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when mmu is disabled; flat mapping

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folkert van heusden 2022-04-09 14:39:47 +02:00
parent cfaf1e4385
commit 788f86a283
1 changed files with 41 additions and 28 deletions
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69
bus.cpp
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@ -301,18 +301,20 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev)
return -1; return -1;
} }
const uint8_t apf = a >> 13; // active page field uint32_t m_offset = 0;
if (use_prev)
run_mode = (c->getPSW() >> 12) & 3;
uint32_t m_offset = pages[run_mode][apf].par * 64; // memory offset
uint16_t p_offset = a & 8191; // page offset
m_offset += p_offset;
if (MMR0 & 1) { if (MMR0 & 1) {
const uint8_t apf = a >> 13; // active page field
if (use_prev)
run_mode = (c->getPSW() >> 12) & 3;
m_offset = pages[run_mode][apf].par * 64; // memory offset
uint16_t p_offset = a & 8191; // page offset
m_offset += p_offset;
uint16_t pdr_len = (((pages[run_mode][apf].pdr >> 8) & 127) + 1) * 64; uint16_t pdr_len = (((pages[run_mode][apf].pdr >> 8) & 127) + 1) * 64;
bool direction = pages[run_mode][apf].pdr & 8; bool direction = pages[run_mode][apf].pdr & 8;
@ -334,6 +336,12 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev)
throw 1; throw 1;
} }
D(fprintf(stderr, "READ from physical address %07o (run_mode: %d, par: %o)\n", m_offset, run_mode, pages[run_mode][apf].par);)
}
else {
m_offset = a;
D(fprintf(stderr, "READ from physical address %07o\n", m_offset);)
} }
if (word_mode) if (word_mode)
@ -341,8 +349,6 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev)
else else
temp = m -> readWord(m_offset); temp = m -> readWord(m_offset);
// D(fprintf(stderr, "BUS read from %o (pages: %o/%o/%o, run mode %d, apf %d, PDR: %06o, b22: %d): %06o\n", m_offset, pages[run_mode][apf].par, pages[run_mode][apf].par * 64, n_pages * 8192, run_mode, apf, pages[run_mode][apf].pdr, MMR3 & 16, temp);)
return temp; return temp;
} }
@ -594,27 +600,29 @@ uint16_t bus::write(const uint16_t a, const bool word_mode, uint16_t value, cons
return value; return value;
} }
const uint8_t apf = a >> 13; // active page field uint32_t m_offset = 0;
if (use_prev)
run_mode = (c->getPSW() >> 12) & 3;
uint32_t m_offset = pages[run_mode][apf].par * 64;
pages[run_mode][apf].pdr |= 1 << 6; // page has been written to
uint16_t p_offset = a & 8191; // page offset
m_offset += p_offset;
if (MMR0 & 1) { if (MMR0 & 1) {
const uint8_t apf = a >> 13; // active page field
if (use_prev)
run_mode = (c->getPSW() >> 12) & 3;
m_offset = pages[run_mode][apf].par * 64;
pages[run_mode][apf].pdr |= 1 << 6; // page has been written to
uint16_t p_offset = a & 8191; // page offset
m_offset += p_offset;
uint16_t pdr_len = (((pages[run_mode][apf].pdr >> 8) & 127) + 1)* 64; uint16_t pdr_len = (((pages[run_mode][apf].pdr >> 8) & 127) + 1)* 64;
bool direction = pages[run_mode][apf].pdr & 8; bool direction = pages[run_mode][apf].pdr & 8;
if (m_offset >= n_pages * 8192) { if (m_offset >= n_pages * 8192) {
D(fprintf(stderr, "bus::write %o >= %o\n", m_offset, n_pages * 8192);) D(fprintf(stderr, "bus::write %o >= %o\n", m_offset, n_pages * 8192);)
c->schedule_trap(04); // invalid address c->schedule_trap(04); // invalid address
pages[run_mode][apf].pdr |= 1 << 7; pages[run_mode][apf].pdr |= 1 << 7;
@ -623,15 +631,20 @@ uint16_t bus::write(const uint16_t a, const bool word_mode, uint16_t value, cons
if ((p_offset >= pdr_len && direction == false) || (p_offset < pdr_len && direction == true)) { if ((p_offset >= pdr_len && direction == false) || (p_offset < pdr_len && direction == true)) {
D(fprintf(stderr, "bus::write::p_offset %o >= %o\n", p_offset, pdr_len);) D(fprintf(stderr, "bus::write::p_offset %o >= %o\n", p_offset, pdr_len);)
c->schedule_trap(0250); // invalid access c->schedule_trap(0250); // invalid access
pages[run_mode][apf].pdr |= 1 << 7; pages[run_mode][apf].pdr |= 1 << 7;
throw 1; throw 1;
} }
}
// D(fprintf(stderr, "BUS write to %o (pages: %o/%o/%o, run mode %d, apf %d, PDR: %06o, b22: %d): %06o\n", m_offset, pages[run_mode][apf].par, pages[run_mode][apf].par * 64, n_pages * 8192, run_mode, apf, pages[run_mode][apf].pdr, MMR3 & 16, value);) D(fprintf(stderr, "WRITE to physical address %07o: %o (run mode %d, PAR: %o)\n", m_offset, value, run_mode, pages[run_mode][apf].par);)
}
else {
m_offset = a;
D(fprintf(stderr, "WRITE to physical address %07o: %o\n", m_offset, value);)
}
if (word_mode) if (word_mode)
m->writeByte(m_offset, value); m->writeByte(m_offset, value);