[src/trunk]: src/sys/arch/powerpc/powerpc Query real-mode? at startup and cac...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/f24eeea620c5
branches:  trunk
changeset: 952860:f24eeea620c5
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Sat Feb 20 01:57:54 2021 +0000

description:
Query real-mode? at startup and cache the result.

diffstat:

 sys/arch/powerpc/powerpc/ofw_machdep.c |  37 ++++++++++++++++++++++++++++++++-
 1 files changed, 35 insertions(+), 2 deletions(-)

diffs (79 lines):

diff -r c0ef4ac2f3e5 -r f24eeea620c5 sys/arch/powerpc/powerpc/ofw_machdep.c
--- a/sys/arch/powerpc/powerpc/ofw_machdep.c    Sat Feb 20 01:43:04 2021 +0000
+++ b/sys/arch/powerpc/powerpc/ofw_machdep.c    Sat Feb 20 01:57:54 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ofw_machdep.c,v 1.28 2021/02/19 05:21:39 thorpej Exp $ */
+/*     $NetBSD: ofw_machdep.c,v 1.29 2021/02/20 01:57:54 thorpej Exp $ */
 
 /*-
  * Copyright (c) 2007, 2021 The NetBSD Foundation, Inc.
@@ -61,7 +61,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: ofw_machdep.c,v 1.28 2021/02/19 05:21:39 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: ofw_machdep.c,v 1.29 2021/02/20 01:57:54 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/buf.h>
@@ -91,6 +91,8 @@
 int    ofw_root;
 int    ofw_chosen;
 
+bool   ofw_real_mode;
+
 /*
  * Bootstrap console support functions.
  */
@@ -411,6 +413,21 @@
        }
 }
 
+static bool
+ofw_option_truefalse(const char *prop, int proplen)
+{
+       /* These are all supposed to be strings. */
+       switch (prop[0]) {
+       case 'y':
+       case 'Y':
+       case 't':
+       case 'T':
+       case '1':
+               return true;
+       }
+       return false;
+}
+
 /*
  * Called from ofwinit() very early in bootstrap.  We are still
  * running on the stack provided by OpenFirmware and in the same
@@ -421,6 +438,9 @@
 void
 ofw_bootstrap(void)
 {
+       char prop[32];
+       int handle, proplen;
+
        /* Stash the handles for "/" and "/chosen" for convenience later. */
        ofw_root = OF_finddevice("/");
        ofw_chosen = OF_finddevice("/chosen");
@@ -428,6 +448,19 @@
        /* Initialize the early bootstrap console. */
        ofw_bootstrap_console();
 
+       /* Check to see if we're running in real-mode. */
+       handle = OF_finddevice("/options");
+       if (handle != -1) {
+               proplen = OF_getprop(handle, "real-mode?", prop, sizeof(prop));
+               if (proplen > 0) {
+                       ofw_real_mode = ofw_option_truefalse(prop, proplen);
+               } else {
+                       ofw_real_mode = false;
+               }
+       }
+       aprint_normal("OpenFirmware running in %s-mode\n",
+           ofw_real_mode ? "real" : "virtual");
+
        /* Get #address-cells and #size-cells to fething memory info. */
        if (OF_getprop(ofw_root, "#address-cells", &ofw_address_cells,
                       sizeof(ofw_address_cells)) <= 0)