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m68kmmu: support flushing ATC by FC/EA (nw)

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This commit is contained in:
Sven Schnelle 2018-11-04 20:05:07 +01:00
parent 19ec3796ab
commit 6a3c52faec
1 changed files with 51 additions and 9 deletions
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60
src/devices/cpu/m68000/m68kmmu.h
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@ -126,9 +126,7 @@ void pmmu_atc_add(uint32_t logical, uint32_t physical, int fc, const int rw)
{
// get page size (i.e. # of bits to ignore); is 10 for Apollo
int ps = (m_mmu_tc >> 20) & 0xf;
// Note: exact emulation would use (logical >> ps) << (ps-8)
uint32_t atc_tag = M68K_MMU_ATC_VALID | ((fc & 7) << 24) | logical >> ps;
const uint32_t atc_tag = M68K_MMU_ATC_VALID | ((fc & 7) << 24) | ((logical >> ps) << (ps - 8));
uint32_t atc_data = (physical >> ps) << (ps - 8);
@ -198,13 +196,61 @@ void pmmu_atc_flush()
m_mmu_atc_rr = 0;
}
void pmmu_atc_flush_fc_ea(const uint16_t modes)
{
const int fcmask = (modes >> 5) & 7;
const int fc = fc_from_modes(modes) & fcmask;
const int ps = (m_mmu_tc >> 16) & 0xf;
const int mode = (modes >> 10) & 7;
uint32_t ea;
switch (mode)
{
case 1: // PFLUSHA
pmmu_atc_flush();
break;
case 4: // flush by fc
MMULOG("flush by fc: %d, mask %d\n", fc, fcmask);
for (auto &e: m_mmu_atc_tag)
{
if ((e & M68K_MMU_ATC_VALID) && ((e >> 24) & fcmask) == fc)
{
MMULOG("flushing entry %08x\n", e);
e = 0;
}
}
break;
case 6: // flush by fc + ea
ea = DECODE_EA_32(m_ir);
MMULOG("flush by fc/ea: fc %d, mask %d, ea %08x\n", fc, fcmask, ea);
for (auto &e: m_mmu_atc_tag)
{
if ((e & M68K_MMU_ATC_VALID) &&
(((e >> 24) & fcmask) == fc) &&
(((e >> ps) << (ps - 8)) == ((ea >> ps) << (ps - 8))))
{
MMULOG("flushing entry %08x\n", e);
e = 0;
}
}
break;
default:
logerror("PFLUSH mode %d not supported\n", mode);
break;
}
}
template<bool ptest>
bool pmmu_atc_lookup(const uint32_t addr_in, const int fc, const bool rw,
uint32_t& addr_out)
{
MMULOG("%s: LOOKUP addr_in=%08x, fc=%d, ptest=%d\n", __func__, addr_in, fc, ptest);
const int ps = (m_mmu_tc >> 20) & 0xf;
const uint32_t atc_tag = M68K_MMU_ATC_VALID | ((fc & 7) << 24) | (addr_in >> ps);
const uint32_t atc_tag = M68K_MMU_ATC_VALID | ((fc & 7) << 24) | ((addr_in >> ps) << (ps - 8));
for (int i = 0; i < MMU_ATC_ENTRIES; i++)
{
@ -1183,11 +1229,7 @@ void m68851_mmu_ops()
}
else if ((modes & 0xe200) == 0x2000) // PFLUSH
{
if (((modes >> 10) & 7) != 1)
{
logerror("PFLUSH by fc/ea not supported\n");
}
pmmu_atc_flush();
pmmu_atc_flush_fc_ea(modes);
return;
}
else if (modes == 0xa000) // PFLUSHR