Real mode interrupt call implementation. More...

#include <bsp/realmode_int.h>
#include <string.h>
#include <rtems/score/cpu.h>

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

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

Macros
#define	IR_EAX_OFF "0x00"

#define	IR_EBX_OFF "0x04"

#define	IR_ECX_OFF "0x08"

#define	IR_EDX_OFF "0x0C"

#define	IR_ESI_OFF "0x10"

#define	IR_EDI_OFF "0x14"

#define	IR_DS_OFF "0x18"

#define	IR_ES_OFF "0x1A"

#define	IR_FS_OFF "0x1C"

#define	IR_GS_OFF "0x1E"

#define	BKP_ESP_OFF "0x20"

#define	BKP_SS_OFF "0x24"

#define	BKP_DS_OFF "0x26"

#define	RM_ENTRY "0x28"

#define	PM_ENTRY "0x2C"

#define	BKP_IDTR_LIM "0x00"

#define	BKP_IDTR_BASE "0x02"

#define	BKP_ES_OFF "0x06"

#define	BKP_FS_OFF "0x08"

#define	BKP_GS_OFF "0x0A"

#define	RML_ENTRY "0x0C"

#define	RML_D_SEL "0x12"

#define	RM_SS "0x14"

#define	RM_SP "0x16"

#define	RM_DS "0x18"

#define	REAL_MODE_SPOT 0x12000

#define	DEFAULT_BUFFER_SIZE 512

#define	STACK_SIZE 8192

#define	INT_STACK_TOP REAL_MODE_SPOT

#define	__DP_TYPE uint8_t

#define	__DP_YES ((__DP_TYPE)1)

#define	__DP_NO ((__DP_TYPE)-1)

#define	__DP_FAIL ((__DP_TYPE)0)

#define	rml_limit 0xFFFF

Functions
void *	i386_get_default_rm_buffer (uint16_t *size)
	Returns buffer and its size usable with real mode interrupt call. More...

int	i386_real_interrupt_call (uint8_t interrupt_number, i386_realmode_interrupt_registers *ir)
	Call to real mode interrupt with specified int NO and processor registers. More...

Detailed Description

Real mode interrupt call implementation.

Function Documentation

◆ i386_get_default_rm_buffer()

void* i386_get_default_rm_buffer ( uint16_t * size )

Returns buffer and its size usable with real mode interrupt call.

Provides position to real mode buffer. It is buffer accessible from real mode context - it is located below address ~0x100000 in order for it to be accessible This buffer is meant to be pointed to by segReg:GenPurpReg and through this get bigger portion of an information to/from interrupt service routine than just by using register.

Parameters

[out] size pointer to variable, where the size of buffer will be filled

Return values

pointer to buffer

◆ i386_real_interrupt_call()

int i386_real_interrupt_call	(	uint8_t	interrupt_number,
		i386_realmode_interrupt_registers *	ir
	)

Call to real mode interrupt with specified int NO and processor registers.

This function allows calling interrupts in real mode and to set processor registers as desired before interrupt call is made and to retrieve the registers content after call was made.

Parameters

[in]	interrupt_number	interrupt number to be called
[in]	ir	pointer to structure containing registers to be passed to interrupt and to retrieve register content after call was made.

Return values

0	call failed (GDT too small or pagin is on)
1	call successful

Data Structures

Macros

Functions

Detailed Description

Function Documentation

◆ i386_get_default_rm_buffer()

◆ i386_real_interrupt_call()