cmd_bootm: Add command line arguments to Plan 9
This patch introduces support for command line arguments to Plan 9.
Plan 9 generally dedicates a small region of kernel memory (known
as CONFADDR) for runtime configuration. A new environment variable
named confaddr was introduced to indicate this location when copying
arguments.
Signed-off-by: Steven Stallion <sstallion@gmail.com>
[trini: Adapt for Simon's changes about correcting argc, no need to bump
by 2 now]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index bf14a0e..ba0bcd4 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -1393,6 +1393,19 @@
}
#endif /* CONFIG_SILENT_CONSOLE */
+#if defined(CONFIG_BOOTM_NETBSD) || defined(CONFIG_BOOTM_PLAN9)
+static void copy_args(char *dest, int argc, char * const argv[], char delim)
+{
+ int i;
+
+ for (i = 0; i < argc; i++) {
+ if (i > 0)
+ *dest++ = delim;
+ strcpy(dest, argv[i]);
+ dest += strlen(argv[i]);
+ }
+}
+#endif
/*******************************************************************/
/* OS booting routines */
@@ -1455,13 +1468,7 @@
for (i = 0, len = 0; i < argc; i += 1)
len += strlen(argv[i]) + 1;
cmdline = malloc(len);
-
- for (i = 0, len = 0; i < argc; i += 1) {
- if (i > 0)
- cmdline[len++] = ' ';
- strcpy(&cmdline[len], argv[i]);
- len += strlen(argv[i]);
- }
+ copy_args(cmdline, argc, argv, ' ');
} else if ((cmdline = getenv("bootargs")) == NULL) {
cmdline = "";
}
@@ -1580,6 +1587,7 @@
bootm_headers_t *images)
{
void (*entry_point)(void);
+ char *s;
if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
return 1;
@@ -1591,6 +1599,20 @@
}
#endif
+ /* See README.plan9 */
+ s = getenv("confaddr");
+ if (s != NULL) {
+ char *confaddr = (char *)simple_strtoul(s, NULL, 16);
+
+ if (argc > 0) {
+ copy_args(confaddr, argc, argv, '\n');
+ } else {
+ s = getenv("bootargs");
+ if (s != NULL)
+ strcpy(confaddr, s);
+ }
+ }
+
entry_point = (void (*)(void))images->ep;
printf("## Transferring control to Plan 9 (at address %08lx) ...\n",
diff --git a/doc/README.plan9 b/doc/README.plan9
new file mode 100644
index 0000000..2d3d0e0
--- /dev/null
+++ b/doc/README.plan9
@@ -0,0 +1,18 @@
+Plan 9 from Bell Labs kernel images require additional setup to pass
+configuration information to the kernel. An environment variable named
+confaddr must be defined with the same value as CONFADDR (see mem.h).
+Use of this facility is optional, but should be preferable to manual
+configuration.
+
+When booting an image, arguments supplied to the bootm command will be
+copied to CONFADDR. If no arguments are specified, the contents of the
+bootargs environment variable will be copied.
+
+If no command line arguments or bootargs are defined, CONFADDR is left
+uninitialized to permit manual configuration. For example, PC-style
+configuration could be simulated by issuing a fatload in bootcmd:
+
+ # setenv bootcmd fatload mmc 0 $confaddr plan9.ini; ...; bootm
+
+Steven Stallion
+June 2013