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