^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * This file contains the routines setting up the linux page tables.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (C) 2008 Michal Simek
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 2008 PetaLogix
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Copyright (C) 2007 Xilinx, Inc. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Derived from arch/ppc/mm/pgtable.c:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * -- paulus
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Derived from arch/ppc/mm/init.c:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * and Cort Dougan (PReP) (cort@cs.nmt.edu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * Copyright (C) 1996 Paul Mackerras
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Amiga/APUS changes by Jesper Skov (jskov@cygnus.co.uk).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Derived from "arch/i386/mm/init.c"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * This file is subject to the terms and conditions of the GNU General
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Public License. See the file COPYING in the main directory of this
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * archive for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/vmalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/mm_types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/pgtable.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <asm/pgalloc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include <asm/mmu.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include <asm/sections.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <asm/fixmap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) unsigned long ioremap_base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) unsigned long ioremap_bot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) EXPORT_SYMBOL(ioremap_bot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) static void __iomem *__ioremap(phys_addr_t addr, unsigned long size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) unsigned long flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) unsigned long v, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) phys_addr_t p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * Choose an address to map it to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * Once the vmalloc system is running, we use it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * Before then, we use space going down from ioremap_base
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * (ioremap_bot records where we're up to).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) p = addr & PAGE_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) size = PAGE_ALIGN(addr + size) - p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) * Don't allow anybody to remap normal RAM that we're using.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) * mem_init() sets high_memory so only do the check after that.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) * However, allow remap of rootfs: TBD
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) if (mem_init_done &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) p >= memory_start && p < virt_to_phys(high_memory) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) !(p >= __virt_to_phys((phys_addr_t)__bss_stop) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) p < __virt_to_phys((phys_addr_t)__bss_stop))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) pr_warn("__ioremap(): phys addr "PTE_FMT" is RAM lr %ps\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) (unsigned long)p, __builtin_return_address(0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) if (size == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) * Is it already mapped? If the whole area is mapped then we're
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) * done, otherwise remap it since we want to keep the virt addrs for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) * each request contiguous.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * We make the assumption here that if the bottom and top
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * of the range we want are mapped then it's mapped to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * same virt address (and this is contiguous).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * -- Cort
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) if (mem_init_done) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) struct vm_struct *area;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) area = get_vm_area(size, VM_IOREMAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (area == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) v = (unsigned long) area->addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) v = (ioremap_bot -= size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) if ((flags & _PAGE_PRESENT) == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) flags |= _PAGE_KERNEL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (flags & _PAGE_NO_CACHE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) flags |= _PAGE_GUARDED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) for (i = 0; i < size && err == 0; i += PAGE_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) err = map_page(v + i, p + i, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (mem_init_done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) vfree((void *)v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) void __iomem *ioremap(phys_addr_t addr, unsigned long size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return __ioremap(addr, size, _PAGE_NO_CACHE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) EXPORT_SYMBOL(ioremap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) void iounmap(volatile void __iomem *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) if ((__force void *)addr > high_memory &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) (unsigned long) addr < ioremap_bot)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) vfree((void *) (PAGE_MASK & (unsigned long) addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) EXPORT_SYMBOL(iounmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) int map_page(unsigned long va, phys_addr_t pa, int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) p4d_t *p4d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) pmd_t *pd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) pte_t *pg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) int err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) /* Use upper 10 bits of VA to index the first level map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) p4d = p4d_offset(pgd_offset_k(va), va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) pud = pud_offset(p4d, va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) pd = pmd_offset(pud, va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) /* Use middle 10 bits of VA to index the second-level map */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) pg = pte_alloc_kernel(pd, va); /* from powerpc - pgtable.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /* pg = pte_alloc_kernel(&init_mm, pd, va); */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) if (pg != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) __pgprot(flags)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (unlikely(mem_init_done))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) _tlbie(va);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) * Map in all of physical memory starting at CONFIG_KERNEL_START.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) void __init mapin_ram(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) unsigned long v, p, s, f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) v = CONFIG_KERNEL_START;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) p = memory_start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) for (s = 0; s < lowmem_size; s += PAGE_SIZE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) f = _PAGE_PRESENT | _PAGE_ACCESSED |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) _PAGE_SHARED | _PAGE_HWEXEC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) if ((char *) v < _stext || (char *) v >= _etext)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) f |= _PAGE_WRENABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) /* On the MicroBlaze, no user access
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) forces R/W kernel access */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) f |= _PAGE_USER;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) map_page(v, p, f);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) v += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) p += PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) /* is x a power of 2? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) #define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) /* Scan the real Linux page tables and return a PTE pointer for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * a virtual address in a context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * Returns true (1) if PTE was found, zero otherwise. The pointer to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) * the PTE pointer is unmodified if PTE is not found.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) static int get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) pgd_t *pgd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) p4d_t *p4d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) pud_t *pud;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) pmd_t *pmd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) int retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) pgd = pgd_offset(mm, addr & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) if (pgd) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) p4d = p4d_offset(pgd, addr & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) pud = pud_offset(p4d, addr & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) pmd = pmd_offset(pud, addr & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) if (pmd_present(*pmd)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) pte = pte_offset_kernel(pmd, addr & PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) if (pte) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) retval = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) *ptep = pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) /* Find physical address for this virtual address. Normally used by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) * I/O functions, but anyone can call it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) unsigned long iopa(unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) unsigned long pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct mm_struct *mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) /* Allow mapping of user addresses (within the thread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) * for DMA if necessary.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) if (addr < TASK_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) mm = current->mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) mm = &init_mm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) pa = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) if (get_pteptr(mm, addr, &pte))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) pa = (pte_val(*pte) & PAGE_MASK) | (addr & ~PAGE_MASK);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return pa;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) __ref pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) pte_t *pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) if (mem_init_done) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) pte = (pte_t *)early_get_page();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (pte)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) clear_page(pte);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return pte;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) unsigned long address = __fix_to_virt(idx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) if (idx >= __end_of_fixed_addresses)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) BUG();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) map_page(address, phys, pgprot_val(flags));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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