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From: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
To: laurent@vivier.eu, qemu-devel@nongnu.org
Subject: [PATCH v2 1/8] mac_via: update comment for VIA1B_vMystery bit
Date: Wed, 20 Oct 2021 14:41:24 +0100	[thread overview]
Message-ID: <20211020134131.4392-2-mark.cave-ayland@ilande.co.uk> (raw)
In-Reply-To: <20211020134131.4392-1-mark.cave-ayland@ilande.co.uk>

According to both Linux and NetBSD, port B bit 6 is used on the Quadra 800 to
configure the GLUE logic in A/UX mode. Whilst the name VIA1B_vMystery isn't
particularly descriptive, the patch leaves this to ensure that the constants
in mac_via.c remain in sync with Linux's mac_via.h.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
---
 hw/misc/mac_via.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/hw/misc/mac_via.c b/hw/misc/mac_via.c
index 993bac017d..7a53a8b4c0 100644
--- a/hw/misc/mac_via.c
+++ b/hw/misc/mac_via.c
@@ -130,6 +130,10 @@
                                 * On SE/30, vertical sync interrupt enable.
                                 * 0=enabled. This vSync interrupt shows up
                                 * as a slot $E interrupt.
+                                * On Quadra 800 this bit toggles A/UX mode which
+                                * configures the glue logic to deliver some IRQs
+                                * at different levels compared to a classic
+                                * Mac.
                                 */
 #define VIA1B_vADBS2   0x20    /* ADB state input bit 1 (unused on IIfx) */
 #define VIA1B_vADBS1   0x10    /* ADB state input bit 0 (unused on IIfx) */
-- 
2.20.1



  reply	other threads:[~2021-10-20 13:44 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-20 13:41 [PATCH v2 0/8] q800: GLUE updates for A/UX mode Mark Cave-Ayland
2021-10-20 13:41 ` Mark Cave-Ayland [this message]
2021-10-20 13:41 ` [PATCH v2 2/8] q800: move VIA1 IRQ from level 1 to level 6 Mark Cave-Ayland
2021-10-20 13:41 ` [PATCH v2 3/8] q800: use GLUE IRQ numbers instead of IRQ level for GLUE IRQs Mark Cave-Ayland
2021-10-20 14:04   ` Laurent Vivier
2021-10-20 13:41 ` [PATCH v2 4/8] mac_via: add GPIO for A/UX mode Mark Cave-Ayland
2021-10-20 13:41 ` [PATCH v2 5/8] q800: wire up auxmode GPIO to GLUE Mark Cave-Ayland
2021-10-20 13:41 ` [PATCH v2 6/8] q800: route SONIC on-board Ethernet IRQ via nubus IRQ 9 in classic mode Mark Cave-Ayland
2021-10-20 14:07   ` Laurent Vivier
2021-10-20 13:41 ` [PATCH v2 7/8] q800: wire up remaining IRQs " Mark Cave-Ayland
2021-10-20 13:41 ` [PATCH v2 8/8] q800: add NMI handler Mark Cave-Ayland

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