PROJECT RESTRUCTURING

Move the entire kernel into its own directory. Create new directories
for system commands, libraries and other required essentials for a
complete Unix-like operating system.

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

1 files changed, 21 insertions, 0 deletions

diff --git a/arch/i386/kernel/pmem.c b/kernel/arch/x86/kernel/pmem.c
index 40e3400..edf71d9 100644
--- a/arch/i386/kernel/pmem.c
+++ b/kernel/arch/x86/kernel/pmem.c
@@ -6,6 +6,7 @@
 #include <libk/io.h>
 #include <libk/string.h>
 
+static uintptr_t bitmap[5];
 static struct pfa_page freelist;
 
 void pfa_init(struct mboot_info *header) {
@@ -17,6 +18,9 @@ void pfa_init(struct mboot_info *header) {
         }
 }
 
+uintptr_t pfa_alloc_dma(size_t num_pages) {
+}
+
 uintptr_t pfa_alloc(size_t num_pages) {
         struct pfa_page *temp = (struct pfa_page*)PAGE_TMP_MAP;
         map_page(freelist.next, PAGE_TMP_MAP, PD_PRES | PD_RW);
@@ -27,6 +31,23 @@ uintptr_t pfa_alloc(size_t num_pages) {
         return ret;
 }
 
+void pfa_free_dma(uintptr_t paddr, size_t num_pages) {
+        if (paddr % PAGE_SIZE != 0)
+                panic("Task attempted to free non-aligned memory");
+        if (paddr >= KSTART && paddr < KEND)
+                return;
+        if (paddr >= 0x00080000 && paddr < 0x00100000)
+                return;
+
+        int index = 0;
+        int bit = 0;
+        for (uintptr_t i = paddr; i < paddr + (num_pages * PAGE_SIZE); i += PAGE_SIZE) {
+                index = i / PAGE_SIZE / 32;
+                bit = i / PAGE_SIZE % 32;
+                bitmap[index] |= 1 << bit;
+        }
+}
+
 void pfa_free(uintptr_t paddr, size_t num_pages) {
         uintptr_t addr;
         struct pfa_page *temp = (struct pfa_page*)PAGE_TMP_MAP;