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Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bootsector2-cpu-a20-1.asm')
| -rw-r--r-- | src/VBox/ValidationKit/bootsectors/bootsector2-cpu-a20-1.asm | 386 |
1 files changed, 386 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-a20-1.asm b/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-a20-1.asm new file mode 100644 index 00000000..2b1aef60 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bootsector2-cpu-a20-1.asm @@ -0,0 +1,386 @@ +; $Id: bootsector2-cpu-a20-1.asm $ +;; @file +; Bootsector that checks the A20 emulation. +; + +; +; Copyright (C) 2007-2023 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/VMMDevTesting.mac" + +; +; Include and execute the init code. +; +%define BS2_WITH_TRAPS +%define BS2_INIT_RM +%define BS2_INC_PE16 +%define BS2_INC_PE32 +%define BS2_INC_PP32 +%define BS2_INC_PAE32 +%define BS2_INC_LM64 +%include "bootsector2-common-init-code.mac" + + +; +; The benchmark driver +; +BEGINPROC main + ; + ; Test prologue. + ; + mov ax, .s_szTstName + call TestInit_r86 + + ; + ; The actual tests. + ; + call TestA20_1 ; must come first + call TestA20_rm_rm + ;call TestA20_rm_pe16 + call TestA20_rm_pe32 + call TestA20_rm_pp32 + ;call TestA20_rm_pp16 + call TestA20_rm_pae32 + call TestA20_rm_lm64 + + ; + ; We're done. + ; + call TestTerm_r86 + call Bs2Panic + +.s_szTstName: + db 'tstA20-1', 0 +.s_szInitialA20Status: + db 'Initial A20 state', 0 +ENDPROC main + + +; +; Do some initial tests. +; +BEGINPROC TestA20_1 + push eax + push edx + push ecx + push ebx + push edi + + ; + ; Check that the A20 gate is disabled when we come from the BIOS. + ; + mov ax, .s_szInitialA20Status + call TestSub_r86 + + call IsA20GateEnabled_rm + mov di, ax ; save A20 state in AX for bios test. + cmp al, 0 + je .initial_state_done + mov ax, .s_szBadInitialA20Status + call TestFailed_r86 + jmp .initial_state_done +.s_szInitialA20Status: + db 'Initial A20 state', 0 +.s_szBadInitialA20Status: + db 'Initial A20 state is enabled, expected disabled', 10, 13, 0 +.initial_state_done: + call TestSubDone_r86 + + ; + ; Disable it via the BIOS interface and check. + ; + mov ax, .s_szBios + call TestSub_r86 + + ; query support + mov ax, 2403h + int 15h + jnc .bios_2403_ok + movzx edx, ax + mov ax, .s_szBios2403Error + mov cl, VMMDEV_TESTING_UNIT_NONE + call TestValueU32_r86 + jmp .bios_2403_done +.bios_2403_ok: + movzx edx, al + mov ax, .s_szBios2403Mask + mov cl, VMMDEV_TESTING_UNIT_NONE + call TestValueU32_r86 +.bios_2403_done: + + ; Check what the bios thinks the state is. + call BiosIsA20GateEnabled_rm + cmp ax, di + je .bios_2402_done + push di + push ax + push word ds + push word .s_szBios2402Error + call TestFailedF_r86 + add sp, 8 +.bios_2402_done: + + ; Loop to make sure we get all transitions and ends up with A20 disabled. + mov cx, 10h +.bios_loop: + ; enable it + mov ax, 2401h + push cx ; paranoia that seems necessary for at least one AMI bios. + int 15h + pop cx + jnc .bios_continue1 + mov ax, .s_szBiosFailed2401 + jmp .bios_failed +.bios_continue1: + + call IsA20GateEnabled_rm + cmp al, 1 + je .bios_continue2 + mov ax, .s_szBiosEnableFailed + jmp .bios_failed +.bios_continue2: + + ; disable + mov ax, 2400h + push cx ; paranoia that seems necessary for at least one AMI bios. + int 15h + pop cx + jnc .bios_continue3 + mov ax, .s_szBiosFailed2400 + jmp .bios_failed +.bios_continue3: + call IsA20GateEnabled_rm + cmp al, 0 + je .bios_continue4 + mov ax, .s_szBiosDisableFailed + jmp .bios_failed +.bios_continue4: + + loop .bios_loop + jmp .bios_done +.s_szBios: + db 'INT 15h AH=24 A20 Gate interface', 0 +.s_szBios2403Mask: + db 'AX=2403 return (AL)', 0 +.s_szBios2403Error: + db 'AX=2403 error (AX)', 10, 13, 0 +.s_szBios2402Error: + db '2402h -> AX=%RX16 expected %RX16', 10, 13, 0 +.s_szBiosFailed2400: + db '2400h interface failed', 10, 13, 0 +.s_szBiosFailed2401: + db '2401h interface failed', 10, 13, 0 +.s_szBiosDisableFailed: + db 'BIOS failed to disable A20 (or bad CPU)', 10, 13, 0 +.s_szBiosEnableFailed: + db 'BIOS failed to enable A20', 10, 13, 0 +.bios_failed: + call TestFailed_r86 +.bios_done: + call TestSubDone_r86 + call Bs2DisableA20ViaPortA_r86 + call Bs2DisableA20ViaKbd_r86 + + ; + ; Test the fast A20 gate interface. + ; + mov ax, .s_szFastA20 + call TestSub_r86 + + mov cx, 10h +.fast_loop: + call Bs2EnableA20ViaPortA_r86 + call IsA20GateEnabled_rm + cmp al, 1 + mov ax, .s_szFastEnableFailed + jne .fast_failed + + call Bs2DisableA20ViaPortA_r86 + call IsA20GateEnabled_rm + cmp al, 0 + mov ax, .s_szFastDisableFailed + jne .fast_failed + loop .fast_loop + + jmp .fast_done +.s_szFastA20: + db 'Fast A20 Gate Interface', 0 +.s_szFastDisableFailed: + db 'Fast A20 gate disabling failed', 10, 13, 0 +.s_szFastEnableFailed: + db 'Fast A20 gate enabling failed', 10, 13, 0 +.fast_failed: + call TestFailed_r86 +.fast_done: + call TestSubDone_r86 + call Bs2DisableA20ViaPortA_r86 + call Bs2DisableA20ViaKbd_r86 + + ; + ; Test the keyboard interface. + ; + mov ax, .s_szKeyboardA20 + call TestSub_r86 + + mov cx, 10h +.kbd_loop: + call Bs2EnableA20ViaKbd_r86 + call IsA20GateEnabled_rm + cmp al, 1 + mov ax, .s_szKbdEnableFailed + jne .kbd_failed + + call Bs2DisableA20ViaKbd_r86 + call IsA20GateEnabled_rm + cmp al, 0 + mov ax, .s_szKbdDisableFailed + jne .kbd_failed + loop .kbd_loop + + jmp .kbd_done +.s_szKeyboardA20: + db 'Keyboard A20 Gate Interface', 0 +.s_szKbdDisableFailed: + db 'Disabling the A20 gate via the keyboard controller failed', 10, 13, 0 +.s_szKbdEnableFailed: + db 'Enabling the A20 gate via the keyboard controller failed', 10, 13, 0 +.kbd_failed: + call TestFailed_r86 +.kbd_done: + call TestSubDone_r86 + call Bs2DisableA20ViaPortA_r86 + call Bs2DisableA20ViaKbd_r86 + + pop edi + pop ebx + pop ecx + pop edx + pop eax + ret +ENDPROC TestA20_1 + + +;; +; Checks if the A20 gate is enabled. +; +; This is do by temporarily changing a word at address 0000000h and see if this +; is reflected at address 0100000h (1 MB). The word written is +; ~*(word *)0x100000h to make sure it won't accidentally match. +; +; @returns ax 1 if enabled, 0 if disabled. +; +BEGINPROC IsA20GateEnabled_rm + push ds + push es + push dx + pushf + cli + +.once_again: + xor ax, ax + mov ds, ax + dec ax + mov es, ax + + mov ax, [es:0010h] ; 0ffff:0010 => 0100000h (1 MB) + mov dx, [ds:0000h] ; 00000:0000 => 0000000h - save it + not ax + mov [ds:0000h], ax ; 0000000h - write ~[0100000h] + cmp [es:0010h], ax ; 0100000h - same as 0000000h if A20 is disabled. + mov [ds:0000h], dx ; 0000000h - restore original value + setne al + movzx ax, al + + popf + pop dx + pop es + pop ds + ret +ENDPROC IsA20GateEnabled_rm + +;; +; Checks if the BIOS thinks the A20 gate is enabled. +; +; @returns ax 1 if enabled, 0 if disabled. +; +BEGINPROC BiosIsA20GateEnabled_rm + push ecx + push eax + + mov ax, 2402h + int 15h + jnc .ok + mov al, 080h +.ok: + mov cx, ax + pop eax + mov ax, cx + pop ecx + ret +ENDPROC BiosIsA20GateEnabled_rm + +; +; Instantiate the template code. +; +%include "bootsector2-template-footer.mac" ; reset the initial environemnt. + +%define TMPL_RM +%include "bootsector2-cpu-a20-1-template.mac" +;%define TMPL_CMN_V86 +;%include "bootsector2-cpu-a20-1-template.mac" +%define TMPL_PE16 +%include "bootsector2-cpu-a20-1-template.mac" +%define TMPL_PE32 +%include "bootsector2-cpu-a20-1-template.mac" +;%define TMPL_PP16 +;%include "bootsector2-cpu-a20-1-template.mac" +%define TMPL_PP32 +%include "bootsector2-cpu-a20-1-template.mac" +;%define TMPL_PAE16 +;%include "bootsector2-cpu-a20-1-template.mac" +%define TMPL_PAE32 +%include "bootsector2-cpu-a20-1-template.mac" +;%define TMPL_LM16 +;%include "bootsector2-cpu-a20-1-template.mac" +;%define TMPL_LM32 +;%include "bootsector2-cpu-a20-1-template.mac" +%define TMPL_LM64 +%include "bootsector2-cpu-a20-1-template.mac" + + +; +; End sections and image. +; +%include "bootsector2-common-end.mac" + |