/*
 * Functions for reading memory regions and Calypso die ID via ETM
 */

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "etm.h"
#include "limits.h"
#include "localtypes.h"
#include "exitcodes.h"

extern u_char rvi_msg[];
extern int rvi_msg_len;

do_memory_read(memaddr, databuf, nbytes)
	u32 memaddr;
	u_char *databuf;
{
	u_char cmdpkt[10];
	int rc;

	if (nbytes > MAX_MEMREAD_BYTES) {
		printf("error: # of bytes to read may not exceed %d\n",
			MAX_MEMREAD_BYTES);
		return(ERROR_USAGE);
	}
	cmdpkt[1] = ETM_CORE;
	cmdpkt[2] = TMCORE_OPC_MEM;
	cmdpkt[3] = 0x01;
	cmdpkt[4] = nbytes;
	cmdpkt[5] = memaddr;
	cmdpkt[6] = memaddr >> 8;
	cmdpkt[7] = memaddr >> 16;
	cmdpkt[8] = memaddr >> 24;
	rc = etm_pkt_exch(cmdpkt, 8);
	if (rc)
		return(rc);
	if (rvi_msg[3]) {
		printf("ETM error response to mem read request: 0x%02X\n",
			rvi_msg[3]);
		return(ERROR_TARGET);
	}
	if (rvi_msg_len != nbytes + 7) {
		printf("error: mem read response has wrong length\n");
		return(ERROR_TARGET);
	}
	if (rvi_msg[4] != TMCORE_OPC_MEM || rvi_msg[5] != 0x01) {
		printf("error: mem read response has wrong opcode\n");
		return(ERROR_TARGET);
	}
	bcopy(rvi_msg + 6, databuf, nbytes);
	return(0);
}