TITLE LongMode.asm: Assembly code for the entering long mode ;------------------------------------------------------------------------------ ;* ;* Copyright (c) 2006, Intel Corporation ;* All rights reserved. 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. ;* ;* LongMode.asm ;* ;* Abstract: ;* ;* Transition from 32-bit protected mode EFI environment into x64 ;* 64-bit bit long mode. ;* ;------------------------------------------------------------------------------ .686p .model flat ; ; Create the exception handler code in IA32 C code ; .code .stack .MMX .XMM _LoadGo64Gdt PROC Near Public push ebp ; C prolog push edi mov ebp, esp ; ; Disable interrupts ; cli ; ; Reload the selectors ; Note: ; Make the Selectors 64-bit ready ; mov edi, OFFSET gdtr ; Load GDT register mov ax,cs ; Get the selector data from our code image mov es,ax lgdt FWORD PTR es:[edi] ; and update the GDTR db 067h db 0eah ; Far Jump Offset:Selector to reload CS dd OFFSET DataSelectorRld; Offset is ensuing instruction boundary dw LINEAR_CODE_SEL ; Selector is our code selector, 10h DataSelectorRld:: mov ax, SYS_DATA_SEL ; Update the Base for the new selectors, too mov ds, ax mov es, ax mov fs, ax mov gs, ax mov ss, ax pop edi pop ebp ret _LoadGo64Gdt endp ; VOID ; ActivateLongMode ( ; IN EFI_PHYSICAL_ADDRESS PageTables, ; IN EFI_PHYSICAL_ADDRESS HobStart, ; IN EFI_PHYSICAL_ADDRESS Stack, ; IN EFI_PHYSICAL_ADDRESS PpisNeededByDxeIplEntryPoint, ; IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint ; ) ; ; Input: [ebp][0h] = Original ebp ; [ebp][4h] = Return address ; [ebp][8h] = PageTables ; [ebp][10h] = HobStart ; [ebp][18h] = Stack ; [ebp][20h] = CodeEntryPoint1 <--- Call this first (for each call, pass HOB pointer) ; [ebp][28h] = CodeEntryPoint2 <--- Call this second ; ; _ActivateLongMode PROC Near Public push ebp ; C prolog mov ebp, esp ; ; Use CPUID to determine if the processor supports long mode. ; mov eax, 80000000h ; Extended-function code 8000000h. cpuid ; Is largest extended function cmp eax, 80000000h ; any function > 80000000h? jbe no_long_mode ; If not, no long mode. mov eax, 80000001h ; Extended-function code 8000001h. cpuid ; Now EDX = extended-features flags. bt edx, 29 ; Test if long mode is supported. jnc no_long_mode ; Exit if not supported. ; ; Enable the 64-bit page-translation-table entries by ; setting CR4.PAE=1 (this is _required_ before activating ; long mode). Paging is not enabled until after long mode ; is enabled. ; mov eax, cr4 bts eax, 5 mov cr4, eax ; ; Get the long-mode page tables, and initialize the ; 64-bit CR3 (page-table base address) to point to the base ; of the PML4 page table. The PML4 page table must be located ; below 4 Gbytes because only 32 bits of CR3 are loaded when ; the processor is not in 64-bit mode. ; mov eax, [ebp+8h] ; Get Page Tables mov cr3, eax ; Initialize CR3 with PML4 base. ; ; Enable long mode (set EFER.LME=1). ; mov ecx, 0c0000080h ; EFER MSR number. rdmsr ; Read EFER. bts eax, 8 ; Set LME=1. wrmsr ; Write EFER. ; ; Enable paging to activate long mode (set CR0.PG=1) ; mov eax, cr0 ; Read CR0. bts eax, 31 ; Set PG=1. mov cr0, eax ; Write CR0. jmp go_to_long_mode go_to_long_mode: ; ; This is the next instruction after enabling paging. Jump to long mode ; db 067h db 0eah ; Far Jump Offset:Selector to reload CS dd OFFSET in_long_mode; Offset is ensuing instruction boundary dw SYS_CODE64_SEL ; Selector is our code selector, 10h in_long_mode:: mov ax, SYS_DATA64_SEL mov es, ax mov ss, ax mov ds, ax ;; jmp $ ; ; We're in long mode, so marshall the arguments to call the ; passed in function pointers ; Recall ; [ebp][10h] = HobStart ; [ebp][18h] = Stack ; [ebp][20h] = PpisNeededByDxeIplEntryPoint <--- Call this first (for each call, pass HOB pointer) ; [ebp][28h] = DxeCoreEntryPoint <--- Call this second ; db 48h mov ebx, [ebp+18h] ; Setup the stack db 48h mov esp, ebx ; On a new stack now ;; 00000905 FF D0 call rax db 48h mov ecx, [ebp+10h] ; Pass Hob Start in RCX db 48h mov eax, [ebp+28h] ; Get the function pointer for ; DxeCoreEntryPoint into EAX ;; 00000905 FF D0 call rax db 0ffh db 0d0h ; ; WE SHOULD NEVER GET HERE!!!!!!!!!!!!! ; no_long_mode: jmp no_long_mode _ActivateLongMode endp align 16 gdtr dw GDT_END - GDT_BASE - 1 ; GDT limit dd OFFSET GDT_BASE ; (GDT base gets set above) ;-----------------------------------------------------------------------------; ; global descriptor table (GDT) ;-----------------------------------------------------------------------------; align 16 public GDT_BASE GDT_BASE: ; null descriptor NULL_SEL equ $-GDT_BASE ; Selector [0] dw 0 ; limit 15:0 dw 0 ; base 15:0 db 0 ; base 23:16 db 0 ; type db 0 ; limit 19:16, flags db 0 ; base 31:24 ; linear data segment descriptor LINEAR_SEL equ $-GDT_BASE ; Selector [0x8] dw 0FFFFh ; limit 0xFFFFF dw 0 ; base 0 db 0 db 092h ; present, ring 0, data, expand-up, writable db 0CFh ; page-granular, 32-bit db 0 ; linear code segment descriptor LINEAR_CODE_SEL equ $-GDT_BASE ; Selector [0x10] dw 0FFFFh ; limit 0xFFFFF dw 0 ; base 0 db 0 db 09Fh ; present, ring 0, data, expand-up, writable db 0CFh ; page-granular, 32-bit db 0 ; system data segment descriptor SYS_DATA_SEL equ $-GDT_BASE ; Selector [0x18] dw 0FFFFh ; limit 0xFFFFF dw 0 ; base 0 db 0 db 093h ; present, ring 0, data, expand-up, writable db 0CFh ; page-granular, 32-bit db 0 ; system code segment descriptor SYS_CODE_SEL equ $-GDT_BASE ; Selector [0x20] dw 0FFFFh ; limit 0xFFFFF dw 0 ; base 0 db 0 db 09Ah ; present, ring 0, data, expand-up, writable db 0CFh ; page-granular, 32-bit db 0 ; spare segment descriptor SPARE3_SEL equ $-GDT_BASE ; Selector [0x28] dw 0 ; limit 0xFFFFF dw 0 ; base 0 db 0 db 0 ; present, ring 0, data, expand-up, writable db 0 ; page-granular, 32-bit db 0 ; ; system data segment descriptor ; SYS_DATA64_SEL equ $-GDT_BASE ; Selector [0x30] dw 0FFFFh ; limit 0xFFFFF dw 0 ; base 0 db 0 db 092h ; P | DPL [1..2] | 1 | 1 | C | R | A db 0CFh ; G | D | L | AVL | Segment [19..16] db 0 ; ; system code segment descriptor ; SYS_CODE64_SEL equ $-GDT_BASE ; Selector [0x38] dw 0FFFFh ; limit 0xFFFFF dw 0 ; base 0 db 0 db 09Ah ; P | DPL [1..2] | 1 | 1 | C | R | A db 0AFh ; G | D | L | AVL | Segment [19..16] db 0 ; spare segment descriptor SPARE4_SEL equ $-GDT_BASE ; Selector [0x40] dw 0 ; limit 0xFFFFF dw 0 ; base 0 db 0 db 0 ; present, ring 0, data, expand-up, writable db 0 ; page-granular, 32-bit db 0 GDT_END: ; ; ;------------------------------------------------------------------------------ ; Generic IDT Vector Handlers for the Host. They are all the same so they ; will compress really well. ; ; By knowing the return address for Vector 00 you can can calculate the ; vector number by looking at the call CommonInterruptEntry return address. ; (return address - AsmIdtVector00Base)/8 == IDT index ; ;------------------------------------------------------------------------------ _AsmIdtVector00 PROC NEAR PUBLIC call CommonInterruptEntry _AsmIdtVector00 ENDP AsmIdtVector00Base PROC NEAR PUBLIC nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop nop nop call CommonInterruptEntry nop 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