mirror of
https://github.com/elliotnunn/powermac-rom.git
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Reverse the NanoKernel pool allocator
This commit is contained in:
Elliot Nunn
parent
c7d4cdd367
commit
fb06fc2b80
@ -110,8 +110,8 @@ RTASLock ds.l 8 ; -b10:-af0
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DbugLock ds.l 8 ; -af0:-ad0
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PoolLock ds.l 8 ; -ad0:-ab0
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FreePool ds.l 4 ; -ab0 ; LLL with signature 'POOL'
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ds.l 1 ; -aa0
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ds.l 1 ; -a9c
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FirstPoolSeg ds.l 1 ; -aa0 ; singly linked list (=>BGN=>END=>BGN...)
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FirstPoolSegLogical ds.l 1 ; -a9c
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IndexPtr ds.l 1 ; -a98 ; index of opaque IDs
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CoherenceGrpList ds.l 4 ; -a94:-a84 ; signature 'GRPS'
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TimerQueue ds.l 16 ; -a84:-a44 ; there are more of these in the pool
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@ -910,16 +910,6 @@ Size equ *
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PoolPage record 0,INCR
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FreeBytes ds.l 1 ; 000
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org 4096
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Size equ *
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endr
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; Special opaque NanoKernel stuff!
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@ -109,7 +109,7 @@ convert_pmdts_to_areas ; OUTSIDE REFERER
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; 61F168F1 (magic bus error incantation)
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ Local_Panic
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@ -144,7 +144,7 @@ convert_pmdts_to_areas ; OUTSIDE REFERER
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; DEADBEEF (all over the place)
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ Local_Panic
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@ -205,7 +205,7 @@ convert_pmdts_to_areas ; OUTSIDE REFERER
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ Local_Panic
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@ -302,7 +302,7 @@ convert_pmdts_to_areas ; OUTSIDE REFERER
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; Else replace FailedArea with an Area copied from NewArea
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ Local_Panic
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@ -340,7 +340,7 @@ convert_pmdts_to_areas ; OUTSIDE REFERER
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@pmdt_flags_are_c00
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_clog ' pmdt_flags_are_c00^n'
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ Local_Panic
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@ -522,7 +522,7 @@ NKCreateAddressSpaceSub
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; Create the AddressSpace
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li r8, AddressSpace.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq- @fail_OOM
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@ -581,7 +581,7 @@ NKCreateAddressSpaceSub
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; Allocate the Area, check for errors
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r29, r8
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beq- @fail_OOM_again
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@ -812,7 +812,7 @@ MPCreateArea
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; Allocate the new Area
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ ReleaseAndScrambleMPCall
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@ -1136,7 +1136,7 @@ createarea_0x3b8
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; r1 = kdp
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; r8 = size
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bl PoolAlloc
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bl PoolAllocClear
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; r8 = ptr
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cmpwi r8, 0x00
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@ -1159,7 +1159,7 @@ createarea_0x41c
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; r1 = kdp
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; r8 = size
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bl PoolAlloc
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bl PoolAllocClear
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; r8 = ptr
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cmpwi r8, 0x00
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@ -1489,7 +1489,7 @@ MPCreateAliasArea
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; Allocate the new Area
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li r8, Area.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ ReleaseAndScrambleMPCall
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@ -1957,7 +1957,7 @@ MPCall_130_0x11c
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; r1 = kdp
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; r8 = size
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bl PoolAlloc
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bl PoolAllocClear
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; r8 = ptr
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mr. r16, r8
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@ -41,8 +41,10 @@ kIntAlign equ 5
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; IRP is 10 pages below KDP (measured start to start)
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; This should be neatened up to describe the kernel global area
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IRPOffset equ (-10) * 4096
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kKDPfromIRP equ 10 * 4096
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kPoolOffsetFromGlobals equ (-7) * 4096 ; goes all the way up to 24 bytes short of PSA
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@ -28,7 +28,7 @@ InitIDIndex
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mflr r23
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li r8, Index.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r22, r8
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stw r8, PSA.IndexPtr(r1)
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@ -46,7 +46,7 @@ InitIDIndex
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; Then what the hell is this?
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li r8, 0xfd8
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bl PoolAlloc
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bl PoolAllocClear
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cmpwi r8, 0
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stw r8, Index.IDsPtr(r22)
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@ -117,7 +117,7 @@ MakeID
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; r1 = kdp
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; r8 = size
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bl PoolAlloc
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bl PoolAllocClear
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; r8 = ptr
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mr. r18, r8
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@ -760,7 +760,7 @@ SetProcessorFlags
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; Allocate and check
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li r8, 32 ;Process.Size
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bl PoolAlloc ; takes size and returns ptr, all in r8
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bl PoolAllocClear ; takes size and returns ptr, all in r8
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mr. r31, r8
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beq- Init_Panic
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@ -800,7 +800,7 @@ SetProcessorFlags
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; Allocate the main structure in the kernel pool, and check for a null ptr
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li r8, 0x58 ;CoherenceGroup.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq- Init_Panic
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@ -566,7 +566,7 @@ major_0x02ccc_0x430
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mfcr r28
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li r8, 0x1c
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beq- cr2, major_0x02ccc_0x4a8
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bl PoolAlloc_with_crset
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bl PoolAlloc
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mr. r26, r8
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beq- major_0x02ccc_0x50c
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addi r17, r31, 0x08
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@ -957,7 +957,7 @@ KCCreateProcess ; OUTSIDE REFERER
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bne+ ReleaseAndReturnMPCallInvalidIDErr
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li r8, 0x20 ;Process.Size
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bl PoolAlloc
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bl PoolAllocClear
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mr. r31, r8
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beq+ ReleaseAndScrambleMPCall
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@ -1521,7 +1521,7 @@ KCCreateCpuStruct_0x24
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; r1 = kdp
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; r8 = size
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bl PoolAlloc
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bl PoolAllocClear
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; r8 = ptr
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mr. r31, r8
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@ -1,270 +1,357 @@
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Local_Panic set *
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b panic
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; SEGMENTS
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;
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; The pool is made up of segments of contiguous memory. The first segment
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; to be created is about 25k, running from 0x7000 below r1 to the start of
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; the Primary System Area. It is initialised by InitPool. Every subsequent
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; segment occupies a single page, plucked from the system free list by
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; ExtendPool.
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;
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;
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; BLOCKS
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;
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; Each segment is an array of variously sized blocks, with no gaps between
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; them. The first block is a Begin (‡BGN) block, the last block is an End
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; block (‡END), and all others are Allocated (‡loc) or Free (free) blocks.
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; To allow the data in each Allocated block to be 16b-aligned, all
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; Allocated and Free blocks start 8b below a 16b boundary.
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;
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;
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; SINGLY LINKED LIST OF SEGMENTS
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;
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; PSA.FirstPoolSeg points to the start of the most recently added pool
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; segment, i.e. to its Begin block. The OffsetToNext field of a Begin
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; block points not to the block immediately beyond it in memory, but to
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; the segment's End block. The OffsetToNext field of the End block points
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; to the start of the next most recently added pool segment. If there is
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; none, it contains zero.
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;
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;
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; DOUBLY LINKED LIST OF FREE BLOCKS
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;
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; Every free block is a member of PSA.FreePool, a doubly linked list of
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; free segments. The "LLL" structure occupies the first 16 bytes of the
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; block.
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; InitPool
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Block record
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; Allocate one page for the kernel pool. Same layout at
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; Memtop starts at 7 pages below KDP.
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; Take note of the structure from kdp-ab0 to kdp-aa0
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kBeginSize equ 8
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kEndSize equ 24
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; Xrefs:
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; setup
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kPoolSig equ 'POOL'
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kBeginSig equ '‡BGN'
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kEndSig equ '‡END'
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kAllocSig equ '‡loc'
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kFreeSig equ 'free'
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; > r1 = kdp
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; For free and allocated blocks, points to the next block
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; For begin blocks, points to corresponding end block
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; For end blocks, points to another begin block (or zero)
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OffsetToNext ds.l 1 ; 0
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InitPool ; OUTSIDE REFERER
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Signature ds.l 1 ; 4
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Data
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LogiNextSeg
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FreeNext ds.l 1 ; 8
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FreePrev ds.l 1 ; c
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endr
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_PoolPanic
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b panic
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; Use all the memory from r1 - 0x7000 to PSA
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InitPool
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; Add first segment to global singly linked list
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; r9 = LA_KD - 7 pages
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lwz r8, KDP.PA_ConfigInfo(r1)
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lwz r8, NKConfigurationInfo.LA_KernelData(r8)
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lisori r9, 0x7000
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lisori r9, -kPoolOffsetFromGlobals
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subf r9, r9, r8
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stw r9, -0x0a9c(r1)
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stw r9, PSA.FirstPoolSegLogical(r1)
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lisori r9, -0x7000
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lisori r9, kPoolOffsetFromGlobals
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add r9, r9, r1
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stw r9, -0x0aa0(r1)
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stw r9, PSA.FirstPoolSeg(r1)
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; bit of a mystery
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lisori r8, 0x00006458
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; Decide how big the segment will be
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_pool_first_seg equ PSA.Base - kPoolOffsetFromGlobals
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; Begin block (leave ptr to End in r23)
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lisori r8, _pool_first_seg - Block.kEndSize
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add r23, r8, r9
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stw r8, 0x0000(r9)
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stw r8, Block.OffsetToNext(r9)
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lisori r8, '‡BGN'
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stw r8, 0x0004(r9)
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lisori r8, Block.kBeginSig
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stw r8, Block.Signature(r9)
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addi r9, r9, 0x08
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lisori r8, 0x00006450
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stw r8, 0x0000(r9)
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lisori r8, 'free'
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stw r8, 0x0004(r9)
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; Free block (leave ptr in r9)
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li r8, 0x00
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stw r8, 0x0000(r23)
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addi r9, r9, Block.kBeginSize
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lisori r8, _pool_first_seg - Block.kEndSize - Block.kBeginSize
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stw r8, Block.OffsetToNext(r9)
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lisori r8, '‡END'
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stw r8, 0x0004(r23)
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lisori r8, Block.kFreeSig
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stw r8, Block.Signature(r9)
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; set up linked list
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addi r8, r1, PSA.FreePool
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stw r9, LLL.Next(r8)
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stw r9, LLL.Prev(r8)
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stw r8, LLL.Next(r9)
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stw r8, LLL.Prev(r9)
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; End block
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lisori r9, 'POOL'
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stw r9, LLL.Signature(r8)
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li r8, 0
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stw r8, Block.OffsetToNext(r23)
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lisori r8, Block.kEndSig
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stw r8, Block.Signature(r23)
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; Add Free block to global doubly linked list
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addi r8, r1, PSA.FreePool
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stw r9, Block.FreeNext(r8)
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stw r9, Block.FreePrev(r8)
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stw r8, Block.FreeNext(r9)
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stw r8, Block.FreePrev(r9)
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lisori r9, Block.kPoolSig
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stw r9, Block.Signature(r8)
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; Return
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blr
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; PoolAlloc
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; The NanoKernel's malloc
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; Easy to use! 0xfd8 (a page minus 10 words) is the
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; largest request that can be satisfied.
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; ARG size r8
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; RET ptr r8
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; Xrefs:
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; setup
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; major_0x02ccc
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; KCCreateProcess
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; KCCreateCpuStruct
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; MPCall_15
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; MPCall_39
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; MPCall_17
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; MPCall_20
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; MPCall_25
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; MPCall_49
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; MPCall_40
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; MPCall_31
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; MPCall_64
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; CauseNotification
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; CreateTask
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; MPCall_58
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; convert_pmdts_to_areas
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; NKCreateAddressSpaceSub
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; MPCall_72
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; createarea
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; MPCall_73
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; MPCall_130
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; InitTMRQs
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; InitIDIndex
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; MakeID
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_poolalloc_noclr_cr_bit equ 30
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; > r1 = kdp
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; > r8 = size
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; < r8 = ptr
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PoolAlloc ; OUTSIDE REFERER
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crclr cr7_eq
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b PoolAllocCommon
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PoolAlloc_with_crset ; OUTSIDE REFERER
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crset cr7_eq
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PoolAllocCommon
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PoolAllocClear
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crclr _poolalloc_noclr_cr_bit
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b _PoolAllocCommon
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PoolAlloc
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crset _poolalloc_noclr_cr_bit
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_PoolAllocCommon
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; Save LR and arg to EWA. Get lock.
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mflr r17
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mfsprg r18, 0
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_Lock PSA.PoolLock, scratch1=r15, scratch2=r16
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; These saves are my first real hint at the contents of that
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; large unexplored area of the EWA. This file, then, owns
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; part of the EWA, for its CPU-scoped globals. Because the
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; kernel runs stackless.
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stw r17, EWA.PoolSavedLR(r18)
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stw r8, EWA.PoolSavedSizeArg(r18)
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@try_again
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; Check that requested allocation is in the doable size range.
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mflr r17
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mfsprg r18, 0
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_Lock PSA.PoolLock, scratch1=r15, scratch2=r16
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; These saves are my first real hint at the contents of that
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; large unexplored area of the EWA. This file, then, owns
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; part of the EWA, for its CPU-scoped globals. Because the
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; kernel runs stackless.
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stw r17, EWA.PoolSavedLR(r18)
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stw r8, EWA.PoolSavedSizeArg(r18)
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@recheck_for_new_block
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; Sanity checks
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cmpwi r8, 0
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cmpwi cr1, r8, 0xfd8
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ble+ Local_Panic ; zero-byte request => thud
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ble+ _PoolPanic
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bgt- cr1, @request_too_large
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addi r8, r8, 39
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rlwinm r8, r8, 0, 0, 26
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; Up-align to 32b boundary and snatch an extra 8b
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; This is our minimum OffsetToNext field
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addi r8, r8, 8 + 31
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rlwinm r8, r8, 0, 0xffffffe0
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; Check that the pool has any pages in it.
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; Iterate the free-block list
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addi r14, r1, PSA.FreePool
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lwz r15, LLL.Next(r14)
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@try_different_page
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@next_block
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cmpw r14, r15
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bne+ @try_block
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; Global free-block list is empty (not great news)
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bne+ @pool_has_page
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; Got a free page in the system free list? It's ours.
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li r8, 0 ; return zero if there is no page at all
|
||||
li r9, 1 ; number of pages to grab
|
||||
|
||||
; No? Then claim a page from the system free list for the pool?
|
||||
|
||||
; Got a free page in the system free list? It's ours.
|
||||
li r8, 0 ; return zero if there is no page at all
|
||||
li r9, 1 ; number of pages to grab
|
||||
|
||||
lwz r16, PSA.FreePageCount(r1)
|
||||
lwz r17, PSA.UnheldFreePageCount(r1)
|
||||
subf. r16, r9, r16
|
||||
subf r17, r9, r17
|
||||
blt- PoolCommonReturn
|
||||
|
||||
stw r16, PSA.FreePageCount(r1)
|
||||
stw r17, PSA.UnheldFreePageCount(r1)
|
||||
|
||||
; Get that page, mofo. Macros FTW.
|
||||
lwz r8, PSA.FreeList + LLL.Next(r1)
|
||||
RemoveFromList r8, scratch1=r17, scratch2=r18
|
||||
|
||||
; There was probably once a mechanism for virtual addressing of the pool!
|
||||
li r9, 0
|
||||
bl ExtendPool ; r8=page, r9=virt=0
|
||||
lwz r16, PSA.FreePageCount(r1)
|
||||
lwz r17, PSA.UnheldFreePageCount(r1)
|
||||
subf. r16, r9, r16
|
||||
subf r17, r9, r17
|
||||
blt- _PoolReturn
|
||||
|
||||
stw r16, PSA.FreePageCount(r1)
|
||||
stw r17, PSA.UnheldFreePageCount(r1)
|
||||
|
||||
; Get that page, mofo. Macros FTW.
|
||||
lwz r8, PSA.FreeList + LLL.Next(r1)
|
||||
RemoveFromList r8, scratch1=r17, scratch2=r18
|
||||
|
||||
; There was probably once a mechanism for virtual addressing of the pool!
|
||||
li r9, 0
|
||||
bl ExtendPool ; r8=page, r9=virt=0
|
||||
|
||||
; Now that the pool is not empty, start over.
|
||||
mfsprg r18, 0
|
||||
lwz r8, EWA.PoolSavedSizeArg(r18)
|
||||
b @try_again
|
||||
b @recheck_for_new_block
|
||||
|
||||
|
||||
; Request was greater than the maximum block size
|
||||
|
||||
@request_too_large
|
||||
li r8, 0
|
||||
b PoolCommonReturn
|
||||
|
||||
@pool_has_page
|
||||
; We have a page (r15) that might have room in it.
|
||||
; r8 contains the size describing our actual demand on the page!
|
||||
|
||||
lwz r16, PoolPage.FreeBytes(r15)
|
||||
li r8, 0
|
||||
b _PoolReturn
|
||||
|
||||
|
||||
; Try the free block that r15 points to
|
||||
|
||||
@try_block
|
||||
@retry_newly_expanded_block
|
||||
|
||||
lwz r16, Block.OffsetToNext(r15)
|
||||
cmplw r16, r8
|
||||
|
||||
lis r20, 'fr'
|
||||
bgt- @fits_with_leftover_space
|
||||
beq- @fits_perfectly
|
||||
bgt- @decide_whether_to_split
|
||||
beq- @do_not_split
|
||||
ori r20, r20, 'ee'
|
||||
|
||||
lwz r16, PoolPage.FreeBytes(r15)
|
||||
add r18, r16, r15 ; r18 = ???
|
||||
lwz r19, 0x0004(r18)
|
||||
|
||||
; This block is too small to fit our allocation, but can it be mashed together
|
||||
; with a physically adjacent free block? This might happen a few times before
|
||||
; we decide to give up and search for another block.
|
||||
|
||||
lwz r16, Block.OffsetToNext(r15)
|
||||
add r18, r16, r15
|
||||
lwz r19, Block.Signature(r18)
|
||||
cmplw cr1, r18, r15
|
||||
cmpw r19, r20
|
||||
ble+ cr1, Local_Panic
|
||||
bne- @_118
|
||||
lwz r17, 0x0000(r18)
|
||||
rotlwi r19, r19, 0x08
|
||||
ble+ cr1, _PoolPanic
|
||||
bne- @physically_adjacent_block_is_not_free
|
||||
|
||||
lwz r17, Block.OffsetToNext(r18)
|
||||
rotlwi r19, r19, 8
|
||||
add r17, r17, r16
|
||||
stw r17, 0x0000(r15)
|
||||
stw r19, 0x0004(r18)
|
||||
lwz r17, 0x000c(r18)
|
||||
lwz r16, LLL.Next(r18)
|
||||
stw r16, LLL.Next(r17)
|
||||
stw r17, 0x000c(r16)
|
||||
b @pool_has_page
|
||||
stw r17, Block.OffsetToNext(r15)
|
||||
stw r19, Block.Signature(r18) ; scramble old signature to clarify mem dumps
|
||||
lwz r17, Block.FreePrev(r18)
|
||||
lwz r16, Block.FreeNext(r18)
|
||||
stw r16, Block.FreeNext(r17)
|
||||
stw r17, Block.FreePrev(r16)
|
||||
|
||||
@_118
|
||||
lwz r15, LLL.Next(r15)
|
||||
b @try_different_page
|
||||
b @retry_newly_expanded_block
|
||||
@physically_adjacent_block_is_not_free
|
||||
|
||||
lwz r15, Block.FreeNext(r15)
|
||||
b @next_block
|
||||
|
||||
|
||||
; Success: split the block if there is >=40b left over
|
||||
|
||||
@decide_whether_to_split
|
||||
|
||||
@fits_with_leftover_space
|
||||
subf r16, r8, r16
|
||||
cmpwi r16, 0x28
|
||||
blt- @fits_perfectly
|
||||
stw r16, 0x0000(r15)
|
||||
add r15, r15, r16
|
||||
stw r8, 0x0000(r15)
|
||||
b @_14c
|
||||
cmpwi r16, 40
|
||||
blt- @do_not_split
|
||||
|
||||
|
||||
; Use the rightmost part of the block, leaving ptr in r15
|
||||
; (Leaving the leftmost part saves us touching the free block list)
|
||||
|
||||
stw r16, Block.OffsetToNext(r15)
|
||||
add r15, r15, r16
|
||||
stw r8, Block.OffsetToNext(r15)
|
||||
b @proceed_with_block
|
||||
|
||||
|
||||
; Success: use the entire block, leaving ptr in r15
|
||||
|
||||
@do_not_split
|
||||
|
||||
@fits_perfectly
|
||||
lwz r14, 0x000c(r15)
|
||||
lwz r16, LLL.Next(r15)
|
||||
stw r16, LLL.Next(r14)
|
||||
stw r14, 0x000c(r16)
|
||||
|
||||
@_14c
|
||||
lisori r8, '‡loc'
|
||||
stw r8, 0x0004(r15)
|
||||
addi r8, r15, 0x08
|
||||
|
||||
beq- cr7, PoolCommonReturn
|
||||
lwz r16, 0x0000(r15)
|
||||
addi r16, r16, -0x08
|
||||
li r14, 0x00
|
||||
|
||||
; Sign the block and return data ptr in r8
|
||||
|
||||
@proceed_with_block
|
||||
|
||||
lisori r8, Block.kAllocSig
|
||||
stw r8, Block.Signature(r15)
|
||||
|
||||
addi r8, r15, Block.Data
|
||||
|
||||
|
||||
; Optionally clear the block (quicker if we don't)
|
||||
|
||||
bc BO_IF, _poolalloc_noclr_cr_bit, _PoolReturn
|
||||
lwz r16, Block.OffsetToNext(r15)
|
||||
subi r16, r16, Block.Data
|
||||
li r14, 0
|
||||
add r16, r16, r15
|
||||
addi r15, r15, 0x04
|
||||
addi r15, r15, 4
|
||||
|
||||
@_174
|
||||
stwu r14, 0x0004(r15)
|
||||
@clrloop
|
||||
stwu r14, 4(r15)
|
||||
cmpw r15, r16
|
||||
ble+ @_174
|
||||
b PoolCommonReturn
|
||||
ble+ @clrloop
|
||||
|
||||
b _PoolReturn
|
||||
|
||||
|
||||
|
||||
; PoolFree
|
||||
; The NanoKernel's free
|
||||
|
||||
; ARG void *r8
|
||||
; ARG r8 = ptr to contents of pool block
|
||||
|
||||
PoolFree
|
||||
|
||||
PoolFree ; OUTSIDE REFERER
|
||||
mflr r17
|
||||
mfsprg r18, 0
|
||||
|
||||
_Lock PSA.PoolLock, scratch1=r15, scratch2=r16
|
||||
|
||||
stw r17, EWA.PoolSavedLR(r18)
|
||||
bl major_0x129fc
|
||||
bl major_0x12a34
|
||||
bl _PoolAddBlockToFreeList
|
||||
bl _PoolMergeAdjacentFreeBlocks
|
||||
|
||||
; Fall through...
|
||||
|
||||
|
||||
|
||||
; File-internal
|
||||
; PoolAlloc and PoolFree save LR on entry, then return this way
|
||||
|
||||
; Return path of most of these functions?
|
||||
; Releases Pool lock and Returns to the link
|
||||
; address saved in EWA.
|
||||
_PoolReturn
|
||||
|
||||
PoolCommonReturn ; OUTSIDE REFERER
|
||||
mfsprg r18, 0
|
||||
|
||||
_AssertAndRelease PSA.PoolLock, scratch=r15
|
||||
@ -275,96 +362,91 @@ PoolCommonReturn ; OUTSIDE REFERER
|
||||
|
||||
|
||||
|
||||
; major_0x129fc
|
||||
; Re-label an Allocated block as Free, and add it to the global list
|
||||
; Panics if block is not Allocated to start with!
|
||||
|
||||
; Xrefs:
|
||||
; PoolFree
|
||||
; ExtendPool
|
||||
; ARG r8 = ptr to contents of pool block
|
||||
; RET r15 = ptr to pool block itself (r8 - 8)
|
||||
|
||||
; ARG Area *r8
|
||||
_PoolAddBlockToFreeList
|
||||
|
||||
major_0x129fc ; OUTSIDE REFERER
|
||||
subi r15, r8, 8
|
||||
; Get the block containing the data
|
||||
subi r15, r8, Block.Data
|
||||
|
||||
lis r20, 'fr'
|
||||
lhz r16, 4(r15)
|
||||
ori r20, r20, 'ee'
|
||||
cmplwi r16, 0x876c
|
||||
bne+ Local_Panic
|
||||
stw r20, 4(r15)
|
||||
; Change the signature
|
||||
_lstart r20, Block.kFreeSig
|
||||
lhz r16, Block.Signature(r15)
|
||||
_lfinish
|
||||
cmplwi r16, 0x876c ; Block.kAllocSig >> 16
|
||||
bne+ _PoolPanic
|
||||
stw r20, Block.Signature(r15)
|
||||
|
||||
; Insert into the global free block list
|
||||
addi r16, r1, PSA.FreePool
|
||||
|
||||
InsertAsPrev r15, r16, scratch=r17
|
||||
|
||||
blr
|
||||
|
||||
|
||||
|
||||
; major_0x12a34
|
||||
; Merge a free block with any free blocks to the right
|
||||
; (Cannot look to the left because list is singly linked)
|
||||
|
||||
; Xrefs:
|
||||
; PoolFree
|
||||
; ExtendPool
|
||||
; ARG r15 = ptr to free block
|
||||
|
||||
major_0x12a34 ; OUTSIDE REFERER
|
||||
lis r20, 0x6672
|
||||
lwz r16, 0x0000(r15)
|
||||
ori r20, r20, 0x6565
|
||||
add r18, r16, r15
|
||||
lwz r19, 0x0004(r18)
|
||||
_PoolMergeAdjacentFreeBlocks
|
||||
|
||||
@next_segment
|
||||
_lstart r20, Block.kFreeSig
|
||||
lwz r16, Block.OffsetToNext(r15)
|
||||
_lfinish
|
||||
add r18, r16, r15 ; r18 = block to the right
|
||||
lwz r19, Block.Signature(r18) ; r19 = signature of that block
|
||||
cmplw cr1, r18, r15
|
||||
cmpw r19, r20
|
||||
ble+ cr1, Local_Panic
|
||||
bnelr-
|
||||
lwz r17, 0x0000(r18)
|
||||
rotlwi r19, r19, 0x08
|
||||
ble+ cr1, _PoolPanic ; die if block was of non-positive size!
|
||||
bnelr- ; return if block to right is not free
|
||||
|
||||
lwz r17, Block.OffsetToNext(r18)
|
||||
rotlwi r19, r19, 8 ; scramble old signature to clarify mem dumps
|
||||
add r17, r17, r16
|
||||
stw r17, 0x0000(r15)
|
||||
stw r19, 0x0004(r18)
|
||||
lwz r17, 0x000c(r18)
|
||||
lwz r16, LLL.Next(r18)
|
||||
stw r16, LLL.Next(r17)
|
||||
stw r17, 0x000c(r16)
|
||||
b major_0x12a34
|
||||
stw r17, Block.OffsetToNext(r15) ; increase the size of the main block
|
||||
stw r19, Block.Signature(r18)
|
||||
|
||||
lwz r17, Block.FreePrev(r18) ; remove the absorbed block from the list of free blocks
|
||||
lwz r16, Block.FreeNext(r18)
|
||||
stw r16, Block.FreeNext(r17)
|
||||
stw r17, Block.FreePrev(r16)
|
||||
|
||||
b @next_segment
|
||||
|
||||
|
||||
|
||||
; ExtendPool
|
||||
; Create a new pool segment from a physical page
|
||||
|
||||
; 0xed0(r1) = pool extends (I increment)
|
||||
; -0xa9c(r1) = virt last page (I update)
|
||||
; -0xaa0(r1) = phys last page (I update)
|
||||
; Assumes that cache blocks are 32 bytes! Uh-oh.
|
||||
; Page gets decorated like this:
|
||||
; 000: 00 00 0f e8
|
||||
; 004: 87 'B 'G 'N
|
||||
; 008: 00 00 0f e8
|
||||
; 00c: 87 'l 'o 'c
|
||||
; ... zeros << r8 passes ptr to here
|
||||
; fe8: phys offset from here to prev page
|
||||
; fec: 87 'E 'N 'D
|
||||
; ff0: logical abs address of prev page
|
||||
; ff4: 00 00 00 00
|
||||
; ff8: 00 00 00 00
|
||||
; ffc: 00 00 00 00
|
||||
; ARG PhysPtr r8, LogiPtr r9
|
||||
|
||||
; Xrefs:
|
||||
; MPCall_0
|
||||
; PoolAlloc
|
||||
ExtendPool
|
||||
|
||||
; > r1 = kdp
|
||||
; > r8 = anywhere in new page (phys)
|
||||
; > r9 = page_virt
|
||||
|
||||
ExtendPool ; OUTSIDE REFERER
|
||||
mflr r14
|
||||
rlwinm r17, r8, 0, 0, 19
|
||||
|
||||
|
||||
; This segment will occupy a page
|
||||
|
||||
_pool_page_seg equ 0x1000
|
||||
|
||||
rlwinm r17, r8, 0, -(_pool_page_seg)
|
||||
|
||||
|
||||
; Counter can be viewed from Apple System Profiler
|
||||
|
||||
lwz r16, KDP.NanoKernelInfo + NKNanoKernelInfo.FreePoolExtendCount(r1)
|
||||
addi r16, r16, 1
|
||||
stw r16, KDP.NanoKernelInfo + NKNanoKernelInfo.FreePoolExtendCount(r1)
|
||||
|
||||
|
||||
; Bit of palaver
|
||||
|
||||
_log 'Extend free pool: phys 0x'
|
||||
mr r8, r17
|
||||
bl Printw
|
||||
@ -375,103 +457,164 @@ ExtendPool ; OUTSIDE REFERER
|
||||
mr r8, r16
|
||||
bl Printd
|
||||
_log '^n'
|
||||
li r16, 0x1000
|
||||
|
||||
|
||||
; Clear the page
|
||||
|
||||
li r16, _pool_page_seg
|
||||
@zeroloop
|
||||
subi r16, r16, 32
|
||||
cmpwi r16, 0
|
||||
dcbz r16, r17
|
||||
bgt+ @zeroloop
|
||||
|
||||
; Put the funny stuff in
|
||||
li r16, 0xfe8
|
||||
stw r16, 0x0000(r17)
|
||||
lisori r16, '‡BGN'
|
||||
stw r16, 0x0004(r17)
|
||||
addi r15, r17, 0x08
|
||||
li r16, 0xfe0
|
||||
stw r16, 0x0000(r15)
|
||||
lisori r16, '‡loc'
|
||||
stw r16, 0x0004(r15)
|
||||
addi r15, r17, 0xfe8
|
||||
lwz r18, -0x0aa0(r1)
|
||||
|
||||
; Begin block
|
||||
|
||||
li r16, _pool_page_seg - Block.kEndSize
|
||||
stw r16, Block.OffsetToNext(r17)
|
||||
|
||||
lisori r16, Block.kBeginSig
|
||||
stw r16, Block.Signature(r17)
|
||||
|
||||
|
||||
; Alloc block (_PoolAddBlockToFreeList will convert to Free)
|
||||
|
||||
addi r15, r17, Block.kBeginSize
|
||||
li r16, _pool_page_seg - Block.kEndSize - Block.kBeginSize
|
||||
stw r16, Block.OffsetToNext(r15)
|
||||
|
||||
lisori r16, Block.kAllocSig
|
||||
stw r16, Block.Signature(r15)
|
||||
|
||||
|
||||
; End block
|
||||
|
||||
addi r15, r17, _pool_page_seg - Block.kEndSize
|
||||
lwz r18, PSA.FirstPoolSeg(r1)
|
||||
subf r18, r15, r18
|
||||
stw r18, 0x0000(r15)
|
||||
lisori r16, '‡END'
|
||||
stw r16, 0x0004(r15)
|
||||
lwz r16, -0x0a9c(r1)
|
||||
stw r16, LLL.Next(r15)
|
||||
stw r18, Block.OffsetToNext(r15) ; point to next-most-recently-added segment
|
||||
|
||||
; Update globals
|
||||
stw r9, -0x0a9c(r1)
|
||||
stw r17, -0x0aa0(r1)
|
||||
lisori r16, Block.kEndSig
|
||||
stw r16, Block.Signature(r15)
|
||||
|
||||
lwz r16, PSA.FirstPoolSegLogical(r1) ; vestigial?
|
||||
stw r16, Block.LogiNextSeg(r15)
|
||||
|
||||
|
||||
; Add new segment to global singly linked list
|
||||
|
||||
stw r9, PSA.FirstPoolSegLogical(r1)
|
||||
stw r17, PSA.FirstPoolSeg(r1)
|
||||
|
||||
|
||||
; Free the Alloc block and add it to the global doubly linked list
|
||||
|
||||
addi r8, r17, Block.kBeginSize + Block.Data
|
||||
bl _PoolAddBlockToFreeList
|
||||
|
||||
|
||||
; This won't do anything, because there is no other free block in the segment
|
||||
|
||||
bl _PoolMergeAdjacentFreeBlocks
|
||||
|
||||
|
||||
; Return
|
||||
|
||||
; Unknown func calls
|
||||
addi r8, r17, 0x10
|
||||
bl major_0x129fc
|
||||
bl major_0x12a34
|
||||
mtlr r14
|
||||
blr
|
||||
|
||||
|
||||
|
||||
; major_0x12b94
|
||||
; Check the pool for corruption (dead code)
|
||||
|
||||
; Xrefs:
|
||||
; "HeapSegCorrupt"
|
||||
PoolCheck
|
||||
|
||||
mflr r19
|
||||
lwz r20, -0x0aa0(r1)
|
||||
lwz r20, PSA.FirstPoolSeg(r1)
|
||||
|
||||
major_0x12b94_0x8
|
||||
addi r8, r20, 0x08
|
||||
bl major_0x12b94_0x30
|
||||
lwz r17, 0x0000(r20)
|
||||
|
||||
; Check this segment, starting with first Allocated block
|
||||
|
||||
@next_segment
|
||||
addi r8, r20, Block.kBeginSize
|
||||
bl _PoolCheckBlocks
|
||||
|
||||
|
||||
; Get End block
|
||||
|
||||
lwz r17, Block.OffsetToNext(r20)
|
||||
add r17, r17, r20
|
||||
lwz r18, 0x0000(r17)
|
||||
cmpwi r18, 0x00
|
||||
|
||||
|
||||
; Use that to get another Begin block
|
||||
|
||||
lwz r18, Block.OffsetToNext(r17)
|
||||
cmpwi r18, 0
|
||||
add r20, r18, r17
|
||||
bne+ major_0x12b94_0x8
|
||||
bne+ @next_segment
|
||||
|
||||
|
||||
; If there are no more Begins, we are done
|
||||
|
||||
mtlr r19
|
||||
blr
|
||||
|
||||
major_0x12b94_0x30
|
||||
|
||||
|
||||
; Only called by the above function
|
||||
; Called on data ptrs? Or on block ptrs?
|
||||
|
||||
; ARG ptr r8
|
||||
|
||||
_PoolCheckBlocks
|
||||
|
||||
mflr r14
|
||||
addi r16, r8, -0x08
|
||||
subi r16, r8, 8 ; Block.kBeginSize or Block.Data?
|
||||
|
||||
major_0x12b94_0x38
|
||||
lwz r17, 0x0004(r16)
|
||||
lis r18, -0x78bb
|
||||
ori r18, r18, 0x4e44
|
||||
cmpw r17, r18
|
||||
li r9, 0x00
|
||||
beq- major_0x12b94_0x1a4
|
||||
lis r18, -0x7894
|
||||
ori r18, r18, 0x6f63
|
||||
cmpw r17, r18
|
||||
beq- major_0x12b94_0x94
|
||||
lis r18, 0x6672
|
||||
ori r18, r18, 0x6565
|
||||
li r9, 0x04
|
||||
cmpw r17, r18
|
||||
bne- major_0x12b94_0xa8
|
||||
lwz r17, 0x000c(r16)
|
||||
cmpwi r17, 0x00
|
||||
li r9, 0x05
|
||||
beq- major_0x12b94_0xa8
|
||||
lwz r17, LLL.Next(r16)
|
||||
cmpwi r17, 0x00
|
||||
li r9, 0x06
|
||||
beq- major_0x12b94_0xa8
|
||||
@loop
|
||||
lwz r17, Block.Signature(r16)
|
||||
|
||||
major_0x12b94_0x94
|
||||
lwz r17, 0x0000(r16)
|
||||
lisori r18, Block.kEndSig
|
||||
cmpw r17, r18
|
||||
li r9, 0
|
||||
beq- @return
|
||||
|
||||
lisori r18, Block.kAllocSig
|
||||
cmpw r17, r18
|
||||
beq- @block_is_allocated
|
||||
|
||||
lisori r18, Block.kFreeSig
|
||||
li r9, 4
|
||||
cmpw r17, r18
|
||||
bne- @block_corrupt
|
||||
|
||||
; From now we assume Free
|
||||
lwz r17, Block.FreePrev(r16)
|
||||
cmpwi r17, 0
|
||||
li r9, 5
|
||||
beq- @block_corrupt
|
||||
|
||||
lwz r17, Block.FreeNext(r16)
|
||||
cmpwi r17, 0
|
||||
li r9, 6
|
||||
beq- @block_corrupt
|
||||
|
||||
@block_is_allocated
|
||||
;or block is free (fallthru)
|
||||
lwz r17, Block.OffsetToNext(r16)
|
||||
add r16, r16, r17
|
||||
cmpwi r17, 0x00
|
||||
li r9, 0x07
|
||||
bgt+ major_0x12b94_0x38
|
||||
cmpwi r17, 0
|
||||
li r9, 7
|
||||
bgt+ @loop
|
||||
|
||||
major_0x12b94_0xa8
|
||||
|
||||
; 4: neither Allocated nor Free
|
||||
; 5: Free with bad FreePrev ptr
|
||||
; 6: Free with bad FreeNext ptr
|
||||
; 7: bad OffsetToNext ptr
|
||||
|
||||
@block_corrupt
|
||||
mr r18, r8
|
||||
_log 'Heap segment corrupt '
|
||||
mr r8, r9
|
||||
@ -480,42 +623,56 @@ major_0x12b94_0xa8
|
||||
mr r8, r16
|
||||
bl Printw
|
||||
_log '^n'
|
||||
addi r16, r16, -0x40
|
||||
li r17, 0x08
|
||||
|
||||
major_0x12b94_0x10c
|
||||
|
||||
; Dump some memory
|
||||
|
||||
subi r16, r16, 64
|
||||
li r17, 8 ; 8 lines, 16 bytes each
|
||||
|
||||
@dump_next_line
|
||||
mr r8, r16
|
||||
bl Printw
|
||||
|
||||
_log ' '
|
||||
lwz r8, 0x0000(r16)
|
||||
|
||||
lwz r8, 0(r16)
|
||||
bl Printw
|
||||
lwz r8, 0x0004(r16)
|
||||
lwz r8, 4(r16)
|
||||
bl Printw
|
||||
lwz r8, LLL.Next(r16)
|
||||
lwz r8, 8(r16)
|
||||
bl Printw
|
||||
lwz r8, 0x000c(r16)
|
||||
lwz r8, 12(r16)
|
||||
bl Printw
|
||||
|
||||
_log ' *'
|
||||
li r8, 0x10
|
||||
addi r16, r16, -0x01
|
||||
|
||||
li r8, 16
|
||||
subi r16, r16, 1
|
||||
mtctr r8
|
||||
|
||||
major_0x12b94_0x164
|
||||
lbzu r8, 0x0001(r16)
|
||||
cmpwi r8, 0x20
|
||||
bgt- major_0x12b94_0x174
|
||||
li r8, 0x20
|
||||
@dump_next_char
|
||||
lbzu r8, 1(r16)
|
||||
|
||||
cmpwi r8, ' '
|
||||
bgt- @dont_use_space
|
||||
li r8, ' '
|
||||
@dont_use_space
|
||||
|
||||
major_0x12b94_0x174
|
||||
bl Printc
|
||||
bdnz+ major_0x12b94_0x164
|
||||
bdnz+ @dump_next_char
|
||||
|
||||
_log '*^n'
|
||||
addi r17, r17, -0x01
|
||||
addi r16, r16, 0x01
|
||||
|
||||
subi r17, r17, 1
|
||||
addi r16, r16, 1
|
||||
cmpwi r17, 0x00
|
||||
bne+ major_0x12b94_0x10c
|
||||
bne+ @dump_next_line
|
||||
|
||||
|
||||
mr r8, r18
|
||||
|
||||
major_0x12b94_0x1a4
|
||||
|
||||
@return
|
||||
mtlr r14
|
||||
blr
|
||||
|
||||
@ -184,7 +184,7 @@ MPCall_103_0x1fc
|
||||
b MPCall_103_0x1a4
|
||||
|
||||
MPCall_103_0x204
|
||||
lwz r16, -0x0aa0(r1)
|
||||
lwz r16, PSA.FirstPoolSeg(r1)
|
||||
|
||||
MPCall_103_0x208
|
||||
lwz r31, 0x0000(r16)
|
||||
@ -432,7 +432,7 @@ CoherenceFunc_0x80
|
||||
add r24, r24, r9
|
||||
li r9, 0x00
|
||||
li r14, 0x00
|
||||
lwz r16, -0x0aa0(r1)
|
||||
lwz r16, PSA.FirstPoolSeg(r1)
|
||||
|
||||
CoherenceFunc_0xa8
|
||||
lwz r17, 0x0000(r16)
|
||||
|
||||
@ -23,7 +23,7 @@
|
||||
MPCreateQueue
|
||||
|
||||
li r8, Queue.Size
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
mr. r31, r8
|
||||
beq+ ScrambleMPCall
|
||||
|
||||
@ -238,7 +238,7 @@ MPSetQueueReserve
|
||||
@make_more
|
||||
@alloc_loop
|
||||
li r8, Message.Size
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
cmpwi r8, 0
|
||||
beq+ ReleaseAndScrambleMPCall
|
||||
|
||||
@ -292,7 +292,7 @@ MPNotifyQueue
|
||||
bne- @try_reserve
|
||||
|
||||
;no reservation available
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
|
||||
cmpwi r8, 0
|
||||
beq+ ReleaseAndScrambleMPCall
|
||||
@ -617,7 +617,7 @@ MPCreateSemaphore
|
||||
bgt+ ReturnMPCallOOM
|
||||
|
||||
li r8, Semaphore.Size
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
mr. r31, r8
|
||||
beq+ ScrambleMPCall
|
||||
|
||||
@ -977,7 +977,7 @@ MPCall_21_0x98
|
||||
|
||||
MPCreateCriticalRegion
|
||||
li r8, 0x24
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
mr. r31, r8
|
||||
beq+ ScrambleMPCall
|
||||
InitList r31, CriticalRegion.kSignature, scratch=r16
|
||||
@ -1364,7 +1364,7 @@ MPCall_26_0x98
|
||||
MPCreateEvent
|
||||
|
||||
li r8, EventGroup.Size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
mr. r31, r8
|
||||
beq+ ScrambleMPCall
|
||||
|
||||
@ -1908,7 +1908,7 @@ NKCreateTimer ; OUTSIDE REFERER
|
||||
|
||||
; r1 = kdp
|
||||
; r8 = size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
; r8 = ptr
|
||||
|
||||
mr. r31, r8
|
||||
@ -2110,7 +2110,7 @@ MPArmTimer
|
||||
cmpwi r9, 0
|
||||
bne- @already_got_notr
|
||||
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
mr. r30, r8
|
||||
beq+ ReleaseAndScrambleMPCall
|
||||
|
||||
@ -2248,7 +2248,7 @@ MPCancelTimer
|
||||
|
||||
MPCreateNotification
|
||||
li r8, Notification.Size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
mr. r31, r8
|
||||
beq+ ScrambleMPCall
|
||||
|
||||
@ -2388,7 +2388,7 @@ CauseNotification
|
||||
|
||||
@no_notr ; ... allocate message anew
|
||||
li r8, Message.Size
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
cmpwi r8, 0
|
||||
beq- @fail_unknown_err
|
||||
|
||||
|
||||
@ -95,7 +95,7 @@ CreateTask
|
||||
; Create the 1k TASK struct in the pool and give it an ID, leave ptr in r28
|
||||
|
||||
li r8, 0x400 ;Task.Size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
mr. r28, r8
|
||||
beq- @fail_oom
|
||||
|
||||
@ -120,7 +120,7 @@ CreateTask
|
||||
; Create a subordinate notification struct -- NOPENOPENOPE
|
||||
|
||||
li r8, 0x1c ;Notification.Size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
cmpwi r8, 0
|
||||
stw r8, Task.NotificationPtr(r28)
|
||||
beq- @fail_note_oom
|
||||
@ -170,7 +170,7 @@ CreateTask
|
||||
|
||||
; Allocate and check
|
||||
li r8, 0x214 ;VectorSaveArea.Size ; room for v registers plus 20 bytes
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
andi. r9, r8, 16-1 ; Sanity check: aligned to size of vector register?
|
||||
cmpwi cr1, r8, 0
|
||||
bne+ Local_Panic
|
||||
@ -755,7 +755,7 @@ MPCall_58_0x44
|
||||
lwz r30, 0x0088(r31)
|
||||
bc BO_IF_NOT, 31, MPCall_58_0x68
|
||||
li r8, 0x1c
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
cmpwi r8, 0x00
|
||||
beq+ ReleaseAndScrambleMPCall
|
||||
li r3, 0x00
|
||||
@ -805,7 +805,7 @@ FuncExportedFromTasks ; OUTSIDE REFERER
|
||||
stw r16, 0x0000(r17)
|
||||
InsertAsPrev r17, r16, scratch=r18
|
||||
li r8, 0x1c
|
||||
bl PoolAlloc_with_crset
|
||||
bl PoolAlloc
|
||||
lwz r29, Task.Flags(r31)
|
||||
_bset r29, r29, 22
|
||||
|
||||
|
||||
@ -34,7 +34,7 @@ InitTMRQs ; OUTSIDE REFERER
|
||||
|
||||
; r1 = kdp
|
||||
; r8 = size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
; r8 = ptr
|
||||
|
||||
mr. r31, r8
|
||||
@ -55,7 +55,7 @@ InitTMRQs_0x7c
|
||||
|
||||
; r1 = kdp
|
||||
; r8 = size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
; r8 = ptr
|
||||
|
||||
mr. r31, r8
|
||||
@ -88,7 +88,7 @@ InitTMRQs_0xb4
|
||||
mflr r30
|
||||
|
||||
li r8, Timer.Size
|
||||
bl PoolAlloc ; one of those weird queue structures
|
||||
bl PoolAllocClear ; one of those weird queue structures
|
||||
mr. r31, r8
|
||||
beq+ Local_Panic
|
||||
|
||||
|
||||
@ -1571,7 +1571,7 @@ VMAllocateMemory_0x1a4
|
||||
|
||||
; r1 = kdp
|
||||
; r8 = size
|
||||
bl PoolAlloc
|
||||
bl PoolAllocClear
|
||||
; r8 = ptr
|
||||
|
||||
mr. r31, r8
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user