lkml.org 
[lkml]   [2022]   [Nov]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 17/24] x86/boot: Reduce size of the DOS stub
Date
This is required to fit more sections in PE section tables,
since its size is restricted by zero page located at specific offset
after the PE header.

Tested-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Evgeniy Baskov <baskov@ispras.ru>
---
arch/x86/boot/header.S | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index f912d7770130..e4de831b2f64 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -59,17 +59,16 @@ start2:
cld

movw $bugger_off_msg, %si
+ movw $bugger_off_msg_size, %cx

msg_loop:
lodsb
- andb %al, %al
- jz bs_die
movb $0xe, %ah
movw $7, %bx
int $0x10
- jmp msg_loop
+ decw %cx
+ jnz msg_loop

-bs_die:
# Allow the user to press a key, then reboot
xorw %ax, %ax
int $0x16
@@ -89,10 +88,9 @@ bs_die:

.section ".bsdata", "a"
bugger_off_msg:
- .ascii "Use a boot loader.\r\n"
- .ascii "\n"
- .ascii "Remove disk and press any key to reboot...\r\n"
- .byte 0
+ .ascii "Use a boot loader. "
+ .ascii "Press a key to reboot"
+ .set bugger_off_msg_size, . - bugger_off_msg

#ifdef CONFIG_EFI_STUB
pe_header:
--
2.37.4
\
 
 \ /
  Last update: 2022-11-22 12:19    [W:0.127 / U:1.324 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site