96 lines
1.7 KiB
C
96 lines
1.7 KiB
C
#include "u.h"
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#include "../port/lib.h"
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#include "mem.h"
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#include "dat.h"
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#include "fns.h"
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#include "io.h"
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#include "../port/error.h"
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#include "msaturn.h"
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enum {
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Timer_ctrl = Saturn + 0x0106,
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Timer0_load = Saturn + 0x0200,
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Timer0_cnt = Saturn + 0x0204,
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Timer1_load = Saturn + 0x0300,
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Timer1_cnt = Saturn + 0x0304,
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T0_event = RBIT(13, ushort),
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T0_ie = RBIT(14, ushort),
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T0_cen = RBIT(15, ushort),
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T1_event = RBIT(5, ushort),
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T1_ie = RBIT(6, ushort),
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T1_cen = RBIT(7, ushort),
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};
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static ulong ticks;
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static Lock tlock;
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static ushort timer_ctl;
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void
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saturntimerintr(Ureg *u, void*)
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{
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ushort ctl = *(ushort*)Timer_ctrl, v = 0;
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if(ctl&T1_event){
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v = T1_event;
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ticks++;
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}
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*(ushort*)Timer_ctrl = timer_ctl|T0_event|v;
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intack();
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timerintr(u, 0);
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}
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void
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timerinit(void)
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{
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*(ushort*)Timer_ctrl = 0;
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*(ulong*)Timer0_load = m->bushz / HZ;
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*(ulong*)Timer0_cnt = m->bushz / HZ;
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*(ulong*)Timer1_load = m->bushz;
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*(ulong*)Timer1_cnt = m->bushz;
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intrenable(Vectimer0, saturntimerintr, nil, "timer");
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timer_ctl = T0_cen|T0_ie|T1_cen;
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*(ushort*)Timer_ctrl = timer_ctl;
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}
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uvlong
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fastticks(uvlong *hz)
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{
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assert(*(ushort*)Timer_ctrl&T1_cen);
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if(*(ushort*)Timer_ctrl&T1_event){
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*(ushort*)Timer_ctrl = timer_ctl|T1_event;
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ticks++;
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}
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if (hz)
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*hz = m->bushz;
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return (uvlong)ticks*m->bushz+(uvlong)(m->bushz-*(ulong*)Timer1_cnt);
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}
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void
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timerset(uvlong next)
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{
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ulong offset;
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uvlong now;
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ilock(&tlock);
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*(ushort*)Timer_ctrl = T1_cen;
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now = fastticks(nil);
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offset = next - now;
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if((long)offset < 10000)
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offset = 10000;
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else if(offset > m->bushz)
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offset = m->bushz;
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*(ulong*)Timer0_cnt = offset;
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*(ushort*)Timer_ctrl = timer_ctl;
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assert(*(ushort*)Timer_ctrl & T1_cen);
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iunlock(&tlock);
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}
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