arch: i386: kernel: add mostly finished PFA and paging system

Add the mostly finished physical memory allocator and expose its
functions to the paging system.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/i386/include/kernel/paging.h b/arch/i386/include/kernel/paging.h
index 7f820e8..e949e32 100644
--- a/arch/i386/include/kernel/paging.h
+++ b/arch/i386/include/kernel/paging.h
@@ -23,9 +23,10 @@
 #define ERR_RESERVED    0x8
 #define ERR_INST        0x10
 
-#define PAGE_SIZE       4096
+#define PGROUNDUP(size) (((size)+PAGE_SIZE-1) & ~(PAGE_SIZE-1))
+#define PGROUNDDN(size) (((size)) & ~(PAGE_SIZE-1))
 
-uint32_t* init_page_table(uint32_t flags);
+int init_page_directory(uintptr_t *pd, int user);
 void enable_paging(uintptr_t pd_addr);
 
 void paging_init(void);