19 Oct
2024
19 Oct
'24
2:54 p.m.
https://git.reactos.org/?p=reactos.git;a=commitdiff;h=b524c18a3ea5a308dd1cb…
commit b524c18a3ea5a308dd1cbd11b66040d20065548e
Author: Daniel Victor <ilauncherdeveloper(a)gmail.com>
AuthorDate: Mon Oct 7 15:33:37 2024 -0300
Commit: Timo Kreuzer <timo.kreuzer(a)reactos.org>
CommitDate: Sat Oct 19 17:54:39 2024 +0300
[FREELDR/x64] Add Multiboot header
---
boot/freeldr/freeldr/arch/amd64/entry.S | 5 +-
boot/freeldr/freeldr/arch/i386/multiboot.S | 101 +++++++++++++++--------------
boot/freeldr/freeldr/pcat.cmake | 3 +
sdk/include/asm/asm.inc | 17 ++++-
4 files changed, 74 insertions(+), 52 deletions(-)
diff --git a/boot/freeldr/freeldr/arch/amd64/entry.S
b/boot/freeldr/freeldr/arch/amd64/entry.S
index f05d144ce55..7a6537f21c9 100644
--- a/boot/freeldr/freeldr/arch/amd64/entry.S
+++ b/boot/freeldr/freeldr/arch/amd64/entry.S
@@ -5,7 +5,7 @@
#include <arch/pc/pcbios.h>
EXTERN BootMain:PROC
-// EXTERN cmdline:DWORD
+EXTERN cmdline:DWORD
EXTERN DiskStopFloppyMotor:PROC
@@ -71,8 +71,7 @@ FrldrStartup:
rep stosq
/* Pass the command line to BootMain */
- // mov rcx, offset cmdline
- xor rcx, rcx
+ mov rcx, offset cmdline
/* GO! */
call BootMain
diff --git a/boot/freeldr/freeldr/arch/i386/multiboot.S
b/boot/freeldr/freeldr/arch/i386/multiboot.S
index e176a64d54c..556bc630838 100644
--- a/boot/freeldr/freeldr/arch/i386/multiboot.S
+++ b/boot/freeldr/freeldr/arch/i386/multiboot.S
@@ -1,27 +1,16 @@
/*
- * FreeLoader
- * Copyright (C) 1998-2002 Brian Palmer <brianp(a)sginet.com>
- *
- * 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; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * PROJECT: FreeLoader
+ * LICENSE: GPL-2.0-or-later (https://spdx.org/licenses/GPL-2.0-or-later)
+ * PURPOSE: Support for the Multiboot v1 specification.
+ * COPYRIGHT: Copyright 1998-2002 Brian Palmer <brianp(a)sginet.com>
+ * Copyright 2024 Daniel Victor <ilauncherdeveloper(a)gmail.com>
*/
#include <asm.inc>
#include <arch/pc/x86common.h>
#include <multiboot.h>
-/* Multiboot support
+/* Multiboot v1 support
*
* Allows freeldr to be loaded as a "multiboot kernel" by
* other boot loaders like GRUB.
@@ -47,6 +36,16 @@
#define INITIAL_BASE HEX(200000)
+#ifdef _M_IX86
+#define rax eax
+#define rbx ebx
+#define rcx ecx
+#define rdi edi
+#define rdx edx
+#define rsi esi
+#endif
+
+
#ifdef _USE_ML
EXTERN __bss_start__:DWORD
EXTERN __bss_end__:DWORD
@@ -54,8 +53,7 @@ EXTERN __bss_end__:DWORD
#ifdef _USE_ML
-.MBDATA SEGMENT PUBLIC 'DATA'
-//ASSUME nothing
+.MBDATA SEGMENT 'DATA'
#endif
/* Align to 32 bits boundary */
@@ -85,8 +83,12 @@ MultibootHeader:
#endif
+#ifdef _M_IX86
.code32
ASSUME ES:NOTHING, FS:NOTHING, GS:NOTHING
+#else
+.code64
+#endif
MultibootEntry:
cld
@@ -98,36 +100,35 @@ MultibootEntry:
/* Save multiboot info structure */
mov esi, ebx
mov edi, offset MultibootInfo + INITIAL_BASE - FREELDR_BASE
- mov ecx, (MB_INFO_SIZE / 4)
- rep movsd
- mov dword ptr ds:[MultibootInfo + INITIAL_BASE - FREELDR_BASE +
MB_INFO_MMAP_ADDR_OFFSET], 0
- mov dword ptr ds:[_MultibootInfoPtr + INITIAL_BASE - FREELDR_BASE], offset
MultibootInfo
+ mov ecx, MB_INFO_SIZE
+ rep movsb
+ mov dword ptr [MultibootInfo + INITIAL_BASE - FREELDR_BASE +
MB_INFO_MMAP_ADDR_OFFSET], 0
+ mov dword ptr [_MultibootInfoPtr + INITIAL_BASE - FREELDR_BASE], offset
MultibootInfo
/* See if the memory map was passed in */
- test dword ptr ds:[ebx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_MEMORY_MAP
+ test dword ptr [rbx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_MEMORY_MAP
jz mbchk_command_line
/* Check memory map length */
- mov ecx, dword ptr ds:[ebx + MB_INFO_MMAP_LEN_OFFSET]
+ mov rcx, [rbx + MB_INFO_MMAP_LEN_OFFSET]
test ecx, ecx
jz mbchk_command_line
cmp ecx, MB_MMAP_SIZE
jg mbchk_command_line
/* Check memory map address */
- mov esi, dword ptr ds:[ebx + MB_INFO_MMAP_ADDR_OFFSET]
+ mov rsi, [rbx + MB_INFO_MMAP_ADDR_OFFSET]
test esi, esi
jz mbchk_command_line
/* Save memory map structure */
mov edi, offset MultibootMemoryMap + INITIAL_BASE - FREELDR_BASE
- shr ecx, 2
- rep movsd
+ rep movsb
/* Relocate memory map address */
- mov dword ptr ds:[MultibootInfo + INITIAL_BASE - FREELDR_BASE +
MB_INFO_MMAP_ADDR_OFFSET], offset MultibootMemoryMap
+ mov dword ptr [MultibootInfo + INITIAL_BASE - FREELDR_BASE +
MB_INFO_MMAP_ADDR_OFFSET], offset MultibootMemoryMap
mbchk_command_line:
/* Save command line */
- test dword ptr ds:[ebx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_COMMAND_LINE
+ test dword ptr [rbx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_COMMAND_LINE
jz mb2
- mov esi, dword ptr ds:[ebx + MB_INFO_COMMAND_LINE_OFFSET]
+ mov rsi, [rbx + MB_INFO_COMMAND_LINE_OFFSET]
mov edi, offset cmdline + INITIAL_BASE - FREELDR_BASE
mov ecx, CMDLINE_SIZE - 1
mb1:
@@ -140,15 +141,18 @@ mb1:
mb2:
/* See if the boot device was passed in */
- test dword ptr ds:[ebx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_BOOT_DEVICE
+ test dword ptr [rbx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_BOOT_DEVICE
/* If no boot device known, assume first partition of first harddisk */
mov dx, HEX(0180)
jz mb3
/* Load boot drive into DL, boot partition into DH */
- mov edx, dword ptr ds:[ebx + MB_INFO_BOOT_DEVICE_OFFSET]
+ mov rdx, [rbx + MB_INFO_BOOT_DEVICE_OFFSET]
bswap edx
+
+ cmp dh, HEX(FF)
+ jz mb3
inc dh
mb3:
@@ -156,15 +160,14 @@ mb3:
mov esi, INITIAL_BASE
mov edi, FREELDR_BASE
mov ecx, offset __bss_start__ - FREELDR_BASE
- shr ecx, 2
- rep movsd
+ rep movsb
/* Load segment registers for real-address mode */
-#ifdef _USE_ML
- lgdt fword ptr ds:[gdtptr]
-#else
- lgdt ds:[gdtptr]
-#endif
+ mov edi, offset gdtptr
+ lgdt lXdtPrefix [rdi]
+ mov edi, offset idtptr
+ lidt lXdtPrefix [rdi]
+
mov ax, HEX(10)
mov ds, ax
mov es, ax
@@ -180,16 +183,14 @@ mbfail:
mbstop:
jmp short mbstop /* We should never get here */
-.code16
mb4:
/* Disable protected mode */
- mov eax, cr0
- and eax, CR0_PE_CLR
- mov cr0, eax
+ mov rax, cr0
+ data32 and eax, CR0_PE_CLR
+ mov cr0, rax
/* Jump to real entry point */
ljmp16 0, FREELDR_BASE
-.endcode16
/* Force 8-byte alignment */
@@ -201,8 +202,14 @@ gdt:
/* GDT table pointer */
gdtptr:
- .word HEX(17) /* Limit */
- .long gdt /* Base Address */
+ .word HEX(17) /* Limit */
+ .long gdt /* Base Address */
+
+ /* Force 8-byte alignment */
+ .align 8
+idtptr:
+ .word HEX(3FF) /* Limit */
+ .long HEX(0) /* Base Address */
PUBLIC _MultibootInfoPtr
_MultibootInfoPtr:
diff --git a/boot/freeldr/freeldr/pcat.cmake b/boot/freeldr/freeldr/pcat.cmake
index ac18b0e00ec..020ae7e018a 100644
--- a/boot/freeldr/freeldr/pcat.cmake
+++ b/boot/freeldr/freeldr/pcat.cmake
@@ -110,6 +110,9 @@ if(ARCH STREQUAL "i386")
endif()
elseif(ARCH STREQUAL "amd64")
+ list(APPEND PCATLDR_BASE_ASM_SOURCE
+ arch/i386/multiboot.S)
+
list(APPEND PCATLDR_COMMON_ASM_SOURCE
arch/amd64/entry.S
arch/amd64/int386.S
diff --git a/sdk/include/asm/asm.inc b/sdk/include/asm/asm.inc
index 7b3df60e6b1..b1a29b8802e 100644
--- a/sdk/include/asm/asm.inc
+++ b/sdk/include/asm/asm.inc
@@ -172,6 +172,8 @@ ENDM
.skip size, fill
ENDM
+#define lXdtPrefix fword ptr
+
ljmp MACRO segment, offset
DB 0EAh
DD offset
@@ -320,12 +322,23 @@ ENDM
#define REPEAT .rept
#define ENDR .endr
+#define lXdtPrefix
+
.macro ljmp segment, offset
- jmp far ptr \segment:\offset
+ .byte 0xEA
+ .long offset
+ .word segment
.endm
.macro ljmp16 segment, offset
- jmp far ptr \segment:\offset
+ .byte 0xEA
+ .word offset
+ .word segment
+.endm
+
+.macro data32 opcode:vararg
+ .byte 0x66
+ opcode
.endm
.macro retf
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Daniel Victor