Forgot to `cvs add' this file during alpha boot block changes, sorry.

1 files changed, 67 insertions, 0 deletions

diff --git a/sys/arch/alpha/stand/loadfile_subr.c b/sys/arch/alpha/stand/loadfile_subr.c
new file mode 100644
index 00000000000..40f764e70e6
--- /dev/null
+++ b/sys/arch/alpha/stand/loadfile_subr.c
@@ -0,0 +1,67 @@
+/*	$OpenBSD: loadfile_subr.c,v 1.1 2011/06/06 04:09:42 miod Exp $	*/
+
+/*
+ * Copyright (c) 2010 Miodrag Vallat.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <lib/libkern/libkern.h>
+
+#include <sys/exec_elf.h>
+#include <lib/libsa/loadfile.h>
+
+#include <machine/alpha_cpu.h>
+#include <machine/rpb.h>
+
+#define	ptoa(a)	((a) << ALPHA_PGSHIFT)
+
+/*
+ * Prevent loading a kernel if it would overlap the SRM.
+ */
+int
+check_phdr(void *hdr)
+{
+	Elf64_Phdr *phdr = (Elf64_Phdr *)hdr;
+	struct rpb *hwrpb = (struct rpb *)HWRPB_ADDR;
+	struct mddt *mddtp;
+	struct mddt_cluster *memc;
+	u_int64_t cstart, cend;
+	u_int64_t i;
+
+	mddtp = (struct mddt *)(((caddr_t)hwrpb) + hwrpb->rpb_memdat_off);
+	for (i = 0; i < mddtp->mddt_cluster_cnt; i++) {
+		memc = &mddtp->mddt_clusters[i];
+		if (memc->mddt_usage & MDDT_PALCODE) {
+			cstart = ALPHA_PHYS_TO_K0SEG(ptoa(memc->mddt_pfn));
+			cend = cstart + ptoa(memc->mddt_pg_cnt);
+
+			if (phdr->p_vaddr + phdr->p_memsz <= cstart ||
+			    phdr->p_vaddr >= cend)
+				continue;
+
+			printf("SRM console and kernel image would overlap.\n"
+			    "Please report this to <alpha@openbsd.org>, "
+			    "with the following values:\n"
+			    "SRM range: %p-%p\n"
+			    "kernel range: %p-%p\n",
+			    cstart, cend, phdr->p_vaddr,
+			    phdr->p_vaddr + phdr->p_memsz);
+			return 1;
+		}
+	}
+
+	return 0;
+}