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/**
* @file
*
* @ingroup i386_shared
*
* @brief Definitioins supporting real mode interrupt calls.
*
* Interface allows calling given interrupt number with content of the
* registers defined. For passing or receiving higher amounts of the data
* there is a buffer accessible from real mode available. Real mode pointer
* to this buffer is passed to the interrupt in the registers.
*/
/*
* Copyright (C) 2014 Jan Doležal (dolezj21@fel.cvut.cz)
* CTU in Prague.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#ifndef _REALMODE_INT_H
#define _REALMODE_INT_H
#include <rtems/score/cpu.h>
#include <stdint.h>
#ifndef ASM /* ASM */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/* --- BIOS service interrupt number --- */
/* number of interrupt servicing video functions */
#define INTERRUPT_NO_VIDEO_SERVICES 0x10
/**
* @brief Used for passing and retrieving registers content to/from real mode
* interrupt call.
*/
typedef struct {
uint32_t reg_eax;
uint32_t reg_ebx;
uint32_t reg_ecx;
uint32_t reg_edx;
uint32_t reg_esi;
uint32_t reg_edi;
uint16_t reg_ds;
uint16_t reg_es;
uint16_t reg_fs;
uint16_t reg_gs;
} RTEMS_PACKED i386_realmode_interrupt_registers;
/**
* @brief 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.
*
* @param[out] size pointer to variable, where the size of buffer
* will be filled
* @retval pointer to buffer
*/
extern void *i386_get_default_rm_buffer(uint16_t *size);
/**
* @brief 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.
*
* @param[in] interrupt_number interrupt number to be called
* @param[in] ir pointer to structure containing registers to be passed to
* interrupt and to retrieve register content after call was made.
* @retval 0 call failed (GDT too small or pagin is on)
* @retval 1 call successful
*/
extern int i386_real_interrupt_call(
uint8_t interrupt_number,
i386_realmode_interrupt_registers *ir
);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* ASM */
#endif /* _REALMODE_INT_H */
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