From b66e8e0c9999565c78d6d207f904c8d3ec1148e4 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Sun, 23 Nov 2025 13:37:23 -0500
Subject: kern: lib: Add pointerbox physmem allocation

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 sys/lib/ptrbox.c | 41 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)

(limited to 'sys/lib/ptrbox.c')

diff --git a/sys/lib/ptrbox.c b/sys/lib/ptrbox.c
index d2e9171..b2777dc 100644
--- a/sys/lib/ptrbox.c
+++ b/sys/lib/ptrbox.c
@@ -29,10 +29,43 @@
 
 #include <sys/types.h>
 #include <sys/cdefs.h>
+#include <sys/param.h>
 #include <sys/errno.h>
 #include <vm/kalloc.h>
+#include <vm/phys.h>
+#include <vm/vm.h>
 #include <lib/ptrbox.h>
 
+static void *
+ptrbox_physalloc(struct ptrbox *pbox, size_t len)
+{
+    struct ptrbox_aldes *aldes;
+    uintptr_t paddr;
+
+    len = ALIGN_UP(len, PAGESIZE);
+    paddr = vm_phys_alloc(len / PAGESIZE);
+    if (paddr == 0) {
+        return NULL;
+    }
+
+    /* Allocate a descriptor */
+    aldes = kalloc(sizeof(*aldes));
+    if (aldes == NULL) {
+        vm_phys_free(paddr, len / PAGESIZE);
+        return NULL;
+    }
+
+    /* Initialize our descriptor */
+    aldes->type = PTRBOX_PHYSMEM;
+    aldes->phys = paddr;
+    aldes->length = len;
+
+    /* Push it to the pointer box */
+    TAILQ_INSERT_TAIL(&pbox->allist, aldes, link);
+    ++pbox->alcnt;
+    return PHYS_TO_VIRT(paddr);
+}
+
 static void *
 ptrbox_heapalloc(struct ptrbox *pbox, size_t len)
 {
@@ -76,6 +109,8 @@ ptrbox_alloc(struct ptrbox *pbox, size_t len, ptrbox_altype_t type)
     switch (type) {
     case PTRBOX_HEAP:
         return ptrbox_heapalloc(pbox, len);
+    case PTRBOX_PHYSMEM:
+        return ptrbox_physalloc(pbox, len);
     default:
         return NULL;
     }
@@ -106,6 +141,12 @@ ptrbox_free(struct ptrbox *pbox)
         case PTRBOX_HEAP:
             kfree(desc->base);
             break;
+        case PTRBOX_PHYSMEM:
+            vm_phys_free(
+                desc->phys,
+                desc->length / PAGESIZE
+            );
+            break;
         }
 
         kfree(desc);
-- 
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