hal_arch.h

eCos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):   proven
// Contributors:proven, pjo, nickg
// Date:        1998-10-05
// 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>

//-----------------------------------------------------------------------------
// Processor saved states. This structure is also defined in i386.inc for
// assembly code. Do not change this without changing that (or vice versa).

#ifdef CYGHWR_HAL_I386_FPU

typedef struct
{
    cyg_uint32  fpstate_valid;
    cyg_uint32  fpstate[108/sizeof(cyg_uint32)];
#ifdef CYGHWR_HAL_I386_PENTIUM_SSE
    cyg_uint32  xmm0[4];
    cyg_uint32  xmm1[4];
    cyg_uint32  xmm2[4];
    cyg_uint32  xmm3[4];
    cyg_uint32  xmm4[4];
    cyg_uint32  xmm5[4];
    cyg_uint32  xmm6[4];
    cyg_uint32  xmm7[4];
    cyg_uint32  mxcsr;
#endif
} HAL_FPU_Context;

#endif

typedef struct 
{
#ifdef CYGHWR_HAL_I386_FPU
#ifdef CYGHWR_HAL_I386_FPU_SWITCH_LAZY
    HAL_FPU_Context     *fpucontext;
#else
    HAL_FPU_Context     fpucontext;    
#endif    
#endif    
    cyg_uint32  edi;
    cyg_uint32  esi;
    cyg_uint32  ebp;
    cyg_uint32  esp;
    cyg_uint32  ebx;
    cyg_uint32  edx;
    cyg_uint32  ecx;
    cyg_uint32  eax;    
    cyg_uint32  vector; // if saved on interrupt contains intr vector
    cyg_uint32  pc;
    cyg_uint32  cs;
    cyg_uint32  eflags;
} HAL_SavedRegisters;


//-----------------------------------------------------------------------------
// 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

#define HAL_LSBIT_INDEX(index, mask)            \
CYG_MACRO_START                                 \
    asm volatile( "bsfl %1,%0\n"                \
                  : "=r" (index)                \
                  : "r" (mask)                  \
                );                              \
CYG_MACRO_END

#define HAL_MSBIT_INDEX(index, mask)            \
CYG_MACRO_START                                 \
    asm volatile( "bsrl %1,%0\n"                \
                  : "=r" (index)                \
                  : "r" (mask)                  \
                );                              \
CYG_MACRO_END

//-----------------------------------------------------------------------------
// 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 CYG_HAL_DEFAULT_CS
#define CYG_HAL_DEFAULT_CS 0x0008
#endif

#ifdef CYGHWR_HAL_I386_FPU
# ifdef CYGHWR_HAL_I386_FPU_SWITCH_LAZY
# define HAL_THREAD_INIT_FPU_CONTEXT_SPACE( __sp, __fpspace )   \
         __sp -= sizeof(HAL_FPU_Context);                       \
         __fpspace = __sp;
# define HAL_THREAD_INIT_FPU_CONTEXT( __regs, __fpspace )                               \
CYG_MACRO_START                                                                         \
    cyg_ucount8 __i;                                                                    \
    HAL_FPU_Context *__fpspace_ = (HAL_FPU_Context *)(__fpspace);                       \
    (__regs)->fpucontext = __fpspace_;                                                  \
    __fpspace_->fpstate_valid = 0;                                                      \
    for( __i = 0; __i < (sizeof(__fpspace_->fpstate)/sizeof(cyg_uint32)); __i++ )       \
        __fpspace_->fpstate[__i] = 0;                                                   \
CYG_MACRO_END
# else
# define HAL_THREAD_INIT_FPU_CONTEXT_SPACE( __sp, __fpspace )                   \
         (__fpspace) = (__fpspace);
# define HAL_THREAD_INIT_FPU_CONTEXT( __regs, __fpspace )                               \
CYG_MACRO_START                                                                         \
    cyg_ucount8 __i;                                                                    \
    HAL_FPU_Context *__fpspace_ = &((__regs)->fpucontext);                              \
    __fpspace_->fpstate_valid = 0;                                                      \
    for( __i = 0; __i < (sizeof(__fpspace_->fpstate)/sizeof(cyg_uint32)); __i++ )       \
        __fpspace_->fpstate[__i] = 0;                                                   \
CYG_MACRO_END
# endif
#else
# define HAL_THREAD_INIT_FPU_CONTEXT_SPACE( __sp, __fpspace )                   \
         (__fpspace) = (__fpspace);
# define HAL_THREAD_INIT_FPU_CONTEXT( __regs, __fpspace )
#endif


#define HAL_THREAD_INIT_CONTEXT( _sparg_, _thread_, _entry_, _id_ )     \
CYG_MACRO_START                                                         \
    register CYG_WORD* _sp_ = ((CYG_WORD*)((_sparg_) &~15));            \
    register CYG_WORD *_fpspace_ = NULL;                                \
    register HAL_SavedRegisters *_regs_;                                \
                                                                        \
    HAL_THREAD_INIT_FPU_CONTEXT_SPACE( _sp_, _fpspace_ );               \
    *(--_sp_) = (CYG_WORD)(0);                                          \
    *(--_sp_) = (CYG_WORD)(0);                                          \
    *(--_sp_) = (CYG_WORD)(_thread_);                                   \
    *(--_sp_) = (CYG_WORD)(0);                                          \
                                                                        \
    _regs_ = (HAL_SavedRegisters *)                                     \
               ((unsigned long)_sp_ - sizeof(HAL_SavedRegisters));      \