56 lines
3.1 KiB
PHP
Executable File
56 lines
3.1 KiB
PHP
Executable File
; Copyright (c) 2024 Elaina Claus
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;
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; Permission is hereby granted, free of charge, to any person obtaining a copy
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; of this software and associated documentation files (the "Software"), to deal
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; in the Software without restriction, including without limitation the rights
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; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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; copies of the Software, and to permit persons to whom the Software is
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; furnished to do so, subject to the following conditions:
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;
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; The above copyright notice and this permission notice shall be included in all
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; copies or substantial portions of the Software.
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;
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; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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; SOFTWARE.
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%ifndef __INC_EARLY_MEM
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; ## Generic Low mem map (from osdev wiki) ##
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; start end size type description
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; Low Memory (the first MiB)
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; 0x00000000 0x000003FF 1 KiB RAM - partially unusable Real Mode IVT (Interrupt Vector Table)
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; 0x00000400 0x000004FF 256 bytes RAM - partially unusable BDA (BIOS data area)
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; 0x00000500 0x00007BFF almost 30 KiB RAM - free for use Conventional memory
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; 0x00007C00 0x00007DFF 512 bytes RAM - partially unusable OS BootSector
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; 0x00007E00 0x0007FFFF 480.5 KiB RAM - free for use Conventional memory
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; 0x00080000 0x0009FFFF 128 KiB RAM - partially unusable EBDA (Extended BIOS Data Area)
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; 0x000A0000 0x000FFFFF 384 KiB various (unusable) Video memory, ROM Area
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; ## A rough overview of high mem ##
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; Idealy this needs to be probed with the E820 functions
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; # Start # End # size # description
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;
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; 0x00100000 0x00EFFFFF 0x00E00000 (14 MiB) RAM -- free for use (if it exists) Extended memory
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; 0x00F00000 0x00FFFFFF 0x00100000 (1 MiB) Possible memory mapped hardware ISA Memory Hole 15-16MB
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; 0x01000000 ???????? ??? (whatever exists) RAM -- free for use More Extended memory
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; 0xC0000000 (sometimes) 0xFFFFFFFF 0x40000000 (1 GiB) Memory mapped PCI devices, PnP NVRAM?, IO APIC/s, local APIC/s, BIOS, ...
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; 0x0000000100000000 ??? ??? (whatever exists) RAM -- free for use (PAE/64bit)/More Extended memory
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; ???????????????? ??? ??? Potentially usable for memory mapped PCI devices in modern hardware (but typically not, due to backward compatibility)
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;PhysicalAddress = Segment * 16 + Offset
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%define SEG_TO_LINEAR(s,o) ((s << 4) + o)
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; Offset = physical / (Segment * 16)
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%define LINEAR_TO_OFFSET(p,s) ((p / (s << 4)))
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; Seg = (physical - offset) / 16
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%define LINEAR_TO_SEGMENT(p,o) ((p - o) >> 4)
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%endif
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%define __INC_EARLY_MEM |