disk/scsiport.c)
if(NOT MSVC)
list(APPEND FREELDR_COMMON_SOURCE
- arch/i386/drvmap.S
- arch/i386/multiboot.S)
+ arch/i386/drvmap.S)
endif()
elseif(ARCH MATCHES amd64)
list(APPEND FREELDR_COMMON_SOURCE
add_library(freeldr_common ${FREELDR_COMMON_SOURCE})
add_dependencies(freeldr_common bugcodes)
+if(ARCH MATCHES i386 AND NOT MSVC)
+ list(APPEND FREELDR_BASE_SOURCE arch/i386/multiboot.S)
+endif()
list(APPEND FREELDR_BASE_SOURCE
bootmgr.c # This file is compiled with custom definitions
add_executable(freeldr_pe ${FREELDR_BASE_SOURCE})
if(NOT MSVC)
- set_target_properties(freeldr_pe PROPERTIES LINK_FLAGS "-Wl,--strip-all -Wl,--exclude-all-symbols -Wl,--file-alignment,0x1000 -Wl,-T,${CMAKE_CURRENT_SOURCE_DIR}/freeldr_i386.lnk")
+ set_target_properties(freeldr_pe PROPERTIES LINK_FLAGS "-Wl,--strip-all,--exclude-all-symbols,--file-alignment,0x1000,-T,${CMAKE_CURRENT_SOURCE_DIR}/freeldr_i386.lnk")
else()
set_target_properties(freeldr_pe PROPERTIES LINK_FLAGS "/ignore:4078 /ignore:4254 /DRIVER /FIXED /ALIGN:0x400 /SECTION:.text,ERW /SECTION:.data,RW /MERGE:.text16=.text /MERGE:.data=.text /MERGE:.rdata=.text /MERGE:.bss=.text /SUBSYSTEM:BOOT_APPLICATION")
endif()
add_executable(setupldr_pe ${FREELDR_BASE_SOURCE} ${SETUPLDR_SOURCE})
if(NOT MSVC)
- set_target_properties(setupldr_pe PROPERTIES LINK_FLAGS "-Wl,--strip-all -Wl,--exclude-all-symbols -Wl,--file-alignment,0x1000 -Wl,-T,${CMAKE_CURRENT_SOURCE_DIR}/freeldr_i386.lnk" COMPILE_DEFINITIONS "FREELDR_REACTOS_SETUP")
+ set_target_properties(setupldr_pe PROPERTIES LINK_FLAGS "-Wl,--strip-all,--exclude-all-symbols,--file-alignment,0x1000,-T,${CMAKE_CURRENT_SOURCE_DIR}/freeldr_i386.lnk" COMPILE_DEFINITIONS "FREELDR_REACTOS_SETUP")
else()
set_target_properties(setupldr_pe PROPERTIES LINK_FLAGS "/ignore:4078 /ignore:4254 /DRIVER /FIXED /ALIGN:0x400 /SECTION:.text,ERW /SECTION:.data,RW /MERGE:.text16=.text /MERGE:.data=.text /MERGE:.rdata=.text /MERGE:.bss=.text /SUBSYSTEM:BOOT_APPLICATION" COMPILE_DEFINITIONS "FREELDR_REACTOS_SETUP")
endif()
#include <arch/pc/x86common.h>
#include <multiboot.h>
-
/* Multiboot support
*
* Allows freeldr to be loaded as a "multiboot kernel" by
- * other boot loaders like Grub
+ * other boot loaders like GRUB.
* This code is not referenced from anywhere. GRUB searches for
* the header signature and uses the header to load it.
*/
-#define MB_INFO_SIZE 90
#define MB_INFO_FLAGS_OFFSET 0
#define MB_INFO_BOOT_DEVICE_OFFSET 12
#define MB_INFO_COMMAND_LINE_OFFSET 16
#define CMDLINE_SIZE 256
/*
- * We want to execute at 0x8000 (to be compatible with bootsector
- * loading), but Grub only allows loading of multiboot kernels
- * above 1MB. So we let Grub load us there and then relocate
- * ourself to 0x8000
+ * We want to execute at FREELDR_BASE (to be compatible with
+ * bootsector loading), but GRUB only allows loading of
+ * multiboot kernels above 1MB. So we let GRUB load us
+ * there and then relocate ourself to FREELDR_BASE.
*/
#define INITIAL_BASE HEX(200000)
- /* Align 32 bits boundary */
-.align 4
+ /* Align to 32 bits boundary */
+ .align 4
- /* Multiboot header */
+ /* Multiboot header */
MultibootHeader:
- /* magic */
- .long MULTIBOOT_HEADER_MAGIC
- /* flags */
- .long MULTIBOOT_HEADER_FLAGS
- /* checksum */
- .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
- /* header_addr */
- .long INITIAL_BASE + MultibootHeader - FREELDR_BASE
- /* load_addr */
- .long INITIAL_BASE
- /* load_end_addr */
- .long INITIAL_BASE + __bss_start__ - FREELDR_BASE
- /* bss_end_addr */
- .long INITIAL_BASE + __bss_end__ - FREELDR_BASE
- /* entry_addr */
- .long INITIAL_BASE + MultibootEntry - FREELDR_BASE
+ /* magic */
+ .long MULTIBOOT_HEADER_MAGIC
+ /* flags */
+ .long MULTIBOOT_HEADER_FLAGS
+ /* checksum */
+ .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS)
+ /* header_addr */
+ .long INITIAL_BASE + MultibootHeader - FREELDR_BASE
+ /* load_addr */
+ .long INITIAL_BASE
+ /* load_end_addr */
+ .long INITIAL_BASE + __bss_start__ - FREELDR_BASE
+ /* bss_end_addr */
+ .long 0
+ /* entry_addr */
+ .long INITIAL_BASE + MultibootEntry - FREELDR_BASE
MultibootEntry:
- cli /* Even after setting up the our IDT below we are
- * not ready to handle hardware interrupts (no entries
- * in IDT), so there's no sti here. Interrupts will be
- * enabled in due time */
-
- /* Although the multiboot spec says we should be called with the
- * segment registers set to 4GB flat mode, let's be sure and set up
- * our own */
- lgdt gdtptrhigh + INITIAL_BASE - FREELDR_BASE
- /* Reload segment selectors */
- //ljmp $PMODE_CS, $(mb1 + INITIAL_BASE - FREELDR_BASE)
- jmp far ptr PMODE_CS: (mb1 + INITIAL_BASE - FREELDR_BASE)
+ cld
+
+ /* Save command line */
+ test dword ptr [ebx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_COMMAND_LINE
+ jz mb2
+ mov esi, [ebx + MB_INFO_COMMAND_LINE_OFFSET]
+ mov edi, offset cmdline + INITIAL_BASE - FREELDR_BASE
+ mov ecx, CMDLINE_SIZE - 1
mb1:
- mov dx, PMODE_DS
- mov ds, dx
- mov es, dx
-
- /* Check for valid multiboot signature */
- cmp eax, MULTIBOOT_BOOTLOADER_MAGIC
- jne mbfail
-
- /* Store multiboot info in a safe place */
- mov esi, ebx
- mov edi, offset mb_info + INITIAL_BASE - FREELDR_BASE
- mov ecx, MB_INFO_SIZE
- rep movsb
-
- /* Save commandline */
- mov edx, [ebx + MB_INFO_FLAGS_OFFSET]
- test dword ptr [ebx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_COMMAND_LINE
- jz mb3
- mov esi, [ebx + MB_INFO_COMMAND_LINE_OFFSET]
- mov edi, offset cmdline + INITIAL_BASE - FREELDR_BASE
- mov ecx, CMDLINE_SIZE
-mb2: lodsb
- stosb
- test al, al
- jz mb3
- dec ecx
- jnz mb2
-mb3:
+ lodsb
+ stosb
+ test al, al
+ jz mb2
+ dec ecx
+ jnz mb1
+
+mb2:
+ /* See if the boot device was passed in */
+ test dword ptr [ebx + 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, [ebx + MB_INFO_BOOT_DEVICE_OFFSET]
+ bswap edx
+ inc dh
- /* Copy to low mem */
- mov esi, INITIAL_BASE
- mov edi, FREELDR_BASE
- mov ecx, (offset __bss_end__ - FREELDR_BASE)
- add ecx, 3
- shr ecx, 2
- rep movsd
-
- /* Load the GDT and IDT */
- lgdt gdtptr
- lidt i386idtptr
-
- /* Clear prefetch queue & correct CS,
- * jump to low mem */
- //ljmp $PMODE_CS, $mb4
- jmp far ptr PMODE_CS:mb4
+mb3:
+ /* Relocate itself to lower address */
+ mov esi, INITIAL_BASE
+ mov edi, FREELDR_BASE
+ mov ecx, (offset __bss_start__ - FREELDR_BASE + 3)
+ shr ecx, 2
+ rep movsd
+
+ /* Clean out bss */
+ xor eax, eax
+ mov ecx, offset __bss_end__ + 3
+ sub ecx, offset __bss_start__
+ shr ecx, 2
+ rep stosd
+
+ /* Load segment registers for real-address mode */
+ lgdt gdtptr
+ mov ax, HEX(10)
+ mov ds, ax
+ mov es, ax
+ mov fs, ax
+ mov gs, ax
+ mov ss, ax
+
+ /* Jump to relocated code */
+ ljmp HEX(08), mb4
+
+.code16
mb4:
- /* Reload segment selectors */
- mov dx, PMODE_DS
- mov ds, dx
- mov es, dx
- mov fs, dx
- mov gs, dx
- mov ss, dx
- mov esp, STACK32ADDR
-
- mov ebx, offset mb_info
- /* See if the boot device was passed in */
- mov edx, [ebx + MB_INFO_FLAGS_OFFSET]
- test edx, MB_INFO_FLAG_BOOT_DEVICE
- jz mb5
- /* Retrieve boot device info */
- mov eax, [ebx + MB_INFO_BOOT_DEVICE_OFFSET]
- shr eax, 16
- inc al
- mov byte ptr [_FrldrBootPartition], al
- mov byte ptr [_FrldrBootDrive], ah
- jmp mb6
-mb5: /* No boot device known, assume first partition of first harddisk */
- mov byte ptr [_FrldrBootDrive], HEX(80)
- mov byte ptr [_FrldrBootPartition], 1
-mb6:
- /* Check for command line */
- mov eax, offset cmdline
- test dword ptr [ebx + MB_INFO_FLAGS_OFFSET], MB_INFO_FLAG_COMMAND_LINE
- jnz mb7
- xor eax, eax
-mb7:
-
- /* GO! */
- push eax
- call _BootMain
-
-mbfail:
- int 3
-mbstop: jmp mbstop /* We should never get here */
-
-mb_info:
- .fill MB_INFO_SIZE, 1, 0
+ /* Disable protected mode */
+ mov eax, cr0
+ and eax, CR0_PE_CLR
+ mov cr0, eax
-cmdline:
- .fill CMDLINE_SIZE, 1, 0
+ /* Jump to real entry point */
+ ljmp16 0, FREELDR_BASE
-.align 4 /* force 4-byte alignment */
+ /* Force 8-byte alignment */
+ .align 8
gdt:
- /* NULL Descriptor */
- .word HEX(0000)
- .word HEX(0000)
- .word HEX(0000)
- .word HEX(0000)
-
- /* 32-bit flat CS */
- .word HEX(FFFF)
- .word HEX(0000)
- .word HEX(9A00)
- .word HEX(00CF)
-
- /* 32-bit flat DS */
- .word HEX(FFFF)
- .word HEX(0000)
- .word HEX(9200)
- .word HEX(00CF)
-
- /* 16-bit real mode CS */
- .word HEX(FFFF)
- .word HEX(0000)
- .word HEX(9E00)
- .word HEX(0000)
-
- /* 16-bit real mode DS */
- .word HEX(FFFF)
- .word HEX(0000)
- .word HEX(9200)
- .word HEX(0000)
-
-/* GDT table pointer */
+ /* 16-bit flat CS (!) */
+ .word HEX(FFFF)
+ .word HEX(0000)
+ .word HEX(9B00)
+ .word HEX(008F)
+
+ /* 16-bit real mode DS */
+ .word HEX(FFFF)
+ .word HEX(0000)
+ .word HEX(9300)
+ .word HEX(0000)
+
+ /* GDT pointer */
gdtptr:
- .word HEX(27) /* Limit */
- .long gdt /* Base Address */
+ .word HEX(17) /* Limit */
+ .long gdt - 8 /* Base Address */
+
+PUBLIC cmdline
+cmdline:
+ .space CMDLINE_SIZE
-/* Initial GDT table pointer for multiboot */
-gdtptrhigh:
- .word HEX(27) /* Limit */
- .long gdt + INITIAL_BASE - FREELDR_BASE /* Base Address */
+END
projects / reactos.git / commitdiff