1 files changed, 198 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/include/registers.h b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/registers.h
new file mode 100644
index 0000000..2839e2b
--- /dev/null
+++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/include/registers.h
@@ -0,0 +1,198 @@
+#ifndef REGISTERS_H
+#define REGISTERS_H
+
+/** @file
+ *
+ * i386 registers.
+ *
+ * This file defines data structures that allow easy access to i386
+ * register dumps.
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+#include <stdint.h>
+
+/**
+ * A 16-bit general register.
+ *
+ * This type encapsulates a 16-bit register such as %ax, %bx, %cx,
+ * %dx, %si, %di, %bp or %sp.
+ *
+ */
+typedef union {
+	struct {
+		union {
+			uint8_t l;
+			uint8_t byte;
+		};
+		uint8_t h;
+	} PACKED;
+	uint16_t word;
+} PACKED reg16_t;
+
+/**
+ * A 32-bit general register.
+ *
+ * This type encapsulates a 32-bit register such as %eax, %ebx, %ecx,
+ * %edx, %esi, %edi, %ebp or %esp.
+ *
+ */
+typedef union {
+	struct {
+		union {
+			uint8_t l;
+			uint8_t byte;
+		};
+		uint8_t h;
+	} PACKED;
+	uint16_t word;
+	uint32_t dword;
+} PACKED reg32_t;
+
+/**
+ * A 32-bit general register dump.
+ *
+ * This is the data structure that is created on the stack by the @c
+ * pushal instruction, and can be read back using the @c popal
+ * instruction.
+ *
+ */
+struct i386_regs {
+	union {
+		uint16_t di;
+		uint32_t edi;
+	};
+	union {
+		uint16_t si;
+		uint32_t esi;
+	};
+	union {
+		uint16_t bp;
+		uint32_t ebp;
+	};
+	union {
+		uint16_t sp;
+		uint32_t esp;
+	};
+	union {
+		struct {
+			uint8_t bl;
+			uint8_t bh;
+		} PACKED;
+		uint16_t bx;
+		uint32_t ebx;
+	};
+	union {
+		struct {
+			uint8_t dl;
+			uint8_t dh;
+		} PACKED;
+		uint16_t dx;
+		uint32_t edx;
+	};
+	union {
+		struct {
+			uint8_t cl;
+			uint8_t ch;
+		} PACKED;
+		uint16_t cx;
+		uint32_t ecx;
+	};
+	union {
+		struct {
+			uint8_t al;
+			uint8_t ah;
+		} PACKED;
+		uint16_t ax;
+		uint32_t eax;
+	};
+} PACKED;
+
+/**
+ * A segment register dump.
+ *
+ * The i386 has no equivalent of the @c pushal or @c popal
+ * instructions for the segment registers.  We adopt the convention of
+ * always using the sequences
+ *
+ * @code
+ *
+ *   pushw %gs ; pushw %fs ; pushw %es ; pushw %ds ; pushw %ss ; pushw %cs
+ *
+ * @endcode
+ *
+ * and
+ *
+ * @code
+ *
+ *   addw $4, %sp ; popw %ds ; popw %es ; popw %fs ; popw %gs
+ *
+ * @endcode
+ *
+ * This is the data structure that is created and read back by these
+ * instruction sequences.
+ *
+ */
+struct i386_seg_regs {
+	uint16_t cs;
+	uint16_t ss;
+	uint16_t ds;
+	uint16_t es;
+	uint16_t fs;
+	uint16_t gs;
+} PACKED;
+
+/**
+ * A full register dump.
+ *
+ * This data structure is created by the instructions
+ *
+ * @code
+ *
+ *   pushfl
+ *   pushal
+ *   pushw %gs ; pushw %fs ; pushw %es ; pushw %ds ; pushw %ss ; pushw %cs
+ *
+ * @endcode
+ *
+ * and can be read back using the instructions
+ *
+ * @code
+ *
+ *   addw $4, %sp ; popw %ds ; popw %es ; popw %fs ; popw %gs
+ *   popal
+ *   popfl
+ *
+ * @endcode
+ *
+ * prot_call() and kir_call() create this data structure on the stack
+ * and pass in a pointer to this structure.
+ *
+ */
+struct i386_all_regs {
+	struct i386_seg_regs segs;
+	struct i386_regs regs;
+	uint32_t flags;
+} PACKED;
+
+/* Flags */
+#define CF ( 1 <<  0 )
+#define PF ( 1 <<  2 )
+#define AF ( 1 <<  4 )
+#define ZF ( 1 <<  6 )
+#define SF ( 1 <<  7 )
+#define OF ( 1 << 11 )
+
+/* Segment:offset structure.  Note that the order within the structure
+ * is offset:segment.
+ */
+struct segoff {
+	uint16_t offset;
+	uint16_t segment;
+} PACKED;
+
+typedef struct segoff segoff_t;
+
+#endif /* REGISTERS_H */