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Subject[PATCH v4 17/26] 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>
Tested-by: Peter Jones <pjones@redhat.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 9338c68e7413..9fec80bc504b 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
@@ -90,10 +89,9 @@ 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
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