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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | /* SPDX-License-Identifier: GPL-2.0-only */ /* * coreboot_table.h * * Internal header for coreboot table access. * * Copyright 2014 Gerd Hoffmann <kraxel@redhat.com> * Copyright 2017 Google Inc. * Copyright 2017 Samuel Holland <samuel@sholland.org> */ #ifndef __COREBOOT_TABLE_H #define __COREBOOT_TABLE_H #include <linux/device.h> /* Coreboot table header structure */ struct coreboot_table_header { char signature[4]; u32 header_bytes; u32 header_checksum; u32 table_bytes; u32 table_checksum; u32 table_entries; }; /* List of coreboot entry structures that is used */ /* Generic */ struct coreboot_table_entry { u32 tag; u32 size; }; /* Points to a CBMEM entry */ struct lb_cbmem_ref { u32 tag; u32 size; u64 cbmem_addr; }; #define LB_TAG_CBMEM_ENTRY 0x31 /* Corresponds to LB_TAG_CBMEM_ENTRY */ struct lb_cbmem_entry { u32 tag; u32 size; u64 address; u32 entry_size; u32 id; }; /* Describes framebuffer setup by coreboot */ struct lb_framebuffer { u32 tag; u32 size; u64 physical_address; u32 x_resolution; u32 y_resolution; u32 bytes_per_line; u8 bits_per_pixel; u8 red_mask_pos; u8 red_mask_size; u8 green_mask_pos; u8 green_mask_size; u8 blue_mask_pos; u8 blue_mask_size; u8 reserved_mask_pos; u8 reserved_mask_size; }; /* A device, additionally with information from coreboot. */ struct coreboot_device { struct device dev; union { struct coreboot_table_entry entry; struct lb_cbmem_ref cbmem_ref; struct lb_cbmem_entry cbmem_entry; struct lb_framebuffer framebuffer; DECLARE_FLEX_ARRAY(u8, raw); }; }; static inline struct coreboot_device *dev_to_coreboot_device(struct device *dev) { return container_of(dev, struct coreboot_device, dev); } /* A driver for handling devices described in coreboot tables. */ struct coreboot_driver { int (*probe)(struct coreboot_device *); void (*remove)(struct coreboot_device *); struct device_driver drv; u32 tag; }; /* Register a driver that uses the data from a coreboot table. */ int coreboot_driver_register(struct coreboot_driver *driver); /* Unregister a driver that uses the data from a coreboot table. */ void coreboot_driver_unregister(struct coreboot_driver *driver); /* module_coreboot_driver() - Helper macro for drivers that don't do * anything special in module init/exit. This eliminates a lot of * boilerplate. Each module may only use this macro once, and * calling it replaces module_init() and module_exit() */ #define module_coreboot_driver(__coreboot_driver) \ module_driver(__coreboot_driver, coreboot_driver_register, \ coreboot_driver_unregister) #endif /* __COREBOOT_TABLE_H */ |