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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coreboot_table.h (2269B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/*
      3 * coreboot_table.h
      4 *
      5 * Internal header for coreboot table access.
      6 *
      7 * Copyright 2014 Gerd Hoffmann <kraxel@redhat.com>
      8 * Copyright 2017 Google Inc.
      9 * Copyright 2017 Samuel Holland <samuel@sholland.org>
     10 */
     11
     12#ifndef __COREBOOT_TABLE_H
     13#define __COREBOOT_TABLE_H
     14
     15#include <linux/device.h>
     16
     17/* Coreboot table header structure */
     18struct coreboot_table_header {
     19	char signature[4];
     20	u32 header_bytes;
     21	u32 header_checksum;
     22	u32 table_bytes;
     23	u32 table_checksum;
     24	u32 table_entries;
     25};
     26
     27/* List of coreboot entry structures that is used */
     28/* Generic */
     29struct coreboot_table_entry {
     30	u32 tag;
     31	u32 size;
     32};
     33
     34/* Points to a CBMEM entry */
     35struct lb_cbmem_ref {
     36	u32 tag;
     37	u32 size;
     38
     39	u64 cbmem_addr;
     40};
     41
     42/* Describes framebuffer setup by coreboot */
     43struct lb_framebuffer {
     44	u32 tag;
     45	u32 size;
     46
     47	u64 physical_address;
     48	u32 x_resolution;
     49	u32 y_resolution;
     50	u32 bytes_per_line;
     51	u8  bits_per_pixel;
     52	u8  red_mask_pos;
     53	u8  red_mask_size;
     54	u8  green_mask_pos;
     55	u8  green_mask_size;
     56	u8  blue_mask_pos;
     57	u8  blue_mask_size;
     58	u8  reserved_mask_pos;
     59	u8  reserved_mask_size;
     60};
     61
     62/* A device, additionally with information from coreboot. */
     63struct coreboot_device {
     64	struct device dev;
     65	union {
     66		struct coreboot_table_entry entry;
     67		struct lb_cbmem_ref cbmem_ref;
     68		struct lb_framebuffer framebuffer;
     69	};
     70};
     71
     72/* A driver for handling devices described in coreboot tables. */
     73struct coreboot_driver {
     74	int (*probe)(struct coreboot_device *);
     75	void (*remove)(struct coreboot_device *);
     76	struct device_driver drv;
     77	u32 tag;
     78};
     79
     80/* Register a driver that uses the data from a coreboot table. */
     81int coreboot_driver_register(struct coreboot_driver *driver);
     82
     83/* Unregister a driver that uses the data from a coreboot table. */
     84void coreboot_driver_unregister(struct coreboot_driver *driver);
     85
     86/* module_coreboot_driver() - Helper macro for drivers that don't do
     87 * anything special in module init/exit.  This eliminates a lot of
     88 * boilerplate.  Each module may only use this macro once, and
     89 * calling it replaces module_init() and module_exit()
     90 */
     91#define module_coreboot_driver(__coreboot_driver) \
     92	module_driver(__coreboot_driver, coreboot_driver_register, \
     93			coreboot_driver_unregister)
     94
     95#endif /* __COREBOOT_TABLE_H */