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grub/grub-core/video/bochs.c
Ave Milia a0ba8fae61 video/bochs: Fix typo 
Signed-off-by: Ave Milia <avemilia@protonmail.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
2020-09-11 15:45:56 +02:00

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2005,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#define grub_video_render_target grub_video_fbrender_target
#include <grub/err.h>
#include <grub/types.h>
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/mm.h>
#include <grub/video.h>
#include <grub/video_fb.h>
#include <grub/pci.h>
#include <grub/vga.h>
GRUB_MOD_LICENSE ("GPLv3+");
static struct
{
struct grub_video_mode_info mode_info;
grub_uint8_t *ptr;
int mapped;
grub_uint32_t base;
grub_pci_device_t dev;
} framebuffer;
#define BOCHS_APERTURE_SIZE 0x800000
#define BOCHS_MAX_WIDTH 1600
#define BOCHS_MAX_HEIGHT 1200
#define BOCHS_WIDTH_ALIGN 8
enum
{
BOCHS_VBE_INDEX = 0x1ce,
BOCHS_VBE_DATA = 0x1cf,
};
enum
{
BOCHS_VBE_WIDTH = 1,
BOCHS_VBE_HEIGHT = 2,
BOCHS_VBE_BPP = 3,
BOCHS_VBE_ENABLE = 4,
BOCHS_VBE_Y_OFFSET = 9,
BOCHS_VBE_MAX
};
static void
vbe_write (grub_uint16_t val, grub_uint16_t addr)
{
grub_outw (addr, BOCHS_VBE_INDEX);
grub_outw (val, BOCHS_VBE_DATA);
}
static grub_uint16_t
vbe_read (grub_uint16_t addr)
{
grub_outw (addr, BOCHS_VBE_INDEX);
return grub_inw (BOCHS_VBE_DATA);
}
struct saved_state
{
grub_uint8_t cr[256];
grub_uint8_t gr[256];
grub_uint8_t sr[256];
grub_uint8_t r[256];
grub_uint8_t g[256];
grub_uint8_t b[256];
grub_uint8_t vbe[BOCHS_VBE_MAX];
int vbe_enable;
/* We need to preserve VGA font and VGA text. */
grub_uint8_t vram[32 * 4 * 256];
};
static struct saved_state initial_state;
static int state_saved = 0;
static void
save_state (struct saved_state *st)
{
unsigned i;
for (i = 0; i < ARRAY_SIZE (st->cr); i++)
st->cr[i] = grub_vga_cr_read (i);
for (i = 0; i < ARRAY_SIZE (st->gr); i++)
st->gr[i] = grub_vga_gr_read (i);
for (i = 0; i < ARRAY_SIZE (st->sr); i++)
st->sr[i] = grub_vga_sr_read (i);
for (i = 0; i < 256; i++)
grub_vga_palette_read (i, st->r + i, st->g + i, st->b + i);
st->vbe_enable = vbe_read (BOCHS_VBE_ENABLE) & 1;
if (st->vbe_enable)
for (i = 0; i < ARRAY_SIZE (st->vbe); i++)
st->vbe[i] = vbe_read (i);
grub_vga_sr_write (GRUB_VGA_SR_MEMORY_MODE_CHAIN4, GRUB_VGA_SR_MEMORY_MODE);
grub_memcpy (st->vram, framebuffer.ptr, sizeof (st->vram));
grub_vga_sr_write (st->sr[GRUB_VGA_SR_MEMORY_MODE], GRUB_VGA_SR_MEMORY_MODE);
}
static void
restore_state (struct saved_state *st)
{
unsigned i;
if (st->vbe_enable)
for (i = 0; i < ARRAY_SIZE (st->vbe); i++)
vbe_write (st->vbe[i], i);
else
vbe_write (0, BOCHS_VBE_ENABLE);
grub_vga_cr_write (0, 0x11);
for (i = 0; i < ARRAY_SIZE (st->cr); i++)
grub_vga_cr_write (st->cr[i], i);
for (i = 0; i < ARRAY_SIZE (st->sr); i++)
grub_vga_sr_write (st->sr[i], i);
for (i = 0; i < ARRAY_SIZE (st->gr); i++)
grub_vga_gr_write (st->gr[i], i);
for (i = 0; i < 256; i++)
grub_vga_palette_write (i, st->r[i], st->g[i], st->b[i]);
grub_vga_sr_write (GRUB_VGA_SR_MEMORY_MODE_CHAIN4, GRUB_VGA_SR_MEMORY_MODE);
grub_memcpy (framebuffer.ptr, st->vram, sizeof (st->vram));
grub_vga_sr_write (st->sr[GRUB_VGA_SR_MEMORY_MODE], GRUB_VGA_SR_MEMORY_MODE);
}
static grub_err_t
grub_video_bochs_video_init (void)
{
/* Reset frame buffer. */
grub_memset (&framebuffer, 0, sizeof(framebuffer));
return grub_video_fb_init ();
}
static grub_err_t
grub_video_bochs_video_fini (void)
{
if (framebuffer.mapped)
grub_pci_device_unmap_range (framebuffer.dev, framebuffer.ptr,
BOCHS_APERTURE_SIZE);
if (state_saved)
{
restore_state (&initial_state);
state_saved = 0;
}
return grub_video_fb_fini ();
}
static grub_err_t
doublebuf_pageflipping_set_page (int page)
{
int start = framebuffer.mode_info.height * page;
vbe_write (start, BOCHS_VBE_Y_OFFSET);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_video_bochs_set_palette (unsigned int start, unsigned int count,
struct grub_video_palette_data *palette_data)
{
if (framebuffer.mode_info.mode_type == GRUB_VIDEO_MODE_TYPE_INDEX_COLOR)
{
unsigned i;
if (start >= 0x100)
return GRUB_ERR_NONE;
if (start + count >= 0x100)
count = 0x100 - start;
for (i = 0; i < count; i++)
grub_vga_palette_write (start + i, palette_data[i].r, palette_data[i].g,
palette_data[i].b);
}
/* Then set color to emulated palette. */
return grub_video_fb_set_palette (start, count, palette_data);
}
/* Helper for grub_video_bochs_setup. */
static int
find_card (grub_pci_device_t dev, grub_pci_id_t pciid, void *data)
{
int *found = data;
grub_pci_address_t addr;
grub_uint32_t class;
addr = grub_pci_make_address (dev, GRUB_PCI_REG_CLASS);
class = grub_pci_read (addr);
if (((class >> 16) & 0xffff) != 0x0300 || pciid != 0x11111234)
return 0;
addr = grub_pci_make_address (dev, GRUB_PCI_REG_ADDRESS_REG0);
framebuffer.base = grub_pci_read (addr) & GRUB_PCI_ADDR_MEM_MASK;
if (!framebuffer.base)
return 0;
*found = 1;
framebuffer.dev = dev;
/* Enable address spaces. */
addr = grub_pci_make_address (framebuffer.dev, GRUB_PCI_REG_COMMAND);
grub_pci_write (addr, 0x7);
return 1;
}
static grub_err_t
grub_video_bochs_setup (unsigned int width, unsigned int height,
grub_video_mode_type_t mode_type,
grub_video_mode_type_t mode_mask)
{
int depth;
grub_err_t err;
int found = 0;
int pitch, bytes_per_pixel;
grub_size_t page_size; /* The size of a page in bytes. */
/* Decode depth from mode_type. If it is zero, then autodetect. */
depth = (mode_type & GRUB_VIDEO_MODE_TYPE_DEPTH_MASK)
>> GRUB_VIDEO_MODE_TYPE_DEPTH_POS;
if (width == 0 || height == 0)
{
width = 800;
height = 600;
}
if (width > BOCHS_MAX_WIDTH)
return grub_error (GRUB_ERR_IO, "width must be at most",
BOCHS_MAX_WIDTH);
if (height > BOCHS_MAX_HEIGHT)
return grub_error (GRUB_ERR_IO, "height must be at most",
BOCHS_MAX_HEIGHT);
if (width & (BOCHS_WIDTH_ALIGN - 1))
return grub_error (GRUB_ERR_IO, "width must be a multiple of %d",
BOCHS_WIDTH_ALIGN);
if (depth == 0
&& !grub_video_check_mode_flag (mode_type, mode_mask,
GRUB_VIDEO_MODE_TYPE_INDEX_COLOR, 0))
depth = 24;
if (depth == 0)
depth = 8;
if (depth != 32 && depth != 24 && depth != 16 && depth != 15 && depth != 8
&& depth != 4)
return grub_error (GRUB_ERR_IO, "only 32, 24, 16, 15 and 8-bpp are"
" supported by bochs video");
if (depth == 4)
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET, "4-bpp isn't supported");
bytes_per_pixel = (depth + 7) / 8;
if (depth == 4)
pitch = width / 2;
else
pitch = width * bytes_per_pixel;
page_size = pitch * height;
if (page_size > BOCHS_APERTURE_SIZE)
return grub_error (GRUB_ERR_IO, "Not enough video memory for this mode");
grub_pci_iterate (find_card, &found);
if (!found)
return grub_error (GRUB_ERR_IO, "Couldn't find graphics card");
if (found && framebuffer.base == 0)
{
/* FIXME: change framebuffer base */
return grub_error (GRUB_ERR_IO, "PCI BAR not set");
}
/* We can safely discard volatile attribute. */
framebuffer.ptr = (void *) grub_pci_device_map_range (framebuffer.dev,
framebuffer.base,
BOCHS_APERTURE_SIZE);
framebuffer.mapped = 1;
if (!state_saved)
{
save_state (&initial_state);
state_saved = 1;
}
{
vbe_write (0, BOCHS_VBE_ENABLE);
vbe_write (width, BOCHS_VBE_WIDTH);
vbe_write (height, BOCHS_VBE_HEIGHT);
vbe_write (depth, BOCHS_VBE_BPP);
vbe_write (1, BOCHS_VBE_ENABLE);
doublebuf_pageflipping_set_page (0);
}
/* Fill mode info details. */
framebuffer.mode_info.width = width;
framebuffer.mode_info.height = height;
framebuffer.mode_info.mode_type = GRUB_VIDEO_MODE_TYPE_RGB;
framebuffer.mode_info.bpp = depth;
framebuffer.mode_info.bytes_per_pixel = bytes_per_pixel;
framebuffer.mode_info.pitch = pitch;
framebuffer.mode_info.number_of_colors = 256;
framebuffer.mode_info.reserved_mask_size = 0;
framebuffer.mode_info.reserved_field_pos = 0;
switch (depth)
{
case 4:
case 8:
framebuffer.mode_info.mode_type = GRUB_VIDEO_MODE_TYPE_INDEX_COLOR;
framebuffer.mode_info.number_of_colors = 16;
break;
case 16:
framebuffer.mode_info.red_mask_size = 5;
framebuffer.mode_info.red_field_pos = 11;
framebuffer.mode_info.green_mask_size = 6;
framebuffer.mode_info.green_field_pos = 5;
framebuffer.mode_info.blue_mask_size = 5;
framebuffer.mode_info.blue_field_pos = 0;
break;
case 15:
framebuffer.mode_info.red_mask_size = 5;
framebuffer.mode_info.red_field_pos = 10;
framebuffer.mode_info.green_mask_size = 5;
framebuffer.mode_info.green_field_pos = 5;
framebuffer.mode_info.blue_mask_size = 5;
framebuffer.mode_info.blue_field_pos = 0;
break;
case 32:
framebuffer.mode_info.reserved_mask_size = 8;
framebuffer.mode_info.reserved_field_pos = 24;
/* Fallthrough. */
case 24:
framebuffer.mode_info.red_mask_size = 8;
framebuffer.mode_info.red_field_pos = 16;
framebuffer.mode_info.green_mask_size = 8;
framebuffer.mode_info.green_field_pos = 8;
framebuffer.mode_info.blue_mask_size = 8;
framebuffer.mode_info.blue_field_pos = 0;
break;
}
framebuffer.mode_info.blit_format = grub_video_get_blit_format (&framebuffer.mode_info);
if (BOCHS_APERTURE_SIZE >= 2 * page_size)
err = grub_video_fb_setup (mode_type, mode_mask,
&framebuffer.mode_info,
framebuffer.ptr,
doublebuf_pageflipping_set_page,
framebuffer.ptr + page_size);
else
err = grub_video_fb_setup (mode_type, mode_mask,
&framebuffer.mode_info,
framebuffer.ptr, 0, 0);
/* Copy default palette to initialize emulated palette. */
err = grub_video_bochs_set_palette (0, GRUB_VIDEO_FBSTD_NUMCOLORS,
grub_video_fbstd_colors);
return err;
}
static struct grub_video_adapter grub_video_bochs_adapter =
{
.name = "Bochs PCI Video Driver",
.id = GRUB_VIDEO_DRIVER_BOCHS,
.prio = GRUB_VIDEO_ADAPTER_PRIO_NATIVE,
.init = grub_video_bochs_video_init,
.fini = grub_video_bochs_video_fini,
.setup = grub_video_bochs_setup,
.get_info = grub_video_fb_get_info,
.get_info_and_fini = grub_video_fb_get_info_and_fini,
.set_palette = grub_video_bochs_set_palette,
.get_palette = grub_video_fb_get_palette,
.set_viewport = grub_video_fb_set_viewport,
.get_viewport = grub_video_fb_get_viewport,
.set_region = grub_video_fb_set_region,
.get_region = grub_video_fb_get_region,
.set_area_status = grub_video_fb_set_area_status,
.get_area_status = grub_video_fb_get_area_status,
.map_color = grub_video_fb_map_color,
.map_rgb = grub_video_fb_map_rgb,
.map_rgba = grub_video_fb_map_rgba,
.unmap_color = grub_video_fb_unmap_color,
.fill_rect = grub_video_fb_fill_rect,
.blit_bitmap = grub_video_fb_blit_bitmap,
.blit_render_target = grub_video_fb_blit_render_target,
.scroll = grub_video_fb_scroll,
.swap_buffers = grub_video_fb_swap_buffers,
.create_render_target = grub_video_fb_create_render_target,
.delete_render_target = grub_video_fb_delete_render_target,
.set_active_render_target = grub_video_fb_set_active_render_target,
.get_active_render_target = grub_video_fb_get_active_render_target,
.next = 0
};
GRUB_MOD_INIT(video_bochs)
{
grub_video_register (&grub_video_bochs_adapter);
}
GRUB_MOD_FINI(video_bochs)
{
grub_video_unregister (&grub_video_bochs_adapter);
}
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