136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _SCREEN_INFO_H
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#define _SCREEN_INFO_H
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#include <uapi/linux/screen_info.h>
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#include <linux/bits.h>
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/**
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* SCREEN_INFO_MAX_RESOURCES - maximum number of resources per screen_info
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*/
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#define SCREEN_INFO_MAX_RESOURCES 3
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struct pci_dev;
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struct resource;
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static inline bool __screen_info_has_lfb(unsigned int type)
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{
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return (type == VIDEO_TYPE_VLFB) || (type == VIDEO_TYPE_EFI);
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}
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static inline u64 __screen_info_lfb_base(const struct screen_info *si)
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{
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u64 lfb_base = si->lfb_base;
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if (si->capabilities & VIDEO_CAPABILITY_64BIT_BASE)
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lfb_base |= (u64)si->ext_lfb_base << 32;
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return lfb_base;
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}
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static inline void __screen_info_set_lfb_base(struct screen_info *si, u64 lfb_base)
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{
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si->lfb_base = lfb_base & GENMASK_ULL(31, 0);
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si->ext_lfb_base = (lfb_base & GENMASK_ULL(63, 32)) >> 32;
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if (si->ext_lfb_base)
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si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
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else
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si->capabilities &= ~VIDEO_CAPABILITY_64BIT_BASE;
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}
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static inline u64 __screen_info_lfb_size(const struct screen_info *si, unsigned int type)
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{
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u64 lfb_size = si->lfb_size;
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if (type == VIDEO_TYPE_VLFB)
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lfb_size <<= 16;
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return lfb_size;
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}
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static inline unsigned int __screen_info_video_type(unsigned int type)
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{
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switch (type) {
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case VIDEO_TYPE_MDA:
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case VIDEO_TYPE_CGA:
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case VIDEO_TYPE_EGAM:
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case VIDEO_TYPE_EGAC:
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case VIDEO_TYPE_VGAC:
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case VIDEO_TYPE_VLFB:
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case VIDEO_TYPE_PICA_S3:
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case VIDEO_TYPE_MIPS_G364:
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case VIDEO_TYPE_SGI:
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case VIDEO_TYPE_TGAC:
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case VIDEO_TYPE_SUN:
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case VIDEO_TYPE_SUNPCI:
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case VIDEO_TYPE_PMAC:
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case VIDEO_TYPE_EFI:
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return type;
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default:
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return 0;
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}
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}
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/**
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* screen_info_video_type() - Decodes the video type from struct screen_info
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* @si: an instance of struct screen_info
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*
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* Returns:
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* A VIDEO_TYPE_ constant representing si's type of video display, or 0 otherwise.
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*/
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static inline unsigned int screen_info_video_type(const struct screen_info *si)
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{
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unsigned int type;
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// check if display output is on
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if (!si->orig_video_isVGA)
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return 0;
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// check for a known VIDEO_TYPE_ constant
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type = __screen_info_video_type(si->orig_video_isVGA);
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if (type)
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return si->orig_video_isVGA;
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// check if text mode has been initialized
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if (!si->orig_video_lines || !si->orig_video_cols)
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return 0;
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// 80x25 text, mono
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if (si->orig_video_mode == 0x07) {
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if ((si->orig_video_ega_bx & 0xff) != 0x10)
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return VIDEO_TYPE_EGAM;
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else
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return VIDEO_TYPE_MDA;
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}
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// EGA/VGA, 16 colors
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if ((si->orig_video_ega_bx & 0xff) != 0x10) {
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if (si->orig_video_isVGA)
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return VIDEO_TYPE_VGAC;
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else
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return VIDEO_TYPE_EGAC;
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}
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// the rest...
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return VIDEO_TYPE_CGA;
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}
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ssize_t screen_info_resources(const struct screen_info *si, struct resource *r, size_t num);
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#if defined(CONFIG_PCI)
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void screen_info_apply_fixups(void);
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struct pci_dev *screen_info_pci_dev(const struct screen_info *si);
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#else
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static inline void screen_info_apply_fixups(void)
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{ }
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static inline struct pci_dev *screen_info_pci_dev(const struct screen_info *si)
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{
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return NULL;
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}
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#endif
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extern struct screen_info screen_info;
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#endif /* _SCREEN_INFO_H */
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