/*
* See header file for description.
*/
portSTACK_TYPE * ICACHE_FLASH_ATTR
pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
{
#define SET_STKREG(r,v) sp[(r) >> 2] = (portSTACK_TYPE)(v)
portSTACK_TYPE *sp, *tp;
/* Create interrupt stack frame aligned to 16 byte boundary */
sp = (portSTACK_TYPE*) (((INT32U)(pxTopOfStack+1) - XT_CP_SIZE - XT_STK_FRMSZ) & ~0xf);
/* Clear the entire frame (do not use memset() because we don't depend on C library) */
for (tp = sp; tp <= pxTopOfStack; ++tp)
*tp = 0;
/* Explicitly initialize certain saved registers */
SET_STKREG( XT_STK_PC, pxCode ); /* task entrypoint */
SET_STKREG( XT_STK_A0, 0 ); /* to terminate GDB backtrace */
SET_STKREG( XT_STK_A1, (INT32U)sp + XT_STK_FRMSZ ); /* physical top of stack frame */
SET_STKREG( XT_STK_A2, pvParameters ); /* parameters */
SET_STKREG( XT_STK_EXIT, _xt_user_exit ); /* user exception exit dispatcher */
/* Set initial PS to int level 0, EXCM disabled ('rfe' will enable), user mode. */
#ifdef __XTENSA_CALL0_ABI__
SET_STKREG( XT_STK_PS, PS_UM | PS_EXCM );
#else
/* + for windowed ABI also set WOE and CALLINC (pretend task was 'call4'd). */
SET_STKREG( XT_STK_PS, PS_UM | PS_EXCM | PS_WOE | PS_CALLINC(1) );
#endif
return sp;
}
/*
* Stack initialization
*/
portSTACK_TYPE *pxPortInitialiseStack( portSTACK_TYPE *pxTopOfStack, pdTASK_CODE pxCode, void *pvParameters )
{
#define SET_STKREG(r,v) sp[(r) >> 2] = (portSTACK_TYPE)(v)
portSTACK_TYPE *sp, *tp;
/* Create interrupt stack frame aligned to 16 byte boundary */
sp = (portSTACK_TYPE*) (((uint32_t)(pxTopOfStack+1) - XT_CP_SIZE - XT_STK_FRMSZ) & ~0xf);
/* Clear the entire frame (do not use memset() because we don't depend on C library) */
for (tp = sp; tp <= pxTopOfStack; ++tp)
*tp = 0;
/* Explicitly initialize certain saved registers */
SET_STKREG( XT_STK_PC, pxCode ); /* task entrypoint */
SET_STKREG( XT_STK_A0, 0 ); /* to terminate GDB backtrace */
SET_STKREG( XT_STK_A1, (uint32_t)sp + XT_STK_FRMSZ ); /* physical top of stack frame */
SET_STKREG( XT_STK_A2, pvParameters ); /* parameters */
SET_STKREG( XT_STK_EXIT, sdk__xt_user_exit ); /* user exception exit dispatcher */
/* Set initial PS to int level 0, EXCM disabled ('rfe' will enable), user mode. */
SET_STKREG( XT_STK_PS, PS_UM | PS_EXCM );
return sp;
}
