From: Alan Cox <alan@linux.intel.com>
Date: Mon, 26 Mar 2018 19:53:51 +0000 (+0100)
Subject: z80fixedbank: first updated platform code for I/O wait
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=9dd89e95e8f43ab601a9d80b9966ac39b8767370;p=FUZIX.git

z80fixedbank: first updated platform code for I/O wait

Other platforms need the smae logic to bounce out of sleep when a signal
is shown pending
---

diff --git a/Kernel/lib/z80fixedbank.s b/Kernel/lib/z80fixedbank.s
index 22a8121d..0ba47638 100644
--- a/Kernel/lib/z80fixedbank.s
+++ b/Kernel/lib/z80fixedbank.s
@@ -51,6 +51,9 @@ _switchout:
         di
         call _chksigs
         ; save machine state
+	ld a,l
+	or a
+	jr nz, switchsig
 
         ld hl, #0 ; return code set here is ignored, but _switchin can 
         ; return from either _switchout OR _dofork, so they must both write 
@@ -86,6 +89,14 @@ idling:
 	ei
 	ret
 
+; As we tried to sleep we raced a signal so got the boot back out
+; into the land of the living.
+switchsig:
+	ld hl, (U_DATA__U_PTAB)
+	ld (hl), #P_RUNNING
+	ei
+	ret
+
 slow_path:
 	; Stash the uarea back into process memory
 	call map_process_always