/* * This file is subject to the terms and conditions of the GNU General Public * License.  See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 2013 Imagination Technologies Ltd. */ #include <linux/kernel.h>#include <linux/debugfs.h>#include <linux/seq_file.h>#include <asm/cpu.h>#include <asm/debug.h>#include <asm/mipsregs.h> static void build_segment_config(char *str, unsigned int cfg){	unsigned int am;	static const char * const am_str[] = {		"UK", "MK", "MSK", "MUSK", "MUSUK", "USK",		"RSRVD", "UUSK"}; 	/* Segment access mode. */	am = (cfg & MIPS_SEGCFG_AM) >> MIPS_SEGCFG_AM_SHIFT;	str += sprintf(str, "%-5s", am_str[am]); 	/*	 * Access modes MK, MSK and MUSK are mapped segments. Therefore	 * there is no direct physical address mapping unless it becomes	 * unmapped uncached at error level due to EU.	 */	if ((am == 0) || (am > 3) || (cfg & MIPS_SEGCFG_EU))		str += sprintf(str, "         %03lx",			((cfg & MIPS_SEGCFG_PA) >> MIPS_SEGCFG_PA_SHIFT));	else		str += sprintf(str, "         UND"); 	if ((am == 0) || (am > 3))		str += sprintf(str, "         %01ld",			((cfg & MIPS_SEGCFG_C) >> MIPS_SEGCFG_C_SHIFT));	else		str += sprintf(str, "         U"); 	/* Exception configuration. */	str += sprintf(str, "       %01ld\n",		((cfg & MIPS_SEGCFG_EU) >> MIPS_SEGCFG_EU_SHIFT));} static int show_segments(struct seq_file *m, void *v){	unsigned int segcfg;	char str[42]; 	seq_puts(m, "Segment   Virtual    Size   Access Mode   Physical   Caching   EU\n");	seq_puts(m, "-------   -------    ----   -----------   --------   -------   --\n"); 	segcfg = read_c0_segctl0();	build_segment_config(str, segcfg);	seq_printf(m, "   0      e0000000   512M      %s", str); 	segcfg >>= 16;	build_segment_config(str, segcfg);	seq_printf(m, "   1      c0000000   512M      %s", str); 	segcfg = read_c0_segctl1();	build_segment_config(str, segcfg);	seq_printf(m, "   2      a0000000   512M      %s", str); 	segcfg >>= 16;	build_segment_config(str, segcfg);	seq_printf(m, "   3      80000000   512M      %s", str); 	segcfg = read_c0_segctl2();	build_segment_config(str, segcfg);	seq_printf(m, "   4      40000000    1G       %s", str); 	segcfg >>= 16;	build_segment_config(str, segcfg);	seq_printf(m, "   5      00000000    1G       %s\n", str); 	return 0;} static int segments_open(struct inode *inode, struct file *file){	return single_open(file, show_segments, NULL);} static const struct file_operations segments_fops = {	.open		= segments_open,	.read		= seq_read,	.llseek		= seq_lseek,	.release	= single_release,}; static int __init segments_info(void){	if (cpu_has_segments)		debugfs_create_file("segments", S_IRUGO, mips_debugfs_dir, NULL,				    &segments_fops);	return 0;} device_initcall(segments_info);