On Fri, May 06, 2022 at 09:55:57PM +0100, Nikos Nikoleris wrote:
> From: Andrew Jones <drjones@xxxxxxxxxx>
>
> This will be used by future change to add PTE entries for special EFI
> memory regions.
>
> Signed-off-by: Nikos Nikoleris <nikos.nikoleris@xxxxxxx>
> ---
> lib/arm/asm/setup.h | 1 +
> lib/arm/mmu.c | 4 ++++
> 2 files changed, 5 insertions(+)
>
> diff --git a/lib/arm/asm/setup.h b/lib/arm/asm/setup.h
> index f0e70b1..64cd379 100644
> --- a/lib/arm/asm/setup.h
> +++ b/lib/arm/asm/setup.h
> @@ -15,6 +15,7 @@ extern int nr_cpus;
>
> #define MR_F_IO (1U << 0)
> #define MR_F_CODE (1U << 1)
> +#define MR_F_RESERVED (1U << 2)
> #define MR_F_UNKNOWN (1U << 31)
>
> struct mem_region {
> diff --git a/lib/arm/mmu.c b/lib/arm/mmu.c
> index e1a72fe..931be98 100644
> --- a/lib/arm/mmu.c
> +++ b/lib/arm/mmu.c
> @@ -174,6 +174,10 @@ void *setup_mmu(phys_addr_t phys_end, void *unused)
> for (r = mem_regions; r->end; ++r) {
> if (r->flags & MR_F_IO) {
> continue;
> + } else if (r->flags & MR_F_RESERVED) {
> + /* Reserved pages need to be writable for whatever reserved them */
> + mmu_set_range_ptes(mmu_idmap, r->start, r->start, r->end,
> + __pgprot(PTE_WBWA));
> } else if (r->flags & MR_F_CODE) {
> /* armv8 requires code shared between EL1 and EL0 to be read-only */
> mmu_set_range_ptes(mmu_idmap, r->start, r->start, r->end,
> --
> 2.25.1
>
Reviewed-by: Ricardo Koller <ricarkol@xxxxxxxxxx>
