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https://github.com/open-goal/jak-project
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112 lines
3.1 KiB
Common Lisp
112 lines
3.1 KiB
Common Lisp
;;-*-Lisp-*-
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(in-package goal)
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;; name: timer-h.gc
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;; name in dgo: timer-h
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;; dgos: ENGINE, GAME
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;; There are two sources for timing:
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;; - EE TIMER1, used for the frame profiler. There are 9765 counts of this per frame. It gets reset in drawable.
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;; - The "stopwatch" system, used for reading the CPU clock cycle counter, at 300 MHz (32-bit)
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;; The Emotion Engine has 4 hardware timers, timer1 is used as the
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(defconstant TIMER0_BANK #x10000000) ;; has HOLD register!
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(defconstant TIMER1_BANK #x10000800) ;; has HOLD register!
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(defconstant TIMER2_BANK #x10001000) ;; does NOT have HOLD register!
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(defconstant TIMER3_BANK #x10001800) ;; does NOT have HOLD register!
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; PC Port Timer
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defmacro get-cpu-clock ()
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"Read the 300 MHz clock."
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;; __read-ee-timer is a 300 MHz timer from the C Kernel.
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;; it's a real timer.
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`(the uint (logand #xffffffff (__read-ee-timer)))
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)
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(defmacro get-bus-clock/256 ()
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"Read the 150 MHz / 256 clock."
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;; 300 MHz / (2^9)
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`(the uint (logand #xffffffff (shr (__read-ee-timer) 9)))
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)
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(#when PC_PORT
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;; the bus clock can be reset, which just stores the current count here.
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(define *timer-reset-value* (the uint 0))
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)
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Timer HW
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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(defenum timer-clock-selection
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:type uint8
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(busclk 0)
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(busclk/16 1)
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(busclk/256 2)
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(hblank 3)
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)
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(deftype timer-mode (uint32)
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((clks timer-clock-selection :offset 0 :size 2)
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(gate uint8 :offset 2 :size 1)
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(gats uint8 :offset 3 :size 1)
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(gatm uint8 :offset 4 :size 2)
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(zret uint8 :offset 6 :size 1)
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(cue uint8 :offset 7 :size 1)
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(cmpe uint8 :offset 8 :size 1)
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(ovfe uint8 :offset 9 :size 1)
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(equf uint8 :offset 10 :size 1)
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(ovff uint8 :offset 11 :size 1)
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)
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:method-count-assert 9
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:size-assert #x4
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:flag-assert #x900000004
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)
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(deftype timer-bank (structure)
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((count uint32 :offset-assert 0)
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(mode timer-mode :offset 16)
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(comp uint32 :offset 32)
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)
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:method-count-assert 9
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:size-assert #x24
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:flag-assert #x900000024
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)
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(deftype timer-hold-bank (timer-bank)
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((hold uint32 :offset 48)
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)
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:method-count-assert 9
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:size-assert #x34
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:flag-assert #x900000034
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)
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(deftype stopwatch (basic)
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((prev-time-elapsed time-frame :offset-assert 8)
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(start-time time-frame :offset-assert 16)
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(begin-level int32 :offset-assert 24)
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)
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:method-count-assert 9
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:size-assert #x1c
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:flag-assert #x90000001c
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)
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(define *ticks-per-frame* 9765)
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(defun timer-init ((arg0 timer-bank) (arg1 timer-mode))
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(set! (-> arg0 mode) arg1)
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(set! (-> arg0 count) (the-as uint 0))
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0
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)
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(#unless PC_PORT
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(timer-init
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(the-as timer-bank #x10000800)
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(new 'static 'timer-mode :clks (timer-clock-selection busclk/256) :cue #x1)
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)
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)
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