#include "spr-defs.h"
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#include "spr-defs.h"
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#include "board.h" // For timer rate (IN_CLK, TICKS_PER_SEC)
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#include "board.h" // For timer rate (IN_CLK, TICKS_PER_SEC)
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#include <or1k-support-defs.h>
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#include <or1k-support-defs.h>
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extern int main();
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/* For writing into SPR. */
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/* For writing into SPR. */
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void
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void
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mtspr(unsigned long spr, unsigned long value)
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mtspr(unsigned long spr, unsigned long value)
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{
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{
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asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value));
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asm("l.mtspr\t\t%0,%1,0": : "r" (spr), "r" (value));
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}
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}
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/* For reading SPR. */
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/* For reading SPR. */
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unsigned long
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unsigned long
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mfspr(unsigned long spr)
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mfspr(unsigned long spr)
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{
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{
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unsigned long value;
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unsigned long value;
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asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr));
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asm("l.mfspr\t\t%0,%1,0" : "=r" (value) : "r" (spr));
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return value;
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return value;
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}
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}
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/* Print out a character via simulator */
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/* Print out a character via simulator */
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void
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void
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sim_putc(unsigned char c)
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sim_putc(unsigned char c)
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{
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{
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asm("l.addi\tr3,%0,0": :"r" (c));
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asm("l.addi\tr3,%0,0": :"r" (c));
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asm("l.nop %0": :"K" (NOP_PUTC));
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asm("l.nop %0": :"K" (NOP_PUTC));
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}
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}
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/* print long */
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/* print long */
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void
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void
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report(unsigned long value)
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report(unsigned long value)
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{
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{
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asm("l.addi\tr3,%0,0": :"r" (value));
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asm("l.addi\tr3,%0,0": :"r" (value));
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asm("l.nop %0": :"K" (NOP_REPORT));
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asm("l.nop %0": :"K" (NOP_REPORT));
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}
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}
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/* Loops/exits simulation */
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/* Loops/exits simulation */
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void
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void
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exit (int i)
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exit (int i)
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{
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{
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asm("l.add r3,r0,%0": : "r" (i));
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asm("l.add r3,r0,%0": : "r" (i));
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asm("l.nop %0": :"K" (NOP_EXIT));
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asm("l.nop %0": :"K" (NOP_EXIT));
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while (1);
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while (1);
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}
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}
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/* Enable user interrupts */
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/* Enable user interrupts */
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void
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void
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cpu_enable_user_interrupts(void)
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cpu_enable_user_interrupts(void)
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{
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{
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/* Enable interrupts in supervisor register */
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/* Enable interrupts in supervisor register */
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mtspr (SPR_SR, mfspr (SPR_SR) | SPR_SR_IEE);
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mtspr (SPR_SR, mfspr (SPR_SR) | SPR_SR_IEE);
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}
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}
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/* Tick timer variable */
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/* Tick timer variable */
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unsigned long timer_ticks;
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unsigned long timer_ticks;
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/* Tick timer functions */
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/* Tick timer functions */
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/* Enable tick timer and interrupt generation */
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/* Enable tick timer and interrupt generation */
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void
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void
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cpu_enable_timer(void)
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cpu_enable_timer(void)
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{
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{
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mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | ((IN_CLK/TICKS_PER_SEC) &
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mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT | ((IN_CLK/TICKS_PER_SEC) &
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SPR_TTMR_PERIOD));
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SPR_TTMR_PERIOD));
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mtspr(SPR_SR, SPR_SR_TEE | mfspr(SPR_SR));
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mtspr(SPR_SR, SPR_SR_TEE | mfspr(SPR_SR));
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}
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}
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/* Disable tick timer and interrupt generation */
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/* Disable tick timer and interrupt generation */
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void
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void
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cpu_disable_timer(void)
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cpu_disable_timer(void)
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{
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{
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// Disable timer: clear it all!
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// Disable timer: clear it all!
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mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_TEE);
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mtspr (SPR_SR, mfspr (SPR_SR) & ~SPR_SR_TEE);
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mtspr(SPR_TTMR, 0);
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mtspr(SPR_TTMR, 0);
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}
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}
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/* Timer increment - called by interrupt routine */
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/* Timer increment - called by interrupt routine */
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void
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void
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cpu_timer_tick(void)
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cpu_timer_tick(void)
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{
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{
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timer_ticks++;
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timer_ticks++;
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// Reset timer mode register to interrupt with same interval
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// Reset timer mode register to interrupt with same interval
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mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT |
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mtspr(SPR_TTMR, SPR_TTMR_IE | SPR_TTMR_RT |
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((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD));
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((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD));
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}
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}
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/* Reset tick counter */
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/* Reset tick counter */
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void
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void
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cpu_reset_timer_ticks(void)
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cpu_reset_timer_ticks(void)
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{
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{
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timer_ticks=0;
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timer_ticks=0;
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}
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}
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/* Get tick counter */
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/* Get tick counter */
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unsigned long
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unsigned long
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cpu_get_timer_ticks(void)
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cpu_get_timer_ticks(void)
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{
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{
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return timer_ticks;
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return timer_ticks;
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}
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}
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/* Wait for 10ms, assumes CLK_HZ is 100, which it usually is.
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/* Wait for 10ms, assumes CLK_HZ is 100, which it usually is.
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Will be slightly inaccurate!*/
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Will be slightly inaccurate!*/
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void
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void
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cpu_sleep_10ms(void)
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cpu_sleep_10ms(void)
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{
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{
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unsigned long ttcr = mfspr(SPR_TTCR) & SPR_TTCR_PERIOD;
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unsigned long ttcr = mfspr(SPR_TTCR) & SPR_TTCR_PERIOD;
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unsigned long first_time = cpu_get_timer_ticks();
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unsigned long first_time = cpu_get_timer_ticks();
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while (first_time == cpu_get_timer_ticks()); // Wait for tick to occur
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while (first_time == cpu_get_timer_ticks()); // Wait for tick to occur
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// Now wait until we're past the tick value we read before to know we've
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// Now wait until we're past the tick value we read before to know we've
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// gone at least enough
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// gone at least enough
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while(ttcr > (mfspr(SPR_TTCR) & SPR_TTCR_PERIOD));
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while(ttcr > (mfspr(SPR_TTCR) & SPR_TTCR_PERIOD));
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}
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}
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extern char _erodata, _sdata, _edata, _bstart, _bend;
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void __main (void){ //initial_global_data
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char *src = &_erodata; //start of Data section in Rom
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char *dst = &_sdata;
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/* ROM has data at end of rodata; copy it. */
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while (dst < &_edata) {
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*dst++ = *src++;
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}
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main(); //call the main function
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}
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No newline at end of file
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No newline at end of file
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