UefiCpuPkg PiSmmCpuDxeSmm: Convert X64/SmiEntry.asm to NASM

Manually convert X64/SmiEntry.asm to X64/SmiEntry.nasm

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
new file mode 100644 (file)
index 0000000..b717cda
--- /dev/null
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmiEntry.nasm
@@ -0,0 +1,177 @@
+;------------------------------------------------------------------------------ ;\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
+; Module Name:\r
+;\r
+;   SmiEntry.nasm\r
+;\r
+; Abstract:\r
+;\r
+;   Code template of the SMI handler for a particular processor\r
+;\r
+;-------------------------------------------------------------------------------\r
+\r
+;\r
+; Variables referrenced by C code\r
+;\r
+\r
+;\r
+; Constants relating to PROCESSOR_SMM_DESCRIPTOR\r
+;\r
+%define DSC_OFFSET 0xfb00\r
+%define DSC_GDTPTR 0x30\r
+%define DSC_GDTSIZ 0x38\r
+%define DSC_CS 14\r
+%define DSC_DS 16\r
+%define DSC_SS 18\r
+%define DSC_OTHERSEG 20\r
+;\r
+; Constants relating to CPU State Save Area\r
+;\r
+%define SSM_DR6 0xffd0\r
+%define SSM_DR7 0xffc8\r
+\r
+%define PROTECT_MODE_CS 0x8\r
+%define PROTECT_MODE_DS 0x20\r
+%define LONG_MODE_CS 0x38\r
+%define TSS_SEGMENT 0x40\r
+%define GDT_SIZE 0x50\r
+\r
+extern ASM_PFX(SmiRendezvous)\r
+extern ASM_PFX(gSmiHandlerIdtr)\r
+extern ASM_PFX(CpuSmmDebugEntry)\r
+extern ASM_PFX(CpuSmmDebugExit)\r
+\r
+global ASM_PFX(gSmbase)\r
+global ASM_PFX(gSmiStack)\r
+global ASM_PFX(gSmiCr3)\r
+global ASM_PFX(gcSmiHandlerTemplate)\r
+global ASM_PFX(gcSmiHandlerSize)\r
+\r
+    DEFAULT REL\r
+    SECTION .text\r
+\r
+BITS 16\r
+ASM_PFX(gcSmiHandlerTemplate):\r
+_SmiEntryPoint:\r
+    mov     bx, _GdtDesc - _SmiEntryPoint + 0x8000\r
+    mov     ax,[cs:DSC_OFFSET + DSC_GDTSIZ]\r
+    dec     ax\r
+    mov     [cs:bx], ax\r
+    mov     eax, [cs:DSC_OFFSET + DSC_GDTPTR]\r
+    mov     [cs:bx + 2], eax\r
+o32 lgdt    [cs:bx]                       ; lgdt fword ptr cs:[bx]\r
+    mov     ax, PROTECT_MODE_CS\r
+    mov     [cs:bx-0x2],ax    \r
+    DB      0x66, 0xbf                   ; mov edi, SMBASE\r
+ASM_PFX(gSmbase): DD 0\r
+    lea     eax, [edi + (@ProtectedMode - _SmiEntryPoint) + 0x8000]\r
+    mov     [cs:bx-0x6],eax\r
+    mov     ebx, cr0\r
+    and     ebx, 0x9ffafff3\r
+    or      ebx, 0x23\r
+    mov     cr0, ebx\r
+    jmp     dword 0x0:0x0\r
+_GdtDesc:   \r
+    DW 0\r
+    DD 0\r
+\r
+BITS 32\r
+@ProtectedMode:\r
+    mov     ax, PROTECT_MODE_DS\r
+o16 mov     ds, ax\r
+o16 mov     es, ax\r
+o16 mov     fs, ax\r
+o16 mov     gs, ax\r
+o16 mov     ss, ax\r
+    DB      0xbc                   ; mov esp, imm32\r
+ASM_PFX(gSmiStack): DD 0\r
+    jmp     ProtFlatMode\r
+\r
+BITS 64\r
+ProtFlatMode:\r
+    DB      0xb8                        ; mov eax, offset gSmiCr3\r
+ASM_PFX(gSmiCr3): DD 0\r
+    mov     cr3, rax\r
+    mov     eax, 0x668                   ; as cr4.PGE is not set here, refresh cr3\r
+    mov     cr4, rax                    ; in PreModifyMtrrs() to flush TLB.\r
+; Load TSS\r
+    sub     esp, 8                      ; reserve room in stack\r
+    sgdt    [rsp]\r
+    mov     eax, [rsp + 2]              ; eax = GDT base\r
+    add     esp, 8\r
+    mov     dl, 0x89\r
+    mov     [rax + TSS_SEGMENT + 5], dl ; clear busy flag\r
+    mov     eax, TSS_SEGMENT\r
+    ltr     ax\r
+\r
+; Switch into @LongMode\r
+    push    LONG_MODE_CS                ; push cs hardcore here\r
+    call    Base                       ; push reture address for retf later\r
+Base:\r
+    add     dword [rsp], @LongMode - Base; offset for far retf, seg is the 1st arg\r
+    mov     ecx, 0xc0000080\r
+    rdmsr\r
+    or      ah, 1\r
+    wrmsr\r
+    mov     rbx, cr0\r
+    or      ebx, 080010000h            ; enable paging + WP\r
+    mov     cr0, rbx\r
+    retf\r
+@LongMode:                              ; long mode (64-bit code) starts here\r
+    mov     rax, ASM_PFX(gSmiHandlerIdtr)\r
+    lidt    [rax]\r
+    lea     ebx, [rdi + DSC_OFFSET]\r
+    mov     ax, [rbx + DSC_DS]\r
+    mov     ds, eax\r
+    mov     ax, [rbx + DSC_OTHERSEG]\r
+    mov     es, eax\r
+    mov     fs, eax\r
+    mov     gs, eax\r
+    mov     ax, [rbx + DSC_SS]\r
+    mov     ss, eax\r
+;   jmp     _SmiHandler                 ; instruction is not needed\r
+\r
+_SmiHandler:\r
+    mov     rbx, [rsp]                  ; rbx <- CpuIndex\r
+\r
+    ;\r
+    ; Save FP registers\r
+    ;\r
+    sub     rsp, 0x208\r
+    DB      0x48                         ; FXSAVE64\r
+    fxsave  [rsp]\r
+\r
+    add     rsp, -0x20\r
+\r
+    mov     rcx, rbx\r
+    mov     rax, CpuSmmDebugEntry\r
+    call    rax\r
+    \r
+    mov     rcx, rbx\r
+    mov     rax, SmiRendezvous          ; rax <- absolute addr of SmiRedezvous\r
+    call    rax\r
+    \r
+    mov     rcx, rbx\r
+    mov     rax, CpuSmmDebugExit\r
+    call    rax\r
+    \r
+    add     rsp, 0x20\r
+\r
+    ;\r
+    ; Restore FP registers\r
+    ;\r
+    DB      0x48                         ; FXRSTOR64\r
+    fxrstor [rsp]\r
+\r
+    rsm\r
+\r
+gcSmiHandlerSize    DW      $ - _SmiEntryPoint\r
+\r