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Ensure that the configMAX_SYSCALL_INTERRUPT_PRIORITY setting works with all possible values.

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This commit is contained in:
Richard Barry 2011-04-05 09:45:42 +00:00
parent 9133ceb44d
commit 8fc0c27ea5
3 changed files with 39 additions and 24 deletions
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8
Source/portable/MPLAB/PIC32MX/port.c
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@ -204,7 +204,13 @@ unsigned portBASE_TYPE uxSavedStatusRegister;
asm volatile ( "di" );
uxSavedStatusRegister = _CP0_GET_STATUS() | 0x01;
_CP0_SET_STATUS( ( uxSavedStatusRegister | ( configMAX_SYSCALL_INTERRUPT_PRIORITY << portIPL_SHIFT ) ) );
/* This clears the IPL bits, then sets them to
configMAX_SYSCALL_INTERRUPT_PRIORITY. This function should not be called
from an interrupt that has a priority above
configMAX_SYSCALL_INTERRUPT_PRIORITY so, when used correctly, the action
can only result in the IPL being unchanged or raised, and therefore never
lowered. */
_CP0_SET_STATUS( ( ( uxSavedStatusRegister & ( ~portALL_IPL_BITS ) ) ) | ( configMAX_SYSCALL_INTERRUPT_PRIORITY << portIPL_SHIFT ) );
return uxSavedStatusRegister;
}