector\r
+;   );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(SetCodeSelector)\r
+ASM_PFX(SetCodeSelector):\r
+    sub     rsp, 0x10\r
+    lea     rax, [setCodeSelectorLongJump]\r
+    mov     [rsp], rax\r
+    mov     [rsp+4], cx\r
+    jmp     dword far [rsp]\r
+setCodeSelectorLongJump:\r
+    add     rsp, 0x10\r
+    ret\r
+\r
+;------------------------------------------------------------------------------\r
+; VOID\r
+; SetDataSelectors (\r
+;   UINT16 Selector\r
+;   );\r
+;------------------------------------------------------------------------------\r
+global ASM_PFX(SetDataSelectors)\r
+ASM_PFX(SetDataSelectors):\r
+o16 mov     ss, cx\r
+o16 mov     ds, cx\r
+o16 mov     es, cx\r
+o16 mov     fs, cx\r
+o16 mov     gs, cx\r
+    ret\r
+\r