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devmem.c
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devmem.c
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#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <fcntl.h>
#include <ctype.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <stdbool.h>
#define FATAL do { fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n", \
__LINE__, __FILE__, errno, strerror(errno)); exit(1); } while(0)
#define utils_printf printf("[devmem_tool] "); printf
#define utils_fprintf fprintf(stderr, "[devmem_tool] "); fprintf
#define MAP_SIZE (4096UL) // Page size
#define MAP_MASK (MAP_SIZE - 1) // MAP_MASK = 0XFFF
#define BUFFER_SIZE (MAP_SIZE + MAP_SIZE)
typedef enum operation_t {
OP_READ = 0,
OP_WRITE
} IO_TYPE_T;
static inline void devmem_usage(void)
{
utils_printf("Usage ./devmem_tool read/write 0xfa0000 20\n");
utils_printf("The read/write is the command type, read or write data to memory\n");
utils_printf("The 0xfa2000 is the memory physical address\n");
utils_printf("The 20 is read/write data length, uint is 4 byte, so it is total 20 * 4 = 80 bytes\n");
utils_printf("Usage: ./devmem_tool read 0xfa0000 20\n");
utils_printf("Usage: ./devmem_tool write 0xfa0000 20\n");
}
static int32_t devmem_io(intptr_t physical_addr, uint64_t *buffer, size_t *io_len, IO_TYPE_T op)
{
int32_t ret = 0;
int32_t fd = 0;
size_t i = 0;
size_t offset = 0;
size_t len = 0;
intptr_t addr = physical_addr;
void *map_base = NULL;
void *virt_addr = NULL;
if (NULL == buffer ||
NULL == io_len ||
0 == *io_len ||
op >= 2) {
ret = -1;
utils_printf("%s %s %d, input error\n",
__FILE__, __func__, __LINE__);
goto finish;
}
len = *io_len;
fd = open("/dev/mem", O_RDWR | O_SYNC);
if (fd < 0) {
ret = -1;
utils_printf("open /dev/mem failed\n");
utils_fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n",
__LINE__, __FILE__, errno, strerror(errno));
goto finish;
}
if (op == OP_READ) {
map_base = mmap(0,
MAP_SIZE, PROT_READ,
MAP_SHARED,
fd, addr & ~MAP_MASK);
} else {
map_base = mmap(0,
MAP_SIZE, PROT_WRITE,
MAP_SHARED,
fd, addr & ~MAP_MASK);
}
if ((void *) -1 == map_base) {
ret = -1;
utils_printf("mmap /dev/mem failed\n");
utils_fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n",
__LINE__, __FILE__, errno, strerror(errno));
goto fd_finish;
}
for (i = 0; i < len; i ++) {
// turn the page
if (offset >= MAP_MASK) {
offset = 0;
ret = munmap(map_base, MAP_SIZE);
if (-1 == ret) {
utils_printf("munmap /dev/mem failed\n");
utils_fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n",
__LINE__, __FILE__, errno, strerror(errno));
goto fd_finish;
}
ret = 0;
if (op == OP_READ) {
map_base = mmap(0,
MAP_SIZE, PROT_READ,
MAP_SHARED,
fd, addr & ~MAP_MASK);
} else {
map_base = mmap(0,
MAP_SIZE, PROT_WRITE,
MAP_SHARED,
fd, addr & ~MAP_MASK);
}
if ((void *) -1 == map_base) {
ret = -1;
utils_printf("mmap /dev/mem failed\n");
utils_fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n",
__LINE__, __FILE__, errno, strerror(errno));
goto fd_finish;
}
utils_printf("map_base over 4k = [%p].\n", map_base);
}
virt_addr = map_base + (addr & MAP_MASK);
if (op == OP_WRITE) {
*(volatile uint64_t*)virt_addr = buffer[i];
} else {
buffer[i] = *(volatile uint64_t*)virt_addr;
}
addr += 4, offset += 4;
}
ret = munmap(map_base, MAP_SIZE);
if (-1 == ret) {
utils_printf("munmap failed\n");
utils_fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n",
__LINE__, __FILE__, errno, strerror(errno));
}
*io_len = i;
fd_finish:
close(fd);
finish:
return ret;
}
int main(int argc, char **argv)
{
int ret = 0;
uint64_t buffer[BUFFER_SIZE];
size_t len = 0;
size_t i = 0;
intptr_t addr = 0;
if (argc != 4) {
ret = -1;
devmem_usage();
goto finish;
}
// check input args addr
addr = (uint64_t)strtoul(argv[2], 0, 0);
len = (uint64_t)strtoul(argv[3], 0, 0);
utils_printf("Target phy addr : %lx\n", addr);
utils_printf("Target len: %ld\n", len);
memset(buffer, 0, len);
// check input args op
if (strcmp(argv[1], "read") == 0) {
utils_printf("OP: Read data\n");
ret = devmem_io(addr, buffer, &len, OP_READ);
if (0 != ret) {
utils_printf("read error!\n");
utils_fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n",
__LINE__, __FILE__, errno, strerror(errno));
goto finish;
}
for (i = 0; i < len; i ++) {
utils_printf("address = 0x%08lx, data = 0x%08lx\n",
(addr + i * 4), buffer[i]);
}
} else if (strcmp(argv[1], "write") == 0) {
utils_printf("OP: Write data\n");
for (i = 0; i < len; i++) {
buffer[i] = i;
}
ret = devmem_io(addr, buffer, &len, OP_WRITE);
if (0 != ret) {
utils_printf("write error!\n");
utils_fprintf(stderr, "Error at line %d, file %s (%d) [%s]\n",
__LINE__, __FILE__, errno, strerror(errno));
goto finish;
}
} else {
utils_printf("error command type\n");
devmem_usage();
}
finish:
return ret;
}