89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
#ifndef __VGABIOS_H
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#define __VGABIOS_H
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#include "config.h" // CONFIG_VGA_EMULATE_TEXT
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#include "farptr.h" // GET_FARVAR
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#include "types.h" // u8
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// Save/Restore flags
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#define SR_HARDWARE 0x0001
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#define SR_BDA 0x0002
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#define SR_DAC 0x0004
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#define SR_REGISTERS 0x0008
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#define SR_SAVE 0x0100
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#define SR_RESTORE 0x0200
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// Mode flags
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#define MF_LEGACY 0x0001
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#define MF_GRAYSUM 0x0002
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#define MF_NOPALETTE 0x0008
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#define MF_CUSTOMCRTC 0x0800
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#define MF_LINEARFB 0x4000
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#define MF_NOCLEARMEM 0x8000
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#define MF_VBEFLAGS 0xfe00
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// Memory model types
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#define MM_TEXT 0x00
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#define MM_CGA 0x01
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#define MM_HERCULES 0x02
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#define MM_PLANAR 0x03
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#define MM_PACKED 0x04
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#define MM_NON_CHAIN_4_256 0x05
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#define MM_DIRECT 0x06
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#define MM_YUV 0x07
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struct vgamode_s {
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u8 memmodel;
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u16 width;
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u16 height;
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u8 depth;
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u8 cwidth;
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u8 cheight;
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u16 sstart;
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};
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// Custom internal storage in BDA (don't change here without also
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// updating vgaentry.S)
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#define VGA_CUSTOM_BDA 0xb9
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struct vga_bda_s {
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u8 flags;
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u16 vbe_mode;
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u16 vgamode_offset;
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} PACKED;
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#define BF_PM_MASK 0x0f
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#define BF_EMULATE_TEXT 0x10
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#define BF_SWCURSOR 0x20
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#define BF_EXTRA_STACK 0x40
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#define GET_BDA_EXT(var) \
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GET_FARVAR(SEG_BDA, ((struct vga_bda_s *)VGA_CUSTOM_BDA)->var)
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#define SET_BDA_EXT(var, val) \
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SET_FARVAR(SEG_BDA, ((struct vga_bda_s *)VGA_CUSTOM_BDA)->var, (val))
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#define MASK_BDA_EXT(var, off, on) \
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SET_BDA_EXT(var, (GET_BDA_EXT(var) & ~(off)) | (on))
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static inline int vga_emulate_text(void) {
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return CONFIG_VGA_EMULATE_TEXT && GET_BDA_EXT(flags) & BF_EMULATE_TEXT;
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}
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// Write to global variables (during "post" phase only)
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#define SET_VGA(var, val) SET_FARVAR(get_global_seg(), (var), (val))
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// Debug settings
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#define DEBUG_VGA_POST 1
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#define DEBUG_VGA_10 3
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// vgabios.c
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int vga_bpp(struct vgamode_s *vmode_g);
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u16 calc_page_size(u8 memmodel, u16 width, u16 height);
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u16 get_cursor_shape(void);
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struct cursorpos get_cursor_pos(u8 page);
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int bda_save_restore(int cmd, u16 seg, void *data);
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struct vgamode_s *get_current_mode(void);
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int vga_set_mode(int mode, int flags);
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extern struct video_func_static static_functionality;
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#endif // vgabios.h
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