LXR linux/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)
   9int sparc_mmap_check(unsigned long addr, unsigned long len);
  10
  11#ifdef CONFIG_SPARC64
  12#include <asm/adi_64.h>
  13
  14static 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)
  31static 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)
  50static 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)
  56static 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        return 1;
  61}
  62
  63#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
  64/* arch_validate_flags() - Ensure combination of flags is valid for a
  65 *      VMA.
  66 */
  67static inline bool arch_validate_flags(unsigned long vm_flags)
  68{
  69        /* If ADI is being enabled on this VMA, check for ADI
  70         * capability on the platform and ensure VMA is suitable
  71         * for ADI
  72         */
  73        if (vm_flags & VM_SPARC_ADI) {
  74                if (!adi_capable())
  75                        return false;
  76
  77                /* ADI can not be enabled on PFN mapped pages */
  78                if (vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
  79                        return false;
  80
  81                /* Mergeable pages can become unmergeable
  82                 * if ADI is enabled on them even if they
  83                 * have identical data on them. This can be
  84                 * because ADI enabled pages with identical
  85                 * data may still not have identical ADI
  86                 * tags on them. Disallow ADI on mergeable
  87                 * pages.
  88                 */
  89                if (vm_flags & VM_MERGEABLE)
  90                        return false;
  91        }
  92        return true;
  93}
  94#endif /* CONFIG_SPARC64 */
  95
  96#endif /* __ASSEMBLY__ */
  97#endif /* __SPARC_MMAN_H__ */
  98