On 17.05.23 11:03, Sascha Hauer wrote:
> Signed-off-by: Sascha Hauer <[email protected]>
> ---
> arch/arm/cpu/mmu_32.c | 35 +++++++++++++++++++++++++++++------
> 1 file changed, 29 insertions(+), 6 deletions(-)
>
> diff --git a/arch/arm/cpu/mmu_32.c b/arch/arm/cpu/mmu_32.c
> index 4abaab7d87..0af89ac39c 100644
> --- a/arch/arm/cpu/mmu_32.c
> +++ b/arch/arm/cpu/mmu_32.c
> @@ -187,30 +187,53 @@ static u32 pmd_flags_to_pte(u32 pmd)
> return pte;
> }
>
> +static u32 pte_flags_to_pmd(u32 pte)
> +{
> + u32 pmd = 0;
> +
> + if (pte & PTE_BUFFERABLE)
> + pmd |= PMD_SECT_BUFFERABLE;
> + if (pte & PTE_CACHEABLE)
> + pmd |= PMD_SECT_CACHEABLE;
> +
> + if (cpu_architecture() >= CPU_ARCH_ARMv7) {
> + if (pte & PTE_EXT_NG)
> + pmd |= PMD_SECT_nG;
> + if (pte & PTE_EXT_XN)
> + pmd |= PMD_SECT_XN;
Note that at least, <asm/pgtable.h> claims these bits are v6+:
#define PTE_EXT_XN (1 << 0) /* v6 */
#define PMD_SECT_nG (1 << 17) /* v6 */
> +
> + /* TEX[2:0] */
> + pmd |= ((pte >> 6) & 7) << 12;
> + /* AP[1:0] */
> + pmd |= ((pte >> 4) & 0x3) << 10;
> + /* AP[2] */
> + pmd |= ((pte >> 9) & 0x1) << 15;
> + } else {
> + pmd |= PMD_SECT_AP_WRITE | PMD_SECT_AP_READ;
> + }
> +
> + return pmd;
> +}
> +
> int arch_remap_range(void *start, size_t size, unsigned flags)
> {
> u32 addr = (u32)start;
> u32 pte_flags;
> - u32 pgd_flags;
>
> BUG_ON(!IS_ALIGNED(addr, PAGE_SIZE));
>
> switch (flags) {
> case MAP_CACHED:
> pte_flags = pte_flags_cached;
> - pgd_flags = PMD_SECT_DEF_CACHED;
> break;
> case MAP_UNCACHED:
> pte_flags = pte_flags_uncached;
> - pgd_flags = pgd_flags_uncached;
> break;
> case MAP_FAULT:
> pte_flags = 0x0;
> - pgd_flags = 0x0;
> break;
> case ARCH_MAP_WRITECOMBINE:
> pte_flags = pte_flags_wc;
> - pgd_flags = pgd_flags_wc;
> break;
> default:
> return -EINVAL;
> @@ -228,7 +251,7 @@ int arch_remap_range(void *start, size_t size, unsigned
> flags)
> * replace it with a section
> */
> chunk = PGDIR_SIZE;
> - *pgd = addr | pgd_flags;
> + *pgd = addr | pte_flags_to_pmd(pte_flags) |
> PMD_TYPE_SECT;
> dma_flush_range(pgd, sizeof(*pgd));
> } else {
> unsigned int num_ptes;
--
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