staging: android: persistent_ram: Move to fs/pstore/ram_core.c

This is a first step for adding ECC support for pstore RAM backend: we
will use the persistent_ram routines, kindly provided by Google.

Basically, persistent_ram is a set of helper routines to deal with the
[optionally] ECC-protected persistent ram regions.

A bit of Makefile, Kconfig and header files adjustments were needed
because of the move.

Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 80 insertions, 0 deletions

diff --git a/include/linux/pstore_ram.h b/include/linux/pstore_ram.h
index fa4cb02da413..ffe24a52c5af 100644
--- a/include/linux/pstore_ram.h
+++ b/include/linux/pstore_ram.h
@@ -1,6 +1,86 @@
+/*
+ * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
+ * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
 #ifndef __LINUX_PSTORE_RAM_H__
 #define __LINUX_PSTORE_RAM_H__
 
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/init.h>
+
+struct persistent_ram_buffer;
+
+struct persistent_ram_descriptor {
+        const char      *name;
+        phys_addr_t     size;
+};
+
+struct persistent_ram {
+        phys_addr_t     start;
+        phys_addr_t     size;
+
+        int                                     num_descs;
+        struct persistent_ram_descriptor        *descs;
+
+        struct list_head node;
+};
+
+struct persistent_ram_zone {
+        phys_addr_t paddr;
+        size_t size;
+        void *vaddr;
+        struct persistent_ram_buffer *buffer;
+        size_t buffer_size;
+
+        /* ECC correction */
+        bool ecc;
+        char *par_buffer;
+        char *par_header;
+        struct rs_control *rs_decoder;
+        int corrected_bytes;
+        int bad_blocks;
+        int ecc_block_size;
+        int ecc_size;
+        int ecc_symsize;
+        int ecc_poly;
+
+        char *old_log;
+        size_t old_log_size;
+};
+
+int persistent_ram_early_init(struct persistent_ram *ram);
+
+struct persistent_ram_zone * __init persistent_ram_new(phys_addr_t start,
+                                                       size_t size,
+                                                       bool ecc);
+void persistent_ram_free(struct persistent_ram_zone *prz);
+struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
+                bool ecc);
+
+int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
+        unsigned int count);
+
+size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
+void *persistent_ram_old(struct persistent_ram_zone *prz);
+void persistent_ram_free_old(struct persistent_ram_zone *prz);
+ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
+        char *str, size_t len);
+
 /*
  * Ramoops platform data
  * @mem_size    memory size for ramoops