kernel: vm: Add pageframe allocation

This commit introduces pageframe allocation logic to the
Vega virtual memory subsystem.

Signed-off-by: sigsegv7 <ian@vegaa.systems>

2 files changed, 19 insertions, 0 deletions

diff --git a/sys/include/vm/vm.h b/sys/include/vm/vm.h
index 78038f0..baf7677 100644
--- a/sys/include/vm/vm.h
+++ b/sys/include/vm/vm.h
@@ -32,6 +32,8 @@
 
 #include <sys/types.h>
 #include <sys/limine.h>
+#include <sys/cdefs.h>
+#include <vm/vm_page.h>
 
 extern volatile struct limine_hhdm_request g_hhdm_request;
 
@@ -40,6 +42,19 @@ extern volatile struct limine_hhdm_request g_hhdm_request;
 #define PHYS_TO_VIRT(phys) (void *)((uintptr_t)phys + VM_HIGHER_HALF)
 #define VIRT_TO_PHYS(virt) ((uintptr_t)virt - VM_HIGHER_HALF)
 
+/*
+ * Returns the machine's pagesize:
+ *
+ * XXX TODO: This needs to be moved to vmm_init.c
+ *           while returning a non-constant value.
+ */
+static inline size_t
+vm_get_page_size(void)
+{
+    return 4096;
+}
+
 void vm_init(void);
+struct vas vm_new_vas(void);
 
 #endif      /* !_VM_H_ */
diff --git a/sys/include/vm/vm_physseg.h b/sys/include/vm/vm_physseg.h
index 5bf21db..5865a84 100644
--- a/sys/include/vm/vm_physseg.h
+++ b/sys/include/vm/vm_physseg.h
@@ -30,6 +30,10 @@
 #ifndef _VM_VM_PHYSSEG_H_
 #define _VM_VM_PHYSSEG_H_
 
+#include <sys/types.h>
+
 void vm_physseg_init(void);
+uintptr_t vm_alloc_pageframe(size_t count);
+void vm_free_pageframe(uintptr_t base, size_t count);
 
 #endif      /* !_VM_VM_PHYSSEG_H_ */