@@ -1024,6 +1024,34 @@ void mmu_change_region_attr(phys_addr_t addr, size_t siz, u64 attrs)
__asm_invalidate_tlb_all();
}
+void mmu_change_region_attr_nobreak(phys_addr_t addr, size_t siz, u64 attrs)
+{
+ int level;
+ u64 r, size, start;
+
+ /*
+ * Loop through the address range until we find a page granule that fits
+ * our alignment constraints, then set it to the new cache attributes
+ */
+ start = addr;
+ size = siz;
+ while (size > 0) {
+ for (level = 1; level < 4; level++) {
+ /* Set PTE to new attributes */
+ r = set_one_region(start, size, attrs, true, level);
+ if (r) {
+ /* PTE successfully updated */
+ size -= r;
+ start += r;
+ break;
+ }
+ }
+ }
+ flush_dcache_range(gd->arch.tlb_addr,
+ gd->arch.tlb_addr + gd->arch.tlb_size);
+ __asm_invalidate_tlb_all();
+}
+
#else /* !CONFIG_IS_ENABLED(SYS_DCACHE_OFF) */
/*
@@ -287,8 +287,26 @@ void flush_l3_cache(void);
* @emerg: Also map the region in the emergency table
*/
void mmu_map_region(phys_addr_t start, u64 size, bool emerg);
+
+/**
+ * mmu_change_region_attr() - change a mapped region attributes
+ *
+ * @start: Start address of the region
+ * @size: Size of the region
+ * @aatrs: New attributes
+ */
void mmu_change_region_attr(phys_addr_t start, size_t size, u64 attrs);
+/**
+ * mmu_change_region_attr_nobreak() - change a mapped region attributes without doing
+ * break-before-make
+ *
+ * @start: Start address of the region
+ * @size: Size of the region
+ * @aatrs: New attributes
+ */
+void mmu_change_region_attr_nobreak(phys_addr_t addr, size_t size, u64 attrs);
+
/*
* smc_call() - issue a secure monitor call
*
The ARM ARM on section 8.17.1 describes the cases where break-before-make is required when changing live page tables. Since we can use this function to tweak block and page permssions, where BBM is not required add an extra argument to the function. While at it add a function description. Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org> --- arch/arm/cpu/armv8/cache_v8.c | 28 ++++++++++++++++++++++++++++ arch/arm/include/asm/system.h | 18 ++++++++++++++++++ 2 files changed, 46 insertions(+)