arch/arc/include/asm/fpu.h

Source file repositories/reference/linux-study-clean/arch/arc/include/asm/fpu.h

File Facts

System
Linux kernel
Corpus path
arch/arc/include/asm/fpu.h
Extension
.h
Size
1125 bytes
Lines
58
Domain
Architecture Layer
Bucket
arch/arc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

struct arc_fpu {
	struct {
		unsigned int l, h;
	} aux_dpfp[2];
};

#define fpu_init_task(regs)

#else

/*
 * ARCv2 FPU Control aux register
 *   - bits to enable Traps on Exceptions
 *   - Rounding mode
 *
 * ARCv2 FPU Status aux register
 *   - FPU exceptions flags (Inv, Div-by-Zero, overflow, underflow, inexact)
 *   - Flag Write Enable to clear flags explicitly (vs. by fpu instructions
 *     only
 */

struct arc_fpu {
	unsigned int ctrl, status;
};

extern void fpu_init_task(struct pt_regs *regs);

#endif	/* !CONFIG_ISA_ARCOMPACT */

struct task_struct;

extern void fpu_save_restore(struct task_struct *p, struct task_struct *n);

#else	/* !CONFIG_ARC_FPU_SAVE_RESTORE */

#define fpu_save_restore(p, n)
#define fpu_init_task(regs)

#endif	/* CONFIG_ARC_FPU_SAVE_RESTORE */

#endif	/* _ASM_ARC_FPU_H */

Annotation

Implementation Notes