Create ptov() function.

Create a ptov() function. It's basically the same as the btx PTOV
macro, but works everywhere. smbios needs this to translate addresses,
but the translation differs between BIOS booting and EFI booting. Make
it a function so one smbios.o can be used everywhere. Provide
definitions for it in the two loaders affected.

Differential Revision: https://reviews.freebsd.org/D23660

stand/efi/loader/main.c

@@ -852,7 +852,11 @@ read_loader_env(const char *name, char *def_fn, bool once)
 	}
 }
 
-
+caddr_t
+ptov(uintptr_t x)
+{
+	return ((caddr_t)x);
+}
 
 EFI_STATUS
 main(int argc, CHAR16 *argv[])

stand/i386/libi386/smbios.c

@@ -28,16 +28,9 @@
 __FBSDID("$FreeBSD$");
 
 #include <stand.h>
-#include <bootstrap.h>
 #include <sys/endian.h>
 
-#ifdef EFI
-/* In EFI, we don't need PTOV(). */
-#define PTOV(x)		(caddr_t)(x)
-#else
-#include "btxv86.h"
-#endif
-#include "smbios.h"
+#define PTOV(x)		ptov(x)
 
 /*
  * Detect SMBIOS and export information about the SMBIOS into the

stand/i386/loader/main.c

@@ -86,6 +86,12 @@ extern char end[];
 static void *heap_top;
 static void *heap_bottom;
 
+caddr_t
+ptov(uintptr_t x)
+{
+	return (PTOV(x));
+}
+
 int
 main(void)
 {

stand/libsa/stand.h

@@ -452,4 +452,9 @@ const char *x86_hypervisor(void);
 #define reallocf(x, y)	Reallocf(x, y, NULL, 0)
 #endif
 
+/*
+ * va <-> pa routines. MD code must supply.
+ */
+caddr_t ptov(uintptr_t);
+
 #endif	/* STAND_H */