linux-kernel - [PATCH 06/36] fdt: Add generic dt_memblock

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Date:	Fri,  6 Jul 2012 22:05:47 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: [PATCH 06/36] fdt: Add generic dt_memblock_reserve() function

This function reserves initial_boot_params total size and reserve map.

Signed-off-by: Catalin Marinas <catalin.marinas@....com>
Cc: Grant Likely <grant.likely@...retlab.ca>
---
 drivers/of/fdt.c       |   28 ++++++++++++++++++++++++++++
 include/linux/of_fdt.h |    1 +
 2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 91a375f..7e9b5b0 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -17,6 +17,7 @@
 #include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/slab.h>
+#include <linux/memblock.h>
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #ifdef CONFIG_PPC
@@ -436,6 +437,33 @@ int __initdata dt_root_size_cells;
 
 struct boot_param_header *initial_boot_params;
 
+void __init dt_memblock_reserve(void)
+{
+	u64 *reserve_map, base, size;
+
+	if (!initial_boot_params)
+		return;
+
+	/* Reserve the dtb region */
+	memblock_reserve(virt_to_phys(initial_boot_params),
+			 be32_to_cpu(initial_boot_params->totalsize));
+
+	/*
+	 * Process the reserve map.  This will probably overlap the initrd
+	 * and dtb locations which are already reserved, but overlapping
+	 * doesn't hurt anything
+	 */
+	reserve_map = ((void*)initial_boot_params) +
+			be32_to_cpu(initial_boot_params->off_mem_rsvmap);
+	while (1) {
+		base = be64_to_cpup(reserve_map++);
+		size = be64_to_cpup(reserve_map++);
+		if (!size)
+			break;
+		memblock_reserve(base, size);
+	}
+}
+
 #ifdef CONFIG_OF_EARLY_FLATTREE
 
 /**
diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h
index ed136ad..bf4fe1e 100644
--- a/include/linux/of_fdt.h
+++ b/include/linux/of_fdt.h
@@ -117,6 +117,7 @@ extern int early_init_dt_scan_root(unsigned long node, const char *uname,
 /* Other Prototypes */
 extern void unflatten_device_tree(void);
 extern void early_init_devtree(void *);
+extern void dt_memblock_reserve(void);
 #else /* CONFIG_OF_FLATTREE */
 static inline void unflatten_device_tree(void) {}
 #endif /* CONFIG_OF_FLATTREE */

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