folkert/KEK
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Set bit 12 to 1 if trap

Browse source
This commit is contained in:
folkert van heusden 2022-06-17 20:42:26 +02:00
parent 8432071f9f
commit 4b788bb620
4 changed files with 15 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
bus.cpp
View file

@ -318,6 +318,14 @@ void bus::setMMR0(int value)
MMR0 = value;
}
void bus::setMMR0Bit(const int bit)
{
assert(bit != 10 && bit != 11);
assert(bit < 16 && bit >= 0);
MMR0 |= 1 << bit;
}
void bus::setMMR2(const uint16_t value)
{
MMR2 = value;
@ -350,8 +358,6 @@ uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, c
MMR0 |= 1 << 13; // read-only
MMR0 |= 1 << 12; // trap
MMR0 &= ~(3 << 5);
MMR0 |= run_mode << 5; // TODO: kernel-mode or user-mode when a trap occurs in user-mode?
@ -367,8 +373,6 @@ uint32_t bus::calculate_physical_address(const int run_mode, const uint16_t a, c
MMR0 |= 1 << 13; // read-only
MMR0 |= 1 << 12; // trap
MMR0 &= ~(3 << 5);
MMR0 |= run_mode << 5;

1
bus.h
View file

@ -84,6 +84,7 @@ public:
void clearMMR1();
void addToMMR1(const int8_t delta, const uint8_t reg);
void setMMR0(int value);
void setMMR0Bit(const int bit);
void setMMR2(const uint16_t value);
uint16_t get_switch_register() const { return switch_register; }

7
cpu.cpp
View file

@ -280,7 +280,7 @@ bool cpu::check_queued_interrupts()
DOLOG(debug, true, "Invoking interrupt vector %o (IPL %d, current: %d)", v, i, current_level);
trap(v, i);
trap(v, i, true);
return true;
}
@ -1647,7 +1647,7 @@ void cpu::schedule_trap(const uint16_t vector)
scheduled_trap = vector;
}
void cpu::trap(const uint16_t vector, const int new_ipl)
void cpu::trap(const uint16_t vector, const int new_ipl, const bool is_interrupt)
{
uint16_t before_psw = getPSW();
uint16_t before_pc = getPC();
@ -1661,6 +1661,9 @@ void cpu::trap(const uint16_t vector, const int new_ipl)
b->addToMMR1(-2, 6);
}
if (!is_interrupt)
b->setMMR0Bit(12); // it's a trap
setPC(b->readWord(vector + 0));
// switch to kernel mode & update 'previous mode'

2
cpu.h
View file

@ -96,7 +96,7 @@ public:
void queue_interrupt(const uint8_t level, const uint8_t vector);
void busError();
void trap(const uint16_t vector, const int new_ipl = -1);
void trap(const uint16_t vector, const int new_ipl = -1, const bool is_interrupt = false);
void schedule_trap(const uint16_t vector);
void setEmulateMFPT(const bool v) { emulateMFPT = v; }