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nds32: nds32 FPU port

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This patch set contains basic components for supporting the nds32 FPU,
such as exception handlers and context switch for FPU registers. By
default, the lazy FPU scheme is supported and the user can configure it via
CONFIG_LZAY_FPU.

Signed-off-by: Vincent Chen <vincentc@andestech.com>
Acked-by: Greentime Hu <greentime@andestech.com>
Signed-off-by: Greentime Hu <greentime@andestech.com>
This commit is contained in:
Vincent Chen
2018-11-22 11:14:34 +08:00
committed by Greentime Hu
parent 4f014a41b4
commit e46bf83c18
17 changed files with 589 additions and 16 deletions
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7
arch/nds32/include/asm/processor.h
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@@ -35,6 +35,8 @@ struct thread_struct {
unsigned long address;
unsigned long trap_no;
unsigned long error_code;
struct fpu_struct fpu;
};
#define INIT_THREAD { }
@@ -72,6 +74,11 @@ struct task_struct;
/* Free all resources held by a thread. */
#define release_thread(thread) do { } while(0)
#if IS_ENABLED(CONFIG_FPU)
#if !IS_ENABLED(CONFIG_UNLAZU_FPU)
extern struct task_struct *last_task_used_math;
#endif
#endif
/* Prepare to copy thread state - unlazy all lazy status */
#define prepare_to_copy(tsk) do { } while (0)