xtensa_interrupts: Add _xt_disable_interrupts/_xt_restore_interrupts inline functions
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2 changed files with 45 additions and 16 deletions
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@ -73,7 +73,6 @@ extern "C" {
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#include "esp8266.h"
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#include "espressif/esp8266/ets_sys.h"
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#include <stdint.h>
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#include <xtruntime.h>
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#include "xtensa_rtos.h"
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#include "xtensa_interrupts.h"
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@ -144,33 +143,31 @@ extern char sdk_NMIIrqIsOn;
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extern char level1_int_disabled;
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extern unsigned cpu_sr;
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/* ESPTODO: Currently we store the old interrupt level (ps) in a
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global variable cpu_sr. It may not be necessary to do this,
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especially as lx106 has only one real interrupt level + NMI, but it
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all depends on how the blob libraries call into these functions.
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/* Disable interrupts, store old ps level in global variable cpu_sr.
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Note: cpu_sr is also referenced by the binary SDK.
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Where possible (and when writing non-FreeRTOS specific code),
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prefer to _xt_disable_interrupts & _xt_enable_interrupts and store
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the ps value in a local variable - that approach is recursive-safe
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and generally better.
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*/
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inline static __attribute__((always_inline)) void _esp_disable_interrupts(void)
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inline static __attribute__((always_inline)) void portDISABLE_INTERRUPTS(void)
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{
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if(!sdk_NMIIrqIsOn && !level1_int_disabled) {
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__asm__ volatile ("rsil %0, " XTSTR(XCHAL_EXCM_LEVEL) : "=a" (cpu_sr) :: "memory");
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cpu_sr = _xt_disable_interrupts();
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level1_int_disabled = 1;
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}
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}
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inline static __attribute__((always_inline)) void _esp_enable_interrupts(void)
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inline static __attribute__((always_inline)) void portENABLE_INTERRUPTS(void)
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{
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if(!sdk_NMIIrqIsOn && level1_int_disabled) {
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level1_int_disabled = 0;
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__asm__ volatile ("wsr %0, ps" :: "a" (cpu_sr) : "memory");
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_xt_restore_interrupts(cpu_sr);
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}
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}
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/* Disable interrupts, saving previous state in cpu_sr */
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#define portDISABLE_INTERRUPTS() _esp_disable_interrupts()
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/* Restore interrupts to previous level saved in cpu_sr */
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#define portENABLE_INTERRUPTS() _esp_enable_interrupts()
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/* Critical section management. */
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void vPortEnterCritical( void );
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void vPortExitCritical( void );
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@ -10,13 +10,45 @@
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#ifndef _XTENSA_INTERRUPTS_H
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#define _XTENSA_INTERRUPTS_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <xtruntime.h>
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#include <xtensa/hal.h>
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#include <common_macros.h>
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void sdk__xt_int_exit (void);
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void sdk__xt_user_exit (void);
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void sdk__xt_tick_timer_init (void);
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void sdk__xt_timer_int1(void);
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INLINED uint32_t _xt_get_intlevel(void)
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{
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uint32_t level;
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__asm__ volatile("rsr %0, intlevel" : "=a"(level));
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return level;
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}
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/* Disable interrupts and return the old ps value, to pass into
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_xt_restore_interrupts later.
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This is desirable to use in place of
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portDISABLE_INTERRUPTS/portENABLE_INTERRUPTS for
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non-FreeRTOS & non-portable code.
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*/
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INLINED uint32_t _xt_disable_interrupts(void)
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{
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uint32_t old_level;
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__asm__ volatile ("rsil %0, " XTSTR(XCHAL_EXCM_LEVEL) : "=a" (old_level));
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return old_level;
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}
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/* Restore PS level. Intended to be used with _xt_disable_interrupts */
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INLINED void _xt_restore_interrupts(uint32_t new_ps)
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{
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__asm__ volatile ("wsr %0, ps; rsync" :: "a" (new_ps));
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}
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/* ESPTODO: the mask/unmask functions aren't thread safe */
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INLINED void _xt_isr_unmask(uint32_t unmask)
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{
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uint32_t intenable;
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