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Diffstat (limited to 'cpukit/score/cpu/i386/rtems/score/i386.h')
| -rw-r--r-- | cpukit/score/cpu/i386/rtems/score/i386.h | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/cpukit/score/cpu/i386/rtems/score/i386.h b/cpukit/score/cpu/i386/rtems/score/i386.h new file mode 100644 index 0000000000..0eb936a6f7 --- /dev/null +++ b/cpukit/score/cpu/i386/rtems/score/i386.h @@ -0,0 +1,191 @@ +/* i386.h + * + * This include file contains information pertaining to the Intel + * i386 processor. + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * 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 __i386_h +#define __i386_h + +#ifdef __cplusplus +extern "C" { +#endif + +/* + * This section contains the information required to build + * RTEMS for a particular member of the Intel i386 + * family when executing in protected mode. It does + * this by setting variables to indicate which implementation + * dependent features are present in a particular member + * of the family. + * + * Currently recognized: + * i386_fp (i386 DX or SX w/i387) + * i386_nofp (i386 DX or SX w/o i387) + * i486dx + * i486sx + * pentium + * + * CPU Model Feature Flags: + * + * I386_HAS_BSWAP: Defined to "1" if the instruction for endian swapping + * (bswap) should be used. This instruction appears to + * be present in all i486's and above. + * + * I386_HAS_FPU: Defined to "1" if the CPU has an FPU. + * + */ + +#if defined(i386_fp) + +#define CPU_MODEL_NAME "i386 with i387" +#define I386_HAS_BSWAP 0 + +#elif defined(i386_nofp) + +#define CPU_MODEL_NAME "i386 w/o i387" +#define I386_HAS_FPU 0 +#define I386_HAS_BSWAP 0 + +#elif defined(i486dx) + +#define CPU_MODEL_NAME "i486dx" + +#elif defined(i486sx) + +#define CPU_MODEL_NAME "i486sx" +#define I386_HAS_FPU 0 + +#elif defined(pentium) + +#define CPU_MODEL_NAME "Pentium" + +#else + +#error "Unsupported CPU Model" + +#endif + +/* + * Set default values for CPU model feature flags + * + * NOTE: These settings are chosen to reflect most of the family members. + */ + +#ifndef I386_HAS_FPU +#define I386_HAS_FPU 1 +#endif + +#ifndef I386_HAS_BSWAP +#define I386_HAS_BSWAP 1 +#endif + +/* + * Define the name of the CPU family. + */ + +#define CPU_NAME "Intel i386" + +#ifndef ASM + +/* + * The following routine swaps the endian format of an unsigned int. + * It must be static so it can be referenced indirectly. + */ + +static inline unsigned int i386_swap_U32( + unsigned int value +) +{ + unsigned long lout; + +#if (I386_HAS_BSWAP == 0) + asm volatile( "rorw $8,%%ax;" + "rorl $16,%0;" + "rorw $8,%%ax" : "=a" (lout) : "0" (value) ); +#else + __asm__ volatile( "bswap %0" : "=r" (lout) : "0" (value)); +#endif + return( lout ); +} + +static inline unsigned int i386_swap_U16( + unsigned int value +) +{ + unsigned short sout; + + __asm__ volatile( "rorw $8,%0" : "=r" (sout) : "0" (value)); + return (sout); +} + + +/* routines */ + +/* + * i386_Logical_to_physical + * + * Converts logical address to physical address. + */ + +void *i386_Logical_to_physical( + unsigned short segment, + void *address +); + +/* + * i386_Physical_to_logical + * + * Converts physical address to logical address. + */ + +void *i386_Physical_to_logical( + unsigned short segment, + void *address +); + + +/* + * "Simpler" names for a lot of the things defined in this file + */ + +/* segment access routines */ + +#define get_cs() i386_get_cs() +#define get_ds() i386_get_ds() +#define get_es() i386_get_es() +#define get_ss() i386_get_ss() +#define get_fs() i386_get_fs() +#define get_gs() i386_get_gs() + +#define CPU_swap_u32( _value ) i386_swap_U32( _value ) +#define CPU_swap_u16( _value ) i386_swap_U16( _value ) + +/* i80x86 I/O instructions */ + +#define outport_byte( _port, _value ) i386_outport_byte( _port, _value ) +#define outport_word( _port, _value ) i386_outport_word( _port, _value ) +#define outport_long( _port, _value ) i386_outport_long( _port, _value ) +#define inport_byte( _port, _value ) i386_inport_byte( _port, _value ) +#define inport_word( _port, _value ) i386_inport_word( _port, _value ) +#define inport_long( _port, _value ) i386_inport_long( _port, _value ) + + +#ifdef __cplusplus +} +#endif + +#endif /* !ASM */ + +#endif +/* end of include file */ |