kernel: vm: Add physical memory allocator

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

2 files changed, 43 insertions, 0 deletions

diff --git a/sys/include/vm/physmem.h b/sys/include/vm/physmem.h
new file mode 100644
index 0000000..196a9a8
--- /dev/null
+++ b/sys/include/vm/physmem.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of Hyra nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _VM_PHYSMEM_H_
+#define _VM_PHYSMEM_H_
+
+#include <sys/types.h>
+
+void vm_physmem_init(void);
+uintptr_t vm_alloc_frame(size_t count);
+void vm_free_frame(uintptr_t base, size_t count);
+
+#endif  /* !_VM_PHYSMEM_H_ */
diff --git a/sys/include/vm/vm.h b/sys/include/vm/vm.h
index a4a073f..a2caa8c 100644
--- a/sys/include/vm/vm.h
+++ b/sys/include/vm/vm.h
@@ -39,4 +39,8 @@ extern volatile struct limine_hhdm_request g_hhdm_request;
 #define PHYS_TO_VIRT(phys) (void *)((uintptr_t)phys + VM_HIGHER_HALF)
 #define VIRT_TO_PHYS(virt) ((uintptr_t)virt - VM_HIGHER_HALF)
 
+#define DEFAULT_PAGESIZE 4096
+
+void vm_init(void);
+
 #endif