cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mman.h (2411B)

      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__ */