Re: [Qemu-devel] [PATCH] multiboot: Fix module loading and setting of mmap

[Adam Lackorzynski <adam@os.inf.tu-dresden.de>]

On Wed Nov 18, 2009 at 15:33:10 +0100, Alexander Graf wrote:
> Adam Lackorzynski wrote:
> > I need to following to fix multiboot booting for me.
> >
> > Should linuxboot.bin and multiboot.bin end up in pc-bios instead of
> > pc-bios/optionrom?
> 
> >              load_image(initrd_filename,
> >                         mb_kernel_data + mb_mod_start - mh_load_addr);
> >  
> > @@ -720,7 +720,7 @@ static int load_multiboot(void *fw_cfg,
> >      fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data,
> >                       sizeof(bootinfo));
> >  
> > -    option_rom[nb_option_roms] = "multiboot.bin";
> > +    option_rom[nb_option_roms] = "optionrom/multiboot.bin";
> >   
> 
> This is wrong. The .bin file should be in pc-bios. It just doesn't get
> copied over as part of the build process, but instead relies on the
> committer to make sure the binary is updated on every source change.

Ok, didn't know. Thank you both for clarifying! New patch attached.


Signed-off-by: Adam Lackorzynski <adam@os.inf.tu-dresden.de>
---
 hw/pc.c                       |    2 +-
 pc-bios/multiboot.bin         |  Bin 512 -> 1024 bytes
 pc-bios/optionrom/multiboot.S |    5 ++++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/hw/pc.c b/hw/pc.c
index 7c791c4..6bcfe1b 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -661,7 +661,7 @@ static int load_multiboot(void *fw_cfg,
 
             /* append module data at the end of last module */
             mb_kernel_data = qemu_realloc(mb_kernel_data,
-                                          mh_load_addr - mb_mod_end);
+                                          mb_mod_end - mh_load_addr);
             load_image(initrd_filename,
                        mb_kernel_data + mb_mod_start - mh_load_addr);
 
diff --git a/pc-bios/multiboot.bin b/pc-bios/multiboot.bin
index 59737c3c6798f83c1b35534d7865c79ba9ca3bc8..d7da6e04ad6d71d26f577d9d6a019719bcce8766 100644
GIT binary patch
delta 261
zcmXZVu}Z^G6vpv$F1I0cu#I9V4%gzY#MMa$cNeJ-(0mTo!A)Em=wfIHT=E32KEb6f
z2@WZAa%&f<xELrj&`k=OK!*b#{NR6l>Dz<rSAi>annbhA>QS4*9nc|err{)-{caFW
zkS-*`52Rlb!8dr0Vcx-T=_1W#lw+iR82s)bP(*Jwd4ZBNQf*NVi%LEaTeb=1pTyK@
z+^ns}PHl-)KRP1F^qtxdQnO1ag{ZR4?YeL3`o3c=dU$b3KcBZeG`LkZ4HHr0DDm)j
sLZm;BWd>vGLhU(Kng}aYiFF^Qsf$Z-!SNZpqTu*}quA%c_PYG^4_6gol>h($

delta 120
zcmZqRXkd{DUB#FdAZK`>??&3f6b8Mt#U_l$*-{u3C-RF+cFSckrZFB)>jcr=au!gI
z1>?lS%1k@BCmvOp_`zCCFO8p3EQ2v^2O|Rm1HaM%y|n*&7L1b}8FeS`W7J{=3f^Ow
R{EE?l$$@dQBGY6>MgYdxBLx5e

diff --git a/pc-bios/optionrom/multiboot.S b/pc-bios/optionrom/multiboot.S
index be5c9fc..9131837 100644
--- a/pc-bios/optionrom/multiboot.S
+++ b/pc-bios/optionrom/multiboot.S
@@ -62,6 +62,9 @@ run_multiboot:
 	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)
 
@@ -71,7 +74,7 @@ run_multiboot:
 	mov		%ax, %fs
 
 	/* ES = mmap_addr */
-	mov		%eax, %fs:0x48
+	mov 		%fs:48, %eax
 	shr		$4, %eax
 	mov		%ax, %es
 
-- 
1.6.5.2



Adam
-- 
Adam                 adam@os.inf.tu-dresden.de
  Lackorzynski         http://os.inf.tu-dresden.de/~adam/