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| author | Joel Sherrill <joel.sherrill@OARcorp.com> | 1996-08-15 21:09:02 +0000 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 1996-08-15 21:09:02 +0000 |
| commit | cd3868cdd35255d57a08c4dd6e8a7b8545a08538 (patch) | |
| tree | 943b1ed5ffacd8b53701df82a59c681c195ee490 /c/src/exec/score | |
| parent | _Thread_Start_multitasking: added code to initialize the floating point (diff) | |
| download | rtems-cd3868cdd35255d57a08c4dd6e8a7b8545a08538.tar.bz2 | |
updates from Tony Bennett (tbennett@divnc.com)
Diffstat (limited to 'c/src/exec/score')
| -rw-r--r-- | c/src/exec/score/cpu/hppa1.1/cpu.c | 6 | ||||
| -rw-r--r-- | c/src/exec/score/cpu/hppa1.1/hppa.h | 22 |
2 files changed, 26 insertions, 2 deletions
diff --git a/c/src/exec/score/cpu/hppa1.1/cpu.c b/c/src/exec/score/cpu/hppa1.1/cpu.c index 89bb8a8447..d72dda4941 100644 --- a/c/src/exec/score/cpu/hppa1.1/cpu.c +++ b/c/src/exec/score/cpu/hppa1.1/cpu.c @@ -126,15 +126,17 @@ void _CPU_Initialize( proc_ptr old_handler; /* - * XXX; need to setup fpsr smarter perhaps + * This is the default fp context for all tasks + * Set it up so that denormalized results go to zero. */ fp_context = (unsigned8*) &_CPU_Null_fp_context; for (i=0 ; i<sizeof(Context_Control_fp); i++) *fp_context++ = 0; + *((unsigned32 *) &_CPU_Null_fp_context) = HPPA_FPSTATUS_D; /* - * Set _CPU_Default_gr27 here so it will hopefully be the correct + * Save r27 into _CPU_Default_gr27 so it will hopefully be the correct * global data pointer for the entire system. */ diff --git a/c/src/exec/score/cpu/hppa1.1/hppa.h b/c/src/exec/score/cpu/hppa1.1/hppa.h index ae1bd700de..87ba027aab 100644 --- a/c/src/exec/score/cpu/hppa1.1/hppa.h +++ b/c/src/exec/score/cpu/hppa1.1/hppa.h @@ -249,6 +249,28 @@ extern "C" { #define HPPA_PROT_X2 0x06c00000 /* Execute Only, Promote to Level 2 */ #define HPPA_PROT_X3 0x07c00000 /* Execute Only, Promote to Level 3 */ +/* + * Floating point status register definitions + */ + +#define HPPA_FPSTATUS_ENABLE_I 0x00000001 /* inexact operation */ +#define HPPA_FPSTATUS_ENABLE_U 0x00000002 /* underflow */ +#define HPPA_FPSTATUS_ENABLE_O 0x00000004 /* overflow */ +#define HPPA_FPSTATUS_ENABLE_Z 0x00000008 /* division by zero */ +#define HPPA_FPSTATUS_ENABLE_V 0x00000010 /* invalid operation */ +#define HPPA_FPSTATUS_D 0x00000020 /* denormalize as zero */ +#define HPPA_FPSTATUS_T 0x00000040 /* delayed trap */ +#define HPPA_FPSTATUS_RM_MASK 0x00000600 /* rounding mode */ +#define HPPA_FPSTATUS_RM_SHIFT 9 +#define HPPA_FPSTATUS_CQ_MASK 0x001FFC00 /* compare queue */ +#define HPPA_FPSTATUS_CQ_SHIFT 13 +#define HPPA_FPSTATUS_C 0x04000000 /* most recent ompare bit */ +#define HPPA_FPSTATUS_FLAG_I 0x08000000 /* inexact */ +#define HPPA_FPSTATUS_FLAG_U 0x10000000 /* underflow */ +#define HPPA_FPSTATUS_FLAG_O 0x20000000 /* overflow */ +#define HPPA_FPSTATUS_FLAG_Z 0x40000000 /* division by zero */ +#define HPPA_FPSTATUS_FLAG_V 0x80000000 /* invalid operation */ + /* * Inline macros for misc. interesting opcodes |