diff options
Diffstat (limited to 'BraswellPlatformPkg/Common/Silicon/IntelSiliconBasic/PiSmmCpuDxeSmm/Ia32/SmiEntry.S')
| -rw-r--r-- | BraswellPlatformPkg/Common/Silicon/IntelSiliconBasic/PiSmmCpuDxeSmm/Ia32/SmiEntry.S | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/BraswellPlatformPkg/Common/Silicon/IntelSiliconBasic/PiSmmCpuDxeSmm/Ia32/SmiEntry.S b/BraswellPlatformPkg/Common/Silicon/IntelSiliconBasic/PiSmmCpuDxeSmm/Ia32/SmiEntry.S new file mode 100644 index 0000000000..f2f81a1991 --- /dev/null +++ b/BraswellPlatformPkg/Common/Silicon/IntelSiliconBasic/PiSmmCpuDxeSmm/Ia32/SmiEntry.S @@ -0,0 +1,153 @@ +## @file
+# Code template of the SMI handler for a particular processor
+#
+# Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution. The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php.
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED
+#
+##
+
+
+ASM_GLOBAL ASM_PFX(gcSmiHandlerTemplate)
+ASM_GLOBAL ASM_PFX(gcSmiHandlerSize)
+ASM_GLOBAL ASM_PFX(gSmiCr3)
+ASM_GLOBAL ASM_PFX(gcSmiHandlerOffset)
+ASM_GLOBAL ASM_PFX(gSmiStack)
+ASM_GLOBAL ASM_PFX(gSmbase)
+ASM_GLOBAL ASM_PFX(FeaturePcdGet (PcdCpuSmmDebug))
+ASM_GLOBAL ASM_PFX(FeaturePcdGet (PcdCpuSmmStackGuard))
+
+.equ DSC_OFFSET, 0xfb00
+.equ DSC_GDTPTR, 0x30
+.equ DSC_GDTSIZ, 0x38
+.equ DSC_CS, 14
+.equ DSC_DS, 16
+.equ DSC_SS, 18
+.equ DSC_OTHERSEG, 20
+
+.equ MSR_DR6, 0x0c05
+.equ MSR_DR7, 0x0c06
+
+.equ TSS_SEGMENT, 0x40
+
+ .data
+
+ ASM_PFX(gcSmiHandlerOffset): .word _SmiHandler - _SmiEntryPoint + 0x8000
+
+ .text
+
+ASM_PFX(gcSmiHandlerTemplate):
+
+_SmiEntryPoint:
+ .byte 0xbb # mov bx, imm16
+ .word _GdtDesc - _SmiEntryPoint + 0x8000
+ .byte 0x2e,0xa1 # mov ax, cs:[offset16]
+ .word DSC_OFFSET + DSC_GDTSIZ
+ decl %eax
+ movl %eax, %cs:(%edi) # mov cs:[bx], ax
+ .byte 0x66,0x2e,0xa1 # mov eax, cs:[offset16]
+ .word DSC_OFFSET + DSC_GDTPTR
+ movw %ax, %cs:2(%edi)
+ movw %ax, %bp # ebp = GDT base
+ .byte 0x66
+ lgdt %cs:(%edi)
+ .byte 0x66,0xb8 # mov eax, imm32
+ASM_PFX(gSmiCr3): .space 4
+ movl %eax, %cr3
+ .byte 0x66
+ movl $0x668,%eax # as cr4.PGE is not set here, refresh cr3
+ movl %eax, %cr4 # in PreModifyMtrrs() to flush TLB.
+ .byte 0x2e,0xa1 # mov ax, cs:[offset16]
+ .word DSC_OFFSET + DSC_CS
+ movl %eax, %cs:-2(%edi)
+ .byte 0x66, 0xbf # mov edi, SMBASE
+ASM_PFX(gSmbase): .space 4
+ .byte 0x67
+ lea ((Start32bit - _SmiEntryPoint) + 0x8000)(%edi), %ax
+ movw %ax, %cs:-6(%edi)
+ movl %cr0, %ebx
+ .byte 0x66
+ andl $0x9ffafff3, %ebx
+ .byte 0x66
+ orl $0x80000023, %ebx
+ movl %ebx, %cr0
+ .byte 0x66,0xea
+ .space 4
+ .space 2
+_GdtDesc: .space 4
+ .space 2
+Start32bit:
+ leal DSC_OFFSET(%edi),%ebx
+ movw DSC_DS(%ebx),%ax
+ movl %eax,%ds
+ movw DSC_OTHERSEG(%ebx),%ax
+ movl %eax,%es
+ movl %eax,%fs
+ movl %eax,%gs
+ movw DSC_SS(%ebx),%ax
+ movl %eax,%ss
+
+ cmpb $0, ASM_PFX(FeaturePcdGet (PcdCpuSmmStackGuard))
+ jz L5
+
+# Load TSS
+ movb $0x89, (TSS_SEGMENT + 5)(%ebp) # clear busy flag
+
+ movl $TSS_SEGMENT, %eax
+ ltrw %ax
+L5:
+
+# jmp _SmiHandler # instruction is not needed
+
+_SmiHandler:
+ .byte 0xbc # mov esp, imm32
+ASM_PFX(gSmiStack): .space 4
+ cmpb $0, ASM_PFX(FeaturePcdGet (PcdCpuSmmDebug))
+ jz L3
+ jz L6
+
+L6:
+ call L1
+L1:
+ popl %ebp
+ movl $0x80000001, %eax
+ cpuid
+ btl $29, %edx # check cpuid to identify X64 or IA32
+ leal (0x7fc8 - (L1 - _SmiEntryPoint))(%ebp), %edi
+ leal 4(%edi), %esi
+ jnc L2
+ addl $4, %esi
+L2:
+ movl (%esi), %ecx
+ movl (%edi), %edx
+L7:
+ movl %ecx, %dr6
+ movl %edx, %dr7 # restore DR6 & DR7 before running C code
+L3:
+
+ pushl (%esp)
+
+ movl $ASM_PFX(SmiRendezvous), %eax
+ call *%eax
+ popl %ecx
+
+
+ cmpb $0, ASM_PFX(FeaturePcdGet (PcdCpuSmmDebug))
+ jz L4
+
+ movl %dr6, %ecx
+ movl %dr7, %edx
+ movl %ecx, (%esi)
+ movl %edx, (%edi)
+L4:
+
+ rsm
+
+ASM_PFX(gcSmiHandlerSize): .word . - _SmiEntryPoint
+
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