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

[Vivek Goyal]

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?

Vivek