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Performance improvements.

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This commit is contained in:
Richard Barry 2008-05-04 20:04:52 +00:00
parent 0eae0f7549
commit 4304c07ebf
1 changed files with 16 additions and 12 deletions
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28
Source/portable/MPLAB/PIC32MX/ISR_Support.h
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@ -88,22 +88,26 @@
ins k1, k0, 10, 6
ins k1, zero, 1, 4
/* Load, incrmement, then save the interrupt nesting count. */
/* s5 is used as the frame pointer. */
add s5, zero, sp
/* Check the nesting count value. */
la k0, uxInterruptNesting
lw s6, (k0)
/* If the nesting count is 0 then swap to the the system stack, otherwise
the system stack is already being used. */
bne s6, zero, .+16
nop
/* Swap to the system stack. */
la sp, xISRStackTop
lw sp, (sp)
/* Increment and save the nesting count. */
addiu s6, s6, 1
sw s6, 0(k0)
/* If it was zero, switch to the system stack. If it was not zero then
we are already using the system stack. s5 holds the old stack value -
this might be used to determine the cause of a general exception. */
add s5, zero, sp
addiu s6, s6, -1
bne zero, s6, .+20
nop
la s6, xISRStackTop
lw sp, (s6)
/* s6 holds the EPC value, we may want this during the context switch. */
mfc0 s6, _CP0_EPC
@ -132,7 +136,7 @@
sw v0, 52(s5)
sw s7, 48(s5)
sw s6, portEPC_STACK_LOCATION(s5)
/* s5 has already been saved. */
/* s5 and s6 has already been saved. */
sw s4, 36(s5)
sw s3, 32(s5)
sw s2, 28(s5)