From fdfedc3bb4681dabd75972f302f5898024d10a87 Mon Sep 17 00:00:00 2001
From: bz <bz@FreeBSD.org>
Date: Sat, 16 Aug 2014 14:14:29 +0000
Subject: MFC r264605:

 Based on xlp_machdep.c and completed the list of options based on
 boot/mips/beri/loader/metadata.c allow FDT configuration to set
 command line options.
 This leads to an interesting quesiton of future interactions with loader.
 However for configurations without loader this allows bootverbose or boot
 single user to be set by compiling a new kernel, which is good enough for
 testing and debugging.

 Reviewed by:	rwatson
Sponsored by:	DARPA/AFRL
---
 sys/mips/beri/beri_machdep.c | 49 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

(limited to 'sys/mips')

diff --git a/sys/mips/beri/beri_machdep.c b/sys/mips/beri/beri_machdep.c
index 85dd153..870e461 100644
--- a/sys/mips/beri/beri_machdep.c
+++ b/sys/mips/beri/beri_machdep.c
@@ -131,6 +131,46 @@ platform_reset(void)
 		__asm__ __volatile("wait");
 }
 
+#ifdef FDT
+/* Parse cmd line args as env - copied from xlp_machdep. */
+/* XXX-BZ this should really be centrally provided for all (boot) code. */
+static void
+_parse_bootargs(char *cmdline)
+{
+	char *n, *v;
+
+	while ((v = strsep(&cmdline, " \n")) != NULL) {
+		if (*v == '\0')
+			continue;
+		if (*v == '-') {
+			while (*v != '\0') {
+				v++;
+				switch (*v) {
+				case 'a': boothowto |= RB_ASKNAME; break;
+				/* Someone should simulate that ;-) */
+				case 'C': boothowto |= RB_CDROM; break;
+				case 'd': boothowto |= RB_KDB; break;
+				case 'D': boothowto |= RB_MULTIPLE; break;
+				case 'm': boothowto |= RB_MUTE; break;
+				case 'g': boothowto |= RB_GDB; break;
+				case 'h': boothowto |= RB_SERIAL; break;
+				case 'p': boothowto |= RB_PAUSE; break;
+				case 'r': boothowto |= RB_DFLTROOT; break;
+				case 's': boothowto |= RB_SINGLE; break;
+				case 'v': boothowto |= RB_VERBOSE; break;
+				}
+			}
+		} else {
+			n = strsep(&v, "=");
+			if (v == NULL)
+				setenv(n, "1");
+			else
+				setenv(n, v);
+		}
+	}
+}
+#endif
+
 void
 platform_start(__register_t a0, __register_t a1,  __register_t a2, 
     __register_t a3)
@@ -142,7 +182,9 @@ platform_start(__register_t a0, __register_t a1,  __register_t a2,
 	char **envp = (char **)a2;
 	unsigned int memsize = a3;
 #ifdef FDT
+	char buf[2048];		/* early stack supposedly big enough */
 	vm_offset_t dtbp;
+	phandle_t chosen;
 	void *kmdp;
 #endif
 	int i;
@@ -180,6 +222,13 @@ platform_start(__register_t a0, __register_t a1,  __register_t a2,
 		while (1);
 	if (OF_init((void *)dtbp) != 0)
 		while (1);
+
+	/*
+	 * Get bootargs from FDT if specified.
+	 */
+	chosen = OF_finddevice("/chosen");
+	if (OF_getprop(chosen, "bootargs", buf, sizeof(buf)) != -1)
+		_parse_bootargs(buf);
 #endif
 
 	/*
-- 
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