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Improve efficiency even further. Introduce the configMAX_SYSCALL_INTERRUPT_PRIORITY feature.

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This commit is contained in:
Richard Barry 2008-07-25 02:34:31 +00:00
parent 32592e1385
commit 794b6546b2
3 changed files with 39 additions and 42 deletions
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36
Source/portable/IAR/ARM_CM3/portasm.s
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@ -37,13 +37,13 @@
Please ensure to read the configuration and relevant port sections of the
online documentation.
http://www.FreeRTOS.org - Documentation, latest information, license and
http://www.FreeRTOS.org - Documentation, latest information, license and
contact details.
http://www.SafeRTOS.com - A version that is certified for use in safety
http://www.SafeRTOS.com - A version that is certified for use in safety
critical systems.
http://www.OpenRTOS.com - Commercial support, development, porting,
http://www.OpenRTOS.com - Commercial support, development, porting,
licensing and training services.
*/
@ -68,7 +68,6 @@ FreeRTOS.org versions prior to V4.3.0 did not include this definition. */
thumb
EXTERN vPortYieldFromISR
EXTERN uxCriticalNesting
EXTERN pxCurrentTCB
EXTERN vTaskSwitchContext
@ -93,36 +92,29 @@ xPortPendSVHandler:
ldr r3, =pxCurrentTCB /* Get the location of the current TCB. */
ldr r2, [r3]
ldr r1, =uxCriticalNesting /* Save the remaining registers and the critical nesting count onto the task stack. */
ldr r1, [r1]
stmdb r0!, {r1,r4-r11}
stmdb r0!, {r4-r11} /* Save the remaining registers. */
str r0, [r2] /* Save the new top of stack into the first member of the TCB. */
stmdb sp!, {r3, r14}
stmdb sp!, {r3, r14}
mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
msr basepri, r0
bl vTaskSwitchContext
ldmia sp!, {r3, r14}
mov r0, #0
msr basepri, r0
ldmia sp!, {r3, r14}
ldr r1, [r3]
ldr r2, =uxCriticalNesting
ldr r0, [r1] /* The first item in pxCurrentTCB is the task top of stack. */
ldmia r0!, {r1, r4-r11} /* Pop the registers and the critical nesting count. */
str r1, [r2] /* Save the new critical nesting value into ulCriticalNesting. */
ldmia r0!, {r4-r11} /* Pop the registers. */
msr psp, r0
orr r14, r14, #13
cbnz r1, sv_disable_interrupts /* If the nesting count is greater than 0 we need to exit with interrupts masked. */
bx r14
sv_disable_interrupts:
mov r1, #configKERNEL_INTERRUPT_PRIORITY
msr basepri, r1
bx r14
/*-----------------------------------------------------------*/
vPortSetInterruptMask:
push { r0 }
mov R0, #configKERNEL_INTERRUPT_PRIORITY
mov R0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
msr BASEPRI, R0
pop { R0 }
@ -144,9 +136,7 @@ vPortSVCHandler;
ldr r3, =pxCurrentTCB
ldr r1, [r3]
ldr r0, [r1]
ldmia r0!, {r1, r4-r11}
ldr r2, =uxCriticalNesting
str r1, [r2]
ldmia r0!, {r4-r11}
msr psp, r0
mov r0, #0
msr basepri, r0