cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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pstore_ram.h (3907B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * Copyright (C) 2010 Marco Stornelli <marco.stornelli@gmail.com>
      4 * Copyright (C) 2011 Kees Cook <keescook@chromium.org>
      5 * Copyright (C) 2011 Google, Inc.
      6 */
      7
      8#ifndef __LINUX_PSTORE_RAM_H__
      9#define __LINUX_PSTORE_RAM_H__
     10
     11#include <linux/compiler.h>
     12#include <linux/device.h>
     13#include <linux/init.h>
     14#include <linux/kernel.h>
     15#include <linux/list.h>
     16#include <linux/pstore.h>
     17#include <linux/types.h>
     18
     19/*
     20 * Choose whether access to the RAM zone requires locking or not.  If a zone
     21 * can be written to from different CPUs like with ftrace for example, then
     22 * PRZ_FLAG_NO_LOCK is used. For all other cases, locking is required.
     23 */
     24#define PRZ_FLAG_NO_LOCK	BIT(0)
     25/*
     26 * If a PRZ should only have a single-boot lifetime, this marks it as
     27 * getting wiped after its contents get copied out after boot.
     28 */
     29#define PRZ_FLAG_ZAP_OLD	BIT(1)
     30
     31struct persistent_ram_buffer;
     32struct rs_control;
     33
     34struct persistent_ram_ecc_info {
     35	int block_size;
     36	int ecc_size;
     37	int symsize;
     38	int poly;
     39	uint16_t *par;
     40};
     41
     42/**
     43 * struct persistent_ram_zone - Details of a persistent RAM zone (PRZ)
     44 *                              used as a pstore backend
     45 *
     46 * @paddr:	physical address of the mapped RAM area
     47 * @size:	size of mapping
     48 * @label:	unique name of this PRZ
     49 * @type:	frontend type for this PRZ
     50 * @flags:	holds PRZ_FLAGS_* bits
     51 *
     52 * @buffer_lock:
     53 *	locks access to @buffer "size" bytes and "start" offset
     54 * @buffer:
     55 *	pointer to actual RAM area managed by this PRZ
     56 * @buffer_size:
     57 *	bytes in @buffer->data (not including any trailing ECC bytes)
     58 *
     59 * @par_buffer:
     60 *	pointer into @buffer->data containing ECC bytes for @buffer->data
     61 * @par_header:
     62 *	pointer into @buffer->data containing ECC bytes for @buffer header
     63 *	(i.e. all fields up to @data)
     64 * @rs_decoder:
     65 *	RSLIB instance for doing ECC calculations
     66 * @corrected_bytes:
     67 *	ECC corrected bytes accounting since boot
     68 * @bad_blocks:
     69 *	ECC uncorrectable bytes accounting since boot
     70 * @ecc_info:
     71 *	ECC configuration details
     72 *
     73 * @old_log:
     74 *	saved copy of @buffer->data prior to most recent wipe
     75 * @old_log_size:
     76 *	bytes contained in @old_log
     77 *
     78 */
     79struct persistent_ram_zone {
     80	phys_addr_t paddr;
     81	size_t size;
     82	void *vaddr;
     83	char *label;
     84	enum pstore_type_id type;
     85	u32 flags;
     86
     87	raw_spinlock_t buffer_lock;
     88	struct persistent_ram_buffer *buffer;
     89	size_t buffer_size;
     90
     91	char *par_buffer;
     92	char *par_header;
     93	struct rs_control *rs_decoder;
     94	int corrected_bytes;
     95	int bad_blocks;
     96	struct persistent_ram_ecc_info ecc_info;
     97
     98	char *old_log;
     99	size_t old_log_size;
    100};
    101
    102struct persistent_ram_zone *persistent_ram_new(phys_addr_t start, size_t size,
    103			u32 sig, struct persistent_ram_ecc_info *ecc_info,
    104			unsigned int memtype, u32 flags, char *label);
    105void persistent_ram_free(struct persistent_ram_zone *prz);
    106void persistent_ram_zap(struct persistent_ram_zone *prz);
    107
    108int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
    109			 unsigned int count);
    110int persistent_ram_write_user(struct persistent_ram_zone *prz,
    111			      const void __user *s, unsigned int count);
    112
    113void persistent_ram_save_old(struct persistent_ram_zone *prz);
    114size_t persistent_ram_old_size(struct persistent_ram_zone *prz);
    115void *persistent_ram_old(struct persistent_ram_zone *prz);
    116void persistent_ram_free_old(struct persistent_ram_zone *prz);
    117ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
    118	char *str, size_t len);
    119
    120/*
    121 * Ramoops platform data
    122 * @mem_size	memory size for ramoops
    123 * @mem_address	physical memory address to contain ramoops
    124 */
    125
    126#define RAMOOPS_FLAG_FTRACE_PER_CPU	BIT(0)
    127
    128struct ramoops_platform_data {
    129	unsigned long	mem_size;
    130	phys_addr_t	mem_address;
    131	unsigned int	mem_type;
    132	unsigned long	record_size;
    133	unsigned long	console_size;
    134	unsigned long	ftrace_size;
    135	unsigned long	pmsg_size;
    136	int		max_reason;
    137	u32		flags;
    138	struct persistent_ram_ecc_info ecc_info;
    139};
    140
    141#endif