212 lines
5.9 KiB
C
212 lines
5.9 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2002-2009 H. Peter Anvin - All Rights Reserved
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* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* com32.h
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*
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* Common declarations for com32 programs.
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*/
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#ifndef _COM32_H
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#define _COM32_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <klibc/compiler.h> /* For __cdecl */
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/*
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* This structure defines the register frame used by the
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* system call interface.
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*
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* The syscall interface is:
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*
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* __intcall(interrupt_#, source_regs, return_regs)
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* __farcall(seg, offs, source_regs, return_regs)
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*/
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typedef union {
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uint32_t l;
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uint16_t w[2];
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uint8_t b[4];
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} reg32_t;
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typedef struct {
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uint16_t gs; /* Offset 0 */
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uint16_t fs; /* Offset 2 */
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uint16_t es; /* Offset 4 */
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uint16_t ds; /* Offset 6 */
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reg32_t edi; /* Offset 8 */
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reg32_t esi; /* Offset 12 */
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reg32_t ebp; /* Offset 16 */
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reg32_t _unused_esp; /* Offset 20 */
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reg32_t ebx; /* Offset 24 */
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reg32_t edx; /* Offset 28 */
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reg32_t ecx; /* Offset 32 */
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reg32_t eax; /* Offset 36 */
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reg32_t eflags; /* Offset 40 */
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} com32sys_t;
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/* EFLAGS definitions */
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#define EFLAGS_CF 0x00000001
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#define EFLAGS_PF 0x00000004
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#define EFLAGS_AF 0x00000010
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#define EFLAGS_ZF 0x00000040
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#define EFLAGS_SF 0x00000080
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#define EFLAGS_TF 0x00000100
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#define EFLAGS_IF 0x00000200
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#define EFLAGS_DF 0x00000400
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#define EFLAGS_OF 0x00000800
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#define EFLAGS_IOPL 0x00003000
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#define EFLAGS_NT 0x00004000
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#define EFLAGS_RF 0x00010000
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#define EFLAGS_VM 0x00020000
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#define EFLAGS_AC 0x00040000
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#define EFLAGS_VIF 0x00080000
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#define EFLAGS_VIP 0x00100000
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#define EFLAGS_ID 0x00200000
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struct com32_pmapi;
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extern struct com32_sys_args {
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uint32_t cs_sysargs;
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char *cs_cmdline;
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void __cdecl (*cs_intcall)(uint8_t, const com32sys_t *, com32sys_t *);
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void *cs_bounce;
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uint32_t cs_bounce_size;
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void __cdecl (*cs_farcall)(uint32_t, const com32sys_t *, com32sys_t *);
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int __cdecl (*cs_cfarcall)(uint32_t, const void *, uint32_t);
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uint32_t cs_memsize;
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const char *cs_name;
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const struct com32_pmapi *cs_pm;
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} __com32;
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/*
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* System call wrapper functions
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*/
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void __intcall(uint8_t __i, const com32sys_t * __sr, com32sys_t * __dr);
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void __farcall(uint16_t __cs, uint16_t __ip,
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const com32sys_t * __sr, com32sys_t * __dr);
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int __cfarcall(uint16_t __cs, uint16_t __ip,
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const void *__stack, uint32_t __stack_size);
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extern const com32sys_t __com32_zero_regs;
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/*
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* Lowmem allocation functions
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*/
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void *lmalloc(size_t);
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void *lzalloc(size_t);
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void lfree(void *);
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char *lstrdup(const char *);
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/*
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* These functions convert between linear pointers in the range
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* 0..0xFFFFF and real-mode style SEG:OFFS pointers. Note that a
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* 32-bit linear pointer is not compatible with a SEG:OFFS pointer
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* stored in two consecutive 16-bit words.
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*
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* Use OFFS_WRT() if you want to compute an offset relative to a
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* specific segment. OFFS_VALID() will return whether or not the
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* pointer is actually reachable from the target segment.
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*/
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#if defined(CORE_DEBUG) && (defined(__COM32__) || defined(__SYSLINUX_CORE__))
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__noreturn __bad_SEG(const volatile void *);
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static inline uint16_t SEG(const volatile void *__p)
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{
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if (__unlikely((uintptr_t)__p > 0xfffff))
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__bad_SEG(__p);
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return (uint16_t) (((uintptr_t) __p) >> 4);
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}
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#else
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static inline uint16_t SEG(const volatile void *__p)
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{
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return (uint16_t) (((uintptr_t) __p) >> 4);
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}
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#endif
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static inline uint16_t OFFS(const volatile void *__p)
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{
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/* The double cast here is to shut up gcc */
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return (uint16_t) (uintptr_t) __p & 0x000F;
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}
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static inline uint16_t OFFS_WRT(const volatile void *__p, uint16_t __seg)
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{
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return (uint16_t) ((uintptr_t) __p - ((uintptr_t) __seg << 4));
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}
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#define OFFS_VALID(p,s) _OFFS_VALID((p), sizeof *(p), (s))
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static inline bool _OFFS_VALID(const volatile void *__p, size_t __s,
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uint16_t __seg)
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{
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uintptr_t __segstart = (uintptr_t)__seg << 4;
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uintptr_t __offs = (uintptr_t)__p - __segstart;
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return __offs <= 0x10000-__s;
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}
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static inline void *MK_PTR(uint16_t __seg, uint16_t __offs)
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{
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return (void *)(unsigned long)((__seg << 4) + __offs);
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}
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/* Some tools to handle 16:16 far pointers in memory */
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struct __far_ptr {
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union {
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uint32_t ptr;
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struct {
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uint16_t offs, seg;
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};
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};
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} __attribute__ ((packed));
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typedef struct __far_ptr far_ptr_t;
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static inline void *GET_PTR(far_ptr_t __fptr)
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{
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return MK_PTR(__fptr.seg, __fptr.offs);
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}
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static inline far_ptr_t FAR_PTR(void *__ptr)
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{
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far_ptr_t __fptr;
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__fptr.offs = OFFS(__ptr);
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__fptr.seg = SEG(__ptr);
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return __fptr;
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}
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extern const char *com32_cmdline(void);
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#endif /* _COM32_H */
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