diff --git a/include/functions.h b/include/functions.h
index d2eee60615..0970b330c5 100644
--- a/include/functions.h
+++ b/include/functions.h
@@ -246,7 +246,7 @@ void Sleep_Msec(u32 ms);
 void Sleep_Sec(u32 sec);
 // void __osSetCause(void);
 s32 osSendMesg(OSMesgQueue* mq, OSMesg msg, s32 flags);
-// void osPfsFreeBlocks(void);
+s32 osPfsFreeBlocks(OSPfs* pfs, s32* leftoverBytes);
 void osViExtendVStart(u32 param_1);
 void osStopThread(OSThread* t);
 s32 osRecvMesg(OSMesgQueue* mq, OSMesg* msg, s32 flags);
@@ -325,8 +325,9 @@ void osViSetMode(OSViMode* modep);
 // void __osSetConfig(void);
 void guLookAtF(float mf[4][4], f32 xEye, f32 yEye, f32 zEye, f32 xAt, f32 yAt, f32 zAt, f32 xUp, f32 yUp, f32 zUp);
 void guLookAt(Mtx* m, f32 xEye, f32 yEye, f32 zEye, f32 xAt, f32 yAt, f32 zAt, f32 xUp, f32 yUp, f32 zUp);
-// void osPfsAllocateFile(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE4 param_5, UNK_TYPE4 param_6, UNK_TYPE4 param_7);
-// void __osPfsDeclearPage(UNK_TYPE1 param_1, UNK_TYPE1 param_2, UNK_TYPE1 param_3, UNK_TYPE1 param_4, UNK_TYPE1 param_5, UNK_TYPE4 param_6, UNK_TYPE4 param_7);
+s32 osPfsAllocateFile(OSPfs* pfs, u16 companyCode, u32 gameCode, u8* gameName, u8* extName, s32 fileSize, s32* fileNo);
+s32 __osPfsDeclearPage(OSPfs* pfs, __OSInode* inode, s32 fileSizeInPages, s32* startPage, u8 bank, s32* decleared,
+                       s32* finalPage);
 s32 osStopTimer(OSTimer* t);
 u32 __osProbeTLB(void* param_1);
 void osCreatePiManager(OSPri pri, OSMesgQueue* cmdQ, OSMesg* cmdBuf, s32 cmdMsgCnt);
diff --git a/src/libultra/io/pfsallocatefile.c b/src/libultra/io/pfsallocatefile.c
index fd7bdeef3f..821568b87d 100644
--- a/src/libultra/io/pfsallocatefile.c
+++ b/src/libultra/io/pfsallocatefile.c
@@ -1,5 +1,138 @@
+#include "ultra64.h"
 #include "global.h"
 
-#pragma GLOBAL_ASM("asm/non_matchings/boot/pfsallocatefile/osPfsAllocateFile.s")
+s32 osPfsAllocateFile(OSPfs* pfs, u16 companyCode, u32 gameCode, u8* gameName, u8* extName, s32 fileSize, s32* fileNo) {
+    s32 startPage;
+    s32 decleared;
+    s32 prevPage;
+    s32 oldPrevPage = 0;
+    s32 ret = 0;
+    s32 fileSizeInPages;
+    __OSInode inode;
+    __OSInode backupInode;
+    __OSDir dir;
+    u8 bank;
+    u8 prevBank = 0;
+    s32 firsttime = 0;
+    s32 bytes;
+    __OSInodeUnit fpage;
 
-#pragma GLOBAL_ASM("asm/non_matchings/boot/pfsallocatefile/__osPfsDeclearPage.s")
+    if ((companyCode == 0) || (gameCode == 0)) {
+        return PFS_ERR_INVALID;
+    }
+
+    fileSizeInPages = (fileSize + PFS_PAGE_SIZE - 1) / PFS_PAGE_SIZE;
+
+    if (((ret = osPfsFindFile(pfs, companyCode, gameCode, gameName, extName, fileNo)) != 0) &&
+        (ret != PFS_ERR_INVALID)) {
+        return ret;
+    }
+    if (*fileNo != -1) {
+        return PFS_ERR_EXIST;
+    }
+
+    ret = osPfsFreeBlocks(pfs, &bytes);
+    if (fileSize > bytes) {
+        return PFS_DATA_FULL;
+    }
+
+    if (fileSizeInPages == 0) {
+        return (PFS_ERR_INVALID);
+    }
+
+    if (((ret = osPfsFindFile(pfs, 0, 0, NULL, NULL, fileNo)) != 0) && (ret != PFS_ERR_INVALID)) {
+        return ret;
+    }
+    if (*fileNo == -1) {
+        return PFS_DIR_FULL;
+    }
+
+    for (bank = PFS_ID_BANK_256K; bank < pfs->banks; bank++) {
+        if ((ret = __osPfsRWInode(pfs, &inode, PFS_READ, bank)) != 0) {
+            return ret;
+        }
+        ret = __osPfsDeclearPage(pfs, &inode, fileSizeInPages, &startPage, bank, &decleared, &prevPage);
+        if (ret) {
+            return ret;
+        }
+        if (startPage != -1) { /* There is free space */
+            if (firsttime == 0) {
+                fpage.inode_t.page = (u8)startPage;
+                fpage.inode_t.bank = bank;
+            } else { /* Writing previous bank inode */
+                backupInode.inodePage[oldPrevPage].inode_t.bank = bank;
+                backupInode.inodePage[oldPrevPage].inode_t.page = (u8)startPage;
+                if ((ret = __osPfsRWInode(pfs, &backupInode, PFS_WRITE, prevBank)) != 0) {
+                    return ret;
+                }
+            }
+            if (fileSizeInPages > decleared) {
+                bcopy(&inode, &backupInode, sizeof(__OSInode));
+                oldPrevPage = prevPage;
+                prevBank = bank;
+                fileSizeInPages -= decleared;
+                firsttime++;
+            } else {
+                fileSizeInPages = 0;
+                if ((ret = __osPfsRWInode(pfs, &inode, PFS_WRITE, bank)) != 0) {
+                    return ret;
+                }
+                break;
+            }
+        }
+    }
+    if ((fileSizeInPages > 0) || (startPage == -1)) {
+        return PFS_ERR_INCONSISTENT;
+    }
+
+    dir.start_page = fpage;
+    dir.company_code = companyCode;
+    dir.game_code = gameCode;
+    dir.data_sum = 0;
+
+    bcopy(gameName, dir.game_name, PFS_FILE_NAME_LEN);
+    bcopy(extName, dir.ext_name, PFS_FILE_EXT_LEN);
+
+    return __osContRamWrite(pfs->queue, pfs->channel, pfs->dir_table + *fileNo, (u8*)&dir, 0);
+}
+
+s32 __osPfsDeclearPage(OSPfs* pfs, __OSInode* inode, s32 fileSizeInPages, s32* startPage, u8 bank, s32* decleared,
+                       s32* finalPage) {
+    s32 j;
+    s32 spage, prevPage;
+    s32 ret = 0;
+    s32 offset = ((bank > PFS_ID_BANK_256K) ? 1 : pfs->inodeStartPage);
+
+    for (j = offset; j < PFS_INODE_SIZE_PER_PAGE; j++) {
+        if (inode->inodePage[j].ipage == PFS_PAGE_NOT_USED) {
+            break;
+        }
+    }
+    if (j == PFS_INODE_SIZE_PER_PAGE) {
+        *startPage = -1;
+        return ret;
+    }
+
+    spage = j;
+    *decleared = 1;
+    prevPage = j;
+    j++;
+    while ((fileSizeInPages > *decleared) && (j < PFS_INODE_SIZE_PER_PAGE)) {
+        if (inode->inodePage[j].ipage == PFS_PAGE_NOT_USED) {
+            inode->inodePage[prevPage].inode_t.bank = bank;
+            inode->inodePage[prevPage].inode_t.page = j;
+            prevPage = j;
+            (*decleared)++;
+        }
+        j++;
+    }
+
+    *startPage = spage;
+    if ((j == (PFS_INODE_SIZE_PER_PAGE)) && (fileSizeInPages > *decleared)) {
+        *finalPage = prevPage;
+    } else {
+        inode->inodePage[prevPage].ipage = PFS_EOF;
+        *finalPage = 0;
+    }
+    return ret;
+}