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MMR0

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folkert van heusden 2022-04-13 21:22:09 +02:00
parent a90547c3d1
commit 87e181a8e2
1 changed files with 22 additions and 10 deletions
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32
bus.cpp
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@ -332,23 +332,35 @@ uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, c
m_offset += p_offset; m_offset += p_offset;
if (trap_on_failure) { if (trap_on_failure) {
int access_control = pages[run_mode][0][apf].pdr & 7; if (MMR0 & (1 << 9)) {
int access_control = pages[run_mode][0][apf].pdr & 7;
if (is_write && access_control != 6) { // write if (is_write && access_control != 6) { // write
c->schedule_trap(04); // invalid address
pages[run_mode][0][apf].pdr |= 1 << 7; // TODO: D/I
throw 1;
}
else if (!is_write) { // read
if (access_control == 0 || access_control == 1 || access_control == 3 || access_control == 4 || access_control == 7) {
c->schedule_trap(04); // invalid address c->schedule_trap(04); // invalid address
pages[run_mode][0][apf].pdr |= 1 << 7; // TODO: D/I pages[run_mode][0][apf].pdr |= 1 << 7; // TODO: D/I
MMR0 |= 1 << 12;
MMR0 &= ~(3 << 5);
MMR0 |= run_mode << 5; // TODO: kernel-mode or user-mode when a trap occurs in user-mode?
throw 1; throw 1;
} }
else if (!is_write) { // read
if (access_control == 0 || access_control == 1 || access_control == 3 || access_control == 4 || access_control == 7) {
c->schedule_trap(04); // invalid address
pages[run_mode][0][apf].pdr |= 1 << 7; // TODO: D/I
MMR0 |= 1 << 12;
MMR0 &= ~(3 << 5);
MMR0 |= run_mode << 5;
throw 1;
}
}
} }
uint16_t pdr_len = (((pages[run_mode][0][apf].pdr >> 8) & 127) + 1) * 64; // TODO: D/I uint16_t pdr_len = (((pages[run_mode][0][apf].pdr >> 8) & 127) + 1) * 64; // TODO: D/I