kern: proc: Keep track of mapped areas with ranges

This commit adds a virtual memory range queue to the process descriptor
in order to keep track of mapped pages and free their respective frames
upon program exit.

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 16 insertions, 0 deletions

diff --git a/src/sys/include/vm/vm.h b/src/sys/include/vm/vm.h
index 790fe0b..f5f7b16 100644
--- a/src/sys/include/vm/vm.h
+++ b/src/sys/include/vm/vm.h
@@ -31,6 +31,7 @@
 #define _VM_H_ 1
 
 #include <sys/types.h>
+#include <sys/queue.h>
 #include <sys/bootvars.h>
 
 #define VM_HIGHER_HALF (get_kernel_base())
@@ -42,6 +43,21 @@
 typedef uintptr_t vaddr_t;
 typedef uintptr_t paddr_t;
 
+/*
+ * Describes a virtual memory range
+ *
+ * @pa_base: Physical memory base
+ * @va_base: Virtual memory base
+ * @len: Length of region
+ * @link: Queue link
+ */
+struct vm_range {
+    paddr_t pa_base;
+    vaddr_t va_base;
+    size_t len;
+    TAILQ_ENTRY(vm_range) link;
+};
+
 void vm_init(void);
 
 #endif  /* !_VM_H_ */