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gpsp/main.c

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/* gameplaySP
*
* Copyright (C) 2006 Exophase <exophase@gmail.com>
*
* 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 2 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "common.h"
#include <ctype.h>
#ifdef PSP_BUILD
//PSP_MODULE_INFO("gpSP", 0x1000, 0, 6);
//PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER);
void vblank_interrupt_handler(u32 sub, u32 *parg);
#endif
timer_type timer[4];
//debug_state current_debug_state = COUNTDOWN_BREAKPOINT;
//debug_state current_debug_state = PC_BREAKPOINT;
u32 breakpoint_value = 0x7c5000;
debug_state current_debug_state = RUN;
//debug_state current_debug_state = STEP_RUN;
//u32 breakpoint_value = 0;
frameskip_type current_frameskip_type = auto_frameskip;
u32 global_cycles_per_instruction = 1;
u32 random_skip = 0;
u32 fps_debug = 0;
u32 frameskip_value = 2;
u64 last_frame_interval_timestamp;
u32 skip_next_frame = 0;
u32 frameskip_counter = 0;
u32 cpu_ticks = 0;
u32 frame_ticks = 0;
u32 execute_cycles = 960;
s32 video_count = 960;
u32 ticks;
u32 arm_frame = 0;
u32 thumb_frame = 0;
u32 last_frame = 0;
u32 cycle_memory_access = 0;
u32 cycle_pc_relative_access = 0;
u32 cycle_sp_relative_access = 0;
u32 cycle_block_memory_access = 0;
u32 cycle_block_memory_sp_access = 0;
u32 cycle_block_memory_words = 0;
u32 cycle_dma16_words = 0;
u32 cycle_dma32_words = 0;
u32 flush_ram_count = 0;
u32 gbc_update_count = 0;
u32 oam_update_count = 0;
u32 synchronize_flag = 1;
u32 update_backup_flag = 1;
u32 clock_speed = 333;
char main_path[512];
void trigger_ext_event();
#define check_count(count_var) \
if(count_var < execute_cycles) \
execute_cycles = count_var; \
#define check_timer(timer_number) \
if(timer[timer_number].status == TIMER_PRESCALE) \
check_count(timer[timer_number].count); \
#define update_timer(timer_number) \
if(timer[timer_number].status != TIMER_INACTIVE) \
{ \
if(timer[timer_number].status != TIMER_CASCADE) \
{ \
timer[timer_number].count -= execute_cycles; \
io_registers[REG_TM##timer_number##D] = \
-(timer[timer_number].count >> timer[timer_number].prescale); \
} \
\
if(timer[timer_number].count <= 0) \
{ \
if(timer[timer_number].irq == TIMER_TRIGGER_IRQ) \
irq_raised |= IRQ_TIMER##timer_number; \
\
if((timer_number != 3) && \
(timer[timer_number + 1].status == TIMER_CASCADE)) \
{ \
timer[timer_number + 1].count--; \
io_registers[REG_TM0D + (timer_number + 1) * 2] = \
-(timer[timer_number + 1].count); \
} \
\
if(timer_number < 2) \
{ \
if(timer[timer_number].direct_sound_channels & 0x01) \
sound_timer(timer[timer_number].frequency_step, 0); \
\
if(timer[timer_number].direct_sound_channels & 0x02) \
sound_timer(timer[timer_number].frequency_step, 1); \
} \
\
timer[timer_number].count += \
(timer[timer_number].reload << timer[timer_number].prescale); \
} \
} \
static const char *file_ext[] = { ".gba", ".bin", ".zip", NULL };
#ifndef PSP_BUILD
static void ChangeWorkingDirectory(char *exe)
{
char *s = strrchr(exe, '/');
if (s != NULL) {
*s = '\0';
chdir(exe);
*s = '/';
}
}
static void switch_to_romdir(void)
{
char buff[256];
int r;
file_open(romdir_file, "romdir.txt", read);
if(file_check_valid(romdir_file))
{
r = file_read(romdir_file, buff, sizeof(buff) - 1);
if (r > 0)
{
buff[r] = 0;
while (r > 0 && isspace(buff[r-1]))
buff[--r] = 0;
chdir(buff);
}
file_close(romdir_file);
}
}
static void save_romdir(void)
{
char buff[512];
snprintf(buff, sizeof(buff), "%s" PATH_SEPARATOR "romdir.txt", main_path);
file_open(romdir_file, buff, write);
if(file_check_valid(romdir_file))
{
if (getcwd(buff, sizeof(buff)))
{
file_write(romdir_file, buff, strlen(buff));
}
file_close(romdir_file);
}
}
#else
void ChangeWorkingDirectory(char *exe) {}
static void switch_to_romdir(void) {}
static void save_romdir(void) {}
#endif
void init_main()
{
u32 i;
skip_next_frame = 0;
for(i = 0; i < 4; i++)
{
dma[i].start_type = DMA_INACTIVE;
dma[i].direct_sound_channel = DMA_NO_DIRECT_SOUND;
timer[i].status = TIMER_INACTIVE;
timer[i].reload = 0x10000;
timer[i].stop_cpu_ticks = 0;
}
timer[0].direct_sound_channels = TIMER_DS_CHANNEL_BOTH;
timer[1].direct_sound_channels = TIMER_DS_CHANNEL_NONE;
cpu_ticks = 0;
frame_ticks = 0;
execute_cycles = 960;
video_count = 960;
flush_translation_cache_rom();
flush_translation_cache_ram();
flush_translation_cache_bios();
}
#ifndef __LIBRETRO__
int main(int argc, char *argv[])
{
char bios_filename[512];
int ret;
#ifdef PSP_BUILD
sceKernelRegisterSubIntrHandler(PSP_VBLANK_INT, 0,
vblank_interrupt_handler, NULL);
sceKernelEnableSubIntr(PSP_VBLANK_INT, 0);
#endif
init_gamepak_buffer();
// Copy the directory path of the executable into main_path
// ChangeWorkingDirectory will null out the filename out of the path
ChangeWorkingDirectory(argv[0]);
getcwd(main_path, 512);
#ifdef PSP_BUILD
delay_us(2500000);
#endif
#ifndef PC_BUILD
gpsp_plat_init();
#endif
load_config_file();
gamepak_filename[0] = 0;
init_video();
sprintf(bios_filename, "%s" PATH_SEPARATOR "%s", main_path, "gba_bios.bin");
ret = load_bios(bios_filename);
if (ret != 0)
ret = load_bios("gba_bios.bin");
if (ret != 0)
{
gui_action_type gui_action = CURSOR_NONE;
debug_screen_start();
debug_screen_printl(" ");
debug_screen_printl("Sorry, but gpSP requires a Gameboy Advance BIOS ");
debug_screen_printl("image to run correctly. Make sure to get an ");
debug_screen_printl("authentic one, it'll be exactly 16384 bytes large ");
debug_screen_printl("and should have the following md5sum value: ");
debug_screen_printl(" ");
debug_screen_printl("a860e8c0b6d573d191e4ec7db1b1e4f6 ");
debug_screen_printl(" ");
debug_screen_printl("When you do get it name it gba_bios.bin and put it");
debug_screen_printl("in the same directory as gpSP. ");
debug_screen_printl(" ");
debug_screen_printl("Press any button to exit. ");
debug_screen_update();
while(gui_action == CURSOR_NONE)
{
gui_action = get_gui_input();
delay_us(15000);
}
debug_screen_end();
quit();
}
if(bios_rom[0] != 0x18)
{
gui_action_type gui_action = CURSOR_NONE;
debug_screen_start();
debug_screen_printl("You have an incorrect BIOS image. ");
debug_screen_printl("While many games will work fine, some will not. It");
debug_screen_printl("is strongly recommended that you obtain the ");
debug_screen_printl("correct BIOS file. Do NOT report any bugs if you ");
debug_screen_printl("are seeing this message. ");
debug_screen_printl(" ");
debug_screen_printl("Press any button to resume, at your own risk. ");
debug_screen_update();
while(gui_action == CURSOR_NONE)
{
gui_action = get_gui_input();
delay_us(15000);
}
debug_screen_end();
}
init_main();
init_sound(1);
init_input();
video_resolution_large();
if(argc > 1)
{
if(load_gamepak(argv[1]) == -1)
{
#ifndef PSP_BUILD
printf("Failed to load gamepak %s, exiting.\n", argv[1]);
#endif
exit(-1);
}
set_gba_resolution(screen_scale);
video_resolution_small();
init_cpu();
init_memory();
}
else
{
char load_filename[512];
switch_to_romdir();
if(load_file(file_ext, load_filename) == -1)
{
menu(copy_screen());
}
else
{
if(load_gamepak(load_filename) == -1)
{
#ifndef PSP_BUILD
printf("Failed to load gamepak %s, exiting.\n", load_filename);
#endif
exit(-1);
}
set_clock_speed();
set_gba_resolution(screen_scale);
video_resolution_small();
init_cpu();
init_memory();
}
}
last_frame = 0;
// We'll never actually return from here.
#ifdef PSP_BUILD
execute_arm_translate(execute_cycles);
#else
/* u8 current_savestate_filename[512];
get_savestate_filename_noshot(savestate_slot,
current_savestate_filename);
load_state(current_savestate_filename); */
// debug_on();
if(argc > 2)
{
current_debug_state = COUNTDOWN_BREAKPOINT;
breakpoint_value = strtol(argv[2], NULL, 16);
}
trigger_ext_event();
execute_arm_translate(execute_cycles);
execute_arm(execute_cycles);
#endif
return 0;
}
#endif
void print_memory_stats(u32 *counter, u32 *region_stats, char *stats_str)
{
u32 other_region_counter = region_stats[0x1] + region_stats[0xE] +
region_stats[0xF];
u32 rom_region_counter = region_stats[0x8] + region_stats[0x9] +
region_stats[0xA] + region_stats[0xB] + region_stats[0xC] +
region_stats[0xD];
u32 _counter = *counter;
printf("memory access stats: %s (out of %d)\n", stats_str, _counter);
printf("bios: %f%%\tiwram: %f%%\tewram: %f%%\tvram: %f\n",
region_stats[0x0] * 100.0 / _counter, region_stats[0x3] * 100.0 /
_counter,
region_stats[0x2] * 100.0 / _counter, region_stats[0x6] * 100.0 /
_counter);
printf("oam: %f%%\tpalette: %f%%\trom: %f%%\tother: %f%%\n",
region_stats[0x7] * 100.0 / _counter, region_stats[0x5] * 100.0 /
_counter,
rom_region_counter * 100.0 / _counter, other_region_counter * 100.0 /
_counter);
*counter = 0;
memset(region_stats, 0, sizeof(u32) * 16);
}
u32 event_cycles = 0;
const u32 event_cycles_trigger = 60 * 5;
u32 no_alpha = 0;
void trigger_ext_event()
{
static u32 event_number = 0;
static u64 benchmark_ticks[16];
u64 new_ticks;
char current_savestate_filename[512];
return;
if(event_number)
{
get_ticks_us(&new_ticks);
benchmark_ticks[event_number - 1] =
new_ticks - benchmark_ticks[event_number - 1];
}
current_frameskip_type = no_frameskip;
no_alpha = 0;
synchronize_flag = 0;
get_savestate_filename_noshot(savestate_slot,
current_savestate_filename);
load_state(current_savestate_filename);
switch(event_number)
{
case 0:
// Full benchmark, run normally
break;
case 1:
// No alpha blending
no_alpha = 1;
break;
case 2:
// No video benchmark
// Set frameskip really high + manual
current_frameskip_type = manual_frameskip;
frameskip_value = 1000000;
break;
case 3:
// No CPU benchmark
// Put CPU in halt mode, put it in IRQ mode with interrupts off
reg[CPU_HALT_STATE] = CPU_HALT;
reg[REG_CPSR] = 0xD2;
break;
case 4:
// No CPU or video benchmark
reg[CPU_HALT_STATE] = CPU_HALT;
reg[REG_CPSR] = 0xD2;
current_frameskip_type = manual_frameskip;
frameskip_value = 1000000;
break;
case 5:
{
// Done
char *print_strings[] =
{
"Full test ",
"No blending ",
"No video ",
"No CPU ",
"No CPU/video",
"CPU speed ",
"Video speed ",
"Alpha cost "
};
u32 i;
benchmark_ticks[6] = benchmark_ticks[0] - benchmark_ticks[2];
benchmark_ticks[5] = benchmark_ticks[0] - benchmark_ticks[4] -
benchmark_ticks[6];
benchmark_ticks[7] = benchmark_ticks[0] - benchmark_ticks[1];
printf("Benchmark results (%d frames): \n", event_cycles_trigger);
for(i = 0; i < 8; i++)
{
printf(" %s: %d ms (%f ms per frame)\n",
print_strings[i], (u32)benchmark_ticks[i] / 1000,
(float)(benchmark_ticks[i] / (1000.0 * event_cycles_trigger)));
if(i == 4)
printf("\n");
}
quit();
}
}
event_cycles = 0;
get_ticks_us(benchmark_ticks + event_number);
event_number++;
}
#ifndef __LIBRETRO__
static u32 fps = 60;
static u32 frames_drawn = 60;
#endif
u32 update_gba()
{
irq_type irq_raised = IRQ_NONE;
do
{
cpu_ticks += execute_cycles;
reg[CHANGED_PC_STATUS] = 0;
if(gbc_sound_update)
{
gbc_update_count++;
update_gbc_sound(cpu_ticks);
gbc_sound_update = 0;
}
update_timer(0);
update_timer(1);
update_timer(2);
update_timer(3);
video_count -= execute_cycles;
if(video_count <= 0)
{
u32 vcount = io_registers[REG_VCOUNT];
u32 dispstat = io_registers[REG_DISPSTAT];
if((dispstat & 0x02) == 0)
{
// Transition from hrefresh to hblank
video_count += (272);
dispstat |= 0x02;
if((dispstat & 0x01) == 0)
{
u32 i;
if(oam_update)
oam_update_count++;
if(no_alpha)
io_registers[REG_BLDCNT] = 0;
update_scanline();
// If in visible area also fire HDMA
for(i = 0; i < 4; i++)
{
if(dma[i].start_type == DMA_START_HBLANK)
dma_transfer(dma + i);
}
}
if(dispstat & 0x10)
irq_raised |= IRQ_HBLANK;
}
else
{
// Transition from hblank to next line
video_count += 960;
dispstat &= ~0x02;
vcount++;
if(vcount == 160)
{
// Transition from vrefresh to vblank
u32 i;
dispstat |= 0x01;
if(dispstat & 0x8)
{
irq_raised |= IRQ_VBLANK;
}
affine_reference_x[0] =
(s32)(address32(io_registers, 0x28) << 4) >> 4;
affine_reference_y[0] =
(s32)(address32(io_registers, 0x2C) << 4) >> 4;
affine_reference_x[1] =
(s32)(address32(io_registers, 0x38) << 4) >> 4;
affine_reference_y[1] =
(s32)(address32(io_registers, 0x3C) << 4) >> 4;
for(i = 0; i < 4; i++)
{
if(dma[i].start_type == DMA_START_VBLANK)
dma_transfer(dma + i);
}
}
else
if(vcount == 228)
{
// Transition from vblank to next screen
dispstat &= ~0x01;
frame_ticks++;
#ifdef PC_BUILD
/* printf("frame update (%x), %d instructions total, %d RAM flushes\n",
reg[REG_PC], instruction_count - last_frame, flush_ram_count);
last_frame = instruction_count;
*/
/* printf("%d gbc audio updates\n", gbc_update_count);
printf("%d oam updates\n", oam_update_count); */
gbc_update_count = 0;
oam_update_count = 0;
flush_ram_count = 0;
#endif
#ifdef __LIBRETRO__
switch_to_main_thread();
update_gbc_sound(cpu_ticks);
gbc_sound_update = 0;
#else
if(update_input())
continue;
update_gbc_sound(cpu_ticks);
if(fps_debug)
{
char print_buffer[32];
sprintf(print_buffer, "%2d (%2d)", fps, frames_drawn);
print_string(print_buffer, 0xFFFF, 0x000, 0, 0);
}
if(!synchronize_flag)
print_string("-FF-", 0xFFFF, 0x000, 216, 0);
update_screen();
synchronize();
if(update_backup_flag)
update_backup();
#endif
process_cheats();
event_cycles++;
if(event_cycles == event_cycles_trigger)
{
trigger_ext_event();
continue;
}
vcount = 0;
}
if(vcount == (dispstat >> 8))
{
// vcount trigger
dispstat |= 0x04;
if(dispstat & 0x20)
{
irq_raised |= IRQ_VCOUNT;
}
}
else
{
dispstat &= ~0x04;
}
io_registers[REG_VCOUNT] = vcount;
}
io_registers[REG_DISPSTAT] = dispstat;
}
if(irq_raised)
raise_interrupt(irq_raised);
execute_cycles = video_count;
check_timer(0);
check_timer(1);
check_timer(2);
check_timer(3);
} while(reg[CPU_HALT_STATE] != CPU_ACTIVE);
return execute_cycles;
}
#ifdef PSP_BUILD
u32 real_frame_count = 0;
u32 virtual_frame_count = 0;
u32 num_skipped_frames = 0;
void vblank_interrupt_handler(u32 sub, u32 *parg)
{
real_frame_count++;
}
void synchronize()
{
char char_buffer[64];
u64 new_ticks, time_delta;
s32 used_frameskip = frameskip_value;
if(!synchronize_flag)
{
used_frameskip = 4;
virtual_frame_count = real_frame_count - 1;
}
skip_next_frame = 0;
virtual_frame_count++;
if(real_frame_count >= virtual_frame_count)
{
if((real_frame_count > virtual_frame_count) &&
(current_frameskip_type == auto_frameskip) &&
(num_skipped_frames < frameskip_value))
{
skip_next_frame = 1;
num_skipped_frames++;
}
else
{
virtual_frame_count = real_frame_count;
num_skipped_frames = 0;
}
// Here so that the home button return will eventually work.
// If it's not running fullspeed anyway this won't really hurt
// it much more.
delay_us(1);
}
else
{
if(synchronize_flag)
sceDisplayWaitVblankStart();
}
if(current_frameskip_type == manual_frameskip)
{
frameskip_counter = (frameskip_counter + 1) %
(used_frameskip + 1);
if(random_skip)
{
if(frameskip_counter != (rand() % (used_frameskip + 1)))
skip_next_frame = 1;
}
else
{
if(frameskip_counter)
skip_next_frame = 1;
}
}
/* sprintf(char_buffer, "%08d %08d %d %d %d\n",
real_frame_count, virtual_frame_count, num_skipped_frames,
real_frame_count - virtual_frame_count, skip_next_frame);
print_string(char_buffer, 0xFFFF, 0x0000, 0, 10); */
/*
sprintf(char_buffer, "%02d %02d %06d %07d", frameskip, (u32)ms_needed,
ram_translation_ptr - ram_translation_cache, rom_translation_ptr -
rom_translation_cache);
print_string(char_buffer, 0xFFFF, 0x0000, 0, 0);
*/
}
#elif defined(__LIBRETRO__)
#else
u32 real_frame_count = 0;
u32 virtual_frame_count = 0;
u32 num_skipped_frames = 0;
u32 interval_skipped_frames;
u32 frames;
const u32 frame_interval = 60;
void synchronize()
{
u64 new_ticks;
u64 time_delta;
get_ticks_us(&new_ticks);
skip_next_frame = 0;
virtual_frame_count++;
real_frame_count = (new_ticks * 3) / 50000;
if(real_frame_count >= virtual_frame_count)
{
if((real_frame_count > virtual_frame_count) &&
(current_frameskip_type == auto_frameskip) &&
(num_skipped_frames < frameskip_value))
{
skip_next_frame = 1;
num_skipped_frames++;
}
else
{
virtual_frame_count = real_frame_count;
num_skipped_frames = 0;
}
}
else if (synchronize_flag)
{
delay_us((u64)virtual_frame_count * 50000 / 3 - new_ticks + 2);
}
frames++;
if(frames == frame_interval)
{
u32 new_fps;
u32 new_frames_drawn;
time_delta = new_ticks - last_frame_interval_timestamp;
new_fps = (u64)((u64)1000000 * (u64)frame_interval) / time_delta;
new_frames_drawn =
(frame_interval - interval_skipped_frames) * (60 / frame_interval);
// Left open for rolling averages
fps = new_fps;
frames_drawn = new_frames_drawn;
last_frame_interval_timestamp = new_ticks;
interval_skipped_frames = 0;
frames = 0;
}
if(current_frameskip_type == manual_frameskip)
{
frameskip_counter = (frameskip_counter + 1) %
(frameskip_value + 1);
if(random_skip)
{
if(frameskip_counter != (rand() % (frameskip_value + 1)))
skip_next_frame = 1;
}
else
{
if(frameskip_counter)
skip_next_frame = 1;
}
}
interval_skipped_frames += skip_next_frame;
char char_buffer[64];
sprintf(char_buffer, "gpSP: %2d (%2d) fps", fps, frames_drawn);
SDL_WM_SetCaption(char_buffer, "gpSP");
}
#endif
void quit()
{
save_romdir();
if(!update_backup_flag)
update_backup_force();
sound_exit();
#ifndef __LIBRETRO__
#ifdef REGISTER_USAGE_ANALYZE
print_register_usage();
#endif
#ifdef PSP_BUILD
sceKernelExitGame();
#else
SDL_Quit();
#ifndef PC_BUILD
gpsp_plat_quit();
#endif
exit(0);
#endif
#endif
}
void reset_gba()
{
init_main();
init_memory();
init_cpu();
reset_sound();
}
#ifdef PSP_BUILD
u32 file_length(char *filename, s32 dummy)
{
SceIoStat stats;
sceIoGetstat(filename, &stats);
return stats.st_size;
}
void delay_us(u32 us_count)
{
sceKernelDelayThread(us_count);
}
void get_ticks_us(u64 *tick_return)
{
u64 ticks;
sceRtcGetCurrentTick(&ticks);
*tick_return = (ticks * 1000000) / sceRtcGetTickResolution();
}
#else
u32 file_length(const char *dummy, FILE *fp)
{
u32 length;
fseek(fp, 0, SEEK_END);
length = ftell(fp);
fseek(fp, 0, SEEK_SET);
return length;
}
#ifdef __LIBRETRO__
#elif defined(PC_BUILD)
void delay_us(u32 us_count)
{
SDL_Delay(us_count / 1000);
}
void get_ticks_us(u64 *ticks_return)
{
*ticks_return = (u64)SDL_GetTicks() * 1000;
}
#else
void delay_us(u32 us_count)
{
//usleep(us_count);
SDL_Delay(us_count / 1000);
}
void get_ticks_us(u64 *ticks_return)
{
struct timeval current_time;
gettimeofday(&current_time, NULL);
*ticks_return =
(u64)current_time.tv_sec * 1000000 + current_time.tv_usec;
}
#endif
#endif
void change_ext(const char *src, char *buffer, const char *extension)
{
char *dot_position;
strcpy(buffer, src);
dot_position = strrchr(buffer, '.');
if(dot_position)
strcpy(dot_position, extension);
}
// make path: <main_path>/<romname>.<ext>
void make_rpath(char *buff, size_t size, const char *ext)
{
char *p;
p = strrchr(gamepak_filename, PATH_SEPARATOR_CHAR);
if (p == NULL)
p = gamepak_filename;
snprintf(buff, size, "%s/%s", main_path, p);
p = strrchr(buff, '.');
if (p != NULL)
strcpy(p, ext);
}
#define main_savestate_builder(type) \
void main_##type##_savestate(file_tag_type savestate_file) \
{ \
file_##type##_variable(savestate_file, cpu_ticks); \
file_##type##_variable(savestate_file, execute_cycles); \
file_##type##_variable(savestate_file, video_count); \
file_##type##_array(savestate_file, timer); \
} \
main_savestate_builder(read);
main_savestate_builder(write_mem);
void printout(void *str, u32 val)
{
printf(str, val);
}
void set_clock_speed()
{
static u32 clock_speed_old = default_clock_speed;
if (clock_speed != clock_speed_old)
{
printf("about to set CPU clock to %iMHz\n", clock_speed);
#ifdef PSP_BUILD
scePowerSetClockFrequency(clock_speed, clock_speed, clock_speed / 2);
#endif
clock_speed_old = clock_speed;
}
}
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