Commit 9693a853 authored by Franck Bui-Huu's avatar Franck Bui-Huu Committed by Ralf Baechle
Browse files

[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: default avatarFranck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 9654640d

arch/mips/Kconfig

+18 −0
Original line number Diff line number Diff line
@@ -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

arch/mips/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -103,6 +103,8 @@ predef-le += -DMIPSEL -D_MIPSEL -D__MIPSEL -D__MIPSEL__ 
cflags-$(CONFIG_CPU_BIG_ENDIAN)		+= $(shell $(CC) -dumpmachine |grep -q 'mips.*el-.*' && echo -EB $(undef-all) $(predef-be))

cflags-$(CONFIG_CPU_LITTLE_ENDIAN)	+= $(shell $(CC) -dumpmachine |grep -q 'mips.*el-.*' || echo -EL $(undef-all) $(predef-le))



cflags-$(CONFIG_CPU_HAS_SMARTMIPS)	+= $(call cc-option,-msmartmips)



cflags-$(CONFIG_SB1XXX_CORELIS)	+= $(call cc-option,-mno-sched-prolog) \

				   -fno-omit-frame-pointer

arch/mips/configs/atlas_defconfig

+2 −0
Original line number Diff line number Diff line
@@ -139,10 +139,12 @@ CONFIG_MIPS_MT_DISABLED=y 
CONFIG_SYS_SUPPORTS_MULTITHREADING=y

# CONFIG_64BIT_PHYS_ADDR is not set

CONFIG_CPU_HAS_LLSC=y

# CONFIG_CPU_HAS_SMARTMIPS is not set

CONFIG_CPU_HAS_SYNC=y

CONFIG_GENERIC_HARDIRQS=y

CONFIG_GENERIC_IRQ_PROBE=y

CONFIG_CPU_SUPPORTS_HIGHMEM=y

CONFIG_SYS_SUPPORTS_SMARTMIPS=y

CONFIG_ARCH_FLATMEM_ENABLE=y

CONFIG_SELECT_MEMORY_MODEL=y

CONFIG_FLATMEM_MANUAL=y

arch/mips/configs/bigsur_defconfig

+3 −2
Original line number Diff line number Diff line 
#

# Automatically generated make config: don't edit

# Linux kernel version: 2.6.20

# Sun Feb 18 21:27:35 2007

# Tue Feb 20 21:47:22 2007

#

CONFIG_MIPS=y
@@ -417,6 +417,7 @@ CONFIG_PREVENT_FIRMWARE_BUILD=y 
#

# Plug and Play support

#

# CONFIG_PNPACPI is not set



#

# Block devices
@@ -589,6 +590,7 @@ CONFIG_NET_SB1250_MAC=y 
# CONFIG_TIGON3 is not set

# CONFIG_BNX2 is not set

# CONFIG_QLA3XXX is not set

# CONFIG_ATL1 is not set



#

# Ethernet (10000 Mbit)
@@ -1025,7 +1027,6 @@ CONFIG_FORCED_INLINING=y 
CONFIG_CROSSCOMPILE=y

CONFIG_CMDLINE=""

# CONFIG_DEBUG_STACK_USAGE is not set

# CONFIG_KGDB is not set

# CONFIG_SB1XXX_CORELIS is not set

# CONFIG_RUNTIME_DEBUG is not set

arch/mips/configs/capcella_defconfig

+2 −1
Original line number Diff line number Diff line 
#

# Automatically generated make config: don't edit

# Linux kernel version: 2.6.20

# Sun Feb 18 21:27:36 2007

# Tue Feb 20 21:47:22 2007

#

CONFIG_MIPS=y
@@ -388,6 +388,7 @@ CONFIG_CONNECTOR=m 
#

# Plug and Play support

#

# CONFIG_PNPACPI is not set



#

# Block devices

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