20060303

1 files changed, 34 insertions, 0 deletions

diff --git a/os/boot/mpc/squeeze.h b/os/boot/mpc/squeeze.h
new file mode 100644
index 00000000..b06c1b79
--- /dev/null
+++ b/os/boot/mpc/squeeze.h
@@ -0,0 +1,34 @@
+
+/*
+ * squeezed file format:
+ *	Sqhdr
+ *	original Exec header
+ *	two Squeeze tables
+ *	squeezed segment
+ *	unsqueezed segment, if any
+ */
+#define	SQMAGIC	(ulong)0xFEEF0F1E
+
+typedef struct Sqhdr Sqhdr;
+struct Sqhdr {
+	uchar	magic[4];	/* SQMAGIC */
+	uchar	text[4];	/* squeezed length of text (excluding tables) */
+	uchar	data[4];	/* squeezed length of data (excluding tables) */
+	uchar	asis[4];	/* length of unsqueezed segment */
+	uchar	toptxt[4];	/* value for 0 encoding in text */
+	uchar	topdat[4];	/* value for 0 encoding in data */
+	uchar	sum[4];	/* simple checksum of unsqueezed data */
+	uchar	flags[4];
+};
+#define	SQHDRLEN	(8*4)
+
+/*
+ * certain power instruction types are rearranged by sqz
+ * so as to move the variable part of the instruction word to the
+ * low order bits.  note that the mapping is its own inverse.
+ */
+#define	QREMAP(X)\
+	switch((X)>>26){\
+	case 19: case 31: case 59: case 63:\
+		(X) = (((X) & 0xFC00F801) | (((X)>>15)&0x7FE) | (((X)&0x7FE)<<15));\
+	}