[PATCH v3 00/14] riscv: introduce basic UART support and interrupts for hypervisor mode

[Oleksii Kurochko <oleksii.kurochko@gmail.com>]

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/1829069921
---
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 (14):
  xen/riscv: introduce smp_prepare_boot_cpu()
  xen/riscv: introduce support of Svpbmt extension and make it mandatory
  xen/riscv: add ioremap_*() variants using ioremap_attr()
  xen/riscv: introduce init_IRQ()
  xen/riscv: introduce platform_get_irq()
  xen/riscv: dt_processor_hartid() implementation
  xen/riscv: introduce register_intc_ops() and intc_hw_ops.
  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

 automation/scripts/qemu-smoke-riscv64.sh |   1 +
 docs/misc/riscv/booting.txt              |   4 +
 xen/arch/riscv/Kconfig                   |   5 +
 xen/arch/riscv/Makefile                  |   3 +
 xen/arch/riscv/aplic-priv.h              |  38 ++
 xen/arch/riscv/aplic.c                   | 300 ++++++++++++++
 xen/arch/riscv/cpufeature.c              |   2 +
 xen/arch/riscv/imsic.c                   | 474 +++++++++++++++++++++++
 xen/arch/riscv/include/asm/Makefile      |   1 +
 xen/arch/riscv/include/asm/aplic.h       |  73 ++++
 xen/arch/riscv/include/asm/cpufeature.h  |   1 +
 xen/arch/riscv/include/asm/fixmap.h      |   2 +-
 xen/arch/riscv/include/asm/imsic.h       |  84 ++++
 xen/arch/riscv/include/asm/intc.h        |  32 ++
 xen/arch/riscv/include/asm/io.h          |  10 +-
 xen/arch/riscv/include/asm/irq.h         |  24 ++
 xen/arch/riscv/include/asm/mm-types.h    |   8 +
 xen/arch/riscv/include/asm/page.h        |  23 +-
 xen/arch/riscv/include/asm/smp.h         |  17 +
 xen/arch/riscv/intc.c                    |  55 +++
 xen/arch/riscv/irq.c                     | 223 +++++++++++
 xen/arch/riscv/mm.c                      |  30 ++
 xen/arch/riscv/pt.c                      |  20 +-
 xen/arch/riscv/setup.c                   |  21 +-
 xen/arch/riscv/smpboot.c                 |  85 ++++
 xen/arch/riscv/stubs.c                   |  11 -
 xen/arch/riscv/traps.c                   |  19 +
 xen/arch/riscv/xen.lds.S                 |   2 +
 xen/drivers/char/Kconfig                 |   3 +-
 29 files changed, 1537 insertions(+), 34 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
 create mode 100644 xen/arch/riscv/include/asm/mm-types.h
 create mode 100644 xen/arch/riscv/irq.c
 create mode 100644 xen/arch/riscv/smpboot.c

-- 
2.49.0