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Diffstat (limited to 'contrib/syslinux-4.02/com32/include/com32.h')
| -rw-r--r-- | contrib/syslinux-4.02/com32/include/com32.h | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/com32/include/com32.h b/contrib/syslinux-4.02/com32/include/com32.h new file mode 100644 index 0000000..6b14208 --- /dev/null +++ b/contrib/syslinux-4.02/com32/include/com32.h @@ -0,0 +1,197 @@ +/* ----------------------------------------------------------------------- * + * + * 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. + */ +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)); +} + +#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 *)((__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; +} + +#endif /* _COM32_H */ |