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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* s390x page table definitions and functions
*
* Copyright (c) 2017 Red Hat Inc
*
* Authors:
* David Hildenbrand <david@redhat.com>
*/
#ifndef _ASMS390X_PGTABLE_H_
#define _ASMS390X_PGTABLE_H_
#include <asm/page.h>
#include <alloc_page.h>
#define ASCE_ORIGIN 0xfffffffffffff000UL
#define ASCE_G 0x0000000000000200UL
#define ASCE_P 0x0000000000000100UL
#define ASCE_S 0x0000000000000080UL
#define ASCE_X 0x0000000000000040UL
#define ASCE_R 0x0000000000000020UL
#define ASCE_DT 0x000000000000000cUL
#define ASCE_TL 0x0000000000000003UL
#define ASCE_DT_REGION1 0x000000000000000cUL
#define ASCE_DT_REGION2 0x0000000000000008UL
#define ASCE_DT_REGION3 0x0000000000000004UL
#define ASCE_DT_SEGMENT 0x0000000000000000UL
#define REGION_TABLE_ORDER 2
#define REGION_TABLE_ENTRIES 2048
#define REGION_TABLE_LENGTH 3
#define REGION1_SHIFT 53
#define REGION2_SHIFT 42
#define REGION3_SHIFT 31
#define REGION_ENTRY_ORIGIN 0xfffffffffffff000UL
#define REGION_ENTRY_P 0x0000000000000200UL
#define REGION_ENTRY_TF 0x00000000000000c0UL
#define REGION_ENTRY_I 0x0000000000000020UL
#define REGION_ENTRY_TT 0x000000000000000cUL
#define REGION_ENTRY_TL 0x0000000000000003UL
#define REGION_ENTRY_TT_REGION1 0x000000000000000cUL
#define REGION_ENTRY_TT_REGION2 0x0000000000000008UL
#define REGION_ENTRY_TT_REGION3 0x0000000000000004UL
#define REGION3_ENTRY_RFAA 0xffffffff80000000UL
#define REGION3_ENTRY_AV 0x0000000000010000UL
#define REGION3_ENTRY_ACC 0x000000000000f000UL
#define REGION3_ENTRY_F 0x0000000000000800UL
#define REGION3_ENTRY_FC 0x0000000000000400UL
#define REGION3_ENTRY_IEP 0x0000000000000100UL
#define REGION3_ENTRY_CR 0x0000000000000010UL
#define SEGMENT_TABLE_ORDER 2
#define SEGMENT_TABLE_ENTRIES 2048
#define SEGMENT_TABLE_LENGTH 3
#define SEGMENT_SHIFT 20
#define SEGMENT_ENTRY_ORIGIN 0xfffffffffffff800UL
#define SEGMENT_ENTRY_SFAA 0xfffffffffff00000UL
#define SEGMENT_ENTRY_AV 0x0000000000010000UL
#define SEGMENT_ENTRY_ACC 0x000000000000f000UL
#define SEGMENT_ENTRY_F 0x0000000000000800UL
#define SEGMENT_ENTRY_FC 0x0000000000000400UL
#define SEGMENT_ENTRY_P 0x0000000000000200UL
#define SEGMENT_ENTRY_IEP 0x0000000000000100UL
#define SEGMENT_ENTRY_I 0x0000000000000020UL
#define SEGMENT_ENTRY_CS 0x0000000000000010UL
#define SEGMENT_ENTRY_TT 0x000000000000000cUL
#define SEGMENT_ENTRY_TT_REGION1 0x000000000000000cUL
#define SEGMENT_ENTRY_TT_REGION2 0x0000000000000008UL
#define SEGMENT_ENTRY_TT_REGION3 0x0000000000000004UL
#define SEGMENT_ENTRY_TT_SEGMENT 0x0000000000000000UL
#define PAGE_TABLE_ORDER 0
#define PAGE_TABLE_ENTRIES 256
#define PAGE_ENTRY_I 0x0000000000000400UL
#define PAGE_ENTRY_P 0x0000000000000200UL
#define PAGE_ENTRY_IEP 0x0000000000000100UL
#define PTRS_PER_PGD REGION_TABLE_ENTRIES
#define PTRS_PER_P4D REGION_TABLE_ENTRIES
#define PTRS_PER_PUD REGION_TABLE_ENTRIES
#define PTRS_PER_PMD SEGMENT_TABLE_ENTRIES
#define PTRS_PER_PTE PAGE_TABLE_ENTRIES
#define PGDIR_SHIFT REGION1_SHIFT
#define P4D_SHIFT REGION2_SHIFT
#define PUD_SHIFT REGION3_SHIFT
#define PMD_SHIFT SEGMENT_SHIFT
#define pgd_none(entry) (pgd_val(entry) & REGION_ENTRY_I)
#define p4d_none(entry) (p4d_val(entry) & REGION_ENTRY_I)
#define pud_none(entry) (pud_val(entry) & REGION_ENTRY_I)
#define pmd_none(entry) (pmd_val(entry) & SEGMENT_ENTRY_I)
#define pte_none(entry) (pte_val(entry) & PAGE_ENTRY_I)
#define pud_huge(entry) (pud_val(entry) & REGION3_ENTRY_FC)
#define pmd_large(entry) (pmd_val(entry) & SEGMENT_ENTRY_FC)
#define pgd_addr(entry) __va(pgd_val(entry) & REGION_ENTRY_ORIGIN)
#define p4d_addr(entry) __va(p4d_val(entry) & REGION_ENTRY_ORIGIN)
#define pud_addr(entry) __va(pud_val(entry) & REGION_ENTRY_ORIGIN)
#define pmd_addr(entry) __va(pmd_val(entry) & SEGMENT_ENTRY_ORIGIN)
#define pte_addr(entry) __va(pte_val(entry) & PAGE_MASK)
#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
#define p4d_index(addr) (((addr) >> P4D_SHIFT) & (PTRS_PER_P4D - 1))
#define pud_index(addr) (((addr) >> PUD_SHIFT) & (PTRS_PER_PUD - 1))
#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pgd_offset(table, addr) ((pgd_t *)(table) + pgd_index(addr))
#define p4d_offset(pgd, addr) ((p4d_t *)pgd_addr(*(pgd)) + p4d_index(addr))
#define pud_offset(p4d, addr) ((pud_t *)p4d_addr(*(p4d)) + pud_index(addr))
#define pmd_offset(pud, addr) ((pmd_t *)pud_addr(*(pud)) + pmd_index(addr))
#define pte_offset(pmd, addr) ((pte_t *)pmd_addr(*(pmd)) + pte_index(addr))
static inline pgd_t *pgd_alloc_one(void)
{
pgd_t *pgd = alloc_pages(REGION_TABLE_ORDER);
int i;
for (i = 0; i < REGION_TABLE_ENTRIES; i++)
pgd_val(pgd[i]) = REGION_ENTRY_TT_REGION1 | REGION_ENTRY_I;
return pgd;
}
static inline p4d_t *p4d_alloc_one(void)
{
p4d_t *p4d = alloc_pages(REGION_TABLE_ORDER);
int i;
for (i = 0; i < REGION_TABLE_ENTRIES; i++)
p4d_val(p4d[i]) = REGION_ENTRY_TT_REGION2 | REGION_ENTRY_I;
return p4d;
}
static inline p4d_t *p4d_alloc(pgd_t *pgd, unsigned long addr)
{
if (pgd_none(*pgd)) {
p4d_t *p4d = p4d_alloc_one();
pgd_val(*pgd) = __pa(p4d) | REGION_ENTRY_TT_REGION1 |
REGION_ENTRY_TL;
}
return p4d_offset(pgd, addr);
}
static inline pud_t *pud_alloc_one(void)
{
pud_t *pud = alloc_pages(REGION_TABLE_ORDER);
int i;
for (i = 0; i < REGION_TABLE_ENTRIES; i++)
pud_val(pud[i]) = REGION_ENTRY_TT_REGION3 | REGION_ENTRY_I;
return pud;
}
static inline pud_t *pud_alloc(p4d_t *p4d, unsigned long addr)
{
if (p4d_none(*p4d)) {
pud_t *pud = pud_alloc_one();
p4d_val(*p4d) = __pa(pud) | REGION_ENTRY_TT_REGION2 |
REGION_ENTRY_TL;
}
return pud_offset(p4d, addr);
}
static inline pmd_t *pmd_alloc_one(void)
{
pmd_t *pmd = alloc_pages(SEGMENT_TABLE_ORDER);
int i;
for (i = 0; i < SEGMENT_TABLE_ENTRIES; i++)
pmd_val(pmd[i]) = SEGMENT_ENTRY_TT_SEGMENT | SEGMENT_ENTRY_I;
return pmd;
}
static inline pmd_t *pmd_alloc(pud_t *pud, unsigned long addr)
{
if (pud_none(*pud)) {
pmd_t *pmd = pmd_alloc_one();
pud_val(*pud) = __pa(pmd) | REGION_ENTRY_TT_REGION3 |
REGION_ENTRY_TL;
}
return pmd_offset(pud, addr);
}
static inline pte_t *pte_alloc_one(void)
{
pte_t *pte = alloc_pages(PAGE_TABLE_ORDER);
int i;
for (i = 0; i < PAGE_TABLE_ENTRIES; i++)
pte_val(pte[i]) = PAGE_ENTRY_I;
return pte;
}
static inline pte_t *pte_alloc(pmd_t *pmd, unsigned long addr)
{
if (pmd_none(*pmd)) {
pte_t *pte = pte_alloc_one();
pmd_val(*pmd) = __pa(pte) | SEGMENT_ENTRY_TT_SEGMENT;
}
return pte_offset(pmd, addr);
}
static inline void ipte(unsigned long vaddr, pteval_t *p_pte)
{
unsigned long table_origin = (unsigned long)p_pte;
asm volatile(
" ipte %0,%1\n"
: : "a" (table_origin), "a" (vaddr) : "memory");
}
static inline void idte(unsigned long table_origin, unsigned long vaddr)
{
vaddr &= SEGMENT_ENTRY_SFAA;
asm volatile(
" idte %0,0,%1\n"
: : "a" (table_origin), "a" (vaddr) : "memory");
}
static inline void idte_pmdp(unsigned long vaddr, pmdval_t *pmdp)
{
idte((unsigned long)(pmdp - pmd_index(vaddr)) | ASCE_DT_SEGMENT, vaddr);
}
static inline void idte_pudp(unsigned long vaddr, pudval_t *pudp)
{
idte((unsigned long)(pudp - pud_index(vaddr)) | ASCE_DT_REGION3, vaddr);
}
static inline void idte_p4dp(unsigned long vaddr, p4dval_t *p4dp)
{
idte((unsigned long)(p4dp - p4d_index(vaddr)) | ASCE_DT_REGION2, vaddr);
}
static inline void idte_pgdp(unsigned long vaddr, pgdval_t *pgdp)
{
idte((unsigned long)(pgdp - pgd_index(vaddr)) | ASCE_DT_REGION1, vaddr);
}
#endif /* _ASMS390X_PGTABLE_H_ */