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/****************************************************************************
* YABEL BIOS Emulator
*
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Copyright (c) 2008 Pattrick Hueper <phueper@hueper.net>
****************************************************************************/
#ifndef _YABEL_PMM_H_
#define _YABEL_PMM_H_
#include <types.h>
/* PMM Structure see PMM Spec Version 1.01 Chapter 3.1.1
* (search web for specspmm101.pdf)
*/
typedef struct {
u8 signature[4];
u8 struct_rev;
u8 length;
u8 checksum;
u32 entry_point_offset;
u8 reserved[5];
/* Code is not part of the specced PMM struct, however, since I cannot
* put the handling of PMM in the virtual memory (I don't want to hack
* it together in x86 assembly ;-)) this code array is pointed to by
* entry_point_offset, in code there is only a INT call and a RETF,
* thus every PMM call will issue a PMM INT (only defined in YABEL,
* see interrupt.c) and the INT Handler will do the actual PMM work.
*/
u8 code[3];
} __attribute__ ((__packed__)) pmm_information_t;
/* This function is used to setup the PMM struct in virtual memory
* at a certain offset */
u8 pmm_setup(u16 segment, u16 offset);
/* This is the INT Handler mentioned above, called by my special PMM INT. */
void pmm_handleInt(void);
void pmm_test(void);
#endif /* _YABEL_PMM_H_ */
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