x86, kaslr: Clarify RANDOMIZE_BASE_MAX_OFFSET

	   possible. At best, due to page table layouts, 64-bit can use

	   9 bits of entropy and 32-bit uses 8 bits.

	   If unsure, say N.

config RANDOMIZE_BASE_MAX_OFFSET

	hex "Maximum ASLR offset allowed"

	hex "Maximum kASLR offset allowed" if EXPERT

	depends on RANDOMIZE_BASE

	range 0x0 0x20000000 if X86_32

	default "0x20000000" if X86_32

	range 0x0 0x40000000 if X86_64

	default "0x40000000" if X86_64

	---help---

	 Determines the maximal offset in bytes that will be applied to the

	 kernel when Address Space Layout Randomization (ASLR) is active.

	 Must be less than or equal to the actual physical memory on the

	 system. This must be a multiple of CONFIG_PHYSICAL_ALIGN.

	  The lesser of RANDOMIZE_BASE_MAX_OFFSET and available physical

	  memory is used to determine the maximal offset in bytes that will

	  be applied to the kernel when kernel Address Space Layout

	  Randomization (kASLR) is active. This must be a multiple of

	  PHYSICAL_ALIGN.

	 On 32-bit this is limited to 512MiB.

	  On 32-bit this is limited to 512MiB by page table layouts. The

	  default is 512MiB.

	  On 64-bit this is limited by how the kernel fixmap page table is

	 positioned, so this cannot be larger that 1GiB currently. Normally

	 there is a 512MiB to 1.5GiB split between kernel and modules. When

	 this is raised above the 512MiB default, the modules area will

	 shrink to compensate, up to the current maximum 1GiB to 1GiB split.

	  positioned, so this cannot be larger than 1GiB currently. Without

	  RANDOMIZE_BASE, there is a 512MiB to 1.5GiB split between kernel

	  and modules. When RANDOMIZE_BASE_MAX_OFFSET is above 512MiB, the

	  modules area will shrink to compensate, up to the current maximum

	  1GiB to 1GiB split. The default is 1GiB.

	  If unsure, leave at the default value.

# Relocation on x86 needs some additional build support

config X86_NEED_RELOCS