2009-06-29 15:37:39 +02:00
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/*
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* Multiboot Option ROM
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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2009-07-16 22:47:01 +02:00
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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2009-06-29 15:37:39 +02:00
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*
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* Copyright Novell Inc, 2009
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* Authors: Alexander Graf <agraf@suse.de>
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*/
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2009-11-12 21:53:13 +01:00
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#include "optionrom.h"
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2009-06-29 15:37:39 +02:00
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#define MULTIBOOT_MAGIC 0x2badb002
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2009-11-12 21:53:12 +01:00
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#define GS_PROT_JUMP 0
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#define GS_GDT_DESC 6
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2009-06-29 15:37:39 +02:00
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2009-11-12 21:53:13 +01:00
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BOOT_ROM_START
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2009-06-29 15:37:39 +02:00
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run_multiboot:
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cli
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cld
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mov %cs, %eax
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shl $0x4, %eax
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2009-11-12 21:53:12 +01:00
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/* set up a long jump descriptor that is PC relative */
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2009-06-29 15:37:39 +02:00
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2009-11-12 21:53:12 +01:00
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/* move stack memory to %gs */
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mov %ss, %ecx
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shl $0x4, %ecx
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mov %esp, %ebx
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add %ebx, %ecx
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sub $0x20, %ecx
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sub $0x30, %esp
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shr $0x4, %ecx
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mov %cx, %gs
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/* now push the indirect jump decriptor there */
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2009-06-29 15:37:39 +02:00
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mov (prot_jump), %ebx
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add %eax, %ebx
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2009-11-12 21:53:12 +01:00
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movl %ebx, %gs:GS_PROT_JUMP
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mov $8, %bx
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movw %bx, %gs:GS_PROT_JUMP + 4
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/* fix the gdt descriptor to be PC relative */
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movw (gdt_desc), %bx
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movw %bx, %gs:GS_GDT_DESC
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movl (gdt_desc+2), %ebx
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add %eax, %ebx
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movl %ebx, %gs:GS_GDT_DESC + 2
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/* Read the bootinfo struct into RAM */
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read_fw_blob(FW_CFG_INITRD)
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2009-06-29 15:37:39 +02:00
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/* FS = bootinfo_struct */
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read_fw FW_CFG_INITRD_ADDR
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shr $4, %eax
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mov %ax, %fs
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/* ES = mmap_addr */
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2009-11-12 21:53:12 +01:00
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mov %eax, %fs:0x48
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2009-06-29 15:37:39 +02:00
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shr $4, %eax
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mov %ax, %es
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/* Initialize multiboot mmap structs using int 0x15(e820) */
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xor %ebx, %ebx
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/* mmap start after first size */
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movl $4, %edi
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mmap_loop:
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/* entry size (mmap struct) & max buffer size (int15) */
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movl $20, %ecx
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/* store entry size */
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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
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/* old as(1) doesn't like this insn so emit the bytes instead:
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2009-06-29 15:37:39 +02:00
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movl %ecx, %es:-4(%edi)
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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
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*/
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.dc.b 0x26,0x67,0x66,0x89,0x4f,0xfc
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2009-06-29 15:37:39 +02:00
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/* e820 */
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movl $0x0000e820, %eax
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/* 'SMAP' magic */
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movl $0x534d4150, %edx
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int $0x15
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mmap_check_entry:
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/* last entry? then we're done */
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jb mmap_done
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and %bx, %bx
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jz mmap_done
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/* valid entry, so let's loop on */
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mmap_store_entry:
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/* %ax = entry_number * 24 */
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mov $24, %ax
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mul %bx
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mov %ax, %di
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movw %di, %fs:0x2c
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/* %di = 4 + (entry_number * 24) */
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add $4, %di
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jmp mmap_loop
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mmap_done:
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real_to_prot:
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/* Load the GDT before going into protected mode */
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lgdt:
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2009-11-12 21:53:12 +01:00
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data32 lgdt %gs:GS_GDT_DESC
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2009-06-29 15:37:39 +02:00
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/* get us to protected mode now */
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movl $1, %eax
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movl %eax, %cr0
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/* the LJMP sets CS for us and gets us to 32-bit */
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ljmp:
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2009-11-12 21:53:12 +01:00
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data32 ljmp *%gs:GS_PROT_JUMP
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2009-06-29 15:37:39 +02:00
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prot_mode:
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.code32
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/* initialize all other segments */
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movl $0x10, %eax
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movl %eax, %ss
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movl %eax, %ds
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movl %eax, %es
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movl %eax, %fs
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movl %eax, %gs
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2009-11-12 21:53:12 +01:00
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/* Read the kernel and modules into RAM */
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read_fw_blob(FW_CFG_KERNEL)
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2009-06-29 15:37:39 +02:00
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/* Jump off to the kernel */
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2009-11-12 21:53:12 +01:00
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read_fw FW_CFG_KERNEL_ENTRY
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2009-06-29 15:37:39 +02:00
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mov %eax, %ecx
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/* EBX contains a pointer to the bootinfo struct */
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read_fw FW_CFG_INITRD_ADDR
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movl %eax, %ebx
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/* EAX has to contain the magic */
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movl $MULTIBOOT_MAGIC, %eax
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ljmp2:
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jmp *%ecx
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/* Variables */
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.align 4, 0
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prot_jump: .long prot_mode
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.short 8
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.align 4, 0
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gdt:
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/* 0x00 */
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.byte 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
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/* 0x08: code segment (base=0, limit=0xfffff, type=32bit code exec/read, DPL=0, 4k) */
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.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x9a, 0xcf, 0x00
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/* 0x10: data segment (base=0, limit=0xfffff, type=32bit data read/write, DPL=0, 4k) */
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.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0xcf, 0x00
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/* 0x18: code segment (base=0, limit=0x0ffff, type=16bit code exec/read/conf, DPL=0, 1b) */
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.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x9e, 0x00, 0x00
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/* 0x20: data segment (base=0, limit=0x0ffff, type=16bit data read/write, DPL=0, 1b) */
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.byte 0xff, 0xff, 0x00, 0x00, 0x00, 0x92, 0x00, 0x00
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gdt_desc:
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.short (5 * 8) - 1
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.long gdt
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2009-11-12 21:53:13 +01:00
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BOOT_ROM_END
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