hal_arch.h

eCos1.31版

#ifndef CYGONCE_HAL_ARCH_H
#define CYGONCE_HAL_ARCH_H

//==========================================================================
//
//      hal_arch.h
//
//      Architecture specific abstractions
//
//==========================================================================
//####COPYRIGHTBEGIN####
//                                                                          
// -------------------------------------------                              
// The contents of this file are subject to the Red Hat eCos Public License 
// Version 1.1 (the "License"); you may not use this file except in         
// compliance with the License.  You may obtain a copy of the License at    
// http://www.redhat.com/                                                   
//                                                                          
// Software distributed under the License is distributed on an "AS IS"      
// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
// License for the specific language governing rights and limitations under 
// the License.                                                             
//                                                                          
// The Original Code is eCos - Embedded Configurable Operating System,      
// released September 30, 1998.                                             
//                                                                          
// The Initial Developer of the Original Code is Red Hat.                   
// Portions created by Red Hat are                                          
// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
// All Rights Reserved.                                                     
// -------------------------------------------                              
//                                                                          
//####COPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    nickg, gthomas, hmt
// Contributors: nickg, gthomas, hmt
// Date:         1999-02-20
// Purpose:      Define architecture abstractions
// Usage:        #include <cyg/hal/hal_arch.h>
// 
//####DESCRIPTIONEND####
//
//==========================================================================

#include <pkgconf/hal.h>
#include <pkgconf/hal_sparclite.h>

#include <cyg/infra/cyg_type.h>

#include <cyg/hal/hal_intr.h>           // HAL_DISABLE_INTERRUPTS

//--------------------------------------------------------------------------
// Processor saved states:
//
// All these structures must be doubleword (64 bit) aligned.
// The code that creates them on the stack will ensure this is so.

#define HAL_THREAD_CONTEXT_GLOBAL_BASE 0
#define HAL_THREAD_CONTEXT_OUT_BASE    8
#define HAL_THREAD_CONTEXT_LOCAL_BASE 16
#define HAL_THREAD_CONTEXT_IN_BASE    24

typedef struct 
{
    // this is the save structure found at *(stack_ptr) always, note that
    // i[6] is the frame pointer is the previous stack pointer, and
    // o[6] is the stack pointer is the next frame pointer,
    // so they form a linked list back up the call stack.
    cyg_uint32  l[8];                                   /* Locals r16-r23 */
    cyg_uint32  i[8];                                   /* Ins    r24-r31 */
} HAL_SavedWindow;

typedef struct 
{
    // Window save at stack pointer
    HAL_SavedWindow li;
//16
    // This is the rest of the save state:
    //   NOTE: g[0] is used for the CWP, for %g0 == 0.  Also note that the
    //   assembler routines must load/store it in the right order.
    cyg_uint32  g[8] ;                                  /* Globals r0- r7 */
    cyg_uint32  o[8] ;                                  /* Outs    r8-r15 */
//32 words in size

// There is no need to save any other state; for example, condition codes,
// the PC and NextPC, and Y, are preserved in local registers in the trap
// handling window and so preserved in the caller stack frame as viewed
// from an ISR.  Note that the VSR is jumped to with those locals being set
// up (and Y in situ), and it must preserve them itself before calling any
// subsequent handlers (ISRs).

} HAL_SavedRegisters;


typedef struct 
{
    // Window save at stack pointer
    HAL_SavedWindow li;
    cyg_uint32      composite_return_ptr;          /* structure returns */
    cyg_uint32      spill_args[6];                 /* for callee to store */
    cyg_uint32      spare;                         /* keep this 64-bits   */
} HAL_FrameStructure;


//--------------------------------------------------------------------------
// 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 macros

#define HAL_LSBIT_INDEX(index, mask)            \
    CYG_MACRO_START                             \
    asm volatile (                              \
        "scan   %1, 0, %%l7;"                   \
        "mov    31, %0;"                        \
        "sub    %0, %%l7, %0"                   \
        : "=r"(index)                           \
        : "r"(mask & ~(mask-1))                 \
        : "l7"                                  \
        );                                      \
CYG_MACRO_END

#define HAL_MSBIT_INDEX(index, mask)            \
    CYG_MACRO_START                             \
    asm volatile (                              \
        "scan   %1, 0, %%l7;"                   \
        "mov    31, %0;"                        \
        "sub    %0, %%l7, %0"                   \
        : "=r"(index)                           \
        : "r"(mask)                             \
        : "l7"                                  \
        );                                      \
CYG_MACRO_END


//--------------------------------------------------------------------------
// Context Initialization
// Initialize the context of a thread.
// Arguments:
// _sparg_ 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.

externC CYG_ADDRESS
hal_thread_init_context(  CYG_WORD sparg,
                          CYG_WORD thread,
                          CYG_WORD entry,
                          CYG_WORD id ); 

#define HAL_THREAD_INIT_CONTEXT( _sparg_, _thread_, _entry_, _id_ )         \
CYG_MACRO_START                                                             \
    _sparg_ = hal_thread_init_context( (CYG_WORD)(_sparg_),                 \
                                       (CYG_WORD)(_thread_),                \
                                       (CYG_WORD)(_entry_),                 \
                                       (CYG_WORD)(_id_) );                  \
CYG_MACRO_END

//---------------------------------------------------------------------------
// 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));