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Remove cycle counting and timers from mini-rv32ima

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This commit is contained in:
Toby Jaffey 2025-12-14 11:19:23 +00:00
parent a693fed59c
commit 861c75d80e
3 changed files with 15 additions and 2 deletions
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16
uvm32/mini-rv32ima.h
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@ -74,14 +74,14 @@ struct MiniRV32IMAState
uint32_t pc;
uint32_t mstatus;
#ifndef MINIRV32_NO_TIMERS_NO_CYCLES
uint32_t cyclel;
uint32_t cycleh;
uint32_t timerl;
uint32_t timerh;
uint32_t timermatchl;
uint32_t timermatchh;
#endif
uint32_t mscratch;
uint32_t mtvec;
uint32_t mie;
@ -117,6 +117,7 @@ MINIRV32_DECORATE int32_t MiniRV32IMAStep(void *userdata, struct MiniRV32IMAStat
MINIRV32_STEPPROTO
#endif
{
#ifndef MINIRV32_NO_TIMERS_NO_CYCLES
uint32_t new_timer = CSR( timerl ) + elapsedUs;
if( new_timer < CSR( timerl ) ) CSR( timerh )++;
CSR( timerl ) = new_timer;
@ -133,12 +134,16 @@ MINIRV32_STEPPROTO
// If WFI, don't run processor.
if( CSR( extraflags ) & 4 )
return 1;
#endif
uint32_t trap = 0;
uint32_t rval = 0;
uint32_t pc = CSR( pc );
#ifndef MINIRV32_NO_TIMERS_NO_CYCLES
uint32_t cycle = CSR( cyclel );
#endif
#ifndef MINIRV32_NO_TIMERS_NO_CYCLES
if( ( CSR( mip ) & (1<<7) ) && ( CSR( mie ) & (1<<7) /*mtie*/ ) && ( CSR( mstatus ) & 0x8 /*mie*/) )
{
// Timer interrupt.
@ -146,11 +151,14 @@ MINIRV32_STEPPROTO
pc -= 4;
}
else // No timer interrupt? Execute a bunch of instructions.
#endif
for( int icount = 0; icount < count; icount++ )
{
uint32_t ir = 0;
rval = 0;
#ifndef MINIRV32_NO_TIMERS_NO_CYCLES
cycle++;
#endif
uint32_t ofs_pc = pc - MINIRV32_RAM_IMAGE_OFFSET;
if( ofs_pc >= MINI_RV32_RAM_SIZE )
@ -347,7 +355,9 @@ MINIRV32_STEPPROTO
case 0x340: rval = CSR( mscratch ); break;
case 0x305: rval = CSR( mtvec ); break;
case 0x304: rval = CSR( mie ); break;
#ifndef MINIRV32_NO_TIMERS_NO_CYCLES
case 0xC00: rval = cycle; break;
#endif
case 0x344: rval = CSR( mip ); break;
case 0x341: rval = CSR( mepc ); break;
case 0x300: rval = CSR( mstatus ); break; //mstatus
@ -530,8 +540,10 @@ MINIRV32_STEPPROTO
#endif
}
#ifndef MINIRV32_NO_TIMERS_NO_CYCLES
if( CSR( cyclel ) > cycle ) CSR( cycleh )++;
SETCSR( cyclel, cycle );
#endif
SETCSR( pc, pc );
return 0;
}

1
uvm32/uvm32.h
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@ -41,6 +41,7 @@ SOFTWARE.
// Setup and hooks for mini-rv32ima emulator core
#define MINIRV32_DECORATE static
#define MINIRV32_RETURN_TRAP
#define MINIRV32_NO_TIMERS_NO_CYCLES
#define MINI_RV32_RAM_SIZE UVM32_MEMORY_SIZE
#define MINIRV32_POSTEXEC(pc, ir, retval) {if (retval > 0) return retval;}
uint32_t _uvm32_extramLoad(void *userdata, uint32_t addr, uint32_t accessTyp);