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#ifndef CYGONCE_HAL_VAR_BANK_H
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#define CYGONCE_HAL_VAR_BANK_H
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//=============================================================================
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//
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// hal_var_bank.h
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//
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// Architecture abstractions for variants without banked registers
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//
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//=============================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//=============================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s): jskov
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// Contributors:jskov
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// Date: 2002-01-11
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// Purpose: Architecture abstractions for variants without banked registers
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//
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//####DESCRIPTIONEND####
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//
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//=============================================================================
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//-----------------------------------------------------------------------------
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// Processor saved states:
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typedef struct
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{
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// These are common to all saved states
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cyg_uint32 r[16]; // Data regs
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cyg_uint32 macl; // Multiply and accumulate - low
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cyg_uint32 mach; // Multiply and accumulate - high
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cyg_uint32 pr; // Procedure Reg
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#if 0 // FIXME: how are these accessed?
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cyg_uint32 mod; // Modulo register
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cyg_uint32 rs; // Repeat start
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cyg_uint32 re; // Repeat end
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#endif
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cyg_uint32 sr; // Status Reg
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cyg_uint32 pc; // Program Counter
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// This marks the limit of state saved during a context switch and
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// is used to calculate necessary stack allocation for context switches.
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// It would probably be better to have a union instead...
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cyg_uint32 context_size[0];
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// These are only saved on interrupts
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cyg_uint32 vbr; // Vector Base Register
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cyg_uint32 gbr; // Global Base Register
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// These are only saved on interrupts
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cyg_uint32 event; // vector number
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} HAL_SavedRegisters;
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//-----------------------------------------------------------------------------
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// Context Initialization
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// Initialize the context of a thread.
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// Arguments:
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// _sparg_ name of variable containing current sp, will be written with new sp
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// _thread_ thread object address, passed as argument to entry point
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// _entry_ entry point address.
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// _id_ bit pattern used in initializing registers, for debugging.
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#define HAL_THREAD_INIT_CONTEXT( _sparg_, _thread_, _entry_, _id_ ) \
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CYG_MACRO_START \
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register HAL_SavedRegisters *_regs_; \
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int _i_; \
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_regs_ = (HAL_SavedRegisters *)((_sparg_) - sizeof(HAL_SavedRegisters)); \
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for( _i_ = 0; _i_ < 16; _i_++ ) (_regs_)->r[_i_] = (_id_)|_i_; \
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(_regs_)->r[15] = (CYG_WORD)(_regs_); /* SP = top of stack */ \
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(_regs_)->r[04] = (CYG_WORD)(_thread_); /* R4 = arg1 = thread ptr */ \
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(_regs_)->mach = 0; /* MACH = 0 */ \
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(_regs_)->macl = 0; /* MACL = 0 */ \
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(_regs_)->pr = (CYG_WORD)(_entry_); /* PR = entry point */ \
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(_regs_)->sr = 0; /* SR = enable interrupts */ \
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(_regs_)->pc = (CYG_WORD)(_entry_); /* set PC for thread dbg */ \
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_sparg_ = (CYG_ADDRESS)_regs_; \
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CYG_MACRO_END
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//-----------------------------------------------------------------------------
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// Thread register state manipulation for GDB support.
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// Translate a stack pointer as saved by the thread context macros above into
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// a pointer to a HAL_SavedRegisters structure.
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#define HAL_THREAD_GET_SAVED_REGISTERS( _sp_, _regs_ ) \
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(_regs_) = (HAL_SavedRegisters *)(_sp_)
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// Copy a set of registers from a HAL_SavedRegisters structure into a
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// GDB ordered array.
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#define HAL_GET_GDB_REGISTERS( _aregval_, _regs_ ) \
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CYG_MACRO_START \
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CYG_ADDRWORD *_regval_ = (CYG_ADDRWORD *)(_aregval_); \
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int _i_; \
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\
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for( _i_ = 0; _i_ < 16; _i_++ ) \
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_regval_[_i_] = (_regs_)->r[_i_]; \
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\
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_regval_[16] = (_regs_)->pc; \
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_regval_[17] = (_regs_)->pr; \
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_regval_[18] = (_regs_)->gbr; \
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_regval_[19] = (_regs_)->vbr; \
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_regval_[20] = (_regs_)->mach; \
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_regval_[21] = (_regs_)->macl; \
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_regval_[22] = (_regs_)->sr; \
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\
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/* 23-51 not used atm. */ \
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CYG_MACRO_END
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// Copy a GDB ordered array into a HAL_SavedRegisters structure.
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#define HAL_SET_GDB_REGISTERS( _regs_ , _aregval_ ) \
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CYG_MACRO_START \
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CYG_ADDRWORD *_regval_ = (CYG_ADDRWORD *)(_aregval_); \
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int _i_; \
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\
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for( _i_ = 0; _i_ < 16; _i_++ ) \
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(_regs_)->r[_i_] = _regval_[_i_]; \
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\
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(_regs_)->pc = _regval_[16]; \
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(_regs_)->pr = _regval_[17]; \
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(_regs_)->gbr = _regval_[18]; \
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(_regs_)->vbr = _regval_[19]; \
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(_regs_)->mach = _regval_[20]; \
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(_regs_)->macl = _regval_[21]; \
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(_regs_)->sr = _regval_[22]; \
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CYG_MACRO_END
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//--------------------------------------------------------------------------
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// CPU address space translation macros
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#define CYGARC_BUS_ADDRESS(x) ((CYG_ADDRWORD)(x) & 0x1fffffff)
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#define CYGARC_CACHED_ADDRESS(x) (CYGARC_BUS_ADDRESS(x)|0x00000000)
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#define CYGARC_UNCACHED_ADDRESS(x) (CYGARC_BUS_ADDRESS(x)|0x20000000)
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//-----------------------------------------------------------------------------
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#endif // CYGONCE_HAL_VAR_BANK_H
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// End of hal_var_bank.h
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