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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machine.h (2795B)


      1/* SPDX-License-Identifier: GPL-2.0-or-later */
      2/*
      3 * Copyright (C) 2016 Imagination Technologies
      4 * Author: Paul Burton <paul.burton@mips.com>
      5 */
      6
      7#ifndef __MIPS_ASM_MACHINE_H__
      8#define __MIPS_ASM_MACHINE_H__
      9
     10#include <linux/libfdt.h>
     11#include <linux/of.h>
     12
     13struct mips_machine {
     14	const struct of_device_id *matches;
     15	const void *fdt;
     16	bool (*detect)(void);
     17	const void *(*fixup_fdt)(const void *fdt, const void *match_data);
     18	unsigned int (*measure_hpt_freq)(void);
     19};
     20
     21extern long __mips_machines_start;
     22extern long __mips_machines_end;
     23
     24#define MIPS_MACHINE(name)						\
     25	static const struct mips_machine __mips_mach_##name		\
     26		__used __section(".mips.machines.init")
     27
     28#define for_each_mips_machine(mach)					\
     29	for ((mach) = (struct mips_machine *)&__mips_machines_start;	\
     30	     (mach) < (struct mips_machine *)&__mips_machines_end;	\
     31	     (mach)++)
     32
     33/**
     34 * mips_machine_is_compatible() - check if a machine is compatible with an FDT
     35 * @mach: the machine struct to check
     36 * @fdt: the FDT to check for compatibility with
     37 *
     38 * Check whether the given machine @mach is compatible with the given flattened
     39 * device tree @fdt, based upon the compatibility property of the root node.
     40 *
     41 * Return: the device id matched if any, else NULL
     42 */
     43static inline const struct of_device_id *
     44mips_machine_is_compatible(const struct mips_machine *mach, const void *fdt)
     45{
     46	const struct of_device_id *match;
     47
     48	if (!mach->matches)
     49		return NULL;
     50
     51	for (match = mach->matches; match->compatible[0]; match++) {
     52		if (fdt_node_check_compatible(fdt, 0, match->compatible) == 0)
     53			return match;
     54	}
     55
     56	return NULL;
     57}
     58
     59/**
     60 * struct mips_fdt_fixup - Describe a fixup to apply to an FDT
     61 * @apply: applies the fixup to @fdt, returns zero on success else -errno
     62 * @description: a short description of the fixup
     63 *
     64 * Describes a fixup applied to an FDT blob by the @apply function. The
     65 * @description field provides a short description of the fixup intended for
     66 * use in error messages if the @apply function returns non-zero.
     67 */
     68struct mips_fdt_fixup {
     69	int (*apply)(void *fdt);
     70	const char *description;
     71};
     72
     73/**
     74 * apply_mips_fdt_fixups() - apply fixups to an FDT blob
     75 * @fdt_out: buffer in which to place the fixed-up FDT
     76 * @fdt_out_size: the size of the @fdt_out buffer
     77 * @fdt_in: the FDT blob
     78 * @fixups: pointer to an array of fixups to be applied
     79 *
     80 * Loop through the array of fixups pointed to by @fixups, calling the apply
     81 * function on each until either one returns an error or we reach the end of
     82 * the list as indicated by an entry with a NULL apply field.
     83 *
     84 * Return: zero on success, else -errno
     85 */
     86extern int __init apply_mips_fdt_fixups(void *fdt_out, size_t fdt_out_size,
     87					const void *fdt_in,
     88					const struct mips_fdt_fixup *fixups);
     89
     90#endif /* __MIPS_ASM_MACHINE_H__ */