/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 Regents of the University of California
*/
#ifndef _ASM_RISCV_PGTABLE_64_H
#define _ASM_RISCV_PGTABLE_64_H
#include <linux/bits.h>
#include <linux/const.h>
#include <asm/errata_list.h>
extern bool pgtable_l4_enabled;
extern bool pgtable_l5_enabled;
#define PGDIR_SHIFT_L3 30
#define PGDIR_SHIFT_L4 39
#define PGDIR_SHIFT_L5 48
#define PGDIR_SHIFT (pgtable_l5_enabled ? PGDIR_SHIFT_L5 : \
(pgtable_l4_enabled ? PGDIR_SHIFT_L4 : PGDIR_SHIFT_L3))
/* Size of region mapped by a page global directory */
#define PGDIR_SIZE (_AC(1, UL) << PGDIR_SHIFT)
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
/* p4d is folded into pgd in case of 4-level page table */
#define P4D_SHIFT_L3 30
#define P4D_SHIFT_L4 39
#define P4D_SHIFT_L5 39
#define P4D_SHIFT (pgtable_l5_enabled ? P4D_SHIFT_L5 : \
(pgtable_l4_enabled ? P4D_SHIFT_L4 : P4D_SHIFT_L3))
#define P4D_SIZE (_AC(1, UL) << P4D_SHIFT)
#define P4D_MASK (~(P4D_SIZE - 1))
/* pud is folded into pgd in case of 3-level page table */
#define PUD_SHIFT 30
#define PUD_SIZE (_AC(1, UL) << PUD_SHIFT)
#define PUD_MASK (~(PUD_SIZE - 1))
#define PMD_SHIFT 21
/* Size of region mapped by a page middle directory */
#define PMD_SIZE (_AC(1, UL) << PMD_SHIFT)
#define PMD_MASK (~(PMD_SIZE - 1))
/* Page 4th Directory entry */
typedef struct {
unsigned long p4d;
} p4d_t;
#define p4d_val(x) ((x).p4d)
#define __p4d(x) ((p4d_t) { (x) })
#define PTRS_PER_P4D (PAGE_SIZE / sizeof(p4d_t))
/* Page Upper Directory entry */
typedef struct {
unsigned long pud;
} pud_t;
#define pud_val(x) ((x).pud)
#define __pud(x) ((pud_t) { (x) })
#define PTRS_PER_PUD (PAGE_SIZE / sizeof(pud_t))
/* Page Middle Directory entry */
typedef struct {
unsigned long pmd;
} pmd_t;
#define pmd_val(x) ((x).pmd)
#define __pmd(x) ((pmd_t) { (x) })
#define PTRS_PER_PMD (PAGE_SIZE / sizeof(pmd_t))
/*
* rv64 PTE format:
* | 63 | 62 61 | 60 54 | 53 10 | 9 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
* N MT RSV PFN reserved for SW D A G U X W R V
*/
#define _PAGE_PFN_MASK GENMASK(53, 10)
/*
* [63] Svnapot definitions:
* 0 Svnapot disabled
* 1 Svnapot enabled
*/
#define _PAGE_NAPOT_SHIFT 63
#define _PAGE_NAPOT BIT(_PAGE_NAPOT_SHIFT)
/*
* Only 64KB (order 4) napot ptes supported.
*/
#define NAPOT_CONT_ORDER_BASE 4
enum napot_cont_order {
NAPOT_CONT64KB_ORDER = NAPOT_CONT_ORDER_BASE,
NAPOT_ORDER_MAX,
};
#define for_each_napot_order(order) \
for (order = NAPOT_CONT_ORDER_BASE; order < NAPOT_ORDER_MAX; order++)
#define for_each_napot_order_rev(order) \
for (order = NAPOT_ORDER_MAX - 1; \
order >= NAPOT_CONT_ORDER_BASE; order--)
#define napot_cont_order(val) (__builtin_ctzl((val.pte >> _PAGE_PFN_SHIFT) << 1))
#define napot_cont_shift(order) ((order) + PAGE_SHIFT)
#define napot_cont_size(order) BIT(napot_cont_shift(order))
#define napot_cont_mask(order) (~(napot_cont_size(order) - 1UL))
#define napot_pte_num(order) BIT(order)
#ifdef CONFIG_RISCV_ISA_SVNAPOT
#define HUGE_MAX_HSTATE (2 + (NAPOT_ORDER_MAX - NAPOT_CONT_ORDER_BASE))
#else
#define HUGE_MAX_HSTATE 2
#endif
/*
* [62:61] Svpbmt Memory Type definitions:
*
* 00 - PMA Normal Cacheable, No change to implied PMA memory type
* 01 - NC Non-cacheable, idempotent, weakly-ordered Main Memory
* 10 - IO Non-cacheable, non-idempotent, strongly-ordered I/O memory
* 11 - Rsvd Reserved for future standard use
*/
#define _PAGE_NOCACHE_SVPBMT (1UL << 61)
#define _PAGE_IO_SVPBMT (1UL << 62)
#define _PAGE_MTMASK_SVPBMT (_PAGE_NOCACHE_SVPBMT | _PAGE_IO_SVPBMT)
/*
* [63:59] T-Head Memory Type definitions:
* bit[63] SO - Strong Order
* bit[62] C - Cacheable
* bit[61] B - Bufferable
* bit[60] SH - Shareable
* bit[59] Sec - Trustable
* 00110 - NC Weakly-ordered, Non-cacheable, Bufferable, Shareable, Non-trustable
* 01110 - PMA Weakly-ordered, Cacheable, Bufferable, Shareable, Non-trustable
* 10010 - IO Strongly-ordered, Non-cacheable, Non-bufferable, Shareable, Non-trustable
*/
#define _PAGE_PMA_THEAD ((1UL << 62) | (1UL << 61) | (1UL << 60))
#define _PAGE_NOCACHE_THEAD ((1UL << 61) | (1UL << 60))
#define _PAGE_IO_THEAD ((1UL << 63) | (1UL << 60))
#define _PAGE_MTMASK_THEAD (_PAGE_PMA_THEAD | _PAGE_IO_THEAD | (1UL << 59))
static inline u64 riscv_page_mtmask(void)
{
u64 val;
ALT_SVPBMT(val, _PAGE_MTMASK);
return val;
}
static inline u64 riscv_page_nocache(void)
{
u64 val;
ALT_SVPBMT(val, _PAGE_NOCACHE);
return val;
}
static inline u64 riscv_page_io(void)
{
u64 val;
ALT_SVPBMT(val, _PAGE_IO);
return val;
}
#define _PAGE_NOCACHE riscv_page_nocache()
#define _PAGE_IO riscv_page_io()
#define _PAGE_MTMASK riscv_page_mtmask()
/* Set of bits to preserve across pte_modify() */
#define _PAGE_CHG_MASK (~(unsigned long)(_PAGE_PRESENT | _PAGE_READ | \
_PAGE_WRITE | _PAGE_EXEC | \
_PAGE_USER | _PAGE_GLOBAL | \
_PAGE_MTMASK))
static inline int pud_present(pud_t pud)
{
return (pud_val(pud) & _PAGE_PRESENT);
}
static inline int pud_none(pud_t pud)
{
return (pud_val(pud) == 0);
}
static inline int pud_bad(pud_t pud)
{
return !pud_present(pud);
}
#define pud_leaf pud_leaf
static inline bool pud_leaf(pud_t pud)
{
return pud_present(pud) && (pud_val(pud) & _PAGE_LEAF);
}
static inline int pud_user(pud_t pud)
{
return pud_val(pud) & _PAGE_USER;
}
static inline void set_pud(pud_t *pudp, pud_t pud)
{
WRITE_ONCE(*pudp, pud);
}
static inline void pud_clear(pud_t *pudp)
{
set_pud(pudp, __pud(0));
}
static inline pud_t pfn_pud(unsigned long pfn, pgprot_t prot)
{
return __pud((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
}
static inline unsigned long _pud_pfn(pud_t pud)
{
return __page_val_to_pfn(pud_val(pud));
}
static inline pmd_t *pud_pgtable(pud_t pud)
{
return (pmd_t *)pfn_to_virt(__page_val_to_pfn(pud_val(pud)));
}
static inline struct page *pud_page(pud_t pud)
{
return pfn_to_page(__page_val_to_pfn(pud_val(pud)));
}
#define mm_p4d_folded mm_p4d_folded
static inline bool mm_p4d_folded(struct mm_struct *mm)
{
if (pgtable_l5_enabled)
return false;
return true;
}
#define mm_pud_folded mm_pud_folded
static inline bool mm_pud_folded(struct mm_struct *mm)
{
if (pgtable_l4_enabled)
return false;
return true;
}
#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
static inline pmd_t pfn_pmd(unsigned long pfn, pgprot_t prot)
{
unsigned long prot_val = pgprot_val(prot);
ALT_THEAD_PMA(prot_val);
return __pmd((pfn << _PAGE_PFN_SHIFT) | prot_val);
}
static inline unsigned long _pmd_pfn(pmd_t pmd)
{
return __page_val_to_pfn(pmd_val(pmd));
}
#define mk_pmd(page, prot) pfn_pmd(page_to_pfn(page), prot)
#define pmd_ERROR(e) \
pr_err("%s:%d: bad pmd %016lx.\n", __FILE__, __LINE__, pmd_val(e))
#define pud_ERROR(e) \
pr_err("%s:%d: bad pud %016lx.\n", __FILE__, __LINE__, pud_val(e))
#define p4d_ERROR(e) \
pr_err("%s:%d: bad p4d %016lx.\n", __FILE__, __LINE__, p4d_val(e))
static inline void set_p4d(p4d_t *p4dp, p4d_t p4d)
{
if (pgtable_l4_enabled)
WRITE_ONCE(*p4dp, p4d);
else
set_pud((pud_t *)p4dp, (pud_t){ p4d_val(p4d) });
}
static inline int p4d_none(p4d_t p4d)
{
if (pgtable_l4_enabled)
return (p4d_val(p4d) == 0);
return 0;
}
static inline int p4d_present(p4d_t p4d)
{
if (pgtable_l4_enabled)
return (p4d_val(p4d) & _PAGE_PRESENT);
return 1;
}
static inline int p4d_bad(p4d_t p4d)
{
if (pgtable_l4_enabled)
return !p4d_present(p4d);
return 0;
}
static inline void p4d_clear(p4d_t *p4d)
{
if (pgtable_l4_enabled)
set_p4d(p4d, __p4d(0));
}
static inline p4d_t pfn_p4d(unsigned long pfn, pgprot_t prot)
{
return __p4d((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
}
static inline unsigned long _p4d_pfn(p4d_t p4d)
{
return __page_val_to_pfn(p4d_val(p4d));
}
static inline pud_t *p4d_pgtable(p4d_t p4d)
{
if (pgtable_l4_enabled)
return (pud_t *)pfn_to_virt(__page_val_to_pfn(p4d_val(p4d)));
return (pud_t *)pud_pgtable((pud_t) { p4d_val(p4d) });
}
#define p4d_page_vaddr(p4d) ((unsigned long)p4d_pgtable(p4d))
static inline struct page *p4d_page(p4d_t p4d)
{
return pfn_to_page(__page_val_to_pfn(p4d_val(p4d)));
}
#define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
#define pud_offset pud_offset
pud_t *pud_offset(p4d_t *p4d, unsigned long address);
static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
{
if (pgtable_l5_enabled)
WRITE_ONCE(*pgdp, pgd);
else
set_p4d((p4d_t *)pgdp, (p4d_t){ pgd_val(pgd) });
}
static inline int pgd_none(pgd_t pgd)
{
if (pgtable_l5_enabled)
return (pgd_val(pgd) == 0);
return 0;
}
static inline int pgd_present(pgd_t pgd)
{
if (pgtable_l5_enabled)
return (pgd_val(pgd) & _PAGE_PRESENT);
return 1;
}
static inline int pgd_bad(pgd_t pgd)
{
if (pgtable_l5_enabled)
return !pgd_present(pgd);
return 0;
}
static inline void pgd_clear(pgd_t *pgd)
{
if (pgtable_l5_enabled)
set_pgd(pgd, __pgd(0));
}
static inline p4d_t *pgd_pgtable(pgd_t pgd)
{
if (pgtable_l5_enabled)
return (p4d_t *)pfn_to_virt(__page_val_to_pfn(pgd_val(pgd)));
return (p4d_t *)p4d_pgtable((p4d_t) { pgd_val(pgd) });
}
#define pgd_page_vaddr(pgd) ((unsigned long)pgd_pgtable(pgd))
static inline struct page *pgd_page(pgd_t pgd)
{
return pfn_to_page(__page_val_to_pfn(pgd_val(pgd)));
}
#define pgd_page(pgd) pgd_page(pgd)
#define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
#define p4d_offset p4d_offset
p4d_t *p4d_offset(pgd_t *pgd, unsigned long address);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline int pte_devmap(pte_t pte);
static inline pte_t pmd_pte(pmd_t pmd);
static inline int pmd_devmap(pmd_t pmd)
{
return pte_devmap(pmd_pte(pmd));
}
static inline int pud_devmap(pud_t pud)
{
return 0;
}
static inline int pgd_devmap(pgd_t pgd)
{
return 0;
}
#endif
#endif /* _ASM_RISCV_PGTABLE_64_H */
Codebase Browser
linux