+++ /dev/null
-#------------------------------------------------------------------------------\r
-#\r
-# Copyright (c) 2009 - 2017, 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.S\r
-#\r
-# Abstract:\r
-#\r
-# Code template of the SMI handler for a particular processor\r
-#\r
-#------------------------------------------------------------------------------\r
-\r
-ASM_GLOBAL ASM_PFX(gcSmiHandlerTemplate)\r
-ASM_GLOBAL ASM_PFX(gcSmiHandlerSize)\r
-ASM_GLOBAL ASM_PFX(gSmiCr3)\r
-ASM_GLOBAL ASM_PFX(gSmiStack)\r
-ASM_GLOBAL ASM_PFX(gSmbase)\r
-ASM_GLOBAL ASM_PFX(mXdSupported)\r
-ASM_GLOBAL ASM_PFX(FeaturePcdGet (PcdCpuSmmStackGuard))\r
-ASM_GLOBAL ASM_PFX(gSmiHandlerIdtr)\r
-\r
-.equ MSR_IA32_MISC_ENABLE, 0x1A0\r
-.equ MSR_EFER, 0xc0000080\r
-.equ MSR_EFER_XD, 0x800\r
-\r
-#\r
-# Constants relating to PROCESSOR_SMM_DESCRIPTOR\r
-#\r
-.equ DSC_OFFSET, 0xfb00\r
-.equ DSC_GDTPTR, 0x30\r
-.equ DSC_GDTSIZ, 0x38\r
-.equ DSC_CS, 14\r
-.equ DSC_DS, 16\r
-.equ DSC_SS, 18\r
-.equ DSC_OTHERSEG, 20\r
-\r
-.equ PROTECT_MODE_CS, 0x08\r
-.equ PROTECT_MODE_DS, 0x20\r
-.equ TSS_SEGMENT, 0x40\r
-\r
- .text\r
-\r
-ASM_PFX(gcSmiHandlerTemplate):\r
-\r
-_SmiEntryPoint:\r
- .byte 0xbb # mov bx, imm16\r
- .word _GdtDesc - _SmiEntryPoint + 0x8000\r
- .byte 0x2e,0xa1 # mov ax, cs:[offset16]\r
- .word DSC_OFFSET + DSC_GDTSIZ\r
- decl %eax\r
- movl %eax, %cs:(%edi) # mov cs:[bx], ax\r
- .byte 0x66,0x2e,0xa1 # mov eax, cs:[offset16]\r
- .word DSC_OFFSET + DSC_GDTPTR\r
- movw %ax, %cs:2(%edi)\r
- movw %ax, %bp # ebp = GDT base\r
- .byte 0x66\r
- lgdt %cs:(%edi)\r
-# Patch ProtectedMode Segment\r
- .byte 0xb8 # mov ax, imm16\r
- .word PROTECT_MODE_CS # set AX for segment directly\r
- movl %eax, %cs:-2(%edi) # mov cs:[bx - 2], ax\r
-# Patch ProtectedMode entry\r
- .byte 0x66, 0xbf # mov edi, SMBASE\r
-ASM_PFX(gSmbase): .space 4\r
- .byte 0x67\r
- lea ((Start32bit - _SmiEntryPoint) + 0x8000)(%edi), %ax\r
- movw %ax, %cs:-6(%edi)\r
- movl %cr0, %ebx\r
- .byte 0x66\r
- andl $0x9ffafff3, %ebx\r
- .byte 0x66\r
- orl $0x23, %ebx\r
- movl %ebx, %cr0\r
- .byte 0x66,0xea\r
- .space 4\r
- .space 2\r
-_GdtDesc: .space 4\r
- .space 2\r
-\r
-Start32bit:\r
- movw $PROTECT_MODE_DS, %ax\r
- movl %eax,%ds\r
- movl %eax,%es\r
- movl %eax,%fs\r
- movl %eax,%gs\r
- movl %eax,%ss\r
- .byte 0xbc # mov esp, imm32\r
-ASM_PFX(gSmiStack): .space 4\r
- movl $ASM_PFX(gSmiHandlerIdtr), %eax\r
- lidt (%eax)\r
- jmp ProtFlatMode\r
-\r
-ProtFlatMode:\r
- .byte 0xb8 # mov eax, imm32\r
-ASM_PFX(gSmiCr3): .space 4\r
- movl %eax, %cr3\r
-#\r
-# Need to test for CR4 specific bit support\r
-#\r
- movl $1, %eax\r
- cpuid # use CPUID to determine if specific CR4 bits are supported\r
- xorl %eax, %eax # Clear EAX\r
- testl $BIT2, %edx # Check for DE capabilities\r
- jz L8\r
- orl $BIT3, %eax\r
-L8:\r
- testl $BIT6, %edx # Check for PAE capabilities\r
- jz L9\r
- orl $BIT5, %eax\r
-L9:\r
- testl $BIT7, %edx # Check for MCE capabilities\r
- jz L10\r
- orl $BIT6, %eax\r
-L10:\r
- testl $BIT24, %edx # Check for FXSR capabilities\r
- jz L11\r
- orl $BIT9, %eax\r
-L11:\r
- testl $BIT25, %edx # Check for SSE capabilities\r
- jz L12\r
- orl $BIT10, %eax\r
-L12: # as cr4.PGE is not set here, refresh cr3\r
- movl %eax, %cr4 # in PreModifyMtrrs() to flush TLB.\r
-\r
- cmpb $0, ASM_PFX(FeaturePcdGet (PcdCpuSmmStackGuard))\r
- jz L5\r
-# Load TSS\r
- movb $0x89, (TSS_SEGMENT + 5)(%ebp) # clear busy flag\r
- movl $TSS_SEGMENT, %eax\r
- ltrw %ax\r
-L5:\r
-\r
-# enable NXE if supported\r
- .byte 0xb0 # mov al, imm8\r
-ASM_PFX(mXdSupported): .byte 1\r
- cmpb $0, %al\r
- jz SkipNxe\r
-#\r
-# Check XD disable bit\r
-#\r
- movl $MSR_IA32_MISC_ENABLE, %ecx\r
- rdmsr\r
- pushl %edx # save MSR_IA32_MISC_ENABLE[63-32]\r
- testl $BIT2, %edx # MSR_IA32_MISC_ENABLE[34]\r
- jz L13\r
- andw $0x0FFFB, %dx # clear XD Disable bit if it is set\r
- wrmsr\r
-L13:\r
- movl $MSR_EFER, %ecx\r
- rdmsr\r
- orw $MSR_EFER_XD,%ax # enable NXE\r
- wrmsr\r
- jmp NxeDone\r
-SkipNxe:\r
- subl $4, %esp\r
-NxeDone:\r
-\r
- movl %cr0, %ebx\r
- orl $0x080010023, %ebx # enable paging + WP + NE + MP + PE\r
- movl %ebx, %cr0\r
- leal DSC_OFFSET(%edi),%ebx\r
- movw DSC_DS(%ebx),%ax\r
- movl %eax, %ds\r
- movw DSC_OTHERSEG(%ebx),%ax\r
- movl %eax, %es\r
- movl %eax, %fs\r
- movl %eax, %gs\r
- movw DSC_SS(%ebx),%ax\r
- movl %eax, %ss\r
-\r
-# jmp _SmiHandler # instruction is not needed\r
-\r
-_SmiHandler:\r
- movl 4(%esp), %ebx\r
-\r
- pushl %ebx\r
- movl $ASM_PFX(CpuSmmDebugEntry), %eax\r
- call *%eax\r
- addl $4, %esp\r
-\r
- pushl %ebx\r
- movl $ASM_PFX(SmiRendezvous), %eax\r
- call *%eax\r
- addl $4, %esp\r
-\r
- pushl %ebx\r
- movl $ASM_PFX(CpuSmmDebugExit), %eax\r
- call *%eax\r
- addl $4, %esp\r
-\r
- movl $ASM_PFX(mXdSupported), %eax\r
- movb (%eax), %al\r
- cmpb $0, %al\r
- jz L16\r
- popl %edx # get saved MSR_IA32_MISC_ENABLE[63-32]\r
- testl $BIT2, %edx\r
- jz L16\r
- movl $MSR_IA32_MISC_ENABLE, %ecx\r
- rdmsr\r
- orw $BIT2, %dx # set XD Disable bit if it was set before entering into SMM\r
- wrmsr\r
-\r
-L16:\r
- rsm\r
-\r
-ASM_PFX(gcSmiHandlerSize): .word . - _SmiEntryPoint\r
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