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/* ----------------------------------------------------------------------- *
* Not Copyright 2002 H. Peter Anvin
* This file is in the public domain.
* ----------------------------------------------------------------------- */
/*
* com32.h
*
* Common declarations for com32 programs.
*/
#ifndef _COM32_H
#define _COM32_H
#include <stdint.h>
/*
* This structure defines the register frame used by the
* system call interface.
*
* The syscall interface is:
*
* __syscall(<interrupt #>, <source regs>, <return regs>)
*/
typedef union {
uint32_t l;
uint16_t w[2];
uint8_t b[4];
} reg32_t;
typedef struct {
uint16_t gs; /* Offset 0 */
uint16_t fs; /* Offset 2 */
uint16_t es; /* Offset 4 */
uint16_t ds; /* Offset 6 */
reg32_t edi; /* Offset 8 */
reg32_t esi; /* Offset 12 */
reg32_t ebp; /* Offset 16 */
reg32_t _unused; /* Offset 20 */
reg32_t ebx; /* Offset 24 */
reg32_t edx; /* Offset 28 */
reg32_t ecx; /* Offset 32 */
reg32_t eax; /* Offset 36 */
reg32_t eflags; /* Offset 40 */
} com32sys_t;
extern struct com32_sys_args {
uint32_t cs_sysargs;
char *cs_cmdline;
void (*cs_intcall)(uint8_t, com32sys_t *, com32sys_t *);
void *cs_bounce;
uint32_t cs_bounce_size;
void (*cs_farcall)(uint32_t, com32sys_t *, com32sys_t *);
} __com32;
/*
* These functions convert between linear pointers in the range
* 0..0xFFFFF and real-mode style SEG:OFFS pointers. Note that a
* 32-bit linear pointer is not compatible with a SEG:OFFS pointer
* stored in two consecutive 16-bit words.
*/
static inline uint16_t SEG(void *__p)
{
return (uint16_t)(((uint32_t)__p) >> 4);
}
static inline uint16_t OFFS(void *__p)
{
/* The double cast here is to shut up gcc */
return (uint16_t)(uint32_t)__p & 0x000F;
}
static inline void *MK_PTR(uint16_t __seg, uint16_t __offs)
{
return (void *)( ((uint32_t)__seg << 4) + (uint32_t)__offs );
}
#endif /* _COM32_H */
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