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#ifndef __VGABIOS_H
#define __VGABIOS_H
#include "config.h" // CONFIG_VGA_EMULATE_TEXT
#include "farptr.h" // GET_FARVAR
#include "types.h" // u8
// Save/Restore flags
#define SR_HARDWARE 0x0001
#define SR_BDA 0x0002
#define SR_DAC 0x0004
#define SR_REGISTERS 0x0008
#define SR_SAVE 0x0100
#define SR_RESTORE 0x0200
// Mode flags
#define MF_LEGACY 0x0001
#define MF_GRAYSUM 0x0002
#define MF_NOPALETTE 0x0008
#define MF_CUSTOMCRTC 0x0800
#define MF_LINEARFB 0x4000
#define MF_NOCLEARMEM 0x8000
#define MF_VBEFLAGS 0xfe00
// Memory model types
#define MM_TEXT 0x00
#define MM_CGA 0x01
#define MM_HERCULES 0x02
#define MM_PLANAR 0x03
#define MM_PACKED 0x04
#define MM_NON_CHAIN_4_256 0x05
#define MM_DIRECT 0x06
#define MM_YUV 0x07
struct vgamode_s {
u8 memmodel;
u16 width;
u16 height;
u8 depth;
u8 cwidth;
u8 cheight;
u16 sstart;
};
// Custom internal storage in BDA (don't change here without also
// updating vgaentry.S)
#define VGA_CUSTOM_BDA 0xb9
struct vga_bda_s {
u8 flags;
u16 vbe_mode;
u16 vgamode_offset;
} PACKED;
#define BF_PM_MASK 0x0f
#define BF_EMULATE_TEXT 0x10
#define BF_SWCURSOR 0x20
#define BF_EXTRA_STACK 0x40
#define GET_BDA_EXT(var) \
GET_FARVAR(SEG_BDA, ((struct vga_bda_s *)VGA_CUSTOM_BDA)->var)
#define SET_BDA_EXT(var, val) \
SET_FARVAR(SEG_BDA, ((struct vga_bda_s *)VGA_CUSTOM_BDA)->var, (val))
#define MASK_BDA_EXT(var, off, on) \
SET_BDA_EXT(var, (GET_BDA_EXT(var) & ~(off)) | (on))
static inline int vga_emulate_text(void) {
return CONFIG_VGA_EMULATE_TEXT && GET_BDA_EXT(flags) & BF_EMULATE_TEXT;
}
// Write to global variables (during "post" phase only)
#define SET_VGA(var, val) SET_FARVAR(get_global_seg(), (var), (val))
// Debug settings
#define DEBUG_VGA_POST 1
#define DEBUG_VGA_10 9
// vgabios.c
int vga_bpp(struct vgamode_s *vmode_g);
u16 calc_page_size(u8 memmodel, u16 width, u16 height);
u16 get_cursor_shape(void);
struct cursorpos get_cursor_pos(u8 page);
int bda_save_restore(int cmd, u16 seg, void *data);
struct vgamode_s *get_current_mode(void);
int vga_set_mode(int mode, int flags);
extern struct video_func_static static_functionality;
#endif // vgabios.h
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