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mpc106: Fix RAM allocation.

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Fix bank_end calculation (left shift 28 instead of 30).
Handle unorderred and discontinous ranges.
This commit is contained in:
joevt 2023-09-18 17:09:19 -07:00 committed by dingusdev
parent 6931b2944b
commit f541613c6b
1 changed files with 42 additions and 23 deletions
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65
devices/memctrl/mpc106.cpp
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@ -294,35 +294,54 @@ void MPC106::pci_cfg_write(uint32_t reg_offs, uint32_t value, AccessDetails &det
}
void MPC106::setup_ram() {
uint32_t mem_start, mem_end, ext_mem_start, ext_mem_end, bank_start, bank_end;
uint32_t ram_size = 0;
uint32_t bank_start[8];
uint32_t bank_end[8];
int bank_order[8];
int bank_count = 0;
int region_count = 0;
// get non-empty banks
for (int bank = 0; bank < 8; bank++) {
if (this->mem_bank_en & (1 << bank)) {
if (bank < 4) {
mem_start = this->mem_start[0];
ext_mem_start = this->ext_mem_start[0];
mem_end = this->mem_end[0];
ext_mem_end = this->ext_mem_end[0];
} else {
mem_start = this->mem_start[1];
ext_mem_start = this->ext_mem_start[1];
mem_end = this->mem_end[1];
ext_mem_end = this->ext_mem_end[1];
}
bank_start = (((ext_mem_start >> bank * 8) & 3) << 30) |
(((mem_start >> bank * 8) & 0xFF) << 20);
bank_end = (((ext_mem_end >> bank * 8) & 3) << 30) |
(((mem_end >> bank * 8) & 0xFF) << 20) | 0xFFFFFUL;
if (bank && bank_start != ram_size)
LOG_F(WARNING, "Grackle: RAM not contiguous!");
ram_size += bank_end - bank_start + 1;
int b = (bank >= 4);
bank_start[bank_count] = (((ext_mem_start[b] >> bank * 8) & 3) << 28) |
(((mem_start[b] >> bank * 8) & 0xFF) << 20);
bank_end[bank_count] = (((ext_mem_end[b] >> bank * 8) & 3) << 28) |
(((mem_end[b] >> bank * 8) & 0xFF) << 20) | 0xFFFFFUL;
bank_order[bank_count] = bank_count;
bank_count++;
}
}
if (!this->add_ram_region(0, ram_size)) {
LOG_F(WARNING, "Grackle: RAM allocation 0x%X..0x%X failed (maybe already exists?)",
0, ram_size - 1);
// sort banks by start address
for (int i = 0; i < bank_count; i++) {
for (int j = i + 1; j < bank_count; j++) {
if (bank_start[bank_order[j]] < bank_start[bank_order[i]]) {
int temp = bank_order[i];
bank_order[i] = bank_order[j];
bank_order[j] = temp;
}
}
}
// squash adjacent banks into memory regions
for (int i = 0; i < bank_count; i++) {
if (region_count > 0 && bank_start[bank_order[i]] == bank_end[bank_order[region_count - 1]] + 1)
bank_end[bank_order[region_count - 1]] = bank_end[bank_order[i]];
else {
bank_order[region_count] = bank_order[i];
region_count++;
}
}
// allocate memory regions
for (int i = 0; i < region_count; i++) {
uint32_t region_size = bank_end[bank_order[i]] - bank_start[bank_order[i]] + 1;
if (!this->add_ram_region(bank_start[bank_order[i]], region_size)) {
LOG_F(WARNING, "Grackle: %d MB RAM allocation 0x%X..0x%X failed (maybe already exists?)",
region_size / (1024 * 1024), bank_start[bank_order[i]], bank_end[bank_order[i]]
);
}
}
}