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

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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: Konrad 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: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Konrad Rzeszutek Wilk 2013-02-25 15:54:10 -05:00 committed by H. Peter Anvin
parent a2fd641917
commit 1256276c98
1 changed files with 2 additions and 2 deletions
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4
arch/x86/kernel/head_64.S
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@ -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.