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/* ----------------------------------------------------------------------- *
*
* Copyright 2002-2009 H. Peter Anvin - All Rights Reserved
* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* com32.h
*
* Common declarations for com32 programs.
*/
#ifndef _COM32_H
#define _COM32_H
#include <stdint.h>
#include <stdbool.h>
#include <stddef.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
struct com32_pmapi;
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);
uint32_t cs_memsize;
const char *cs_name;
const struct com32_pmapi *cs_pm;
} __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;
/*
* Lowmem allocation functions
*/
void *lmalloc(size_t);
void *lzalloc(size_t);
void lfree(void *);
char *lstrdup(const char *);
/*
* 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.
*/
#if defined(CORE_DEBUG) && (defined(__COM32__) || defined(__SYSLINUX_CORE__))
__noreturn __bad_SEG(const volatile void *);
static inline uint16_t SEG(const volatile void *__p)
{
if (__unlikely((uintptr_t)__p > 0xfffff))
__bad_SEG(__p);
return (uint16_t) (((uintptr_t) __p) >> 4);
}
#else
static inline uint16_t SEG(const volatile void *__p)
{
return (uint16_t) (((uintptr_t) __p) >> 4);
}
#endif
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));
}
#define OFFS_VALID(p,s) _OFFS_VALID((p), sizeof *(p), (s))
static inline bool _OFFS_VALID(const volatile void *__p, size_t __s,
uint16_t __seg)
{
uintptr_t __segstart = (uintptr_t)__seg << 4;
uintptr_t __offs = (uintptr_t)__p - __segstart;
return __offs <= 0x10000-__s;
}
static inline void *MK_PTR(uint16_t __seg, uint16_t __offs)
{
return (void *)(unsigned long)((__seg << 4) + __offs);
}
/* Some tools to handle 16:16 far pointers in memory */
struct __far_ptr {
union {
uint32_t ptr;
struct {
uint16_t offs, seg;
};
};
} __attribute__ ((packed));
typedef struct __far_ptr far_ptr_t;
static inline void *GET_PTR(far_ptr_t __fptr)
{
return MK_PTR(__fptr.seg, __fptr.offs);
}
static inline far_ptr_t FAR_PTR(void *__ptr)
{
far_ptr_t __fptr;
__fptr.offs = OFFS(__ptr);
__fptr.seg = SEG(__ptr);
return __fptr;
}
extern const char *com32_cmdline(void);
#endif /* _COM32_H */
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