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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bcm963xx_nvram.h (3036B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef __LINUX_BCM963XX_NVRAM_H__
      3#define __LINUX_BCM963XX_NVRAM_H__
      4
      5#include <linux/crc32.h>
      6#include <linux/if_ether.h>
      7#include <linux/sizes.h>
      8#include <linux/types.h>
      9
     10/*
     11 * Broadcom BCM963xx SoC board nvram data structure.
     12 *
     13 * The nvram structure varies in size depending on the SoC board version. Use
     14 * the appropriate minimum BCM963XX_NVRAM_*_SIZE define for the information
     15 * you need instead of sizeof(struct bcm963xx_nvram) as this may change.
     16 */
     17
     18#define BCM963XX_NVRAM_V4_SIZE		300
     19#define BCM963XX_NVRAM_V5_SIZE		(1 * SZ_1K)
     20
     21#define BCM963XX_DEFAULT_PSI_SIZE	64
     22
     23enum bcm963xx_nvram_nand_part {
     24	BCM963XX_NVRAM_NAND_PART_BOOT = 0,
     25	BCM963XX_NVRAM_NAND_PART_ROOTFS_1,
     26	BCM963XX_NVRAM_NAND_PART_ROOTFS_2,
     27	BCM963XX_NVRAM_NAND_PART_DATA,
     28	BCM963XX_NVRAM_NAND_PART_BBT,
     29
     30	__BCM963XX_NVRAM_NAND_NR_PARTS
     31};
     32
     33struct bcm963xx_nvram {
     34	u32	version;
     35	char	bootline[256];
     36	char	name[16];
     37	u32	main_tp_number;
     38	u32	psi_size;
     39	u32	mac_addr_count;
     40	u8	mac_addr_base[ETH_ALEN];
     41	u8	__reserved1[2];
     42	u32	checksum_v4;
     43
     44	u8	__reserved2[292];
     45	u32	nand_part_offset[__BCM963XX_NVRAM_NAND_NR_PARTS];
     46	u32	nand_part_size[__BCM963XX_NVRAM_NAND_NR_PARTS];
     47	u8	__reserved3[388];
     48	u32	checksum_v5;
     49};
     50
     51#define BCM963XX_NVRAM_NAND_PART_OFFSET(nvram, part) \
     52	bcm963xx_nvram_nand_part_offset(nvram, BCM963XX_NVRAM_NAND_PART_ ##part)
     53
     54static inline u64 __pure bcm963xx_nvram_nand_part_offset(
     55	const struct bcm963xx_nvram *nvram,
     56	enum bcm963xx_nvram_nand_part part)
     57{
     58	return nvram->nand_part_offset[part] * SZ_1K;
     59}
     60
     61#define BCM963XX_NVRAM_NAND_PART_SIZE(nvram, part) \
     62	bcm963xx_nvram_nand_part_size(nvram, BCM963XX_NVRAM_NAND_PART_ ##part)
     63
     64static inline u64 __pure bcm963xx_nvram_nand_part_size(
     65	const struct bcm963xx_nvram *nvram,
     66	enum bcm963xx_nvram_nand_part part)
     67{
     68	return nvram->nand_part_size[part] * SZ_1K;
     69}
     70
     71/*
     72 * bcm963xx_nvram_checksum - Verify nvram checksum
     73 *
     74 * @nvram: pointer to full size nvram data structure
     75 * @expected_out: optional pointer to store expected checksum value
     76 * @actual_out: optional pointer to store actual checksum value
     77 *
     78 * Return: 0 if the checksum is valid, otherwise -EINVAL
     79 */
     80static int __maybe_unused bcm963xx_nvram_checksum(
     81	const struct bcm963xx_nvram *nvram,
     82	u32 *expected_out, u32 *actual_out)
     83{
     84	u32 expected, actual;
     85	size_t len;
     86
     87	if (nvram->version <= 4) {
     88		expected = nvram->checksum_v4;
     89		len = BCM963XX_NVRAM_V4_SIZE - sizeof(u32);
     90	} else {
     91		expected = nvram->checksum_v5;
     92		len = BCM963XX_NVRAM_V5_SIZE - sizeof(u32);
     93	}
     94
     95	/*
     96	 * Calculate the CRC32 value for the nvram with a checksum value
     97	 * of 0 without modifying or copying the nvram by combining:
     98	 * - The CRC32 of the nvram without the checksum value
     99	 * - The CRC32 of a zero checksum value (which is also 0)
    100	 */
    101	actual = crc32_le_combine(
    102		crc32_le(~0, (u8 *)nvram, len), 0, sizeof(u32));
    103
    104	if (expected_out)
    105		*expected_out = expected;
    106
    107	if (actual_out)
    108		*actual_out = actual;
    109
    110	return expected == actual ? 0 : -EINVAL;
    111};
    112
    113#endif /* __LINUX_BCM963XX_NVRAM_H__ */