185 lines
7.8 KiB
C
185 lines
7.8 KiB
C
|
/*
|
||
|
|
* xtruntime.h -- general C definitions for single-threaded run-time
|
||
|
|
*
|
||
|
|
* Copyright (c) 2002-2008 Tensilica Inc.
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge, to any person obtaining
|
||
|
|
* a copy of this software and associated documentation files (the
|
||
|
|
* "Software"), to deal in the Software without restriction, including
|
||
|
|
* without limitation the rights to use, copy, modify, merge, publish,
|
||
|
|
* distribute, sublicense, and/or sell copies of the Software, and to
|
||
|
|
* permit persons to whom the Software is furnished to do so, subject to
|
||
|
|
* the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice shall be included
|
||
|
|
* in all copies or substantial portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
||
|
|
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
||
|
|
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
||
|
|
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
|
||
|
|
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef XTRUNTIME_H
|
||
|
|
#define XTRUNTIME_H
|
||
|
|
|
||
|
|
#include <xtensa/config/core.h>
|
||
|
|
#include <xtensa/config/specreg.h>
|
||
|
|
|
||
|
|
#ifndef XTSTR
|
||
|
|
#define _XTSTR(x) # x
|
||
|
|
#define XTSTR(x) _XTSTR(x)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define _xtos_set_execption_handler _xtos_set_exception_handler /* backward compatibility */
|
||
|
|
#define _xtos_set_saved_intenable _xtos_ints_on /* backward compatibility */
|
||
|
|
#define _xtos_clear_saved_intenable _xtos_ints_off /* backward compatibility */
|
||
|
|
|
||
|
|
#if !defined(_ASMLANGUAGE) && !defined(__ASSEMBLER__)
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*typedef void (_xtos_timerdelta_func)(int);*/
|
||
|
|
#ifdef __cplusplus
|
||
|
|
typedef void (_xtos_handler_func)(...);
|
||
|
|
#else
|
||
|
|
typedef void (_xtos_handler_func)();
|
||
|
|
#endif
|
||
|
|
typedef _xtos_handler_func *_xtos_handler;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* unsigned XTOS_SET_INTLEVEL(int intlevel);
|
||
|
|
* This macro sets the current interrupt level.
|
||
|
|
* The 'intlevel' parameter must be a constant.
|
||
|
|
* This macro returns a 32-bit value that must be passed to
|
||
|
|
* XTOS_RESTORE_INTLEVEL() to restore the previous interrupt level.
|
||
|
|
* XTOS_RESTORE_JUST_INTLEVEL() also does this, but in XEA2 configs
|
||
|
|
* it restores only PS.INTLEVEL rather than the entire PS register
|
||
|
|
* and thus is slower.
|
||
|
|
*/
|
||
|
|
#if !XCHAL_HAVE_INTERRUPTS
|
||
|
|
# define XTOS_SET_INTLEVEL(intlevel) 0
|
||
|
|
# define XTOS_SET_MIN_INTLEVEL(intlevel) 0
|
||
|
|
# define XTOS_RESTORE_INTLEVEL(restoreval)
|
||
|
|
# define XTOS_RESTORE_JUST_INTLEVEL(restoreval)
|
||
|
|
#elif XCHAL_HAVE_XEA2
|
||
|
|
/* In XEA2, we can simply safely set PS.INTLEVEL directly: */
|
||
|
|
/* NOTE: these asm macros don't modify memory, but they are marked
|
||
|
|
* as such to act as memory access barriers to the compiler because
|
||
|
|
* these macros are sometimes used to delineate critical sections;
|
||
|
|
* function calls are natural barriers (the compiler does not know
|
||
|
|
* whether a function modifies memory) unless declared to be inlined. */
|
||
|
|
# define XTOS_SET_INTLEVEL(intlevel) ({ unsigned __tmp; \
|
||
|
|
__asm__ __volatile__( "rsil %0, " XTSTR(intlevel) "\n" \
|
||
|
|
: "=a" (__tmp) : : "memory" ); \
|
||
|
|
__tmp;})
|
||
|
|
# define XTOS_SET_MIN_INTLEVEL(intlevel) ({ unsigned __tmp, __tmp2, __tmp3; \
|
||
|
|
__asm__ __volatile__( "rsr %0, " XTSTR(PS) "\n" /* get old (current) PS.INTLEVEL */ \
|
||
|
|
"movi %2, " XTSTR(intlevel) "\n" \
|
||
|
|
"extui %1, %0, 0, 4\n" /* keep only INTLEVEL bits of parameter */ \
|
||
|
|
"blt %2, %1, 1f\n" \
|
||
|
|
"rsil %0, " XTSTR(intlevel) "\n" \
|
||
|
|
"1:\n" \
|
||
|
|
: "=a" (__tmp), "=&a" (__tmp2), "=&a" (__tmp3) : : "memory" ); \
|
||
|
|
__tmp;})
|
||
|
|
# define XTOS_RESTORE_INTLEVEL(restoreval) do{ unsigned __tmp = (restoreval); \
|
||
|
|
__asm__ __volatile__( "wsr %0, " XTSTR(PS) " ; rsync\n" \
|
||
|
|
: : "a" (__tmp) : "memory" ); \
|
||
|
|
}while(0)
|
||
|
|
# define XTOS_RESTORE_JUST_INTLEVEL(restoreval) _xtos_set_intlevel(restoreval)
|
||
|
|
#else
|
||
|
|
/* In XEA1, we have to rely on INTENABLE register virtualization: */
|
||
|
|
extern unsigned _xtos_set_vpri( unsigned vpri );
|
||
|
|
extern unsigned _xtos_vpri_enabled; /* current virtual priority */
|
||
|
|
# define XTOS_SET_INTLEVEL(intlevel) _xtos_set_vpri(~XCHAL_INTLEVEL_ANDBELOW_MASK(intlevel))
|
||
|
|
# define XTOS_SET_MIN_INTLEVEL(intlevel) _xtos_set_vpri(_xtos_vpri_enabled & ~XCHAL_INTLEVEL_ANDBELOW_MASK(intlevel))
|
||
|
|
# define XTOS_RESTORE_INTLEVEL(restoreval) _xtos_set_vpri(restoreval)
|
||
|
|
# define XTOS_RESTORE_JUST_INTLEVEL(restoreval) _xtos_set_vpri(restoreval)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The following macros build upon the above. They are generally used
|
||
|
|
* instead of invoking the SET_INTLEVEL and SET_MIN_INTLEVEL macros directly.
|
||
|
|
* They all return a value that can be used with XTOS_RESTORE_INTLEVEL()
|
||
|
|
* or _xtos_restore_intlevel() or _xtos_restore_just_intlevel() to restore
|
||
|
|
* the effective interrupt level to what it was before the macro was invoked.
|
||
|
|
* In XEA2, the DISABLE macros are much faster than the MASK macros
|
||
|
|
* (in all configs, DISABLE sets the effective interrupt level, whereas MASK
|
||
|
|
* makes ensures the effective interrupt level is at least the level given
|
||
|
|
* without lowering it; in XEA2 with INTENABLE virtualization, these macros
|
||
|
|
* affect PS.INTLEVEL only, not the virtual priority, so DISABLE has partial
|
||
|
|
* MASK semantics).
|
||
|
|
*
|
||
|
|
* A typical critical section sequence might be:
|
||
|
|
* unsigned rval = XTOS_DISABLE_EXCM_INTERRUPTS;
|
||
|
|
* ... critical section ...
|
||
|
|
* XTOS_RESTORE_INTLEVEL(rval);
|
||
|
|
*/
|
||
|
|
/* Enable all interrupts (those activated with _xtos_ints_on()): */
|
||
|
|
#define XTOS_ENABLE_INTERRUPTS XTOS_SET_INTLEVEL(0)
|
||
|
|
/* Disable low priority level interrupts (they can interact with the OS): */
|
||
|
|
#define XTOS_DISABLE_LOWPRI_INTERRUPTS XTOS_SET_INTLEVEL(XCHAL_NUM_LOWPRI_LEVELS)
|
||
|
|
#define XTOS_MASK_LOWPRI_INTERRUPTS XTOS_SET_MIN_INTLEVEL(XCHAL_NUM_LOWPRI_LEVELS)
|
||
|
|
/* Disable interrupts that can interact with the OS: */
|
||
|
|
#define XTOS_DISABLE_EXCM_INTERRUPTS XTOS_SET_INTLEVEL(XCHAL_EXCM_LEVEL)
|
||
|
|
#define XTOS_MASK_EXCM_INTERRUPTS XTOS_SET_MIN_INTLEVEL(XCHAL_EXCM_LEVEL)
|
||
|
|
#if 0 /* XTOS_LOCK_LEVEL is not exported to applications */
|
||
|
|
/* Disable interrupts that can interact with the OS, or manipulate virtual INTENABLE: */
|
||
|
|
#define XTOS_DISABLE_LOCK_INTERRUPTS XTOS_SET_INTLEVEL(XTOS_LOCK_LEVEL)
|
||
|
|
#define XTOS_MASK_LOCK_INTERRUPTS XTOS_SET_MIN_INTLEVEL(XTOS_LOCK_LEVEL)
|
||
|
|
#endif
|
||
|
|
/* Disable ALL interrupts (not for common use, particularly if one's processor
|
||
|
|
* configuration has high-level interrupts and one cares about their latency): */
|
||
|
|
#define XTOS_DISABLE_ALL_INTERRUPTS XTOS_SET_INTLEVEL(15)
|
||
|
|
|
||
|
|
|
||
|
|
extern unsigned int _xtos_ints_off( unsigned int mask );
|
||
|
|
extern unsigned int _xtos_ints_on( unsigned int mask );
|
||
|
|
extern unsigned _xtos_set_intlevel( int intlevel );
|
||
|
|
extern unsigned _xtos_set_min_intlevel( int intlevel );
|
||
|
|
extern unsigned _xtos_restore_intlevel( unsigned restoreval );
|
||
|
|
extern unsigned _xtos_restore_just_intlevel( unsigned restoreval );
|
||
|
|
extern _xtos_handler _xtos_set_interrupt_handler( int n, _xtos_handler f );
|
||
|
|
extern _xtos_handler _xtos_set_interrupt_handler_arg( int n, _xtos_handler f, void *arg );
|
||
|
|
extern _xtos_handler _xtos_set_exception_handler( int n, _xtos_handler f );
|
||
|
|
|
||
|
|
extern void _xtos_memep_initrams( void );
|
||
|
|
extern void _xtos_memep_enable( int flags );
|
||
|
|
|
||
|
|
/* Deprecated (but kept because they were documented): */
|
||
|
|
extern unsigned int _xtos_read_ints( void ); /* use xthal_get_interrupt() instead */
|
||
|
|
extern void _xtos_clear_ints( unsigned int mask ); /* use xthal_set_intclear() instead */
|
||
|
|
|
||
|
|
#if XCHAL_NUM_CONTEXTS > 1
|
||
|
|
extern unsigned _xtos_init_context(int context_num, int stack_size,
|
||
|
|
_xtos_handler_func *start_func, int arg1);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Deprecated: */
|
||
|
|
#if XCHAL_NUM_TIMERS > 0
|
||
|
|
extern void _xtos_timer_0_delta( int cycles );
|
||
|
|
#endif
|
||
|
|
#if XCHAL_NUM_TIMERS > 1
|
||
|
|
extern void _xtos_timer_1_delta( int cycles );
|
||
|
|
#endif
|
||
|
|
#if XCHAL_NUM_TIMERS > 2
|
||
|
|
extern void _xtos_timer_2_delta( int cycles );
|
||
|
|
#endif
|
||
|
|
#if XCHAL_NUM_TIMERS > 3
|
||
|
|
extern void _xtos_timer_3_delta( int cycles );
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif /* !_ASMLANGUAGE && !__ASSEMBLER__ */
|
||
|
|
|
||
|
|
#endif /* XTRUNTIME_H */
|
||
|
|
|