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authorLennert Buytenhek <buytenh@wantstofly.org>2006-12-03 18:51:14 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-12-03 17:52:22 +0000
commitafe4b25e7d9260d85fccb2d13c9933a987bdfc8a (patch)
tree9b603e52ef91531089b45e5860e89d91d2e01565 /arch/arm/Kconfig
parentf5236225a3858b505221a59233af1f1158be9139 (diff)
[ARM] 3881/4: xscale: clean up cp0/cp1 handling
XScale cores either have a DSP coprocessor (which contains a single 40 bit accumulator register), or an iWMMXt coprocessor (which contains eight 64 bit registers.) Because of the small amount of state in the DSP coprocessor, access to the DSP coprocessor (CP0) is always enabled, and DSP context switching is done unconditionally on every task switch. Access to the iWMMXt coprocessor (CP0/CP1) is enabled only when an iWMMXt instruction is first issued, and iWMMXt context switching is done lazily. CONFIG_IWMMXT is supposed to mean 'the cpu we will be running on will have iWMMXt support', but boards are supposed to select this config symbol by hand, and at least one pxa27x board doesn't get this right, so on that board, proc-xscale.S will incorrectly assume that we have a DSP coprocessor, enable CP0 on boot, and we will then only save the first iWMMXt register (wR0) on context switches, which is Bad. This patch redefines CONFIG_IWMMXT as 'the cpu we will be running on might have iWMMXt support, and we will enable iWMMXt context switching if it does.' This means that with this patch, running a CONFIG_IWMMXT=n kernel on an iWMMXt-capable CPU will no longer potentially corrupt iWMMXt state over context switches, and running a CONFIG_IWMMXT=y kernel on a non-iWMMXt capable CPU will still do DSP context save/restore. These changes should make iWMMXt work on PXA3xx, and as a side effect, enable proper acc0 save/restore on non-iWMMXt capable xsc3 cores such as IOP13xx and IXP23xx (which will not have CONFIG_CPU_XSCALE defined), as well as setting and using HWCAP_IWMMXT properly. Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> Acked-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/Kconfig')
-rw-r--r--arch/arm/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index ce00c570459..7be67ef4b84 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -374,6 +374,14 @@ config PLAT_IOP
source arch/arm/mm/Kconfig
+config IWMMXT
+ bool "Enable iWMMXt support"
+ depends CPU_XSCALE || CPU_XSC3
+ default y if PXA27x
+ help
+ Enable support for iWMMXt context switching at run time if
+ running on a CPU that supports it.
+
# bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
config XSCALE_PMU
bool