155 lines
2.8 KiB
C
155 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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#include <common.h>
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#include <command.h>
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#include <env.h>
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#include <hexdump.h>
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#include <malloc.h>
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#include <mapmem.h>
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#include <linux/ctype.h>
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enum {
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OP_ID_XOR,
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OP_ID_AND,
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OP_ID_OR,
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};
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void write_to_env_var(char *varname, u8 *result, ulong len)
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{
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char *str_output;
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char *str_ptr;
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int i;
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str_output = malloc(len * 2 + 1);
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str_ptr = str_output;
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for (i = 0; i < len; i++) {
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sprintf(str_ptr, "%02x", result[i]);
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str_ptr += 2;
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}
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*str_ptr = '\0';
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env_set(varname, str_output);
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free(str_output);
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}
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void read_from_env_var(char *varname, u8 *result)
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{
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char *str_value;
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str_value = env_get(varname);
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if (str_value)
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hex2bin(result, str_value, strlen(str_value) / 2);
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else
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hex2bin(result, varname, strlen(varname) / 2);
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}
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void read_from_mem(ulong addr, u8 *result, ulong len)
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{
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u8 *src;
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src = map_sysmem(addr, len);
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memcpy(result, src, len);
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unmap_sysmem(src);
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}
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void write_to_mem(char *varname, u8 *result, ulong len)
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{
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ulong addr;
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u8 *buf;
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addr = hextoul(varname, NULL);
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buf = map_sysmem(addr, len);
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memcpy(buf, result, len);
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unmap_sysmem(buf);
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}
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static int do_binop(struct cmd_tbl *cmdtp, int flag, int argc,
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char *const argv[])
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{
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ulong len;
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u8 *result, *src1, *src2;
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char *oparg, *lenarg, *src1arg, *src2arg, *destarg;
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int i, op;
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if (argc < 5)
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return CMD_RET_USAGE;
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oparg = argv[1];
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lenarg = argv[2];
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src1arg = argv[3];
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src2arg = argv[4];
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if (!strcmp(oparg, "xor"))
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op = OP_ID_XOR;
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else if (!strcmp(oparg, "or"))
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op = OP_ID_OR;
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else if (!strcmp(oparg, "and"))
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op = OP_ID_AND;
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else
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return CMD_RET_USAGE;
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len = dectoul(lenarg, NULL);
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src1 = malloc(len);
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src2 = malloc(len);
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if (*src1arg == '*')
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read_from_mem(hextoul(src1arg + 1, NULL), src1, len);
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else
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read_from_env_var(src1arg, src1);
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if (*src2arg == '*')
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read_from_mem(hextoul(src2arg + 1, NULL), src2, len);
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else
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read_from_env_var(src2arg, src2);
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result = malloc(len);
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switch (op) {
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case OP_ID_XOR:
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for (i = 0; i < len; i++)
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result[i] = src1[i] ^ src2[i];
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break;
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case OP_ID_OR:
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for (i = 0; i < len; i++)
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result[i] = src1[i] | src2[i];
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break;
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case OP_ID_AND:
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for (i = 0; i < len; i++)
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result[i] = src1[i] & src2[i];
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break;
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}
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if (argc == 5) {
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for (i = 0; i < len; i++) {
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printf("%02x ", result[i]);
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if (i % 16 == 15)
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puts("\n");
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}
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puts("\n");
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goto exit;
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}
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destarg = argv[5];
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if (*destarg == '*')
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write_to_mem(destarg + 1, result, len); /* Skip asterisk */
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else
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write_to_env_var(destarg, result, len);
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exit:
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free(result);
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free(src2);
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free(src1);
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return 0;
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}
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U_BOOT_CMD(
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binop, 6, 1, do_binop,
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"compute binary operation",
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"op count [*]src1 [*]src2 [[*]dest]\n"
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" - 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."
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);
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