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authorFranck Bui-Huu <fbuihuu@gmail.com>2007-02-02 17:41:47 +0100
committerRalf Baechle <ralf@linux-mips.org>2007-02-22 00:50:44 +0000
commit9693a85378b590cc7a4aa2db2174422585c7c8c4 (patch)
tree43d031f8e555d9276e68bdb158bd264c2d260346 /arch/mips/Kconfig
parent9654640d0af8f2de40ff3807d3695109d3463f54 (diff)
[MIPS] Add basic SMARTMIPS ASE support
This patch adds trivial support for SMARTMIPS extension. This extension is currently implemented by 4KS[CD] CPUs. Basically it saves/restores ACX register, which is part of the SMARTMIPS ASE, when needed. This patch does *not* add any support for Smartmips MMU features. Futhermore this patch does not add explicit support for 4KS[CD] CPUs since they are respectively mips32 and mips32r2 compliant. So with the current processor configuration, a platform that has such CPUs needs to select both configs: CPU_HAS_SMARTMIPS SYS_HAS_CPU_MIPS32_R[12] This is due to the processor configuration which is mixing up all the architecture variants and the processor types. The drawback of this, is that we currently pass '-march=mips32' option to gcc when building a kernel instead of '-march=4ksc' for 4KSC case. This can lead to a kernel image a little bit bigger than required. Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/Kconfig')
-rw-r--r--arch/mips/Kconfig18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index c6f74f1c639..58e97886d77 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -274,6 +274,7 @@ config MIPS_ATLAS
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_LITTLE_ENDIAN
select SYS_SUPPORTS_MULTITHREADING if EXPERIMENTAL
+ select SYS_SUPPORTS_SMARTMIPS
select GENERIC_HARDIRQS_NO__DO_IRQ
help
This enables support for the MIPS Technologies Atlas evaluation
@@ -305,6 +306,7 @@ config MIPS_MALTA
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_LITTLE_ENDIAN
select SYS_SUPPORTS_MULTITHREADING
+ select SYS_SUPPORTS_SMARTMIPS
help
This enables support for the MIPS Technologies Malta evaluation
board.
@@ -322,6 +324,7 @@ config MIPS_SEAD
select SYS_SUPPORTS_64BIT_KERNEL if EXPERIMENTAL
select SYS_SUPPORTS_BIG_ENDIAN
select SYS_SUPPORTS_LITTLE_ENDIAN
+ select SYS_SUPPORTS_SMARTMIPS
help
This enables support for the MIPS Technologies SEAD evaluation
board.
@@ -1641,6 +1644,18 @@ config 64BIT_PHYS_ADDR
config CPU_HAS_LLSC
bool
+config CPU_HAS_SMARTMIPS
+ depends on SYS_SUPPORTS_SMARTMIPS
+ bool "Support for the SmartMIPS ASE"
+ help
+ SmartMIPS is a extension of the MIPS32 architecture aimed at
+ increased security at both hardware and software level for
+ smartcards. Enabling this option will allow proper use of the
+ SmartMIPS instructions by Linux applications. However a kernel with
+ this option will not work on a MIPS core without SmartMIPS core. If
+ you don't know you probably don't have SmartMIPS and should say N
+ here.
+
config CPU_HAS_WB
bool
@@ -1704,6 +1719,9 @@ config CPU_SUPPORTS_HIGHMEM
config SYS_SUPPORTS_HIGHMEM
bool
+config SYS_SUPPORTS_SMARTMIPS
+ bool
+
config ARCH_FLATMEM_ENABLE
def_bool y
depends on !NUMA