arch/arm/nwfpe/softfloat.h

Source file repositories/reference/linux-study-clean/arch/arm/nwfpe/softfloat.h

File Facts

System
Linux kernel
Corpus path
arch/arm/nwfpe/softfloat.h
Extension
.h
Size
10002 bytes
Lines
282
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

===============================================================================

This C header file is part of the SoftFloat IEC/IEEE Floating-point
Arithmetic Package, Release 2.

Written by John R. Hauser.  This work was made possible in part by the
International Computer Science Institute, located at Suite 600, 1947 Center
Street, Berkeley, California 94704.  Funding was partially provided by the
National Science Foundation under grant MIP-9311980.  The original version
of this code was written as part of a project to build a fixed-point vector
processor in collaboration with the University of California at Berkeley,
overseen by Profs. Nelson Morgan and John Wawrzynek.  More information
is available through the Web page
http://www.jhauser.us/arithmetic/SoftFloat-2b/SoftFloat-source.txt

THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE.  Although reasonable effort
has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
TIMES RESULT IN INCORRECT BEHAVIOR.  USE OF THIS SOFTWARE IS RESTRICTED TO
PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.

Derivative works are acceptable, even for commercial purposes, so long as
(1) they include prominent notice that the work is derivative, and (2) they
include prominent notice akin to these three paragraphs for those parts of
this code that are retained.

===============================================================================
*/

#ifndef __SOFTFLOAT_H__
#define __SOFTFLOAT_H__


/*
-------------------------------------------------------------------------------
The macro `FLOATX80' must be defined to enable the extended double-precision
floating-point format `floatx80'.  If this macro is not defined, the
`floatx80' type will not be defined, and none of the functions that either
input or output the `floatx80' type will be defined.
-------------------------------------------------------------------------------
*/
#ifdef CONFIG_FPE_NWFPE_XP
#define FLOATX80
#endif

/*
-------------------------------------------------------------------------------
Software IEC/IEEE floating-point types.
-------------------------------------------------------------------------------
*/
typedef u32 float32;
typedef u64 float64;
typedef struct {
#ifdef __ARMEB__
    u16 __padding;
    u16 high;
#else
    u16 high;
    u16 __padding;
#endif
    u64 low;
}  __attribute__ ((packed,aligned(4))) floatx80;

/*
-------------------------------------------------------------------------------
Software IEC/IEEE floating-point underflow tininess-detection mode.
-------------------------------------------------------------------------------
*/
extern signed char float_detect_tininess;
enum {
    float_tininess_after_rounding  = 0,
    float_tininess_before_rounding = 1
};

/*
-------------------------------------------------------------------------------
Software IEC/IEEE floating-point rounding mode.
-------------------------------------------------------------------------------
*/
//extern int8 float_rounding_mode;
enum {
    float_round_nearest_even = 0,
    float_round_to_zero      = 1,
    float_round_down         = 2,
    float_round_up           = 3
};

/*
-------------------------------------------------------------------------------
Software IEC/IEEE floating-point exception flags.

Annotation

Implementation Notes