/*
*********************************************************************************************************
*                                               uC/CPU
*                                    CPU CONFIGURATION & PORT LAYER
*
*                          (c) Copyright 2004-2005; Micrium, Inc.; Weston, FL
*
*                   All rights reserved.  Protected by international copyright laws.
*                   Knowledge of the source code may not be used to write a similar
*                   product.  This file may only be used in accordance with a license
*                   and should not be redistributed in any way.
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*
*                                      CPU CONFIGURATION DEFINES
*
* Filename      : cpu_def.h
* Version       : V1.13
* Programmer(s) : ITJ
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                       CPU WORD CONFIGURATION
*
* Note(s) : (1) Configure CPU_CFG_ADDR_SIZE & CPU_CFG_DATA_SIZE in 'cpu.h' with CPU's word sizes :
*
*                   CPU_WORD_SIZE_08             8-bit word size
*                   CPU_WORD_SIZE_16            16-bit word size
*                   CPU_WORD_SIZE_32            32-bit word size
*                   CPU_WORD_SIZE_64            64-bit word size            See Note #1a
*
*               (a) 64-bit word size NOT currently supported.
*
*               (b) Ideally, CPU_WORD_SIZE #define's would be calculated at compile-time through use of
*                   the sizeof() operator.  However, some compilers do NOT allow pre-processor directives
*                   to include run-time macro's -- e.g. 'sizeof()'.
*
*           (2) Configure CPU_CFG_ENDIAN_TYPE in 'cpu.h' with CPU's data-word-memory order :
*
*                   CPU_ENDIAN_TYPE_BIG         Big-   endian word order (CPU words' most  significant
*                                                                         octet @ lowest memory address)
*                   CPU_ENDIAN_TYPE_LITTLE      Little-endian word order (CPU words' least significant
*                                                                         octet @ lowest memory address)
*********************************************************************************************************
*/

                                                        /* ----------------------- CPU WORD SIZE ---------------------- */
#define  CPU_WORD_SIZE_08                          1    /*  8-bit word size = sizeof(CPU_INT08x).                       */
#define  CPU_WORD_SIZE_16                          2    /* 16-bit word size = sizeof(CPU_INT16x).                       */
#define  CPU_WORD_SIZE_32                          4    /* 32-bit word size = sizeof(CPU_INT32x).                       */
#define  CPU_WORD_SIZE_64                          8    /* 64-bit word size = sizeof(CPU_INT64x) [see Note #1a].        */


                                                        /* ------------------- CPU WORD-ENDIAN ORDER ------------------ */
#define  CPU_ENDIAN_TYPE_NONE                      0    /*                                                              */
#define  CPU_ENDIAN_TYPE_BIG                       1    /* Big-   endian word order (CPU words' most  significant ...   */
                                                        /*                           ... octet @ lowest mem addr).      */
#define  CPU_ENDIAN_TYPE_LITTLE                    2    /* Little-endian word order (CPU words' least significant ...   */
                                                        /*                           ... octet @ lowest mem addr).      */


/*$PAGE*/
/*
*********************************************************************************************************
*                                   CRITICAL SECTION CONFIGURATION
*
* Note(s) : (1) Configure CPU_CFG_CRITICAL_METHOD with CPU's/compiler's critical section method :
*
*                                                       Enter/Exit critical sections by ...
*
*                   CPU_CRITICAL_METHOD_INT_DIS_EN      Disable/Enable interrupts
*                   CPU_CRITICAL_METHOD_STATUS_STK      Push/Pop       interrupt status onto stack
*                   CPU_CRITICAL_METHOD_STATUS_LOCAL    Save/Restore   interrupt status to local variable
*
*               (a) CPU_CRITICAL_METHOD_INT_DIS_EN  is NOT a preferred method since it does NOT support 
*                   multiple levels of interrupts.  However, with some CPUs/compilers, this is the only 
*                   available method.
*
*               (b) CPU_CRITICAL_METHOD_STATUS_STK  is one preferred method since it DOES support multiple 
*                   levels of interrupts.  However, this method assumes that the compiler allows in-line 
*                   assembly AND will correctly modify the local stack pointer when interrupt status is 
*                   pushed/popped onto the stack.
*
*               (c) CPU_CRITICAL_METHOD_STATUS_LOCAL  is one preferred method since it DOES support multiple 
*                   levels of interrupts.  However, this method assumes that the compiler provides C-level 
*                   &/or assembly-level functionality for the following :
*
*                     ENTER CRITICAL SECTION :
*                       (a) Save    interrupt status into a local variable
*                       (b) Disable interrupts
*
*                     EXIT  CRITICAL SECTION :
*                       (c) Restore interrupt status from a local variable
*
*           (2) Critical section macro's most likely require inline assembly.  If the compiler does NOT 
*               allow inline assembly in C source files, critical section macro's MUST call an assembly 
*               subroutine defined in a 'cpu_a.asm' file located in the following software directory :
*
*                   \<CPU-Compiler Directory>\<cpu>\<compiler>\
*
*                       where
*                               <CPU-Compiler Directory>    directory path for common   CPU-compiler software
*                               <cpu>                       directory name for specific CPU
*                               <compiler>                  directory name for specific compiler
*
*           (3) To save/restore interrupt status, a local variable 'cpu_sr' of type 'CPU_SR' needs to
*               be declared.  Configure 'CPU_SR' data type in 'cpu.h' with the appropriate-sized CPU
*               data type large enough to completely store the CPU's/compiler's status word.
*********************************************************************************************************
*/

                                                        /* --------------- CPU CRITICAL SECTION METHODS --------------- */
#define  CPU_CRITICAL_METHOD_NONE                  0    /*                                                              */
#define  CPU_CRITICAL_METHOD_INT_DIS_EN            1    /* DIS/EN       ints.                                           */
#define  CPU_CRITICAL_METHOD_STATUS_STK            2    /* Push/Pop     int status onto stk.                            */
#define  CPU_CRITICAL_METHOD_STATUS_LOCAL          3    /* Save/Restore int status to local var.                        */

