1 files changed, 96 insertions, 0 deletions
diff --git a/roms/u-boot-sam460ex/common/cmd_setexpr.c b/roms/u-boot-sam460ex/common/cmd_setexpr.c
new file mode 100644
index 000000000..da9e844a8
--- /dev/null
+++ b/roms/u-boot-sam460ex/common/cmd_setexpr.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2008 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * This file provides a shell like 'expr' function to return.
+ */
+
+#include <common.h>
+#include <config.h>
+#include <command.h>
+
+static ulong get_arg(char *s, int w)
+{
+	ulong *p;
+
+	/*
+	 * if the parameter starts with a '*' then assume
+	 * it is a pointer to the value we want
+	 */
+
+	if (s[0] == '*') {
+		p = (ulong *)simple_strtoul(&s[1], NULL, 16);
+		switch (w) {
+		case 1: return((ulong)(*(uchar *)p));
+		case 2: return((ulong)(*(ushort *)p));
+		case 4:
+		default: return(*p);
+		}
+	} else {
+		return simple_strtoul(s, NULL, 16);
+	}
+}
+
+int do_setexpr(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+	ulong a, b;
+	char buf[16];
+	int w;
+
+	/* Validate arguments */
+	if ((argc != 5) || (strlen(argv[3]) != 1)) {
+		cmd_usage(cmdtp);
+		return 1;
+	}
+
+	w = cmd_get_data_size(argv[0], 4);
+
+	a = get_arg(argv[2], w);
+	b = get_arg(argv[4], w);
+
+	switch (argv[3][0]) {
+	case '|': sprintf(buf, "%lx", (a | b)); break;
+	case '&': sprintf(buf, "%lx", (a & b)); break;
+	case '+': sprintf(buf, "%lx", (a + b)); break;
+	case '^': sprintf(buf, "%lx", (a ^ b)); break;
+	case '-': sprintf(buf, "%lx", (a - b)); break;
+	case '*': sprintf(buf, "%lx", (a * b)); break;
+	case '/': sprintf(buf, "%lx", (a / b)); break;
+	case '%': sprintf(buf, "%lx", (a % b)); break;
+	default:
+		printf("invalid op\n");
+		return 1;
+	}
+
+	setenv(argv[1], buf);
+
+	return 0;
+}
+
+U_BOOT_CMD(
+	setexpr, 5, 0, do_setexpr,
+	"set environment variable as the result of eval expression",
+	"[.b, .w, .l] name value1 <op> value2\n"
+	"    - set environment variable 'name' to the result of the evaluated\n"
+	"      express specified by <op>.  <op> can be &, |, ^, +, -, *, /, %\n"
+	"      size argument is only meaningful if value1 and/or value2 are memory addresses"
+);