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+/* Copyright (C) 1994 Free Software Foundation, Inc.
+ Contributed by Joel Sherrill (jsherril@redstone-emh2.army.mil),
+ On-Line Applications Research Corporation.
+
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB. If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+/* i386.h
+ *
+ * This file contains macros which are used to access i80386
+ * registers which are not addressable by C. This file contains
+ * functions which are useful to those developing target
+ * specific support routines.
+ */
+
+#ifndef i386_h__
+#define i386_h__
+
+typedef unsigned char unsigned8;
+typedef unsigned short unsigned16;
+typedef unsigned int unsigned32;
+
+#define disable_intr( isrlevel ) \
+ { (isrlevel) = 0; \
+ asm volatile ( "pushf ; \
+ pop %0 ; \
+ cli " \
+ : "=r" ((isrlevel)) : "0" ((isrlevel)) ); \
+ }
+
+
+#define enable_intr( isrlevel ) \
+ { asm volatile ( "push %0 ; \
+ popf " \
+ : "=r" ((isrlevel)) : "0" ((isrlevel)) ); \
+ }
+
+#define delay( _microseconds ) \
+ { \
+ unsigned32 _counter; \
+ \
+ _counter = (_microseconds); \
+ \
+ asm volatile ( "0: nop;" \
+ " mov %0,%0 ;" \
+ " loop 0" : "=c" (_counter) \
+ : "0" (_counter) \
+ ); \
+ \
+ }
+
+/* segment access functions */
+
+static inline unsigned16 get_cs()
+{
+ register unsigned16 segment = 0;
+
+ asm volatile ( "movw %%cs,%0" : "=r" (segment) : "0" (segment) );
+
+ return segment;
+}
+
+static inline unsigned16 get_ds()
+{
+ register unsigned16 segment = 0;
+
+ asm volatile ( "movw %%ds,%0" : "=r" (segment) : "0" (segment) );
+
+ return segment;
+}
+
+static inline unsigned16 get_es()
+{
+ register unsigned16 segment = 0;
+
+ asm volatile ( "movw %%es,%0" : "=r" (segment) : "0" (segment) );
+
+ return segment;
+}
+
+static inline unsigned16 get_ss()
+{
+ register unsigned16 segment = 0;
+
+ asm volatile ( "movw %%ss,%0" : "=r" (segment) : "0" (segment) );
+
+ return segment;
+}
+
+static inline unsigned16 get_fs()
+{
+ register unsigned16 segment = 0;
+
+ asm volatile ( "movw %%fs,%0" : "=r" (segment) : "0" (segment) );
+
+ return segment;
+}
+
+static inline unsigned16 get_gs()
+{
+ register unsigned16 segment = 0;
+
+ asm volatile ( "movw %%gs,%0" : "=r" (segment) : "0" (segment) );
+
+ return segment;
+}
+
+/* i80x86 I/O instructions */
+
+#define outport_byte( _port, _value ) \
+ { register unsigned16 __port = _port; \
+ register unsigned8 __value = _value; \
+ \
+ asm volatile ( "outb %0,%1" : "=a" (__value), "=d" (__port) \
+ : "0" (__value), "1" (__port) \
+ ); \
+ }
+
+#define outport_word( _port, _value ) \
+ { register unsigned16 __port = _port; \
+ register unsigned16 __value = _value; \
+ \
+ asm volatile ( "outw %0,%1" : "=a" (__value), "=d" (__port) \
+ : "0" (__value), "1" (__port) \
+ ); \
+ }
+
+#define outport_long( _port, _value ) \
+ { register unsigned16 __port = _port; \
+ register unsigned32 __value = _value; \
+ \
+ asm volatile ( "outl %0,%1" : "=a" (__value), "=d" (__port) \
+ : "0" (__value), "1" (__port) \
+ ); \
+ }
+
+#define inport_byte( _port, _value ) \
+ { register unsigned16 __port = _port; \
+ register unsigned8 __value = 0; \
+ \
+ asm volatile ( "inb %1,%0" : "=a" (__value), "=d" (__port) \
+ : "0" (__value), "1" (__port) \
+ ); \
+ _value = __value; \
+ }
+
+#define inport_word( _port, _value ) \
+ { register unsigned16 __port = _port; \
+ register unsigned16 __value = 0; \
+ \
+ asm volatile ( "inw %1,%0" : "=a" (__value), "=d" (__port) \
+ : "0" (__value), "1" (__port) \
+ ); \
+ _value = __value; \
+ }
+
+#define inport_long( _port, _value ) \
+ { register unsigned16 __port = _port; \
+ register unsigned32 __value = 0; \
+ \
+ asm volatile ( "inl %1,%0" : "=a" (__value), "=d" (__port) \
+ : "0" (__value), "1" (__port) \
+ ); \
+ _value = __value; \
+ }
+
+/* structures */
+
+/* See Chapter 5 - Memory Management in i386 manual */
+
+struct GDT_slot {
+ unsigned16 limit_0_15;
+ unsigned16 base_0_15;
+ unsigned8 base_16_23;
+ unsigned8 type_dt_dpl_p;
+ unsigned8 limit_16_19_granularity;
+ unsigned8 base_24_31;
+};
+
+/* See Chapter 9 - Exceptions and Interrupts in i386 manual
+ *
+ * NOTE: This is the IDT entry for interrupt gates ONLY.
+ */
+
+struct IDT_slot {
+ unsigned16 offset_0_15;
+ unsigned16 segment_selector;
+ unsigned8 reserved;
+ unsigned8 p_dpl;
+ unsigned16 offset_16_31;
+};
+
+struct DTR_load_save_format {
+ unsigned16 limit;
+ unsigned32 physical_address;
+};
+
+/* variables */
+
+extern struct IDT_slot Interrupt_descriptor_table[ 256 ];
+extern struct GDT_slot Global_descriptor_table[ 8192 ];
+
+/* functions */
+
+#ifdef CPU_INITIALIZE
+#define EXTERN
+#else
+#undef EXTERN
+#define EXTERN extern
+#endif
+
+void *Logical_to_physical(
+ unsigned16 segment,
+ void *address
+);
+
+void *Physical_to_logical(
+ unsigned16 segment,
+ void *address
+);
+
+/* complicated static inline functions */
+
+#define get_GDTR( _gdtr_address ) \
+ { \
+ void *_gdtr = (_gdtr_address); \
+ \
+ asm volatile( "sgdt (%0)" : "=r" (_gdtr) : "0" (_gdtr) ); \
+ }
+
+#define get_GDT_slot( _gdtr_base, _segment, _slot_address ) \
+ { \
+ register unsigned32 _gdt_slot = (_gdtr_base) + (_segment); \
+ register volatile void *_slot = (_slot_address); \
+ register unsigned32 _temporary = 0; \
+ \
+ asm volatile( "movl %%gs:(%0),%1 ; \
+ movl %1,(%2) ; \
+ movl %%gs:4(%0),%1 ; \
+ movl %1,4(%2)" \
+ : "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \
+ : "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \
+ ); \
+ }
+
+#define set_GDT_slot( _gdtr_base, _segment, _slot_address ) \
+ { \
+ register unsigned32 _gdt_slot = (_gdtr_base) + (_segment); \
+ register volatile void *_slot = (_slot_address); \
+ register unsigned32 _temporary = 0; \
+ \
+ asm volatile( "movl (%2),%1 ; \
+ movl %1,%%gs:(%0) ; \
+ movl 4(%2),%1 ; \
+ movl %1,%%gs:4(%0) \
+ " \
+ : "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \
+ : "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \
+ ); \
+ }
+
+static inline void set_segment(
+ unsigned16 segment,
+ unsigned32 base,
+ unsigned32 limit
+)
+{
+ struct DTR_load_save_format gdtr;
+ volatile struct GDT_slot Gdt_slot;
+ volatile struct GDT_slot *gdt_slot = &Gdt_slot;
+ unsigned16 tmp_segment = 0;
+ unsigned32 limit_adjusted;
+
+
+ /* load physical address of the GDT */
+
+ get_GDTR( &gdtr );
+
+ gdt_slot->type_dt_dpl_p = 0x92; /* present, dpl=0, */
+ /* application=1, */
+ /* type=data read/write */
+ gdt_slot->limit_16_19_granularity = 0x40; /* 32 bit segment */
+
+ limit_adjusted = limit;
+ if ( limit > 4095 ) {
+ gdt_slot->limit_16_19_granularity |= 0x80; /* set granularity bit */
+ limit_adjusted /= 4096;
+ }
+
+ gdt_slot->limit_16_19_granularity |= (limit_adjusted >> 16) & 0xff;
+ gdt_slot->limit_0_15 = limit_adjusted & 0xffff;
+
+ gdt_slot->base_0_15 = base & 0xffff;
+ gdt_slot->base_16_23 = (base >> 16) & 0xff;
+ gdt_slot->base_24_31 = (base >> 24);
+
+ set_GDT_slot( gdtr.physical_address, segment, gdt_slot );
+
+ /* Now, reload all segment registers so the limit takes effect. */
+
+ asm volatile( "movw %%ds,%0 ; movw %0,%%ds
+ movw %%es,%0 ; movw %0,%%es
+ movw %%fs,%0 ; movw %0,%%fs
+ movw %%gs,%0 ; movw %0,%%gs
+ movw %%ss,%0 ; movw %0,%%ss"
+ : "=r" (tmp_segment)
+ : "0" (tmp_segment)
+ );
+
+}
+
+#endif
+/* end of include file */
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