(2006-08-06) rescue-bootcd

extra/syslinux-3.09/com32/include/com32.h

@@ -0,0 +1,117 @@
+/* ----------------------------------------------------------------------- *
+ *   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 */