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MIPS: 64-bit: Detect virtual memory size

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Linux kernel 2.6.32 and later allocate address space from the top of the
kernel virtual memory address space.

This patch implements virtual memory size detection for 64 bit MIPS CPUs
to avoid resulting crashes.

Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Cc: linux-mips@linux-mips.org
Patchwork: http://patchwork.linux-mips.org/patch/935/
Reviewed-by: David Daney <ddaney@caviumnetworks.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Guenter Roeck
2010-02-02 08:52:20 -08:00
committed by Ralf Baechle
parent ba284b1f19
commit 91dfc423cc
4 changed files with 24 additions and 1 deletions
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3
arch/mips/include/asm/cpu-info.h
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@ -58,6 +58,9 @@ struct cpuinfo_mips {
struct cache_desc tcache; /* Tertiary/split secondary cache */
int srsets; /* Shadow register sets */
int core; /* physical core number */
#ifdef CONFIG_64BIT
int vmbits; /* Virtual memory size in bits */
#endif
#if defined(CONFIG_MIPS_MT_SMP) || defined(CONFIG_MIPS_MT_SMTC)
/*
* In the MIPS MT "SMTC" model, each TC is considered