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Utility class for viewing/changing OF NVRAM variables.
This commit is contained in:
Maxim Poliakovski
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devices/common/ofnvram.cpp
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devices/common/ofnvram.cpp
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/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-22 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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/** @file Utilities for working with the Apple OpenFirmware NVRAM partition. */
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#include <devices/common/ofnvram.h>
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#include <endianswap.h>
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#include <loguru.hpp>
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#include <machines/machinebase.h>
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#include <memaccess.h>
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#include <cinttypes>
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#include <iomanip>
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#include <iostream>
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#include <map>
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#include <string>
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#include <tuple>
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using namespace std;
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void OfNvramUtils::init()
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{
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this->nvram_obj = dynamic_cast<NVram*>(gMachineObj->get_comp_by_name("NVRAM"));
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}
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bool OfNvramUtils::validate()
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{
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int i;
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OfNvramHdr hdr;
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if (this->nvram_obj == nullptr)
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return false;
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// read OF partition header
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for (i = 0; i < sizeof(OfNvramHdr); i++) {
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((uint8_t*)&hdr)[i] = this->nvram_obj->read_byte(OF_NVRAM_OFFSET + i);
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}
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// validate partition signature and version
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if (BYTESWAP_16(hdr.sig) != OF_NVRAM_SIG || hdr.version != 5)
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return false;
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this->size = hdr.num_pages * 256;
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if (this->size != 0x800)
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return false;
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// read the entire partition into the local buffer
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for (i = 0; i < this->size; i++) {
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this->buf[i] = this->nvram_obj->read_byte(OF_NVRAM_OFFSET + i);
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}
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// verify partition checksum
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if (this->checksum_partition() ^ 0xFFFFU)
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return false;
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return true;
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}
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uint16_t OfNvramUtils::checksum_partition()
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{
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uint32_t acc = 0;
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for (int i = 0; i < this->size; i += 2) {
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acc += READ_WORD_BE_A(&this->buf[i]);
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}
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return acc + (acc >> 16);
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}
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void OfNvramUtils::update_partition()
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{
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// set checksum in the header to zero
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this->buf[4] = 0;
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this->buf[5] = 0;
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// calculate new checksum
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uint16_t checksum = this->checksum_partition();
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checksum = checksum ? ~checksum : 0xFFFFU;
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// stuff it into the header
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WRITE_WORD_BE_A(&this->buf[4], checksum);
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// write the entire partition back to NVRAM
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for (int i = 0; i < this->size; i++) {
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this->nvram_obj->write_byte(OF_NVRAM_OFFSET + i, this->buf[i]);
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}
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}
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static const string flag_names[8] = {
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"little-endian?",
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"real-mode?",
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"auto-boot?",
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"diag-switch?",
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"fcode-debug?",
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"oem-banner?",
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"oem-logo?",
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"use-nvramrc?"
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};
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static const map<string, std::tuple<int, uint16_t>> of_vars = {
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// name, type, offset
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{"real-base", {1, 0x10}},
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{"real-size", {1, 0x14}},
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{"virt-base", {1, 0x18}},
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{"virt-size", {1, 0x1C}},
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{"load-base", {1, 0x20}},
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{"pci-probe-list", {1, 0x24}},
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{"screen-#columns", {1, 0x28}},
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{"screen-#rows", {1, 0x2C}},
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{"selftest-#megs", {1, 0x30}},
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{"boot-device", {2, 0x34}},
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{"boot-file", {2, 0x38}},
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{"diag-device", {2, 0x3C}},
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{"diag-file", {2, 0x40}},
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{"input-device", {2, 0x44}},
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{"output-device", {2, 0x48}},
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{"oem-banner", {2, 0x4C}},
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{"oem-logo", {2, 0x50}},
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{"nvramrc", {2, 0x54}},
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{"boot-command", {2, 0x58}},
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};
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void OfNvramUtils::printenv()
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{
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int i;
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if (!this->validate()) {
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cout << "Invalid OpenFirmware partition content!" << endl;
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return;
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}
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uint8_t of_flags = this->buf[12];
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cout << endl;
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// print flags
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for (i = 0; i < 8; i++) {
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cout << setw(20) << left << flag_names[i] <<
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(((of_flags << i) & 0x80) ? "true" : "false") << endl;
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}
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// print the remaining variables
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for (auto& var : of_vars) {
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auto type = std::get<0>(var.second);
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auto offset = std::get<1>(var.second);
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cout << setw(20) << left << var.first;
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switch (type) {
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case 1: // integer
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cout << hex << READ_DWORD_BE_A(&this->buf[offset]) << endl;
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break;
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case 2: // string
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uint16_t str_offset = READ_WORD_BE_A(&this->buf[offset]) - OF_NVRAM_OFFSET;
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uint16_t str_len = READ_WORD_BE_A(&this->buf[offset+2]);
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if (str_len) {
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char value[32] = "";
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std::memcpy(value, (char *)&(this->buf[str_offset]), str_len);
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cout << value;
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}
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cout << endl;
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}
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}
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cout << endl;
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}
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void OfNvramUtils::setenv(string var_name, string value)
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{
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int i, flag;
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if (!this->validate()) {
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cout << "Invalid OpenFirmware partition content!" << endl;
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return;
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}
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for (i = 0; i < 8; i++) {
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if (var_name == flag_names[i]) {
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if (value == "true")
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flag = 1;
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else if (value == "false")
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flag = 0;
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else {
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cout << "Invalid property value: " << value << endl;
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return;
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}
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uint8_t flag_bit = 0x80U >> i;
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uint8_t of_flags = this->buf[12];
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if (flag)
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of_flags |= flag_bit;
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else
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of_flags &= ~flag_bit;
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this->buf[12] = of_flags;
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this->update_partition();
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cout << " ok" << endl; // mimic Forth
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return;
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}
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}
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cout << "Changing of properties not supported yet" << endl;
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}
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61
devices/common/ofnvram.h
Normal file
61
devices/common/ofnvram.h
Normal file
@ -0,0 +1,61 @@
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/*
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DingusPPC - The Experimental PowerPC Macintosh emulator
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Copyright (C) 2018-22 divingkatae and maximum
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(theweirdo) spatium
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(Contact divingkatae#1017 or powermax#2286 on Discord for more info)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef OF_NVRAM_H
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#define OF_NVRAM_H
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#include <devices/common/nvram.h>
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/** @file Utilities for working with the Apple OpenFirmware NVRAM partition. */
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#define OF_NVRAM_OFFSET 0x1800
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#define OF_NVRAM_SIG 0x1275
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typedef struct {
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uint16_t sig; // partition signature (= 0x1275)
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uint8_t version; // header version
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uint8_t num_pages; // number of memory pages
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uint16_t checksum; // partition checksum
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uint16_t here; // offset to the next free byte (bottom-up)
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uint16_t top; // offset to the last free byte (top-down)
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} OfNvramHdr;
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class OfNvramUtils {
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public:
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OfNvramUtils() = default;
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~OfNvramUtils() = default;
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void init();
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void printenv();
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void setenv(std::string var_name, std::string value);
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protected:
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bool validate();
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uint16_t checksum_partition();
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void update_partition();
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private:
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NVram* nvram_obj = nullptr;
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int size = 0;
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uint8_t buf[0x800];
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};
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#endif // OF_NVRAM_H
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