aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/include
diff options
context:
space:
mode:
authorGuenter Roeck <guenter.roeck@ericsson.com>2010-02-02 08:52:20 -0800
committerRalf Baechle <ralf@linux-mips.org>2010-02-02 19:56:23 +0100
commit91dfc423cc8cfd399fb308a837102a7ab7fa067e (patch)
tree21c75672185153084a5ac8e38ca3938ca0cf4ac1 /arch/mips/include
parentba284b1f199ef7121489010da6614561a679eab6 (diff)
downloadlinux-2.6.34-ux500-91dfc423cc8cfd399fb308a837102a7ab7fa067e.tar.gz
MIPS: 64-bit: Detect virtual memory size
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>
Diffstat (limited to 'arch/mips/include')
-rw-r--r--arch/mips/include/asm/cpu-features.h7
-rw-r--r--arch/mips/include/asm/cpu-info.h3
-rw-r--r--arch/mips/include/asm/pgtable-64.h4
3 files changed, 13 insertions, 1 deletions
diff --git a/arch/mips/include/asm/cpu-features.h b/arch/mips/include/asm/cpu-features.h
index 1f4df647c38..272c5ef35bb 100644
--- a/arch/mips/include/asm/cpu-features.h
+++ b/arch/mips/include/asm/cpu-features.h
@@ -191,6 +191,9 @@
# ifndef cpu_has_64bit_addresses
# define cpu_has_64bit_addresses 0
# endif
+# ifndef cpu_vmbits
+# define cpu_vmbits 31
+# endif
#endif
#ifdef CONFIG_64BIT
@@ -209,6 +212,10 @@
# ifndef cpu_has_64bit_addresses
# define cpu_has_64bit_addresses 1
# endif
+# ifndef cpu_vmbits
+# define cpu_vmbits cpu_data[0].vmbits
+# define __NEED_VMBITS_PROBE
+# endif
#endif
#if defined(CONFIG_CPU_MIPSR2_IRQ_VI) && !defined(cpu_has_vint)
diff --git a/arch/mips/include/asm/cpu-info.h b/arch/mips/include/asm/cpu-info.h
index 126044308de..b39def3f6e0 100644
--- a/arch/mips/include/asm/cpu-info.h
+++ b/arch/mips/include/asm/cpu-info.h
@@ -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
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h
index 9cd50899395..8eda30b467d 100644
--- a/arch/mips/include/asm/pgtable-64.h
+++ b/arch/mips/include/asm/pgtable-64.h
@@ -110,7 +110,9 @@
#define VMALLOC_START MAP_BASE
#define VMALLOC_END \
(VMALLOC_START + \
- PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE - (1UL << 32))
+ min(PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE, \
+ (1UL << cpu_vmbits)) - (1UL << 32))
+
#if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \
VMALLOC_START != CKSSEG
/* Load modules into 32bit-compatible segment. */