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authorLinus Torvalds <torvalds@linux-foundation.org>2010-03-01 09:15:15 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-01 09:15:15 -0800
commitac0f6f927db539e03e1f3f61bcd4ed57d5cde7a9 (patch)
tree816e5ac643b15c2050c64a7075f0f7e13d86ea09 /arch/arm/vfp
parentb1bf9368407ae7e89d8a005bb40beb70a41df539 (diff)
parent9f33be2c3a80bdc2cc08342dd77fac87652e0548 (diff)
downloadlinux-ac0f6f927db539e03e1f3f61bcd4ed57d5cde7a9.tar.bz2
Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
* 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm: (100 commits) ARM: Eliminate decompressor -Dstatic= PIC hack ARM: 5958/1: ARM: U300: fix inverted clk round rate ARM: 5956/1: misplaced parentheses ARM: 5955/1: ep93xx: move timer defines into core.c and document ARM: 5954/1: ep93xx: move gpio interrupt support to gpio.c ARM: 5953/1: ep93xx: fix broken build of clock.c ARM: 5952/1: ARM: MM: Add ARM_L1_CACHE_SHIFT_6 for handle inside each ARCH Kconfig ARM: 5949/1: NUC900 add gpio virtual memory map ARM: 5948/1: Enable timer0 to time4 clock support for nuc910 ARM: 5940/2: ARM: MMCI: remove custom DBG macro and printk ARM: make_coherent(): fix problems with highpte, part 2 MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself ARM: 5945/1: ep93xx: include correct irq.h in core.c ARM: 5933/1: amba-pl011: support hardware flow control ARM: 5930/1: Add PKMAP area description to memory.txt. ARM: 5929/1: Add checks to detect overlap of memory regions. ARM: 5928/1: Change type of VMALLOC_END to unsigned long. ARM: 5927/1: Make delimiters of DMA area globally visibly. ARM: 5926/1: Add "Virtual kernel memory..." printout. ARM: 5920/1: OMAP4: Enable L2 Cache ... Fix up trivial conflict in arch/arm/mach-mx25/clock.c
Diffstat (limited to 'arch/arm/vfp')
-rw-r--r--arch/arm/vfp/vfpmodule.c55
1 files changed, 36 insertions, 19 deletions
diff --git a/arch/arm/vfp/vfpmodule.c b/arch/arm/vfp/vfpmodule.c
index a63c4be99b36..7f3f59fcaa21 100644
--- a/arch/arm/vfp/vfpmodule.c
+++ b/arch/arm/vfp/vfpmodule.c
@@ -433,7 +433,11 @@ static inline void vfp_pm_init(void) { }
* saved one. This function is used by the ptrace mechanism.
*/
#ifdef CONFIG_SMP
-void vfp_sync_state(struct thread_info *thread)
+void vfp_sync_hwstate(struct thread_info *thread)
+{
+}
+
+void vfp_flush_hwstate(struct thread_info *thread)
{
/*
* On SMP systems, the VFP state is automatically saved at every
@@ -444,35 +448,48 @@ void vfp_sync_state(struct thread_info *thread)
thread->vfpstate.hard.cpu = NR_CPUS;
}
#else
-void vfp_sync_state(struct thread_info *thread)
+void vfp_sync_hwstate(struct thread_info *thread)
{
unsigned int cpu = get_cpu();
- u32 fpexc = fmrx(FPEXC);
/*
- * If VFP is enabled, the previous state was already saved and
- * last_VFP_context updated.
+ * If the thread we're interested in is the current owner of the
+ * hardware VFP state, then we need to save its state.
*/
- if (fpexc & FPEXC_EN)
- goto out;
+ if (last_VFP_context[cpu] == &thread->vfpstate) {
+ u32 fpexc = fmrx(FPEXC);
- if (!last_VFP_context[cpu])
- goto out;
+ /*
+ * Save the last VFP state on this CPU.
+ */
+ fmxr(FPEXC, fpexc | FPEXC_EN);
+ vfp_save_state(&thread->vfpstate, fpexc | FPEXC_EN);
+ fmxr(FPEXC, fpexc);
+ }
- /*
- * Save the last VFP state on this CPU.
- */
- fmxr(FPEXC, fpexc | FPEXC_EN);
- vfp_save_state(last_VFP_context[cpu], fpexc);
- fmxr(FPEXC, fpexc);
+ put_cpu();
+}
+
+void vfp_flush_hwstate(struct thread_info *thread)
+{
+ unsigned int cpu = get_cpu();
/*
- * Set the context to NULL to force a reload the next time the thread
- * uses the VFP.
+ * If the thread we're interested in is the current owner of the
+ * hardware VFP state, then we need to save its state.
*/
- last_VFP_context[cpu] = NULL;
+ if (last_VFP_context[cpu] == &thread->vfpstate) {
+ u32 fpexc = fmrx(FPEXC);
+
+ fmxr(FPEXC, fpexc & ~FPEXC_EN);
+
+ /*
+ * Set the context to NULL to force a reload the next time
+ * the thread uses the VFP.
+ */
+ last_VFP_context[cpu] = NULL;
+ }
-out:
put_cpu();
}
#endif