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feat/kernel: Added a physical page manager, has caching for single page alloc

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This commit is contained in:
Kevin Alavik 2025-05-14 15:39:33 +02:00
parent e2d6cfceea
commit 2bbc7dd70f
Signed by: cmpsb
GPG key ID: 10D1CC0526FDC6D7
8 changed files with 309 additions and 1 deletions
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37
kernel/src/emk.c
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@ -1,5 +1,6 @@
/* EMK 1.0 Copyright (c) 2025 Piraterna */
#include <boot/limine.h>
#include <boot/emk.h>
#include <arch/cpu.h>
#include <arch/io.h>
#include <dev/serial.h>
@ -7,11 +8,22 @@
#include <util/log.h>
#include <arch/gdt.h>
#include <arch/idt.h>
#include <sys/kpanic.h>
#include <mm/pmm.h>
__attribute__((used, section(".limine_requests"))) static volatile LIMINE_BASE_REVISION(3);
__attribute__((used, section(".limine_requests"))) static volatile struct limine_memmap_request memmap_request = {
.id = LIMINE_MEMMAP_REQUEST,
.revision = 0};
__attribute__((used, section(".limine_requests"))) static volatile struct limine_hhdm_request hhdm_request = {
.id = LIMINE_HHDM_REQUEST,
.revision = 0};
__attribute__((used, section(".limine_requests_start"))) static volatile LIMINE_REQUESTS_START_MARKER;
__attribute__((used, section(".limine_requests_end"))) static volatile LIMINE_REQUESTS_END_MARKER;
uint64_t hhdm_offset = 0;
struct limine_memmap_response *memmap = NULL;
void emk_entry(void)
{
if (serial_init(COM1) != 0)
@ -33,5 +45,30 @@ void emk_entry(void)
idt_init();
log_early("Initialized IDT");
if (!hhdm_request.response)
{
kpanic(NULL, "Failed to get HHDM request");
}
if (!memmap_request.response)
{
kpanic(NULL, "Failed to get memmap request");
}
memmap = memmap_request.response;
hhdm_offset = hhdm_request.response->offset;
log_early("HHDM Offset: %llx", hhdm_offset);
pmm_init();
log_early("Initialized PMM");
/* Test allocate a single physical page */
char *a = pmm_request_pages(1, true);
if (!a)
kpanic(NULL, "Failed to allocate single physical page");
*a = 32;
log_early("Allocated 1 physical page: %llx", (uint64_t)a);
pmm_release_pages(a, 1);
hlt();
}