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https://github.com/brain-hackers/u-boot-brain
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![Tom Rini](/assets/img/avatar_default.png)
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
175 lines
3.2 KiB
C
175 lines
3.2 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 <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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setenv(varname, str_output);
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free(str_output);
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}
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void decode_hexstring(char *hexstr, u8 *result)
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{
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int i;
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int acc = 0;
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for (i = 0; i < strlen(hexstr); ++i) {
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char d = hexstr[i];
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int value;
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if (isdigit(d))
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value = (d - '0');
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else
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value = (islower(d) ? toupper(d) : d) - 'A' + 10;
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if (i % 2 == 0) {
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acc = value * 16;
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} else {
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result[i / 2] = acc + value;
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acc = 0;
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}
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}
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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 = getenv(varname);
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if (str_value)
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decode_hexstring(str_value, result);
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else
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decode_hexstring(varname, result);
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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 = simple_strtoul(varname, NULL, 16);
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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(cmd_tbl_t *cmdtp, int flag, int argc, 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 = simple_strtoul(lenarg, NULL, 10);
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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(simple_strtoul(src1arg + 1, NULL, 16), 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(simple_strtoul(src2arg + 1, NULL, 16), 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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