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seabios/vgasrc/cbvga.c

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// Simple framebuffer vgabios for use with coreboot native vga init.
//
// Copyright (C) 2014 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2017 Patrick Rudolph <siro@das-labor.org>
//
// This file may be distributed under the terms of the GNU LGPLv3 license.
#include "biosvar.h" // GET_BDA
#include "output.h" // dprintf
#include "stdvga.h" // SEG_CTEXT
#include "string.h" // memset16_far
#include "util.h" // find_cb_table
#include "vgabios.h" // SET_VGA
#include "vgafb.h" // handle_gfx_op
#include "vgautil.h" // VBE_total_memory
#include "svgamodes.h" // svga_modes
static int CBmode VAR16;
static struct vgamode_s CBmodeinfo VAR16;
static struct vgamode_s CBemulinfo VAR16;
static u32 CBlinelength VAR16;
struct vgamode_s *cbvga_find_mode(int mode)
{
if (mode == GET_GLOBAL(CBmode))
return &CBmodeinfo;
if (mode == 0x03)
return &CBemulinfo;
int i;
for (i = 0; i < GET_GLOBAL(svga_mcount); i++) {
struct generic_svga_mode *cbmode_g = &svga_modes[i];
if (GET_GLOBAL(cbmode_g->mode) == 0xffff)
continue;
if (GET_GLOBAL(cbmode_g->mode) == mode)
return &cbmode_g->info;
}
return NULL;
}
void
cbvga_list_modes(u16 seg, u16 *dest, u16 *last)
{
int seen = 0;
if (GET_GLOBAL(CBmode) != 0x3) {
/* Advertise additional SVGA modes for Microsoft NTLDR graphical mode.
* Microsoft NTLDR:
* + Graphical mode uses a maximum resolution of 1600x1200.
* + Expects to find VESA mode with 800x600 or 1024x768.
* + 24 Bpp and 32 Bpp are supported
*/
int i;
for (i = 0; i < GET_GLOBAL(svga_mcount) && dest < last; i++) {
struct generic_svga_mode *cbmode_g = &svga_modes[i];
u16 mode = GET_GLOBAL(cbmode_g->mode);
if (mode == 0xffff)
continue;
SET_FARVAR(seg, *dest, mode);
dest++;
if (GET_GLOBAL(CBmode) == mode)
seen = 1;
}
}
if (dest < last && !seen) {
SET_FARVAR(seg, *dest, GET_GLOBAL(CBmode));
dest++;
}
SET_FARVAR(seg, *dest, 0xffff);
}
int
cbvga_get_window(struct vgamode_s *curmode_g, int window)
{
return -1;
}
int
cbvga_set_window(struct vgamode_s *curmode_g, int window, int val)
{
return -1;
}
int
cbvga_minimum_linelength(struct vgamode_s *vmode_g)
{
/* Can't change mode, always report active pitch. */
return GET_GLOBAL(CBlinelength);
}
int
cbvga_get_linelength(struct vgamode_s *curmode_g)
{
return GET_GLOBAL(CBlinelength);
}
int
cbvga_set_linelength(struct vgamode_s *curmode_g, int val)
{
return -1;
}
int
cbvga_get_displaystart(struct vgamode_s *curmode_g)
{
return 0;
}
int
cbvga_set_displaystart(struct vgamode_s *curmode_g, int val)
{
return -1;
}
int
cbvga_get_dacformat(struct vgamode_s *curmode_g)
{
return -1;
}
int
cbvga_set_dacformat(struct vgamode_s *curmode_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)
{
u8 emul = vmode_g == &CBemulinfo || GET_GLOBAL(CBmode) == 0x03;
/*
* The extra_stack flag is false when running in windows x86
* emulator, to avoid stack switching triggering bugs. Using the
* same flag here to skip screen clearing, because the windows
* emulator seems to have problems to handle the int 1587 call
* too, and GO_MEMSET uses that.
*/
u8 extra_stack = GET_BDA_EXT(flags) & BF_EXTRA_STACK;
MASK_BDA_EXT(flags, BF_EMULATE_TEXT, emul ? BF_EMULATE_TEXT : 0);
if (!(flags & MF_NOCLEARMEM)) {
if (GET_GLOBAL(CBmodeinfo.memmodel) == MM_TEXT) {
memset16_far(SEG_CTEXT, (void*)0, 0x0720, 80*25*2);
return 0;
}
if (extra_stack || flags & MF_LEGACY) {
struct gfx_op op;
init_gfx_op(&op, &CBmodeinfo);
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;
};
void
cbvga_setup_modes(u64 addr, u8 bpp, u32 xlines, u32 ylines, u32 linelength)
{
int i;
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);
memcpy_far(get_global_seg(), &CBemulinfo
, get_global_seg(), &CBmodeinfo, sizeof(CBemulinfo));
// Validate modes
for (i = 0; i < GET_GLOBAL(svga_mcount); i++) {
struct generic_svga_mode *cbmode_g = &svga_modes[i];
/* Skip VBE modes that doesn't fit into coreboot's framebuffer */
if ((GET_GLOBAL(cbmode_g->info.memmodel) != MM_DIRECT)
|| (GET_GLOBAL(cbmode_g->info.height) > ylines)
|| (GET_GLOBAL(cbmode_g->info.width) > xlines)
|| (GET_GLOBAL(cbmode_g->info.depth) != bpp)) {
dprintf(3, "Removing mode %x\n", GET_GLOBAL(cbmode_g->mode));
SET_VGA(cbmode_g->mode, 0xffff);
}
if ((GET_GLOBAL(cbmode_g->info.height) == ylines)
&& (GET_GLOBAL(cbmode_g->info.width) == xlines)
&& (GET_GLOBAL(cbmode_g->info.depth) == bpp)) {
SET_VGA(CBmode, GET_GLOBAL(cbmode_g->mode));
}
}
}
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->blue_mask_size)
+ GET_FARVAR(0, cbfb->green_mask_size)
+ GET_FARVAR(0, cbfb->red_mask_size)
+ GET_FARVAR(0, cbfb->reserved_mask_size);
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);
//fall back to coreboot reported bpp if calculated value invalid
if (bpp != 15 && bpp != 16 && bpp != 24 && bpp != 32)
bpp = GET_FARVAR(0, cbfb->bits_per_pixel);
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;
}
cbvga_setup_modes(addr, bpp, xlines, ylines, linelength);
return 0;
}
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