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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2005,2006,2007,2008,2009,2010 Imagination Technologies
*
*/
#include <linux/export.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/pagemap.h>
#include <linux/percpu.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <linux/sched/task.h>
#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgalloc.h>
#include <asm/mmu.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/tlb.h>
#include <asm/user_gateway.h>
#include <asm/mmzone.h>
#include <asm/fixmap.h>
unsigned long pfn_base;
EXPORT_SYMBOL(pfn_base);
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_data;
unsigned long empty_zero_page;
EXPORT_SYMBOL(empty_zero_page);
extern char __user_gateway_start;
extern char __user_gateway_end;
void *gateway_page;
/*
* Insert the gateway page into a set of page tables, creating the
* page tables if necessary.
*/
static void insert_gateway_page(pgd_t *pgd, unsigned long address)
{
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
BUG_ON(!pgd_present(*pgd));
pud = pud_offset(pgd, address);
BUG_ON(!pud_present(*pud));
pmd = pmd_offset(pud, address);
if (!pmd_present(*pmd)) {
pte = alloc_bootmem_pages(PAGE_SIZE);
set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)));
}
pte = pte_offset_kernel(pmd, address);
set_pte(pte, pfn_pte(__pa(gateway_page) >> PAGE_SHIFT, PAGE_READONLY));
}
/* Alloc and map a page in a known location accessible to userspace. */
static void __init user_gateway_init(void)
{
unsigned long address = USER_GATEWAY_PAGE;
int offset = pgd_index(address);
pgd_t *pgd;
gateway_page = alloc_bootmem_pages(PAGE_SIZE);
pgd = swapper_pg_dir + offset;
insert_gateway_page(pgd, address);
#ifdef CONFIG_METAG_META12
/*
* Insert the gateway page into our current page tables even
* though we've already inserted it into our reference page
* table (swapper_pg_dir). This is because with a META1 mmu we
* copy just the user address range and not the gateway page
* entry on context switch, see switch_mmu().
*/
pgd = (pgd_t *)mmu_get_base() + offset;
insert_gateway_page(pgd, address);
#endif /* CONFIG_METAG_META12 */
BUG_ON((&__user_gateway_end - &__user_gateway_start) > PAGE_SIZE);
gateway_page += (address & ~PAGE_MASK);
memcpy(gateway_page, &__user_gateway_start,
&__user_gateway_end - &__user_gateway_start);
/*
* We don't need to flush the TLB here, there should be no mapping
* present at boot for this address and only valid mappings are in
* the TLB (apart from on Meta 1.x, but those cached invalid
* mappings should be impossible to hit here).
*
* We don't flush the code cache here even though we have written
* code through the data cache and they may not be coherent. At
* this point we assume there is no stale data in the code cache
* for this address so there is no need to flush.
*/
}
static void __init allocate_pgdat(unsigned int nid)
{
unsigned long start_pfn, end_pfn;
#ifdef CONFIG_NEED_MULTIPLE_NODES
unsigned long phys;
#endif
get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
#ifdef CONFIG_NEED_MULTIPLE_NODES
phys = __memblock_alloc_base(sizeof(struct pglist_data),
SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT);
/* Retry with all of system memory */
if (!phys)
phys = __memblock_alloc_base(sizeof(struct pglist_data),
SMP_CACHE_BYTES,
memblock_end_of_DRAM());
if (!phys)
panic("Can't allocate pgdat for node %d\n", nid);
NODE_DATA(nid) = __va(phys);
memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
#endif
NODE_DATA(nid)->node_start_pfn = start_pfn;
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
}
static void __init bootmem_init_one_node(unsigned int nid)
{
unsigned long total_pages, paddr;
unsigned long end_pfn;
struct pglist_data *p;
p = NODE_DATA(nid);
/* Nothing to do.. */
if (!p->node_spanned_pages)
return;
end_pfn = pgdat_end_pfn(p);
#ifdef CONFIG_HIGHMEM
if (end_pfn > max_low_pfn)
end_pfn = max_low_pfn;
#endif
total_pages = bootmem_bootmap_pages(end_pfn - p->node_start_pfn);
paddr = memblock_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE);
if (!paddr)
panic("Can't allocate bootmap for nid[%d]\n", nid);
init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn);
free_bootmem_with_active_regions(nid, end_pfn);
/*
* XXX Handle initial reservations for the system memory node
* only for the moment, we'll refactor this later for handling
* reservations in other nodes.
*/
if (nid == 0) {
struct memblock_region *reg;
/* Reserve the sections we're already using. */
for_each_memblock(reserved, reg) {
unsigned long size = reg->size;
#ifdef CONFIG_HIGHMEM
/* ...but not highmem */
if (PFN_DOWN(reg->base) >= highstart_pfn)
continue;
if (PFN_UP(reg->base + size) > highstart_pfn)
size = (highstart_pfn - PFN_DOWN(reg->base))
<< PAGE_SHIFT;
#endif
reserve_bootmem(reg->base, size, BOOTMEM_DEFAULT);
}
}
sparse_memory_present_with_active_regions(nid);
}
static void __init do_init_bootmem(void)
{
struct memblock_region *reg;
int i;
/* Add active regions with valid PFNs. */
for_each_memblock(memory, reg) {
unsigned long start_pfn, end_pfn;
start_pfn = memblock_region_memory_base_pfn(reg);
end_pfn = memblock_region_memory_end_pfn(reg);
memblock_set_node(PFN_PHYS(start_pfn),
PFN_PHYS(end_pfn - start_pfn),
&memblock.memory, 0);
}
/* All of system RAM sits in node 0 for the non-NUMA case */
allocate_pgdat(0);
node_set_online(0);
soc_mem_setup();
for_each_online_node(i)
bootmem_init_one_node(i);
sparse_init();
}
extern char _heap_start[];
static void __init init_and_reserve_mem(void)
{
unsigned long start_pfn, heap_start;
u64 base = min_low_pfn << PAGE_SHIFT;
u64 size = (max_low_pfn << PAGE_SHIFT) - base;
heap_start = (unsigned long) &_heap_start;
memblock_add(base, size);
/*
* Partially used pages are not usable - thus
* we are rounding upwards:
*/
start_pfn = PFN_UP(__pa(heap_start));
/*
* Reserve the kernel text.
*/
memblock_reserve(base, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - base);
#ifdef CONFIG_HIGHMEM
/*
* Add & reserve highmem, so page structures are initialised.
*/
base = highstart_pfn << PAGE_SHIFT;
size = (highend_pfn << PAGE_SHIFT) - base;
if (size) {
memblock_add(base, size);
memblock_reserve(base, size);
}
#endif
}
#ifdef CONFIG_HIGHMEM
/*
* Ensure we have allocated page tables in swapper_pg_dir for the
* fixed mappings range from 'start' to 'end'.
*/
static void __init allocate_pgtables(unsigned long start, unsigned long end)
{
pgd_t *pgd;
pmd_t *pmd;
pte_t *pte;
int i, j;
unsigned long vaddr;
vaddr = start;
i = pgd_index(vaddr);
j = pmd_index(vaddr);
pgd = swapper_pg_dir + i;
for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
pmd = (pmd_t *)pgd;
for (; (j < PTRS_PER_PMD) && (vaddr != end); pmd++, j++) {
vaddr += PMD_SIZE;
if (!pmd_none(*pmd))
continue;
pte = (pte_t *)alloc_bootmem_low_pages(PAGE_SIZE);
pmd_populate_kernel(&init_mm, pmd, pte);
}
j = 0;
}
}
static void __init fixedrange_init(void)
{
unsigned long vaddr, end;
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
/*
* Fixed mappings:
*/
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
allocate_pgtables(vaddr, end);
/*
* Permanent kmaps:
*/
vaddr = PKMAP_BASE;
allocate_pgtables(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP);
pgd = swapper_pg_dir + pgd_index(vaddr);
pud = pud_offset(pgd, vaddr);
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
pkmap_page_table = pte;
}
#endif /* CONFIG_HIGHMEM */
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/metag/kernel/setup.c.
*/
void __init paging_init(unsigned long mem_end)
{
unsigned long max_zone_pfns[MAX_NR_ZONES];
int nid;
init_and_reserve_mem();
memblock_allow_resize();
memblock_dump_all();
nodes_clear(node_online_map);
init_new_context(&init_task, &init_mm);
memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
do_init_bootmem();
mmu_init(mem_end);
#ifdef CONFIG_HIGHMEM
fixedrange_init();
kmap_init();
#endif
/* Initialize the zero page to a bootmem page, already zeroed. */
empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
user_gateway_init();
memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
for_each_online_node(nid) {
pg_data_t *pgdat = NODE_DATA(nid);
unsigned long low, start_pfn;
start_pfn = pgdat->bdata->node_min_pfn;
low = pgdat->bdata->node_low_pfn;
if (max_zone_pfns[ZONE_NORMAL] < low)
max_zone_pfns[ZONE_NORMAL] = low;
#ifdef CONFIG_HIGHMEM
max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
#endif
pr_info("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
nid, start_pfn, low);
}
free_area_init_nodes(max_zone_pfns);
}
void __init mem_init(void)
{
#ifdef CONFIG_HIGHMEM
unsigned long tmp;
/*
* Explicitly reset zone->managed_pages because highmem pages are
* freed before calling free_all_bootmem();
*/
reset_all_zones_managed_pages();
for (tmp = highstart_pfn; tmp < highend_pfn; tmp++)
free_highmem_page(pfn_to_page(tmp));
#endif /* CONFIG_HIGHMEM */
free_all_bootmem();
mem_init_print_info(NULL);
}
void free_initmem(void)
{
free_initmem_default(POISON_FREE_INITMEM);
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
"initrd");
}
#endif