[OpenBIOS] [PATCH] libopenbios: add Forth LE memory access words

[Mark Cave-Ayland]

These are particularly useful when accessing hardware registers from BE hosts.

Signed-off-by: Mark Cave-Ayland 
---
 libopenbios/init.c |   50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/libopenbios/init.c b/libopenbios/init.c
index aa99608..3ad9505 100644
--- a/libopenbios/init.c
+++ b/libopenbios/init.c
@@ -15,12 +15,56 @@
  */

#include "config.h"
+#include "libc/byteorder.h"
 #include "libopenbios/openbios.h"
 #include "libopenbios/bindings.h"
 #include "libopenbios/initprogram.h"
 #define NO_QEMU_PROTOS
 #include "arch/common/fw_cfg.h"

+
+/*
+ *  le-w!          ( w waddr -- )
+ */
+
+static void lewstore(void)
+{
+	u16 *aaddr = (u16 *)cell2pointer(POP());
+	const u16 word = POP();
+	*aaddr = __cpu_to_le16(word);
+}
+
+/*
+ *  le-l!          ( quad qaddr -- )
+ */
+
+static void lelstore(void)
+{
+	u32 *aaddr = (u32 *)cell2pointer(POP());
+	const u32 longval = POP();
+	*aaddr = __cpu_to_le32(longval);
+}
+
+/*
+ *  le-w@          ( waddr -- w )
+ */
+
+static void lewfetch(void)
+{
+	const u16 *aaddr = (u16 *)cell2pointer(POP());
+	PUSH(__le16_to_cpu(*aaddr));
+}
+
+/*
+ *  le-l@          ( qaddr -- quad )
+ */
+
+static void lelfetch(void)
+{
+	const u32 *aaddr = (u32 *)cell2pointer(POP());
+	PUSH(__le32_to_cpu(*aaddr));
+}
+
 void
 openbios_init( void )
 {
@@ -36,4 +80,10 @@ openbios_init( void )
    
    // Bind the C implementation of (go) into Forth
    bind_func("(go)", go);
+	
+	// Bind the LE access words
+	bind_func("le-w!", lewstore);
+	bind_func("le-l!", lelstore);
+	bind_func("le-w@", lewfetch);
+	bind_func("le-l@", lelfetch);
 }