From f004c1ade8d617a82cea2fe249434cccb47a2358 Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Tue, 19 Mar 2024 13:03:52 -0400
Subject: rename abi to sys. better memory allocation

---
 mem/memory.h | 72 ++++++++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 53 insertions(+), 19 deletions(-)

(limited to 'mem/memory.h')

diff --git a/mem/memory.h b/mem/memory.h
index 41323ed..251c6f5 100644
--- a/mem/memory.h
+++ b/mem/memory.h
@@ -1,36 +1,61 @@
 #ifndef JOVE_MEM_H
 #define JOVE_MEM_H 1
 
-#define PAGESIZE 4096ULL
+#define PAGE_SHIFT 12
+#define PAGE_SIZE (1 << PAGE_SHIFT)
+#define PAGE_MASK (PAGE_SIZE - 1)
+
 #define KiB 1024ULL
 #define MiB (KiB * KiB)
 #define GiB (MiB * KiB)
 #define TiB (GiB * KiB)
 
-#include <stddef.h>
-#include <stdint.h>
-#include <stdbool.h>
-typedef uintptr_t physptr_t;
+#include "lib/spinlock.h"
+#include "sys/types.h"
+
+typedef struct page_directory
+{
+    spinlock_t lock;
+    size_t id;
+    size_t ref;
+    physptr_t phys;
+    void *virt;
+} page_directory_t;
 
 #include "slab.h"
 
-/*Linear*/
-void mem_paging_setup(void);
+extern page_directory_t *current_page_directory;
 
-physptr_t mem_linear_tophys(uintptr_t virt);
+/**Setup the kernel structures responsible for handling physical memory translation.*/
+void mem_paging_setup(void);
 
-/**Check if pointer is within valid memory.
+/**Check if a given pointer is valid.
  * @param ptr pointer to check.
- * @return if the pointer is invalid.*/
+ * @return if the pointer is valid.*/
 bool mem_check_ptr(const void *ptr);
 
-/**Make sure the range indicated is available in memory.
- * If necessary, allocate new pages using the passed flags
- * @param from start of the range.
- * @param to end of the range.
- * @param rw flag to mark page is writeable.
- * @param user flag to mark page as user accessable*/
-void mem_ensure_range(uintptr_t from, uintptr_t to, bool rw, bool user);
+/** Return the physical memory mapping for the given address.
+ * @param pd page directory to get mapping in.
+ * @param addr address to get mapping for.
+ * @return HAL compliant page mapping.*/
+page_mapping_t mem_get_mapping_as(page_directory_t *pd, uintptr_t addr);
+
+/** Return the physical memory mapping for the given address.
+ * @param addr address to get mapping for.
+ * @return HAL compliant page mapping.*/
+page_mapping_t mem_get_mapping(uintptr_t addr);
+
+/** Map a page mapping to a given virtual address.
+ * @param pd pointer to the page directory to edit.
+ * @param mapping mapping to apply.
+ * @param virt virtual address to map to. */
+void mem_set_mapping_as(page_directory_t *pd, page_mapping_t mapping, uintptr_t virt);
+
+/** Map a page mapping to a given virtual address.
+ * @param pd pointer to the page directory to edit.
+ * @param mapping mapping to apply.
+ * @param virt virtual address to map to. */
+void mem_set_mapping(page_mapping_t mapping, uintptr_t virt);
 
 /** Make sure the range indicated is available in memory for specified pd
  * If necessary, allocate new pages using the passed flags
@@ -39,7 +64,15 @@ void mem_ensure_range(uintptr_t from, uintptr_t to, bool rw, bool user);
  * @param to end of the range
  * @param rw flag to mark page is writeable
  * @param user flag to mark page as user accessable*/
-void mem_ensure_range_for(void *pd, uintptr_t from, uintptr_t to, bool rw, bool user);
+void mem_ensure_range_as(page_directory_t *pd, uintptr_t from, uintptr_t to, page_flags_t flg);
+
+/**Make sure the range indicated is available in memory
+ * If necessary, allocate new pages using the passed flags
+ * @param from start of the range.
+ * @param to end of the range.
+ * @param rw flag to mark page is writeable.
+ * @param user flag to mark page as user accessable*/
+void mem_ensure_range(uintptr_t from, uintptr_t to, page_flags_t flg);
 
 void mem_slab_setup(void);
 void mem_slabcache_new(struct SlabCache *cache, char *name, size_t objsize);
@@ -53,7 +86,8 @@ void mem_free(void *ptr);
 /*Physical*/
 
 physptr_t mem_phys_alloc(size_t pages);
-void mem_phys_reserve(physptr_t start, size_t len);
+void mem_phys_reserve(physptr_t start, physptr_t end);
+void mem_phys_release(physptr_t start, physptr_t end);
 
 void mem_setup(void);
 
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