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#ifndef __VGABIOS_H
#define __VGABIOS_H
#include "types.h" // u8
#include "farptr.h" // struct segoff_s
// standard BIOS Video Parameter Table
struct VideoParam_s {
u8 twidth;
u8 theightm1;
u8 cheight;
u16 slength;
u8 sequ_regs[4];
u8 miscreg;
u8 crtc_regs[25];
u8 actl_regs[20];
u8 grdc_regs[9];
} PACKED;
extern struct VideoParam_s video_param_table[29];
struct saveBDAstate {
u16 video_mode;
u16 video_cols;
u16 video_pagesize;
u16 crtc_address;
u8 video_rows;
u16 char_height;
u8 video_ctl;
u8 video_switches;
u8 modeset_ctl;
u16 cursor_type;
u16 cursor_pos[8];
u16 video_pagestart;
u8 video_page;
/* current font */
struct segoff_s font0;
struct segoff_s font1;
};
// 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;
};
// vgafonts.c
extern u8 vgafont8[];
extern u8 vgafont14[];
extern u8 vgafont16[];
extern u8 vgafont14alt[];
extern u8 vgafont16alt[];
// Debug settings
#define DEBUG_VGA_POST 1
#define DEBUG_VGA_10 3
// vgabios.c
extern int VgaBDF;
extern int HaveRunInit;
#define SET_VGA(var, val) SET_FARVAR(get_global_seg(), (var), (val))
struct carattr {
u8 car, attr, use_attr, pad;
};
struct cursorpos {
u8 x, y, page, pad;
};
int vga_bpp(struct vgamode_s *vmode_g);
u16 calc_page_size(u8 memmodel, u16 width, u16 height);
void save_bda_state(u16 seg, struct saveBDAstate *info);
void restore_bda_state(u16 seg, struct saveBDAstate *info);
struct vgamode_s *get_current_mode(void);
int vga_set_mode(int mode, int flags);
// vgafb.c
void vgafb_scroll(int nblines, int attr
, struct cursorpos ul, struct cursorpos lr);
void vgafb_write_char(struct cursorpos cp, struct carattr ca);
struct carattr vgafb_read_char(struct cursorpos cp);
void vgafb_write_pixel(u8 color, u16 x, u16 y);
u8 vgafb_read_pixel(u16 x, u16 y);
// vbe.c
extern u32 VBE_total_memory;
extern u32 VBE_capabilities;
extern u32 VBE_framebuffer;
extern u16 VBE_win_granularity;
#define VBE_OEM_STRING "SeaBIOS VBE(C) 2011"
#define VBE_VENDOR_STRING "SeaBIOS Developers"
#define VBE_PRODUCT_STRING "SeaBIOS VBE Adapter"
#define VBE_REVISION_STRING "Rev. 1"
struct bregs;
void handle_104f(struct bregs *regs);
#endif // vgabios.h
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