first commit

1 files changed, 60 insertions, 0 deletions

diff --git a/src/kernel/include/paging.h b/src/kernel/include/paging.h
new file mode 100644
index 0000000..3b89af9
--- /dev/null
+++ b/src/kernel/include/paging.h
@@ -0,0 +1,60 @@
+#include <stdbool.h>
+//paging errors
+#define PAGEMAP_LOCATION 0x4000
+#ifndef _PAGE_H_
+#define _PAGE_H_ 
+#include <stdint.h>
+
+#define PAGE_VIRT_UNALIGNED 0x01 
+#define PAGE_PHYS_UNALIGNED 0x02
+#define PAGE_PHYS_INVALID   0x03
+#define PAGE_VIRT_INVALID   0x04
+
+//*
+typedef struct __attribute__((packed)) {
+  unsigned int present : 1;            // present, must be one when accessed.
+  unsigned int read_write : 1;         // if set to one, read and write is set
+  unsigned int user : 1;               // another bit we'll never use, for seperating CPL 0-2 and 3+
+  unsigned int writethrough_cache : 1; // honestly maybe I should look into caching
+  unsigned int cachable : 1;           // hardware chaching. 0 is enabled, whats the worst that could happen? 
+  unsigned int accessed : 1;           // we'll never use any of these!
+  unsigned int zg0 : 1;                // needs to be (and will be) zero'd
+  unsigned int size : 1;
+  unsigned int zg1 : 1;                // needs to be (and will be) zero'd
+  unsigned int software_marks : 3;     // available for our own use, I doubt we'll use it in such a simple thing
+  
+  uintptr_t base_ptr : 40;
+  unsigned int available:11;
+} page_entry;
+
+
+typedef struct __attribute__((packed)) {
+  page_entry pml4e[512];
+  page_entry pdpe[512];
+  page_entry pde[512];
+  page_entry pte[512];
+} page_table;
+
+#define MEM_AVAILABLE             0
+#define MEM_RESERVED              1
+#define MEM_APCI_RECLAIMABLE      2
+#define MEM_APCI_NVS              3
+#define MEM_BAD                   4
+
+#define PAGE_SIZE_4K              12
+#define PAGE_SIZE_2M              21
+#define PAGE_SIZE_1G              30
+
+struct memory_table {
+  uint64_t base;
+  uint64_t length;
+  uint32_t type;
+  uint32_t ACPI; //we'll never use this
+} __attribute__((packed));
+
+
+extern void* _meminfo_loc;
+
+bool map_page(uintptr_t virtual_addr, uintptr_t physical_addr, uint8_t PAGE_SIZE);
+void debug_print_memory();
+#endif