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#ifndef CYGONCE_HAL_ARCH_H

#define CYGONCE_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, gthomas

// Contributors: nickg, gthomas

// Date:         1999-02-20

// Purpose:      Define architecture abstractions

// Usage:        #include <cyg/hal/hal_arch.h>

//              

//####DESCRIPTIONEND####

//

//==========================================================================

#include <pkgconf/hal.h>         // To decide on stack usage

#include <cyg/infra/cyg_type.h>

//

// CPSR Register defines

//

#define CPSR_IRQ_DISABLE        0x80    // IRQ disabled when =1

#define CPSR_FIQ_DISABLE        0x40    // FIQ disabled when =1

#define CPSR_THUMB_ENABLE       0x20    // Thumb mode when =1

#define CPSR_FIQ_MODE           0x11

#define CPSR_IRQ_MODE           0x12

#define CPSR_SUPERVISOR_MODE    0x13

#define CPSR_UNDEF_MODE         0x1B

#define CPSR_MODE_BITS          0x1F

#define CPSR_INITIAL (CPSR_IRQ_DISABLE|CPSR_FIQ_DISABLE|CPSR_SUPERVISOR_MODE)

#define CPSR_THREAD_INITIAL (CPSR_SUPERVISOR_MODE)

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

// Processor saved states:

// The layout of this structure is also defined in "arm.inc", for assembly

// code, which will be generated automatically if this file changes.

#define HAL_THREAD_CONTEXT_FIRST        0

#define HAL_THREAD_CONTEXT_R0           (0-HAL_THREAD_CONTEXT_FIRST)

#define HAL_THREAD_CONTEXT_R4           (4-HAL_THREAD_CONTEXT_FIRST)

#define HAL_THREAD_CONTEXT_R8           (8-HAL_THREAD_CONTEXT_FIRST)

#define HAL_THREAD_CONTEXT_R9           (9-HAL_THREAD_CONTEXT_FIRST)

#define HAL_THREAD_CONTEXT_R10          (10-HAL_THREAD_CONTEXT_FIRST)

#define HAL_THREAD_CONTEXT_LAST         10

#define HAL_NUM_THREAD_CONTEXT_REGS     (HAL_THREAD_CONTEXT_LAST - \

                                          HAL_THREAD_CONTEXT_FIRST+1)

// It seems that r0-r3,r12 are considered scratch by function calls

typedef struct

{

    // These are common to all saved states

    cyg_uint32  d[HAL_NUM_THREAD_CONTEXT_REGS] ;  // Data regs (r0..r10)

    cyg_uint32  fp;                               // (r11) Frame pointer

    cyg_uint32  ip;                               // (r12)

    cyg_uint32  sp;                               // (r13) Stack pointer

    cyg_uint32  lr;                               // (r14) Link Reg

    cyg_uint32  pc;                               // (r15) PC place holder

                                                  //       (never used)

    cyg_uint32  cpsr;                             // Condition Reg

    // These are only saved for exceptions and interrupts

    cyg_uint32  vector;                           // Vector number

    cyg_uint32  svc_lr;                           // saved svc mode lr

    cyg_uint32  svc_sp;                           // saved svc mode sp

} 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 macros

externC int hal_lsbindex(int);

externC int hal_msbindex(int);

#define HAL_LSBIT_INDEX(index, mask) index = hal_lsbindex(mask)

#define HAL_MSBIT_INDEX(index, mask) index = hal_msbindex(mask)

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

// Context Initialization

// Initialize the context of a thread.

// Arguments:

// _sparg_ name of variable containing current sp, will be changed to 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.

#define HAL_THREAD_INIT_CONTEXT( _sparg_, _thread_, _entry_, _id_ )         \

    CYG_MACRO_START                                                         \

    register CYG_WORD _sp_ = ((CYG_WORD)_sparg_) &~15;                      \

    register HAL_SavedRegisters *_regs_;                                    \

    int _i_;                                                                \

    _regs_ = (HAL_SavedRegisters *)((_sp_) - sizeof(HAL_SavedRegisters));   \

    for( _i_ = HAL_THREAD_CONTEXT_FIRST; _i_ <= HAL_THREAD_CONTEXT_LAST;    \

           _i_++ )                                                          \

        (_regs_)->d[_i_] = (_id_)|_i_;                                      \

    (_regs_)->d[00] = (CYG_WORD)(_thread_); /* R0 = arg1 = thread ptr */    \

    (_regs_)->sp = (CYG_WORD)(_sp_);        /* SP = top of stack      */    \

    (_regs_)->lr = (CYG_WORD)(_entry_);     /* LR = entry point       */    \

    (_regs_)->pc = (CYG_WORD)(_entry_);     /* PC = [initial] entry point */\

    (_regs_)->cpsr = (CPSR_THREAD_INITIAL); /* PSR = Interrupt enabled */   \

    _sparg_ = (CYG_ADDRESS)_regs_;                                          \

    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));

#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.

#define _stringify1(__arg) #__arg

#define _stringify(__arg) _stringify1(__arg)

#define HAL_BREAKINST_ARM          0xE7FFDEFE

#define HAL_BREAKINST_ARM_SIZE     4

#define HAL_BREAKINST_THUMB        0xbebe  // illegal instruction currently

#define HAL_BREAKINST_THUMB_SIZE   2

#ifdef __thumb__

# define HAL_BREAKPOINT(_label_)                         \

asm volatile (" .code 16;"                               \

              " .globl  " #_label_ ";"                   \

              #_label_":"                                \

              " .short " _stringify(HAL_BREAKINST_THUMB) \

    );

# define HAL_BREAKINST           HAL_BREAKINST_THUMB

# define HAL_BREAKINST_SIZE      HAL_BREAKINST_THUMB_SIZE

# define HAL_BREAKINST_TYPE      cyg_uint16

#else // __thumb__

#define HAL_BREAKPOINT(_label_)                   \

asm volatile (" .globl  " #_label_ ";"            \

              #_label_":"                         \

              " .word " _stringify(HAL_BREAKINST_ARM) \

    );

//#define HAL_BREAKINST           {0xFE, 0xDE, 0xFF, 0xE7}

#define HAL_BREAKINST            HAL_BREAKINST_ARM

#define HAL_BREAKINST_SIZE       HAL_BREAKINST_ARM_SIZE

#define HAL_BREAKINST_TYPE       cyg_uint32

#endif // __thumb__

extern cyg_uint32 __arm_breakinst;

extern cyg_uint16 __thumb_breakinst;

#define HAL_BREAKINST_ADDR(x) (((x)==2)? \

                              ((void*)&__thumb_breakinst) : \

                              ((void*)&__arm_breakinst))

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

// Thread register state manipulation for GDB support.

// Register layout expected by GDB

typedef struct

{

    cyg_uint32  gpr[16];

    cyg_uint32  f0[3];

    cyg_uint32  f1[3];

    cyg_uint32  f2[3];

    cyg_uint32  f3[3];

    cyg_uint32  f4[3];

    cyg_uint32  f5[3];

    cyg_uint32  f6[3];

    cyg_uint32  f7[3];

    cyg_uint32  fps;

    cyg_uint32  ps;

} GDB_Registers;

// 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_)

// Copy a set of coprocessor registers from a HAL_SavedRegisters structure

// into a GDB_Registers structure. GDB expects placeholders for FP regs

// even for non-FP targets, so we just zero fill the fields.

#define HAL_GET_GDB_COPROCESSOR_REGISTERS( _gdb_, _regs_ )      \

    CYG_MACRO_START                                             \

    cyg_uint32 *_p_ = _gdb_->f0;                                \

    for(_i_ = 0; _i_ < (8 * 3); _i_++)                          \

        *_p_++ = 0;                                             \

    _gdb_->fps = 0;                                             \

    CYG_MACRO_END

// Copy coprocessor registers from a GDB_Registers structure into a

// HAL_SavedRegisters structure.

#define HAL_SET_GDB_COPROCESSOR_REGISTERS( _regs_, _gdb_ )

// Copy a set of registers from a HAL_SavedRegisters structure into a

// GDB_Registers structure.

#define HAL_GET_GDB_REGISTERS( _aregval_, _regs_ )              \

    CYG_MACRO_START                                             \

    GDB_Registers *_gdb_ = (GDB_Registers *)(_aregval_);        \

    int _i_;                                                    \

                                                                \

    for( _i_ = 0; _i_ <= 10; _i_++ )                            \

        _gdb_->gpr[_i_] = (_regs_)->d[_i_];                     \

                                                                \

    _gdb_->gpr[11] = (_regs_)->fp;                              \

    _gdb_->gpr[12] = (_regs_)->ip;                              \

    _gdb_->gpr[13] = (_regs_)->sp;                              \

    _gdb_->gpr[14] = (_regs_)->lr;                              \

    _gdb_->gpr[15] = (_regs_)->pc;                              \

    _gdb_->ps = (_regs_)->cpsr;                                 \

    HAL_GET_GDB_COPROCESSOR_REGISTERS(_gdb_,_regs_);            \

    CYG_MACRO_END

// Copy a set of registers from a GDB_Registers structure into a

// HAL_SavedRegisters structure.

#define HAL_SET_GDB_REGISTERS( _regs_ , _aregval_ )             \

    CYG_MACRO_START                                             \

    GDB_Registers *_gdb_ = (GDB_Registers *)(_aregval_);        \

    int _i_;                                                    \

                                                                \

    for( _i_ = 0; _i_ <= 10; _i_++ )                            \

        (_regs_)->d[_i_] = _gdb_->gpr[_i_];                     \

                                                                \

    (_regs_)->fp = _gdb_->gpr[11];                              \

    (_regs_)->ip = _gdb_->gpr[12];                              \

    (_regs_)->sp = _gdb_->gpr[13];                              \

    (_regs_)->lr = _gdb_->gpr[14];                              \

    (_regs_)->pc = _gdb_->gpr[15];                              \

    (_regs_)->cpsr = _gdb_->ps;                                 \

    HAL_SET_GDB_COPROCESSOR_REGISTERS(_regs_,_gdb_);            \

    CYG_MACRO_END

#if defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT) || defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)

#define HAL_GET_PROFILE_INFO( _thepc_, _thesp_ )                \

    CYG_MACRO_START                                             \

    extern HAL_SavedRegisters *hal_saved_interrupt_state;       \

    if ( hal_saved_interrupt_state ) {                          \

        (_thepc_) = (char *)(hal_saved_interrupt_state->pc);    \

        (_thesp_) = (char *)(hal_saved_interrupt_state->sp);    \

    }                                                           \

    CYG_MACRO_END

#endif

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

// HAL setjmp

#define CYGARC_JMP_BUF_SIZE 16  // Actually 11, but some room left over

typedef cyg_uint32 hal_jmp_buf[CYGARC_JMP_BUF_SIZE];

externC int hal_setjmp(hal_jmp_buf env);

externC void hal_longjmp(hal_jmp_buf env, int val);

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

// Idle thread code.

// This macro is called in the idle thread loop, and gives the HAL the

// chance to insert code. Typical idle thread behaviour might be to halt the

// processor.

externC void hal_idle_thread_action(cyg_uint32 loop_count);

#define HAL_IDLE_THREAD_ACTION(_count_) hal_idle_thread_action(_count_)

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

// Minimal and sensible stack sizes: the intention is that applications

// will use these to provide a stack size in the first instance prior to

// proper analysis.  Idle thread stack should be this big.

//    THESE ARE NOT INTENDED TO BE MICROMETRICALLY ACCURATE FIGURES.

//           THEY ARE HOWEVER ENOUGH TO START PROGRAMMING.

// YOU MUST MAKE YOUR STACKS LARGER IF YOU HAVE LARGE "AUTO" VARIABLES!

// This is not a config option because it should not be adjusted except

// under "enough rope" sort of disclaimers.

// A minimal, optimized stack frame, rounded up - no autos

#define CYGNUM_HAL_STACK_FRAME_SIZE (4 * 20)

// Stack needed for a context switch: this is implicit in the estimate for

// interrupts so not explicitly used below:

#define CYGNUM_HAL_STACK_CONTEXT_SIZE (4 * 20)

// Interrupt + call to ISR, interrupt_end() and the DSR

#define CYGNUM_HAL_STACK_INTERRUPT_SIZE \

    ((4 * 20) + 2 * CYGNUM_HAL_STACK_FRAME_SIZE)

// Space for the maximum number of nested interrupts, plus room to call functions

#define CYGNUM_HAL_MAX_INTERRUPT_NESTING 4

#define CYGNUM_HAL_STACK_SIZE_MINIMUM \

        (CYGNUM_HAL_MAX_INTERRUPT_NESTING * CYGNUM_HAL_STACK_INTERRUPT_SIZE + \

         2 * CYGNUM_HAL_STACK_FRAME_SIZE)

#define CYGNUM_HAL_STACK_SIZE_TYPICAL \

        (CYGNUM_HAL_STACK_SIZE_MINIMUM + \

         16 * CYGNUM_HAL_STACK_FRAME_SIZE)

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

// Macros for switching context between two eCos instances (jump from

// code in ROM to code in RAM or vice versa).

#define CYGARC_HAL_SAVE_GP()

#define CYGARC_HAL_RESTORE_GP()

#endif // CYGONCE_HAL_ARCH_H

// End of hal_arch.h