x86: Forward declare gd_t

So it can be used as a type in struct global_data and remove an ugly typecast

Signed-off-by: Graeme Russ <graeme.russ@gmail.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Marek Vasut <marex@denx.de>

arch/x86/cpu/cpu.c

@@ -92,7 +92,7 @@ static void load_gdt(const u64 *boot_gdt, u16 num_entries)
 
 void init_gd(gd_t *id, u64 *gdt_addr)
 {
-	id->gd_addr = (ulong)id;
+	id->gd_addr = id;
 	setup_gdt(id, gdt_addr);
 }
 

arch/x86/include/asm/global_data.h

@@ -33,9 +33,11 @@
 
 #ifndef __ASSEMBLY__
 
-typedef	struct global_data {
+typedef struct global_data gd_t;
+
+struct global_data {
 	/* NOTE: gd_addr MUST be first member of struct global_data! */
-	unsigned long	gd_addr;	/* Location of Global Data */
+	gd_t *gd_addr;	/* Location of Global Data */
 	bd_t		*bd;
 	unsigned long	flags;
 	unsigned int	baudrate;
@@ -57,7 +59,7 @@ typedef	struct global_data {
 	unsigned long	reset_status;	/* reset status register at boot */
 	void		**jt;		/* jump table */
 	char		env_buf[32];	/* buffer for getenv() before reloc. */
-} gd_t;
+};
 
 static inline gd_t *get_fs_gd_ptr(void)
 {

arch/x86/lib/init_helpers.c

@@ -126,7 +126,7 @@ int copy_gd_to_ram_f_r(void)
 	 * in-RAM copy of Global Data (calculate_relocation_address()
 	 * has already calculated the in-RAM location of the GDT)
 	 */
-	ram_gd->gd_addr = (ulong)ram_gd;
+	ram_gd->gd_addr = ram_gd;
 	init_gd(ram_gd, (u64 *)gd->gdt_addr);
 
 	return 0;