mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 08:26:53 +07:00
d46869aaab
We should give some necessary check for initrd just like other architectures and it seems that setup_initrd() could be a common code for all architectures. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
196 lines
4.2 KiB
C
196 lines
4.2 KiB
C
// 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/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
|
|
pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
|
|
pte_t invalid_pte_table[PTRS_PER_PTE] __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);
|
|
}
|
|
|
|
void __init pre_mmu_init(void)
|
|
{
|
|
/*
|
|
* Setup page-table and enable TLB-hardrefill
|
|
*/
|
|
flush_tlb_all();
|
|
pgd_init((unsigned long *)swapper_pg_dir);
|
|
TLBMISS_HANDLER_SETUP_PGD(swapper_pg_dir);
|
|
TLBMISS_HANDLER_SETUP_PGD_KERNEL(swapper_pg_dir);
|
|
|
|
/* Setup page mask to 4k */
|
|
write_mmu_pagemask(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_offset(vaddr);
|
|
j = __pud_offset(vaddr);
|
|
k = __pmd_offset(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);
|
|
}
|