linux/include/video/uvesafb.h

#ifndef _UVESAFB_H
#define _UVESAFB_H

struct v86_regs {
	__u32 ebx;
	__u32 ecx;
	__u32 edx;
	__u32 esi;
	__u32 edi;
	__u32 ebp;
	__u32 eax;
	__u32 eip;
	__u32 eflags;
	__u32 esp;
	__u16 cs;
	__u16 ss;
	__u16 es;
	__u16 ds;
	__u16 fs;
	__u16 gs;
};

/* Task flags */
#define TF_VBEIB	0x01
#define TF_BUF_ESDI	0x02
#define TF_BUF_ESBX	0x04
#define TF_BUF_RET	0x08
#define TF_EXIT		0x10

struct uvesafb_task {
	__u8 flags;
	int buf_len;
	struct v86_regs regs;
};

/* Constants for the capabilities field
 * in vbe_ib */
#define VBE_CAP_CAN_SWITCH_DAC	0x01
#define VBE_CAP_VGACOMPAT	0x02

/* The VBE Info Block */
struct vbe_ib {
	char  vbe_signature[4];
	__u16 vbe_version;
	__u32 oem_string_ptr;
	__u32 capabilities;
	__u32 mode_list_ptr;
	__u16 total_memory;
	__u16 oem_software_rev;
	__u32 oem_vendor_name_ptr;
	__u32 oem_product_name_ptr;
	__u32 oem_product_rev_ptr;
	__u8  reserved[222];
	char  oem_data[256];
	char  misc_data[512];
} __attribute__ ((packed));

#ifdef __KERNEL__

/* VBE CRTC Info Block */
struct vbe_crtc_ib {
	u16 horiz_total;
	u16 horiz_start;
	u16 horiz_end;
	u16 vert_total;
	u16 vert_start;
	u16 vert_end;
	u8  flags;
	u32 pixel_clock;
	u16 refresh_rate;
	u8  reserved[40];
} __attribute__ ((packed));

#define VBE_MODE_VGACOMPAT	0x20
#define VBE_MODE_COLOR		0x08
#define VBE_MODE_SUPPORTEDHW	0x01
#define VBE_MODE_GRAPHICS	0x10
#define VBE_MODE_LFB		0x80

#define VBE_MODE_MASK		(VBE_MODE_COLOR | VBE_MODE_SUPPORTEDHW | \
				VBE_MODE_GRAPHICS | VBE_MODE_LFB)

/* VBE Mode Info Block */
struct vbe_mode_ib {
	/* for all VBE revisions */
	u16 mode_attr;
	u8  winA_attr;
	u8  winB_attr;
	u16 win_granularity;
	u16 win_size;
	u16 winA_seg;
	u16 winB_seg;
	u32 win_func_ptr;
	u16 bytes_per_scan_line;

	/* for VBE 1.2+ */
	u16 x_res;
	u16 y_res;
	u8  x_char_size;
	u8  y_char_size;
	u8  planes;
	u8  bits_per_pixel;
	u8  banks;
	u8  memory_model;
	u8  bank_size;
	u8  image_pages;
	u8  reserved1;

	/* Direct color fields for direct/6 and YUV/7 memory models. */
	/* Offsets are bit positions of lsb in the mask. */
	u8  red_len;
	u8  red_off;
	u8  green_len;
	u8  green_off;
	u8  blue_len;
	u8  blue_off;
	u8  rsvd_len;
	u8  rsvd_off;
	u8  direct_color_info;	/* direct color mode attributes */

	/* for VBE 2.0+ */
	u32 phys_base_ptr;
	u8  reserved2[6];

	/* for VBE 3.0+ */
	u16 lin_bytes_per_scan_line;
	u8  bnk_image_pages;
	u8  lin_image_pages;
	u8  lin_red_len;
	u8  lin_red_off;
	u8  lin_green_len;
	u8  lin_green_off;
	u8  lin_blue_len;
	u8  lin_blue_off;
	u8  lin_rsvd_len;
	u8  lin_rsvd_off;
	u32 max_pixel_clock;
	u16 mode_id;
	u8  depth;
} __attribute__ ((packed));

#define UVESAFB_DEFAULT_MODE "640x480-16"

/* How long to wait for a reply from userspace [ms] */
#define UVESAFB_TIMEOUT 5000

/* Max number of concurrent tasks */
#define UVESAFB_TASKS_MAX 16

#define dac_reg	(0x3c8)
#define dac_val	(0x3c9)

struct uvesafb_pal_entry {
	u_char blue, green, red, pad;
} __attribute__ ((packed));

struct uvesafb_ktask {
	struct uvesafb_task t;
	void *buf;
	struct completion *done;
	u32 ack;
};

static int uvesafb_exec(struct uvesafb_ktask *tsk);

#define UVESAFB_EXACT_RES	1
#define UVESAFB_EXACT_DEPTH	2

struct uvesafb_par {
	struct vbe_ib vbe_ib;		/* VBE Info Block */
	struct vbe_mode_ib *vbe_modes;	/* list of supported VBE modes */
	int vbe_modes_cnt;

	u8 nocrtc;
	u8 ypan;			/* 0 - nothing, 1 - ypan, 2 - ywrap */
	u8 pmi_setpal;			/* PMI for palette changes */
	u16 *pmi_base;			/* protected mode interface location */
	void *pmi_start;
	void *pmi_pal;
	u8 *vbe_state_orig;		/*
					 * original hardware state, before the
					 * driver was loaded
					 */
	u8 *vbe_state_saved;		/* state saved by fb_save_state */
	int vbe_state_size;
	atomic_t ref_count;

	int mode_idx;
	struct vbe_crtc_ib crtc;
};

#endif /* __KERNEL__ */
#endif /* _UVESAFB_H */