From: "Gabriel L. Somlo" <somlo@cmu.edu>
To: qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, ehabkost@redhat.com, mst@redhat.com,
matt@codeblueprint.co.uk, stefanha@gmail.com,
ard.biesheuvel@linaro.org, leif.lindholm@linaro.org,
luto@amacapital.net, qemu-arm@nongnu.org, kraxel@redhat.com,
pbonzini@redhat.com, imammedo@redhat.com, lersek@redhat.com,
rth@twiddle.net
Subject: [Qemu-devel] [PATCH v8 5/5] fw_cfg: document ACPI device node information
Date: Thu, 11 Feb 2016 17:06:05 -0500 [thread overview]
Message-ID: <1455228365-13666-6-git-send-email-somlo@cmu.edu> (raw)
In-Reply-To: <1455228365-13666-1-git-send-email-somlo@cmu.edu>
Signed-off-by: Gabriel Somlo <somlo@cmu.edu>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Marc Marí <markmb@redhat.com>
---
docs/specs/fw_cfg.txt | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/docs/specs/fw_cfg.txt b/docs/specs/fw_cfg.txt
index 2099ad9..5414140 100644
--- a/docs/specs/fw_cfg.txt
+++ b/docs/specs/fw_cfg.txt
@@ -84,6 +84,15 @@ Selector Register address: Base + 8 (2 bytes)
Data Register address: Base + 0 (8 bytes)
DMA Address address: Base + 16 (8 bytes)
+== ACPI Interface ==
+
+The fw_cfg device is defined with ACPI ID "QEMU0002". Since we expect
+ACPI tables to be passed into the guest through the fw_cfg device itself,
+the guest-side firmware can not use ACPI to find fw_cfg. However, once the
+firmware is finished setting up ACPI tables and hands control over to the
+guest kernel, the latter can use the fw_cfg ACPI node for a more accurate
+inventory of in-use IOport or MMIO regions.
+
== Firmware Configuration Items ==
=== Signature (Key 0x0000, FW_CFG_SIGNATURE) ===
--
2.4.3
next prev parent reply other threads:[~2016-02-11 22:06 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-11 22:06 [Qemu-devel] [PATCH v8 0/5] add ACPI node for fw_cfg on pc and arm Gabriel L. Somlo
2016-02-11 22:06 ` [Qemu-devel] [PATCH v8 1/5] fw_cfg: expose control register size in fw_cfg.h Gabriel L. Somlo
2016-02-11 22:06 ` [Qemu-devel] [PATCH v8 2/5] pc: fw_cfg: move ioport base constant to pc.h Gabriel L. Somlo
2016-02-11 22:06 ` [Qemu-devel] [PATCH v8 3/5] acpi: pc: add fw_cfg device node to dsdt Gabriel L. Somlo
2016-02-19 13:49 ` Igor Mammedov
2016-02-19 16:59 ` Gabriel L. Somlo
2016-02-11 22:06 ` [Qemu-devel] [PATCH v8 4/5] acpi: arm: " Gabriel L. Somlo
2016-02-11 22:06 ` Gabriel L. Somlo [this message]
2016-02-16 23:49 ` [Qemu-devel] [PATCH v8 0/5] add ACPI node for fw_cfg on pc and arm Gabriel L. Somlo
2016-02-19 7:08 ` Gerd Hoffmann
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