Linus Torvalds 7b82e90411 asm-generic updates for 6.5
These are cleanups for architecture specific header files:
 
  - the comments in include/linux/syscalls.h have gone out of sync
    and are really pointless, so these get removed
 
  - The asm/bitsperlong.h header no longer needs to be architecture
    specific on modern compilers, so use a generic version for newer
    architectures that use new enough userspace compilers
 
  - A cleanup for virt_to_pfn/virt_to_bus to have proper type
    checking, forcing the use of pointers
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Merge tag 'asm-generic-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pull asm-generic updates from Arnd Bergmann:
 "These are cleanups for architecture specific header files:

   - the comments in include/linux/syscalls.h have gone out of sync and
     are really pointless, so these get removed

   - The asm/bitsperlong.h header no longer needs to be architecture
     specific on modern compilers, so use a generic version for newer
     architectures that use new enough userspace compilers

   - A cleanup for virt_to_pfn/virt_to_bus to have proper type checking,
     forcing the use of pointers"

* tag 'asm-generic-6.5' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  syscalls: Remove file path comments from headers
  tools arch: Remove uapi bitsperlong.h of hexagon and microblaze
  asm-generic: Unify uapi bitsperlong.h for arm64, riscv and loongarch
  m68k/mm: Make pfn accessors static inlines
  arm64: memory: Make virt_to_pfn() a static inline
  ARM: mm: Make virt_to_pfn() a static inline
  asm-generic/page.h: Make pfn accessors static inlines
  xen/netback: Pass (void *) to virt_to_page()
  netfs: Pass a pointer to virt_to_page()
  cifs: Pass a pointer to virt_to_page() in cifsglob
  cifs: Pass a pointer to virt_to_page()
  riscv: mm: init: Pass a pointer to virt_to_page()
  ARC: init: Pass a pointer to virt_to_pfn() in init
  m68k: Pass a pointer to virt_to_pfn() virt_to_page()
  fs/proc/kcore.c: Pass a pointer to virt_addr_valid()
2023-07-06 10:06:04 -07:00

283 lines
7.6 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Based upon linux/arch/m68k/mm/sun3mmu.c
* Based upon linux/arch/ppc/mm/mmu_context.c
*
* Implementations of mm routines specific to the Coldfire MMU.
*
* Copyright (c) 2008 Freescale Semiconductor, Inc.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/memblock.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/mmu_context.h>
#include <asm/mcf_pgalloc.h>
#include <asm/tlbflush.h>
#include <asm/pgalloc.h>
#define KMAPAREA(x) ((x >= VMALLOC_START) && (x < KMAP_END))
mm_context_t next_mmu_context;
unsigned long context_map[LAST_CONTEXT / BITS_PER_LONG + 1];
atomic_t nr_free_contexts;
struct mm_struct *context_mm[LAST_CONTEXT+1];
unsigned long num_pages;
/*
* ColdFire paging_init derived from sun3.
*/
void __init paging_init(void)
{
pgd_t *pg_dir;
pte_t *pg_table;
unsigned long address, size;
unsigned long next_pgtable, bootmem_end;
unsigned long max_zone_pfn[MAX_NR_ZONES] = { 0 };
int i;
empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
if (!empty_zero_page)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, PAGE_SIZE, PAGE_SIZE);
pg_dir = swapper_pg_dir;
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
size = num_pages * sizeof(pte_t);
size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
next_pgtable = (unsigned long) memblock_alloc(size, PAGE_SIZE);
if (!next_pgtable)
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
__func__, size, PAGE_SIZE);
bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
address = PAGE_OFFSET;
while (address < (unsigned long)high_memory) {
pg_table = (pte_t *) next_pgtable;
next_pgtable += PTRS_PER_PTE * sizeof(pte_t);
pgd_val(*pg_dir) = (unsigned long) pg_table;
pg_dir++;
/* now change pg_table to kernel virtual addresses */
for (i = 0; i < PTRS_PER_PTE; ++i, ++pg_table) {
pte_t pte = pfn_pte(virt_to_pfn((void *)address),
PAGE_INIT);
if (address >= (unsigned long) high_memory)
pte_val(pte) = 0;
set_pte(pg_table, pte);
address += PAGE_SIZE;
}
}
current->mm = NULL;
max_zone_pfn[ZONE_DMA] = PFN_DOWN(_ramend);
free_area_init(max_zone_pfn);
}
int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word)
{
unsigned long flags, mmuar, mmutr;
struct mm_struct *mm;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte = NULL;
int ret = -1;
int asid;
local_irq_save(flags);
mmuar = (dtlb) ? mmu_read(MMUAR) :
regs->pc + (extension_word * sizeof(long));
mm = (!user_mode(regs) && KMAPAREA(mmuar)) ? &init_mm : current->mm;
if (!mm)
goto out;
pgd = pgd_offset(mm, mmuar);
if (pgd_none(*pgd))
goto out;
p4d = p4d_offset(pgd, mmuar);
if (p4d_none(*p4d))
goto out;
pud = pud_offset(p4d, mmuar);
if (pud_none(*pud))
goto out;
pmd = pmd_offset(pud, mmuar);
if (pmd_none(*pmd))
goto out;
pte = (KMAPAREA(mmuar)) ? pte_offset_kernel(pmd, mmuar)
: pte_offset_map(pmd, mmuar);
if (!pte || pte_none(*pte) || !pte_present(*pte))
goto out;
if (write) {
if (!pte_write(*pte))
goto out;
set_pte(pte, pte_mkdirty(*pte));
}
set_pte(pte, pte_mkyoung(*pte));
asid = mm->context & 0xff;
if (!pte_dirty(*pte) && !KMAPAREA(mmuar))
set_pte(pte, pte_wrprotect(*pte));
mmutr = (mmuar & PAGE_MASK) | (asid << MMUTR_IDN) | MMUTR_V;
if ((mmuar < TASK_UNMAPPED_BASE) || (mmuar >= TASK_SIZE))
mmutr |= (pte->pte & CF_PAGE_MMUTR_MASK) >> CF_PAGE_MMUTR_SHIFT;
mmu_write(MMUTR, mmutr);
mmu_write(MMUDR, (pte_val(*pte) & PAGE_MASK) |
((pte->pte) & CF_PAGE_MMUDR_MASK) | MMUDR_SZ_8KB | MMUDR_X);
if (dtlb)
mmu_write(MMUOR, MMUOR_ACC | MMUOR_UAA);
else
mmu_write(MMUOR, MMUOR_ITLB | MMUOR_ACC | MMUOR_UAA);
ret = 0;
out:
if (pte && !KMAPAREA(mmuar))
pte_unmap(pte);
local_irq_restore(flags);
return ret;
}
void __init cf_bootmem_alloc(void)
{
unsigned long memstart;
/* _rambase and _ramend will be naturally page aligned */
m68k_memory[0].addr = _rambase;
m68k_memory[0].size = _ramend - _rambase;
memblock_add_node(m68k_memory[0].addr, m68k_memory[0].size, 0,
MEMBLOCK_NONE);
/* compute total pages in system */
num_pages = PFN_DOWN(_ramend - _rambase);
/* page numbers */
memstart = PAGE_ALIGN(_ramstart);
min_low_pfn = PFN_DOWN(_rambase);
max_pfn = max_low_pfn = PFN_DOWN(_ramend);
high_memory = (void *)_ramend;
/* Reserve kernel text/data/bss */
memblock_reserve(_rambase, memstart - _rambase);
m68k_virt_to_node_shift = fls(_ramend - 1) - 6;
module_fixup(NULL, __start_fixup, __stop_fixup);
/* setup node data */
m68k_setup_node(0);
}
/*
* Initialize the context management stuff.
* The following was taken from arch/ppc/mmu_context.c
*/
void __init cf_mmu_context_init(void)
{
/*
* Some processors have too few contexts to reserve one for
* init_mm, and require using context 0 for a normal task.
* Other processors reserve the use of context zero for the kernel.
* This code assumes FIRST_CONTEXT < 32.
*/
context_map[0] = (1 << FIRST_CONTEXT) - 1;
next_mmu_context = FIRST_CONTEXT;
atomic_set(&nr_free_contexts, LAST_CONTEXT - FIRST_CONTEXT + 1);
}
/*
* Steal a context from a task that has one at the moment.
* This isn't an LRU system, it just frees up each context in
* turn (sort-of pseudo-random replacement :). This would be the
* place to implement an LRU scheme if anyone was motivated to do it.
* -- paulus
*/
void steal_context(void)
{
struct mm_struct *mm;
/*
* free up context `next_mmu_context'
* if we shouldn't free context 0, don't...
*/
if (next_mmu_context < FIRST_CONTEXT)
next_mmu_context = FIRST_CONTEXT;
mm = context_mm[next_mmu_context];
flush_tlb_mm(mm);
destroy_context(mm);
}
static const pgprot_t protection_map[16] = {
[VM_NONE] = PAGE_NONE,
[VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE),
[VM_WRITE] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_WRITABLE),
[VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_WRITABLE),
[VM_EXEC] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_EXEC),
[VM_EXEC | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_EXEC),
[VM_EXEC | VM_WRITE] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_WRITABLE |
CF_PAGE_EXEC),
[VM_EXEC | VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_WRITABLE |
CF_PAGE_EXEC),
[VM_SHARED] = PAGE_NONE,
[VM_SHARED | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE),
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
[VM_SHARED | VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_SHARED),
[VM_SHARED | VM_EXEC] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_EXEC),
[VM_SHARED | VM_EXEC | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_EXEC),
[VM_SHARED | VM_EXEC | VM_WRITE] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_SHARED |
CF_PAGE_EXEC),
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = __pgprot(CF_PAGE_VALID |
CF_PAGE_ACCESSED |
CF_PAGE_READABLE |
CF_PAGE_SHARED |
CF_PAGE_EXEC)
};
DECLARE_VM_GET_PAGE_PROT