FM / asm

/usr/src/linux-headers-5.15.0-190/arch/hexagon/include/asm/

/usr/src/linux-headers-5.15.0-190/arch/hexagon/include/asm

Name	Size	Mode	Actions
asm-offsets.h	35	0644	edit dl rm
atomic.h	4361	0644	edit dl rm
bitops.h	6152	0644	edit dl rm
cache.h	555	0644	edit dl rm
cacheflush.h	2725	0644	edit dl rm
checksum.h	685	0644	edit dl rm
cmpxchg.h	2003	0644	edit dl rm
delay.h	344	0644	edit dl rm
dma.h	300	0644	edit dl rm
elf.h	5758	0644	edit dl rm
exec.h	398	0644	edit dl rm
fixmap.h	369	0644	edit dl rm
fpu.h	90	0644	edit dl rm
futex.h	2306	0644	edit dl rm
hexagon_vm.h	5909	0644	edit dl rm
intrinsics.h	369	0644	edit dl rm
io.h	6264	0644	edit dl rm
irq.h	523	0644	edit dl rm
irqflags.h	860	0644	edit dl rm
Kbuild	131	0644	edit dl rm
kgdb.h	754	0644	edit dl rm
linkage.h	237	0644	edit dl rm
mem-layout.h	2865	0644	edit dl rm
mmu.h	490	0644	edit dl rm
mmu_context.h	1544	0644	edit dl rm
page.h	4179	0644	edit dl rm
perf_event.h	207	0644	edit dl rm
pgalloc.h	2709	0644	edit dl rm
pgtable.h	11952	0644	edit dl rm
processor.h	3173	0644	edit dl rm
smp.h	707	0644	edit dl rm
spinlock.h	3295	0644	edit dl rm
spinlock_types.h	545	0644	edit dl rm
string.h	472	0644	edit dl rm
suspend.h	238	0644	edit dl rm
switch_to.h	478	0644	edit dl rm
syscall.h	1170	0644	edit dl rm
syscalls.h	204	0644	edit dl rm
thread_info.h	3505	0644	edit dl rm
time.h	346	0644	edit dl rm
timex.h	495	0644	edit dl rm
tlb.h	253	0644	edit dl rm
tlbflush.h	1497	0644	edit dl rm
traps.h	410	0644	edit dl rm
uaccess.h	1870	0644	edit dl rm
vdso.h	307	0644	edit dl rm
vermagic.h	299	0644	edit dl rm
vmalloc.h	99	0644	edit dl rm
vm_fault.h	359	0644	edit dl rm
vm_mmu.h	2818	0644	edit dl rm

Edit: /usr/src/linux-headers-5.15.0-190/arch/hexagon/include/asm/pgalloc.h (2709B)

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Page table support for the Hexagon architecture
 *
 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
 */

#ifndef _ASM_PGALLOC_H
#define _ASM_PGALLOC_H

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

#include <asm-generic/pgalloc.h>

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 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_pte_page_dtor((pte));		\
	tlb_remove_page((tlb), (pte));		\
} while (0)

#endif

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