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x86: remove zImage support

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Impact: obsolete feature removal

The zImage kernel format has been functionally unused for a very long
time.  It is just barely possible to build a modern kernel that still
fits within the zImage size limit, but it is highly unlikely that
anyone ever uses it.  Furthermore, although it is still supported by
most bootloaders, it has been at best poorly tested (or not tested at
all); some bootloaders are even known to not support zImage at all and
not having even noticed.

Also remove some really obsolete constants that no longer have any
meaning.

LKML-Reference: <49B703D4.1000008@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
H. Peter Anvin 2009-03-11 10:55:33 -07:00
parent 78b020d035
commit 5e47c478b0
5 changed files with 18 additions and 91 deletions
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44
arch/x86/boot/pm.c
View file

@ -32,47 +32,6 @@ static void realmode_switch_hook(void)
}
}
/*
* A zImage kernel is loaded at 0x10000 but wants to run at 0x1000.
* A bzImage kernel is loaded and runs at 0x100000.
*/
static void move_kernel_around(void)
{
/* Note: rely on the compile-time option here rather than
the LOADED_HIGH flag. The Qemu kernel loader unconditionally
sets the loadflags to zero. */
#ifndef __BIG_KERNEL__
u16 dst_seg, src_seg;
u32 syssize;
dst_seg = 0x1000 >> 4;
src_seg = 0x10000 >> 4;
syssize = boot_params.hdr.syssize; /* Size in 16-byte paragraphs */
while (syssize) {
int paras = (syssize >= 0x1000) ? 0x1000 : syssize;
int dwords = paras << 2;
asm volatile("pushw %%es ; "
"pushw %%ds ; "
"movw %1,%%es ; "
"movw %2,%%ds ; "
"xorw %%di,%%di ; "
"xorw %%si,%%si ; "
"rep;movsl ; "
"popw %%ds ; "
"popw %%es"
: "+c" (dwords)
: "r" (dst_seg), "r" (src_seg)
: "esi", "edi");
syssize -= paras;
dst_seg += paras;
src_seg += paras;
}
#endif
}
/*
* Disable all interrupts at the legacy PIC.
*/
@ -147,9 +106,6 @@ void go_to_protected_mode(void)
/* Hook before leaving real mode, also disables interrupts */
realmode_switch_hook();
/* Move the kernel/setup to their final resting places */
move_kernel_around();
/* Enable the A20 gate */
if (enable_a20()) {
puts("A20 gate not responding, unable to boot...\n");