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framebuffer.cc
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framebuffer.cc
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/* Copyright (C) 2015 Goswin von Brederlow <goswin-v-b@web.de>
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Framebuffer support for the Raspberry Pi
*/
#include <stdint.h>
#include "framebuffer.h"
#include "peripherals.h"
#include "barriers.h"
#include "stdio.h"
#include "font.h"
namespace Framebuffer {
enum {
// Mailbox registers
MAILBOX0READ = 0xb880,
MAILBOX0STATUS = 0xb898,
MAILBOX0WRITE = 0xb8a0,
// Channel for framebuffer
FBCHAN = 8,
};
#define MAILBOX(x) (Peripherals::reg(x))
FB fb;
// Status register
enum { SHIFT_EMPTY = 30, SHIFT_FULL };
enum Flags {
EMPTY = 1 << SHIFT_EMPTY,
FULL = 1 << SHIFT_FULL
};
void write(void *buf, uint32_t chan) {
volatile uint32_t *status = MAILBOX(MAILBOX0STATUS);
volatile uint32_t *write = MAILBOX(MAILBOX0WRITE);
data_memory_barrier();
// don't use cached values
flush_cache();
puts("status at ");
put_uint32((intptr_t)status);
putc('\n');
// wait for mailbox to be not full
while(*status & FULL) {
puts("full\n");
flush_cache();
}
*write = (intptr_t)buf | chan;
}
void * read(uint32_t chan) {
volatile uint32_t *status = MAILBOX(MAILBOX0STATUS);
volatile uint32_t *read = MAILBOX(MAILBOX0READ);
// possibly switching peripheral
data_memory_barrier();
while(true) {
// don't use cached values
flush_cache();
// wait for mailbox to contain something
while(*status & EMPTY) {
flush_cache();
}
uint32_t res = *read;
if ((res & 0xF) == chan) return (void *)(res & ~0xF);
}
}
// initialize framebuffer
Error init(void) {
puts("Framebuffer::init()\n");
// some spare memory for mail content
uint32_t mailbuffer[1024] __attribute__((aligned(16)));
/* Get the display size */
mailbuffer[0] = 8 * 4; // Total size
mailbuffer[1] = 0; // Request
mailbuffer[2] = 0x40003; // Display size
mailbuffer[3] = 8; // Buffer size
mailbuffer[4] = 0; // Request size
mailbuffer[5] = 0; // Space for horizontal resolution
mailbuffer[6] = 0; // Space for vertical resolution
mailbuffer[7] = 0; // End tag
write(mailbuffer, FBCHAN);
uint32_t *buf = (uint32_t *)read(FBCHAN);
/* Valid response in data structure? */
if (buf[1] != 0x80000000) return FAIL_GET_RESOLUTION;
fb.width = buf[5];
fb.height = buf[6];
if (fb.width == 0 || fb.height == 0) return FAIL_GOT_INVALID_RESOLUTION;
/* Set up screen */
unsigned int c = 1;
mailbuffer[c++] = 0; // Request
mailbuffer[c++] = 0x00048003; // Tag id (set physical size)
mailbuffer[c++] = 8; // Value buffer size (bytes)
mailbuffer[c++] = 8; // Req. + value length (bytes)
mailbuffer[c++] = fb.width; // Horizontal resolution
mailbuffer[c++] = fb.height; // Vertical resolution
mailbuffer[c++] = 0x00048004; // Tag id (set virtual size)
mailbuffer[c++] = 8; // Value buffer size (bytes)
mailbuffer[c++] = 8; // Req. + value length (bytes)
mailbuffer[c++] = fb.width; // Horizontal resolution
mailbuffer[c++] = fb.height; // Vertical resolution
mailbuffer[c++] = 0x00048005; // Tag id (set depth)
mailbuffer[c++] = 4; // Value buffer size (bytes)
mailbuffer[c++] = 4; // Req. + value length (bytes)
mailbuffer[c++] = 32; // 32 bpp
mailbuffer[c++] = 0x00040001; // Tag id (allocate framebuffer)
mailbuffer[c++] = 8; // Value buffer size (bytes)
mailbuffer[c++] = 4; // Req. + value length (bytes)
mailbuffer[c++] = 16; // Alignment = 16
mailbuffer[c++] = 0; // Space for response
mailbuffer[c++] = 0; // Terminating tag
mailbuffer[0] = c*4; // Buffer size
write(mailbuffer, FBCHAN);
buf = (uint32_t *)read(FBCHAN);
/* Valid response in data structure */
if(buf[1] != 0x80000000) return FAIL_SETUP_FRAMEBUFFER;
// Scan replies for allocate response
unsigned int i = 2; /* First tag */
uint32_t data;
while ((data = buf[i])) {
// allocate response?
if (data == 0x40001) break;
/* Skip to next tag
* Advance count by 1 (tag) + 2 (buffer size/value size)
* + specified buffer size
*/
i += 3 + (buf[i + 1] >> 2);
if (i > c) return FAIL_INVALID_TAGS;
}
/* 8 bytes, plus MSB set to indicate a response */
if (buf[i + 2] != 0x80000008) return FAIL_INVALID_TAG_RESPONSE;
/* Framebuffer address/size in response */
fb.base = buf[i + 3];
fb.size = buf[i + 4];
if (fb.base == 0 || fb.size == 0) return FAIL_INVALID_TAG_DATA;
// fb.base += 0xC0000000; // physical to virtual
/* Get the framebuffer pitch (bytes per line) */
mailbuffer[0] = 7 * 4; // Total size
mailbuffer[1] = 0; // Request
mailbuffer[2] = 0x40008; // Display size
mailbuffer[3] = 4; // Buffer size
mailbuffer[4] = 0; // Request size
mailbuffer[5] = 0; // Space for pitch
mailbuffer[6] = 0; // End tag
write(mailbuffer, FBCHAN);
buf = (uint32_t *)read(FBCHAN);
/* 4 bytes, plus MSB set to indicate a response */
if (buf[4] != 0x80000004) return FAIL_INVALID_PITCH_RESPONSE;
fb.pitch = buf[5];
if (fb.pitch == 0) return FAIL_INVALID_PITCH_DATA;
// set alpha to 0xff everywhere
for(uint32_t n = 3; n < fb.size; n += 4) {
*(uint8_t*)(fb.base + n) = 0xff;
}
// draw chessboard pattern
for(uint32_t y = 0; y < fb.height; ++y) {
for(uint32_t x = 0; x < fb.width; ++x) {
Pixel *p = (Pixel*)(fb.base + x * sizeof(Pixel) + y * fb.pitch);
uint8_t col = ((x & 16) ^ (y & 16)) ? 0x00 : 0xff;
p->red = col;
p->green = col;
p->blue = col;
}
}
// draw back->red fade left to right at the top
// draw back->blue fade left to right at the bottom
for(int y = 0; y < 16; ++y) {
for(int x = 16; x < 256 + 16; ++x) {
Pixel *p = (Pixel*)(fb.base + x * sizeof(Pixel) + y * fb.pitch);
p->red = x - 16;
p->green = 0;
p->blue = 0;
p = (Pixel*)(fb.base + x * sizeof(Pixel) + (fb.height - y - 1) * fb.pitch);
p->red = 0;
p->green = 0;
p->blue = x - 16;
}
}
// draw back->green fade top to bottom at the left
// draw back->green fade top to bottom at the right
for(int y = 16; y < 256 + 16; ++y) {
for(int x = 0; x < 16; ++x) {
Pixel *p = (Pixel*)(fb.base + x * sizeof(Pixel) + y * fb.pitch);
p->red = 0;
p->green = y - 16;
p->blue = 0;
p = (Pixel*)(fb.base + (fb.width - x- 1) * sizeof(Pixel) + y * fb.pitch);
p->red = y - 16;
p->green = y - 16;
p->blue = y - 16;
}
}
const char text[] = "MOOSE V0.0";
struct Arg {
uint32_t color;
uint32_t border;
bool fill;
} args[] = {
{~0LU, 0, false},
{ 0, ~0LU, false},
{~0LU, 0, true},
{ 0, ~0LU, true},
{0xff0000ff, 0, false},
{0xff0000ff, ~0LU, false},
{0xff0000ff, 0, true},
{0xff0000ff, ~0LU, true},
{0xff00ff00, 0, false},
{0xff00ff00, ~0LU, false},
{0xff00ff00, 0, true},
{0xff00ff00, ~0LU, true},
{0xffff0000, 0, false},
{0xffff0000, ~0LU, false},
{0xffff0000, 0, true},
{0xffff0000, ~0LU, true},
};
int y = 152;
Arg *arg = args;
for (i = 0; i < 16; ++i) {
int x = 152;
for (const char *p = text; *p; ++p) {
Font::putc(fb, x, y, *p, arg->color, arg->border, arg->fill);
x += 8;
}
y += 16;
++arg;
}
return SUCCESS;
}
}