// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/sparc/mm/init.c
*
* Copyright (C) 1995 David S. Miller ([email protected])
* Copyright (C) 1995 Eddie C. Dost ([email protected])
* Copyright (C) 1998 Jakub Jelinek ([email protected])
* Copyright (C) 2000 Anton Blanchard ([email protected])
*/
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/initrd.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/memblock.h>
#include <linux/pagemap.h>
#include <linux/poison.h>
#include <linux/gfp.h>
#include <asm/sections.h>
#include <asm/page.h>
#include <asm/vaddrs.h>
#include <asm/setup.h>
#include <asm/tlb.h>
#include <asm/prom.h>
#include <asm/leon.h>
#include "mm_32.h"
static unsigned long *sparc_valid_addr_bitmap;
unsigned long phys_base;
EXPORT_SYMBOL(phys_base);
unsigned long pfn_base;
EXPORT_SYMBOL(pfn_base);
struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS+1];
/* Initial ramdisk setup */
extern unsigned int sparc_ramdisk_image;
extern unsigned int sparc_ramdisk_size;
unsigned long highstart_pfn, highend_pfn;
unsigned long last_valid_pfn;
unsigned long calc_highpages(void)
{
int i;
int nr = 0;
for (i = 0; sp_banks[i].num_bytes != 0; i++) {
unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
if (end_pfn <= max_low_pfn)
continue;
if (start_pfn < max_low_pfn)
start_pfn = max_low_pfn;
nr += end_pfn - start_pfn;
}
return nr;
}
static unsigned long calc_max_low_pfn(void)
{
int i;
unsigned long tmp = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
unsigned long curr_pfn, last_pfn;
last_pfn = (sp_banks[0].base_addr + sp_banks[0].num_bytes) >> PAGE_SHIFT;
for (i = 1; sp_banks[i].num_bytes != 0; i++) {
curr_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
if (curr_pfn >= tmp) {
if (last_pfn < tmp)
tmp = last_pfn;
break;
}
last_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
}
return tmp;
}
static void __init find_ramdisk(unsigned long end_of_phys_memory)
{
#ifdef CONFIG_BLK_DEV_INITRD
unsigned long size;
/* Now have to check initial ramdisk, so that it won't pass
* the end of memory
*/
if (sparc_ramdisk_image) {
if (sparc_ramdisk_image >= (unsigned long)&_end - 2 * PAGE_SIZE)
sparc_ramdisk_image -= KERNBASE;
initrd_start = sparc_ramdisk_image + phys_base;
initrd_end = initrd_start + sparc_ramdisk_size;
if (initrd_end > end_of_phys_memory) {
printk(KERN_CRIT "initrd extends beyond end of memory "
"(0x%016lx > 0x%016lx)\ndisabling initrd\n",
initrd_end, end_of_phys_memory);
initrd_start = 0;
} else {
/* Reserve the initrd image area. */
size = initrd_end - initrd_start;
memblock_reserve(initrd_start, size);
initrd_start = (initrd_start - phys_base) + PAGE_OFFSET;
initrd_end = (initrd_end - phys_base) + PAGE_OFFSET;
}
}
#endif
}
unsigned long __init bootmem_init(unsigned long *pages_avail)
{
unsigned long start_pfn, bytes_avail, size;
unsigned long end_of_phys_memory = 0;
unsigned long high_pages = 0;
int i;
memblock_set_bottom_up(true);
memblock_allow_resize();
bytes_avail = 0UL;
for (i = 0; sp_banks[i].num_bytes != 0; i++) {
end_of_phys_memory = sp_banks[i].base_addr +
sp_banks[i].num_bytes;
bytes_avail += sp_banks[i].num_bytes;
if (cmdline_memory_size) {
if (bytes_avail > cmdline_memory_size) {
unsigned long slack = bytes_avail - cmdline_memory_size;
bytes_avail -= slack;
end_of_phys_memory -= slack;
sp_banks[i].num_bytes -= slack;
if (sp_banks[i].num_bytes == 0) {
sp_banks[i].base_addr = 0xdeadbeef;
} else {
memblock_add(sp_banks[i].base_addr,
sp_banks[i].num_bytes);
sp_banks[i+1].num_bytes = 0;
sp_banks[i+1].base_addr = 0xdeadbeef;
}
break;
}
}
memblock_add(sp_banks[i].base_addr, sp_banks[i].num_bytes);
}
/* Start with page aligned address of last symbol in kernel
* image.
*/
start_pfn = (unsigned long)__pa(PAGE_ALIGN((unsigned long) &_end));
/* Now shift down to get the real physical page frame number. */
start_pfn >>= PAGE_SHIFT;
max_pfn = end_of_phys_memory >> PAGE_SHIFT;
max_low_pfn = max_pfn;
highstart_pfn = highend_pfn = max_pfn;
if (max_low_pfn > pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT)) {
highstart_pfn = pfn_base + (SRMMU_MAXMEM >> PAGE_SHIFT);
max_low_pfn = calc_max_low_pfn();
high_pages = calc_highpages();
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
high_pages >> (20 - PAGE_SHIFT));
}
find_ramdisk(end_of_phys_memory);
/* Reserve the kernel text/data/bss. */
size = (start_pfn << PAGE_SHIFT) - phys_base;
memblock_reserve(phys_base, size);
memblock_add(phys_base, size);
size = memblock_phys_mem_size() - memblock_reserved_size();
*pages_avail = (size >> PAGE_SHIFT) - high_pages;
/* Only allow low memory to be allocated via memblock allocation */
memblock_set_current_limit(max_low_pfn << PAGE_SHIFT);
return max_pfn;
}
/*
* paging_init() sets up the page tables: We call the MMU specific
* init routine based upon the Sun model type on the Sparc.
*
*/
void __init paging_init(void)
{
srmmu_paging_init();
prom_build_devicetree();
of_fill_in_cpu_data();
device_scan();
}
static void __init taint_real_pages(void)
{
int i;
for (i = 0; sp_banks[i].num_bytes; i++) {
unsigned long start, end;
start = sp_banks[i].base_addr;
end = start + sp_banks[i].num_bytes;
while (start < end) {
set_bit(start >> 20, sparc_valid_addr_bitmap);
start += PAGE_SIZE;
}
}
}
static void map_high_region(unsigned long start_pfn, unsigned long end_pfn)
{
unsigned long tmp;
#ifdef CONFIG_DEBUG_HIGHMEM
printk("mapping high region %08lx - %08lx\n", start_pfn, end_pfn);
#endif
for (tmp = start_pfn; tmp < end_pfn; tmp++)
free_highmem_page(pfn_to_page(tmp));
}
void __init mem_init(void)
{
int i;
if (PKMAP_BASE+LAST_PKMAP*PAGE_SIZE >= FIXADDR_START) {
prom_printf("BUG: fixmap and pkmap areas overlap\n");
prom_printf("pkbase: 0x%lx pkend: 0x%lx fixstart 0x%lx\n",
PKMAP_BASE,
(unsigned long)PKMAP_BASE+LAST_PKMAP*PAGE_SIZE,
FIXADDR_START);
prom_printf("Please mail [email protected].\n");
prom_halt();
}
/* Saves us work later. */
memset((void *)empty_zero_page, 0, PAGE_SIZE);
i = last_valid_pfn >> ((20 - PAGE_SHIFT) + 5);
i += 1;
sparc_valid_addr_bitmap = (unsigned long *)
memblock_alloc(i << 2, SMP_CACHE_BYTES);
if (sparc_valid_addr_bitmap == NULL) {
prom_printf("mem_init: Cannot alloc valid_addr_bitmap.\n");
prom_halt();
}
memset(sparc_valid_addr_bitmap, 0, i << 2);
taint_real_pages();
max_mapnr = last_valid_pfn - pfn_base;
high_memory = __va(max_low_pfn << PAGE_SHIFT);
memblock_free_all();
for (i = 0; sp_banks[i].num_bytes != 0; i++) {
unsigned long start_pfn = sp_banks[i].base_addr >> PAGE_SHIFT;
unsigned long end_pfn = (sp_banks[i].base_addr + sp_banks[i].num_bytes) >> PAGE_SHIFT;
if (end_pfn <= highstart_pfn)
continue;
if (start_pfn < highstart_pfn)
start_pfn = highstart_pfn;
map_high_region(start_pfn, end_pfn);
}
}
void sparc_flush_page_to_ram(struct page *page)
{
unsigned long vaddr = (unsigned long)page_address(page);
__flush_page_to_ram(vaddr);
}
EXPORT_SYMBOL(sparc_flush_page_to_ram);
void sparc_flush_folio_to_ram(struct folio *folio)
{
unsigned long vaddr = (unsigned long)folio_address(folio);
unsigned int i, nr = folio_nr_pages(folio);
for (i = 0; i < nr; i++)
__flush_page_to_ram(vaddr + i * PAGE_SIZE);
}
EXPORT_SYMBOL(sparc_flush_folio_to_ram);
static const pgprot_t protection_map[16] = {
[VM_NONE] = PAGE_NONE,
[VM_READ] = PAGE_READONLY,
[VM_WRITE] = PAGE_COPY,
[VM_WRITE | VM_READ] = PAGE_COPY,
[VM_EXEC] = PAGE_READONLY,
[VM_EXEC | VM_READ] = PAGE_READONLY,
[VM_EXEC | VM_WRITE] = PAGE_COPY,
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY,
[VM_SHARED] = PAGE_NONE,
[VM_SHARED | VM_READ] = PAGE_READONLY,
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
[VM_SHARED | VM_EXEC] = PAGE_READONLY,
[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY,
[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED,
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED
};
DECLARE_VM_GET_PAGE_PROT
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