mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-28 22:54:05 +08:00
518a6b5824
Also iterate the PMD tables to populate the PTE table allocator. This also fully replaces the previous zero_pgtable hack. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will@kernel.org> Acked-by: Greg Ungerer <gerg@linux-m68k.org> Tested-by: Michael Schmitz <schmitzmic@gmail.com> Tested-by: Greg Ungerer <gerg@linux-m68k.org> Link: https://lore.kernel.org/r/20200131125403.938797587@infradead.org Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
158 lines
3.6 KiB
C
158 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/m68k/mm/init.c
|
|
*
|
|
* Copyright (C) 1995 Hamish Macdonald
|
|
*
|
|
* Contains common initialization routines, specific init code moved
|
|
* to motorola.c and sun3mmu.c
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/signal.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/gfp.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/io.h>
|
|
#ifdef CONFIG_ATARI
|
|
#include <asm/atari_stram.h>
|
|
#endif
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
|
|
/*
|
|
* ZERO_PAGE is a special page that is used for zero-initialized
|
|
* data and COW.
|
|
*/
|
|
void *empty_zero_page;
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
#ifdef CONFIG_MMU
|
|
|
|
pg_data_t pg_data_map[MAX_NUMNODES];
|
|
EXPORT_SYMBOL(pg_data_map);
|
|
|
|
int m68k_virt_to_node_shift;
|
|
|
|
#ifndef CONFIG_SINGLE_MEMORY_CHUNK
|
|
pg_data_t *pg_data_table[65];
|
|
EXPORT_SYMBOL(pg_data_table);
|
|
#endif
|
|
|
|
void __init m68k_setup_node(int node)
|
|
{
|
|
#ifndef CONFIG_SINGLE_MEMORY_CHUNK
|
|
struct m68k_mem_info *info = m68k_memory + node;
|
|
int i, end;
|
|
|
|
i = (unsigned long)phys_to_virt(info->addr) >> __virt_to_node_shift();
|
|
end = (unsigned long)phys_to_virt(info->addr + info->size - 1) >> __virt_to_node_shift();
|
|
for (; i <= end; i++) {
|
|
if (pg_data_table[i])
|
|
pr_warn("overlap at %u for chunk %u\n", i, node);
|
|
pg_data_table[i] = pg_data_map + node;
|
|
}
|
|
#endif
|
|
node_set_online(node);
|
|
}
|
|
|
|
#else /* CONFIG_MMU */
|
|
|
|
/*
|
|
* paging_init() continues the virtual memory environment setup which
|
|
* was begun by the code in arch/head.S.
|
|
* The parameters are pointers to where to stick the starting and ending
|
|
* addresses of available kernel virtual memory.
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
/*
|
|
* Make sure start_mem is page aligned, otherwise bootmem and
|
|
* page_alloc get different views of the world.
|
|
*/
|
|
unsigned long end_mem = memory_end & PAGE_MASK;
|
|
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
|
|
|
|
high_memory = (void *) end_mem;
|
|
|
|
empty_zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
|
|
if (!empty_zero_page)
|
|
panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
|
|
__func__, PAGE_SIZE, PAGE_SIZE);
|
|
|
|
/*
|
|
* Set up SFC/DFC registers (user data space).
|
|
*/
|
|
set_fs (USER_DS);
|
|
|
|
zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
|
|
free_area_init(zones_size);
|
|
}
|
|
|
|
#endif /* CONFIG_MMU */
|
|
|
|
void free_initmem(void)
|
|
{
|
|
#ifndef CONFIG_MMU_SUN3
|
|
free_initmem_default(-1);
|
|
#endif /* CONFIG_MMU_SUN3 */
|
|
}
|
|
|
|
#if defined(CONFIG_MMU) && !defined(CONFIG_COLDFIRE)
|
|
#define VECTORS &vectors[0]
|
|
#else
|
|
#define VECTORS _ramvec
|
|
#endif
|
|
|
|
static inline void init_pointer_tables(void)
|
|
{
|
|
#if defined(CONFIG_MMU) && !defined(CONFIG_SUN3) && !defined(CONFIG_COLDFIRE)
|
|
int i, j;
|
|
|
|
/* insert pointer tables allocated so far into the tablelist */
|
|
init_pointer_table(kernel_pg_dir, TABLE_PGD);
|
|
for (i = 0; i < PTRS_PER_PGD; i++) {
|
|
pud_t *pud = (pud_t *)&kernel_pg_dir[i];
|
|
pmd_t *pmd_dir;
|
|
|
|
if (!pud_present(*pud))
|
|
continue;
|
|
|
|
pmd_dir = (pmd_t *)pgd_page_vaddr(kernel_pg_dir[i]);
|
|
init_pointer_table(pmd_dir, TABLE_PMD);
|
|
|
|
for (j = 0; j < PTRS_PER_PMD; j++) {
|
|
pmd_t *pmd = &pmd_dir[j];
|
|
pte_t *pte_dir;
|
|
|
|
if (!pmd_present(*pmd))
|
|
continue;
|
|
|
|
pte_dir = (pte_t *)__pmd_page(*pmd);
|
|
init_pointer_table(pte_dir, TABLE_PTE);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
/* this will put all memory onto the freelists */
|
|
memblock_free_all();
|
|
init_pointer_tables();
|
|
mem_init_print_info(NULL);
|
|
}
|