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Re: [Qemu-devel] [PATCH] fix linuxboot.bin and multiboot.bin to not hija
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From: |
Gleb Natapov |
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Subject: |
Re: [Qemu-devel] [PATCH] fix linuxboot.bin and multiboot.bin to not hijack int19 |
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Date: |
Wed, 2 Feb 2011 07:06:51 +0200 |
On Tue, Feb 01, 2011 at 05:02:55PM -0600, Anthony Liguori wrote:
> On 01/31/2011 03:02 AM, Gleb Natapov wrote:
> >Currently linuxboot.bin and multiboot.bin option roms override int19
> >vector to intercept boot process. No sane option rom should do that.
> >Provide bev entry instead that will be called by BIOS if option rom
> >is selected for booting.
> >
> >Signed-off-by: Gleb Natapov<address@hidden>
> >---
> >
> >Note that this patch should be applied after qemu will upgrade to Seabios
> >that supports boot order. Otherwise there will be change in behavior
> >since option rom will not be selected for booting by default.
>
> I don't think there's a SeaBIOS release yet that includes the boot
> order support.
>
I thought for AHCI support you are going to move to latest Seabios HEAD.
If this is not the case the patch should wait.
> Regards,
>
> Anthony Liguori
>
> >diff --git a/pc-bios/optionrom/linuxboot.S b/pc-bios/optionrom/linuxboot.S
> >index c109363..79b3ae8 100644
> >--- a/pc-bios/optionrom/linuxboot.S
> >+++ b/pc-bios/optionrom/linuxboot.S
> >@@ -22,6 +22,8 @@
> >
> > #include "optionrom.h"
> >
> >+#define PRODUCT "Linux loader"
> >+
> > BOOT_ROM_START
> >
> > run_linuxboot:
> >diff --git a/pc-bios/optionrom/multiboot.S b/pc-bios/optionrom/multiboot.S
> >index 9131837..069c4e8 100644
> >--- a/pc-bios/optionrom/multiboot.S
> >+++ b/pc-bios/optionrom/multiboot.S
> >@@ -20,6 +20,8 @@
> >
> > #include "optionrom.h"
> >
> >+#define PRODUCT "multiboot loader"
> >+
> > #define MULTIBOOT_MAGIC 0x2badb002
> >
> > #define GS_PROT_JUMP 0
> >diff --git a/pc-bios/optionrom/optionrom.h b/pc-bios/optionrom/optionrom.h
> >index fbdd48a..95dbdda 100644
> >--- a/pc-bios/optionrom/optionrom.h
> >+++ b/pc-bios/optionrom/optionrom.h
> >@@ -93,31 +93,41 @@
> > .global _start; \
> > _start:; \
> > .short 0xaa55; \
> >- .byte (_end - _start) / 512;
> >+ .byte (_end - _start) / 512; \
> >+ lret; \
> >+ .org 0x18; \
> >+ .short 0; \
> >+ .short _pnph; \
> >+ _pnph: \
> >+ .ascii "$PnP"; \
> >+ .byte 0x01; \
> >+ .byte ( _pnph_len / 16 ); \
> >+ .short 0x0000; \
> >+ .byte 0x00; \
> >+ .byte 0x00; \
> >+ .long 0x00000000; \
> >+ .short _manufacturer; \
> >+ .short _product; \
> >+ .long 0x00000000; \
> >+ .short 0x0000; \
> >+ .short 0x0000; \
> >+ .short _bev; \
> >+ .short 0x0000; \
> >+ .short 0x0000; \
> >+ .equ _pnph_len, . - _pnph;
> >
> > #define BOOT_ROM_START \
> > OPTION_ROM_START \
> >- push %eax; \
> >- push %ds; \
> >- \
> >- /* setup ds so we can access the IVT */ \
> >- xor %ax, %ax; \
> >- mov %ax, %ds; \
> >- \
> >- /* install our int 19 handler */ \
> >- movw $int19_handler, (0x19*4); \
> >- mov %cs, (0x19*4+2); \
> >- \
> >- pop %ds; \
> >- pop %eax; \
> >- lret; \
> >- \
> >- int19_handler:; \
> >+ _bev:; \
> > /* DS = CS */ \
> > movw %cs, %ax; \
> > movw %ax, %ds;
> >
> > #define OPTION_ROM_END \
> >+ _manufacturer:; \
> >+ .asciz "QEMU"; \
> >+ _product:; \
> >+ .asciz PRODUCT; \
> > .align 512, 0; \
> > _end:
> >
> >--
> > Gleb.
> >
--
Gleb.