Meta: Move kernel and userland to their own folders.

This is to allow both the kernel and the userland to share certain
header files and to make the folder structure a bit more clear.

1 files changed, 40 insertions, 0 deletions

diff --git a/kernel/ksbrk.c b/kernel/ksbrk.c
new file mode 100644
index 0000000..755a4ed
--- /dev/null
+++ b/kernel/ksbrk.c
@@ -0,0 +1,40 @@
+#include <assert.h>
+#include <ksbrk.h>
+#include <mmu.h>
+#include <stddef.h>
+#include <stdint.h>
+
+/*
+extern uintptr_t data_end;
+extern PageDirectory *kernel_directory;
+
+#define HEAP 0x00E00000
+#define PHYS 0x403000
+#define PAGE_SIZE ((uintptr_t)0x1000)
+void *ksbrk(size_t s) {
+  uintptr_t rc = (uintptr_t)align_page((void *)data_end);
+  data_end += s;
+  data_end = (uintptr_t)align_page((void *)data_end);
+
+  if (!get_active_pagedirectory()) {
+    // If there is no active pagedirectory we
+    // just assume that the memory is
+    // already mapped.
+    return (void *)rc;
+  }
+  mmu_allocate_shared_kernel_region((void *)rc, (data_end - (uintptr_t)rc));
+  assert(((uintptr_t)rc % PAGE_SIZE) == 0);
+  memset((void *)rc, 0xFF, s);
+  return (void *)rc;
+}
+
+void *ksbrk_physical(size_t s, void **physical) {
+  void *r = ksbrk(s);
+  if (physical) {
+    //    if (0 == get_active_pagedirectory())
+    //      *physical = (void *)((uintptr_t)r - (0xC0000000 + PHYS) + HEAP);
+    //    else
+    *physical = (void *)virtual_to_physical(r, 0);
+  }
+  return r;
+}*/