118 lines
2.8 KiB
C
118 lines
2.8 KiB
C
/* ----------------------------------------------------------------------- *
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* Not Copyright 2002 H. Peter Anvin
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* This file is in the public domain.
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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 <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; /* 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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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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} __com32;
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/*
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* System call macros
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*/
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static inline void
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__intcall(uint8_t __i, const com32sys_t *__sr, com32sys_t *__dr)
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{
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__com32.cs_intcall(__i, __sr, __dr);
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}
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static inline void
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__farcall(uint16_t __es, uint16_t __eo,
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const com32sys_t *__sr, com32sys_t *__dr)
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{
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__com32.cs_farcall((__es << 16) + __eo, __sr, __dr);
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}
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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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static inline uint16_t SEG(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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static inline uint16_t OFFS(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 void *MK_PTR(uint16_t __seg, uint16_t __offs)
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{
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return (void *)((__seg << 4) + __offs);
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}
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#endif /* _COM32_H */
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