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folkert van heusden 2022-03-26 17:17:10 +01:00
parent 70d7b58d43
commit 1d4b9ba073
1 changed files with 24 additions and 8 deletions
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32
bus.cpp
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@ -308,22 +308,30 @@ uint16_t bus::read(const uint16_t a, const bool word_mode, const bool use_prev)
else if (use_prev)
run_mode = (c->getPSW() >> 12) & 3;
uint32_t m_offset = pages[run_mode][apf].par * 64;
uint32_t m_offset = pages[run_mode][apf].par * 64; // memory offset
m_offset += a & 8191;
uint16_t p_offset = a & 8191; // page offset
if (m_offset >= n_pages * 8192) {
m_offset += p_offset;
uint16_t pdr_len = (((pages[run_mode][apf].pdr >> 8) & 127) + 1) * 64;
if (p_offset >= pdr_len && (MMR0 & 1)) {
D(fprintf(stderr, "bus::read::p_offset %o >= %o\n", p_offset, pdr_len);)
c->schedule_trap(04); // invalid address
}
else if (m_offset >= n_pages * 8192) {
D(fprintf(stderr, "bus::read %o >= %o\n", m_offset, n_pages * 8192);)
c->schedule_trap(04); // invalid address
}
D(fprintf(stderr, "BUS read from %o (pages: %o, run mode %d, apf %d)\n", m_offset, pages[run_mode][apf].par, run_mode, apf);)
if (word_mode)
temp = m -> readByte(m_offset);
else
temp = m -> readWord(m_offset);
D(fprintf(stderr, "BUS read from %o (pages: %o/%o/%o, run mode %d, apf %d, PDR: %06o): %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, temp);)
return temp;
}
@ -583,14 +591,22 @@ uint16_t bus::write(const uint16_t a, const bool word_mode, uint16_t value, cons
pages[run_mode][apf].pdr |= 1 << 6; // page has been written to
m_offset += a & 8191;
uint16_t p_offset = a & 8191; // page offset
if (m_offset >= n_pages * 8192) {
m_offset += p_offset;
uint16_t pdr_len = (((pages[run_mode][apf].pdr >> 8) & 127) + 1)* 64;
if (p_offset >= pdr_len && (MMR0 & 1)) {
D(fprintf(stderr, "bus::write::p_offset %o >= %o\n", p_offset, pdr_len);)
c->schedule_trap(04); // invalid address
}
else if (m_offset >= n_pages * 8192) {
D(fprintf(stderr, "bus::write %o >= %o\n", m_offset, n_pages * 8192);)
c->schedule_trap(04); // invalid address
}
D(fprintf(stderr, "BUS write to %o (pages: %o, run mode %d, apf %d)\n", m_offset, pages[run_mode][apf].par, run_mode, apf);)
D(fprintf(stderr, "BUS write to %o (pages: %o/%o/%o, run mode %d, apf %d, PDR: %06o): %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, value);)
if (word_mode)
m->writeByte(m_offset, value);