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Commit 1256276c authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk Committed by H. Peter Anvin
Browse files

x86, doc: Fix incorrect comment about 64-bit code segment descriptors 



The AMD64 Architecture Programmer's Manual Volume 2, on page
89 mentions: "If the processor is running in 64-bit mode (L=1),
the only valid setting of the D bit is 0." This matches
with what the code does.

Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Link: http://lkml.kernel.org/r/1361825650-14031-4-git-send-email-konrad.wilk@oracle.com


Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent a2fd6419

arch/x86/kernel/head_64.S

+2 −2
Original line number Diff line number Diff line
@@ -49,7 +49,7 @@ L3_START_KERNEL = pud_index(__START_KERNEL_map) 
startup_64:



	/*

	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 1,

	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,

	 * and someone has loaded an identity mapped page table

	 * for us.  These identity mapped page tables map all of the

	 * kernel pages and possibly all of memory.
@@ -146,7 +146,7 @@ ident_complete: 
	jmp secondary_startup_64

ENTRY(secondary_startup_64)

	/*

	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 1,

	 * At this point the CPU runs in 64bit mode CS.L = 1 CS.D = 0,

	 * and someone has loaded a mapped page table.

	 *

	 * %esi holds a physical pointer to real_mode_data.