hal_arch.h

开放源码实时操作系统源码.

#ifndef CYGONCE_HAL_HAL_ARCH_H
#define CYGONCE_HAL_HAL_ARCH_H
//==========================================================================
//
//      hal_arch.h
//
//      Architecture specific abstractions
//
//==========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
//
// eCos is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 or (at your option) any later version.
//
// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with eCos; if not, write to the Free Software Foundation, Inc.,
// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
//
// As a special exception, if other files instantiate templates or use macros
// or inline functions from this file, or you compile this file and link it
// with other works to produce a work based on this file, this file does not
// by itself cause the resulting work to be covered by the GNU General Public
// License. However the source code for this file must still be made available
// in accordance with section (3) of the GNU General Public License.
//
// This exception does not invalidate any other reasons why a work based on
// this file might be covered by the GNU General Public License.
//
// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
// at http://sources.redhat.com/ecos/ecos-license/
// -------------------------------------------
//####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):     nickg
// Contributors:  nickg, dmoseley
// Date:          1999-02-18
// Purpose:       Define architecture abstractions
// Usage:         #include <cyg/hal/hal_arch.h>
//              
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/hal.h>
#include <cyg/infra/cyg_type.h>

#include <cyg/hal/var_arch.h>

//--------------------------------------------------------------------------
// Exception handling function.
// This function is defined by the kernel according to this prototype. It is
// invoked from the HAL to deal with any CPU exceptions that the HAL does
// not want to deal with itself. It usually invokes the kernel's exception
// delivery mechanism.

externC void cyg_hal_deliver_exception( CYG_WORD code, CYG_ADDRWORD data );

//--------------------------------------------------------------------------
// Bit manipulation routines

externC cyg_uint32 hal_lsbit_index(cyg_uint32 mask);
externC cyg_uint32 hal_msbit_index(cyg_uint32 mask);

#define HAL_LSBIT_INDEX(index, mask) index = hal_lsbit_index(mask);

#define HAL_MSBIT_INDEX(index, mask) index = hal_msbit_index(mask);

//--------------------------------------------------------------------------
// Context Initialization
// Initialize the context of a thread.
// Arguments:
// _sp_ name of variable containing current sp, will be written with new sp
// _thread_ thread object address, passed as argument to entry point
// _entry_ entry point address.
// _id_ bit pattern used in initializing registers, for debugging.

#ifndef HAL_THREAD_INIT_CONTEXT_EXTRA
#define HAL_THREAD_INIT_CONTEXT_EXTRA(_regs_, _id_)
#endif

#define HAL_THREAD_INIT_CONTEXT( _sp_, _thread_, _entry_, _id_ )            \
{                                                                           \
    register HAL_SavedRegisters *_regs_;                                    \
    _regs_ = (HAL_SavedRegisters *)(((CYG_ADDRWORD)(_sp_)&~15) -            \
                                    sizeof(HAL_SavedRegisters)*2);          \
    HAL_THREAD_INIT_CONTEXT_EXTRA(_regs_, _id_);                            \
    _regs_->d0    = (CYG_WORD)(_thread_);                                   \
    _regs_->d1    = (_id_)|0xddd1;                                          \
    _regs_->d2    = (_id_)|0xddd2;                                          \
    _regs_->d3    = (_id_)|0xddd3;                                          \
    _regs_->a0    = (_id_)|0xaaa0;                                          \
    _regs_->a1    = (_id_)|0xaaa1;                                          \
    _regs_->a2    = (_id_)|0xaaa2;                                          \
    _regs_->a3    = (_id_)|0xaaa3;                                          \
    _regs_->mdr   = 0;                                                      \
    _regs_->lir   = 0;                                                      \
    _regs_->lar   = 0;                                                      \
    _regs_->psw   = 0x0000F00;                                              \
    _regs_->pc    = (CYG_WORD)(_entry_);                                    \
    _sp_          = (CYG_ADDRESS)_regs_;                                    \
}

//--------------------------------------------------------------------------
// Context switch macros.
// The arguments are pointers to locations where the stack pointer
// of the current thread is to be stored, and from where the sp of the
// next thread is to be fetched.

externC void hal_thread_switch_context( CYG_ADDRESS to, CYG_ADDRESS from );
externC void hal_thread_load_context( CYG_ADDRESS to )
    __attribute__ ((noreturn));

#define HAL_THREAD_SWITCH_CONTEXT(_fspptr_,_tspptr_)                    \
        hal_thread_switch_context((CYG_ADDRESS)_tspptr_,                \
                                  (CYG_ADDRESS)_fspptr_);

#define HAL_THREAD_LOAD_CONTEXT(_tspptr_)                               \
        hal_thread_load_context( (CYG_ADDRESS)_tspptr_ );

//--------------------------------------------------------------------------
// Execution reorder barrier.
// When optimizing the compiler can reorder code. In multithreaded systems
// where the order of actions is vital, this can sometimes cause problems.
// This macro may be inserted into places where reordering should not happen.

#define HAL_REORDER_BARRIER() asm volatile ( "" : : : "memory" )

//--------------------------------------------------------------------------
// Breakpoint support
// HAL_BREAKPOINT() is a code sequence that will cause a breakpoint to
// happen if executed.
// HAL_BREAKINST is the value of the breakpoint instruction and
// HAL_BREAKINST_SIZE is its size in bytes.
// HAL_BREAKINST_TYPE is the type.

#define HAL_BREAKPOINT(_label_)                 \
asm volatile (" .globl  _" #_label_ ";"         \
              "_"#_label_":"                    \
              ".byte 0xFF"                      \
    );

#define HAL_BREAKINST           0xFF

#define HAL_BREAKINST_SIZE      1

#define HAL_BREAKINST_TYPE      cyg_uint8

//--------------------------------------------------------------------------
// Thread register state manipulation for GDB support.

// Translate a stack pointer as saved by the thread context macros above into
// a pointer to a HAL_SavedRegisters structure.
#define HAL_THREAD_GET_SAVED_REGISTERS( _sp_, _regs_ )                     \
        (_regs_) = (HAL_SavedRegisters *)(_sp_)

#ifndef HAL_GET_GDB_EXTRA_REGISTERS
#define HAL_GET_GDB_EXTRA_REGISTERS( _regval_, _regs_ )
#endif
#ifndef HAL_SET_GDB_EXTRA_REGISTERS
#define HAL_SET_GDB_EXTRA_REGISTERS( _regs_, _regval_ )
#endif


// Copy a set of registers from a HAL_SavedRegisters structure into a
// GDB ordered array.    
//
// The CYGMON version should differ by also handling SP and PSW
// since we will be using a different stack.
#ifdef CYGPKG_CYGMON
#define HAL_GET_GDB_REGISTERS( _aregval_ , _regs_ )             \
{                                                               \
    CYG_ADDRWORD *_regval_ = (CYG_ADDRWORD *)(_aregval_);       \
                                                                \
    _regval_[0]         = (_regs_)->d0;                         \
    _regval_[1]         = (_regs_)->d1;                         \