91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* coreboot.h
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*
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* Coreboot device and driver interfaces.
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*
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* Copyright 2014 Gerd Hoffmann <kraxel@redhat.com>
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* Copyright 2017 Google Inc.
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* Copyright 2017 Samuel Holland <samuel@sholland.org>
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*/
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#ifndef _LINUX_COREBOOT_H
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#define _LINUX_COREBOOT_H
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#include <linux/compiler_attributes.h>
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#include <linux/stddef.h>
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#include <linux/types.h>
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typedef __aligned(4) u64 cb_u64;
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/* List of coreboot entry structures that is used */
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#define CB_TAG_FRAMEBUFFER 0x12
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#define LB_TAG_CBMEM_ENTRY 0x31
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/* Generic */
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struct coreboot_table_entry {
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u32 tag;
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u32 size;
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};
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/* Points to a CBMEM entry */
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struct lb_cbmem_ref {
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u32 tag;
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u32 size;
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cb_u64 cbmem_addr;
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};
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/* Corresponds to LB_TAG_CBMEM_ENTRY */
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struct lb_cbmem_entry {
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u32 tag;
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u32 size;
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cb_u64 address;
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u32 entry_size;
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u32 id;
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};
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#define LB_FRAMEBUFFER_ORIENTATION_NORMAL 0
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#define LB_FRAMEBUFFER_ORIENTATION_BOTTOM_UP 1
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#define LB_FRAMEBUFFER_ORIENTATION_LEFT_UP 2
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#define LB_FRAMEBUFFER_ORIENTATION_RIGHT_UP 3
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/* Describes framebuffer setup by coreboot */
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struct lb_framebuffer {
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u32 tag;
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u32 size;
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cb_u64 physical_address;
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u32 x_resolution;
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u32 y_resolution;
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u32 bytes_per_line;
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u8 bits_per_pixel;
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u8 red_mask_pos;
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u8 red_mask_size;
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u8 green_mask_pos;
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u8 green_mask_size;
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u8 blue_mask_pos;
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u8 blue_mask_size;
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u8 reserved_mask_pos;
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u8 reserved_mask_size;
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u8 orientation;
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};
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/*
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* True if the coreboot-provided data is large enough to hold information
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* on the linear framebuffer. False otherwise.
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*/
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#define LB_FRAMEBUFFER_HAS_LFB(__fb) \
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((__fb)->size >= offsetofend(struct lb_framebuffer, reserved_mask_size))
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/*
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* True if the coreboot-provided data is large enough to hold information
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* on the display orientation. False otherwise.
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*/
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#define LB_FRAMEBUFFER_HAS_ORIENTATION(__fb) \
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((__fb)->size >= offsetofend(struct lb_framebuffer, orientation))
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#endif /* _LINUX_COREBOOT_H */
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