__OSGlobalIntMask

    lw      $t0, __OSGlobalIntMask	__OSGlobalIntMask
    xor     $t2, $t0, ~0		~__OSGlobalIntMask
    and     $t2, SR_IMASK		(~__OSGlobalIntMask) & SR_IMASK
    or      $t4, $t1, $t2		(thread->sr & SR_IMASK) | ((~__OSGlobalIntMask) & SR_IMASK)
				      = (thread->sr | (~__OSGlobalIntMask)) & SR_IMASK
    and     $t3, $k1, ~SR_IMASK		thread->sr & ~SR_IMASK
    and     $t0, SR_IMASK		__OSGlobalIntMask & SR_IMASK
    or      $t3, $t4			(thread->sr & ~SR_IMASK) | (thread->sr & SR_IMASK) | ((~__OSGlobalIntMask) & SR_IMASK)
				      = (thread->sr & ~SR_IMASK) | (thread->sr | (~__OSGlobalIntMask)) & SR_IMASK)
    and     $t1, $t0			(thread->sr & SR_IMASK) & (__OSGlobalIntMask & SR_IMASK)
				      = thread->sr & __OSGlobalIntMask & SR_IMASK
    and     $k1, ~SR_IMASK		thread->sr & ~SR_IMASK
    sw      $t3, THREAD_SR($k0)
    or      $k1, $t1			(thread->sr & ~SR_IMASK) | (thread->sr & __OSGlobalIntMask & SR_IMASK)

	(thread->sr & ~SR_IMASK) | (thread->sr | (~__OSGlobalIntMask)) & SR_IMASK)
		Leave bits outside of SR_IMASK alone, ???

	(thread->sr & ~SR_IMASK) | (thread->sr & __OSGlobalIntMask & SR_IMASK)
		Leave bits outside of SR_IMASK alone, while masking bits inside of SR_IMASK with __OSGlobalIntMask



    lw      $t1, PHYS_TO_K1(MI_INTR_MASK_REG)	MI_INTR_MASK_REG
    beqz    $t1, endrcp
     nop
    lw      $t0, __OSGlobalIntMask		__OSGlobalIntMask
    lw      $t4, THREAD_RCP($k0)		thread->rcp
    srl     $t0, RCP_IMASKSHIFT			__OSGlobalIntMask >> RCP_IMASKSHIFT
    xor     $t0, ~0				~(__OSGlobalIntMask >> RCP_IMASKSHIFT)
					      = (~__OSGlobalIntMask) >> RCP_IMASKSHIFT
    and     $t0, (RCP_IMASK >> RCP_IMASKSHIFT)	~(__OSGlobalIntMask >> RCP_IMASKSHIFT) & (RCP_IMASK >> RCP_IMASKSHIFT)
					      = ((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT
    and     $t0, $t4				(((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT) & thread->rcp
    or      $t1, $t0				MI_INTR_MASK_REG | ((((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT) & thread->rcp)
endrcp:

	MI_INTR_MASK_REG | ((((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT) & thread->rcp)
		Value in MI_INTR_MASK_REG, and values in thread->rcp that are not set in the RCP bits of __OSGlobalIntMask



    lw      $k1, THREAD_SR($a1)		thread->sr
    and     $t1, $k1, SR_IMASK		thread->sr & SR_IMASK
    beqz    $t1, 2f
     nop
    lw      $t0, __OSGlobalIntMask	__OSGlobalIntMask
    xor     $t0, ~0			~__OSGlobalIntMask
    and     $t0, SR_IMASK		(~__OSGlobalIntMask) & SR_IMASK
    or      $t1, $t0			(thread->sr & SR_IMASK) | ((~__OSGlobalIntMask) & SR_IMASK)
				      = (thread->sr | (~__OSGlobalIntMask)) & SR_IMASK
    and     $k1, ~SR_IMASK		thread->sr & ~SR_IMASK
    or      $k1, $t1			(thread->sr & ~SR_IMASK) | ((thread->sr | (~__OSGlobalIntMask)) & SR_IMASK)
    sw      $k1, THREAD_SR($a1)
2:

	(thread->sr & ~SR_IMASK) | ((thread->sr | (~__OSGlobalIntMask)) & SR_IMASK)
		Leave bits outside of SR_IMASK alone, ???



    lw      $k1, PHYS_TO_K1(MI_INTR_MASK_REG)	MI_INTR_MASK_REG
    beqz    $k1, 3f
     nop
    lw      $k0, __OSGlobalIntMask		__OSGlobalIntMask
    lw      $t0, THREAD_RCP($a1)		thread->rcp
    srl     $k0, RCP_IMASKSHIFT			__OSGlobalIntMask >> RCP_IMASKSHIFT
    xor     $k0, ~0				~(__OSGlobalIntMask >> RCP_IMASKSHIFT)
					      = (~__OSGlobalIntMask) >> RCP_IMASKSHIFT
    and     $k0, (RCP_IMASK >> RCP_IMASKSHIFT)	((~__OSGlobalIntMask) >> RCP_IMASKSHIFT) & (RCP_IMASK >> RCP_IMASKSHIFT)
					      = ((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT
    and     $k0, $t0				(((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT) & thread->rcp
    or      $k1, $k0				MI_INTR_MASK_REG | ((((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT) & thread->rcp)

	MI_INTR_MASK_REG | ((((~__OSGlobalIntMask) & RCP_IMASK) >> RCP_IMASKSHIFT) & thread->rcp)
		Value in MI_INTR_MASK_REG, and values in thread->rcp that are not set in the RCP bits of __OSGlobalIntMask



    move    $k0, $v0
    lw      $k1, THREAD_SR($k0)		thread->sr
    lw      $t0, __OSGlobalIntMask	__OSGlobalIntMask
    and     $t1, $k1, SR_IMASK		thread->sr & SR_IMASK
    and     $t0, SR_IMASK		__OSGlobalIntMask & SR_IMASK
    and     $t1, $t0			(thread->sr & SR_IMASK) & (__OSGlobalIntMask & SR_IMASK)
    and     $k1, ~SR_IMASK		thread->sr & ~SR_IMASK
    or      $k1, $t1			(thread->sr & ~SR_IMASK) & (thread->sr & SR_IMASK) & (__OSGlobalIntMask & SR_IMASK)
				      = (thread->sr & ~SR_IMASK) & (thread->sr & __OSGlobalIntMask & SR_IMASK)
    mtc0    $k1, C0_SR

	(thread->sr & ~SR_IMASK) & (thread->sr & __OSGlobalIntMask & SR_IMASK)
		Leave bits outside of SR_IMASK alone, mask values inside SR_IMASK with the global int mask



    lw      $k1, THREAD_RCP($k0)		thread->rcp
    lw      $k0, __OSGlobalIntMask		__OSGlobalIntMask
    srl     $k0, RCP_IMASKSHIFT			__OSGlobalIntMask >> RCP_IMASKSHIFT
    and     $k1, $k0				thread->rcp & (__OSGlobalIntMask >> RCP_IMASKSHIFT)
    sll     $k1, 1
    la      $k0, __osRcpImTable
    addu    $k1, $k1, $k0
    lhu     $k1, ($k1)				__osRcpImTable[thread->rcp & (__OSGlobalIntMask >> RCP_IMASKSHIFT)]
    la      $k0, PHYS_TO_K1(MI_INTR_MASK_REG)	MI_INTR_MASK_REG
    sw      $k1, ($k0)

	thread->rcp & (__OSGlobalIntMask >> RCP_IMASKSHIFT)
		Mask values with the RCP bits of the global int mask