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https://github.com/open-goal/jak-project
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water111
637990314b
Closes #736 --------- Co-authored-by: Hat Kid <6624576+Hat-Kid@users.noreply.github.com>
273 lines
14 KiB
Common Lisp
273 lines
14 KiB
Common Lisp
;;-*-Lisp-*-
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(in-package goal)
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(bundles "ENGINE.CGO" "GAME.CGO")
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(require "engine/dma/dma.gc")
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;; DECOMP BEGINS
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;; DMA buffers store data to be sent over DMA.
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;; They are a very simple wrapper around the data.
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;; Typically a dma-buffer will store dma-buckets or other more complicated data structures.
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;; The main display list uses a "chain transfer". In this mode, the DMA system reads dma-tags which
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;; tell it what to transfer next. This can be used to construct linked lists of DMA data.
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;; If the DMA is configured correctly, it is possible to make the first quadword contain
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;; both a dma-tag and a tag for the peripheral. This allows you to have a single quadword
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;; tag that controls both the DMA and peripheral. We call these a "dma-packet" for some reason.
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;; Ex:
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; 32-bit vifcode ;; 32-bit vifcode ;; 64-bit dma-tag ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; in this case, the vifcodes will be sent to the vif, if
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;; the dma transfer has tte set.
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;; note that the second vifcode can also hold other stuff depending on the mode.
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;; A dma-tag plus two vif-tags in a single quadword.
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;; Most DMA stuff goes directly to the VIF, so this is the
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;; most common.
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(deftype dma-packet (structure)
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((dma dma-tag)
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(vif0 vif-tag)
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(vif1 vif-tag)
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(quad uint128 :overlay-at dma)))
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;; seems to be unused? Also, it seems to be broken. Do not use this.
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(deftype dma-packet-array (inline-array-class) ())
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(set! (-> dma-packet-array heap-base) (the-as uint 16))
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;; For doing a dma -> vif -> gif (path 2) transfer.
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(deftype dma-gif-packet (structure)
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((dma-vif dma-packet :inline)
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(gif uint64 2)
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;; these two were added to make it easier.
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(gif0 uint64 :overlay-at (-> gif 0))
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(gif1 uint64 :overlay-at (-> gif 1))
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(quad uint128 2 :overlay-at (-> dma-vif dma))))
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;; dma-buffer is a dynamically sized container for storing DMA data.
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;; It seems like this was not actually implemented as a proper dynamic type.
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;; I added a data-buffer field that overlaps with data to get at the array of
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;; bytes more easily.
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(deftype dma-buffer (basic)
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((allocated-length int32) ;; number of bytes.
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(base pointer) ;; first unused memory.
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(end pointer) ;; ?? unused ??
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(data uint64 1) ;; start of memory.
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(data-buffer uint8 :dynamic :overlay-at (-> data 0)) ;; the actual dynamic array backing it.
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)
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(:methods
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(new (symbol type int) _type_)))
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(defmethod new dma-buffer ((allocation symbol) (type-to-make type) (arg0 int))
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"Create a new dma-buffer with enough room to store arg0 bytes.
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Note that this does not set the end field."
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(let ((v0-0 (object-new allocation type-to-make (+ arg0 -4 (-> type-to-make size)))))
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(set! (-> v0-0 base) (-> v0-0 data))
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(set! (-> v0-0 allocated-length) arg0)
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v0-0))
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(defun dma-buffer-inplace-new ((arg0 dma-buffer) (arg1 int))
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"Create a dma-buffer in-place. Does not set the type of the dma-buffer object."
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(set! (-> arg0 base) (-> arg0 data))
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(set! (-> arg0 allocated-length) arg1)
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arg0)
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(defmethod length ((this dma-buffer))
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"Get the amount of data the buffer can hold, in bytes."
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(-> this allocated-length))
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(defmethod asize-of ((this dma-buffer))
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"Get the size in memory of the object"
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(+ (-> this allocated-length) -4 (-> dma-buffer size)))
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(defun dma-buffer-length ((arg0 dma-buffer))
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"Get length used in quadwords, rounded down"
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(shr (+ (&- (-> arg0 base) (the-as uint (-> arg0 data))) 15) 4))
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(defun dma-buffer-free ((arg0 dma-buffer))
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"Get the number of free quadwords, rounded down, between base and end pointers."
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(shr (+ (&- (-> arg0 end) (the-as uint (-> arg0 base))) 15) 4))
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(defmacro dma-buffer-add-base-type (buf pkt dma-type &rest body)
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"Base macro for adding stuff to a dma-buffer. Don't use this directly!"
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(with-gensyms (dma-buf)
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`(let* ((,dma-buf ,buf)
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(,pkt (the-as ,dma-type (-> ,dma-buf base))))
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,@body
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(set! (-> ,dma-buf base) (&+ (the-as pointer ,pkt) (size-of ,dma-type))))))
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(defmacro dma-buffer-add-base-data (buf data-type forms)
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"Base macro for adding data words to a dma-buffer.
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Each form in forms is converted into data-type and added to the buffer. NO TYPE CHECKING is performed, so be careful!"
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(with-gensyms (dma-buf ptr)
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`(let* ((,dma-buf ,buf)
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(,ptr (the-as (pointer ,data-type) (-> ,dma-buf base))))
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,@(apply-i (lambda (x i) `(set! (-> ,ptr ,i) (the-as ,data-type ,x))) forms)
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(set! (-> ,dma-buf base) (&+ (the-as pointer ,ptr) (* ,(length forms) (size-of ,data-type)))))))
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(defmacro dma-buffer-add-cnt-vif2 (buf qwc vif0 vif1)
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"Add a dma-packet to a dma-buffer.
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The packet is made up of a 'cnt' DMAtag (transfer qwc qwords of data after the tag and continue from after that point)
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and includes two vif-tags for vifcode, or something else if needed."
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(with-gensyms (pkt)
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`(dma-buffer-add-base-type ,buf
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,pkt
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dma-packet
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(set! (-> ,pkt dma) (new 'static 'dma-tag :id (dma-tag-id cnt) :qwc ,qwc))
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(set! (-> ,pkt vif0) ,vif0)
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(set! (-> ,pkt vif1) ,vif1))))
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(defmacro dma-buffer-add-ref-vif2 (buf qwc addr vif0 vif1)
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"Add a dma-packet to a dma-buffer.
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The packet is made up of a 'cnt' DMAtag (transfer qwc qwords of data at addr and continue from after the tag)
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and includes two vif-tags for vifcode, or something else if needed."
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(with-gensyms (pkt)
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`(dma-buffer-add-base-type ,buf
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,pkt
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dma-packet
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(set! (-> ,pkt dma) (new 'static 'dma-tag :id (dma-tag-id ref) :qwc ,qwc :addr (the-as int ,addr)))
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(set! (-> ,pkt vif0) ,vif0)
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(set! (-> ,pkt vif1) ,vif1))))
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(defmacro dma-buffer-add-ret (buf)
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"Add a dma-packet to a dma-buffer. This packet simply does a DMA 'return' "
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(with-gensyms (pkt)
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`(dma-buffer-add-base-type ,buf
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,pkt
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dma-packet
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(set! (-> ,pkt dma) (new 'static 'dma-tag :id (dma-tag-id ret) :qwc 0))
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(set! (-> ,pkt vif0) (new 'static 'vif-tag :cmd (vif-cmd nop)))
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(set! (-> ,pkt vif1) (new 'static 'vif-tag :cmd (vif-cmd nop))))))
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(defmacro dma-buffer-add-gif-tag (buf giftag gifregs)
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"Add a giftag to a dma-buffer."
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(with-gensyms (pkt)
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`(dma-buffer-add-base-type ,buf ,pkt gs-gif-tag (set! (-> ,pkt tag) ,giftag) (set! (-> ,pkt regs) ,gifregs))))
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(defmacro dma-buffer-add-uint64 (buf &rest body)
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"Add 64-bit words to a dma-buffer. See dma-buffer-add-base-data"
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`(dma-buffer-add-base-data ,buf uint64 ,body))
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(defmacro dma-buffer-add-uint128 (buf &rest body)
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"Add 128-bit words to a dma-buffer. See dma-buffer-add-base-data"
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`(dma-buffer-add-base-data ,buf uint128 ,body))
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(defun dma-buffer-add-vu-function ((dma-buf dma-buffer) (vu-func vu-function) (flush-path-3 int))
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"Add DMA tags to load the given VU function. The destination in vu instruction memory
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is specific inside the vu-function. This does NOT copy the vu-function into the buffer,
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but creates a reference to the existing VU function."
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;; The first 4 bytes of a vu-function object's data are discarded because they aren't aligned.
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(let ((func-ptr (the-as pointer (&-> vu-func data 4)))
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;; og:preserve-this we rely on the vu functions being empty on pc
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(qlen (#if PC_PORT 0 (-> vu-func qlength))) ;; number of quadwords
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(origin (-> vu-func origin)) ;; destination address in VU instruction memory.
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)
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;; loop until whole program is transferred.
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(while (> qlen 0)
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;; transfer up to 127 quadwords at a single time.
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(let ((qwc-now (min 127 qlen)))
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;; Set up DMA to transfer the data from the vu-function
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;; ref id = reference to data outside of the buffer.
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(dma-buffer-add-ref-vif2 dma-buf
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qwc-now
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func-ptr
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;; Set up first vifcode as a flush.
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(new 'static 'vif-tag :cmd (if (zero? flush-path-3) (vif-cmd flushe) (vif-cmd flusha)))
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;; next vifcode, transfer microprogram. This is in 64-bit units (VU instructions)
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(new 'static 'vif-tag :cmd (vif-cmd mpg) :num (shl qwc-now 1) :imm origin))
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;; increment by qwc-now quadwords.
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(&+! func-ptr (* qwc-now 16))
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(set! qlen (- qlen qwc-now))
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(+! origin (* qwc-now 2)))))
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#f)
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(defun dma-buffer-send ((chan dma-bank) (buf dma-buffer))
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"Send the DMA buffer! DOES NOT TRANSFER TAG, you probably want dma-buffer-send-chain instead."
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(when (< (-> buf allocated-length) (&- (-> buf base) (-> buf data)))
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;; oops. we overflowed the DMA buffer. die.
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(segfault))
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(dma-send chan (the-as uint (-> buf data)) (the-as uint (dma-buffer-length buf))))
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(defun dma-buffer-send-chain ((chan dma-bank-source) (buf dma-buffer))
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"Send the DMA buffer! Sends the tags"
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(when (< (-> buf allocated-length) (&- (-> buf base) (-> buf data)))
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;; oops. we overflowed the DMA buffer. die.
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(segfault))
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(dma-send-chain chan (the-as uint (-> buf data))))
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(defmacro with-cnt-vif-block (bindings &rest body)
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"Start a cnt w/ vif direct to gif dma packet setup for the dma-buffer in bindings.
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With this, you can transfer data through PATH2 without having to setup the tag yourself.
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The qwc of the transfer is determined at runtime at the end of this block."
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(let ((buf (first bindings)))
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(with-gensyms (buf-start buf-qwc)
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`(let ((,buf-start (-> ,buf base)))
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;; setup the dmatag for PATH2 transfer, qwc is 0 (patched later)
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(dma-buffer-add-cnt-vif2 ,buf 0 (new 'static 'vif-tag :cmd (vif-cmd nop)) (new 'static 'vif-tag :cmd (vif-cmd direct)))
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;; things with this buffer!
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,@body
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;; patch qwc! just do the difference between the current ptr and the old one and turn it into qwords.
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;; we take one qword out because it's the initial dmatag which isnt part of the count.
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;; this rounds *down*, so make sure to fill the buffer in 128-bit boundaries.
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(let ((,buf-qwc (/ (+ (&- -16 ,buf-start) (the int (-> ,buf base))) 16)))
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(cond
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((nonzero? ,buf-qwc) ;; stuff was added to the buffer
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;; patch the DMA tag
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(logior! (-> (the-as (pointer dma-tag) ,buf-start) 0) (the-as uint (new 'static 'dma-tag :qwc ,buf-qwc)))
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;; patch the 2nd vifcode's imm field (qwc)
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(logior! (-> (the-as (pointer dma-tag) ,buf-start) 1) (the-as uint (shl (shr (shl ,buf-qwc 48) 48) 32))))
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(else ;; nothing was added to the buffer. delete the dmatag, you cannot transfer 0 qwords.
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(set! (-> ,buf base) ,buf-start))))))))
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(defmacro with-cnt-vif-block-qwc (bindings &rest body)
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"Start a cnt w/ vif direct to gif dma packet setup for the dma-buffer in bindings.
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With this, you can transfer data through PATH2 without having to setup the tag yourself.
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The qwc of the transfer is determined at runtime at the end of this block.
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WARNING: You MUST guarantee that the resulting qwc is NOT zero!"
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(let ((buf (first bindings)))
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(with-gensyms (buf-start buf-qwc)
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`(let ((,buf-start (the-as dma-packet (-> ,buf base))))
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;; dmatag will be added at the end so we reserve
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(&+! (-> ,buf base) 16)
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;; setup the dmatag for PATH2 transfer, qwc is 0 (patched later)
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(dma-buffer-add-cnt-vif2 ,buf 0 (new 'static 'vif-tag :cmd (vif-cmd nop)) (new 'static 'vif-tag :cmd (vif-cmd direct)))
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;; things with this buffer!
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,@body
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;; we make the dmatag now! its at the start.
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(let ((,buf-qwc (/ (+ (- -16 (the-as int ,buf-start)) (the-as int (-> ,buf base))) 16)))
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(set! (-> ,buf-start dma) (new 'static 'dma-tag :id (dma-tag-id cnt) :qwc ,buf-qwc))
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(set! (-> ,buf-start vif0) (new 'static 'vif-tag))
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(set! (-> ,buf-start vif1) (new 'static 'vif-tag :cmd (vif-cmd direct) :msk #x1 :imm ,buf-qwc)))))))
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(defmacro with-dma-bucket (bindings &rest body)
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"Start a new dma-bucket in body that will be finished at the end.
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The bindings are the dma-buffer, dma-bucket and bucket-id respectively."
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(let ((buf (first bindings))
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(bucket (second bindings))
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(bucket-id (third bindings)))
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(with-gensyms (buf-start bucket-edge pkt)
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`(let ((,buf-start (-> ,buf base)))
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,@body
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;; we end the chain with a next. The bucket system will patch the next chain to this,
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;; and then patch all the buckets togehter before sending the DMA.
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(let ((,bucket-edge (the (pointer dma-tag) (-> ,buf base))))
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(let ((,pkt (the-as dma-packet (-> ,buf base))))
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(set! (-> ,pkt dma) (new 'static 'dma-tag :id (dma-tag-id next)))
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(set! (-> ,pkt vif0) (new 'static 'vif-tag :cmd (vif-cmd nop)))
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(set! (-> ,pkt vif1) (new 'static 'vif-tag :cmd (vif-cmd nop)))
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(set! (-> ,buf base) (&+ (the-as pointer ,pkt) (size-of dma-packet))))
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(dma-bucket-insert-tag ,bucket
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,bucket-id
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,buf-start ;; the first thing in this chain, bucket will patch previous to this
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,bucket-edge ;; end of this chain (ptr to next tag)
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))))))
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(defmacro with-dma-buffer-add-bucket (bindings &key (bucket-group (-> (current-frame) bucket-group)) &rest body)
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"Bind a dma-buffer to a variable and use it on a block to allow adding things to a new bucket.
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usage: (with-dma-buffer-add-bucket ((buffer-name buffer) bucket-id) &rest body)
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example: (with-dma-buffer-add-bucket ((buf (-> (current-frame) debug-buf)) (bucket-id debug-no-zbuf)) ...)"
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`(let ((,(caar bindings) ,(cadar bindings))) (with-dma-bucket (,(caar bindings) ,bucket-group ,(cadr bindings)) ,@body)))
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