[v1] First batch of misc (i386, kernel-doc, memory, vl.c) changes for QEMU 6.0

[PULL 050/113] hw/char/serial: Clean up unnecessary code

Paolo Bonzini posted 113 patches 5 years, 2 months ago

Diff against v2 v2
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Maintainers: Radoslaw Biernacki <rad@semihalf.com>, Igor Mammedov <imammedo@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, Michael Rolnik <mrolnik@gmail.com>, Tyrone Ting <kfting@nuvoton.com>, "Daniel P. Berrangé" <berrange@redhat.com>, "Cédric Le Goater" <clg@kaod.org>, Sunil Muthuswamy <sunilmut@microsoft.com>, Aurelien Jarno <aurelien@aurel32.net>, Halil Pasic <pasic@linux.ibm.com>, Rob Herring <robh@kernel.org>, Alexander Bulekov <alxndr@bu.edu>, Sarah Harris <S.E.Harris@kent.ac.uk>, Sagar Karandikar <sagark@eecs.berkeley.edu>, Alistair Francis <alistair@alistair23.me>, David Hildenbrand <david@redhat.com>, BALATON Zoltan <balaton@eik.bme.hu>, Andrew Jeffery <andrew@aj.id.au>, "Michael S. Tsirkin" <mst@redhat.com>, Antony Pavlov <antonynpavlov@gmail.com>, Stefano Stabellini <sstabellini@kernel.org>, Laszlo Ersek <lersek@redhat.com>, Leif Lindholm <leif@nuviainc.com>, Juan Quintela <quintela@redhat.com>, Cornelia Huck <cohuck@redhat.com>, David Gibson <david@gibson.dropbear.id.au>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Stefan Hajnoczi <stefanha@redhat.com>, Laurent Vivier <laurent@vivier.eu>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Bandan Das <bsd@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Michael Walle <michael@walle.cc>, Artyom Tarasenko <atar4qemu@gmail.com>, Markus Armbruster <armbru@redhat.com>, Havard Skinnemoen <hskinnemoen@google.com>, Gerd Hoffmann <kraxel@redhat.com>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Peter Maydell <peter.maydell@linaro.org>, Cleber Rosa <crosa@redhat.com>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, Palmer Dabbelt <palmer@dabbelt.com>, Anthony Perard <anthony.perard@citrix.com>, "Hervé Poussineau" <hpoussin@reactos.org>, Fabien Chouteau <chouteau@adacore.com>, Paul Durrant <paul@xen.org>, Joel Stanley <joel@jms.id.au>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Helge Deller <deller@gmx.de>, Paolo Bonzini <pbonzini@redhat.com>, Thomas Huth <thuth@redhat.com>, Marcelo Tosatti <mtosatti@redhat.com>, Chris Wulff <crwulff@gmail.com>, Thomas Huth <huth@tuxfamily.org>, Marek Vasut <marex@denx.de>, Huacai Chen <chenhc@lemote.com>, Alistair Francis <Alistair.Francis@wdc.com>, John Snow <jsnow@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>, Laurent Vivier <lvivier@redhat.com>, Andrzej Zaborowski <balrogg@gmail.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Christian Borntraeger <borntraeger@de.ibm.com>, KONRAD Frederic <frederic.konrad@adacore.com>

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[PULL 050/113] hw/char/serial: Clean up unnecessary code

Posted by Paolo Bonzini 5 years, 2 months ago

From: Philippe Mathieu-Daudé <f4bug@amsat.org>

Since commit 5ec3a23e6c8 ("serial: convert PIO to new memory
api read/write") we don't need to worry about accesses bigger
than 8-bit. Use the extract()/deposit() functions to access
the correct part of the 16-bit 'divider' register.

Reported-by: Jonathan D. Belanger <jbelanger1@rochester.rr.com>
Buglink: https://bugs.launchpad.net/qemu/+bug/1904331
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20201120161933.2514089-1-f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/char/serial.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/hw/char/serial.c b/hw/char/serial.c
index 97f71879ff..62c627f486 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -24,6 +24,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/bitops.h"
 #include "hw/char/serial.h"
 #include "hw/irq.h"
 #include "migration/vmstate.h"
@@ -338,11 +339,7 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
     default:
     case 0:
         if (s->lcr & UART_LCR_DLAB) {
-            if (size == 1) {
-                s->divider = (s->divider & 0xff00) | val;
-            } else {
-                s->divider = val;
-            }
+            s->divider = deposit32(s->divider, 8 * addr, 8, val);
             serial_update_parameters(s);
         } else {
             s->thr = (uint8_t) val;
@@ -364,7 +361,7 @@ static void serial_ioport_write(void *opaque, hwaddr addr, uint64_t val,
         break;
     case 1:
         if (s->lcr & UART_LCR_DLAB) {
-            s->divider = (s->divider & 0x00ff) | (val << 8);
+            s->divider = deposit32(s->divider, 8 * addr, 8, val);
             serial_update_parameters(s);
         } else {
             uint8_t changed = (s->ier ^ val) & 0x0f;
@@ -478,7 +475,7 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size)
     default:
     case 0:
         if (s->lcr & UART_LCR_DLAB) {
-            ret = s->divider & 0xff;
+            ret = extract16(s->divider, 8 * addr, 8);
         } else {
             if(s->fcr & UART_FCR_FE) {
                 ret = fifo8_is_empty(&s->recv_fifo) ?
@@ -502,7 +499,7 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr addr, unsigned size)
         break;
     case 1:
         if (s->lcr & UART_LCR_DLAB) {
-            ret = (s->divider >> 8) & 0xff;
+            ret = extract16(s->divider, 8 * addr, 8);
         } else {
             ret = s->ier;
         }
-- 
2.26.2