OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	11/17/2022 06:42:15 AM	rwxr-xr-x
📄 Kbuild	886 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 asm-offsets.h	35 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 atomic.h	5.27 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 bitops.h	6.62 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 cache.h	1.16 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cacheflush.h	3.8 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 checksum.h	1.61 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 cmpxchg.h	2.55 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 delay.h	978 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 dma-mapping.h	1.31 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 dma.h	934 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 elf.h	6.34 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 exec.h	1.01 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 fixmap.h	1.11 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 fpu.h	90 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 futex.h	2.25 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 hexagon_vm.h	6.39 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 intrinsics.h	1003 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 io.h	6.95 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 irq.h	1.13 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 irqflags.h	1.46 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 kgdb.h	1.36 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 linkage.h	871 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 mem-layout.h	3.42 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmu.h	1.1 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 mmu_context.h	2.59 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 module.h	910 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 page.h	4.74 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 perf_event.h	841 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 pgalloc.h	4.08 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 pgtable.h	14.15 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 processor.h	3.8 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 smp.h	1.31 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 spinlock.h	3.84 KB	11/01/2022 04:52:05 PM	rw-r--r--
📄 spinlock_types.h	1.15 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 string.h	1.08 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 suspend.h	872 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 switch_to.h	1.09 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 syscall.h	1.38 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 thread_info.h	4.05 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 time.h	980 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 timer-regs.h	1.23 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 timex.h	1.13 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 tlb.h	1.21 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 tlbflush.h	2.08 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 traps.h	1.02 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 uaccess.h	3.67 KB	01/28/2018 09:20:33 PM	rw-r--r--
📄 vdso.h	941 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 vm_fault.h	993 bytes	01/28/2018 09:20:33 PM	rw-r--r--
📄 vm_mmu.h	3.37 KB	01/28/2018 09:20:33 PM	rw-r--r--

Editing: pgalloc.h

/*
 * Page table support for the Hexagon architecture
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

#ifndef _ASM_PGALLOC_H
#define _ASM_PGALLOC_H

#include <asm/mem-layout.h>
#include <asm/atomic.h>

#define check_pgt_cache() do {} while (0)

extern unsigned long long kmap_generation;

/*
 * Page table creation interface
 */
static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd;

pgd = (pgd_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);

/*
	 * There may be better ways to do this, but to ensure
	 * that new address spaces always contain the kernel
	 * base mapping, and to ensure that the user area is
	 * initially marked invalid, initialize the new map
	 * map with a copy of the kernel's persistent map.
	 */

memcpy(pgd, swapper_pg_dir, PTRS_PER_PGD*sizeof(pgd_t));
	mm->context.generation = kmap_generation;

/* Physical version is what is passed to virtual machine on switch */
	mm->context.ptbase = __pa(pgd);

return pgd;
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	free_page((unsigned long) pgd);
}

static inline struct page *pte_alloc_one(struct mm_struct *mm,
					 unsigned long address)
{
	struct page *pte;

pte = alloc_page(GFP_KERNEL | __GFP_ZERO);
	if (!pte)
		return NULL;
	if (!pgtable_page_ctor(pte)) {
		__free_page(pte);
		return NULL;
	}
	return pte;
}

/* _kernel variant gets to use a different allocator */
static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
					  unsigned long address)
{
	gfp_t flags =  GFP_KERNEL | __GFP_ZERO;
	return (pte_t *) __get_free_page(flags);
}

static inline void pte_free(struct mm_struct *mm, struct page *pte)
{
	pgtable_page_dtor(pte);
	__free_page(pte);
}

static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
	free_page((unsigned long)pte);
}

static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
				pgtable_t pte)
{
	/*
	 * Conveniently, zero in 3 LSB means indirect 4K page table.
	 * Not so convenient when you're trying to vary the page size.
	 */
	set_pmd(pmd, __pmd(((unsigned long)page_to_pfn(pte) << PAGE_SHIFT) |
		HEXAGON_L1_PTE_SIZE));
}

/*
 * Other architectures seem to have ways of making all processes
 * share the same pmd's for their kernel mappings, but the v0.3
 * Hexagon VM spec has a "monolithic" L1 table for user and kernel
 * segments.  We track "generations" of the kernel map to minimize
 * overhead, and update the "slave" copies of the kernel mappings
 * as part of switch_mm.  However, we still need to update the
 * kernel map of the active thread who's calling pmd_populate_kernel...
 */
static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
				       pte_t *pte)
{
	extern spinlock_t kmap_gen_lock;
	pmd_t *ppmd;
	int pmdindex;

spin_lock(&kmap_gen_lock);
	kmap_generation++;
	mm->context.generation = kmap_generation;
	current->active_mm->context.generation = kmap_generation;
	spin_unlock(&kmap_gen_lock);

set_pmd(pmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE));

/*
	 * Now the "slave" copy of the current thread.
	 * This is pointer arithmetic, not byte addresses!
	 */
	pmdindex = (pgd_t *)pmd - mm->pgd;
	ppmd = (pmd_t *)current->active_mm->pgd + pmdindex;
	set_pmd(ppmd, __pmd(((unsigned long)__pa(pte)) | HEXAGON_L1_PTE_SIZE));
	if (pmdindex > max_kernel_seg)
		max_kernel_seg = pmdindex;
}

#define __pte_free_tlb(tlb, pte, addr)		\
do {						\
	pgtable_page_dtor((pte));		\
	tlb_remove_page((tlb), (pte));		\
} while (0)

#endif