Merge remote-tracking branch 'arm64/for-next/core'

[karo-tx-linux.git] / arch / arm64 / include / asm / pgtable.h

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index 571ca0ed4f0565378131b25f317ef8b2f819c3b2..f3acf421ded4f55616abd7b68a7dcf83081e6f38 100644 (file)
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -41,7 +41,14 @@
  *     fixed mappings and modules
  */
 #define VMEMMAP_SIZE           ALIGN((1UL << (VA_BITS - PAGE_SHIFT)) * sizeof(struct page), PUD_SIZE)
-#define VMALLOC_START          (UL(0xffffffffffffffff) << VA_BITS)
+
+#ifndef CONFIG_KASAN
+#define VMALLOC_START          (VA_START)
+#else
+#include <asm/kasan.h>
+#define VMALLOC_START          (KASAN_SHADOW_END + SZ_64K)
+#endif
+
 #define VMALLOC_END            (PAGE_OFFSET - PUD_SIZE - VMEMMAP_SIZE - SZ_64K)
 
 #define vmemmap                        ((struct page *)(VMALLOC_END + SZ_64K))
@@ -74,6 +81,7 @@ extern void __pgd_error(const char *file, int line, unsigned long val);
 
 #define PAGE_KERNEL            __pgprot(_PAGE_DEFAULT | PTE_PXN | PTE_UXN | PTE_DIRTY | PTE_WRITE)
 #define PAGE_KERNEL_EXEC       __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE)
+#define PAGE_KERNEL_EXEC_CONT  __pgprot(_PAGE_DEFAULT | PTE_UXN | PTE_DIRTY | PTE_WRITE | PTE_CONT)
 
 #define PAGE_HYP               __pgprot(_PAGE_DEFAULT | PTE_HYP)
 #define PAGE_HYP_DEVICE                __pgprot(PROT_DEVICE_nGnRE | PTE_HYP)
@@ -142,6 +150,7 @@ extern struct page *empty_zero_page;
 #define pte_special(pte)       (!!(pte_val(pte) & PTE_SPECIAL))
 #define pte_write(pte)         (!!(pte_val(pte) & PTE_WRITE))
 #define pte_exec(pte)          (!(pte_val(pte) & PTE_UXN))
+#define pte_cont(pte)          (!!(pte_val(pte) & PTE_CONT))
 
 #ifdef CONFIG_ARM64_HW_AFDBM
 #define pte_hw_dirty(pte)      (pte_write(pte) && !(pte_val(pte) & PTE_RDONLY))
@@ -204,6 +213,16 @@ static inline pte_t pte_mkspecial(pte_t pte)
        return set_pte_bit(pte, __pgprot(PTE_SPECIAL));
 }
 
+static inline pte_t pte_mkcont(pte_t pte)
+{
+       return set_pte_bit(pte, __pgprot(PTE_CONT));
+}
+
+static inline pte_t pte_mknoncont(pte_t pte)
+{
+       return clear_pte_bit(pte, __pgprot(PTE_CONT));
+}
+
 static inline void set_pte(pte_t *ptep, pte_t pte)
 {
        *ptep = pte;
@@ -648,14 +667,17 @@ static inline void update_mmu_cache(struct vm_area_struct *vma,
                                    unsigned long addr, pte_t *ptep)
 {
        /*
-        * set_pte() does not have a DSB for user mappings, so make sure that
-        * the page table write is visible.
+        * We don't do anything here, so there's a very small chance of
+        * us retaking a user fault which we just fixed up. The alternative
+        * is doing a dsb(ishst), but that penalises the fastpath.
         */
-       dsb(ishst);
 }
 
 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
 
+#define kc_vaddr_to_offset(v)  ((v) & ~VA_START)
+#define kc_offset_to_vaddr(o)  ((o) | VA_START)
+
 #endif /* !__ASSEMBLY__ */
 
 #endif /* __ASM_PGTABLE_H */