Hello,
On 11/2/20 10:30 AM, Rouven Czerwinski wrote:
> Traverse the reserved memory map and map areas which are marked with
> uncached as uncached (and thus noexec).
>
> Signed-off-by: Rouven Czerwinski <r.czerwinski@xxxxxxxxxxxxxx>
> ---
> arch/arm/cpu/mmu.c | 14 ++++++++++++++
> include/of.h | 5 +++++
> 2 files changed, 19 insertions(+)
>
> diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c
> index 6af228505d..5974e1e38a 100644
> --- a/arch/arm/cpu/mmu.c
> +++ b/arch/arm/cpu/mmu.c
> @@ -17,6 +17,7 @@
> #include <memory.h>
> #include <asm/system_info.h>
> #include <asm/sections.h>
> +#include <of.h>
>
> #include "mmu.h"
>
> @@ -393,6 +394,8 @@ static void vectors_init(void)
> void __mmu_init(bool mmu_on)
> {
> struct memory_bank *bank;
> + struct of_reserve_map *res_map;
> + int i;
>
> arm_set_cache_functions();
>
> @@ -453,6 +456,17 @@ void __mmu_init(bool mmu_on)
> __mmu_cache_flush();
> }
>
> + res_map = of_get_reserve_map();
> + if (res_map) {
> + for (i = 0; i < res_map->num_entries; i++) {
> + if (res_map->uncached & BIT(i)) {
> + create_sections(ttb, res_map->start[i],
> + res_map->end[i],
> + PMD_SECT_DEF_UNCACHED);
PMD_SECT_DEF_UNCACHED does _not_ include PMD_SECT_XN. See create_flat_mapping()
Also, code earlier does __mmu_cache_flush() after each create_sections.
Don't we need this here as well? (Or is it not needed at all?)
> + }
> + }
> + }
> +
> __mmu_cache_on();
> }
>
> diff --git a/include/of.h b/include/of.h
> index 5d7f54fb36..3d8c26f319 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -1042,6 +1042,11 @@ static inline int of_firmware_load_overlay(struct device_node *overlay, const ch
> {
> return -ENOSYS;
> }
> +
> +static inline struct of_reserve_map *of_get_reserve_map(void)
> +{
> + return NULL;
> +}
This should results in an error because a static declaration follows a non-static
one. You need to move the extern of_get_reserve_map into the #ifdef as well.
> #endif
>
> #endif /* __OF_H */
>
--
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