1ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 2ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <stdio.h> 3ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#include <config.h> 4ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 5ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic 6ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint try_mtocrf ( int x ) 7ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 8ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int base = 0x31415927; 9ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int res; 10ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef HAVE_AS_PPC_MFTOCRF 11ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* pre-set CR */ 12ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown __asm__ __volatile__( 13ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "mtcr %0" 14ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown : /*w*/ : /*r*/ "b"(base) : /*trash*/"cc" ); 15ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 16ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* do it */ 17ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown __asm__ __volatile__( 18ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "mtocrf 4, %0" 19ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown : /*w*/ : /*r*/ "b"(x) : /*trash*/"cc" ); 20ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 21ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* get CR */ 22ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown __asm__ __volatile__( 23ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "mfcr %0" 24ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown : /*w*/"=b"(res) : /*r*/ ); 25ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#else 26ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = 42; 27ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 28ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return res; 29ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 30ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 31ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownstatic 32ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint try_mfocrf ( int x ) 33ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 34ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int res; 35ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#ifdef HAVE_AS_PPC_MFTOCRF 36ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* CR = x */ 37ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown __asm__ __volatile__( 38ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "mtcr %0" 39ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown : /*w*/ : /*r*/ "b"(x) : /*trash*/"cc" ); 40ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 41ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown /* do it */ 42ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown __asm__ __volatile__( 43ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "li %0,0\n\t" 44ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown "mfocrf %0,64" 45ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown : /*w*/"=b"(res) : /*r*/ ); 46ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#else 47ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown res = 42; 48ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown#endif 49ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return res; 50ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 51ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 52ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown/* This is a bit of a kludge since mfocrf reads the spec'd CR field, 53ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown but the remaining returned bits are undefined. It seems like on 54ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown MPC7447A (Apple Mac Mini) mfocrf just reads the entire CR, which is 55ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown an acceptable implementation, but is not necessarily what other 56ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown implementations are going to do. */ 57ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 58ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brownint main ( void ) 59ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown{ 60ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown int i, j; 61ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown for (i = 0; i < 32; i++) { 62ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("0x%08x\n", try_mtocrf( 1<<i )); 63ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 64ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("\n"); 65ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown j = 1; 66ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown for (i = 0; i < 32; i++) { 67ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown printf("0x%08x\n", try_mfocrf( j )); 68ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown j *= 3; 69ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown } 70ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown 71ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown return 0; 72ed07e00d438c74b7a23c01bfffde77e3968305e4Jeff Brown} 73