From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:50045) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TH8pH-0007md-KC for qemu-devel@nongnu.org; Thu, 27 Sep 2012 03:48:12 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1TH8pA-00014D-Mp for qemu-devel@nongnu.org; Thu, 27 Sep 2012 03:48:03 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38504) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1TH8pA-000141-Em for qemu-devel@nongnu.org; Thu, 27 Sep 2012 03:47:56 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id q8R7ltaK023091 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 27 Sep 2012 03:47:55 -0400 From: Gerd Hoffmann Date: Thu, 27 Sep 2012 09:47:52 +0200 Message-Id: <1348732073-18986-3-git-send-email-kraxel@redhat.com> In-Reply-To: <1348732073-18986-1-git-send-email-kraxel@redhat.com> References: <1348732073-18986-1-git-send-email-kraxel@redhat.com> Subject: [Qemu-devel] [PATCH 2/3] vga: add specs for standard vga List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: Gerd Hoffmann Signed-off-by: Gerd Hoffmann --- docs/specs/standard-vga.txt | 64 +++++++++++++++++++++++++++++++++++++++++++ hw/vga-isa.c | 2 + hw/vga-pci.c | 2 + 3 files changed, 68 insertions(+), 0 deletions(-) create mode 100644 docs/specs/standard-vga.txt diff --git a/docs/specs/standard-vga.txt b/docs/specs/standard-vga.txt new file mode 100644 index 0000000..1cecccd --- /dev/null +++ b/docs/specs/standard-vga.txt @@ -0,0 +1,64 @@ + +QEMU Standard VGA +================= + +Exists in two variants, for isa and pci. + +command line switches: + -vga std [ picks isa for -M isapc, otherwise pci ] + -device VGA [ pci variant ] + -device isa-vga [ isa variant ] + + +PCI spec +-------- + +Applies to the pci variant only for obvious reasons. + +PCI ID: 1234:1111 + +PCI Region 0: + Framebuffer memory, 16 MB in size (by default). + Size is tunable via vga_mem_mb property. + +PCI Region 1: + Reserved (so we have the option to make the framebuffer bar 64bit). + +PCI Region 2: + MMIO bar, 4096 bytes in size (qemu 1.3+) + +PCI ROM Region: + Holds the vgabios (qemu 0.14+). + + +IO ports used +------------- + +03c0 - 03df : standard vga ports +01ce : bochs vbe interface index port +01cf : bochs vbe interface data port + + +Memory regions used +------------------- + +0xe0000000 : Framebuffer memory, isa variant only. + +The pci variant used to mirror the framebuffer bar here, qemu 0.14+ +stops doing that (except when in -M pc-$old compat mode). + + +MMIO area spec +-------------- + +Likewise applies to the pci variant only for obvious reasons. + +0000 - 03ff : reserved, for possible virtio extension. +0400 - 041f : vga ioports (0x3c0 -> 0x3df), remapped 1:1. + word access is supported, bytes are written + in little endia order (aka index port first), + so indexed registers can be updated with a + single mmio write (and thus only one vmexit). +0500 - 0515 : bochs dispi interface registers, mapped flat + without index/data ports. Use (index << 1) + as offset for (16bit) register access. diff --git a/hw/vga-isa.c b/hw/vga-isa.c index d290473..046602b 100644 --- a/hw/vga-isa.c +++ b/hw/vga-isa.c @@ -1,6 +1,8 @@ /* * QEMU ISA VGA Emulator. * + * see docs/specs/standard-vga.txt for virtual hardware specs. + * * Copyright (c) 2003 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy diff --git a/hw/vga-pci.c b/hw/vga-pci.c index df1a1f1..9b1e3ee 100644 --- a/hw/vga-pci.c +++ b/hw/vga-pci.c @@ -1,6 +1,8 @@ /* * QEMU PCI VGA Emulator. * + * see docs/specs/standard-vga.txt for virtual hardware specs. + * * Copyright (c) 2003 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy -- 1.7.1