68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/*
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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 Open Firmware NVRAM partition. */
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#define OF_NVRAM_OFFSET 0x1800
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#define OF_NVRAM_SIG 0x1275
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// OF Variable types
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enum {
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OF_VAR_TYPE_INT = 1,
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OF_VAR_TYPE_STR = 2,
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};
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typedef struct {
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uint16_t sig; // >nv.1275 partition signature (= 0x1275)
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uint8_t version; // >nv.version header version (= 5)
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uint8_t num_pages; // >nv.pages number of memory pages (= 8 pages 0x100 bytes each)
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uint16_t checksum; // >nv.checksum partition checksum
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uint16_t here; // >nv.here offset to the next free byte (offset of after last string length; = 0x185c)
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uint16_t top; // >nv.top offset to the last free byte (offset of string with lowest offset; < 0x2000)
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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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int 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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