2 * SPDX-License-Identifier: GPL-2.0+
9 #include <linux/ctype.h>
17 void write_to_env_var(char *varname, u8 *result, ulong len)
23 str_output = malloc(len * 2 + 1);
26 for (i = 0; i < len; i++) {
27 sprintf(str_ptr, "%02x", result[i]);
31 setenv(varname, str_output);
36 void decode_hexstring(char *hexstr, u8 *result)
41 for (i = 0; i < strlen(hexstr); ++i) {
48 value = (islower(d) ? toupper(d) : d) - 'A' + 10;
53 result[i / 2] = acc + value;
59 void read_from_env_var(char *varname, u8 *result)
63 str_value = getenv(varname);
65 decode_hexstring(str_value, result);
67 decode_hexstring(varname, result);
70 void read_from_mem(ulong addr, u8 *result, ulong len)
74 src = map_sysmem(addr, len);
75 memcpy(result, src, len);
79 void write_to_mem(char *varname, u8 *result, ulong len)
84 addr = simple_strtoul(varname, NULL, 16);
85 buf = map_sysmem(addr, len);
86 memcpy(buf, result, len);
90 static int do_binop(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
93 u8 *result, *src1, *src2;
94 char *oparg, *lenarg, *src1arg, *src2arg, *destarg;
105 if (!strcmp(oparg, "xor"))
107 else if (!strcmp(oparg, "or"))
109 else if (!strcmp(oparg, "and"))
112 return CMD_RET_USAGE;
114 len = simple_strtoul(lenarg, NULL, 10);
120 read_from_mem(simple_strtoul(src1arg + 1, NULL, 16), src1, len);
122 read_from_env_var(src1arg, src1);
125 read_from_mem(simple_strtoul(src2arg + 1, NULL, 16), src2, len);
127 read_from_env_var(src2arg, src2);
129 result = malloc(len);
133 for (i = 0; i < len; i++)
134 result[i] = src1[i] ^ src2[i];
137 for (i = 0; i < len; i++)
138 result[i] = src1[i] | src2[i];
141 for (i = 0; i < len; i++)
142 result[i] = src1[i] & src2[i];
147 for (i = 0; i < len; i++) {
148 printf("%02x ", result[i]);
160 write_to_mem(destarg + 1, result, len); /* Skip asterisk */
162 write_to_env_var(destarg, result, len);
172 binop, 6, 1, do_binop,
173 "compute binary operation",
174 "op count [*]src1 [*]src2 [[*]dest]\n"
175 " - compute binary operation of data at/in src1 and\n src2 (either *memaddr, env var name or hex string)\n and store result in/at dest, where op is one of\n xor, or, and."