^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/highmem.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/smp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/memblock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <asm/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) static pte_t *kmap_pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) unsigned long highstart_pfn, highend_pfn;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) void kmap_flush_tlb(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) flush_tlb_one(addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) EXPORT_SYMBOL(kmap_flush_tlb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int idx, type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) type = kmap_atomic_idx_push();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) idx = type + KM_TYPE_NR*smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #ifdef CONFIG_DEBUG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) BUG_ON(!pte_none(*(kmap_pte - idx)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) set_pte(kmap_pte-idx, mk_pte(page, prot));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) flush_tlb_one((unsigned long)vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) return (void *)vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) EXPORT_SYMBOL(kmap_atomic_high_prot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) void kunmap_atomic_high(void *kvaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) int idx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) if (vaddr < FIXADDR_START)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #ifdef CONFIG_DEBUG_HIGHMEM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) idx = KM_TYPE_NR*smp_processor_id() + kmap_atomic_idx();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) pte_clear(&init_mm, vaddr, kmap_pte - idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) flush_tlb_one(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) (void) idx; /* to kill a warning */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) kmap_atomic_idx_pop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) EXPORT_SYMBOL(kunmap_atomic_high);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) * This is the same as kmap_atomic() but can map memory that doesn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * have a struct page associated with it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) void *kmap_atomic_pfn(unsigned long pfn)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) int idx, type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) pagefault_disable();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) type = kmap_atomic_idx_push();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) idx = type + KM_TYPE_NR*smp_processor_id();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) flush_tlb_one(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return (void *) vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static void __init kmap_pages_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) pgd_t *pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) vaddr = PKMAP_BASE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) fixrange_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, swapper_pg_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) pgd = swapper_pg_dir + pgd_index(vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) pud = (pud_t *)pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) pmd = pmd_offset(pud, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) pte = pte_offset_kernel(pmd, vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) pkmap_page_table = pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) void __init kmap_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) unsigned long vaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) kmap_pages_init();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) vaddr = __fix_to_virt(FIX_KMAP_BEGIN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) kmap_pte = pte_offset_kernel((pmd_t *)pgd_offset_k(vaddr), vaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags