94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __SPARC_MMAN_H__
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#define __SPARC_MMAN_H__
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#include <uapi/asm/mman.h>
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#ifndef __ASSEMBLY__
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#define arch_mmap_check(addr,len,flags) sparc_mmap_check(addr,len)
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int sparc_mmap_check(unsigned long addr, unsigned long len);
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#ifdef CONFIG_SPARC64
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#include <asm/adi_64.h>
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static inline void ipi_set_tstate_mcde(void *arg)
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{
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struct mm_struct *mm = arg;
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/* Set TSTATE_MCDE for the task using address map that ADI has been
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* enabled on if the task is running. If not, it will be set
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* automatically at the next context switch
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*/
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if (current->mm == mm) {
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struct pt_regs *regs;
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regs = task_pt_regs(current);
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regs->tstate |= TSTATE_MCDE;
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}
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}
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#define arch_calc_vm_prot_bits(prot, pkey) sparc_calc_vm_prot_bits(prot)
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static inline unsigned long sparc_calc_vm_prot_bits(unsigned long prot)
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{
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if (adi_capable() && (prot & PROT_ADI)) {
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struct pt_regs *regs;
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if (!current->mm->context.adi) {
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regs = task_pt_regs(current);
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regs->tstate |= TSTATE_MCDE;
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current->mm->context.adi = true;
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on_each_cpu_mask(mm_cpumask(current->mm),
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ipi_set_tstate_mcde, current->mm, 0);
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}
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return VM_SPARC_ADI;
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} else {
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return 0;
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}
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}
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#define arch_vm_get_page_prot(vm_flags) sparc_vm_get_page_prot(vm_flags)
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static inline pgprot_t sparc_vm_get_page_prot(unsigned long vm_flags)
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{
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return (vm_flags & VM_SPARC_ADI) ? __pgprot(_PAGE_MCD_4V) : __pgprot(0);
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}
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#define arch_validate_prot(prot, addr) sparc_validate_prot(prot, addr)
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static inline int sparc_validate_prot(unsigned long prot, unsigned long addr)
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{
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if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_ADI))
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return 0;
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if (prot & PROT_ADI) {
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if (!adi_capable())
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return 0;
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if (addr) {
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struct vm_area_struct *vma;
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vma = find_vma(current->mm, addr);
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if (vma) {
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/* ADI can not be enabled on PFN
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* mapped pages
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*/
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if (vma->vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
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return 0;
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/* Mergeable pages can become unmergeable
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* if ADI is enabled on them even if they
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* have identical data on them. This can be
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* because ADI enabled pages with identical
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* data may still not have identical ADI
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* tags on them. Disallow ADI on mergeable
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* pages.
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*/
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if (vma->vm_flags & VM_MERGEABLE)
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return 0;
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}
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}
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}
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return 1;
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}
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#endif /* CONFIG_SPARC64 */
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#endif /* __ASSEMBLY__ */
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#endif /* __SPARC_MMAN_H__ */
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