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-rw-r--r--arch/riscv/include/asm/pgtable-64.h377
1 files changed, 377 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/pgtable-64.h
new file mode 100644
index 000000000..42a042c0e
--- /dev/null
+++ b/arch/riscv/include/asm/pgtable-64.h
@@ -0,0 +1,377 @@
+/* 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_SIZE_L3 (_AC(1, UL) << PGDIR_SHIFT_L3)
+
+#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)
+
+/*
+ * [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:
+ *
+ * 00000 - NC Weakly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
+ * 01110 - PMA Weakly-ordered, Cacheable, Bufferable, Shareable, Non-trustable
+ * 10000 - IO Strongly-ordered, Non-cacheable, Non-bufferable, Non-shareable, Non-trustable
+ */
+#define _PAGE_PMA_THEAD ((1UL << 62) | (1UL << 61) | (1UL << 60))
+#define _PAGE_NOCACHE_THEAD 0UL
+#define _PAGE_IO_THEAD (1UL << 63)
+#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 int 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)
+{
+ *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)
+ *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
+static inline pud_t *pud_offset(p4d_t *p4d, unsigned long address)
+{
+ if (pgtable_l4_enabled)
+ return p4d_pgtable(*p4d) + pud_index(address);
+
+ return (pud_t *)p4d;
+}
+
+static inline void set_pgd(pgd_t *pgdp, pgd_t pgd)
+{
+ if (pgtable_l5_enabled)
+ *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
+static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
+{
+ if (pgtable_l5_enabled)
+ return pgd_pgtable(*pgd) + p4d_index(address);
+
+ return (p4d_t *)pgd;
+}
+
+#endif /* _ASM_RISCV_PGTABLE_64_H */