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| author | user <user@clank> | 2026-07-17 13:43:10 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-17 13:43:10 +0200 |
| commit | b52f37602968768901d2dd83ccf966d953a532f0 (patch) | |
| tree | d497c52bf672291d1cd9cf0579b6191155cb56d4 /include | |
| parent | net: keep network packets out of the console (fixes shell garbage on netboot) (diff) | |
| download | gbos-b52f37602968768901d2dd83ccf966d953a532f0.tar.gz gbos-b52f37602968768901d2dd83ccf966d953a532f0.tar.xz gbos-b52f37602968768901d2dd83ccf966d953a532f0.zip | |
kernel: sys_sleep - a cooperative delay off the DIV timer (+ ping pacing)
There was no time source at all (IRQ vectors just reti; scheduler is purely
cooperative). The DIV register (FF04) free-runs at 16384 Hz regardless of
interrupts, so sys_sleep accumulates DIV deltas across SchedYields (other procs
keep running) until the requested number of 1/64-second units elapse.
- SYS_SLEEP(34): B = 1/64s units; libc gsleep(units) / msleep(ms) wrappers.
- ping now msleep(800) between echoes, so it paces like real ping instead of
blasting all four at once.
Verified real-time (capped emulator): replies land ~0.85s apart. In --uncapped
runs the delay is GB-time (fast wall-clock), as expected.
Diffstat (limited to '')
| -rw-r--r-- | include/gbos.inc | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/gbos.inc b/include/gbos.inc index 74eee8e..049a4bc 100644 --- a/include/gbos.inc +++ b/include/gbos.inc @@ -10,6 +10,7 @@ DEF GBOS_INC EQU 1 ; ----------------------------------------------------------------------------- DEF rIF EQU $FF0F ; interrupt flags DEF rIE EQU $FFFF ; interrupt enable +DEF rDIV EQU $FF04 ; divider register: free-running 8-bit @ 16384 Hz DEF rSVBK EQU $FF70 ; CGB WRAM bank select ($D000-$DFFF): 1..7 DEF wCurMask EQU $D589 ; term/osk: cursor underline bits OR'd into a tile's last row DEF OSK_DOCK EQU 3 ; on-screen keyboard height in rows (dock at the bottom) @@ -131,7 +132,8 @@ DEF SYS_SRECV EQU 30 ; link-port: receive one byte (-> A=byte, blocks) DEF SYS_SRECVNB EQU 31 ; link-port: receive, non-blocking (-> A=byte, CF=none) DEF SYS_POLLIN EQU 32 ; poll OSK for a typed char (-> A=char or 0) DEF SYS_NET EQU 33 ; socket layer (DE=&netreq -> A=result) -DEF SYS_MAX EQU 34 +DEF SYS_SLEEP EQU 34 ; cooperative delay (B = 1/64-second units) +DEF SYS_MAX EQU 35 ; ---- socket layer (SYS_NET) -------------------------------------------------- ; netreq struct (in caller RAM; DE points to it): |