arch/alpha/math-emu/sfp-util.h

Source file repositories/reference/linux-study-clean/arch/alpha/math-emu/sfp-util.h

File Facts

System
Linux kernel
Corpus path
arch/alpha/math-emu/sfp-util.h
Extension
.h
Size
1008 bytes
Lines
37
Domain
Architecture Layer
Bucket
arch/alpha
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

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <asm/byteorder.h>
#include <asm/fpu.h>

#define add_ssaaaa(sh, sl, ah, al, bh, bl) \
  ((sl) = (al) + (bl), (sh) = (ah) + (bh) + ((sl) < (al)))

#define sub_ddmmss(sh, sl, ah, al, bh, bl) \
  ((sl) = (al) - (bl), (sh) = (ah) - (bh) - ((al) < (bl)))

#define umul_ppmm(wh, wl, u, v)			\
  __asm__ ("mulq %2,%3,%1; umulh %2,%3,%0"	\
	   : "=r" ((UDItype)(wh)),		\
	     "=&r" ((UDItype)(wl))		\
	   : "r" ((UDItype)(u)),		\
	     "r" ((UDItype)(v)))

#define udiv_qrnnd(q, r, n1, n0, d)				\
  do { unsigned long __r;					\
    (q) = __udiv_qrnnd (&__r, (n1), (n0), (d));			\
    (r) = __r;							\
  } while (0)
extern unsigned long __udiv_qrnnd (unsigned long *, unsigned long,
				   unsigned long , unsigned long);

#define UDIV_NEEDS_NORMALIZATION 1  

#define abort()			goto bad_insn

#ifndef __LITTLE_ENDIAN
#define __LITTLE_ENDIAN -1
#endif
#define __BYTE_ORDER __LITTLE_ENDIAN

Annotation

Implementation Notes