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// Simple framebuffer vgabios for use with coreboot native vga init.
//
// Copyright (C) 2014 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // GET_BDA
#include "cbvga.h" // cbvga_setup
#include "output.h" // dprintf
#include "stdvga.h" // SEG_CTEXT
#include "string.h" // memset16_far
#include "util.h" // find_cb_table
#include "vgabios.h" // VGAREG_*
static int CBmode VAR16;
static struct vgamode_s CBmodeinfo VAR16;
static u32 CBlinelength VAR16;
struct vgamode_s *cbvga_find_mode(int mode)
{
if (mode == GET_GLOBAL(CBmode))
return &CBmodeinfo;
return NULL;
}
void
cbvga_list_modes(u16 seg, u16 *dest, u16 *last)
{
if (dest<last) {
SET_FARVAR(seg, *dest, GET_GLOBAL(CBmode));
dest++;
}
SET_FARVAR(seg, *dest, 0xffff);
}
int
cbvga_get_window(struct vgamode_s *vmode_g, int window)
{
return -1;
}
int
cbvga_set_window(struct vgamode_s *vmode_g, int window, int val)
{
return -1;
}
int
cbvga_get_linelength(struct vgamode_s *vmode_g)
{
return GET_GLOBAL(CBlinelength);
}
int
cbvga_set_linelength(struct vgamode_s *vmode_g, int val)
{
return -1;
}
int
cbvga_get_displaystart(struct vgamode_s *vmode_g)
{
return 0;
}
int
cbvga_set_displaystart(struct vgamode_s *vmode_g, int val)
{
return -1;
}
int
cbvga_get_dacformat(struct vgamode_s *vmode_g)
{
return -1;
}
int
cbvga_set_dacformat(struct vgamode_s *vmode_g, int val)
{
return -1;
}
int
cbvga_save_restore(int cmd, u16 seg, void *data)
{
if (cmd & (SR_HARDWARE|SR_DAC|SR_REGISTERS))
return -1;
return bda_save_restore(cmd, seg, data);
}
int
cbvga_set_mode(struct vgamode_s *vmode_g, int flags)
{
if (!(flags & MF_NOCLEARMEM)) {
if (GET_GLOBAL(CBmodeinfo.memmodel) == MM_TEXT) {
memset16_far(SEG_CTEXT, (void*)0, 0x0720, 80*25*2);
return 0;
}
struct gfx_op op;
init_gfx_op(&op, vmode_g);
op.x = op.y = 0;
op.xlen = GET_GLOBAL(CBmodeinfo.width);
op.ylen = GET_GLOBAL(CBmodeinfo.height);
op.op = GO_MEMSET;
handle_gfx_op(&op);
}
return 0;
}
#define CB_TAG_FRAMEBUFFER 0x0012
struct cb_framebuffer {
u32 tag;
u32 size;
u64 physical_address;
u32 x_resolution;
u32 y_resolution;
u32 bytes_per_line;
u8 bits_per_pixel;
u8 red_mask_pos;
u8 red_mask_size;
u8 green_mask_pos;
u8 green_mask_size;
u8 blue_mask_pos;
u8 blue_mask_size;
u8 reserved_mask_pos;
u8 reserved_mask_size;
};
int
cbvga_setup(void)
{
dprintf(1, "coreboot vga init\n");
if (GET_GLOBAL(HaveRunInit))
return 0;
struct cb_header *cbh = find_cb_table();
if (!cbh) {
dprintf(1, "Unable to find coreboot table\n");
return -1;
}
struct cb_framebuffer *cbfb = find_cb_subtable(cbh, CB_TAG_FRAMEBUFFER);
if (!cbfb) {
// Assume there is an EGA text framebuffer.
dprintf(1, "Did not find coreboot framebuffer - assuming EGA text\n");
SET_VGA(CBmode, 0x03);
SET_VGA(CBlinelength, 80*2);
SET_VGA(CBmodeinfo.memmodel, MM_TEXT);
SET_VGA(CBmodeinfo.width, 80);
SET_VGA(CBmodeinfo.height, 25);
SET_VGA(CBmodeinfo.depth, 4);
SET_VGA(CBmodeinfo.cwidth, 9);
SET_VGA(CBmodeinfo.cheight, 16);
SET_VGA(CBmodeinfo.sstart, SEG_CTEXT);
return 0;
}
u64 addr = GET_FARVAR(0, cbfb->physical_address);
u8 bpp = GET_FARVAR(0, cbfb->bits_per_pixel);
u32 xlines = GET_FARVAR(0, cbfb->x_resolution);
u32 ylines = GET_FARVAR(0, cbfb->y_resolution);
u32 linelength = GET_FARVAR(0, cbfb->bytes_per_line);
dprintf(1, "Found FB @ %llx %dx%d with %d bpp (%d stride)\n"
, addr, xlines, ylines, bpp, linelength);
if (!addr || addr > 0xffffffff
|| (bpp != 15 && bpp != 16 && bpp != 24 && bpp != 32)) {
dprintf(1, "Unable to use FB\n");
return -1;
}
SET_VGA(CBmode, 0x140);
SET_VGA(VBE_framebuffer, addr);
SET_VGA(VBE_total_memory, linelength * ylines);
SET_VGA(CBlinelength, linelength);
SET_VGA(CBmodeinfo.memmodel, MM_DIRECT);
SET_VGA(CBmodeinfo.width, xlines);
SET_VGA(CBmodeinfo.height, ylines);
SET_VGA(CBmodeinfo.depth, bpp);
SET_VGA(CBmodeinfo.cwidth, 8);
SET_VGA(CBmodeinfo.cheight, 16);
// Setup BDA and clear screen.
vga_set_mode(GET_GLOBAL(CBmode), 0);
return 0;
}
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