Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * License.  See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * Copyright (C) 2003 by Ralf Baechle
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <asm/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) void pgd_init(unsigned long page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	unsigned long *p = (unsigned long *) page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	for (i = 0; i < USER_PTRS_PER_PGD; i+=8) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		p[i + 0] = (unsigned long) invalid_pte_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		p[i + 1] = (unsigned long) invalid_pte_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		p[i + 2] = (unsigned long) invalid_pte_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		p[i + 3] = (unsigned long) invalid_pte_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		p[i + 4] = (unsigned long) invalid_pte_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		p[i + 5] = (unsigned long) invalid_pte_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		p[i + 6] = (unsigned long) invalid_pte_table;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		p[i + 7] = (unsigned long) invalid_pte_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) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #if defined(CONFIG_TRANSPARENT_HUGEPAGE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) pmd_t mk_pmd(struct page *page, pgprot_t prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 	pmd_t pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	pmd_val(pmd) = (page_to_pfn(page) << _PFN_SHIFT) | pgprot_val(prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	return pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) void set_pmd_at(struct mm_struct *mm, unsigned long addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 		pmd_t *pmdp, pmd_t pmd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	*pmdp = pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	flush_tlb_all();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #endif /* defined(CONFIG_TRANSPARENT_HUGEPAGE) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) void __init pagetable_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 	pgd_t *pgd_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	pgd_t *pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	p4d_t *p4d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	/* Initialize the entire pgd.  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	pgd_init((unsigned long)swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	pgd_init((unsigned long)swapper_pg_dir
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 		 + sizeof(pgd_t) * USER_PTRS_PER_PGD);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) 	pgd_base = swapper_pg_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 	 * Fixed mappings:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	fixrange_init(vaddr & PMD_MASK, vaddr + FIXADDR_SIZE, pgd_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) #ifdef CONFIG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) 	 * Permanent kmaps:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) 	vaddr = PKMAP_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) 	fixrange_init(vaddr & PMD_MASK, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) 	pgd = swapper_pg_dir + pgd_index(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) 	p4d = p4d_offset(pgd, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) 	pud = pud_offset(p4d, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) 	pmd = pmd_offset(pud, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) 	pte = pte_offset_kernel(pmd, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) 	pkmap_page_table = pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) }