363 lines
16 KiB
C
363 lines
16 KiB
C
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// xos_common.h - Macros and definitions common to C and assembly code.
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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_COMMON_H__
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#define __XOS_COMMON_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <xtensa/corebits.h>
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#include <xtensa/config/system.h>
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#include <xtensa/config/tie.h>
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#include "xos_params.h"
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//-----------------------------------------------------------------------------
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// Macros that help define structures for both C and assembler.
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// These are somewhat different from the XTOS version in xtruntime-frames.h.
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//-----------------------------------------------------------------------------
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#if defined(_ASMLANGUAGE) || defined(__ASSEMBLER__)
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#define STRUCT_BEGIN .pushsection .text; .struct 0
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#define STRUCT_FIELD(ctype,size,asname,name) asname: .space size
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#define STRUCT_AFIELD(ctype,size,asname,name,n) asname: .space (size)*(n)
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#define STRUCT_END(sname) sname##Size:; .popsection
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#else
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#define STRUCT_BEGIN typedef struct {
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#define STRUCT_FIELD(ctype,size,asname,name) ctype name;
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#define STRUCT_AFIELD(ctype,size,asname,name,n) ctype name[n];
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#define STRUCT_END(sname) } sname;
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#endif //_ASMLANGUAGE || __ASSEMBLER__
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//-----------------------------------------------------------------------------
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// Offsets relative to xos_globals.
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//-----------------------------------------------------------------------------
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#define XOS_INTLEVEL_MASK 0 // offset to the level mask
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#define XOS_INTENABLE_MASK 4 // offset to the enable mask
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#define XOS_CURR_THREADPTR 8 // offset to the current thread ptr
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#define XOS_NEXT_THREADPTR 12 // offset to the next thread ptr
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#define XOS_INTERRUPT_TABLE 16 // offset to the interrupt table
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//-----------------------------------------------------------------------------
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// Offsets for xos_interrupt_table[] entries.
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//-----------------------------------------------------------------------------
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#define XOS_INTTAB_HANDLER (XOS_INTERRUPT_TABLE+0) // ofs to interrupt handler
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#define XOS_INTTAB_ARG (XOS_INTERRUPT_TABLE+4) // ofs to interrupt handler arg
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#define XOS_INTTAB_PS (XOS_INTERRUPT_TABLE+8) // (hwpri) PS for interrupt level
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#define XOS_INTTAB_LEVEL (XOS_INTERRUPT_TABLE+8) // (swpri) interrupt level (1..7)
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#define XOS_INTTAB_PRI (XOS_INTERRUPT_TABLE+9) // (swpri) interrupt priority (0..255)
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#define XOS_INTTAB_PRIMASK (XOS_INTERRUPT_TABLE+12) // (swpri) mask of higher pri. interrupts
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//-----------------------------------------------------------------------------
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// Exception/interrupt stack frame layout for a pre-empted thread
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// tcb->resume_fn == &xos_resume_preempted_thread).
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// Pointed to by thread->esf. Located just below thread's current stack ptr.
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// Thread's a1 == thread->esf + XosExcFrameSize.
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// NOTE: exception frame size is a multiple of 16.
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//-----------------------------------------------------------------------------
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STRUCT_BEGIN
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STRUCT_AFIELD(long,4,FRAME_AREG,areg, 12) // a4-a15 (offsets 0 thru 44)
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// (a1 is computed, a0,a2-a3 are in s32e range of a1)
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//#if XCHAL_HAVE_LOOPS
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STRUCT_FIELD (long,4,FRAME_LBEG,lbeg)
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STRUCT_FIELD (long,4,FRAME_LEND,lend)
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STRUCT_FIELD (long,4,FRAME_LCOUNT,lcount)
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//#endif
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//#if XCHAL_HAVE_MAC16
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STRUCT_FIELD (long,4,FRAME_ACCLO,acclo)
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STRUCT_FIELD (char,1,FRAME_ACCHI,acchi)
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//#endif
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STRUCT_FIELD (char,1,FRAME_SAR,sar)
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STRUCT_FIELD (short,2,FRAME_PAD0,pad0) // unused
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STRUCT_FIELD (long,4,FRAME_EXCCAUSE,exccause)
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STRUCT_FIELD (long,4,FRAME_EXCVADDR,excvaddr)
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STRUCT_FIELD (long,4,FRAME_PAD1,pad1) // unused -- pad to make multiple of 16 bytes
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STRUCT_FIELD (long,4,FRAME_PAD2,pad2)
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STRUCT_FIELD (long,4,FRAME_PS,ps) // (XOS_FRAME_SIZE-44) in S32E range of end
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STRUCT_FIELD (long,4,FRAME_PC,pc) // (XOS_FRAME_SIZE-40) in S32E range of end
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STRUCT_FIELD (long,4,FRAME_A0,a0)
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STRUCT_FIELD (long,4,FRAME_A2,a2) // (XOS_FRAME_SIZE-32) in S32E range of end
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STRUCT_FIELD (long,4,FRAME_A3,a3) // (XOS_FRAME_SIZE-28) in S32E range of end
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STRUCT_FIELD (long,4,FRAME_LEVELMASK,levelmask) //
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STRUCT_FIELD (long,4,FRAME_NESTCHAIN,nestchain) // nested C function call chain ptr
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// Caller's a0-a3 save area below SP. These fields MUST be the last ones in the
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// struct so that they are guaranteed to be just under the original SP (before
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// we allocate the exception frame).
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STRUCT_AFIELD (long,4,FRAME_CWINSAVE,cwinsave, 4) // (XOS_FRAME_SIZE-16)
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STRUCT_END(XosExcFrame) // NOTE: exception frame size is 128
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#define FRAME_AR(x) (FRAME_AREG + x*4 - 16)
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#if defined(_ASMLANGUAGE) || defined(__ASSEMBLER__)
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#define XOS_FRAME_SIZE XosExcFrameSize
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#else
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#define XOS_FRAME_SIZE sizeof(XosExcFrame)
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#endif
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//-----------------------------------------------------------------------------
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// Stack frame layout for a cooperatively switched out thread
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// (tcb->resume_fn == &xos_resume_cooperative_thread).
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// Pointed to by thread->esf. This is a function frame.
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// Thread's a1 == thread->esf.
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//-----------------------------------------------------------------------------
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STRUCT_BEGIN
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STRUCT_FIELD (long,4,CFRAME_A0,a0) // return PC
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STRUCT_FIELD (long,4,CFRAME_LEVELMASK,levelmask)
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STRUCT_FIELD (long,4,CFRAME_PS,ps)
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#ifdef __XTENSA_CALL0_ABI__
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STRUCT_FIELD (long,4,CFRAME_PAD0,pad0)
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STRUCT_AFIELD(long,4,CFRAME_AREG,areg,4) // callee-saved regs a12-a15
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#endif
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STRUCT_END(XosCoopFrame)
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//-----------------------------------------------------------------------------
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// Offsets into thread control block (must match xos_thread.h !!)
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//-----------------------------------------------------------------------------
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#define TCB_RESUME_FN 12 // ptr to thread resume asm sequence
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#define TCB_STACK_ESF 16 // saved stack ptr (actually, ptr to ESF)
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#define TCB_TIE_SAVE 20 // ptr to TIE save area
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#define TCB_RETVALUE 24 // ptr to xos_block return value
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#define TCB_STACK_END 36 // ptr to end of stack (thread's initial stack ptr)
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#define TCB_STARTUP_ENTRY 40 // ptr to thread entry function
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#define TCB_STARTUP_ARG 44 // ptr to thread entry function's arg
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#define TCB_READY 48 // thread ready state (1 byte)
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#define TCB_CLIB_PTR 108 // thread C lib context pointer
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#define TCB_RESUME_CCOUNT 116 // cycle count at last resume
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#define TCB_CYCLE_COUNT 120 // number of cycles consumed
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#define TCB_NORMAL_RESUMES 128 // number of cooperative/restart thread resumes
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#define TCB_PREEMPT_RESUMES 132 // number of pre-emptive thread resumes
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//-----------------------------------------------------------------------------
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// Coprocessor state handling:
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// The coprocessor state save area is allocated on the thread stack. The stack
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// must be sized appropriately. Threads that do not use coprocessors need not
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// allocate the storage area.
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//
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// Along with the save area for each coprocessor, two bitmasks with flags per
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// coprocessor (laid out as in the CPENABLE reg) help manage context switching
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// coprocessors as efficiently as possible:
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//
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// XT_CPENABLE
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// The contents of a non-running thread's CPENABLE register.
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// It represents the coprocessors owned (and whose state is still needed)
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// by the thread. When a thread is preempted, its CPENABLE is saved here.
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// When a thread solicits a context switch, its CPENABLE is cleared - the
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// compiler has saved the (caller-saved) coprocessor state if needed.
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// When a non-running thread loses ownership of a CP, its bit is cleared.
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// When a thread runs, it's XT_CPENABLE is loaded into the CPENABLE reg.
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// Avoids coprocessor exceptions when no change of ownership is needed.
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//
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// XT_CPSTORED
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// A bitmask with the same layout as CPENABLE, a bit per coprocessor.
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// Indicates whether the state of each coprocessor is saved in the state
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// save area. When a thread enters the kernel, only the state of coprocs
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// still enabled in CPENABLE is saved. When the coprocessor exception
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// handler assigns ownership of a coprocessor to a thread, it restores
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// the saved state only if this bit is set, and clears this bit.
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//
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// XT_CP_CS_ST
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// A bitmask with the same layout as CPENABLE, a bit per co-processor.
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// Indicates whether callee-saved state is saved in the state save area.
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// Callee-saved state is saved by itself on a solicited context switch,
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// and restored when needed by the coprocessor exception handler.
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// Unsolicited switches will cause the entire coprocessor to be saved
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// when necessary.
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//
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// XT_NCP_ASA
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// Pointer to aligned save area for non-CP state. This is always filled
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// in, even if there is no non-CP state to be saved. If there is no state
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// to be saved then no space is actually allocated and this pointer is
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// not used.
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//
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// XT_CP_ASA
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// Pointer to aligned save area for coprocessor state. This is filled in
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// only if coprocessor state is to be saved for the thread. Allows it to be
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// aligned more than the overall save area (which might be stack-aligned
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// or TCB-aligned). Especially relevant for Xtensa cores configured with a
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// very large data path that requires alignment greater than 16 bytes (ABI
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// stack alignment).
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//-----------------------------------------------------------------------------
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#define ALIGNUP(n, val) (((val) + (n)-1) & -(n))
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// Offsets of each coprocessor save area within the 'aligned save area'.
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// The non-CP TIE state save area is at offset 0, so that it does not
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// move around if some or all coprocessors are not to be saved.
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#define XT_NCP_SA 0
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#define XT_CP0_SA ALIGNUP(XCHAL_CP0_SA_ALIGN, XT_NCP_SA + XCHAL_NCP_SA_SIZE)
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#define XT_CP1_SA ALIGNUP(XCHAL_CP1_SA_ALIGN, XT_CP0_SA + XCHAL_CP0_SA_SIZE)
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#define XT_CP2_SA ALIGNUP(XCHAL_CP2_SA_ALIGN, XT_CP1_SA + XCHAL_CP1_SA_SIZE)
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#define XT_CP3_SA ALIGNUP(XCHAL_CP3_SA_ALIGN, XT_CP2_SA + XCHAL_CP2_SA_SIZE)
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#define XT_CP4_SA ALIGNUP(XCHAL_CP4_SA_ALIGN, XT_CP3_SA + XCHAL_CP3_SA_SIZE)
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#define XT_CP5_SA ALIGNUP(XCHAL_CP5_SA_ALIGN, XT_CP4_SA + XCHAL_CP4_SA_SIZE)
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#define XT_CP6_SA ALIGNUP(XCHAL_CP6_SA_ALIGN, XT_CP5_SA + XCHAL_CP5_SA_SIZE)
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#define XT_CP7_SA ALIGNUP(XCHAL_CP7_SA_ALIGN, XT_CP6_SA + XCHAL_CP6_SA_SIZE)
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#define XT_TOT_SA_SIZE ALIGNUP(16, XT_CP7_SA + XCHAL_CP7_SA_SIZE)
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#define XT_NCP_SA_SIZE XCHAL_NCP_SA_SIZE
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// Offsets within the overall save area
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#define XT_CPENABLE 0 // (2 bytes) coprocessors active for this thread
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#define XT_CPSTORED 2 // (2 bytes) coprocessors saved for this thread
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#define XT_CP_CS_ST 4 // (2 bytes) coprocessor callee-saved regs for this thread
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#define XT_NCP_ASA 8 // (4 bytes) ptr to aligned save area for nonCP state
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#define XT_CP_ASA 12 // (4 bytes) ptr to aligned save area for CP state
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// Overall size allows for dynamic alignment, make sure multiple of 4 bytes.
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// XT_CP_SIZE - total space needed for all coprocessors + nonCP state + hdr
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// XT_NCP_SIZE - total space needed for nonCP state + hdr
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#define XT_CP_SIZE ALIGNUP(4, (16 + XT_TOT_SA_SIZE + XCHAL_TOTAL_SA_ALIGN))
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#define XT_NCP_SIZE ALIGNUP(4, (16 + XT_NCP_SA_SIZE + XCHAL_TOTAL_SA_ALIGN))
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//-----------------------------------------------------------------------------
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// Stack size computation.
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//
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// XOS_STACK_MIN_SIZE
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// The minimum recommended stack size for any XOS thread. If you want to
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// use a stack size smaller than this, you will have to verify that the
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// smaller size will work under all operating conditions.
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//
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// XOS_STACK_MIN_SIZE_NO_CP
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// The minimum recommended atack size for threads that will not use any
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// coprocessor resources. No coprocessor state will be saved/restored
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// for these threads. Non-CP TIE state will still be saved/restored.
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// These threads must be created with the flag XOS_THREAD_NO_CP.
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//
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// XOS_STACK_EXTRA
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// The amount of stack space used by the system to:
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// - save coprocessor state
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// - save non-coprocessor TIE state
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// - allocate an interrupt/exception frame
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//
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// XOS_STACK_EXTRA_NO_CP
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// The amount of stack space used by the system to:
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// - save non-coprocessor TIE state
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// - allocate an interrupt/exception frame
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//-----------------------------------------------------------------------------
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#define XOS_STACK_EXTRA (XOS_FRAME_SIZE + XT_CP_SIZE)
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#define XOS_STACK_EXTRA_NO_CP (XOS_FRAME_SIZE + XT_NCP_SIZE)
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#ifdef __XTENSA_CALL0_ABI__
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#define XOS_STACK_MIN_SIZE (XOS_STACK_EXTRA + 0x180)
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#define XOS_STACK_MIN_SIZE_NO_CP (XOS_STACK_EXTRA_NO_CP + 0x180)
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#else
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#define XOS_STACK_MIN_SIZE (XOS_STACK_EXTRA + 0x200)
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#define XOS_STACK_MIN_SIZE_NO_CP (XOS_STACK_EXTRA_NO_CP + 0x200)
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#endif
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//-----------------------------------------------------------------------------
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// Items related to C library thread safety.
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//-----------------------------------------------------------------------------
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#if XOS_OPT_THREAD_SAFE_CLIB
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#if XSHAL_CLIB == XTHAL_CLIB_XCLIB
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#if !defined(_ASMLANGUAGE) && !defined(__ASSEMBLER__)
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#include <sys/reent.h>
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#endif
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#define CLIB_THREAD_STRUCT struct _reent xclib_reent
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#define GLOBAL_CLIB_PTR _reent_ptr
|
||
|
|
#elif XSHAL_CLIB == XTHAL_CLIB_NEWLIB
|
||
|
|
#if !defined(_ASMLANGUAGE) && !defined(__ASSEMBLER__)
|
||
|
|
#include <sys/reent.h>
|
||
|
|
#endif
|
||
|
|
#define CLIB_THREAD_STRUCT struct _reent newlib_reent
|
||
|
|
#define GLOBAL_CLIB_PTR _impure_ptr
|
||
|
|
#else
|
||
|
|
#error The selected C runtime library is not thread safe.
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // XOS_OPT_THREAD_SAFE_CLIB
|
||
|
|
|
||
|
|
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
// Check (MAX_OS_INTLEVEL,EXCM_LEVEL)
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
#if XOS_MAX_OS_INTLEVEL >= XCHAL_EXCM_LEVEL
|
||
|
|
# define XOS_MAX_OSEXCM_LEVEL XOS_MAX_OS_INTLEVEL
|
||
|
|
#else
|
||
|
|
# warning "XOS_MAX_OS_INTLEVEL was set below XCHAL_EXCM_LEVEL: this was never tested"
|
||
|
|
# define XOS_MAX_OSEXCM_LEVEL XCHAL_EXCM_LEVEL
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
// Detect if in interrupt context.
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
#if XCHAL_HAVE_INTERRUPTS
|
||
|
|
#define INTERRUPT_CONTEXT ((XT_RSR_PS() & PS_UM) == 0)
|
||
|
|
#else
|
||
|
|
#define INTERRUPT_CONTEXT 0
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
// Xtensa tools version.
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
#if defined __XCC__
|
||
|
|
#define XTTOOLS_VERSION (__XCC__ + __XCC_MINOR__)
|
||
|
|
#else
|
||
|
|
#define XTTOOLS_VERSION (0)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
// Erratum workarounds.
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
|
||
|
|
// Erratum 487 fix is available in version RF.3 onwards and RG.2 onwards.
|
||
|
|
#if ((__XCC__ == 11000) && (__XCC_MINOR__ >= 3)) || (XTTOOLS_VERSION >= 12002)
|
||
|
|
#define HWERR_487_FIX hw_erratum_487_fix
|
||
|
|
#else
|
||
|
|
#define HWERR_487_FIX
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif // __XOS_COMMON_H__
|
||
|
|
|