diff options
Diffstat (limited to 'c/src/exec/score/cpu/sparc/cpu_asm.s')
| -rw-r--r-- | c/src/exec/score/cpu/sparc/cpu_asm.s | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/c/src/exec/score/cpu/sparc/cpu_asm.s b/c/src/exec/score/cpu/sparc/cpu_asm.s index d9af28e19e..2376ea53bf 100644 --- a/c/src/exec/score/cpu/sparc/cpu_asm.s +++ b/c/src/exec/score/cpu/sparc/cpu_asm.s @@ -489,7 +489,24 @@ dont_switch_stacks: sub %sp, CPU_MINIMUM_STACK_FRAME_SIZE, %sp - wr %l0, SPARC_PSR_ET_MASK, %psr ! **** ENABLE TRAPS **** + /* + * Check if we have an external interrupt (trap 0x11 - 0x1f). If so, + * set the PIL in the %psr to mask off interrupts with lower priority. + * The original %psr in %l0 is not modified since it will be restored + * when the interrupt handler returns. + */ + + mov %l0, %g5 + subcc %l3, 0x11, %g0 + bl dont_fix_pil + subcc %l3, 0x1f, %g0 + bg dont_fix_pil + sll %l3, 8, %g4 + and %g4, SPARC_PSR_PIL_MASK, %g4 + andn %l0, SPARC_PSR_PIL_MASK, %g5 + or %g4, %g5, %g5 +dont_fix_pil: + wr %g5, SPARC_PSR_ET_MASK, %psr ! **** ENABLE TRAPS **** /* * Vector to user's handler. |