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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_BOOK3S_64_HASH_4K_H
#define _ASM_POWERPC_BOOK3S_64_HASH_4K_H
#define H_PTE_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 4KB = 2MB
#define H_PMD_INDEX_SIZE 7 // size: 8B << 7 = 1KB, maps: 2^7 x 2MB = 256MB
#define H_PUD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 256MB = 128GB
#define H_PGD_INDEX_SIZE 9 // size: 8B << 9 = 4KB, maps: 2^9 x 128GB = 64TB
/*
* Each context is 512TB. But on 4k we restrict our max TASK size to 64TB
* Hence also limit max EA bits to 64TB.
*/
#define MAX_EA_BITS_PER_CONTEXT 46
#define REGION_SHIFT (MAX_EA_BITS_PER_CONTEXT - 2)
/*
* Our page table limit us to 64TB. Hence for the kernel mapping,
* each MAP area is limited to 16 TB.
* The four map areas are: linear mapping, vmap, IO and vmemmap
*/
#define H_KERN_MAP_SIZE (ASM_CONST(1) << REGION_SHIFT)
/*
* Define the address range of the kernel non-linear virtual area
* 16TB
*/
#define H_KERN_VIRT_START ASM_CONST(0xc000100000000000)
#ifndef __ASSEMBLY__
#define H_PTE_TABLE_SIZE (sizeof(pte_t) << H_PTE_INDEX_SIZE)
#define H_PMD_TABLE_SIZE (sizeof(pmd_t) << H_PMD_INDEX_SIZE)
#define H_PUD_TABLE_SIZE (sizeof(pud_t) << H_PUD_INDEX_SIZE)
#define H_PGD_TABLE_SIZE (sizeof(pgd_t) << H_PGD_INDEX_SIZE)
#define H_PAGE_F_GIX_SHIFT 53
#define H_PAGE_F_SECOND _RPAGE_RPN44 /* HPTE is in 2ndary HPTEG */
#define H_PAGE_F_GIX (_RPAGE_RPN43 | _RPAGE_RPN42 | _RPAGE_RPN41)
#define H_PAGE_BUSY _RPAGE_RSV1 /* software: PTE & hash are busy */
#define H_PAGE_HASHPTE _RPAGE_RSV2 /* software: PTE & hash are busy */
/* PTE flags to conserve for HPTE identification */
#define _PAGE_HPTEFLAGS (H_PAGE_BUSY | H_PAGE_HASHPTE | \
H_PAGE_F_SECOND | H_PAGE_F_GIX)
/*
* Not supported by 4k linux page size
*/
#define H_PAGE_4K_PFN 0x0
#define H_PAGE_THP_HUGE 0x0
#define H_PAGE_COMBO 0x0
/* 8 bytes per each pte entry */
#define H_PTE_FRAG_SIZE_SHIFT (H_PTE_INDEX_SIZE + 3)
#define H_PTE_FRAG_NR (PAGE_SIZE >> H_PTE_FRAG_SIZE_SHIFT)
#define H_PMD_FRAG_SIZE_SHIFT (H_PMD_INDEX_SIZE + 3)
#define H_PMD_FRAG_NR (PAGE_SIZE >> H_PMD_FRAG_SIZE_SHIFT)
/* memory key bits, only 8 keys supported */
#define H_PTE_PKEY_BIT0 0
#define H_PTE_PKEY_BIT1 0
#define H_PTE_PKEY_BIT2 _RPAGE_RSV3
#define H_PTE_PKEY_BIT3 _RPAGE_RSV4
#define H_PTE_PKEY_BIT4 _RPAGE_RSV5
/*
* On all 4K setups, remap_4k_pfn() equates to remap_pfn_range()
*/
#define remap_4k_pfn(vma, addr, pfn, prot) \
remap_pfn_range((vma), (addr), (pfn), PAGE_SIZE, (prot))
#ifdef CONFIG_HUGETLB_PAGE
static inline int hash__hugepd_ok(hugepd_t hpd)
{
unsigned long hpdval = hpd_val(hpd);
/*
* if it is not a pte and have hugepd shift mask
* set, then it is a hugepd directory pointer
*/
if (!(hpdval & _PAGE_PTE) && (hpdval & _PAGE_PRESENT) &&
((hpdval & HUGEPD_SHIFT_MASK) != 0))
return true;
return false;
}
#endif
/*
* 4K PTE format is different from 64K PTE format. Saving the hash_slot is just
* a matter of returning the PTE bits that need to be modified. On 64K PTE,
* things are a little more involved and hence needs many more parameters to
* accomplish the same. However we want to abstract this out from the caller by
* keeping the prototype consistent across the two formats.
*/
static inline unsigned long pte_set_hidx(pte_t *ptep, real_pte_t rpte,
unsigned int subpg_index, unsigned long hidx,
int offset)
{
return (hidx << H_PAGE_F_GIX_SHIFT) &
(H_PAGE_F_SECOND | H_PAGE_F_GIX);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline char *get_hpte_slot_array(pmd_t *pmdp)
{
BUG();
return NULL;
}
static inline unsigned int hpte_valid(unsigned char *hpte_slot_array, int index)
{
BUG();
return 0;
}
static inline unsigned int hpte_hash_index(unsigned char *hpte_slot_array,
int index)
{
BUG();
return 0;
}
static inline void mark_hpte_slot_valid(unsigned char *hpte_slot_array,
unsigned int index, unsigned int hidx)
{
BUG();
}
static inline int hash__pmd_trans_huge(pmd_t pmd)
{
return 0;
}
static inline int hash__pmd_same(pmd_t pmd_a, pmd_t pmd_b)
{
BUG();
return 0;
}
static inline pmd_t hash__pmd_mkhuge(pmd_t pmd)
{
BUG();
return pmd;
}
extern unsigned long hash__pmd_hugepage_update(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp,
unsigned long clr, unsigned long set);
extern pmd_t hash__pmdp_collapse_flush(struct vm_area_struct *vma,
unsigned long address, pmd_t *pmdp);
extern void hash__pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp,
pgtable_t pgtable);
extern pgtable_t hash__pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp);
extern pmd_t hash__pmdp_huge_get_and_clear(struct mm_struct *mm,
unsigned long addr, pmd_t *pmdp);
extern int hash__has_transparent_hugepage(void);
#endif
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_POWERPC_BOOK3S_64_HASH_4K_H */
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