82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
/*
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* Copyright (c) 2026, Chloe M.
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* Provided under the BSD-3 clause.
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*
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* Description: Physical memory management
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* Author: Chloe M.
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*/
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#include <mm/pm.h>
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#include <ke/bpal.h>
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#include <ex/trace.h>
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#define DTRACE(Fmt, ...) \
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TRACE("[ PM ]: " Fmt, ##__VA_ARGS__)
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/* Safe macro to get region string */
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#define PM_REGION(TYPE) \
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((TYPE) >= NELEM(PmRegionTable)) \
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? "bad type" \
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: PmRegionTable[(TYPE)]
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/*
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* Table of known memory regions
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*/
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static const CHAR *PmRegionTable[] = {
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[MEMORY_USABLE] = "available",
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[MEMORY_RESERVED] = "reserved",
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[MEMORY_ACPI_RECLAIM] = "acpi reclaimable",
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[MEMORY_ACPI_NVS] = "acpi nv-sleep",
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[MEMORY_BAD] = "bad",
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[MEMORY_BOOTLOADER] = "bootloader",
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[MEMORY_KERNEL] = "system",
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[MEMORY_FRAMEBUFFER] = "vram",
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[MEMORY_ACPI_TABLES] = "acpi tables"
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};
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/*
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* Probe physical memory for usable regions and list
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* installed memory.
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*/
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static VOID
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PmProbe(VOID)
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{
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PT_STATUS Status;
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BPAL_HANDLE BpalHandle;
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MEMMAP_ENTRY Entry;
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UPTR Start, End;
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USIZE Index;
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/*
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* We obtain memory map entries from the BPAL layer as it is provided
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* by the bootloader which got it from firmware.
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*/
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KeBpalGetHandle(&BpalHandle);
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/* Iterate each memory entry */
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for (Index = 0;; ++Index) {
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Status = BpalHandle.MemEntryIdx(Index, &Entry);
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/* Are we out of entries to fetch? */
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if (PT_ERROR(Status)) {
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break;
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}
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Start = Entry.Base;
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End = Start + Entry.Length;
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DTRACE(
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"%p - %p : %s\n",
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Start,
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End,
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PM_REGION(Entry.Type)
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);
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}
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}
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VOID
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MmPmInit(VOID)
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{
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DTRACE("probing physical memory...\n");
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PmProbe();
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}
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