Intel I386 CPU Dependent Source. More...

#include <rtems/score/interrupts.h>
#include <rtems/score/registers.h>
#include <rtems/score/idtr.h>

Data Structures
struct	__rtems_raw_irq_connect_data__

struct	rtems_raw_irq_global_settings

struct	RTEMS_PACKED
	Used for passing and retrieving registers content to/from real mode interrupt call. More...

struct	la_bits

union	linear_address

struct	page_dir_bits

union	page_dir_entry

struct	page_table_bits

union	page_table_entry

struct	page_directory

struct	page_table

Macros
#define	I386_HAS_FPU 1

#define	I386_HAS_BSWAP 1

#define	CPU_NAME "Intel i386"

#define	CPU_swap_u32(_value) i386_swap_u32( _value )

#define	CPU_swap_u16(_value) i386_swap_u16( _value )

#define	i386_outport_byte(_port, _value)

#define	i386_outport_word(_port, _value)

#define	i386_outport_long(_port, _value)

#define	i386_inport_byte(_port, _value)

#define	i386_inport_word(_port, _value)

#define	i386_inport_long(_port, _value)

#define	PG_SIZE 0x1000

#define	MASK_OFFSET 0xFFF

#define	MAX_ENTRY (PG_SIZE/sizeof(page_dir_entry))

#define	FOUR_MB 0x400000

#define	MASK_FLAGS 0x1A

#define	PTE_PRESENT 0x01

#define	PTE_WRITABLE 0x02

#define	PTE_USER 0x04

#define	PTE_WRITE_THROUGH 0x08

#define	PTE_CACHE_DISABLE 0x10

#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 )

Typedefs
typedef unsigned char	rtems_vector_offset

typedef struct __rtems_raw_irq_connect_data__	rtems_raw_irq_connect_data

Functions
void *	i386_Logical_to_physical (unsigned short segment, void *address)

void *	i386_Physical_to_logical (unsigned short segment, void *address)

int	i386_Physical_to_real (void address, uint16_t segment, uint16_t *offset)
	Retrieves real mode pointer elements {segmnet, offset} from physical address.

rtems_raw_irq_hdl	get_hdl_from_vector (rtems_vector_offset)

int	i386_set_idt_entry (const rtems_raw_irq_connect_data *)

int	i386_get_current_idt_entry (rtems_raw_irq_connect_data *)

int	i386_delete_idt_entry (const rtems_raw_irq_connect_data *)

int	i386_init_idt (rtems_raw_irq_global_settings *config)

int	i386_get_idt_config (rtems_raw_irq_global_settings **config)

void	i386_get_info_from_GDTR (segment_descriptors *table, uint16_t limit)

void	i386_set_GDTR (segment_descriptors *, uint16_t limit)

uint32_t	i386_raw_gdt_entry (uint16_t segment_selector_index, segment_descriptors *sd)
	Allows to set a GDT entry.

void	i386_fill_segment_desc_base (uint32_t base, segment_descriptors *sd)
	fills `sd` with provided `base` in appropriate fields of `sd`

void	i386_fill_segment_desc_limit (uint32_t limit, segment_descriptors *sd)
	fills `sd` with provided `limit` in appropriate fields of `sd`

uint32_t	i386_set_gdt_entry (uint16_t segment_selector, uint32_t base, uint32_t limit)

uint16_t	i386_next_empty_gdt_entry (void)
	Returns next empty descriptor in GDT.

uint16_t	i386_cpy_gdt_entry (uint16_t segment_selector, segment_descriptors *struct_to_fill)
	Copies GDT entry at index `segment_selector` to structure pointed to by `struct_to_fill`.

segment_descriptors *	i386_get_gdt_entry (uint16_t sgmnt_selector)
	Returns pointer to GDT table at index given by `segment_selector`.

uint32_t	i386_limit_gdt_entry (segment_descriptors *gdt_entry)
	Extracts limit in bytes from GDT entry pointed to by `gdt_entry`.

Detailed Description

Intel I386 CPU Dependent Source.

Macro Definition Documentation

◆ i386_inport_byte

#define i386_inport_byte	(	_port,
		_value
	)

Value:

do { unsigned short __port  = _port; \
     unsigned char  __value = 0; \
     \
     __asm__ volatile ( "inb %1,%0" : "=a" (__value) \
                                : "d"  (__port) \
                  ); \
     _value = __value; \
   } while (0)

◆ i386_inport_long

#define i386_inport_long	(	_port,
		_value
	)

Value:

do { unsigned short __port  = _port; \
     unsigned int  __value = 0; \
     \
     __asm__ volatile ( "inl %1,%0" : "=a" (__value) \
                                : "d"  (__port) \
                  ); \
     _value = __value; \
   } while (0)

◆ i386_inport_word

#define i386_inport_word	(	_port,
		_value
	)

Value:

do { unsigned short __port  = _port; \
     unsigned short __value = 0; \
     \
     __asm__ volatile ( "inw %1,%0" : "=a" (__value) \
                                : "d"  (__port) \
                  ); \
     _value = __value; \
   } while (0)

◆ i386_outport_byte

#define i386_outport_byte	(	_port,
		_value
	)

Value:

do { unsigned short __port  = _port; \
     unsigned char  __value = _value; \
     \
     __asm__ volatile ( "outb %0,%1" : : "a" (__value), "d" (__port) ); \
   } while (0)

◆ i386_outport_long

#define i386_outport_long	(	_port,
		_value
	)

Value:

do { unsigned short __port  = _port; \
     unsigned int  __value = _value; \
     \
     __asm__ volatile ( "outl %0,%1" : : "a" (__value), "d" (__port) ); \
   } while (0)

◆ i386_outport_word

#define i386_outport_word	(	_port,
		_value
	)

Value:

do { unsigned short __port  = _port; \
     unsigned short __value = _value; \
     \
     __asm__ volatile ( "outw %0,%1" : : "a" (__value), "d" (__port) ); \
   } while (0)

Function Documentation

◆ i386_cpy_gdt_entry()

uint16_t i386_cpy_gdt_entry	(	uint16_t	segment_selector,
		segment_descriptors *	struct_to_fill
	)

Copies GDT entry at index segment_selector to structure pointed to by struct_to_fill.

Parameters

[in]	segment_selector	index to GDT table specifying descriptor to copy
[out]	struct_to_fill	pointer to memory where will be descriptor coppied

Return values

0	FAILED segment_selector out of GDT range
<1;65535>	retrieved segment_selector

◆ i386_fill_segment_desc_base()

void i386_fill_segment_desc_base	(	uint32_t	base,
		segment_descriptors *	sd
	)

fills sd with provided base in appropriate fields of sd

Parameters

[in]	base	32-bit address to be set as descriptor's base
[out]	sd	descriptor being filled with `base`

◆ i386_fill_segment_desc_limit()

void i386_fill_segment_desc_limit	(	uint32_t	limit,
		segment_descriptors *	sd
	)

fills sd with provided limit in appropriate fields of sd

sets granularity bit if necessary

Parameters

[in]	limit	32-bit value representing number of limit bytes
[out]	sd	descriptor being filled with `limit`

◆ i386_get_gdt_entry()

segment_descriptors * i386_get_gdt_entry ( uint16_t sgmnt_selector )

Returns pointer to GDT table at index given by segment_selector.

Parameters

[in] sgmnt_selector index to GDT table for specifying descriptor to get

Return values

NULL	FAILED segment_selector out of GDT range
pointer	to GDT table at `segment_selector`

◆ i386_limit_gdt_entry()

uint32_t i386_limit_gdt_entry ( segment_descriptors * gdt_entry )

Extracts limit in bytes from GDT entry pointed to by gdt_entry.

Parameters

[in] gdt_entry pointer to entry from which limit should be retrieved

Return values

limit value in bytes from GDT entry

◆ i386_next_empty_gdt_entry()

uint16_t i386_next_empty_gdt_entry ( void )

Returns next empty descriptor in GDT.

Number of descriptors that can be returned depends on GDT_SIZE

Return values

0	FAILED GDT is full
<1;65535>	segment_selector number as index to GDT

◆ i386_Physical_to_real()

int i386_Physical_to_real	(	void *	address,
		uint16_t *	segment,
		uint16_t *	offset
	)

Retrieves real mode pointer elements {segmnet, offset} from physical address.

i386_Physical_to_real Function returns the highest segment (base) address possible. Example: input address - 0x4B3A2 output segment - 0x4B3A offset - 0x2 input address - 0x10F12E output segment - 0xFFFF offset - 0xF13E

Parameters

[in]	address	address to be converted, must be less than 0x10FFEF
[out]	segment	segment computed from `address`
[out]	offset	offset computed from `address`

Return values

0	address not convertible
1	segment and offset extracted

◆ i386_raw_gdt_entry()

uint32_t i386_raw_gdt_entry	(	uint16_t	segment_selector_index,
		segment_descriptors *	sd
	)

Allows to set a GDT entry.

Puts global descriptor sd to the global descriptor table on index segment_selector_index

Parameters

[in]	segment_selector_index	index to GDT entry
[in]	sd	structure to be coppied to given `segment_selector` in GDT

Return values

0	FAILED out of GDT range or index is 0, which is not valid index in GDT
1	SUCCESS

Data Structures

Macros

Typedefs

Functions

Detailed Description

Macro Definition Documentation

◆ i386_inport_byte

◆ i386_inport_long

◆ i386_inport_word

◆ i386_outport_byte

◆ i386_outport_long

◆ i386_outport_word

Function Documentation

◆ i386_cpy_gdt_entry()

◆ i386_fill_segment_desc_base()

◆ i386_fill_segment_desc_limit()

◆ i386_get_gdt_entry()

◆ i386_limit_gdt_entry()

◆ i386_next_empty_gdt_entry()

◆ i386_Physical_to_real()

◆ i386_raw_gdt_entry()