arch/sparc/include/asm/mman.h

Source file repositories/reference/linux-study-clean/arch/sparc/include/asm/mman.h

File Facts

System
Linux kernel
Corpus path
arch/sparc/include/asm/mman.h
Extension
.h
Size
2407 bytes
Lines
92
Domain
Architecture Layer
Bucket
arch/sparc
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

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_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;
	return 1;
}

#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
/* arch_validate_flags() - Ensure combination of flags is valid for a
 *	VMA.
 */
static inline bool arch_validate_flags(vm_flags_t vm_flags)
{
	/* If ADI is being enabled on this VMA, check for ADI
	 * capability on the platform and ensure VMA is suitable
	 * for ADI
	 */
	if (vm_flags & VM_SPARC_ADI) {
		if (!adi_capable())
			return false;

		/* ADI can not be enabled on PFN mapped pages */
		if (vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
			return false;

		/* 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 (vm_flags & VM_MERGEABLE)
			return false;
	}
	return true;
}
#endif /* CONFIG_SPARC64 */

#endif /* __ASSEMBLER__ */
#endif /* __SPARC_MMAN_H__ */

Annotation

Implementation Notes