The patch series introduces basic UART support (in interrupt mode) and support of
interrupts for hypervisor mode.

To implement this the following has been added:
- APLIC and IMISC initialization.
- Introduce of intc_hw_operations abstraction.
- Introduce some APLIC and IMSIC operations.
- Introduce init_IRQ(), platform_get_irq() and setup_irq() functions.
- Update do_trap() handler to handle IRQ_S_EXT.
- Introduce some other functions such as: get_s_time(), smp_clear_cpu_maps(),
  ioremap().
- Enable UART. 

CI tests: https://gitlab.com/xen-project/people/olkur/xen/-/pipelines/1910703345
---
Changes in V6:
 - Have been merged to staging:
   [PATCH v5 2/9] xen/riscv: introduce register_intc_ops() and intc_hw_ops.
   [PATCH v4 1/9] xen/riscv: dt_processor_hartid()
 - All other changes are patch-specific. Please check each patch separately.
---
Changes in V5:
 - Update CI tests link.
 - Mostly changes are patch-specific. Please check each patch separately.
---
Changes in V4:
 - Merged to staging:
    - xen/riscv: initialize bitmap to zero in riscv_fill_hwcap_from_isa_string()
    - xen/asm-generic: introduce asm-generic/irq-dt.h
    - xen/riscv: introduce smp_prepare_boot_cpu()
    - xen/riscv: introduce support of Svpbmt extension
    - add ioremap_*() variants using ioremap_attr()
    - xen/riscv: introduce init_IRQ()
    - xen/riscv: introduce platform_get_irq()
 - All other changes are patch-specific. Please check each patch separately.
---
Changes in V2:
 - Merged to staging:
    xen/riscv: initialize bitmap to zero in riscv_fill_hwcap_from_isa_string()
    xen/asm-generic: introduce asm-generic/irq-dt.h
 - All other changes are patch-specific. Please check each patch separately.
---

Oleksii Kurochko (7):
  xen/riscv: imsic_init() implementation
  xen/riscv: aplic_init() implementation
  xen/riscv: introduce intc_init() and helpers
  xen/riscv: implementation of aplic and imsic operations
  xen/riscv: add external interrupt handling for hypervisor mode
  xen/riscv: implement setup_irq()
  xen/riscv: add basic UART support

 xen/arch/riscv/Kconfig             |   1 +
 xen/arch/riscv/Makefile            |   1 +
 xen/arch/riscv/aplic-priv.h        |  38 +++
 xen/arch/riscv/aplic.c             | 297 ++++++++++++++++++
 xen/arch/riscv/imsic.c             | 489 +++++++++++++++++++++++++++++
 xen/arch/riscv/include/asm/aplic.h |  73 +++++
 xen/arch/riscv/include/asm/imsic.h |  74 +++++
 xen/arch/riscv/include/asm/intc.h  |  13 +
 xen/arch/riscv/include/asm/irq.h   |   8 +-
 xen/arch/riscv/include/asm/smp.h   |  13 +
 xen/arch/riscv/intc.c              |  46 +++
 xen/arch/riscv/irq.c               | 131 ++++++++
 xen/arch/riscv/setup.c             |  14 +
 xen/arch/riscv/traps.c             |  19 ++
 xen/drivers/char/Kconfig           |   3 +-
 15 files changed, 1217 insertions(+), 3 deletions(-)
 create mode 100644 xen/arch/riscv/aplic-priv.h
 create mode 100644 xen/arch/riscv/imsic.c
 create mode 100644 xen/arch/riscv/include/asm/aplic.h
 create mode 100644 xen/arch/riscv/include/asm/imsic.h

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2.50.0