xnu-3789.1.32.tar.gz

[apple/xnu.git] / osfmk / vm / vm_shared_region.h

diff --git a/osfmk/vm/vm_shared_region.h b/osfmk/vm/vm_shared_region.h
index 9cc2b394ca0ceaaab4927e3faf4139b710cec6f5..87097ee39a4be02f2fab6ceeea38e899104d3ff6 100644 (file)
--- a/osfmk/vm/vm_shared_region.h
+++ b/osfmk/vm/vm_shared_region.h
@@ -92,13 +92,20 @@ typedef struct vm_shared_region *vm_shared_region_t;
 #include <vm/vm_object.h>
 #include <vm/memory_object.h>
 
-typedef struct vm_shared_region_slide_info_entry       *vm_shared_region_slide_info_entry_t;
-struct vm_shared_region_slide_info_entry {
+#define PAGE_SIZE_FOR_SR_SLIDE 4096
+
+/* Documentation for the slide info format can be found in the dyld project in
+ * the file 'launch-cache/dyld_cache_format.h'. */
+
+typedef struct vm_shared_region_slide_info_entry_v1 *vm_shared_region_slide_info_entry_v1_t;
+struct vm_shared_region_slide_info_entry_v1 {
        uint32_t        version;
        uint32_t        toc_offset;     // offset from start of header to table-of-contents
        uint32_t        toc_count;      // number of entries in toc (same as number of pages in r/w mapping)
        uint32_t        entry_offset;
        uint32_t        entry_count;
+       // uint16_t     toc[toc_count];
+       // entrybitmap  entries[entries_count];
 };
 
 #define NBBY   8
@@ -108,6 +115,34 @@ struct slide_info_entry_toc {
        uint8_t entry[NUM_SLIDING_BITMAPS_PER_PAGE];
 };
 
+typedef struct vm_shared_region_slide_info_entry_v2 *vm_shared_region_slide_info_entry_v2_t;
+struct vm_shared_region_slide_info_entry_v2 {
+       uint32_t        version;
+       uint32_t        page_size;
+       uint32_t        page_starts_offset;
+       uint32_t        page_starts_count;
+       uint32_t        page_extras_offset;
+       uint32_t        page_extras_count;
+       uint64_t        delta_mask;             // which (contiguous) set of bits contains the delta to the next rebase location
+       uint64_t        value_add;
+       // uint16_t     page_starts[page_starts_count];
+       // uint16_t     page_extras[page_extras_count];
+};
+
+#define DYLD_CACHE_SLIDE_PAGE_ATTRS            0xC000  // high bits of uint16_t are flags
+#define DYLD_CACHE_SLIDE_PAGE_ATTR_EXTRA       0x8000  // index is into extras array (not starts array)
+#define DYLD_CACHE_SLIDE_PAGE_ATTR_NO_REBASE   0x4000  // page has no rebasing
+#define DYLD_CACHE_SLIDE_PAGE_ATTR_END         0x8000  // last chain entry for page
+#define DYLD_CACHE_SLIDE_PAGE_VALUE            0x3FFF  // bitwise negation of DYLD_CACHE_SLIDE_PAGE_ATTRS
+#define DYLD_CACHE_SLIDE_PAGE_OFFSET_SHIFT     2
+
+typedef union vm_shared_region_slide_info_entry *vm_shared_region_slide_info_entry_t;
+union vm_shared_region_slide_info_entry {
+       uint32_t        version;
+       struct vm_shared_region_slide_info_entry_v1     v1;
+       struct vm_shared_region_slide_info_entry_v2     v2;
+};
+
 typedef struct vm_shared_region_slide_info *vm_shared_region_slide_info_t;
 struct vm_shared_region_slide_info {
        mach_vm_offset_t        start;
@@ -156,6 +191,7 @@ extern void vm_shared_region_init(void);
 extern kern_return_t vm_shared_region_enter(
        struct _vm_map          *map,
        struct task             *task,
+       boolean_t               is_64bit,
        void                    *fsroot,
        cpu_type_t              cpu);
 extern kern_return_t vm_shared_region_remove(
@@ -211,7 +247,8 @@ extern void vm_commpage_init(void);
 extern void vm_commpage_text_init(void);
 extern kern_return_t vm_commpage_enter(
        struct _vm_map          *map,
-       struct task             *task);
+       struct task             *task,
+       boolean_t               is64bit);
 extern kern_return_t vm_commpage_remove(
        struct _vm_map          *map,
        struct task             *task);