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-rw-r--r--lib_generic/display_options.c70
1 files changed, 70 insertions, 0 deletions
diff --git a/lib_generic/display_options.c b/lib_generic/display_options.c
index 512e898..5ddd94f 100644
--- a/lib_generic/display_options.c
+++ b/lib_generic/display_options.c
@@ -21,7 +21,10 @@
* MA 02111-1307 USA
*/
+#include <config.h>
#include <common.h>
+#include <linux/ctype.h>
+#include <asm/io.h>
int display_options (void)
{
@@ -65,3 +68,70 @@ void print_size (ulong size, const char *s)
}
printf (" %cB%s", c, s);
}
+
+/*
+ * Print data buffer in hex and ascii form to the terminal.
+ *
+ * data reads are buffered so that each memory address is only read once.
+ * Useful when displaying the contents of volatile registers.
+ *
+ * parameters:
+ * addr: Starting address to display at start of line
+ * data: pointer to data buffer
+ * width: data value width. May be 1, 2, or 4.
+ * count: number of values to display
+ * linelen: Number of values to print per line; specify 0 for default length
+ */
+#define MAX_LINE_LENGTH_BYTES (64)
+#define DEFAULT_LINE_LENGTH_BYTES (16)
+int print_buffer (ulong addr, void* data, uint width, uint count, uint linelen)
+{
+ uint8_t linebuf[MAX_LINE_LENGTH_BYTES];
+ uint32_t *uip = (void*)linebuf;
+ uint16_t *usp = (void*)linebuf;
+ uint8_t *ucp = (void*)linebuf;
+ int i;
+
+ if (linelen*width > MAX_LINE_LENGTH_BYTES)
+ linelen = MAX_LINE_LENGTH_BYTES / width;
+ if (linelen < 1)
+ linelen = DEFAULT_LINE_LENGTH_BYTES / width;
+
+ while (count) {
+ printf("%08lx:", addr);
+
+ /* check for overflow condition */
+ if (count < linelen)
+ linelen = count;
+
+ /* Copy from memory into linebuf and print hex values */
+ for (i = 0; i < linelen; i++) {
+ if (width == 4) {
+ uip[i] = *(volatile uint32_t *)data;
+ printf(" %08x", uip[i]);
+ } else if (width == 2) {
+ usp[i] = *(volatile uint16_t *)data;
+ printf(" %04x", usp[i]);
+ } else {
+ ucp[i] = *(volatile uint8_t *)data;
+ printf(" %02x", ucp[i]);
+ }
+ data += width;
+ }
+
+ /* Print data in ASCII characters */
+ puts(" ");
+ for (i = 0; i < linelen * width; i++)
+ putc(isprint(ucp[i]) && (ucp[i] < 0x80) ? ucp[i] : '.');
+ putc ('\n');
+
+ /* update references */
+ addr += linelen * width;
+ count -= linelen;
+
+ if (ctrlc())
+ return -1;
+ }
+
+ return 0;
+}