mirror of https://gitee.com/openkylin/linux.git
96 lines
2.5 KiB
C
96 lines
2.5 KiB
C
/*
|
|
* Copyright 2005, Paul Mackerras, IBM Corporation.
|
|
* Copyright 2009, Benjamin Herrenschmidt, IBM Corporation.
|
|
* Copyright 2015-2016, Aneesh Kumar K.V, IBM Corporation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/tlb.h>
|
|
|
|
#include "mmu_decl.h"
|
|
|
|
#ifdef CONFIG_SPARSEMEM_VMEMMAP
|
|
/*
|
|
* On hash-based CPUs, the vmemmap is bolted in the hash table.
|
|
*
|
|
*/
|
|
int __meminit hash__vmemmap_create_mapping(unsigned long start,
|
|
unsigned long page_size,
|
|
unsigned long phys)
|
|
{
|
|
int rc = htab_bolt_mapping(start, start + page_size, phys,
|
|
pgprot_val(PAGE_KERNEL),
|
|
mmu_vmemmap_psize, mmu_kernel_ssize);
|
|
if (rc < 0) {
|
|
int rc2 = htab_remove_mapping(start, start + page_size,
|
|
mmu_vmemmap_psize,
|
|
mmu_kernel_ssize);
|
|
BUG_ON(rc2 && (rc2 != -ENOENT));
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_MEMORY_HOTPLUG
|
|
void hash__vmemmap_remove_mapping(unsigned long start,
|
|
unsigned long page_size)
|
|
{
|
|
int rc = htab_remove_mapping(start, start + page_size,
|
|
mmu_vmemmap_psize,
|
|
mmu_kernel_ssize);
|
|
BUG_ON((rc < 0) && (rc != -ENOENT));
|
|
WARN_ON(rc == -ENOENT);
|
|
}
|
|
#endif
|
|
#endif /* CONFIG_SPARSEMEM_VMEMMAP */
|
|
|
|
/*
|
|
* map_kernel_page currently only called by __ioremap
|
|
* map_kernel_page adds an entry to the ioremap page table
|
|
* and adds an entry to the HPT, possibly bolting it
|
|
*/
|
|
int hash__map_kernel_page(unsigned long ea, unsigned long pa, unsigned long flags)
|
|
{
|
|
pgd_t *pgdp;
|
|
pud_t *pudp;
|
|
pmd_t *pmdp;
|
|
pte_t *ptep;
|
|
|
|
BUILD_BUG_ON(TASK_SIZE_USER64 > H_PGTABLE_RANGE);
|
|
if (slab_is_available()) {
|
|
pgdp = pgd_offset_k(ea);
|
|
pudp = pud_alloc(&init_mm, pgdp, ea);
|
|
if (!pudp)
|
|
return -ENOMEM;
|
|
pmdp = pmd_alloc(&init_mm, pudp, ea);
|
|
if (!pmdp)
|
|
return -ENOMEM;
|
|
ptep = pte_alloc_kernel(pmdp, ea);
|
|
if (!ptep)
|
|
return -ENOMEM;
|
|
set_pte_at(&init_mm, ea, ptep, pfn_pte(pa >> PAGE_SHIFT,
|
|
__pgprot(flags)));
|
|
} else {
|
|
/*
|
|
* If the mm subsystem is not fully up, we cannot create a
|
|
* linux page table entry for this mapping. Simply bolt an
|
|
* entry in the hardware page table.
|
|
*
|
|
*/
|
|
if (htab_bolt_mapping(ea, ea + PAGE_SIZE, pa, flags,
|
|
mmu_io_psize, mmu_kernel_ssize)) {
|
|
printk(KERN_ERR "Failed to do bolted mapping IO "
|
|
"memory at %016lx !\n", pa);
|
|
return -ENOMEM;
|
|
}
|
|
}
|
|
|
|
smp_wmb();
|
|
return 0;
|
|
}
|