/*
 * Print contents of ARM system control register
 *
 * Martin Guy <martinwguy@gmail.com>
 */
#include <stdlib.h>
#include <string.h>
#include <stdio.h>

/* Contents of Maverick Crunch DSPSC register in little-endian mode.
 * See ARM Architecture Reference Manual, Part B, section 2.4 */
struct CP15R1 {
#define u unsigned
	u M:1; u A:1; u C:1; u W:1; u P:1; u D:1; u L:1; u B:1;
	u S:1; u R:1; u F:1; u Z:1; u I:1; u V:1; u RR:1; u L4:1;
	u UNP:16;
#undef u
} cp15r1;

static void read_cp15r1(void);
static void print_cp15r1(void);

main(int argc, char **argv)
{
	read_cp15r1();
	print_cp15r1();

	exit(0);
}

/* Print the contents of the structure in human-readable form */
static void
print_cp15r1()
{
#define c cp15r1
	printf("M=%d  A=%d  C=%d  W=%d  P=%d  D=%d  L=%d  B=%d\n",
		c.M,  c.A,  c.C,  c.W,  c.P,  c.D,  c.L,  c.B);
	printf("S=%d  R=%d  F=%d  Z=%d  I=%d  V=%d  RR=%d  L4=%d\n",
		c.S,  c.R,  c.F,  c.Z,  c.I,  c.V,  c.RR,  c.L4);
#undef d
}

/* Copy register contents into our structure */
static void
read_cp15r1()
{
	/* If you put the ldr after the cfmv32sc, you can
	 * (Tested on Rev E1 hardware).
	 * ldr rN, foo; cfstr64 mvdX, [rN] corrupts memory at random.
	 / (Tested on Rev E1 hardware).
	 */
	asm("ldr	r3, =cp15r1");		/* Get address of dspsc */
	asm("stc	p15, cr1, [r3] ");	/* Store CP15R1 in cp15r1 */
}