diff options
Diffstat (limited to 'cpukit/score/cpu/sparc/sparc-counter-asm.S')
| -rw-r--r-- | cpukit/score/cpu/sparc/sparc-counter-asm.S | 105 |
1 files changed, 102 insertions, 3 deletions
diff --git a/cpukit/score/cpu/sparc/sparc-counter-asm.S b/cpukit/score/cpu/sparc/sparc-counter-asm.S index 8ed079f48b..6f3e61c12b 100644 --- a/cpukit/score/cpu/sparc/sparc-counter-asm.S +++ b/cpukit/score/cpu/sparc/sparc-counter-asm.S @@ -1,5 +1,5 @@ /* - * Copyright (c) 2016 embedded brains GmbH. All rights reserved. + * Copyright (c) 2016, 2018 embedded brains GmbH. All rights reserved. * * embedded brains GmbH * Dornierstr. 4 @@ -18,17 +18,116 @@ #include <rtems/asm.h> + /* + * All functions except _SPARC_Counter_read_clock() in this module are + * sometimes called with traps disabled. + */ + .section ".text" .align 4 - PUBLIC(_SPARC_Counter_read_address) -SYM(_SPARC_Counter_read_address): + PUBLIC(_SPARC_Counter_read_default) +SYM(_SPARC_Counter_read_default): + sethi %hi(_SPARC_Counter + 12), %o1 + ld [%o1 + %lo(_SPARC_Counter + 12)], %o0 + add %o0, 1, %o0 + jmp %o7 + 8 + st %o0, [%o1 + %lo(_SPARC_Counter + 12)] + + PUBLIC(_SPARC_Counter_read_up) + PUBLIC(_SPARC_Get_timecount_up) +SYM(_SPARC_Counter_read_up): +SYM(_SPARC_Get_timecount_up): sethi %hi(_SPARC_Counter + 8), %o0 ld [%o0 + %lo(_SPARC_Counter + 8)], %o0 jmp %o7 + 8 ld [%o0], %o0 + PUBLIC(_SPARC_Counter_read_down) + PUBLIC(_SPARC_Get_timecount_down) +SYM(_SPARC_Counter_read_down): +SYM(_SPARC_Get_timecount_down): + sethi %hi(_SPARC_Counter + 8), %o0 + ld [%o0 + %lo(_SPARC_Counter + 8)], %o0 + ld [%o0], %o0 + jmp %o7 + 8 + xnor %g0, %o0, %o0 + + /* + * For the corresponding C code is something like this: + * + * CPU_Counter_ticks _SPARC_Counter_read_clock_isr_disabled( void ) + * { + * const SPARC_Counter *ctr; + * CPU_Counter_ticks ticks; + * CPU_Counter_ticks accumulated; + * + * ctr = &_SPARC_Counter; + * ticks = *ctr->counter_register; + * accumulated = ctr->accumulated; + * + * if ( ( *ctr->pending_register & ctr->pending_mask ) != 0 ) { + * ticks = *ctr->counter_register; + * accumulated += ctr->interval; + * } + * + * return accumulated - ticks; + * } + */ + PUBLIC(_SPARC_Counter_read_clock_isr_disabled) +SYM(_SPARC_Counter_read_clock_isr_disabled): + sethi %hi(_SPARC_Counter), %o5 + or %o5, %lo(_SPARC_Counter), %o5 + ld [%o5 + 8], %o3 + ld [%o5 + 12], %o4 + ld [%o5 + 16], %o2 + ld [%o3], %o0 + ld [%o4], %o1 + btst %o1, %o2 + bne .Lpending_isr_disabled + ld [%o5 + 20], %o4 + jmp %o7 + 8 + sub %o4, %o0, %o0 +.Lpending_isr_disabled: + ld [%o5 + 24], %o5 + ld [%o3], %o0 + add %o4, %o5, %o4 + jmp %o7 + 8 + sub %o4, %o0, %o0 + + /* + * For the corresponding C code see + * _SPARC_Counter_read_clock_isr_disabled() above. + */ + PUBLIC(_SPARC_Counter_read_clock) + PUBLIC(_SPARC_Get_timecount_clock) +SYM(_SPARC_Counter_read_clock): +SYM(_SPARC_Get_timecount_clock): + sethi %hi(_SPARC_Counter), %o5 + or %o5, %lo(_SPARC_Counter), %o5 + ta SPARC_SWTRAP_IRQDIS + ld [%o5 + 8], %o3 + ld [%o5 + 12], %o4 + ld [%o5 + 16], %o2 + ld [%o3], %o0 + ld [%o4], %o1 + btst %o1, %o2 + bne .Lpending + ld [%o5 + 20], %o4 + ta SPARC_SWTRAP_IRQEN + jmp %o7 + 8 + sub %o4, %o0, %o0 +.Lpending: + ld [%o5 + 24], %o5 + ld [%o3], %o0 + ta SPARC_SWTRAP_IRQEN + add %o4, %o5, %o4 + jmp %o7 + 8 + sub %o4, %o0, %o0 + PUBLIC(_SPARC_Counter_read_asr23) + PUBLIC(_SPARC_Get_timecount_asr23) SYM(_SPARC_Counter_read_asr23): +SYM(_SPARC_Get_timecount_asr23): jmp %o7 + 8 mov %asr23, %o0 |