PMM and liballoc port

kernel/limine/.gitignore

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+*.o

kernel/limine/requests.c

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+#include <limine/limine.h>
+
+#define DECL_REQ(small, big) \
+  __attribute__((used, section(".limine_requests"))) \
+  struct limine_ ## small ## _request limine_ ## small ## _request = { \
+    .id = LIMINE_ ## big ## _REQUEST_ID, \
+    .revision = 4 \
+  }
+
+__attribute__((used, section(".limine_requests")))
+volatile uint64_t limine_base_revision[] = LIMINE_BASE_REVISION(4);
+
+__attribute__((used, section(".limine_requests_start")))
+volatile uint64_t limine_requests_start_marker[] = LIMINE_REQUESTS_START_MARKER;
+
+__attribute__((used, section(".limine_requests_end")))
+volatile uint64_t limine_requests_end_marker[] = LIMINE_REQUESTS_END_MARKER;
+
+DECL_REQ(hhdm, HHDM);
+DECL_REQ(memmap, MEMMAP);

kernel/limine/requests.h

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+#ifndef _KERNEL_LIMINE_REQUESTS_H
+#define _KERNEL_LIMINE_REQUESTS_H
+
+#include <limine/limine.h>
+
+#define EXTERN_REQ(small) \
+  extern struct limine_ ## small ## _request limine_ ## small ## _request
+
+EXTERN_REQ(hhdm);
+EXTERN_REQ(memmap);
+
+#endif // _KERNEL_LIMINE_REQUESTS_H

kernel/limine/src.mk

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+c += limine/requests.c
+
+o += limine/requests.o