#include "common.h"
#include "config.h"
#include "sim.h"
+#include "mmu.h"
#include "htif.h"
#include "disasm.h"
#include <cinttypes>
{
parse_isa_string(isa);
- mmu = new mmu_t(sim->mem, sim->memsz);
- mmu->set_processor(this);
+ mmu = new mmu_t(sim, this);
reset(true);
memset(this, 0, sizeof(*this));
prv = PRV_M;
pc = DEFAULT_RSTVEC;
+ mtvec = DEFAULT_MTVEC;
load_reservation = -1;
}
void processor_t::take_interrupt()
{
- check_timer();
-
reg_t pending_interrupts = state.mip & state.mie;
reg_t mie = get_field(state.mstatus, MSTATUS_MIE);
raise_interrupt(ctz(enabled_interrupts));
}
-void processor_t::check_timer()
-{
- if (sim->rtc >= state.mtimecmp)
- state.mip |= MIP_MTIP;
-}
-
static bool validate_priv(reg_t priv)
{
return priv == PRV_U || priv == PRV_S || priv == PRV_M;
set_csr(CSR_MSTATUS, s);
set_privilege(PRV_S);
} else {
- state.pc = DEFAULT_MTVEC;
+ state.pc = state.mtvec;
state.mcause = t.cause();
state.mepc = epc;
if (t.has_badaddr())
void processor_t::set_csr(int which, reg_t val)
{
val = zext_xlen(val);
- reg_t delegable_ints = MIP_SSIP | MIP_STIP | (1 << IRQ_HOST) | (1 << IRQ_COP);
+ reg_t delegable_ints = MIP_SSIP | MIP_STIP | MIP_SEIP | (1 << IRQ_COP);
reg_t all_ints = delegable_ints | MIP_MSIP | MIP_MTIP;
switch (which)
{
break;
}
case CSR_MIP: {
- reg_t mask = MIP_SSIP | MIP_STIP | MIP_MSIP;
+ reg_t mask = MIP_SSIP | MIP_STIP;
state.mip = (state.mip & ~mask) | (val & mask);
break;
}
- case CSR_MIPI:
- state.mip = set_field(state.mip, MIP_MSIP, val & 1);
- break;
case CSR_MIE:
state.mie = (state.mie & ~all_ints) | (val & all_ints);
break;
case CSR_SCAUSE: state.scause = val; break;
case CSR_SBADADDR: state.sbadaddr = val; break;
case CSR_MEPC: state.mepc = val; break;
+ case CSR_MTVEC: state.mtvec = val >> 2 << 2; break;
case CSR_MSCRATCH: state.mscratch = val; break;
case CSR_MCAUSE: state.mcause = val; break;
case CSR_MBADADDR: state.mbadaddr = val; break;
- case CSR_MTIMECMP:
- state.mip &= ~MIP_MTIP;
- state.mtimecmp = val;
- break;
- case CSR_MTOHOST:
- if (state.tohost == 0)
- state.tohost = val;
- break;
- case CSR_MFROMHOST:
- state.mip = (state.mip & ~(1 << IRQ_HOST)) | (val ? (1 << IRQ_HOST) : 0);
- state.fromhost = val;
- break;
}
}
case CSR_MSCYCLE_DELTAH: if (xlen > 32) break; else return 0;
case CSR_MSTIME_DELTAH: if (xlen > 32) break; else return 0;
case CSR_MSINSTRET_DELTAH: if (xlen > 32) break; else return 0;
- case CSR_MTIME: return sim->rtc;
case CSR_MCYCLE: return state.minstret;
case CSR_MINSTRET: return state.minstret;
- case CSR_MTIMEH: if (xlen > 32) break; else return sim->rtc >> 32;
case CSR_MCYCLEH: if (xlen > 32) break; else return state.minstret >> 32;
case CSR_MINSTRETH: if (xlen > 32) break; else return state.minstret >> 32;
case CSR_SSTATUS: {
case CSR_SSCRATCH: return state.sscratch;
case CSR_MSTATUS: return state.mstatus;
case CSR_MIP: return state.mip;
- case CSR_MIPI: return 0;
case CSR_MIE: return state.mie;
case CSR_MEPC: return state.mepc;
case CSR_MSCRATCH: return state.mscratch;
case CSR_MCAUSE: return state.mcause;
case CSR_MBADADDR: return state.mbadaddr;
- case CSR_MTIMECMP: return state.mtimecmp;
case CSR_MISA: return isa;
case CSR_MARCHID: return 0;
case CSR_MIMPID: return 0;
case CSR_MVENDORID: return 0;
case CSR_MHARTID: return id;
- case CSR_MTVEC: return DEFAULT_MTVEC;
+ case CSR_MTVEC: return state.mtvec;
case CSR_MEDELEG: return state.medeleg;
case CSR_MIDELEG: return state.mideleg;
- case CSR_MTOHOST:
- sim->get_htif()->tick(); // not necessary, but faster
- return state.tohost;
- case CSR_MFROMHOST:
- sim->get_htif()->tick(); // not necessary, but faster
- return state.fromhost;
- case CSR_MCFGADDR: return sim->memsz;
}
throw trap_illegal_instruction();
}
bool processor_t::load(reg_t addr, size_t len, uint8_t* bytes)
{
- try {
- auto res = get_csr(addr / (max_xlen / 8));
- memcpy(bytes, &res, len);
- return true;
- } catch (trap_illegal_instruction& t) {
- return false;
- }
+ return false;
}
bool processor_t::store(reg_t addr, size_t len, const uint8_t* bytes)
{
- try {
- reg_t value = 0;
- memcpy(&value, bytes, len);
- set_csr(addr / (max_xlen / 8), value);
- return true;
- } catch (trap_illegal_instruction& t) {
- return false;
+ switch (addr)
+ {
+ case 0:
+ state.mip &= ~MIP_MSIP;
+ if (bytes[0] & 1)
+ state.mip |= MIP_MSIP;
+ return true;
+
+ default:
+ return false;
}
}