?? memtool.c
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#include <unistd.h>#include <linux/stat.h>#include <linux/types.h>#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <sys/mman.h>#include "arg_env.h"#define MEMDEV "/dev/mem"#define MEMOFFSET 512static int dump(unsigned int phy_addr, unsigned int addr, unsigned int len){ int i = 0; for(i = 0; i < (len >> 2); i++) { if((i % 4) == 0) { printf("\n0x%08x:", phy_addr); } printf("%08x ", *(unsigned int *)addr); addr += sizeof(int); phy_addr += sizeof(int); } printf("\n"); return 0;}int main(int argc, char **argv){ int m_fd = -1; int vir_addr = -1; unsigned int start_phy = 0x0; unsigned int len_vir = 0x0; unsigned int value = 0x0; if((argc < 2) || (argc >3)) { printf("Usage:\n\t%s PHY_ADDR\n", argv[0]); return -1; } start_phy = hex(argv[1]); if(start_phy == -1) { printf("phy_addr error!\n"); return -1; }#if 0 len_vir = hex(argv[2]); if(len_vir == -1) { printf("len error!\n"); return -1; }#endif //printf("start_phy = 0x%08x,len_vir = 0x%08x\n", start_phy, len_vir); m_fd = open(MEMDEV, O_RDWR, 0655); if (m_fd < 0) { printf("open memory error!\n"); return -1; } vir_addr = mmap((void*)0, MEMOFFSET, PROT_READ | PROT_WRITE, MAP_SHARED, m_fd, start_phy); if(vir_addr == -1) { printf("mmap failed !\n"); goto err; } if(argc == 2) { dump(start_phy, vir_addr, 0x100); } else if(argc == 3) { value = hex(argv[2]); printf("0x%08x:====>0x%08x\n", start_phy, value); *(unsigned int *)vir_addr = value; }err: close(m_fd); return 0;}?? 快捷鍵說明
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