qemu-e2k/pc-bios/optionrom/multiboot.S

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/*
* Multiboot Option ROM
*
* 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, see <http://www.gnu.org/licenses/>.
*
* Copyright Novell Inc, 2009
* Authors: Alexander Graf <agraf@suse.de>
*/
#include "optionrom.h"
#define BOOT_ROM_PRODUCT "multiboot loader"
#define MULTIBOOT_MAGIC 0x2badb002
#define GS_PROT_JUMP 0
#define GS_GDT_DESC 6
BOOT_ROM_START
run_multiboot:
cli
cld
mov %cs, %eax
shl $0x4, %eax
/* set up a long jump descriptor that is PC relative */
/* move stack memory to %gs */
mov %ss, %ecx
shl $0x4, %ecx
mov %esp, %ebx
add %ebx, %ecx
sub $0x20, %ecx
sub $0x30, %esp
shr $0x4, %ecx
mov %cx, %gs
/* now push the indirect jump descriptor there */
mov (prot_jump), %ebx
add %eax, %ebx
movl %ebx, %gs:GS_PROT_JUMP
mov $8, %bx
movw %bx, %gs:GS_PROT_JUMP + 4
/* fix the gdt descriptor to be PC relative */
movw (gdt_desc), %bx
movw %bx, %gs:GS_GDT_DESC
movl (gdt_desc+2), %ebx
add %eax, %ebx
movl %ebx, %gs:GS_GDT_DESC + 2
xor %eax, %eax
mov %eax, %es
/* Read the bootinfo struct into RAM */
read_fw_blob(FW_CFG_INITRD)
/* FS = bootinfo_struct */
read_fw FW_CFG_INITRD_ADDR
shr $4, %eax
mov %ax, %fs
/* Account for the EBDA in the multiboot structure's e801
* map.
*/
int $0x12
cwtl
movl %eax, %fs:4
/* ES = mmap_addr */
mov %fs:48, %eax
shr $4, %eax
mov %ax, %es
/* Initialize multiboot mmap structs using int 0x15(e820) */
xor %ebx, %ebx
/* mmap start after first size */
movl $4, %edi
mmap_loop:
/* entry size (mmap struct) & max buffer size (int15) */
movl $20, %ecx
/* store entry size */
multiboot.S patch for old as(1) (was: Re: [Qemu-devel] Some OpenBSD/amd64 build fixes) On Wed, Sep 23, 2009 at 10:55:02PM +0200, Juergen Lock wrote: > On Wed, Sep 23, 2009 at 09:31:16PM +0100, Laurence Tratt wrote: >[...] > > then the above error doesn't occur, but > > pc-bios/optionrom/multiboot.S dies as follows: > > > > $ > > AS optionrom/multiboot.o > > multiboot.S: Assembler messages: > > multiboot.S:116: Error: `%es:-4(%edi)' is not a valid 16 bit base/index > > expression > > $ > > > > What little Intel assembler I ever knew has long since departed from my > > brain, so I don't know why that error occurs, nor what a fix might be. > > > It occurs because of too old binutils (as(1) in this case), on FreeBSD > we now have a port for newer ones, > http://www.freshports.org/devel/binutils > so I depend on that and have the optionrom Makefile use the new as > like this: (the first change wrt CFLAGS is unrelated and has probably > been fixed in the meantime; it caused gmake to complain about > recursive use of CFLAGS.) > > Index: qemu/pc-bios/optionrom/Makefile > @@ -9,10 +9,13 @@ > > CFLAGS = -Wall -Wstrict-prototypes -Werror -fomit-frame-pointer -fno-builtin > CFLAGS += -I$(SRC_PATH) > -CFLAGS += $(call cc-option, $(CFLAGS), -fno-stack-protector,"") > +CFLAGS := $(CFLAGS) $(call cc-option, $(CFLAGS), -fno-stack-protector,"") > > build-all: multiboot.bin > > +%.o: %.S > + $(CC) -E $(CFLAGS) -o - -c $< |${LOCALBASE}/bin/as -V -Qy -o $@ > + > %.img: %.o > $(call quiet-command,$(LD) -Ttext 0 -e _start -s -o $@ $<," Building $(TARGET_DIR)$@") > That patch didn't seem to help on OpenBSD so I now finally got around making another one that just emits the bytes of the offending insn instead so people can keep using old assemblers: Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-10-13 23:29:12 +02:00
/* old as(1) doesn't like this insn so emit the bytes instead:
movl %ecx, %es:-4(%edi)
multiboot.S patch for old as(1) (was: Re: [Qemu-devel] Some OpenBSD/amd64 build fixes) On Wed, Sep 23, 2009 at 10:55:02PM +0200, Juergen Lock wrote: > On Wed, Sep 23, 2009 at 09:31:16PM +0100, Laurence Tratt wrote: >[...] > > then the above error doesn't occur, but > > pc-bios/optionrom/multiboot.S dies as follows: > > > > $ > > AS optionrom/multiboot.o > > multiboot.S: Assembler messages: > > multiboot.S:116: Error: `%es:-4(%edi)' is not a valid 16 bit base/index > > expression > > $ > > > > What little Intel assembler I ever knew has long since departed from my > > brain, so I don't know why that error occurs, nor what a fix might be. > > > It occurs because of too old binutils (as(1) in this case), on FreeBSD > we now have a port for newer ones, > http://www.freshports.org/devel/binutils > so I depend on that and have the optionrom Makefile use the new as > like this: (the first change wrt CFLAGS is unrelated and has probably > been fixed in the meantime; it caused gmake to complain about > recursive use of CFLAGS.) > > Index: qemu/pc-bios/optionrom/Makefile > @@ -9,10 +9,13 @@ > > CFLAGS = -Wall -Wstrict-prototypes -Werror -fomit-frame-pointer -fno-builtin > CFLAGS += -I$(SRC_PATH) > -CFLAGS += $(call cc-option, $(CFLAGS), -fno-stack-protector,"") > +CFLAGS := $(CFLAGS) $(call cc-option, $(CFLAGS), -fno-stack-protector,"") > > build-all: multiboot.bin > > +%.o: %.S > + $(CC) -E $(CFLAGS) -o - -c $< |${LOCALBASE}/bin/as -V -Qy -o $@ > + > %.img: %.o > $(call quiet-command,$(LD) -Ttext 0 -e _start -s -o $@ $<," Building $(TARGET_DIR)$@") > That patch didn't seem to help on OpenBSD so I now finally got around making another one that just emits the bytes of the offending insn instead so people can keep using old assemblers: Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2009-10-13 23:29:12 +02:00
*/
.dc.b 0x26,0x67,0x66,0x89,0x4f,0xfc
/* e820 */
movl $0x0000e820, %eax
/* 'SMAP' magic */
movl $0x534d4150, %edx
int $0x15
mmap_check_entry:
/* last entry? then we're done */
jb mmap_done
and %bx, %bx
jz mmap_done
/* valid entry, so let's loop on */
mmap_store_entry:
/* %ax = entry_number * 24 */
mov $24, %ax
mul %bx
mov %ax, %di
movw %di, %fs:0x2c
/* %di = 4 + (entry_number * 24) */
add $4, %di
jmp mmap_loop
mmap_done:
real_to_prot:
/* Load the GDT before going into protected mode */
lgdt:
data32 lgdt %gs:GS_GDT_DESC
/* get us to protected mode now */
movl $1, %eax
movl %eax, %cr0
/* the LJMP sets CS for us and gets us to 32-bit */
ljmp:
data32 ljmp *%gs:GS_PROT_JUMP
prot_mode:
.code32
/* initialize all other segments */
movl $0x10, %eax
movl %eax, %ss
movl %eax, %ds
movl %eax, %es
movl %eax, %fs
movl %eax, %gs
/* Read the kernel and modules into RAM */
read_fw_blob(FW_CFG_KERNEL)
/* Jump off to the kernel */
read_fw FW_CFG_KERNEL_ENTRY
mov %eax, %ecx
/* EBX contains a pointer to the bootinfo struct */
read_fw FW_CFG_INITRD_ADDR
movl %eax, %ebx
/* EAX has to contain the magic */
movl $MULTIBOOT_MAGIC, %eax
ljmp2:
jmp *%ecx
/* Variables */
.align 4, 0
prot_jump: .long prot_mode
.short 8
.align 4, 0
gdt:
/* 0x00 */
.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
/* 0x08: code segment (base=0, limit=0xfffff, type=32bit code exec/read, DPL=0, 4k) */
.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00
/* 0x10: data segment (base=0, limit=0xfffff, type=32bit data read/write, DPL=0, 4k) */
.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00
/* 0x18: code segment (base=0, limit=0x0ffff, type=16bit code exec/read/conf, DPL=0, 1b) */
.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x9e, 0x00, 0x00
/* 0x20: data segment (base=0, limit=0x0ffff, type=16bit data read/write, DPL=0, 1b) */
.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0x00, 0x00
gdt_desc:
.short (5 * 8) - 1
.long gdt
BOOT_ROM_END