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/* ----------------------------------------------------------------------- *
* Not Copyright 2002-2008 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>
#include <klibc/compiler.h> /* For __cdecl */
/*
* This structure defines the register frame used by the
* system call interface.
*
* The syscall interface is:
*
* __intcall(interrupt_#, source_regs, return_regs)
* __farcall(seg, offs, 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_esp; /* 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;
/* EFLAGS definitions */
#define EFLAGS_CF 0x00000001
#define EFLAGS_PF 0x00000004
#define EFLAGS_AF 0x00000010
#define EFLAGS_ZF 0x00000040
#define EFLAGS_SF 0x00000080
#define EFLAGS_TF 0x00000100
#define EFLAGS_IF 0x00000200
#define EFLAGS_DF 0x00000400
#define EFLAGS_OF 0x00000800
#define EFLAGS_IOPL 0x00003000
#define EFLAGS_NT 0x00004000
#define EFLAGS_RF 0x00010000
#define EFLAGS_VM 0x00020000
#define EFLAGS_AC 0x00040000
#define EFLAGS_VIF 0x00080000
#define EFLAGS_VIP 0x00100000
#define EFLAGS_ID 0x00200000
extern struct com32_sys_args {
uint32_t cs_sysargs;
char *cs_cmdline;
void __cdecl (*cs_intcall)(uint8_t, const com32sys_t *, com32sys_t *);
void *cs_bounce;
uint32_t cs_bounce_size;
void __cdecl (*cs_farcall)(uint32_t, const com32sys_t *, com32sys_t *);
int __cdecl (*cs_cfarcall)(uint32_t, const void *, uint32_t);
} __com32;
/*
* System call wrapper functions
*/
void __intcall(uint8_t __i, const com32sys_t *__sr, com32sys_t *__dr);
void __farcall(uint16_t __cs, uint16_t __ip,
const com32sys_t *__sr, com32sys_t *__dr);
int __cfarcall(uint16_t __cs, uint16_t __ip,
const void *__stack, uint32_t __stack_size);
extern const com32sys_t __com32_zero_regs;
/*
* 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.
*
* Use OFFS_WRT() if you want to compute an offset relative to a
* specific segment. OFFS_VALID() will return whether or not the
* pointer is actually reachable from the target segment.
*/
static inline uint16_t SEG(const volatile void *__p)
{
return (uint16_t)(((uintptr_t)__p) >> 4);
}
static inline uint16_t OFFS(const volatile void *__p)
{
/* The double cast here is to shut up gcc */
return (uint16_t)(uintptr_t)__p & 0x000F;
}
static inline uint16_t OFFS_WRT(const volatile void *__p, uint16_t seg)
{
return (uint16_t)((uintptr_t)__p - ((uintptr_t)seg << 4));
}
static inline int OFFS_VALID(const volatile void *__p, uint16_t seg)
{
uintptr_t __segstart = (uintptr_t)seg << 4;
uintptr_t __ptr = (uintptr_t)__p;
return (__ptr >= __segstart) && (__ptr <= __segstart+0xffff);
}
static inline void *MK_PTR(uint16_t __seg, uint16_t __offs)
{
return (void *)((__seg << 4) + __offs);
}
/* Some tools to handle 16:16 far pointers in memory */
struct __far_ptr {
uint32_t __ptr;
} __attribute__((packed));
typedef struct __far_ptr far_ptr_t;
static inline void *GET_PTR(far_ptr_t __fptr)
{
return MK_PTR(__fptr.__ptr >> 16, __fptr.__ptr);
}
static inline far_ptr_t FAR_PTR(void *__ptr)
{
far_ptr_t __fptr;
__fptr.__ptr = (SEG(__ptr) << 16) + OFFS(__ptr);
return __fptr;
}
#endif /* _COM32_H */
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