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authorSuresh Siddha <suresh.b.siddha@intel.com>2008-03-10 15:28:04 -0700
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:19:55 +0200
commit61c4628b538608c1a85211ed8438136adfeb9a95 (patch)
tree290a695299a363153bc692e6d705ac680d64359e /include/asm-x86/processor.h
parentfa5c4639419668cbb18ca3d20c1253559a3b43ae (diff)
x86, fpu: split FPU state from task struct - v5
Split the FPU save area from the task struct. This allows easy migration of FPU context, and it's generally cleaner. It also allows the following two optimizations: 1) only allocate when the application actually uses FPU, so in the first lazy FPU trap. This could save memory for non-fpu using apps. Next patch does this lazy allocation. 2) allocate the right size for the actual cpu rather than 512 bytes always. Patches enabling xsave/xrstor support (coming shortly) will take advantage of this. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/asm-x86/processor.h')
-rw-r--r--include/asm-x86/processor.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/asm-x86/processor.h b/include/asm-x86/processor.h
index eaf4548a23d2..99d297885780 100644
--- a/include/asm-x86/processor.h
+++ b/include/asm-x86/processor.h
@@ -354,7 +354,7 @@ struct i387_soft_struct {
u32 entry_eip;
};
-union i387_union {
+union thread_xstate {
struct i387_fsave_struct fsave;
struct i387_fxsave_struct fxsave;
struct i387_soft_struct soft;
@@ -365,6 +365,7 @@ DECLARE_PER_CPU(struct orig_ist, orig_ist);
#endif
extern void print_cpu_info(struct cpuinfo_x86 *);
+extern unsigned int xstate_size;
extern void init_scattered_cpuid_features(struct cpuinfo_x86 *c);
extern unsigned int init_intel_cacheinfo(struct cpuinfo_x86 *c);
extern unsigned short num_cache_leaves;
@@ -397,8 +398,8 @@ struct thread_struct {
unsigned long cr2;
unsigned long trap_no;
unsigned long error_code;
- /* Floating point info: */
- union i387_union i387 __attribute__((aligned(16)));;
+ /* floating point and extended processor state */
+ union thread_xstate *xstate;
#ifdef CONFIG_X86_32
/* Virtual 86 mode info */
struct vm86_struct __user *vm86_info;