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_validate_prot(prot, addr) sparc_validate_prot(prot, addr)
50static inline int sparc_validate_prot(unsigned long prot, unsigned long addr)
51{
52	if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM | PROT_ADI))
53		return 0;
54	return 1;
55}
56
57#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags)
58/* arch_validate_flags() - Ensure combination of flags is valid for a
59 *	VMA.
60 */
61static inline bool arch_validate_flags(unsigned long vm_flags)
62{
63	/* If ADI is being enabled on this VMA, check for ADI
64	 * capability on the platform and ensure VMA is suitable
65	 * for ADI
66	 */
67	if (vm_flags & VM_SPARC_ADI) {
68		if (!adi_capable())
69			return false;
70
71		/* ADI can not be enabled on PFN mapped pages */
72		if (vm_flags & (VM_PFNMAP | VM_MIXEDMAP))
73			return false;
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 (vm_flags & VM_MERGEABLE)
84			return false;
85	}
86	return true;
87}
88#endif /* CONFIG_SPARC64 */
89
90#endif /* __ASSEMBLY__ */
91#endif /* __SPARC_MMAN_H__ */
92