Chloe M.
100 lines
2.2 KiB
C
100 lines
2.2 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 <ex/trace.h>
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#include <ke/bpal.h>
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#include <mm/pmm.h>
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#include <units.h>
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#define DTRACE(Fmt, ...) \
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TRACE("[ PMM ]: " Fmt, ##__VA_ARGS__)
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/* Use to convert type constants to strings */
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#define MEM_TYPE(TYPE) \
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((TYPE) < NELEM(TypeTab)) \
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? TypeTab[(TYPE)] \
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: "invalid"
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/*
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* Memory type constant to human readable
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* string table.
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*/
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static const char *TypeTab[] = {
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[MEMORY_USABLE] = "usable",
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[MEMORY_RESERVED] = "reserved",
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[MEMORY_ACPI_RECLAIM] = "acpi reclaimable",
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[MEMORY_ACPI_NVS] = "acpi nvs",
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[MEMORY_BAD] = "bad*",
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[MEMORY_BOOTLOADER] = "bootloader",
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[MEMORY_KERNEL] = "stoskrnl.sys",
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[MEMORY_FRAMEBUFFER] = "framebuffer",
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[MEMORY_ACPI_TABLES] = "acpi tables"
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};
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/* Globals */
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static USIZE UsableMemory = 0;
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/*
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* Print the units of a size in a pretty format
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*
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* @Length: Number of bytes
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* @Title: Title of units
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*/
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static inline VOID
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MmPrintUnits(USIZE Length, const CHAR *Title)
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{
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if (Title == NULL) {
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return;
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}
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if (Length >= UNIT_GIB) {
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DTRACE("%d gib %s\n", Length / UNIT_GIB, Title);
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} else if (Length >= UNIT_MIB) {
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DTRACE("%d mib %s\n", Length / UNIT_MIB, Title);
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} else {
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DTRACE("%010d b %s\n", Length, Title);
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}
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}
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static VOID
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MmProbeMemory(VOID)
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{
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BPAL_HANDLE BpalHandle;
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MEMMAP_ENTRY Entry;
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UPTR EntryEnd;
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USIZE Idx;
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ST_STATUS Status;
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KeBpalGetHandle(&BpalHandle);
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for (Idx = 0;; ++Idx) {
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Status = BpalHandle.MemEntryIdx(Idx, &Entry);
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if (Status != STATUS_SUCCESS) {
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break;
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}
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EntryEnd = Entry.Base + Entry.Length;
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DTRACE("[%p - %p) ~ %s\n", Entry.Base, EntryEnd, MEM_TYPE(Entry.Type));
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/* Only usable entries from this point on */
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if (Entry.Type != MEMORY_USABLE) {
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continue;
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}
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UsableMemory += Entry.Length;
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}
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MmPrintUnits(UsableMemory, "avl");
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}
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VOID
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MmInitPmm(VOID)
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{
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DTRACE("sniffing out installed ram...\n");
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MmProbeMemory();
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}
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