1 files changed, 124 insertions, 0 deletions
diff --git a/src/arch/i386/include/realmode.h b/src/arch/i386/include/realmode.h
new file mode 100644
index 000000000..eca92b9b5
--- /dev/null
+++ b/src/arch/i386/include/realmode.h
@@ -0,0 +1,124 @@
+/* Real-mode interface
+ */
+
+#ifndef ASSEMBLY
+
+#include "etherboot.h"
+#include "segoff.h"
+
+typedef union {
+	struct {
+		union {
+			uint8_t l;
+			uint8_t byte;
+		};
+		uint8_t h;
+	} PACKED;
+	uint16_t word;
+} PACKED reg16_t;
+
+typedef union {
+	reg16_t w;
+	uint32_t dword;
+} PACKED reg32_t;
+
+/* Macros to help with defining inline real-mode trampoline fragments.
+ */
+#define RM_XSTR(x) #x	/* Macro hackery needed to stringify       */
+#define RM_STR(x) RM_XSTR(x)
+#define	RM_FRAGMENT(name, asm_code_str)		\
+	extern void name ( void );		\
+	extern void name ## _end (void);	\
+	__asm__(				\
+		".section \".text16\"\n\t"	\
+		".code16\n\t"			\
+		".arch i386\n\t"		\
+		".globl " #name " \n\t"		\
+		#name ":\n\t"			\
+		asm_code_str "\n\t"		\
+		".globl " #name "_end\n\t"	\
+		#name "_end:\n\t"		\
+		".code32\n\t"			\
+		".previous\n\t"			\
+	)
+
+#define FRAGMENT_SIZE(fragment) ( (size_t) ( ( (void*) fragment ## _end )\
+					     - ( (void*) (fragment) ) ) )
+
+/* Data structures in _prot_to_real and _real_to_prot.  These
+ * structures are accessed by assembly code as well as C code.
+ */
+typedef struct {
+	uint32_t esp;
+	uint16_t cs;
+	uint16_t ss;
+	uint32_t r2p_params;
+} PACKED prot_to_real_params_t;
+
+typedef struct {
+	uint32_t ret_addr;
+	uint32_t esp;
+	uint32_t ebx;
+	uint32_t esi;
+	uint32_t edi;
+	uint32_t ebp;
+	uint32_t out_stack;
+	uint32_t out_stack_len;
+} PACKED real_to_prot_params_t;
+
+/* Function prototypes: realmode.c
+ */
+#define real_call( fragment, in_stack, out_stack ) \
+	_real_call ( fragment, FRAGMENT_SIZE(fragment), \
+		     (void*)(in_stack), \
+		     ( (in_stack) == NULL ? 0 : sizeof(*(in_stack)) ), \
+		     (void*)(out_stack), \
+		     ( (out_stack) == NULL ? 0 : sizeof(*(out_stack)) ) )
+extern uint16_t _real_call ( void *fragment, int fragment_len,
+			     void *in_stack, int in_stack_len,
+			     void *out_stack, int out_stack_len );
+/* Function prototypes: realmode_asm.S
+ */
+extern void rm_callback_interface;
+extern uint16_t rm_callback_interface_size;
+extern uint32_t rm_etherboot_location;
+extern void _rm_in_call ( void );
+extern void _rm_in_call_far ( void );
+
+extern void _prot_to_real_prefix ( void );
+extern void _prot_to_real_prefix_end ( void );
+extern uint16_t prot_to_real_prefix_size;
+
+extern void _real_to_prot_suffix ( void );
+extern void _real_to_prot_suffix_end ( void );
+extern uint16_t real_to_prot_suffix_size;
+
+/* PXE assembler bits */
+extern void pxe_callback_interface;
+extern uint16_t pxe_callback_interface_size;
+extern void _pxe_in_call_far ( void );
+extern void _pxenv_in_call_far ( void );
+extern void _pxe_intercept_int1a ( void );
+extern segoff_t _pxe_intercepted_int1a;
+extern segoff_t _pxe_pxenv_location;
+
+/* Global variables
+ */
+extern uint32_t real_mode_stack;
+extern size_t real_mode_stack_size;
+extern int lock_real_mode_stack;
+
+
+/* Function prototypes from basemem.c
+ */
+#ifdef LINUXBIOS
+/* A silly hard code that let's the code compile and work. 
+ * When this becomes a problem feel free to implement
+ * something better.
+ */
+static inline void allot_real_mode_stack(void) { real_mode_stack = 0x7c00; } 
+#else
+void allot_real_mode_stack(void);
+#endif
+
+#endif /* ASSEMBLY */