On 06.06.2023 21:55, Oleksii Kurochko wrote:
> The patch series introduces things necessary to implement identity mapping:
> 1. Make identity mapping for _start and stack.
> 2. Enable MMU.
> 3. Jump to the virtual address world
> 4. Remove identity mapping for _start and stack.
>
> Also current patch series introduces the calculation of physical offset before
> MMU is enabled as access to physical offset will be calculated wrong after
> MMU will be enabled because access to phys_off variable is PC-relative and
> in the case when linker address != load address, it will cause MMU fault.
>
> One more thing that was done is:
> * Added SPDX tags.
> * Added __ASSEMBLY__ guards.
These are are, aiui, a response to a comment from Andrew. Hence I think
this wants expressing by a {Requested,Suggested,Reported}-by: tag in the
respective patch.
Jan
> * move extern of cpu0_boot_stack to a header.
>
> The reason for this patch series can be found here:
> https://lore.kernel.org/xen-devel/4e336121-fc0c-b007-bf7b-430352563...@citrix.com/
>
> Oleksii Kurochko (8):
> xen/riscv: make sure that identity mapping isn't bigger then page size
> xen/riscv: add .sbss section to .bss
> xen/riscv: introduce reset_stack() function
> xen/riscv: introduce function for physical offset calculation
> xen/riscv: introduce identity mapping
> xen/riscv: add SPDX tags
> xen/riscv: add __ASSEMBLY__ guards
> xen/riscv: move extern of cpu0_boot_stack to header
>
> xen/arch/riscv/include/asm/config.h | 2 +
> xen/arch/riscv/include/asm/current.h | 2 +
> xen/arch/riscv/include/asm/early_printk.h | 2 +
> xen/arch/riscv/include/asm/mm.h | 9 +-
> xen/arch/riscv/include/asm/page-bits.h | 2 +
> xen/arch/riscv/include/asm/page.h | 6 ++
> xen/arch/riscv/include/asm/traps.h | 2 +
> xen/arch/riscv/include/asm/types.h | 2 +
> xen/arch/riscv/mm.c | 119 +++++++++++++++-------
> xen/arch/riscv/riscv64/head.S | 40 +++++++-
> xen/arch/riscv/setup.c | 16 +--
> xen/arch/riscv/xen.lds.S | 11 +-
> 12 files changed, 160 insertions(+), 53 deletions(-)
>
