121 lines
4.4 KiB
C
121 lines
4.4 KiB
C
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// Copyright (c) 2003-2015 Cadence Design Systems, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef __XOS_INTERNAL_H__
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#define __XOS_INTERNAL_H__
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#if !defined(__XOS_H__) || !defined(_XOS_INCLUDE_INTERNAL_)
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#error "xos_internal.h must be included by defining _XOS_INCLUDE_INTERNAL_ before including xos.h"
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#endif
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#include <xtensa/config/core.h>
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#include "xos_common.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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// Use this macro to suppress compiler warnings for unused variables.
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#define UNUSED(x) (void)(x)
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#if XOS_DEBUG
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#include <stdio.h>
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#include <xtensa/xtutil.h>
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# define DPRINTF printf
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#else
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# define DPRINTF(x...) do {} while(0)
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#endif
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//-----------------------------------------------------------------------------
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// Internal flags for thread creation.
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//-----------------------------------------------------------------------------
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#define XOS_THREAD_FAKE 0x8000 // Don't allocate stack (init and idle threads).
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//-----------------------------------------------------------------------------
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// Interrupt handler table entry. This structure defines one entry in the XOS
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// interrupt handler table.
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//-----------------------------------------------------------------------------
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typedef struct XosIntEntry {
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XosIntFunc * handler; // Pointer to handler function.
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void * arg; // Argument passed to handler function.
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#if XOS_OPT_INTERRUPT_SWPRI
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unsigned char level; // Interrupt level.
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unsigned char priority; // Interrupt priority.
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short reserved; // Reserved.
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unsigned int primask; // Mask of interrupts at higher priority.
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#else
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unsigned int ps; // Value of PS when running the handler.
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#endif
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} XosIntEntry;
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//-----------------------------------------------------------------------------
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// Extern variables.
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//-----------------------------------------------------------------------------
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extern unsigned xos_intlevel_mask;
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extern unsigned xos_intenable_mask;
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extern XosIntEntry xos_interrupt_table[XCHAL_NUM_INTERRUPTS];
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extern uint32_t xos_clock_freq;
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extern uint32_t xos_tick_period;
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extern uint64_t xos_system_ticks;
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extern uint64_t xos_system_cycles;
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extern uint32_t xos_num_ctx_switches;
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/*
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One thing I noticed is different between my initial idea of stack
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assignments to RTC threads, when comparing to interrupts, is that I
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expected each RTC thread priority to have its own stack, whereas
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interrupts of different priorities share an interrupt stack.
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It's not really a difference in memory usage, because when assigning
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multiple priorities to a stack, you have to add-up worst-case for
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all priorities. One possible functional difference is that with
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separate stacks per priority, it's possible to dynamically change
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the priority of an RTC thread (while it's running). Not sure how
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valuable that might be -- changing priority is useful with priority
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inheritance, to avoid priority inversion, but I don't know how often
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an RTC thread might acquire a lock (it couldn't block on acquiring a
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lock in the usual sense -- it could get queued waiting and be restarted
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when it becomes available, or use try_lock instead of lock).
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*/
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#ifdef __cplusplus
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}
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#endif
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#endif /* __XOS_INTERNAL_H__ */
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