From nobody Sat May 10 08:36:24 2025 Delivered-To: importer@patchew.org Received-SPF: none (zoho.com: 80.81.252.135 is neither permitted nor denied by domain of seabios.org) client-ip=80.81.252.135; envelope-from=seabios-bounces@seabios.org; helo=mail.coreboot.org; Authentication-Results: mx.zoho.com; spf=none (zoho.com: 80.81.252.135 is neither permitted nor denied by domain of seabios.org) smtp.mailfrom=seabios-bounces@seabios.org; Return-Path: Received: from mail.coreboot.org (mail.coreboot.org [80.81.252.135]) by mx.zohomail.com with SMTPS id 148731284156189.87143212408535; Thu, 16 Feb 2017 22:27:21 -0800 (PST) Received: from [127.0.0.1] (helo=ra.coresystems.de) by mail.coreboot.org with esmtp (Exim 4.86_2) (envelope-from ) id 1cec0V-0004K5-DW; Fri, 17 Feb 2017 07:27:03 +0100 Received: from mail-oi0-f53.google.com ([209.85.218.53]) by mail.coreboot.org with esmtps (TLSv1.2:ECDHE-RSA-AES128-GCM-SHA256:128) (Exim 4.86_2) (envelope-from ) id 1cec0L-0004IX-O0 for seabios@seabios.org; Fri, 17 Feb 2017 07:27:01 +0100 Received: by mail-oi0-f53.google.com with SMTP id u143so20023812oif.3 for ; Thu, 16 Feb 2017 22:26:53 -0800 (PST) Received: from Arrow.corp.skyportsystems.com (76-236-31-201.lightspeed.sntcca.sbcglobal.net. [76.236.31.201]) by smtp.gmail.com with ESMTPSA id 76sm4096050otf.21.2017.02.16.22.26.50 (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 16 Feb 2017 22:26:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=skyportsystems.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :in-reply-to:references; bh=9rAsWfryfiRutXxYuyuMn4dQH7nkYZ5S1Rehhi8cUZw=; b=5T65lN9ey1zfd8M+6NExB+nCnHLGgNTPE/jMJ73KBiOpZ69gEaUKm2eIkjbQsa93bV Gr5CfjyUHnYVDedQkZT47gw36DIhbusHcMFevB6rXZ339Ca5ZM6kTGhS+KK3ILmifzh2 K4+MqIiZiKf/24v0R0a86B0EUo8PZmjDr4qUk= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:in-reply-to:references; bh=9rAsWfryfiRutXxYuyuMn4dQH7nkYZ5S1Rehhi8cUZw=; b=dEdvFMAwWO1YE5g4PbCsBWd947REdcuNc6GDgKYaUTzDn8yjauEb30zJ1p4o79mbFK X0vt/lFFn+SdHfDbjwCy/8Lm2ytFPKPQCqEy6MOxi5QldHAZ45xa8hYxWhOA7YDvZU3B an5yrD/5L/vBFcCljNiSqLwEc5VAb9E8yV2TjrZRk/dRUUOYOIyua+Oc3jeKgKgy4MUU ei+u9EC7CBwnFdAvV+0egQRuyQCNPdfI9yN1frP0/fMyR3scpJ7pMl4Bn2BSSXjcy8Oi /oWIGWYdtiFhiChcPUJfGfKKEKxTK/mxvBadnp0bYNkacDa7kceXmSrx1EukP/qSS3cM VwWg== X-Gm-Message-State: AMke39msbQx+9E8WH8PwTiQBftLQlyPkJ1NVa81jsQlWEx9IrzSeq0xJHRYau895v+z+IyWd X-Received: by 10.202.173.18 with SMTP id w18mr3585238oie.146.1487312811263; Thu, 16 Feb 2017 22:26:51 -0800 (PST) From: ben@skyportsystems.com To: seabios@seabios.org Date: Thu, 16 Feb 2017 22:26:38 -0800 Message-Id: X-Mailer: git-send-email 2.10.1 (Apple Git-78) In-Reply-To: References: In-Reply-To: References: X-Spam-Score: -1.8 (-) Subject: [SeaBIOS] [PATCH v4 1/3] QEMU DMA: Add DMA write capability X-BeenThere: seabios@seabios.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: SeaBIOS mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lersek@redhat.com, mst@redhat.com MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Errors-To: seabios-bounces@seabios.org Sender: "SeaBIOS" X-Duff: Orig. Duff, Duff Lite, Duff Dry, Duff Dark, Raspberry Duff, Lady Duff, Red Duff, Tartar Control Duff X-ZohoMail: RSF_4 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" From: Ben Warren This allows BIOS to write data back to QEMU using the DMA interface and provides a higher-level abstraction to write to a fw_cfg file Signed-off-by: Ben Warren --- src/fw/paravirt.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ src/fw/paravirt.h | 3 +++ 2 files changed, 52 insertions(+) diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c index 6de70f6..75cb992 100644 --- a/src/fw/paravirt.c +++ b/src/fw/paravirt.c @@ -253,6 +253,20 @@ qemu_cfg_read(void *buf, int len) } =20 static void +qemu_cfg_write(void *buf, int len) +{ + if (len =3D=3D 0) { + return; + } + + if (qemu_cfg_dma_enabled()) { + qemu_cfg_dma_transfer(buf, len, QEMU_CFG_DMA_CTL_WRITE); + } else { + warn_internalerror(); + } +} + +static void qemu_cfg_skip(int len) { if (len =3D=3D 0) { @@ -280,6 +294,18 @@ qemu_cfg_read_entry(void *buf, int e, int len) } } =20 +static void +qemu_cfg_write_entry(void *buf, int e, int len) +{ + if (qemu_cfg_dma_enabled()) { + u32 control =3D (e << 16) | QEMU_CFG_DMA_CTL_SELECT + | QEMU_CFG_DMA_CTL_WRITE; + qemu_cfg_dma_transfer(buf, len, control); + } else { + warn_internalerror(); + } +} + struct qemu_romfile_s { struct romfile_s file; int select, skip; @@ -303,6 +329,29 @@ qemu_cfg_read_file(struct romfile_s *file, void *dst, = u32 maxlen) return file->size; } =20 +int +qemu_cfg_write_file(void *src, struct romfile_s *file, u32 offset, u32 len) +{ + if ((file->size + offset) < len) + return -1; + + if (!qemu_cfg_dma_enabled() || (file->copy !=3D qemu_cfg_read_file)) { + warn_internalerror(); + return -1; + } + struct qemu_romfile_s *qfile; + qfile =3D container_of(file, struct qemu_romfile_s, file); + if (offset =3D=3D 0) { + /* Do it in one transfer */ + qemu_cfg_write_entry(src, qfile->select, len); + } else { + qemu_cfg_select(qfile->select); + qemu_cfg_skip(offset); + qemu_cfg_write(src, len); + } + return len; +} + static void qemu_romfile_add(char *name, int select, int skip, int size) { diff --git a/src/fw/paravirt.h b/src/fw/paravirt.h index d8eb7c4..fb220d8 100644 --- a/src/fw/paravirt.h +++ b/src/fw/paravirt.h @@ -3,6 +3,7 @@ =20 #include "config.h" // CONFIG_* #include "biosvar.h" // GET_GLOBAL +#include "romfile.h" // struct romfile_s =20 // Types of paravirtualized platforms. #define PF_QEMU (1<<0) @@ -43,6 +44,7 @@ static inline int runningOnKVM(void) { #define QEMU_CFG_DMA_CTL_READ 0x02 #define QEMU_CFG_DMA_CTL_SKIP 0x04 #define QEMU_CFG_DMA_CTL_SELECT 0x08 +#define QEMU_CFG_DMA_CTL_WRITE 0x10 =20 // QEMU_CFG_DMA ID bit #define QEMU_CFG_VERSION_DMA 2 @@ -53,5 +55,6 @@ void qemu_platform_setup(void); void qemu_cfg_init(void); =20 u16 qemu_get_present_cpus_count(void); +int qemu_cfg_write_file(void *src, struct romfile_s *file, u32 offset, u32= len); =20 #endif --=20 2.7.4 _______________________________________________ SeaBIOS mailing list SeaBIOS@seabios.org https://www.coreboot.org/mailman/listinfo/seabios