forked from Imagelibrary/rtems
98 lines
2.7 KiB
C
98 lines
2.7 KiB
C
/**
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* @file
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*
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* @ingroup RTEMSBSPsI386
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*
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* @brief Definitioins supporting real mode interrupt calls.
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*
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* Interface allows calling given interrupt number with content of the
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* registers defined. For passing or receiving higher amounts of the data
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* there is a buffer accessible from real mode available. Real mode pointer
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* to this buffer is passed to the interrupt in the registers.
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*/
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/*
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* Copyright (C) 2014 Jan Doležal (dolezj21@fel.cvut.cz)
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* CTU in Prague.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifndef _REALMODE_INT_H
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#define _REALMODE_INT_H
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#include <rtems/score/cpu.h>
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#include <stdint.h>
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#ifndef ASM /* ASM */
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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/* --- BIOS service interrupt number --- */
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/* number of interrupt servicing video functions */
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#define INTERRUPT_NO_VIDEO_SERVICES 0x10
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/**
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* @brief Used for passing and retrieving registers content to/from real mode
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* interrupt call.
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*/
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typedef struct {
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uint32_t reg_eax;
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uint32_t reg_ebx;
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uint32_t reg_ecx;
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uint32_t reg_edx;
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uint32_t reg_esi;
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uint32_t reg_edi;
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uint16_t reg_ds;
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uint16_t reg_es;
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uint16_t reg_fs;
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uint16_t reg_gs;
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} RTEMS_PACKED i386_realmode_interrupt_registers;
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/**
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* @brief Returns buffer and its size usable with real mode interrupt call.
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*
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* Provides position to real mode buffer. It is buffer
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* accessible from real mode context - it is located below
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* address ~0x100000 in order for it to be accessible
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* This buffer is meant to be pointed to by segReg:GenPurpReg
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* and through this get bigger portion of an information to/from
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* interrupt service routine than just by using register.
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*
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* @param[out] size pointer to variable, where the size of buffer
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* will be filled
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* @retval pointer to buffer
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*/
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extern void *i386_get_default_rm_buffer(uint16_t *size);
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/**
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* @brief Call to real mode interrupt with specified int NO and processor
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* registers.
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*
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* This function allows calling interrupts in real mode and to set processor
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* registers as desired before interrupt call is made and to retrieve the
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* registers content after call was made.
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*
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* @param[in] interrupt_number interrupt number to be called
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* @param[in] ir pointer to structure containing registers to be passed to
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* interrupt and to retrieve register content after call was made.
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* @retval 0 call failed (GDT too small or pagin is on)
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* @retval 1 call successful
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*/
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extern int i386_real_interrupt_call(
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uint8_t interrupt_number,
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i386_realmode_interrupt_registers *ir
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);
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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* ASM */
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#endif /* _REALMODE_INT_H */
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