ref: f5cc6fbe3a7bcf8bdb002c646ddd519014afafd2
dir: /os/boot/mpc/squeeze.h/
/*
* 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));\
}