arch/sparc/include/asm/mman.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __SPARC_MMAN_H__
   3 #define __SPARC_MMAN_H__
   4
   5 #include <uapi/asm/mman.h>
   6
   7 #ifndef __ASSEMBLY__
   8 #define arch_mmap_check(addr,len,flags) sparc_mmap_check(addr,len)
   9 int sparc_mmap_check(unsigned long addr, unsigned long len);
  10
  11 #ifdef CONFIG_SPARC64
  12 #include <asm/adi_64.h>
  13
  14 static inline void ipi_set_tstate_mcde(void *arg)
  15 {
  16         struct mm_struct *mm = arg;
  17
  18         /* Set TSTATE_MCDE for the task using address map that ADI has been
  19          * enabled on if the task is running. If not, it will be set
  20          * automatically at the next context switch
  21          */
  22         if (current->mm == mm) {
  23                 struct pt_regs *regs;
  24
  25                 regs = task_pt_regs(current);
  26                 regs->tstate |= TSTATE_MCDE;
  27         }
  28 }
  29
  30 #define arch_calc_vm_prot_bits(prot, pkey) sparc_calc_vm_prot_bits(prot)
  31 static inline unsigned long sparc_calc_vm_prot_bits(unsigned long prot)
  32 {
  33         if (adi_capable() && (prot & PROT_ADI)) {
  34                 struct pt_regs *regs;
  35
  36                 if (!current->mm->context.adi) {
  37                         regs = task_pt_regs(current);
  38                         regs->tstate |= TSTATE_MCDE;
  39                         current->mm->context.adi = true;
  40                         on_each_cpu_mask(mm_cpumask(current->mm),
  41                                          ipi_set_tstate_mcde, current->mm, 0);
  42                 }
  43                 return VM_SPARC_ADI;
  44         } else {
  45                 return 0;
  46         }
  47 }
  48
  49 #define arch_vm_get_page_prot(vm_flags) sparc_vm_get_page_prot(vm_flags)
  50 static inline pgprot_t sparc_vm_get_page_prot(unsigned long vm_flags)
  51 {
  52         return (vm_flags & VM_SPARC_ADI) ? __pgprot(_PAGE_MCD_4V) : __pgprot(0);
  53 }
  54
  55 #define arch_validate_prot(prot, addr) sparc_validate_prot(prot, addr)
  56 static inline int sparc_validate_prot(unsigned long prot, unsigned long addr)
  57 {
  58         if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_ADI))
  59                 return 0;
  60         if (prot & PROT_ADI) {
  61                 if (!adi_capable())
  62                         return 0;
  63
  64                 if (addr) {
  65                         struct vm_area_struct *vma;
  66
  67                         vma = find_vma(current->mm, addr);
  68                         if (vma) {
  69                                 /* ADI can not be enabled on PFN
  70                                  * mapped pages
  71                                  */
  72                                 if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
  73                                         return 0;
  74
  75                                 /* Mergeable pages can become unmergeable
  76                                  * if ADI is enabled on them even if they
  77                                  * have identical data on them. This can be
  78                                  * because ADI enabled pages with identical
  79                                  * data may still not have identical ADI
  80                                  * tags on them. Disallow ADI on mergeable
  81                                  * pages.
  82                                  */
  83                                 if (vma->vm_flags & VM_MERGEABLE)
  84                                         return 0;
  85                         }
  86                 }
  87         }
  88         return 1;
  89 }
  90 #endif /* CONFIG_SPARC64 */
  91
  92 #endif /* __ASSEMBLY__ */
  93 #endif /* __SPARC_MMAN_H__ */