add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/boot/main.c
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@@ -1,12 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright (C) Paul Mackerras 1997.
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  *
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  * Updates for PPC64 by Todd Inglett, Dave Engebretsen & Peter Bergner.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version
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- * 2 of the License, or (at your option) any later version.
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  */
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 #include <stdarg.h>
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 #include <stddef.h>
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@@ -108,7 +104,7 @@
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 {
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 	/* If we have an image attached to us, it overrides anything
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 	 * supplied by the loader. */
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-	if (_initrd_end > _initrd_start) {
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+	if (&_initrd_end > &_initrd_start) {
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 		printf("Attached initrd image at 0x%p-0x%p\n\r",
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 		       _initrd_start, _initrd_end);
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 		initrd_addr = (unsigned long)_initrd_start;
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@@ -149,6 +145,46 @@
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 	return (struct addr_range){(void *)initrd_addr, initrd_size};
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 }
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+
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+#ifdef __powerpc64__
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+static void prep_esm_blob(struct addr_range vmlinux, void *chosen)
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+{
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+	unsigned long esm_blob_addr, esm_blob_size;
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+
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+	/* Do we have an ESM (Enter Secure Mode) blob? */
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+	if (&_esm_blob_end <= &_esm_blob_start)
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+		return;
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+
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+	printf("Attached ESM blob at 0x%p-0x%p\n\r",
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+	       _esm_blob_start, _esm_blob_end);
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+	esm_blob_addr = (unsigned long)_esm_blob_start;
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+	esm_blob_size = _esm_blob_end - _esm_blob_start;
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+
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+	/*
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+	 * If the ESM blob is too low it will be clobbered when the
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+	 * kernel relocates to its final location.  In this case,
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+	 * allocate a safer place and move it.
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+	 */
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+	if (esm_blob_addr < vmlinux.size) {
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+		void *old_addr = (void *)esm_blob_addr;
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+
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+		printf("Allocating 0x%lx bytes for esm_blob ...\n\r",
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+		       esm_blob_size);
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+		esm_blob_addr = (unsigned long)malloc(esm_blob_size);
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+		if (!esm_blob_addr)
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+			fatal("Can't allocate memory for ESM blob !\n\r");
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+		printf("Relocating ESM blob 0x%lx <- 0x%p (0x%lx bytes)\n\r",
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+		       esm_blob_addr, old_addr, esm_blob_size);
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+		memmove((void *)esm_blob_addr, old_addr, esm_blob_size);
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+	}
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+
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+	/* Tell the kernel ESM blob address via device tree. */
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+	setprop_val(chosen, "linux,esm-blob-start", (u32)(esm_blob_addr));
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+	setprop_val(chosen, "linux,esm-blob-end", (u32)(esm_blob_addr + esm_blob_size));
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+}
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+#else
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+static inline void prep_esm_blob(struct addr_range vmlinux, void *chosen) { }
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+#endif
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 /* A buffer that may be edited by tools operating on a zImage binary so as to
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  * edit the command line passed to vmlinux (by setting /chosen/bootargs).
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@@ -218,6 +254,7 @@
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 	vmlinux = prep_kernel();
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 	initrd = prep_initrd(vmlinux, chosen,
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 			     loader_info.initrd_addr, loader_info.initrd_size);
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+	prep_esm_blob(vmlinux, chosen);
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 	prep_cmdline(chosen);
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 	printf("Finalizing device tree...");