diff --git a/src/libultra/io/pfsfilestate.c b/src/libultra/io/pfsfilestate.c
index ad6737ab10..a555199fcc 100644
--- a/src/libultra/io/pfsfilestate.c
+++ b/src/libultra/io/pfsfilestate.c
@@ -1,3 +1,71 @@
+#include "PR/pfs.h"
 #include "global.h"
 
-#pragma GLOBAL_ASM("asm/non_matchings/boot/pfsfilestate/osPfsFileState.s")
+s32 osPfsFileState(OSPfs* pfs, s32 fileNo, OSPfsState* state) {
+    s32 ret;
+    s32 pages;
+    __OSInode inode;
+    __OSDir dir;
+    __OSInodeUnit page;
+    u8 bank;
+
+    if (fileNo >= pfs->dir_size || fileNo < 0) {
+        return PFS_ERR_INVALID;
+    }
+
+    if (!(pfs->status & PFS_INITIALIZED)) {
+        return PFS_ERR_INVALID;
+    }
+
+    ret = __osCheckId(pfs);
+    if (ret != 0) {
+        return ret;
+    }
+
+    if (pfs->activebank != 0) {
+        ret = __osPfsSelectBank(pfs, PFS_ID_BANK_256K);
+        if (ret != 0) {
+            return ret;
+        }
+    }
+
+    ret = __osContRamRead(pfs->queue, pfs->channel, pfs->dir_table + fileNo, (u8*)&dir);
+    if (ret != 0) {
+        return ret;
+    }
+
+    if (dir.company_code == 0 || dir.game_code == 0) {
+        return PFS_ERR_INVALID;
+    }
+
+    page = dir.start_page;
+    pages = 0;
+    bank = 0xFF;
+
+    while (true) {
+        if (page.ipage < pfs->inodeStartPage) {
+            break;
+        }
+        if (page.inode_t.bank != bank) {
+            bank = page.inode_t.bank;
+
+            ret = __osPfsRWInode(pfs, &inode, PFS_READ, bank);
+            if (ret != 0) {
+                return ret;
+            }
+        }
+        pages++;
+        page = inode.inodePage[page.inode_t.page];
+    }
+    if (page.ipage != PFS_EOF) {
+        return PFS_ERR_INCONSISTENT;
+    }
+
+    state->file_size = pages * PFS_ONE_PAGE * BLOCKSIZE;
+    state->company_code = dir.company_code;
+    state->game_code = dir.game_code;
+    bcopy(&dir.game_name, state->game_name, PFS_FILE_NAME_LEN);
+    bcopy(&dir.ext_name, state->ext_name, PFS_FILE_EXT_LEN);
+
+    return __osPfsGetStatus(pfs->queue, pfs->channel);
+}