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// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/bug.h>
#include <linux/module.h>
#include <linux/init.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/pagemap.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/memblock.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/pfn.h>
#include <linux/initrd.h>
#include <asm/setup.h>
#include <asm/cachectl.h>
#include <asm/dma.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/tlb.h>
#include <asm/cacheflush.h>
#define PTRS_KERN_TABLE \
((PTRS_PER_PGD - USER_PTRS_PER_PGD) * PTRS_PER_PTE)
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
pte_t kernel_pte_tables[PTRS_KERN_TABLE] __page_aligned_bss;
EXPORT_SYMBOL(invalid_pte_table);
unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
__page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);
#ifdef CONFIG_BLK_DEV_INITRD
static void __init setup_initrd(void)
{
unsigned long size;
if (initrd_start >= initrd_end) {
pr_err("initrd not found or empty");
goto disable;
}
if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
pr_err("initrd extends beyond end of memory");
goto disable;
}
size = initrd_end - initrd_start;
if (memblock_is_region_reserved(__pa(initrd_start), size)) {
pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
__pa(initrd_start), size);
goto disable;
}
memblock_reserve(__pa(initrd_start), size);
pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
(void *)(initrd_start), size);
initrd_below_start_ok = 1;
return;
disable:
initrd_start = initrd_end = 0;
pr_err(" - disabling initrd\n");
}
#endif
void __init mem_init(void)
{
#ifdef CONFIG_HIGHMEM
unsigned long tmp;
max_mapnr = highend_pfn;
#else
max_mapnr = max_low_pfn;
#endif
high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
#ifdef CONFIG_BLK_DEV_INITRD
setup_initrd();
#endif
memblock_free_all();
#ifdef CONFIG_HIGHMEM
for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
struct page *page = pfn_to_page(tmp);
/* FIXME not sure about */
if (!memblock_is_reserved(tmp << PAGE_SHIFT))
free_highmem_page(page);
}
#endif
mem_init_print_info(NULL);
}
extern char __init_begin[], __init_end[];
void free_initmem(void)
{
unsigned long addr;
addr = (unsigned long) &__init_begin;
while (addr < (unsigned long) &__init_end) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages_inc();
addr += PAGE_SIZE;
}
pr_info("Freeing unused kernel memory: %dk freed\n",
((unsigned int)&__init_end - (unsigned int)&__init_begin) >> 10);
}
void pgd_init(unsigned long *p)
{
int i;
for (i = 0; i < PTRS_PER_PGD; i++)
p[i] = __pa(invalid_pte_table);
flush_tlb_all();
local_icache_inv_all(NULL);
}
void __init mmu_init(unsigned long min_pfn, unsigned long max_pfn)
{
int i;
for (i = 0; i < USER_PTRS_PER_PGD; i++)
swapper_pg_dir[i].pgd = __pa(invalid_pte_table);
for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++)
swapper_pg_dir[i].pgd =
__pa(kernel_pte_tables + (PTRS_PER_PTE * (i - USER_PTRS_PER_PGD)));
for (i = 0; i < PTRS_KERN_TABLE; i++)
set_pte(&kernel_pte_tables[i], __pte(_PAGE_GLOBAL));
for (i = min_pfn; i < max_pfn; i++)
set_pte(&kernel_pte_tables[i - PFN_DOWN(va_pa_offset)], pfn_pte(i, PAGE_KERNEL));
flush_tlb_all();
local_icache_inv_all(NULL);
/* Setup page mask to 4k */
write_mmu_pagemask(0);
setup_pgd(swapper_pg_dir, 0);
}
void __init fixrange_init(unsigned long start, unsigned long end,
pgd_t *pgd_base)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
int i, j, k;
unsigned long vaddr;
vaddr = start;
i = pgd_index(vaddr);
j = pud_index(vaddr);
k = pmd_index(vaddr);
pgd = pgd_base + i;
for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
pud = (pud_t *)pgd;
for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
pmd = (pmd_t *)pud;
for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
if (pmd_none(*pmd)) {
pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
if (!pte)
panic("%s: Failed to allocate %lu bytes align=%lx\n",
__func__, PAGE_SIZE,
PAGE_SIZE);
set_pmd(pmd, __pmd(__pa(pte)));
BUG_ON(pte != pte_offset_kernel(pmd, 0));
}
vaddr += PMD_SIZE;
}
k = 0;
}
j = 0;
}
}
void __init fixaddr_init(void)
{
unsigned long vaddr;
vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
}
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