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toaruos/modules/lfbvideo.c

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/* vim: tabstop=4 shiftwidth=4 noexpandtab
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2014-2018 K. Lange
*
* Generic linear framebuffer driver.
*
* Supports several cases:
* - Bochs/QEMU/VirtualBox "Bochs VBE" with modesetting.
* - VMware SVGA with modesetting.
* - Linear framebuffers set by the bootloader with no modesetting.
*/
#include <kernel/system.h>
#include <kernel/fs.h>
#include <kernel/printf.h>
#include <kernel/types.h>
#include <kernel/logging.h>
#include <kernel/pci.h>
#include <kernel/boot.h>
#include <kernel/args.h>
#include <kernel/tokenize.h>
#include <kernel/module.h>
#include <kernel/video.h>
#include <kernel/mod/procfs.h>
#define PREFERRED_W 1024
#define PREFERRED_H 768
#define PREFERRED_VY 4096
#define PREFERRED_B 32
/* Exported to other modules */
uint16_t lfb_resolution_x = 0;
uint16_t lfb_resolution_y = 0;
uint16_t lfb_resolution_b = 0;
uint32_t lfb_resolution_s = 0;
uint8_t * lfb_vid_memory = (uint8_t *)0xE0000000;
const char * lfb_driver_name = NULL;
/* Where to send display size change signals */
static pid_t display_change_recipient = 0;
/* Driver-specific modesetting function */
static void (*lfb_resolution_impl)(uint16_t,uint16_t) = NULL;
/* Called by ioctl on /dev/fb0 */
void lfb_set_resolution(uint16_t x, uint16_t y) {
if (lfb_resolution_impl) {
lfb_resolution_impl(x,y);
if (display_change_recipient) {
send_signal(display_change_recipient, SIGWINEVENT, 1);
debug_print(WARNING, "Telling %d to SIGWINEVENT", display_change_recipient);
}
}
}
/**
* Framebuffer control ioctls.
* Used by the compositor to get display sizes and by the
* resolution changer to initiate modesetting.
*/
static int ioctl_vid(fs_node_t * node, int request, void * argp) {
switch (request) {
case IO_VID_WIDTH:
/* Get framebuffer width */
validate(argp);
*((size_t *)argp) = lfb_resolution_x;
return 0;
case IO_VID_HEIGHT:
/* Get framebuffer height */
validate(argp);
*((size_t *)argp) = lfb_resolution_y;
return 0;
case IO_VID_DEPTH:
/* Get framebuffer bit depth */
validate(argp);
*((size_t *)argp) = lfb_resolution_b;
return 0;
case IO_VID_STRIDE:
/* Get framebuffer scanline stride */
validate(argp);
*((size_t *)argp) = lfb_resolution_s;
return 0;
case IO_VID_ADDR:
/* Get framebuffer address - TODO: map the framebuffer? */
validate(argp);
*((uintptr_t *)argp) = (uintptr_t)lfb_vid_memory;
return 0;
case IO_VID_SIGNAL:
/* ioctl to register for a signal (vid device change? idk) on display change */
display_change_recipient = getpid();
return 0;
case IO_VID_SET:
/* Initiate mode setting */
validate(argp);
lfb_set_resolution(((struct vid_size *)argp)->width, ((struct vid_size *)argp)->height);
return 0;
case IO_VID_DRIVER:
validate(argp);
memcpy(argp, lfb_driver_name, strlen(lfb_driver_name));
return 0;
default:
return -EINVAL;
}
}
/* Framebuffer device file initializer */
static fs_node_t * lfb_video_device_create(void /* TODO */) {
fs_node_t * fnode = malloc(sizeof(fs_node_t));
memset(fnode, 0x00, sizeof(fs_node_t));
sprintf(fnode->name, "fb0"); /* TODO */
fnode->length = lfb_resolution_s * lfb_resolution_y; /* Size is framebuffer size in bytes */
fnode->flags = FS_BLOCKDEVICE; /* Framebuffers are block devices */
fnode->mask = 0660; /* Only accessible to root user/group */
fnode->ioctl = ioctl_vid; /* control function defined above */
return fnode;
}
/**
* Framebuffer fatal error presentation.
*
* This is called by a kernel hook to render fatal error messages
* (panic / oops / bsod) to the graphraical framebuffer. Mostly,
* that means the "out of memory" error. Bescause this is a fatal
* error condition, we don't care much about speed, so we can do
* silly things like ready from the framebuffer, which we do to
* produce a vignetting and desaturation effect.
*/
static int vignette_at(int x, int y) {
int amount = 0;
int level = 100;
if (x < level) amount += (level - x);
if (x > lfb_resolution_x - level) amount += (level - (lfb_resolution_x - x));
if (y < level) amount += (level - y);
if (y > lfb_resolution_y - level) amount += (level - (lfb_resolution_y - y));
return amount;
}
#include "../apps/terminal-font.h"
/* XXX Why is this not defined in the font header... */
#define char_height 20
#define char_width 9
/* Set point in framebuffer */
static void set_point(int x, int y, uint32_t value) {
uint32_t * disp = (uint32_t *)lfb_vid_memory;
uint32_t * cell = &disp[y * (lfb_resolution_s / 4) + x];
*cell = value;
}
/* Draw text on framebuffer */
static void write_char(int x, int y, int val, uint32_t color) {
if (val > 128) {
val = 4;
}
uint16_t * c = large_font[val];
for (uint8_t i = 0; i < char_height; ++i) {
for (uint8_t j = 0; j < char_width; ++j) {
if (c[i] & (1 << (15-j))) {
set_point(x+j,y+i,color);
}
}
}
}
#define _RED(color) ((color & 0x00FF0000) / 0x10000)
#define _GRE(color) ((color & 0x0000FF00) / 0x100)
#define _BLU(color) ((color & 0x000000FF) / 0x1)
#define _ALP(color) ((color & 0xFF000000) / 0x1000000)
static void lfb_video_panic(char ** msgs) {
/* Desaturate the display */
uint32_t * disp = (uint32_t *)lfb_vid_memory;
for (int y = 0; y < lfb_resolution_y; y++) {
for (int x = 0; x < lfb_resolution_x; x++) {
uint32_t * cell = &disp[y * (lfb_resolution_s / 4) + x];
int r = _RED(*cell);
int g = _GRE(*cell);
int b = _BLU(*cell);
int l = 3 * r + 6 * g + 1 * b;
r = (l) / 10;
g = (l) / 10;
b = (l) / 10;
r = r > 255 ? 255 : r;
g = g > 255 ? 255 : g;
b = b > 255 ? 255 : b;
int amount = vignette_at(x,y);
r = (r - amount < 0) ? 0 : r - amount;
g = (g - amount < 0) ? 0 : g - amount;
b = (b - amount < 0) ? 0 : b - amount;
*cell = 0xFF000000 + ((0xFF & r) * 0x10000) + ((0xFF & g) * 0x100) + ((0xFF & b) * 0x1);
}
}
/* Now print the message, divided on line feeds, into the center of the screen */
int num_entries = 0;
for (char ** m = msgs; *m; m++, num_entries++);
int y = (lfb_resolution_y - (num_entries * char_height)) / 2;
for (char ** message = msgs; *message; message++) {
int x = (lfb_resolution_x - (strlen(*message) * char_width)) / 2;
for (char * c = *message; *c; c++) {
write_char(x+1, y+1, *c, 0xFF000000);
write_char(x, y, *c, 0xFFFF0000);
x += char_width;
}
y += char_height;
}
}
static uint32_t framebuffer_func(fs_node_t * node, uint32_t offset, uint32_t size, uint8_t * buffer) {
char * buf = malloc(4096);
if (lfb_driver_name) {
sprintf(buf,
"Driver:\t%s\n"
"XRes:\t%d\n"
"YRes:\t%d\n"
"BitsPerPixel:\t%d\n"
"Stride:\t%d\n"
"Address:\t0x%x\n",
lfb_driver_name,
lfb_resolution_x,
lfb_resolution_y,
lfb_resolution_b,
lfb_resolution_s,
lfb_vid_memory);
} else {
sprintf(buf, "Driver:\tnone\n");
}
size_t _bsize = strlen(buf);
if (offset > _bsize) {
free(buf);
return 0;
}
if (size > _bsize - offset) size = _bsize - offset;
memcpy(buffer, buf + offset, size);
free(buf);
return size;
}
static struct procfs_entry framebuffer_entry = {
0,
"framebuffer",
framebuffer_func,
};
/* Install framebuffer device */
static void finalize_graphics(const char * driver) {
lfb_driver_name = driver;
fs_node_t * fb_device = lfb_video_device_create();
vfs_mount("/dev/fb0", fb_device);
debug_video_crash = lfb_video_panic;
int (*procfs_install)(struct procfs_entry *) = (int (*)(struct procfs_entry *))(uintptr_t)hashmap_get(modules_get_symbols(),"procfs_install");
if (procfs_install) {
procfs_install(&framebuffer_entry);
}
}
/* Bochs support {{{ */
static void bochs_scan_pci(uint32_t device, uint16_t v, uint16_t d, void * extra) {
if ((v == 0x1234 && d == 0x1111) ||
(v == 0x80EE && d == 0xBEEF) ||
(v == 0x10de && d == 0x0a20)) {
uintptr_t t = pci_read_field(device, PCI_BAR0, 4);
if (t > 0) {
*((uint8_t **)extra) = (uint8_t *)(t & 0xFFFFFFF0);
}
}
}
static void bochs_set_resolution(uint16_t x, uint16_t y) {
outports(0x1CE, 0x04);
outports(0x1CF, 0x00);
/* Uh oh, here we go. */
outports(0x1CE, 0x01);
outports(0x1CF, x);
/* Set Y resolution to 768 */
outports(0x1CE, 0x02);
outports(0x1CF, y);
/* Set bpp to 32 */
outports(0x1CE, 0x03);
outports(0x1CF, PREFERRED_B);
/* Set Virtual Height to stuff */
outports(0x1CE, 0x07);
outports(0x1CF, PREFERRED_VY);
/* Turn it back on */
outports(0x1CE, 0x04);
outports(0x1CF, 0x41);
/* Read X to see if it's something else */
outports(0x1CE, 0x01);
uint16_t new_x = inports(0x1CF);
if (x != new_x) {
x = new_x;
}
lfb_resolution_x = x;
lfb_resolution_s = x * 4;
lfb_resolution_y = y;
lfb_resolution_b = 32;
}
static void graphics_install_bochs(uint16_t resolution_x, uint16_t resolution_y) {
uint32_t vid_memsize;
debug_print(NOTICE, "Setting up BOCHS/QEMU graphics controller...");
outports(0x1CE, 0x00);
uint16_t i = inports(0x1CF);
if (i < 0xB0C0 || i > 0xB0C6) {
return;
}
outports(0x1CF, 0xB0C4);
i = inports(0x1CF);
bochs_set_resolution(resolution_x, resolution_y);
resolution_x = lfb_resolution_x; /* may have changed */
pci_scan(bochs_scan_pci, -1, &lfb_vid_memory);
lfb_resolution_impl = &bochs_set_resolution;
if (!lfb_vid_memory) {
debug_print(ERROR, "Failed to locate video memory.");
return;
}
/* Enable the higher memory */
uintptr_t fb_offset = (uintptr_t)lfb_vid_memory;
for (uintptr_t i = fb_offset; i <= fb_offset + 0xFF0000; i += 0x1000) {
page_t * p = get_page(i, 1, kernel_directory);
dma_frame(p, 0, 1, i);
p->pat = 1;
p->writethrough = 1;
p->cachedisable = 1;
}
outports(0x1CE, 0x0a);
i = inports(0x1CF);
if (i > 1) {
vid_memsize = (uint32_t)i * 64 * 1024;
} else {
vid_memsize = inportl(0x1CF);
}
debug_print(WARNING, "Video memory size is 0x%x", vid_memsize);
for (uintptr_t i = (uintptr_t)lfb_vid_memory; i <= (uintptr_t)lfb_vid_memory + vid_memsize; i += 0x1000) {
dma_frame(get_page(i, 1, kernel_directory), 0, 1, i);
}
finalize_graphics("bochs");
}
static void graphics_install_preset(uint16_t w, uint16_t h) {
if (!(mboot_ptr && (mboot_ptr->flags & (1 << 12)))) {
debug_print(ERROR, "Failed to locate preset video memory - missing multiboot header.");
return;
}
/* Extract framebuffer information from multiboot */
lfb_vid_memory = (void *)mboot_ptr->framebuffer_addr;
lfb_resolution_x = mboot_ptr->framebuffer_width;
lfb_resolution_y = mboot_ptr->framebuffer_height;
lfb_resolution_s = mboot_ptr->framebuffer_pitch;
lfb_resolution_b = 32;
debug_print(WARNING, "Mode was set by bootloader: %dx%d bpp should be 32, framebuffer is at 0x%x", w, h, (uintptr_t)lfb_vid_memory);
for (uintptr_t i = (uintptr_t)lfb_vid_memory; i <= (uintptr_t)lfb_vid_memory + w * h * 4; i += 0x1000) {
page_t * p = get_page(i, 1, kernel_directory);
dma_frame(p, 0, 1, i);
p->pat = 1;
p->writethrough = 1;
p->cachedisable = 1;
}
finalize_graphics("preset");
}
static void graphics_install_kludge(uint16_t w, uint16_t h) {
uint32_t * herp = (uint32_t *)0xA0000;
herp[0] = 0xA5ADFACE;
herp[1] = 0xFAF42943;
for (int i = 2; i < 1000; i += 2) {
herp[i] = 0xFF00FF00;
herp[i+1] = 0x00FF00FF;
}
for (uintptr_t fb_offset = 0xE0000000; fb_offset < 0xFF000000; fb_offset += 0x01000000) {
/* Enable the higher memory */
for (uintptr_t i = fb_offset; i <= fb_offset + 0xFF0000; i += 0x1000) {
dma_frame(get_page(i, 1, kernel_directory), 0, 1, i);
}
/* Go find it */
for (uintptr_t x = fb_offset; x < fb_offset + 0xFF0000; x += 0x1000) {
if (((uintptr_t *)x)[0] == 0xA5ADFACE && ((uintptr_t *)x)[1] == 0xFAF42943) {
lfb_vid_memory = (uint8_t *)x;
debug_print(INFO, "Had to futz around, but found video memory at 0x%x", lfb_vid_memory);
goto mem_found;
}
}
}
mem_found:
lfb_resolution_x = w;
lfb_resolution_y = h;
lfb_resolution_s = w * 4;
lfb_resolution_b = 32;
for (uintptr_t i = (uintptr_t)lfb_vid_memory; i <= (uintptr_t)lfb_vid_memory + w * h * 4; i += 0x1000) {
page_t * p = get_page(i, 1, kernel_directory);
dma_frame(p, 0, 1, i);
p->pat = 1;
p->writethrough = 1;
p->cachedisable = 1;
}
finalize_graphics("kludge");
}
#define SVGA_IO_BASE (vmware_io)
#define SVGA_IO_MUL 1
#define SVGA_INDEX_PORT 0
#define SVGA_VALUE_PORT 1
#define SVGA_REG_ID 0
#define SVGA_REG_ENABLE 1
#define SVGA_REG_WIDTH 2
#define SVGA_REG_HEIGHT 3
#define SVGA_REG_BITS_PER_PIXEL 7
#define SVGA_REG_BYTES_PER_LINE 12
#define SVGA_REG_FB_START 13
static uint32_t vmware_io = 0;
static void vmware_scan_pci(uint32_t device, uint16_t v, uint16_t d, void * extra) {
if ((v == 0x15ad && d == 0x0405)) {
uintptr_t t = pci_read_field(device, PCI_BAR0, 4);
if (t > 0) {
*((uint8_t **)extra) = (uint8_t *)(t & 0xFFFFFFF0);
}
}
}
static void vmware_write(int reg, int value) {
outportl(SVGA_IO_MUL * SVGA_INDEX_PORT + SVGA_IO_BASE, reg);
outportl(SVGA_IO_MUL * SVGA_VALUE_PORT + SVGA_IO_BASE, value);
}
static uint32_t vmware_read(int reg) {
outportl(SVGA_IO_MUL * SVGA_INDEX_PORT + SVGA_IO_BASE, reg);
return inportl(SVGA_IO_MUL * SVGA_VALUE_PORT + SVGA_IO_BASE);
}
static void vmware_set_resolution(uint16_t w, uint16_t h) {
vmware_write(SVGA_REG_ENABLE, 0);
vmware_write(SVGA_REG_ID, 0);
vmware_write(SVGA_REG_WIDTH, w);
vmware_write(SVGA_REG_HEIGHT, h);
vmware_write(SVGA_REG_BITS_PER_PIXEL, 32);
vmware_write(SVGA_REG_ENABLE, 1);
uint32_t bpl = vmware_read(SVGA_REG_BYTES_PER_LINE);
lfb_resolution_x = w;
lfb_resolution_s = bpl;
lfb_resolution_y = h;
lfb_resolution_b = 32;
}
static void graphics_install_vmware(uint16_t w, uint16_t h) {
pci_scan(vmware_scan_pci, -1, &vmware_io);
if (!vmware_io) {
debug_print(ERROR, "No vmware device found?");
return;
} else {
debug_print(WARNING, "vmware io base: 0x%x", vmware_io);
}
vmware_set_resolution(w,h);
lfb_resolution_impl = &vmware_set_resolution;
uint32_t fb_addr = vmware_read(SVGA_REG_FB_START);
debug_print(WARNING, "vmware fb address: 0x%x", fb_addr);
uint32_t fb_size = vmware_read(15);
debug_print(WARNING, "vmware fb size: 0x%x", fb_size);
lfb_vid_memory = (uint8_t *)fb_addr;
uintptr_t fb_offset = (uintptr_t)lfb_vid_memory;
for (uintptr_t i = fb_offset; i <= fb_offset + fb_size; i += 0x1000) {
page_t * p = get_page(i, 1, kernel_directory);
dma_frame(p, 0, 1, i);
p->pat = 1;
p->writethrough = 1;
p->cachedisable = 1;
}
finalize_graphics("vmware");
}
struct disp_mode {
int16_t x;
int16_t y;
int set;
};
static void auto_scan_pci(uint32_t device, uint16_t v, uint16_t d, void * extra) {
struct disp_mode * mode = extra;
if (mode->set) return;
if ((v == 0x1234 && d == 0x1111) ||
(v == 0x80EE && d == 0xBEEF) ||
(v == 0x10de && d == 0x0a20)) {
mode->set = 1;
graphics_install_bochs(mode->x, mode->y);
} else if ((v == 0x15ad && d == 0x0405)) {
mode->set = 1;
graphics_install_vmware(mode->x, mode->y);
}
}
static int init(void) {
if (mboot_ptr->vbe_mode_info) {
lfb_vid_memory = (uint8_t *)((vbe_info_t *)(mboot_ptr->vbe_mode_info))->physbase;
}
char * c;
if ((c = args_value("vid"))) {
debug_print(NOTICE, "Video mode requested: %s", c);
char * arg = strdup(c);
char * argv[10];
int argc = tokenize(arg, ",", argv);
uint16_t x, y;
if (argc < 3) {
x = PREFERRED_W;
y = PREFERRED_H;
} else {
x = atoi(argv[1]);
y = atoi(argv[2]);
}
if (!strcmp(argv[0], "auto")) {
/* Attempt autodetection */
debug_print(NOTICE, "Automatically detecting display driver...");
struct disp_mode mode = {x,y,0};
pci_scan(auto_scan_pci, -1, &mode);
if (!mode.set) {
graphics_install_preset(x,y);
}
} else if (!strcmp(argv[0], "qemu")) {
/* Bochs / Qemu Video Device */
graphics_install_bochs(x,y);
} else if (!strcmp(argv[0],"vmware")) {
/* VMware SVGA */
graphics_install_vmware(x,y);
} else if (!strcmp(argv[0],"preset")) {
/* Set by bootloader (UEFI) */
graphics_install_preset(x,y);
} else if (!strcmp(argv[0],"kludge")) {
/* Old hack to find vid memory from the VGA window */
graphics_install_kludge(x,y);
} else {
debug_print(WARNING, "Unrecognized video adapter: %s", argv[0]);
}
free(arg);
}
return 0;
}
static int fini(void) {
return 0;
}
MODULE_DEF(lfbvideo, init, fini);
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