327 lines
8.0 KiB
C
327 lines
8.0 KiB
C
/* Copyright (C) 1994, 1997 Free Software Foundation, Inc.
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Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
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On-Line Applications Research Corporation.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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/* i386.h
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*
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* This file contains macros which are used to access i80386
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* registers which are not addressable by C. This file contains
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* functions which are useful to those developing target
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* specific support routines.
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*/
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#ifndef i386_h__
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#define i386_h__
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typedef unsigned char unsigned8;
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typedef unsigned short unsigned16;
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typedef unsigned int unsigned32;
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#define disable_intr( isrlevel ) \
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{ (isrlevel) = 0; \
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asm volatile ( "pushf ; \
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pop %0 ; \
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cli " \
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: "=r" ((isrlevel)) : "0" ((isrlevel)) ); \
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}
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#define enable_intr( isrlevel ) \
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{ asm volatile ( "push %0 ; \
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popf " \
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: "=r" ((isrlevel)) : "0" ((isrlevel)) ); \
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}
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#define delay( _microseconds ) \
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{ \
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unsigned32 _counter; \
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\
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_counter = (_microseconds); \
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\
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asm volatile ( "0: nop;" \
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" mov %0,%0 ;" \
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" loop 0" : "=c" (_counter) \
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: "0" (_counter) \
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); \
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\
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}
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/* segment access functions */
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static inline unsigned16 get_cs()
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{
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register unsigned16 segment = 0;
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asm volatile ( "movw %%cs,%0" : "=r" (segment) : "0" (segment) );
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return segment;
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}
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static inline unsigned16 get_ds()
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{
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register unsigned16 segment = 0;
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asm volatile ( "movw %%ds,%0" : "=r" (segment) : "0" (segment) );
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return segment;
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}
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static inline unsigned16 get_es()
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{
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register unsigned16 segment = 0;
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asm volatile ( "movw %%es,%0" : "=r" (segment) : "0" (segment) );
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return segment;
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}
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static inline unsigned16 get_ss()
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{
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register unsigned16 segment = 0;
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asm volatile ( "movw %%ss,%0" : "=r" (segment) : "0" (segment) );
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return segment;
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}
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static inline unsigned16 get_fs()
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{
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register unsigned16 segment = 0;
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asm volatile ( "movw %%fs,%0" : "=r" (segment) : "0" (segment) );
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return segment;
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}
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static inline unsigned16 get_gs()
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{
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register unsigned16 segment = 0;
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asm volatile ( "movw %%gs,%0" : "=r" (segment) : "0" (segment) );
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return segment;
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}
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/* i80x86 I/O instructions */
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#define outport_byte( _port, _value ) \
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{ register unsigned16 __port = _port; \
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register unsigned8 __value = _value; \
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\
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asm volatile ( "outb %0,%1" : "=a" (__value), "=d" (__port) \
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: "0" (__value), "1" (__port) \
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); \
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}
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#define outport_word( _port, _value ) \
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{ register unsigned16 __port = _port; \
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register unsigned16 __value = _value; \
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\
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asm volatile ( "outw %0,%1" : "=a" (__value), "=d" (__port) \
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: "0" (__value), "1" (__port) \
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); \
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}
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#define outport_long( _port, _value ) \
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{ register unsigned16 __port = _port; \
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register unsigned32 __value = _value; \
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\
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asm volatile ( "outl %0,%1" : "=a" (__value), "=d" (__port) \
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: "0" (__value), "1" (__port) \
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); \
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}
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#define inport_byte( _port, _value ) \
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{ register unsigned16 __port = _port; \
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register unsigned8 __value = 0; \
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\
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asm volatile ( "inb %1,%0" : "=a" (__value), "=d" (__port) \
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: "0" (__value), "1" (__port) \
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); \
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_value = __value; \
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}
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#define inport_word( _port, _value ) \
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{ register unsigned16 __port = _port; \
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register unsigned16 __value = 0; \
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\
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asm volatile ( "inw %1,%0" : "=a" (__value), "=d" (__port) \
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: "0" (__value), "1" (__port) \
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); \
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_value = __value; \
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}
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#define inport_long( _port, _value ) \
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{ register unsigned16 __port = _port; \
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register unsigned32 __value = 0; \
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\
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asm volatile ( "inl %1,%0" : "=a" (__value), "=d" (__port) \
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: "0" (__value), "1" (__port) \
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); \
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_value = __value; \
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}
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/* structures */
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/* See Chapter 5 - Memory Management in i386 manual */
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struct GDT_slot {
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unsigned16 limit_0_15;
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unsigned16 base_0_15;
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unsigned8 base_16_23;
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unsigned8 type_dt_dpl_p;
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unsigned8 limit_16_19_granularity;
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unsigned8 base_24_31;
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};
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/* See Chapter 9 - Exceptions and Interrupts in i386 manual
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*
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* NOTE: This is the IDT entry for interrupt gates ONLY.
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*/
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struct IDT_slot {
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unsigned16 offset_0_15;
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unsigned16 segment_selector;
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unsigned8 reserved;
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unsigned8 p_dpl;
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unsigned16 offset_16_31;
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};
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struct DTR_load_save_format {
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unsigned16 limit;
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unsigned32 physical_address;
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};
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/* variables */
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extern struct IDT_slot Interrupt_descriptor_table[ 256 ];
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extern struct GDT_slot Global_descriptor_table[ 8192 ];
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/* functions */
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#ifdef CPU_INITIALIZE
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#define EXTERN
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#else
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#undef EXTERN
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#define EXTERN extern
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#endif
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void *Logical_to_physical(
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unsigned16 segment,
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void *address
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);
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void *Physical_to_logical(
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unsigned16 segment,
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void *address
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);
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/* complicated static inline functions */
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#define get_GDTR( _gdtr_address ) \
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{ \
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void *_gdtr = (_gdtr_address); \
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\
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asm volatile( "sgdt (%0)" : "=r" (_gdtr) : "0" (_gdtr) ); \
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}
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#define get_GDT_slot( _gdtr_base, _segment, _slot_address ) \
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{ \
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register unsigned32 _gdt_slot = (_gdtr_base) + (_segment); \
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register volatile void *_slot = (_slot_address); \
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register unsigned32 _temporary = 0; \
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\
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asm volatile( "movl %%gs:(%0),%1 ; \
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movl %1,(%2) ; \
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movl %%gs:4(%0),%1 ; \
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movl %1,4(%2)" \
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: "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \
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: "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \
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); \
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}
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#define set_GDT_slot( _gdtr_base, _segment, _slot_address ) \
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{ \
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register unsigned32 _gdt_slot = (_gdtr_base) + (_segment); \
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register volatile void *_slot = (_slot_address); \
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register unsigned32 _temporary = 0; \
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\
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asm volatile( "movl (%2),%1 ; \
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movl %1,%%gs:(%0) ; \
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movl 4(%2),%1 ; \
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movl %1,%%gs:4(%0) \
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" \
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: "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \
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: "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \
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); \
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}
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static inline void set_segment(
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unsigned16 segment,
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unsigned32 base,
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unsigned32 limit
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)
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{
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struct DTR_load_save_format gdtr;
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volatile struct GDT_slot Gdt_slot;
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volatile struct GDT_slot *gdt_slot = &Gdt_slot;
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unsigned16 tmp_segment = 0;
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unsigned32 limit_adjusted;
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/* load physical address of the GDT */
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get_GDTR( &gdtr );
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gdt_slot->type_dt_dpl_p = 0x92; /* present, dpl=0, */
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/* application=1, */
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/* type=data read/write */
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gdt_slot->limit_16_19_granularity = 0x40; /* 32 bit segment */
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limit_adjusted = limit;
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if ( limit > 4095 ) {
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gdt_slot->limit_16_19_granularity |= 0x80; /* set granularity bit */
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limit_adjusted /= 4096;
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}
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gdt_slot->limit_16_19_granularity |= (limit_adjusted >> 16) & 0xff;
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gdt_slot->limit_0_15 = limit_adjusted & 0xffff;
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gdt_slot->base_0_15 = base & 0xffff;
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gdt_slot->base_16_23 = (base >> 16) & 0xff;
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gdt_slot->base_24_31 = (base >> 24);
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set_GDT_slot( gdtr.physical_address, segment, gdt_slot );
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/* Now, reload all segment registers so the limit takes effect. */
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asm volatile( "movw %%ds,%0 ; movw %0,%%ds\n"
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"movw %%es,%0 ; movw %0,%%es\n"
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"movw %%fs,%0 ; movw %0,%%fs\n"
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"movw %%gs,%0 ; movw %0,%%gs\n"
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"movw %%ss,%0 ; movw %0,%%ss"
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: "=r" (tmp_segment)
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: "0" (tmp_segment)
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);
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}
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#endif
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/* end of include file */
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