From 18c389411a0f6283c1b6dffc78bbcfcb237e367b Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Tue, 19 Aug 2025 16:16:10 -0400
Subject: move pager to libjove

---
 apps/init/arch/x86_64/paging.c | 103 +++--------------------------------------
 1 file changed, 6 insertions(+), 97 deletions(-)

(limited to 'apps/init/arch/x86_64/paging.c')

diff --git a/apps/init/arch/x86_64/paging.c b/apps/init/arch/x86_64/paging.c
index 6c1c386..641fc8a 100644
--- a/apps/init/arch/x86_64/paging.c
+++ b/apps/init/arch/x86_64/paging.c
@@ -1,109 +1,18 @@
 #include "../../memory.h"
 #include "jove/object-dir.h"
-#include "jove/jove.h"
+#include "kernel/object.h"
 #include <jove/arch/x86_64/object-pagemap.h>
+#include <jove/arch/x86_64/pager.h>
 #include <stdbool.h>
 
-KernelObjectPageMap init_pagemap;
-unsigned d_cache[3] = { -1, -1, -1 };
-uintptr_t vptr_cache = 0;
-
-KernelObjectUntyped work_page;
-
-#define PMLI_SHL(d) (((4 - d) * 9) + 3)
-#define PMLI_DL(v, d) ((v >> PMLI_SHL(d)) % 512)
-
-uint64_t
-pager_write_path(uintptr_t vptr, uint8_t depth)
-{
-    uint64_t r = 0;
-    if(depth >= 4) return -1;
-
-    uint16_t *path = (uint16_t*)&r;
-    for(uint8_t i = 0; i < depth; i++) path[i] = PMLI_DL(vptr, i);
-    return r;
-}
-
-bool
-pager_depth_exists(uintptr_t vptr, uint8_t depth)
-{
-    uint64_t path = pager_write_path(vptr, depth);
-    if(path == -1) return false;
-
-    return jove_pagemap_exists(&init_pagemap, depth, (uint16_t*)&path);
-}
-/* Places new page in work_page. */
-JoveError
-pager_alloc_page_untyped(void)
-{
-    uint8_t lastmemb = jove_objdir_lastmemb(&untypedDirectory);
-    if(jove_errno) {
-        JoveError err = jove_errno;
-        jove_errno = EJOVE_OK;
-        return err;
-    }
-    
-    KernelObjectUntyped last_untyped;
-    _jove_alloc_untyped_inplace(&last_untyped, &untypedDirectory, lastmemb);
-    
-    if(jove_untyped_size(&last_untyped) == 0x1000) {
-        jove_objdir_move(&untypedDirectory, lastmemb, &__rootdir, work_page.typed.membi);
-        return EJOVE_OK;
-    }
-
-    return jove_untyped_split_inplace(&last_untyped, 0x1000, &work_page);
-}
-
-JoveError
-pager_ensure_at_depth(uint8_t depth, uint16_t *path)
-{
-    int exists = jove_pagemap_exists(&init_pagemap, depth, path);
-    if(exists) {
-        return EJOVE_OK;
-    }
-
-    JoveError pagealloc_err = pager_alloc_page_untyped();
-    if(pagealloc_err) {
-        jove_kprintf("Failed to allocate page with error %i\n", pagealloc_err);
-        return pagealloc_err;
-    }
-    return jove_pagemap_map(&init_pagemap, depth, path, &work_page);
-}
-
-#define PAGER_CACHE_ENSURE_DEPTH(path_seg, d) \
-    if(path_seg[d] != d_cache[d]) { \
-        JoveError d_err = pager_ensure_at_depth(d, path_seg); \
-        if(d_err) return d_err; \
-        d_cache[d] = path_seg[d]; \
-    }
-
-JoveError
-pager_ensure(uintptr_t vptr)
-{
-    uint64_t path = pager_write_path(vptr, 3);
-    if(path == -1) return EJOVE_BADARG;
-
-    vptr &= ~0xFFFULL;
-    uint16_t *path_seg = (uint16_t*)&path;
-    jove_kprintf("%x:%x:%x:%x\n", path_seg[0], path_seg[1], path_seg[2], path_seg[3]);
-
-    PAGER_CACHE_ENSURE_DEPTH(path_seg, 0);
-    PAGER_CACHE_ENSURE_DEPTH(path_seg, 1);
-    PAGER_CACHE_ENSURE_DEPTH(path_seg, 2);
-    if(vptr != vptr_cache) {
-        return pager_ensure_at_depth(3, path_seg);
-    }
-    return EJOVE_OK;
-}
-
 void
 pager_setup(void)
 {
-    _jove_alloc_objdir_inplace(&untypedDirectory, &__rootdir, INIT_OBJECT_UNTYPED_DIR);
-    _jove_alloc_pagemap_inplace(&init_pagemap, &__rootdir, INIT_OBJECT_PAGEMAP);
+    _jove_alloc_pagemap_inplace(&__jove_pagemap, &__rootdir, INIT_OBJECT_PAGEMAP);
 
     size_t lastfree = jove_objdir_lastmemb(&__rootdir) + 1;
-    _jove_alloc_untyped_inplace(&work_page, &__rootdir, lastfree++);
+    __jove_work_obj.membi = lastfree;
+    __jove_work_obj.parent = &__rootdir;
 
-    pager_ensure(0x00000000F0000000);
+    jove_pager_ensure(0x00000000F0000000);
 }
-- 
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