mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
2.5 KiB
87 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef __ASM_MMAN_H__ |
|
#define __ASM_MMAN_H__ |
|
|
|
#include <linux/compiler.h> |
|
#include <linux/types.h> |
|
#include <uapi/asm/mman.h> |
|
|
|
static inline unsigned long arch_calc_vm_prot_bits(unsigned long prot, |
|
unsigned long pkey __always_unused) |
|
{ |
|
unsigned long ret = 0; |
|
|
|
if (system_supports_bti() && (prot & PROT_BTI)) |
|
ret |= VM_ARM64_BTI; |
|
|
|
if (system_supports_mte() && (prot & PROT_MTE)) |
|
ret |= VM_MTE; |
|
|
|
return ret; |
|
} |
|
#define arch_calc_vm_prot_bits(prot, pkey) arch_calc_vm_prot_bits(prot, pkey) |
|
|
|
static inline unsigned long arch_calc_vm_flag_bits(unsigned long flags) |
|
{ |
|
/* |
|
* Only allow MTE on anonymous mappings as these are guaranteed to be |
|
* backed by tags-capable memory. The vm_flags may be overridden by a |
|
* filesystem supporting MTE (RAM-based). |
|
*/ |
|
if (system_supports_mte() && (flags & MAP_ANONYMOUS)) |
|
return VM_MTE_ALLOWED; |
|
|
|
return 0; |
|
} |
|
#define arch_calc_vm_flag_bits(flags) arch_calc_vm_flag_bits(flags) |
|
|
|
static inline pgprot_t arch_vm_get_page_prot(unsigned long vm_flags) |
|
{ |
|
pteval_t prot = 0; |
|
|
|
if (vm_flags & VM_ARM64_BTI) |
|
prot |= PTE_GP; |
|
|
|
/* |
|
* There are two conditions required for returning a Normal Tagged |
|
* memory type: (1) the user requested it via PROT_MTE passed to |
|
* mmap() or mprotect() and (2) the corresponding vma supports MTE. We |
|
* register (1) as VM_MTE in the vma->vm_flags and (2) as |
|
* VM_MTE_ALLOWED. Note that the latter can only be set during the |
|
* mmap() call since mprotect() does not accept MAP_* flags. |
|
* Checking for VM_MTE only is sufficient since arch_validate_flags() |
|
* does not permit (VM_MTE & !VM_MTE_ALLOWED). |
|
*/ |
|
if (vm_flags & VM_MTE) |
|
prot |= PTE_ATTRINDX(MT_NORMAL_TAGGED); |
|
|
|
return __pgprot(prot); |
|
} |
|
#define arch_vm_get_page_prot(vm_flags) arch_vm_get_page_prot(vm_flags) |
|
|
|
static inline bool arch_validate_prot(unsigned long prot, |
|
unsigned long addr __always_unused) |
|
{ |
|
unsigned long supported = PROT_READ | PROT_WRITE | PROT_EXEC | PROT_SEM; |
|
|
|
if (system_supports_bti()) |
|
supported |= PROT_BTI; |
|
|
|
if (system_supports_mte()) |
|
supported |= PROT_MTE; |
|
|
|
return (prot & ~supported) == 0; |
|
} |
|
#define arch_validate_prot(prot, addr) arch_validate_prot(prot, addr) |
|
|
|
static inline bool arch_validate_flags(unsigned long vm_flags) |
|
{ |
|
if (!system_supports_mte()) |
|
return true; |
|
|
|
/* only allow VM_MTE if VM_MTE_ALLOWED has been set previously */ |
|
return !(vm_flags & VM_MTE) || (vm_flags & VM_MTE_ALLOWED); |
|
} |
|
#define arch_validate_flags(vm_flags) arch_validate_flags(vm_flags) |
|
|
|
#endif /* ! __ASM_MMAN_H__ */
|
|
|