mirror of
https://github.com/torvalds/linux
synced 2024-10-03 18:00:50 +00:00
418d5dadaf
This is the order of the page table allocation, not the order of a PGD. Since its always hardwired to 0, simply drop it. [rppt@linux.ibm.com: drop extra BLANK() line in arch/loongarch/kernel/asm-offsets.c] Link: https://lkml.kernel.org/r/20220705154708.181258-13-rppt@kernel.org Link: https://lkml.kernel.org/r/20220703141203.147893-13-rppt@kernel.org Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Acked-by: Huacai Chen <chenhuacai@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Guo Ren <guoren@kernel.org> Cc: Helge Deller <deller@gmx.de> Cc: James Bottomley <James.Bottomley@HansenPartnership.com> Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Xuerui Wang <kernel@xen0n.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
131 lines
2.6 KiB
C
131 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/export.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
pgd_t *pgd_alloc(struct mm_struct *mm)
|
|
{
|
|
pgd_t *ret, *init;
|
|
|
|
ret = (pgd_t *) __get_free_page(GFP_KERNEL);
|
|
if (ret) {
|
|
init = pgd_offset(&init_mm, 0UL);
|
|
pgd_init((unsigned long)ret);
|
|
memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
|
|
(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pgd_alloc);
|
|
|
|
void pgd_init(unsigned long page)
|
|
{
|
|
unsigned long *p, *end;
|
|
unsigned long entry;
|
|
|
|
#if !defined(__PAGETABLE_PUD_FOLDED)
|
|
entry = (unsigned long)invalid_pud_table;
|
|
#elif !defined(__PAGETABLE_PMD_FOLDED)
|
|
entry = (unsigned long)invalid_pmd_table;
|
|
#else
|
|
entry = (unsigned long)invalid_pte_table;
|
|
#endif
|
|
|
|
p = (unsigned long *) page;
|
|
end = p + PTRS_PER_PGD;
|
|
|
|
do {
|
|
p[0] = entry;
|
|
p[1] = entry;
|
|
p[2] = entry;
|
|
p[3] = entry;
|
|
p[4] = entry;
|
|
p += 8;
|
|
p[-3] = entry;
|
|
p[-2] = entry;
|
|
p[-1] = entry;
|
|
} while (p != end);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pgd_init);
|
|
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
void pmd_init(unsigned long addr, unsigned long pagetable)
|
|
{
|
|
unsigned long *p, *end;
|
|
|
|
p = (unsigned long *) addr;
|
|
end = p + PTRS_PER_PMD;
|
|
|
|
do {
|
|
p[0] = pagetable;
|
|
p[1] = pagetable;
|
|
p[2] = pagetable;
|
|
p[3] = pagetable;
|
|
p[4] = pagetable;
|
|
p += 8;
|
|
p[-3] = pagetable;
|
|
p[-2] = pagetable;
|
|
p[-1] = pagetable;
|
|
} while (p != end);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pmd_init);
|
|
#endif
|
|
|
|
#ifndef __PAGETABLE_PUD_FOLDED
|
|
void pud_init(unsigned long addr, unsigned long pagetable)
|
|
{
|
|
unsigned long *p, *end;
|
|
|
|
p = (unsigned long *)addr;
|
|
end = p + PTRS_PER_PUD;
|
|
|
|
do {
|
|
p[0] = pagetable;
|
|
p[1] = pagetable;
|
|
p[2] = pagetable;
|
|
p[3] = pagetable;
|
|
p[4] = pagetable;
|
|
p += 8;
|
|
p[-3] = pagetable;
|
|
p[-2] = pagetable;
|
|
p[-1] = pagetable;
|
|
} while (p != end);
|
|
}
|
|
#endif
|
|
|
|
pmd_t mk_pmd(struct page *page, pgprot_t prot)
|
|
{
|
|
pmd_t pmd;
|
|
|
|
pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
|
|
|
|
return pmd;
|
|
}
|
|
|
|
void set_pmd_at(struct mm_struct *mm, unsigned long addr,
|
|
pmd_t *pmdp, pmd_t pmd)
|
|
{
|
|
*pmdp = pmd;
|
|
flush_tlb_all();
|
|
}
|
|
|
|
void __init pagetable_init(void)
|
|
{
|
|
/* Initialize the entire pgd. */
|
|
pgd_init((unsigned long)swapper_pg_dir);
|
|
pgd_init((unsigned long)invalid_pg_dir);
|
|
#ifndef __PAGETABLE_PUD_FOLDED
|
|
pud_init((unsigned long)invalid_pud_table, (unsigned long)invalid_pmd_table);
|
|
#endif
|
|
#ifndef __PAGETABLE_PMD_FOLDED
|
|
pmd_init((unsigned long)invalid_pmd_table, (unsigned long)invalid_pte_table);
|
|
#endif
|
|
}
|