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2010-02-10 Colin King <colin.king@ubuntu.com>

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2010-02-10  Colin Watson  <cjwatson@ubuntu.com>

	Shrink the pre-partition-table part of boot.img by eight bytes.

	* boot/i386/pc/boot.S (ERR): New macro.
	(chs_mode): Use ERR.
	(geometry_error): Likewise.
	(hd_probe_error): Remove.  This is only used once, so we wrwite
	it inline instead.
	(read_error): Instead of printing read_error_string, just set up
	%si and fall through to ...
	(error_message): ... this new function, also used by ERR.
This commit is contained in:
Colin Watson 2010-02-22 12:42:13 +00:00
parent 618307dd08
commit 33dfc52f44
2 changed files with 19 additions and 12 deletions
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13
ChangeLog.trim-boot-img Normal file
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@ -0,0 +1,13 @@
2010-02-10 Colin King <colin.king@ubuntu.com>
2010-02-10 Colin Watson <cjwatson@ubuntu.com>
Shrink the pre-partition-table part of boot.img by eight bytes.
* boot/i386/pc/boot.S (ERR): New macro.
(chs_mode): Use ERR.
(geometry_error): Likewise.
(hd_probe_error): Remove. This is only used once, so we wrwite
it inline instead.
(read_error): Instead of printing read_error_string, just set up
%si and fall through to ...
(error_message): ... this new function, also used by ERR.

18
boot/i386/pc/boot.S
View file

@ -27,6 +27,7 @@
/* Print message string */ /* Print message string */
#define MSG(x) movw $x, %si; call LOCAL(message) #define MSG(x) movw $x, %si; call LOCAL(message)
#define ERR(x) movw $x, %si; jmp LOCAL(error_message)
.file "boot.S" .file "boot.S"
@ -233,7 +234,7 @@ LOCAL(chs_mode):
jz LOCAL(floppy_probe) jz LOCAL(floppy_probe)
/* Nope, we definitely have a hard disk, and we're screwed. */ /* Nope, we definitely have a hard disk, and we're screwed. */
jmp LOCAL(hd_probe_error) ERR(hd_probe_error_string)
LOCAL(final_init): LOCAL(final_init):
/* set the mode to zero */ /* set the mode to zero */
@ -360,22 +361,15 @@ LOCAL(copy_buffer):
* BIOS Geometry translation error (past the end of the disk geometry!). * BIOS Geometry translation error (past the end of the disk geometry!).
*/ */
LOCAL(geometry_error): LOCAL(geometry_error):
MSG(geometry_error_string) ERR(geometry_error_string)
jmp LOCAL(general_error)
/*
* Disk probe failure.
*/
LOCAL(hd_probe_error):
MSG(hd_probe_error_string)
jmp LOCAL(general_error)
/* /*
* Read error on the disk. * Read error on the disk.
*/ */
LOCAL(read_error): LOCAL(read_error):
MSG(read_error_string) movw $read_error_string, %si
LOCAL(error_message):
call LOCAL(message)
LOCAL(general_error): LOCAL(general_error):
MSG(general_error_string) MSG(general_error_string)