File fix_usage_on_64_bits.patch of Package devmem2

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File fix_usage_on_64_bits.patch of Package devmem2 (Revision 59566bc347e6d79c6f51e7ec8af9544d)

Currently displaying revision 59566bc347e6d79c6f51e7ec8af9544d , Show latest

--- devmem2.c.orig	2004-09-09 21:19:29.000000000 +0200
+++ devmem2.c	2017-05-05 13:17:10.682241495 +0200
@@ -1,7 +1,7 @@
 /*
  * devmem2.c: Simple program to read/write from/to any location in memory.
  *
- *  Copyright (C) 2000, Jan-Derk Bakker (J.D.Bakker@its.tudelft.nl)
+ *  Copyright (C) 2000, Jan-Derk Bakker (jdb@lartmaker.nl)
  *
  *
  * This software has been developed for the LART computing board
@@ -10,16 +10,6 @@
  * and Ubiquitous Communications (http://www.ubicom.tudelft.nl/)
  * projects.
  *
- * The author can be reached at:
- *
- *  Jan-Derk Bakker
- *  Information and Communication Theory Group
- *  Faculty of Information Technology and Systems
- *  Delft University of Technology
- *  P.O. Box 5031
- *  2600 GA Delft
- *  The Netherlands
- *
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -46,6 +36,7 @@
 #include <fcntl.h>
 #include <ctype.h>
 #include <termios.h>
+#include <stdint.h>
 #include <sys/types.h>
 #include <sys/mman.h>
   
@@ -55,77 +46,99 @@
 #define MAP_SIZE 4096UL
 #define MAP_MASK (MAP_SIZE - 1)
 
-int main(int argc, char **argv) {
-    int fd;
-    void *map_base, *virt_addr; 
-	unsigned long read_result, writeval;
+int main(int argc, char **argv)
+{
+	uint64_t read_result, writeval;
+	unsigned int access_size = sizeof(uint32_t);
+	void *map_base, *virt_addr; 
 	off_t target;
+	int fd;
 	int access_type = 'w';
 	
 	if(argc < 2) {
 		fprintf(stderr, "\nUsage:\t%s { address } [ type [ data ] ]\n"
 			"\taddress : memory address to act upon\n"
-			"\ttype    : access operation type : [b]yte, [h]alfword, [w]ord\n"
+			"\ttype    : access operation type:\n"
+			"\t          [b]yte (8bit), [h]alfword (16bit), [w]ord (32bit), [l]ong (64bit)\n"
 			"\tdata    : data to be written\n\n",
 			argv[0]);
 		exit(1);
 	}
-	target = strtoul(argv[1], 0, 0);
 
+	target = strtoul(argv[1], 0, 0);
 	if(argc > 2)
 		access_type = tolower(argv[2][0]);
 
+	fd = open("/dev/mem", O_RDWR | O_SYNC);
+	if (fd == -1)
+		FATAL;
+
+	/* Map one page */
+	map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED,
+			fd, target & ~MAP_MASK);
+	if (map_base == (void *)-1)
+		FATAL;
+
+	close(fd);
+
+	virt_addr = map_base + (target & MAP_MASK);
+	switch (access_type) {
+	case 'b':
+		read_result = *(uint8_t *)virt_addr;
+		access_size = sizeof(uint8_t);
+		break;
+	case 'h':
+		read_result = *(uint16_t *)virt_addr;
+		access_size = sizeof(uint16_t);
+		break;
+	case 'w':
+		read_result = *(uint32_t *)virt_addr;
+		access_size = sizeof(uint32_t);
+		break;
+	case 'l':
+		read_result = *(uint64_t *)virt_addr;
+		access_size = sizeof(uint64_t);
+		break;
+	default:
+		fprintf(stderr, "Illegal data type '%c'.\n", access_type);
+		exit(2);
+	}
+
+	printf("Value at address 0x%08lx: 0x%0*llx\n",
+	       (unsigned long)target, access_size * 2,
+	       (unsigned long long)read_result); 
+	fflush(stdout);
 
-    if((fd = open("/dev/mem", O_RDWR | O_SYNC)) == -1) FATAL;
-    printf("/dev/mem opened.\n"); 
-    fflush(stdout);
-    
-    /* Map one page */
-    map_base = mmap(0, MAP_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, target & ~MAP_MASK);
-    if(map_base == (void *) -1) FATAL;
-    printf("Memory mapped at address %p.\n", map_base); 
-    fflush(stdout);
-    
-    virt_addr = map_base + (target & MAP_MASK);
-    switch(access_type) {
+	if(argc > 3) {
+		writeval = strtoull(argv[3], 0, 0);
+		switch(access_type) {
 		case 'b':
-			read_result = *((unsigned char *) virt_addr);
+			*(volatile uint8_t *)virt_addr = writeval;
+			read_result = *(volatile uint8_t *)virt_addr;
 			break;
 		case 'h':
-			read_result = *((unsigned short *) virt_addr);
+			*(volatile uint16_t *) virt_addr = writeval;
+			read_result = *(volatile uint16_t *)virt_addr;
 			break;
 		case 'w':
-			read_result = *((unsigned long *) virt_addr);
+			*(volatile uint32_t *)virt_addr = writeval;
+			read_result = *(volatile uint32_t *)virt_addr;
+			break;
+		case 'l':
+			*(volatile uint64_t *)virt_addr = writeval;
+			read_result = *(volatile uint64_t *)virt_addr;
 			break;
-		default:
-			fprintf(stderr, "Illegal data type '%c'.\n", access_type);
-			exit(2);
-	}
-    printf("Value at address 0x%X (%p): 0x%X\n", target, virt_addr, read_result); 
-    fflush(stdout);
-
-	if(argc > 3) {
-		writeval = strtoul(argv[3], 0, 0);
-		switch(access_type) {
-			case 'b':
-				*((unsigned char *) virt_addr) = writeval;
-				read_result = *((unsigned char *) virt_addr);
-				break;
-			case 'h':
-				*((unsigned short *) virt_addr) = writeval;
-				read_result = *((unsigned short *) virt_addr);
-				break;
-			case 'w':
-				*((unsigned long *) virt_addr) = writeval;
-				read_result = *((unsigned long *) virt_addr);
-				break;
 		}
-		printf("Written 0x%X; readback 0x%X\n", writeval, read_result); 
+		printf("Written 0x%0*llx; readback 0x%0*llx\n",
+			access_size * 2,
+			(unsigned long long)writeval,
+			access_size * 2,
+			(unsigned long long)read_result); 
 		fflush(stdout);
 	}
 	
 	if(munmap(map_base, MAP_SIZE) == -1) FATAL;
-    close(fd);
-    return 0;
+
+	return 0;
 }

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File fix_usage_on_64_bits.patch of Package devmem2 (Revision 59566bc347e6d79c6f51e7ec8af9544d)

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