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AVR32: Move address environment switch from the task switchers to the interrupt handler. That may save doing the action multiple times per interrupt

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This commit is contained in:
Gregory Nutt 2014-08-28 07:06:19 -06:00
parent 0659a478bb
commit eac58d5849
3 changed files with 43 additions and 38 deletions
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14
arch/hc/src/common/up_blocktask.c
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@ -137,19 +137,11 @@ void up_block_task(struct tcb_s *tcb, tstate_t task_state)
rtcb = (struct tcb_s*)g_readytorun.head;
/* Then switch contexts */
/* Then switch contexts. Any necessary address environment
* changes will be made when the interrupt returns.
*/
up_restorestate(rtcb->xcp.regs);
#ifdef CONFIG_ARCH_ADDRENV
/* Make sure that the address environment for the previously
* running task is closed down gracefully (data caches dump,
* MMU flushed) and set up the address environment for the new
* thread at the head of the ready-to-run list.
*/
(void)group_addrenv(rtcb);
#endif
}
/* Copy the user C context into the TCB at the (old) head of the

53
arch/hc/src/common/up_doirq.c
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@ -1,7 +1,7 @@
/****************************************************************************
* arch/hc/src/common/up_doirq.c
*
* Copyright (C) 2011 Gregory Nutt. All rights reserved.
* Copyright (C) 2011, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -49,6 +49,8 @@
#include "up_arch.h"
#include "up_internal.h"
#include "group/group.h"
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
@ -75,27 +77,47 @@ uint8_t *up_doirq(int irq, uint8_t *regs)
#ifdef CONFIG_SUPPRESS_INTERRUPTS
PANIC();
#else
uint8_t *savestate;
/* Nested interrupts are not supported in this implementation. If you want
* to implement nested interrupts, you would have to (1) change the way that
* current_regs is handled and (2) the design associated with
* CONFIG_ARCH_INTERRUPTSTACK. The savestate variable will not work for
* that purpose as implemented here because only the outermost nested
* interrupt can result in a context switch (it can probably be deleted).
*/
/* Current regs non-zero indicates that we are processing an interrupt;
* current_regs is also used to manage interrupt level context switches.
*
* Nested interrupts are not supported
*/
savestate = (uint8_t*)current_regs;
DEBUGASSERT(current_regs == NULL);
current_regs = regs;
/* Deliver the IRQ */
irq_dispatch(irq, regs);
#if defined(CONFIG_ARCH_FPU) || defined(CONFIG_ARCH_ADDRENV)
/* Check for a context switch. If a context switch occurred, then
* current_regs will have a different value than it did on entry. If an
* interrupt level context switch has occurred, then restore the floating
* point state and the establish the correct address environment before
* returning from the interrupt.
*/
if (regs != current_regs)
{
#ifdef CONFIG_ARCH_FPU
/* Restore floating point registers */
up_restorefpu((uint32_t*)current_regs);
#endif
#ifdef CONFIG_ARCH_ADDRENV
/* Make sure that the address environment for the previously
* running task is closed down gracefully (data caches dump,
* MMU flushed) and set up the address environment for the new
* thread at the head of the ready-to-run list.
*/
(void)group_addrenv(rtcb);
#endif
}
#endif
/* If a context switch occurred while processing the interrupt then
* current_regs may have change value. If we return any value different
* from the input regs, then the lower level will know that a context
@ -104,12 +126,11 @@ uint8_t *up_doirq(int irq, uint8_t *regs)
regs = (uint8_t*)current_regs;
/* Restore the previous value of current_regs. NULL would indicate that
* we are no longer in an interrupt handler. It will be non-NULL if we
* are returning from a nested interrupt.
/* Set current_regs to NULL to indicate that we are no longer in an
* interrupt handler.
*/
current_regs = savestate;
current_regs = NULL;
#endif
board_led_off(LED_INIRQ);
return regs;

14
arch/hc/src/common/up_unblocktask.c
View File

@ -127,19 +127,11 @@ void up_unblock_task(struct tcb_s *tcb)
rtcb = (struct tcb_s*)g_readytorun.head;
/* Then switch contexts */
/* Then switch contexts. Any necessary address environment
* changes will be made when the interrupt returns.
*/
up_restorestate(rtcb->xcp.regs);
#ifdef CONFIG_ARCH_ADDRENV
/* Make sure that the address environment for the previously
* running task is closed down gracefully (data caches dump,
* MMU flushed) and set up the address environment for the new
* thread at the head of the ready-to-run list.
*/
(void)group_addrenv(rtcb);
#endif
}
/* We are not in an interrupt handler. Copy the user C context