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/* registers.h
*
* This file contains definition and constants related to Intel Cpu
*
* COPYRIGHT (c) 1998 valette@crf.canon.fr
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#ifndef _LIBCPU_i386_REGISTERS_H
#define _LIBCPU_i386_REGISTERS_H
/*
* definition related to EFLAGS
*/
#define EFLAGS_CARRY 0x1
#define EFLAGS_PARITY 0x4
#define EFLAGS_AUX_CARRY 0x10
#define EFLAGS_ZERO 0x40
#define EFLAGS_SIGN 0x80
#define EFLAGS_TRAP 0x100
#define EFLAGS_INTR_ENABLE 0x200
#define EFLAGS_DIRECTION 0x400
#define EFLAGS_OVERFLOW 0x800
#define EFLAGS_IOPL_MASK 0x3000
#define EFLAGS_NESTED_TASK 0x8000
#define EFLAGS_RESUME 0x10000
#define EFLAGS_VIRTUAL_MODE 0x20000
#define EFLAGS_ALIGN_CHECK 0x40000
#define EFLAGS_VIRTUAL_INTR 0x80000
#define EFLAGS_VIRTUAL_INTR_PEND 0x100000
#define EFLAGS_ID 0x200000
/*
* definitions related to CR0
*/
#define CR0_PROTECTION_ENABLE 0x1
#define CR0_MONITOR_COPROC 0x2
#define CR0_COPROC_SOFT_EMUL 0x4
#define CR0_FLOATING_INSTR_EXCEPTION 0x8
#define CR0_EXTENSION_TYPE 0x10
#define CR0_NUMERIC_ERROR 0x20
#define CR0_WRITE_PROTECT 0x10000
#define CR0_ALIGMENT_MASK 0x40000
#define CR0_NO_WRITE_THROUGH 0x20000000
#define CR0_PAGE_LEVEL_CACHE_DISABLE 0x40000000
#define CR0_PAGING 0x80000000
/*
* definitions related to CR3
*/
#define CR3_PAGE_CACHE_DISABLE 0x10
#define CR3_PAGE_WRITE_THROUGH 0x8
#ifndef ASM
/*
* definition of eflags registers has a bit field structure
*/
typedef struct {
/*
* fist byte : bits 0->7
*/
unsigned int carry : 1;
unsigned int : 1;
unsigned int parity : 1;
unsigned int : 1;
unsigned int auxiliary_carry : 1;
unsigned int : 1;
unsigned int zero : 1; /* result is zero */
unsigned int sign : 1; /* result is less than zero */
/*
* Second byte : bits 7->15
*/
unsigned int trap : 1;
unsigned int intr_enable : 1; /* set => intr on */
unsigned int direction : 1; /* set => autodecrement */
unsigned int overflow : 1;
unsigned int IO_privilege : 2;
unsigned int nested_task : 1;
unsigned int : 1;
/*
* Third byte : bits 15->23
*/
unsigned int resume : 1;
unsigned int virtual_mode : 1;
unsigned int aligment_check : 1;
unsigned int virtual_intr : 1;
unsigned int virtual_intr_pending : 1;
unsigned int id : 1;
unsigned int : 2;
/*
* fourth byte : bits 24->31 : UNUSED
*/
unsigned int : 8;
}eflags_bits;
typedef union {
eflags_bits eflags;
unsigned int i;
}eflags;
/*
* definition of eflags registers has a bit field structure
*/
typedef struct {
/*
* fist byte : bits 0->7
*/
unsigned int protection_enable : 1;
unsigned int monitor_coproc : 1;
unsigned int coproc_soft_emul : 1;
unsigned int floating_instr_except : 1;
unsigned int extension_type : 1;
unsigned int numeric_error : 1;
unsigned int : 2;
/*
* second byte 8->15 : UNUSED
*/
unsigned int : 8;
/*
* third byte 16->23
*/
unsigned int write_protect : 1;
unsigned int : 1;
unsigned int aligment_mask : 1;
unsigned int : 1;
unsigned int : 4;
/*
* fourth byte 24->31
*/
unsigned int : 4;
unsigned int : 1;
unsigned int no_write_through : 1;
unsigned int page_level_cache_disable : 1;
unsigned int paging : 1;
}cr0_bits;
typedef union {
cr0_bits cr0;
unsigned int i;
}cr0;
/*
* definition of cr3 registers has a bit field structure
*/
typedef struct {
unsigned int : 3;
unsigned int page_write_transparent : 1;
unsigned int page_cache_disable : 1;
unsigned int : 7;
unsigned int page_directory_base :20;
}cr3_bits;
typedef union {
cr3_bits cr3;
unsigned int i;
}cr3;
#endif
#endif
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