2022-06-30 01:22:51 -04:00
|
|
|
;;-*-Lisp-*-
|
|
|
|
(in-package goal)
|
|
|
|
|
|
|
|
;; name: timer-h.gc
|
|
|
|
;; name in dgo: timer-h
|
|
|
|
;; dgos: ENGINE, GAME
|
|
|
|
|
2023-02-27 18:58:01 -05:00
|
|
|
#|@file
|
|
|
|
There are two sources for timing:
|
|
|
|
- EE TIMER1, used for the frame profiler. There are 9765 counts of this per frame. It gets reset in drawable.
|
|
|
|
- The "stopwatch" system, used for reading the CPU clock cycle counter, at 300 MHz (32-bit)
|
|
|
|
|#
|
2022-08-05 16:12:54 -04:00
|
|
|
|
2023-02-27 18:58:01 -05:00
|
|
|
;; DECOMP BEGINS
|
2022-08-24 00:29:51 -04:00
|
|
|
|
|
|
|
;; The Emotion Engine has 4 hardware timers, timer1 is used as the
|
|
|
|
(defconstant TIMER0_BANK (the timer-bank #x10000000)) ;; has HOLD register!
|
|
|
|
(defconstant TIMER1_BANK (the timer-bank #x10000800)) ;; has HOLD register!
|
|
|
|
(defconstant TIMER2_BANK (the timer-bank #x10001000)) ;; does NOT have HOLD register!
|
|
|
|
(defconstant TIMER3_BANK (the timer-bank #x10001800)) ;; does NOT have HOLD register!
|
|
|
|
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;; PC Port Timer
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(defmacro get-cpu-clock ()
|
|
|
|
"Read the 300 MHz clock."
|
|
|
|
;; __read-ee-timer is a 300 MHz timer from the C Kernel.
|
|
|
|
;; it's a real timer.
|
|
|
|
`(the uint (logand #xffffffff (__read-ee-timer)))
|
|
|
|
)
|
|
|
|
|
|
|
|
(defmacro get-bus-clock/256 ()
|
|
|
|
"Read the 150 MHz / 256 clock."
|
|
|
|
;; 300 MHz / (2^9)
|
|
|
|
`(the uint (logand #xffffffff (shr (__read-ee-timer) 9)))
|
|
|
|
)
|
|
|
|
|
|
|
|
(#when PC_PORT
|
|
|
|
;; the bus clock can be reset, which just stores the current count here.
|
|
|
|
(define *timer-reset-value* (the uint 0))
|
|
|
|
)
|
|
|
|
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
;; Timer HW
|
|
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
(defenum timer-clock-selection
|
|
|
|
:type uint8
|
|
|
|
(busclk 0)
|
|
|
|
(busclk/16 1)
|
|
|
|
(busclk/256 2)
|
|
|
|
(hblank 3)
|
|
|
|
)
|
|
|
|
|
|
|
|
;; this matches the Tn_MODE register structure of the ps2 EE timers.
|
|
|
|
;; Only the lower 32 bits of these registers are usable, and the upper 16 hardwired to zero
|
|
|
|
(deftype timer-mode (uint32)
|
|
|
|
((clks timer-clock-selection :offset 0 :size 2)
|
|
|
|
(gate uint8 :offset 2 :size 1) ;; gate function enable
|
|
|
|
(gats uint8 :offset 3 :size 1) ;; gate selection: 0 = hblank, 1 = vblank
|
|
|
|
;; gate mode:
|
|
|
|
;; 0: count while gate signal is low
|
|
|
|
;; 1: start when gate signal rises
|
|
|
|
;; 2: start when gate signal falls
|
|
|
|
;; 3: start when gate signal rises/falls
|
|
|
|
(gatm uint8 :offset 4 :size 2)
|
|
|
|
(zret uint8 :offset 6 :size 1) ;; zero return: clear counter when equal to reference value
|
|
|
|
(cue uint8 :offset 7 :size 1) ;; count-up enable
|
|
|
|
(cmpe uint8 :offset 8 :size 1) ;; compare-interrupt enable
|
|
|
|
(ovfe uint8 :offset 9 :size 1) ;; overflow-interrupt enable
|
|
|
|
(equf uint8 :offset 10 :size 1) ;; equal-flag
|
|
|
|
(ovff uint8 :offset 11 :size 1) ;; overflow-flag
|
|
|
|
)
|
|
|
|
)
|
|
|
|
|
|
|
|
;; this matches an EE timer (without a HOLD register, timers 2 and 3)
|
|
|
|
;; Each register is 128-bits wide, but only the lower 32-bits are usable, and the upper
|
|
|
|
;; 16-bits of that are hardwired to zero.
|
|
|
|
(deftype timer-bank (structure)
|
2023-10-29 23:20:02 -04:00
|
|
|
((count uint32)
|
|
|
|
(mode timer-mode :offset 16)
|
|
|
|
(comp uint32 :offset 32)
|
2022-08-24 00:29:51 -04:00
|
|
|
)
|
|
|
|
)
|
|
|
|
|
|
|
|
;; this matches an EE timer (with a HOLD register, timers 0 and 1)
|
|
|
|
(deftype timer-hold-bank (timer-bank)
|
2023-10-29 23:20:02 -04:00
|
|
|
((hold uint32 :offset 48)
|
2022-08-24 00:29:51 -04:00
|
|
|
)
|
|
|
|
)
|
|
|
|
|
|
|
|
;; stopwatches are used to measure CPU clock cycles
|
|
|
|
;; they don't use the timer above, but instead the Count COP0 register
|
|
|
|
;; which counts CPU clock cycles directly
|
|
|
|
(deftype stopwatch (basic)
|
2023-10-29 23:20:02 -04:00
|
|
|
((prev-time-elapsed time-frame)
|
|
|
|
(start-time time-frame)
|
|
|
|
(begin-level int32)
|
2022-08-24 00:29:51 -04:00
|
|
|
)
|
|
|
|
)
|
|
|
|
|
|
|
|
;; Confusing! What IS this measuring exactly? Hmm...
|
|
|
|
;; this is set by default for NTSC, it will later be changed if PAL.
|
|
|
|
(define *ticks-per-frame* (/ 2500000 256)) ;; 2 500 000 / 256 = 9765
|
|
|
|
|
|
|
|
(defun timer-init ((timer timer-bank) (mode timer-mode))
|
|
|
|
"Initiate a timer, start counting at a rate of 1 every 256 bus clocks (BUSCLK: ~147.456MHz)."
|
|
|
|
(set! (-> timer mode) mode)
|
|
|
|
(set! (-> timer count) 0)
|
|
|
|
)
|
|
|
|
|
|
|
|
;; needs PS2 TIMER porting
|
|
|
|
(#unless PC_PORT
|
|
|
|
(timer-init (the-as timer-bank TIMER1_BANK) (new 'static 'timer-mode :clks (timer-clock-selection busclk/16) :cue 1))
|
|
|
|
)
|