diff options
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bootsector-pae.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bootsector-pae.asm | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bootsector-pae.asm b/src/VBox/ValidationKit/bootsectors/bootsector-pae.asm new file mode 100644 index 00000000..ae342ba5 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bootsector-pae.asm @@ -0,0 +1,175 @@ +; $Id: bootsector-pae.asm $ +;; @file +; Bootsector that switches the CPU info PAE mode. +; + +; +; Copyright (C) 2007-2022 Oracle and/or its affiliates. +; +; This file is part of VirtualBox base platform packages, as +; available from https://www.virtualbox.org. +; +; This program is free software; you can redistribute it and/or +; modify it under the terms of the GNU General Public License +; as published by the Free Software Foundation, in version 3 of the +; License. +; +; This program is distributed in the hope that it will be useful, but +; WITHOUT ANY WARRANTY; without even the implied warranty of +; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +; General Public License for more details. +; +; You should have received a copy of the GNU General Public License +; along with this program; if not, see <https://www.gnu.org/licenses>. +; +; The contents of this file may alternatively be used under the terms +; of the Common Development and Distribution License Version 1.0 +; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included +; in the VirtualBox distribution, in which case the provisions of the +; CDDL are applicable instead of those of the GPL. +; +; You may elect to license modified versions of this file under the +; terms and conditions of either the GPL or the CDDL or both. +; +; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 +; + +%include "iprt/asmdefs.mac" +%include "iprt/x86.mac" +%include "VBox/bios.mac" + + +;; The boot sector load address. +%define BS_ADDR 0x7c00 +%define PDP_ADDR 0x9000 +%define PD_ADDR 0xa000 + + +BITS 16 +start: + ; Start with a jump just to follow the convention. + jmp short the_code + nop +times 3ah db 0 + +the_code: + cli + xor edx, edx + mov ds, dx ; Use 0 based addresses + + ; + ; Create a paging hierarchy + ; + mov cx, 4 + xor esi, esi ; physical address + mov ebx, PDP_ADDR + mov edi, PD_ADDR +pdptr_loop: + ; The page directory pointer entry. + mov dword [ebx], edi + or word [bx], X86_PDPE_P + mov dword [ebx + 4], edx + + ; The page directory. +pd_loop: + mov dword [edi], esi + or word [di], X86_PDE4M_P | X86_PDE4M_RW | X86_PDE4M_PS + mov dword [edi + 4], 0 + add esi, 0x00200000 ; 2MB + add di, 8 + test di, 0fffh + jnz pd_loop + + add bx, 8 + loop pdptr_loop + + ; + ; Switch to protected mode. + ; + lgdt [(gdtr - start) + BS_ADDR] + lidt [(idtr_null - start) + BS_ADDR] + + mov eax, PDP_ADDR + mov cr3, eax + + mov eax, cr4 + or eax, X86_CR4_PAE | X86_CR4_PSE + mov cr4, eax + + mov eax, cr0 + or eax, X86_CR0_PE | X86_CR0_PG + mov cr0, eax + jmp far 0x0008:((code32_start - start) + BS_ADDR) ; 8=32-bit CS + +BITS 32 +code32_start: + mov ax, 0x10 + mov ds, ax + mov es, ax + mov fs, ax + mov gs, ax + mov ax, 0x18 + mov es, ax + mov esp, 0x80000 + + ; eye catchers + mov eax, 0xCafeBabe + mov ebx, eax + mov ecx, eax + mov edx, eax + mov edi, eax + mov esi, eax + mov ebp, eax + + ; + ; Boch shutdown request. + ; + mov bl, 64 + mov dx, VBOX_BIOS_SHUTDOWN_PORT + mov ax, VBOX_BIOS_OLD_SHUTDOWN_PORT +retry: + mov ecx, 8 + mov esi, (szShutdown - start) + BS_ADDR + rep outsb + xchg dx, ax ; alternate between the new (VBox) and old (Bochs) ports. + dec bl + jnz retry + ; Shutdown failed! +hlt_again: + hlt + cli + jmp hlt_again + + ; + ; The GDT. + ; +align 8, db 0 +gdt: + dw 0, 0, 0, 0 ; null selector + dw 0xffff, 0, 0x9b00, 0x00cf ; 32 bit flat code segment (0x08) + dw 0xffff, 0, 0x9300, 0x00cf ; 32 bit flat data segment (0x10) + dw 0xffff, 0, 0x9300, 0x00cf ; 32 bit flat stack segment (0x18) + +gdtr: + dw 8*4-1 ; limit 15:00 + dw (gdt - start) + BS_ADDR ; base 15:00 + db 0 ; base 23:16 + db 0 ; unused + +idtr_null: + dw 0 ; limit 15:00 + dw (gdt - start) + BS_ADDR ; base 15:00 + db 0 ; base 23:16 + db 0 ; unused + +szShutdown: + db 'Shutdown', 0 + + ; + ; Padd the remainder of the sector with zeros and + ; end it with the dos signature. + ; +padding: +times 510 - (padding - start) db 0 + db 055h, 0aah + |