368 lines
9.3 KiB
C++
368 lines
9.3 KiB
C++
#include <cassert>
|
|
#include <cstring>
|
|
|
|
#include "bus.h" // for (at least) ADDR_PSW
|
|
#include "gen.h"
|
|
#include "log.h"
|
|
#include "mmu.h"
|
|
#include "utils.h"
|
|
|
|
|
|
mmu::mmu()
|
|
{
|
|
}
|
|
|
|
mmu::~mmu()
|
|
{
|
|
}
|
|
|
|
void mmu::begin()
|
|
{
|
|
reset();
|
|
}
|
|
|
|
void mmu::reset()
|
|
{
|
|
memset(pages, 0x00, sizeof pages);
|
|
|
|
CPUERR = MMR0 = MMR1 = MMR2 = MMR3 = PIR = CSR = 0;
|
|
}
|
|
|
|
uint16_t mmu::read_pdr(const uint32_t a, const int run_mode)
|
|
{
|
|
int page = (a >> 1) & 7;
|
|
bool is_d = a & 16;
|
|
uint16_t t = pages[run_mode][is_d][page].pdr;
|
|
|
|
return t;
|
|
}
|
|
|
|
uint16_t mmu::read_par(const uint32_t a, const int run_mode)
|
|
{
|
|
int page = (a >> 1) & 7;
|
|
bool is_d = a & 16;
|
|
uint16_t t = pages[run_mode][is_d][page].par;
|
|
|
|
return t;
|
|
}
|
|
|
|
void mmu::setMMR0(uint16_t value)
|
|
{
|
|
value &= ~(3 << 10); // bit 10 & 11 always read as 0
|
|
|
|
if (value & 1)
|
|
value &= ~(7l << 13); // reset error bits
|
|
|
|
if (MMR0 & 0160000) {
|
|
if ((value & 1) == 0)
|
|
value &= 254; // bits 7...1 are protected
|
|
}
|
|
|
|
MMR0 = value;
|
|
}
|
|
|
|
void mmu::setMMR0Bit(const int bit)
|
|
{
|
|
assert(bit != 10 && bit != 11);
|
|
assert(bit < 16 && bit >= 0);
|
|
|
|
MMR0 |= 1 << bit;
|
|
}
|
|
|
|
void mmu::clearMMR0Bit(const int bit)
|
|
{
|
|
assert(bit != 10 && bit != 11);
|
|
assert(bit < 16 && bit >= 0);
|
|
|
|
MMR0 &= ~(1 << bit);
|
|
}
|
|
|
|
void mmu::setMMR2(const uint16_t value)
|
|
{
|
|
MMR2 = value;
|
|
}
|
|
|
|
void mmu::setMMR3(const uint16_t value)
|
|
{
|
|
MMR3 = value;
|
|
}
|
|
|
|
bool mmu::get_use_data_space(const int run_mode) const
|
|
{
|
|
constexpr const int di_ena_mask[4] = { 4, 2, 0, 1 };
|
|
|
|
return !!(MMR3 & di_ena_mask[run_mode]);
|
|
}
|
|
|
|
void mmu::clearMMR1()
|
|
{
|
|
MMR1 = 0;
|
|
}
|
|
|
|
void mmu::addToMMR1(const int8_t delta, const uint8_t reg)
|
|
{
|
|
assert(reg >= 0 && reg <= 7);
|
|
assert(delta >= -2 && delta <= 2);
|
|
|
|
assert((getMMR0() & 0160000) == 0); // MMR1 should not be locked
|
|
|
|
MMR1 <<= 8;
|
|
|
|
MMR1 |= (delta & 31) << 3;
|
|
MMR1 |= reg;
|
|
}
|
|
|
|
void mmu::write_pdr(const uint32_t a, const int run_mode, const uint16_t value, const word_mode_t word_mode)
|
|
{
|
|
bool is_d = a & 16;
|
|
int page = (a >> 1) & 7;
|
|
|
|
if (word_mode == wm_byte) {
|
|
assert(a != 0 || value < 256);
|
|
|
|
update_word(&pages[run_mode][is_d][page].pdr, a & 1, value);
|
|
}
|
|
else {
|
|
pages[run_mode][is_d][page].pdr = value;
|
|
}
|
|
|
|
pages[run_mode][is_d][page].pdr &= ~(32768 + 128 /*A*/ + 64 /*W*/ + 32 + 16); // set bit 4, 5 & 15 to 0 as they are unused and A/W are set to 0 by writes
|
|
|
|
DOLOG(debug, false, "mmu WRITE-I/O PDR run-mode %d: %c for %d: %o [%d]", run_mode, is_d ? 'D' : 'I', page, value, word_mode);
|
|
}
|
|
|
|
void mmu::write_par(const uint32_t a, const int run_mode, const uint16_t value, const word_mode_t word_mode)
|
|
{
|
|
bool is_d = a & 16;
|
|
int page = (a >> 1) & 7;
|
|
|
|
if (word_mode == wm_byte)
|
|
update_word(&pages[run_mode][is_d][page].par, a & 1, value);
|
|
else
|
|
pages[run_mode][is_d][page].par = value;
|
|
|
|
pages[run_mode][is_d][page].pdr &= ~(128 /*A*/ + 64 /*W*/); // reset PDR A/W when PAR is written to
|
|
|
|
DOLOG(debug, false, "mmu WRITE-I/O PAR run-mode %d: %c for %d: %o (%07o)", run_mode, is_d ? 'D' : 'I', page, word_mode == wm_byte ? value & 0xff : value, pages[run_mode][is_d][page].par * 64);
|
|
}
|
|
|
|
uint16_t mmu::read_word(const uint16_t a)
|
|
{
|
|
uint16_t v = 0;
|
|
|
|
if (a >= ADDR_PDR_SV_START && a < ADDR_PDR_SV_END)
|
|
v = read_pdr(a, 1);
|
|
else if (a >= ADDR_PAR_SV_START && a < ADDR_PAR_SV_END)
|
|
v = read_par(a, 1);
|
|
else if (a >= ADDR_PDR_K_START && a < ADDR_PDR_K_END)
|
|
v = read_pdr(a, 0);
|
|
else if (a >= ADDR_PAR_K_START && a < ADDR_PAR_K_END)
|
|
v = read_par(a, 0);
|
|
else if (a >= ADDR_PDR_U_START && a < ADDR_PDR_U_END)
|
|
v = read_pdr(a, 3);
|
|
else if (a >= ADDR_PAR_U_START && a < ADDR_PAR_U_END)
|
|
v = read_par(a, 3);
|
|
|
|
return v;
|
|
}
|
|
|
|
uint8_t mmu::read_byte(const uint16_t addr)
|
|
{
|
|
uint16_t v = read_word(addr);
|
|
|
|
if (addr & 1)
|
|
return v >> 8;
|
|
|
|
return v;
|
|
}
|
|
|
|
void mmu::write_word(const uint16_t a, const uint16_t value)
|
|
{
|
|
// supervisor
|
|
if (a >= ADDR_PDR_SV_START && a < ADDR_PDR_SV_END)
|
|
write_pdr(a, 1, value, wm_word);
|
|
else if (a >= ADDR_PAR_SV_START && a < ADDR_PAR_SV_END)
|
|
write_par(a, 1, value, wm_word);
|
|
// kernel
|
|
else if (a >= ADDR_PDR_K_START && a < ADDR_PDR_K_END)
|
|
write_pdr(a, 0, value, wm_word);
|
|
else if (a >= ADDR_PAR_K_START && a < ADDR_PAR_K_END)
|
|
write_par(a, 0, value, wm_word);
|
|
// user
|
|
else if (a >= ADDR_PDR_U_START && a < ADDR_PDR_U_END)
|
|
write_pdr(a, 3, value, wm_word);
|
|
else if (a >= ADDR_PAR_U_START && a < ADDR_PAR_U_END)
|
|
write_par(a, 3, value, wm_word);
|
|
}
|
|
|
|
void mmu::write_byte(const uint16_t a, const uint8_t value)
|
|
{
|
|
// supervisor
|
|
if (a >= ADDR_PDR_SV_START && a < ADDR_PDR_SV_END)
|
|
write_pdr(a, 1, value, wm_byte);
|
|
else if (a >= ADDR_PAR_SV_START && a < ADDR_PAR_SV_END)
|
|
write_par(a, 1, value, wm_byte);
|
|
// kernel
|
|
else if (a >= ADDR_PDR_K_START && a < ADDR_PDR_K_END)
|
|
write_pdr(a, 0, value, wm_byte);
|
|
else if (a >= ADDR_PAR_K_START && a < ADDR_PAR_K_END)
|
|
write_par(a, 0, value, wm_byte);
|
|
// user
|
|
else if (a >= ADDR_PDR_U_START && a < ADDR_PDR_U_END)
|
|
write_pdr(a, 3, value, wm_byte);
|
|
else if (a >= ADDR_PAR_U_START && a < ADDR_PAR_U_END)
|
|
write_par(a, 3, value, wm_byte);
|
|
}
|
|
|
|
void mmu::trap_if_odd(const uint16_t a, const int run_mode, const d_i_space_t space, const bool is_write)
|
|
{
|
|
int page = a >> 13;
|
|
|
|
if (is_write)
|
|
set_page_trapped(run_mode, space == d_space, page);
|
|
|
|
MMR0 &= ~(7 << 1);
|
|
MMR0 |= page << 1;
|
|
}
|
|
|
|
memory_addresses_t mmu::calculate_physical_address(const int run_mode, const uint16_t a) const
|
|
{
|
|
const uint8_t apf = a >> 13; // active page field
|
|
|
|
if (is_enabled() == false) {
|
|
bool is_psw = a == ADDR_PSW;
|
|
return { a, apf, a, is_psw, a, is_psw };
|
|
}
|
|
|
|
uint32_t physical_instruction = get_physical_memory_offset(run_mode, 0, apf);
|
|
uint32_t physical_data = get_physical_memory_offset(run_mode, 1, apf);
|
|
|
|
uint16_t p_offset = a & 8191; // page offset
|
|
|
|
physical_instruction += p_offset;
|
|
physical_data += p_offset;
|
|
|
|
if ((getMMR3() & 16) == 0) { // offset is 18bit
|
|
physical_instruction &= 0x3ffff;
|
|
physical_data &= 0x3ffff;
|
|
}
|
|
|
|
if (get_use_data_space(run_mode) == false)
|
|
physical_data = physical_instruction;
|
|
|
|
uint32_t io_base = get_io_base();
|
|
bool physical_instruction_is_psw = (physical_instruction - io_base + 0160000) == ADDR_PSW;
|
|
bool physical_data_is_psw = (physical_data - io_base + 0160000) == ADDR_PSW;
|
|
|
|
return { a, apf, physical_instruction, physical_instruction_is_psw, physical_data, physical_data_is_psw };
|
|
}
|
|
|
|
std::pair<trap_action_t, int> mmu::get_trap_action(const int run_mode, const bool d, const int apf, const bool is_write)
|
|
{
|
|
const int access_control = get_access_control(run_mode, d, apf);
|
|
|
|
trap_action_t trap_action = T_PROCEED;
|
|
|
|
if (access_control == 0)
|
|
trap_action = T_ABORT_4;
|
|
else if (access_control == 1)
|
|
trap_action = is_write ? T_ABORT_4 : T_TRAP_250;
|
|
else if (access_control == 2) {
|
|
if (is_write)
|
|
trap_action = T_ABORT_4;
|
|
}
|
|
else if (access_control == 3)
|
|
trap_action = T_ABORT_4;
|
|
else if (access_control == 4)
|
|
trap_action = T_TRAP_250;
|
|
else if (access_control == 5) {
|
|
if (is_write)
|
|
trap_action = T_TRAP_250;
|
|
}
|
|
else if (access_control == 6) {
|
|
// proceed
|
|
}
|
|
else if (access_control == 7) {
|
|
trap_action = T_ABORT_4;
|
|
}
|
|
|
|
return { trap_action, access_control };
|
|
}
|
|
|
|
#if IS_POSIX
|
|
void mmu::add_par_pdr(json_t *const target, const int run_mode, const bool is_d, const std::string & name) const
|
|
{
|
|
json_t *j = json_object();
|
|
|
|
json_t *ja_par = json_array();
|
|
for(int i=0; i<8; i++)
|
|
json_array_append(ja_par, json_integer(pages[run_mode][is_d][i].par));
|
|
json_object_set(j, "par", ja_par);
|
|
|
|
json_t *ja_pdr = json_array();
|
|
for(int i=0; i<8; i++)
|
|
json_array_append(ja_pdr, json_integer(pages[run_mode][is_d][i].pdr));
|
|
json_object_set(j, "pdr", ja_pdr);
|
|
|
|
json_object_set(target, name.c_str(), j);
|
|
}
|
|
|
|
json_t *mmu::serialize() const
|
|
{
|
|
json_t *j = json_object();
|
|
|
|
for(int run_mode=0; run_mode<4; run_mode++) {
|
|
if (run_mode == 2)
|
|
continue;
|
|
|
|
for(int is_d=0; is_d<2; is_d++)
|
|
add_par_pdr(j, run_mode, is_d, format("runmode_%d_d_%d", run_mode, is_d));
|
|
}
|
|
|
|
json_object_set(j, "MMR0", json_integer(MMR0));
|
|
json_object_set(j, "MMR1", json_integer(MMR1));
|
|
json_object_set(j, "MMR2", json_integer(MMR2));
|
|
json_object_set(j, "MMR3", json_integer(MMR3));
|
|
json_object_set(j, "CPUERR", json_integer(CPUERR));
|
|
json_object_set(j, "PIR", json_integer(PIR));
|
|
json_object_set(j, "CSR", json_integer(CSR));
|
|
|
|
return j;
|
|
}
|
|
|
|
void mmu::set_par_pdr(const json_t *const j_in, const int run_mode, const bool is_d, const std::string & name)
|
|
{
|
|
json_t *j = json_object_get(j_in, name.c_str());
|
|
|
|
json_t *j_par = json_object_get(j, "par");
|
|
for(int i=0; i<8; i++)
|
|
pages[run_mode][is_d][i].par = json_integer_value(json_array_get(j_par, i));
|
|
json_t *j_pdr = json_object_get(j, "pdr");
|
|
for(int i=0; i<8; i++)
|
|
pages[run_mode][is_d][i].pdr = json_integer_value(json_array_get(j_pdr, i));
|
|
}
|
|
|
|
mmu *mmu::deserialize(const json_t *const j)
|
|
{
|
|
mmu *m = new mmu();
|
|
m->begin();
|
|
|
|
for(int run_mode=0; run_mode<4; run_mode++) {
|
|
if (run_mode == 2)
|
|
continue;
|
|
|
|
for(int is_d=0; is_d<2; is_d++)
|
|
m->set_par_pdr(j, run_mode, is_d, format("runmode_%d_d_%d", run_mode, is_d));
|
|
}
|
|
|
|
m->MMR0 = json_integer_value(json_object_get(j, "MMR0"));
|
|
m->MMR1 = json_integer_value(json_object_get(j, "MMR1"));
|
|
m->MMR2 = json_integer_value(json_object_get(j, "MMR2"));
|
|
m->MMR3 = json_integer_value(json_object_get(j, "MMR3"));
|
|
m->CPUERR = json_integer_value(json_object_get(j, "CPUERR"));
|
|
m->PIR = json_integer_value(json_object_get(j, "PIR"));
|
|
m->CSR = json_integer_value(json_object_get(j, "CSR"));
|
|
|
|
return m;
|
|
}
|
|
#endif
|