nds32: MMU initialization
This patch includes memory initializations and highmem supporting. Signed-off-by: Vincent Chen <vincentc@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com> Acked-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Greentime Hu
Родитель
2e1aecb970
Коммит
59fd53cd5c
|
|
@ -0,0 +1,79 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (C) 2005-2017 Andes Technology Corporation
|
||||
|
||||
#include <linux/export.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/smp.h>
|
||||
#include <linux/interrupt.h>
|
||||
#include <linux/bootmem.h>
|
||||
#include <asm/fixmap.h>
|
||||
#include <asm/tlbflush.h>
|
||||
|
||||
void *kmap(struct page *page)
|
||||
{
|
||||
unsigned long vaddr;
|
||||
might_sleep();
|
||||
if (!PageHighMem(page))
|
||||
return page_address(page);
|
||||
vaddr = (unsigned long)kmap_high(page);
|
||||
return (void *)vaddr;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(kmap);
|
||||
|
||||
void kunmap(struct page *page)
|
||||
{
|
||||
BUG_ON(in_interrupt());
|
||||
if (!PageHighMem(page))
|
||||
return;
|
||||
kunmap_high(page);
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(kunmap);
|
||||
|
||||
void *kmap_atomic(struct page *page)
|
||||
{
|
||||
unsigned int idx;
|
||||
unsigned long vaddr, pte;
|
||||
int type;
|
||||
pte_t *ptep;
|
||||
|
||||
preempt_disable();
|
||||
pagefault_disable();
|
||||
if (!PageHighMem(page))
|
||||
return page_address(page);
|
||||
|
||||
type = kmap_atomic_idx_push();
|
||||
|
||||
idx = type + KM_TYPE_NR * smp_processor_id();
|
||||
vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
|
||||
pte = (page_to_pfn(page) << PAGE_SHIFT) | (PAGE_KERNEL);
|
||||
ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
|
||||
set_pte(ptep, pte);
|
||||
|
||||
__nds32__tlbop_inv(vaddr);
|
||||
__nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN);
|
||||
__nds32__tlbop_rwr(pte);
|
||||
__nds32__isb();
|
||||
return (void *)vaddr;
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(kmap_atomic);
|
||||
|
||||
void __kunmap_atomic(void *kvaddr)
|
||||
{
|
||||
if (kvaddr >= (void *)FIXADDR_START) {
|
||||
unsigned long vaddr = (unsigned long)kvaddr;
|
||||
pte_t *ptep;
|
||||
kmap_atomic_idx_pop();
|
||||
__nds32__tlbop_inv(vaddr);
|
||||
__nds32__isb();
|
||||
ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr);
|
||||
set_pte(ptep, 0);
|
||||
}
|
||||
pagefault_enable();
|
||||
preempt_enable();
|
||||
}
|
||||
|
||||
EXPORT_SYMBOL(__kunmap_atomic);
|
||||
|
|
@ -0,0 +1,277 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (C) 1995-2005 Russell King
|
||||
// Copyright (C) 2012 ARM Ltd.
|
||||
// Copyright (C) 2013-2017 Andes Technology Corporation
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/swap.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/bootmem.h>
|
||||
#include <linux/mman.h>
|
||||
#include <linux/nodemask.h>
|
||||
#include <linux/initrd.h>
|
||||
#include <linux/highmem.h>
|
||||
#include <linux/memblock.h>
|
||||
|
||||
#include <asm/sections.h>
|
||||
#include <asm/setup.h>
|
||||
#include <asm/tlb.h>
|
||||
#include <asm/page.h>
|
||||
|
||||
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
|
||||
DEFINE_SPINLOCK(anon_alias_lock);
|
||||
extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
|
||||
extern unsigned long phys_initrd_start;
|
||||
extern unsigned long phys_initrd_size;
|
||||
|
||||
/*
|
||||
* empty_zero_page is a special page that is used for
|
||||
* zero-initialized data and COW.
|
||||
*/
|
||||
struct page *empty_zero_page;
|
||||
|
||||
static void __init zone_sizes_init(void)
|
||||
{
|
||||
unsigned long zones_size[MAX_NR_ZONES];
|
||||
|
||||
/* Clear the zone sizes */
|
||||
memset(zones_size, 0, sizeof(zones_size));
|
||||
|
||||
zones_size[ZONE_NORMAL] = max_low_pfn;
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
zones_size[ZONE_HIGHMEM] = max_pfn;
|
||||
#endif
|
||||
free_area_init(zones_size);
|
||||
|
||||
}
|
||||
|
||||
/*
|
||||
* Map all physical memory under high_memory into kernel's address space.
|
||||
*
|
||||
* This is explicitly coded for two-level page tables, so if you need
|
||||
* something else then this needs to change.
|
||||
*/
|
||||
static void __init map_ram(void)
|
||||
{
|
||||
unsigned long v, p, e;
|
||||
pgd_t *pge;
|
||||
pud_t *pue;
|
||||
pmd_t *pme;
|
||||
pte_t *pte;
|
||||
/* These mark extents of read-only kernel pages...
|
||||
* ...from vmlinux.lds.S
|
||||
*/
|
||||
|
||||
p = (u32) memblock_start_of_DRAM() & PAGE_MASK;
|
||||
e = min((u32) memblock_end_of_DRAM(), (u32) __pa(high_memory));
|
||||
|
||||
v = (u32) __va(p);
|
||||
pge = pgd_offset_k(v);
|
||||
|
||||
while (p < e) {
|
||||
int j;
|
||||
pue = pud_offset(pge, v);
|
||||
pme = pmd_offset(pue, v);
|
||||
|
||||
if ((u32) pue != (u32) pge || (u32) pme != (u32) pge) {
|
||||
panic("%s: Kernel hardcoded for "
|
||||
"two-level page tables", __func__);
|
||||
}
|
||||
|
||||
/* Alloc one page for holding PTE's... */
|
||||
pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
|
||||
memset(pte, 0, PAGE_SIZE);
|
||||
set_pmd(pme, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE));
|
||||
|
||||
/* Fill the newly allocated page with PTE'S */
|
||||
for (j = 0; p < e && j < PTRS_PER_PTE;
|
||||
v += PAGE_SIZE, p += PAGE_SIZE, j++, pte++) {
|
||||
/* Create mapping between p and v. */
|
||||
/* TODO: more fine grant for page access permission */
|
||||
set_pte(pte, __pte(p + pgprot_val(PAGE_KERNEL)));
|
||||
}
|
||||
|
||||
pge++;
|
||||
}
|
||||
}
|
||||
static pmd_t *fixmap_pmd_p;
|
||||
static void __init fixedrange_init(void)
|
||||
{
|
||||
unsigned long vaddr;
|
||||
pgd_t *pgd;
|
||||
pud_t *pud;
|
||||
pmd_t *pmd;
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
pte_t *pte;
|
||||
#endif /* CONFIG_HIGHMEM */
|
||||
|
||||
/*
|
||||
* Fixed mappings:
|
||||
*/
|
||||
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1);
|
||||
pgd = swapper_pg_dir + pgd_index(vaddr);
|
||||
pud = pud_offset(pgd, vaddr);
|
||||
pmd = pmd_offset(pud, vaddr);
|
||||
fixmap_pmd_p = (pmd_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
|
||||
memset(fixmap_pmd_p, 0, PAGE_SIZE);
|
||||
set_pmd(pmd, __pmd(__pa(fixmap_pmd_p) + _PAGE_KERNEL_TABLE));
|
||||
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
/*
|
||||
* Permanent kmaps:
|
||||
*/
|
||||
vaddr = PKMAP_BASE;
|
||||
|
||||
pgd = swapper_pg_dir + pgd_index(vaddr);
|
||||
pud = pud_offset(pgd, vaddr);
|
||||
pmd = pmd_offset(pud, vaddr);
|
||||
pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
|
||||
memset(pte, 0, PAGE_SIZE);
|
||||
set_pmd(pmd, __pmd(__pa(pte) + _PAGE_KERNEL_TABLE));
|
||||
pkmap_page_table = pte;
|
||||
#endif /* CONFIG_HIGHMEM */
|
||||
}
|
||||
|
||||
/*
|
||||
* paging_init() sets up the page tables, initialises the zone memory
|
||||
* maps, and sets up the zero page, bad page and bad page tables.
|
||||
*/
|
||||
void __init paging_init(void)
|
||||
{
|
||||
int i;
|
||||
void *zero_page;
|
||||
|
||||
pr_info("Setting up paging and PTEs.\n");
|
||||
/* clear out the init_mm.pgd that will contain the kernel's mappings */
|
||||
for (i = 0; i < PTRS_PER_PGD; i++)
|
||||
swapper_pg_dir[i] = __pgd(1);
|
||||
|
||||
map_ram();
|
||||
|
||||
fixedrange_init();
|
||||
|
||||
/* allocate space for empty_zero_page */
|
||||
zero_page = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
|
||||
memset(zero_page, 0, PAGE_SIZE);
|
||||
zone_sizes_init();
|
||||
|
||||
empty_zero_page = virt_to_page(zero_page);
|
||||
flush_dcache_page(empty_zero_page);
|
||||
}
|
||||
|
||||
static inline void __init free_highmem(void)
|
||||
{
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
unsigned long pfn;
|
||||
for (pfn = PFN_UP(__pa(high_memory)); pfn < max_pfn; pfn++) {
|
||||
phys_addr_t paddr = (phys_addr_t) pfn << PAGE_SHIFT;
|
||||
if (!memblock_is_reserved(paddr))
|
||||
free_highmem_page(pfn_to_page(pfn));
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
static void __init set_max_mapnr_init(void)
|
||||
{
|
||||
max_mapnr = max_pfn;
|
||||
}
|
||||
|
||||
/*
|
||||
* mem_init() marks the free areas in the mem_map and tells us how much
|
||||
* memory is free. This is done after various parts of the system have
|
||||
* claimed their memory after the kernel image.
|
||||
*/
|
||||
void __init mem_init(void)
|
||||
{
|
||||
phys_addr_t memory_start = memblock_start_of_DRAM();
|
||||
BUG_ON(!mem_map);
|
||||
set_max_mapnr_init();
|
||||
|
||||
free_highmem();
|
||||
|
||||
/* this will put all low memory onto the freelists */
|
||||
free_all_bootmem();
|
||||
mem_init_print_info(NULL);
|
||||
|
||||
pr_info("virtual kernel memory layout:\n"
|
||||
" fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
" pkmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
||||
#endif
|
||||
" consist : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
||||
" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
||||
" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
|
||||
" .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
||||
" .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
|
||||
" .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
|
||||
FIXADDR_START, FIXADDR_TOP, (FIXADDR_TOP - FIXADDR_START) >> 10,
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
|
||||
(LAST_PKMAP * PAGE_SIZE) >> 10,
|
||||
#endif
|
||||
CONSISTENT_BASE, CONSISTENT_END,
|
||||
((CONSISTENT_END) - (CONSISTENT_BASE)) >> 20, VMALLOC_START,
|
||||
(unsigned long)VMALLOC_END, (VMALLOC_END - VMALLOC_START) >> 20,
|
||||
(unsigned long)__va(memory_start), (unsigned long)high_memory,
|
||||
((unsigned long)high_memory -
|
||||
(unsigned long)__va(memory_start)) >> 20,
|
||||
(unsigned long)&__init_begin, (unsigned long)&__init_end,
|
||||
((unsigned long)&__init_end -
|
||||
(unsigned long)&__init_begin) >> 10, (unsigned long)&_etext,
|
||||
(unsigned long)&_edata,
|
||||
((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
|
||||
(unsigned long)&_text, (unsigned long)&_etext,
|
||||
((unsigned long)&_etext - (unsigned long)&_text) >> 10);
|
||||
|
||||
/*
|
||||
* Check boundaries twice: Some fundamental inconsistencies can
|
||||
* be detected at build time already.
|
||||
*/
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
|
||||
BUILD_BUG_ON((CONSISTENT_END) > PKMAP_BASE);
|
||||
#endif
|
||||
BUILD_BUG_ON(VMALLOC_END > CONSISTENT_BASE);
|
||||
BUILD_BUG_ON(VMALLOC_START >= VMALLOC_END);
|
||||
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > FIXADDR_START);
|
||||
BUG_ON(CONSISTENT_END > PKMAP_BASE);
|
||||
#endif
|
||||
BUG_ON(VMALLOC_END > CONSISTENT_BASE);
|
||||
BUG_ON(VMALLOC_START >= VMALLOC_END);
|
||||
BUG_ON((unsigned long)high_memory > VMALLOC_START);
|
||||
|
||||
return;
|
||||
}
|
||||
|
||||
void free_initmem(void)
|
||||
{
|
||||
free_initmem_default(-1);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_BLK_DEV_INITRD
|
||||
void free_initrd_mem(unsigned long start, unsigned long end)
|
||||
{
|
||||
free_reserved_area((void *)start, (void *)end, -1, "initrd");
|
||||
}
|
||||
#endif
|
||||
|
||||
void __set_fixmap(enum fixed_addresses idx,
|
||||
phys_addr_t phys, pgprot_t flags)
|
||||
{
|
||||
unsigned long addr = __fix_to_virt(idx);
|
||||
pte_t *pte;
|
||||
|
||||
BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
|
||||
|
||||
pte = (pte_t *)&fixmap_pmd_p[pte_index(addr)];;
|
||||
|
||||
if (pgprot_val(flags)) {
|
||||
set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags));
|
||||
} else {
|
||||
pte_clear(&init_mm, addr, pte);
|
||||
flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,90 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
// Copyright (C) 2005-2017 Andes Technology Corporation
|
||||
|
||||
#include <linux/init_task.h>
|
||||
#include <asm/pgalloc.h>
|
||||
|
||||
#define FIRST_KERNEL_PGD_NR (USER_PTRS_PER_PGD)
|
||||
|
||||
/*
|
||||
* need to get a page for level 1
|
||||
*/
|
||||
|
||||
pgd_t *pgd_alloc(struct mm_struct *mm)
|
||||
{
|
||||
pgd_t *new_pgd, *init_pgd;
|
||||
int i;
|
||||
|
||||
new_pgd = (pgd_t *) __get_free_pages(GFP_KERNEL, 0);
|
||||
if (!new_pgd)
|
||||
return NULL;
|
||||
for (i = 0; i < PTRS_PER_PGD; i++) {
|
||||
(*new_pgd) = 1;
|
||||
new_pgd++;
|
||||
}
|
||||
new_pgd -= PTRS_PER_PGD;
|
||||
|
||||
init_pgd = pgd_offset_k(0);
|
||||
|
||||
memcpy(new_pgd + FIRST_KERNEL_PGD_NR, init_pgd + FIRST_KERNEL_PGD_NR,
|
||||
(PTRS_PER_PGD - FIRST_KERNEL_PGD_NR) * sizeof(pgd_t));
|
||||
|
||||
cpu_dcache_wb_range((unsigned long)new_pgd,
|
||||
(unsigned long)new_pgd +
|
||||
PTRS_PER_PGD * sizeof(pgd_t));
|
||||
inc_zone_page_state(virt_to_page((unsigned long *)new_pgd),
|
||||
NR_PAGETABLE);
|
||||
|
||||
return new_pgd;
|
||||
}
|
||||
|
||||
void pgd_free(struct mm_struct *mm, pgd_t * pgd)
|
||||
{
|
||||
pmd_t *pmd;
|
||||
struct page *pte;
|
||||
|
||||
if (!pgd)
|
||||
return;
|
||||
|
||||
pmd = (pmd_t *) pgd;
|
||||
if (pmd_none(*pmd))
|
||||
goto free;
|
||||
if (pmd_bad(*pmd)) {
|
||||
pmd_ERROR(*pmd);
|
||||
pmd_clear(pmd);
|
||||
goto free;
|
||||
}
|
||||
|
||||
pte = pmd_page(*pmd);
|
||||
pmd_clear(pmd);
|
||||
dec_zone_page_state(virt_to_page((unsigned long *)pgd), NR_PAGETABLE);
|
||||
pte_free(mm, pte);
|
||||
mm_dec_nr_ptes(mm);
|
||||
pmd_free(mm, pmd);
|
||||
free:
|
||||
free_pages((unsigned long)pgd, 0);
|
||||
}
|
||||
|
||||
/*
|
||||
* In order to soft-boot, we need to insert a 1:1 mapping in place of
|
||||
* the user-mode pages. This will then ensure that we have predictable
|
||||
* results when turning the mmu off
|
||||
*/
|
||||
void setup_mm_for_reboot(char mode)
|
||||
{
|
||||
unsigned long pmdval;
|
||||
pgd_t *pgd;
|
||||
pmd_t *pmd;
|
||||
int i;
|
||||
|
||||
if (current->mm && current->mm->pgd)
|
||||
pgd = current->mm->pgd;
|
||||
else
|
||||
pgd = init_mm.pgd;
|
||||
|
||||
for (i = 0; i < USER_PTRS_PER_PGD; i++) {
|
||||
pmdval = (i << PGDIR_SHIFT);
|
||||
pmd = pmd_offset(pgd + i, i << PGDIR_SHIFT);
|
||||
set_pmd(pmd, __pmd(pmdval));
|
||||
}
|
||||
}
|
||||
Загрузка…
Ссылка в новой задаче