[PATCH v3 4/4] kexec, x86_64: Load bzImage64 above 4G

[H. Peter Anvin]

On 11/21/2012 06:37 AM, Vivek Goyal wrote:
> On Tue, Nov 20, 2012 at 11:31:38PM -0800, Yinghai Lu wrote:
>
> [..]
>> +	/* avoid cross GB boundary */
>> +	align = real_mode->kernel_alignment;
>> +	addr = locate_hole(info, size, align, 0x100000, -1, -1);
>> +	if (addr == ULONG_MAX)
>> +		die("can not load bzImage64");
>> +	/* same GB ? */
>> +	while ((addr >> 30) != ((addr + size - 1) >> 30)) {
>> +		addr = locate_hole(info, size, align, 0x100000,
>> +				 round_down(addr + size - 1, (1UL<<30)), -1);
>> +		if (addr == ULONG_MAX)
>> +			die("can not load bzImage64");
>> +	}
>> +	dbgprintf("Found kernel buffer at %lx size %lx\n", addr, size);
>
> Where does this limitation of not loading kernel across GB boundary come
> from?
>

Seriously... that is bizarre.

	-hpa


-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.