Switched the physical memory allocator to a bitmap table. Previously,

page allocations were recorded by marking entries in the dummy page
tables 'flow' and 'fupp'. This approach was not very memory efficient,
since 4-bytes were used to record each page.

Now, a bitmap table is used, where every bit represents a page (every
byte therefore representing 8 pages). This approach also shaves some CPU
time during allocation, since 8 pages can be checked at a time by
testing whole bytes.

1 files changed, 2 insertions, 0 deletions

diff --git a/include/kernel/memory.h b/include/kernel/memory.h
index 7217427..97073b3 100644
--- a/include/kernel/memory.h
+++ b/include/kernel/memory.h
@@ -1,5 +1,7 @@
 #include <stdint.h>
 
+#define NPAGES 2048
+
 #define PGENT 1024
 
 typedef uint32_t pte_t;