BIOS_BEGIN
e820__range_remove(BIOS_BEGIN, BIOS_END - BIOS_BEGIN, E820_TYPE_RAM);
if (pcibios_enabled && st->start_address >= PAGE_OFFSET + BIOS_BEGIN &&
#define BIOS_PFN PFN_DOWN(BIOS_BEGIN)
set_memory_x(PAGE_OFFSET + BIOS_BEGIN, (BIOS_END - BIOS_BEGIN) >> PAGE_SHIFT);