arch/arm/vfp/vfpinstr.h

Source file repositories/reference/linux-study-clean/arch/arm/vfp/vfpinstr.h

File Facts

System
Linux kernel
Corpus path
arch/arm/vfp/vfpinstr.h
Extension
.h
Size
2602 bytes
Lines
83
Domain
Architecture Layer
Bucket
arch/arm
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

#define INST_CPRTDO(inst)	(((inst) & 0x0f000000) == 0x0e000000)
#define INST_CPRT(inst)		((inst) & (1 << 4))
#define INST_CPRT_L(inst)	((inst) & (1 << 20))
#define INST_CPRT_Rd(inst)	(((inst) & (15 << 12)) >> 12)
#define INST_CPRT_OP(inst)	(((inst) >> 21) & 7)
#define INST_CPNUM(inst)	((inst) & 0xf00)
#define CPNUM(cp)		((cp) << 8)

#define FOP_MASK	(0x00b00040)
#define FOP_FMAC	(0x00000000)
#define FOP_FNMAC	(0x00000040)
#define FOP_FMSC	(0x00100000)
#define FOP_FNMSC	(0x00100040)
#define FOP_FMUL	(0x00200000)
#define FOP_FNMUL	(0x00200040)
#define FOP_FADD	(0x00300000)
#define FOP_FSUB	(0x00300040)
#define FOP_FDIV	(0x00800000)
#define FOP_EXT		(0x00b00040)

#define FOP_TO_IDX(inst)	((inst & 0x00b00000) >> 20 | (inst & (1 << 6)) >> 4)

#define FEXT_MASK	(0x000f0080)
#define FEXT_FCPY	(0x00000000)
#define FEXT_FABS	(0x00000080)
#define FEXT_FNEG	(0x00010000)
#define FEXT_FSQRT	(0x00010080)
#define FEXT_FCMP	(0x00040000)
#define FEXT_FCMPE	(0x00040080)
#define FEXT_FCMPZ	(0x00050000)
#define FEXT_FCMPEZ	(0x00050080)
#define FEXT_FCVT	(0x00070080)
#define FEXT_FUITO	(0x00080000)
#define FEXT_FSITO	(0x00080080)
#define FEXT_FTOUI	(0x000c0000)
#define FEXT_FTOUIZ	(0x000c0080)
#define FEXT_FTOSI	(0x000d0000)
#define FEXT_FTOSIZ	(0x000d0080)

#define FEXT_TO_IDX(inst)	((inst & 0x000f0000) >> 15 | (inst & (1 << 7)) >> 7)

#define vfp_get_sd(inst)	((inst & 0x0000f000) >> 11 | (inst & (1 << 22)) >> 22)
#define vfp_get_dd(inst)	((inst & 0x0000f000) >> 12 | (inst & (1 << 22)) >> 18)
#define vfp_get_sm(inst)	((inst & 0x0000000f) << 1 | (inst & (1 << 5)) >> 5)
#define vfp_get_dm(inst)	((inst & 0x0000000f) | (inst & (1 << 5)) >> 1)
#define vfp_get_sn(inst)	((inst & 0x000f0000) >> 15 | (inst & (1 << 7)) >> 7)
#define vfp_get_dn(inst)	((inst & 0x000f0000) >> 16 | (inst & (1 << 7)) >> 3)

#define vfp_single(inst)	(((inst) & 0x0000f00) == 0xa00)

#define FPSCR_N	(1 << 31)
#define FPSCR_Z	(1 << 30)
#define FPSCR_C (1 << 29)
#define FPSCR_V	(1 << 28)

#define fmrx(_vfp_) ({				\
	u32 __v;				\
	asm volatile (".fpu	vfpv2\n"	\
		      "vmrs	%0, " #_vfp_	\
		     : "=r" (__v) : : "cc");	\
	__v;					\
})

#define fmxr(_vfp_, _var_) ({			\
	asm volatile (".fpu	vfpv2\n"	\
		      "vmsr	" #_vfp_ ", %0"	\
		     : : "r" (_var_) : "cc");	\
})

u32 vfp_single_cpdo(u32 inst, u32 fpscr);
u32 vfp_single_cprt(u32 inst, u32 fpscr, struct pt_regs *regs);

u32 vfp_double_cpdo(u32 inst, u32 fpscr);

Annotation

Implementation Notes