Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * Copyright (C) 2012 Regents of the University of California
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #ifndef _ASM_RISCV_PGALLOC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #define _ASM_RISCV_PGALLOC_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <asm/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #ifdef CONFIG_MMU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm-generic/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) static inline void pmd_populate_kernel(struct mm_struct *mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	pmd_t *pmd, pte_t *pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	unsigned long pfn = virt_to_pfn(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static inline void pmd_populate(struct mm_struct *mm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	pmd_t *pmd, pgtable_t pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	unsigned long pfn = virt_to_pfn(page_address(pte));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #ifndef __PAGETABLE_PMD_FOLDED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	unsigned long pfn = virt_to_pfn(pmd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 	set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #endif /* __PAGETABLE_PMD_FOLDED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #define pmd_pgtable(pmd)	pmd_page(pmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static inline pgd_t *pgd_alloc(struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	pgd_t *pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	if (likely(pgd != NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 		memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		/* Copy kernel mappings */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 		memcpy(pgd + USER_PTRS_PER_PGD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 			init_mm.pgd + USER_PTRS_PER_PGD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 			(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	return pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #ifndef __PAGETABLE_PMD_FOLDED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) #define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #endif /* __PAGETABLE_PMD_FOLDED */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) #define __pte_free_tlb(tlb, pte, buf)   \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) do {                                    \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	pgtable_pte_page_dtor(pte);     \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 	tlb_remove_page((tlb), pte);    \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) #endif /* CONFIG_MMU */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) #endif /* _ASM_RISCV_PGALLOC_H */