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xenos.c
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xenos.c
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/* xenos.c - pseudo framebuffer driver for Xenos on Xbox 360
*
* Copyright (C) 2007, 2008 Georg Lukas <[email protected]>
*
* Based on code by Felix Domke <[email protected]>
*
* This software is provided under the GNU GPL License v2.
*/
#include <cache.h>
#include <types.h>
#include <string.h>
#include <vsprintf.h>
#include "version.h"
/* activate NATIVE_RESOLUTION to change the screen resolution and disable
* scaling. This won't work on 1080i */
//#define NATIVE_RESOLUTION 1
/* reinit xenos from scratch. so far this supports only 640x480 */
#define REINIT_VIDEO 1
/* activate BUFFER_PREINIT to enable storing of the xell output before the
* xenos framebuffer is initialized. This should help with SMP issues. */
#define BUFFER_PREINIT
int xenos_width, xenos_height,
xenos_size;
void xenos_lowlevel_init(void);
/* Colors in BGRA: background and foreground */
#ifdef DEFAULT_THEME
uint32_t xenos_color[2] = { 0x00000000, 0xFFC0C000 };
#else
uint32_t xenos_color[2] = { 0xD8444E00, 0xFF96A300 };
#endif
/* can't initialize xenos_fb with zero due to late BSS init,
* instead init it in xenos_preinit() */
unsigned char *xenos_fb;
int cursor_x, cursor_y,
max_x, max_y,
offset_x, offset_y;
struct ati_info {
uint32_t unknown1[4];
uint32_t base;
uint32_t unknown2[8];
uint32_t width;
uint32_t height;
};
/* set a pixel to RGB values, must call xenos_init() first */
inline void xenos_pset32(int x, int y, int color)
{
#define fbint ((uint32_t*)xenos_fb)
#define base (((y >> 5)*32*xenos_width + ((x >> 5)<<10) \
+ (x&3) + ((y&1)<<2) + (((x&31)>>2)<<3) + (((y&31)>>1)<<6)) ^ ((y&8)<<2))
fbint[base] = color;
#undef fbint
#undef base
}
inline void xenos_pset(int x, int y, unsigned char r, unsigned char g, unsigned char b) {
xenos_pset32(x, y, (b<<24) + (g<<16) + (r<<8));
/* little indian:
* fbint[base] = b + (g<<8) + (r<<16); */
}
extern const unsigned char fontdata_8x16[4096];
void xenos_draw_char(const int x, const int y, const unsigned char c) {
#define font_pixel(ch, x, y) ((fontdata_8x16[ch*16+y]>>(7-x))&1)
int lx, ly;
for (ly=0; ly < 16; ly++)
for (lx=0; lx < 8; lx++) {
xenos_pset32(x+lx, y+ly, xenos_color[font_pixel(c, lx, ly)]);
}
}
void xenos_clrscr(const unsigned int bgra) {
uint32_t *fb = (uint32_t*)xenos_fb;
int count = xenos_size;
while (count--)
*fb++ = bgra;
dcache_flush(xenos_fb, xenos_size*4);
}
void xenos_scroll32(const unsigned int lines) {
int l, bs;
bs = xenos_width*32*4;
/* copy all tile blocks to a higher position */
for (l=lines; l*32 < xenos_height; l++) {
memcpy(xenos_fb + bs*(l-lines),
xenos_fb + bs*l,
bs);
}
/* fill up last lines with background color */
uint32_t *fb = (uint32_t*)(xenos_fb + xenos_size*4 - bs*lines);
uint32_t *end = (uint32_t*)(xenos_fb + xenos_size*4);
while (fb != end)
*fb++ = xenos_color[0];
dcache_flush(xenos_fb, xenos_size*4);
}
void xenos_newline() {
#if 0
/* fill up with spaces */
while (cursor_x*8 < xenos_width) {
xenos_draw_char(cursor_x*8 + offset_x, cursor_y*16 + offset_y, ' ');
cursor_x++;
}
#endif
/* reset to the left */
cursor_x = 0;
cursor_y++;
if (cursor_y >= max_y) {
/* XXX implement scrolling */
xenos_scroll32(1);
cursor_y -= 2;
}
}
static inline void xenos_putch_impl(const char c) {
if (c == '\t') {
/* move to the next multiple of 8 */
cursor_x += 7;
cursor_x &= ~7;
} else if (c == '\r') {
cursor_x = 0;
} else if (c == '\n') {
xenos_newline();
} else {
xenos_draw_char(cursor_x*8 + offset_x, cursor_y*16 + offset_y, c);
cursor_x++;
if (cursor_x >= max_x)
xenos_newline();
}
}
#ifdef BUFFER_PREINIT
/* size of the srollback buffer */
#define BUFFER 2048
int bufpos = 0;
unsigned char buffer[BUFFER];
#endif
void xenos_putch(const char c) {
if (!xenos_fb) {
#ifdef BUFFER_PREINIT
buffer[bufpos++] = c;
if (bufpos == BUFFER)
bufpos--;
#else
return;
#endif
} else {
xenos_putch_impl(c);
dcache_flush(xenos_fb, xenos_size*4);
}
}
/* This was added to improve userfriendlyness */
char* xenos_ascii = "\n"
" ######################################################\n"
" # ########################## #### ##\n"
" # ############################### ##### ## ## #\n"
" # ############################### ######### #### #\n"
" # ######## # #### #### ### #### #### #\n"
" # #### # ## # ## # ## ### ### #### #\n"
" # ######## ####### ## ## ##### ## #### #\n"
" # ######## ####### ##### ##### ##### ## #### #\n"
" # ######## ####### # ## # ### ### ## ## #\n"
" # ######## ######## #### ##### ##### ##\n"
" ######################################################\n"
" XeLL - Xenon Linux Loader " VERSION "\n\n";
void xenos_asciiart() {
char *p = xenos_ascii;
while (*p)
xenos_putch_impl(*p++);
dcache_flush(xenos_fb, xenos_size*4);
}
void xenos_init() {
struct ati_info *ai = (struct ati_info*)0x80000200ec806100ULL;
#if REINIT_VIDEO
xenos_lowlevel_init();
#elif NATIVE_RESOLUTION
uint32_t *gfx = (uint32_t*)0x80000200ec806000ULL;
/* setup native resolution, i.e. disable scaling */
int vxres = gfx[0x134/4];
int vyres = gfx[0x138/4];
int scl_h = gfx[0x5b4/4], scl_v = gfx[0x5c4/4];
if (gfx[0x590/4] == 0)
scl_h = scl_v = 0x01000000;
int interlaced = gfx[0x30/4];
int black_top = gfx[0x44/4];
int offset = gfx[0x580/4];
int _offset_x = (offset >> 16) & 0xFFFF;
int _offset_y = offset & 0xFFFF;
printf(" - virtual resolution: %d x %d\n", vxres, vyres);
printf(" - offset: x=%d, y=%d\n", _offset_x, _offset_y);
printf(" - black: %d %d, %d %d\n",
gfx[0x44/4], gfx[0x48/4], gfx[0x4c/4], gfx[0x50/4]);
printf(" - interlace flag: %x\n", interlaced);
int nxres = (vxres - _offset_x * 2) * 0x1000 / (scl_h/0x1000);
int nyres = (vyres - _offset_y * 2) * 0x1000 / (scl_v/0x1000) + black_top * 2;
printf(" - native resolution: %d x %d\n", nxres, nyres);
/* do not change res for interlaced mode! */
if (!interlaced) {
gfx[0x44/4] = 0; // disable black bar
gfx[0x48/4] = 0;
gfx[0x4c/4] = 0;
gfx[0x50/4] = 0;
gfx[0x590/4] = 0; // disable scaling
gfx[0x584/4] = (nxres << 16) | nyres;
gfx[0x580/4] = 0; // disable offset
gfx[0x5e8/4] = (nxres * 4) / 0x10 - 1; // fix pitch
gfx[0x134/4] = nxres;
gfx[0x138/4] = nyres;
}
#endif
xenos_fb = (unsigned char*)((long)(ai->base) | 0x8000000000000000ULL);
/* round up size to tiles of 32x32 */
xenos_width = ((ai->width+31)>>5)<<5;
xenos_height = ((ai->height+31)>>5)<<5;
xenos_size = xenos_width*xenos_height;
cursor_x = cursor_y = 0;
if (xenos_height <= 576)
{
offset_x = 50;
offset_y = 50;
}
cursor_x = cursor_y = 0;
max_x = (ai->width - offset_x * 2) / 8;
max_y = (ai->height - offset_y * 2) / 16;
/* XXX use memset_io() instead? */
xenos_clrscr(xenos_color[0]);
#ifdef BUFFER_PREINIT
int pos;
for (pos = 0; pos < bufpos; pos++)
xenos_putch_impl(buffer[pos]);
if (bufpos == BUFFER - 1)
printf(" * Xenos FB BUFFER overrun!\n");
#endif
printf(" * Xenos FB with %dx%d (%dx%d) at %p initialized.\n",
max_x, max_y, ai->width, ai->height, xenos_fb);
xenos_asciiart();
}