[Xen-devel] [PATCH 0/8] Emulate virtual UART for DOM0 and some UART clean up

[Julien Grall <julien.grall@xxxxxxxxxx>]

Hi,

This patch series follows the thread http://patches.linaro.org/18358/ on Linux.

In some configuration, the kernel can use hardcoded code to access to the
UART (for instance early printk). If Xen has stolen the UART for its own use,
DOM0 will abort because Xen has not mapped to DOM0 the UART memory.

With this patch series, Xen will "replace" the real UART by a basic virtual
UART for DOM0.

For the moment, this patch series is not able to cooperate with early printk
in guest kernel. To fix it, there is 2 approach:
    - Expose a pl011 UART for guest
    - Implement xen early in Linux

Any ideas on the best solution?

This patch series also contains clean up for the pl011 and exynos4210 drivers.

Cheers,

Julien Grall (8):
  pl011: Use ioreadl/iowritel
  pl011: Move registers' definition in a separate file
  xen/arm: Use define instead of hardcoded value in debug-pl011
  xen/arm: New callback in uart_driver to retrieve serial information
  xen/arm: Implement a virtual UART
  exynos4210: rename UTRSTAT_TX_EMPTY in UTRSTAT_TXFE
  exynos4210: Implement serial_info callback
  pl011: Implement serial_info callback

 xen/arch/arm/Makefile                   |    2 +-
 xen/arch/arm/arm32/debug-exynos4210.inc |    2 +-
 xen/arch/arm/arm32/debug-pl011.inc      |   18 ++--
 xen/arch/arm/domain.c                   |   12 ++-
 xen/arch/arm/io.c                       |    2 +-
 xen/arch/arm/io.h                       |    2 +-
 xen/arch/arm/vpl011.c                   |  152 -------------------------------
 xen/arch/arm/vpl011.h                   |   35 -------
 xen/arch/arm/vuart.c                    |  150 ++++++++++++++++++++++++++++++
 xen/arch/arm/vuart.h                    |   35 +++++++
 xen/drivers/char/exynos4210-uart.c      |   15 +++
 xen/drivers/char/pl011.c                |  115 +++++++++--------------
 xen/drivers/char/serial.c               |    8 ++
 xen/include/asm-arm/domain.h            |   14 +--
 xen/include/asm-arm/exynos4210-uart.h   |    3 +-
 xen/include/asm-arm/pl011-uart.h        |   81 ++++++++++++++++
 xen/include/xen/serial.h                |   13 +++
 17 files changed, 378 insertions(+), 281 deletions(-)
 delete mode 100644 xen/arch/arm/vpl011.c
 delete mode 100644 xen/arch/arm/vpl011.h
 create mode 100644 xen/arch/arm/vuart.c
 create mode 100644 xen/arch/arm/vuart.h
 create mode 100644 xen/include/asm-arm/pl011-uart.h

-- 
1.7.10.4


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