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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>
- #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; /* 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 *);
- } __com32;
-
- /*
- * System call macros
- */
- static inline void
- __intcall(uint8_t __i, const com32sys_t *__sr, com32sys_t *__dr)
- {
- __com32.cs_intcall(__i, __sr, __dr);
- }
-
- static inline void
- __farcall(uint16_t __es, uint16_t __eo,
- const com32sys_t *__sr, com32sys_t *__dr)
- {
- __com32.cs_farcall((__es << 16) + __eo, __sr, __dr);
- }
-
- /*
- * 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)(((uintptr_t)__p) >> 4);
- }
-
- static inline uint16_t OFFS(void *__p)
- {
- /* The double cast here is to shut up gcc */
- return (uint16_t)(uintptr_t)__p & 0x000F;
- }
-
- static inline void *MK_PTR(uint16_t __seg, uint16_t __offs)
- {
- return (void *)((__seg << 4) + __offs);
- }
-
- #endif /* _COM32_H */
-