[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PATCH v3 5/5] fw_cfg: document ACPI device node informatio
From: |
Gabriel L. Somlo |
Subject: |
[Qemu-devel] [PATCH v3 5/5] fw_cfg: document ACPI device node information |
Date: |
Thu, 17 Sep 2015 10:56:34 -0400 |
Signed-off-by: Gabriel Somlo <address@hidden>
---
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 5bc7b96..b5f4b5d 100644
--- a/docs/specs/fw_cfg.txt
+++ b/docs/specs/fw_cfg.txt
@@ -77,6 +77,15 @@ increasing address order, similar to memcpy().
Selector Register IOport: 0x510
Data Register IOport: 0x511
+== 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 BIOS can not use ACPI to find fw_cfg. However, once the
+bios 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
- [Qemu-devel] [PATCH v3 0/5] add ACPI node for fw_cfg on pc and arm, Gabriel L. Somlo, 2015/09/17
- [Qemu-devel] [PATCH v3 4/5] acpi: arm: add fw_cfg device node to dsdt, Gabriel L. Somlo, 2015/09/17
- [Qemu-devel] [PATCH v3 5/5] fw_cfg: document ACPI device node information,
Gabriel L. Somlo <=
- [Qemu-devel] [PATCH v3 2/5] pc: fw_cfg: move ioport base constant to pc.h, Gabriel L. Somlo, 2015/09/17
- [Qemu-devel] [PATCH v3 3/5] acpi: pc: add fw_cfg device node to ssdt, Gabriel L. Somlo, 2015/09/17
- [Qemu-devel] [PATCH v3 1/5] fw_cfg: expose control register size in fw_cfg.h, Gabriel L. Somlo, 2015/09/17
- Re: [Qemu-devel] [PATCH v3 0/5] add ACPI node for fw_cfg on pc and arm, Michael S. Tsirkin, 2015/09/17
- Re: [Qemu-devel] [PATCH v3 0/5] add ACPI node for fw_cfg on pc and arm, Igor Mammedov, 2015/09/23