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platinum: Add RAM.

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This commit is contained in:
joevt
2024-02-21 05:43:12 -08:00
committed by dingusdev
parent 71990129f3
commit 86a09a9d3c
2 changed files with 49 additions and 4 deletions
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51
devices/memctrl/platinum.cpp
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@@ -242,6 +242,7 @@ void PlatinumCtrl::write(uint32_t rgn_start, uint32_t offset, uint32_t value, in
case PlatinumReg::BANK_6_BASE:
case PlatinumReg::BANK_7_BASE:
this->bank_base[(offset >> 4) - PlatinumReg::BANK_0_BASE] = value;
this->map_phys_ram();
break;
case PlatinumReg::FB_BASE_ADDR:
this->fb_addr = value;
@@ -406,12 +407,54 @@ void PlatinumCtrl::map_phys_ram() {
total_ram += this->bank_size[i];
}
if (total_ram > DRAM_CAP_64MB) {
ABORT_F("%s: RAM bigger than 64MB not supported yet", this->name.c_str());
if (!this->dram_ptr) {
this->dram_ptr = std::unique_ptr<uint8_t[]> (new uint8_t[total_ram]()); /* () intializer clears the memory to zero */
if (!this->dram_ptr) {
ABORT_F("%s: could not allocate RAM storage", this->name.c_str());
}
}
if (!add_ram_region(0x00000000, total_ram)) {
ABORT_F("%s: could not allocate RAM storage", this->name.c_str());
ram_map.erase(std::remove_if(ram_map.begin(), ram_map.end(),
[this](AddressMapEntry *entry) {
delete this->remove_region(entry);
return true;
}
), ram_map.end());
uint32_t ram_offset = 0;
uint32_t ram_end = 0;
while (1) {
// find first bank that exists after the last added region
uint32_t ram_start = -1;
for (int bank = 0; bank < 8; bank++) {
if (
this->bank_size[bank] && // has size
this->bank_base[bank] >= ram_end && // starts after the last ending
this->bank_base[bank] < ram_start // has earlier start
) {
ram_start = this->bank_base[bank];
}
}
if (ram_start + 1 == 0)
break;
ram_end = ram_start;
// find the max size of this region
for (int bank = 0; bank < 8; bank++) {
if (
this->bank_size[bank] && // has size
this->bank_base[bank] <= ram_end && // starts before the end
this->bank_base[bank] + this->bank_size[bank] > ram_end // ends after the end
) {
ram_end = this->bank_base[bank] + this->bank_size[bank];
}
}
AddressMapEntry *entry = this->add_ram_region(ram_start, ram_end - ram_start, &dram_ptr[ram_offset]);
if (entry) {
ram_map.push_back(entry);
} else {
ABORT_F("%s: could not allocate RAM storage", this->name.c_str());
}
ram_offset += ram_end - ram_start;
}
}

2
devices/memctrl/platinum.h
View File

@@ -368,6 +368,8 @@ private:
std::unique_ptr<uint8_t[]> vram_ptr = nullptr;
std::unique_ptr<DisplayID> display_id = nullptr;
std::unique_ptr<AppleRamdac> dacula = nullptr;
std::unique_ptr<uint8_t[]> dram_ptr = nullptr;
std::vector<AddressMapEntry*> ram_map;
};
#endif // PLATINUM_MEMCTRL_H