/* ----------------------------------------------------------------------- *
 *
 *   Copyright 1999-2008 H. Peter Anvin - All Rights Reserved
 *
 *   Permission is hereby granted, free of charge, to any person
 *   obtaining a copy of this software and associated documentation
 *   files (the "Software"), to deal in the Software without
 *   restriction, including without limitation the rights to use,
 *   copy, modify, merge, publish, distribute, sublicense, and/or
 *   sell copies of the Software, and to permit persons to whom
 *   the Software is furnished to do so, subject to the following
 *   conditions:
 *
 *   The above copyright notice and this permission notice shall
 *   be included in all copies or substantial portions of the Software.
 *
 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *   OTHER DEALINGS IN THE SOFTWARE.
 *
 * ----------------------------------------------------------------------- */

#ifndef LIB_SYS_VESA_H
#define LIB_SYS_VESA_H

#include <inttypes.h>
#include <com32.h>

/* VESA General Information table */
struct vesa_general_info {
  uint32_t  signature;		/* Magic number = "VESA" */
  uint16_t  version;
  far_ptr_t vendor_string;
  uint8_t   capabilities[4];
  far_ptr_t video_mode_ptr;
  uint16_t  total_memory;

  uint16_t  oem_software_rev;
  far_ptr_t oem_vendor_name_ptr;
  far_ptr_t oem_product_name_ptr;
  far_ptr_t oem_product_rev_ptr;

  uint8_t   reserved[222];
  uint8_t   oem_data[256];
} __attribute__((packed));

#define VESA_MAGIC ('V' + ('E' << 8) + ('S' << 16) + ('A' << 24))
#define VBE2_MAGIC ('V' + ('B' << 8) + ('E' << 16) + ('2' << 24))

struct vesa_mode_info {
  uint16_t  mode_attr;
  uint8_t   win_attr[2];
  uint16_t  win_grain;
  uint16_t  win_size;
  uint16_t  win_seg[2];
  far_ptr_t win_scheme;
  uint16_t  logical_scan;

  uint16_t  h_res;
  uint16_t  v_res;
  uint8_t   char_width;
  uint8_t   char_height;
  uint8_t   memory_planes;
  uint8_t   bpp;
  uint8_t   banks;
  uint8_t   memory_layout;
  uint8_t   bank_size;
  uint8_t   image_pages;
  uint8_t   page_function;

  uint8_t   rmask;
  uint8_t   rpos;
  uint8_t   gmask;
  uint8_t   gpos;
  uint8_t   bmask;
  uint8_t   bpos;
  uint8_t   resv_mask;
  uint8_t   resv_pos;
  uint8_t   dcm_info;

  uint8_t  *lfb_ptr;		/* Linear frame buffer address */
  uint8_t  *offscreen_ptr;	/* Offscreen memory address */
  uint16_t  offscreen_size;

  uint8_t   reserved[206];
} __attribute__((packed));

struct vesa_info {
  struct vesa_general_info gi;
  struct vesa_mode_info    mi;
};

extern struct vesa_info __vesa_info;

#if 0
static inline void vesa_debug(uint32_t color, int pos)
{
  uint32_t *stp = (uint32_t *)__vesa_info.mi.lfb_ptr;
  stp[pos*3] = color;
}
#else
static inline void vesa_debug(uint32_t color, int pos)
{
  (void)color; (void)pos;
}
#endif

#endif /* LIB_SYS_VESA_H */
