153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* linux/arch/m32r/mm/init.c
|
|
*
|
|
* Copyright (c) 2001, 2002 Hitoshi Yamamoto
|
|
*
|
|
* Some code taken from sh version.
|
|
* Copyright (C) 1999 Niibe Yutaka
|
|
* Based on linux/arch/i386/mm/init.c:
|
|
* Copyright (C) 1995 Linus Torvalds
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/nodemask.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/gfp.h>
|
|
#include <asm/types.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/setup.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/sections.h>
|
|
|
|
pgd_t swapper_pg_dir[1024];
|
|
|
|
/*
|
|
* Cache of MMU context last used.
|
|
*/
|
|
#ifndef CONFIG_SMP
|
|
unsigned long mmu_context_cache_dat;
|
|
#else
|
|
unsigned long mmu_context_cache_dat[NR_CPUS];
|
|
#endif
|
|
|
|
/*
|
|
* function prototype
|
|
*/
|
|
void __init paging_init(void);
|
|
void __init mem_init(void);
|
|
void free_initmem(void);
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long, unsigned long);
|
|
#endif
|
|
|
|
/* It'd be good if these lines were in the standard header file. */
|
|
#define START_PFN(nid) (NODE_DATA(nid)->bdata->node_min_pfn)
|
|
#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
|
|
|
|
#ifndef CONFIG_DISCONTIGMEM
|
|
void __init zone_sizes_init(void)
|
|
{
|
|
unsigned long zones_size[MAX_NR_ZONES] = {0, };
|
|
unsigned long start_pfn;
|
|
|
|
#ifdef CONFIG_MMU
|
|
{
|
|
unsigned long low;
|
|
unsigned long max_dma;
|
|
|
|
start_pfn = START_PFN(0);
|
|
max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
|
|
low = MAX_LOW_PFN(0);
|
|
|
|
if (low < max_dma) {
|
|
zones_size[ZONE_DMA] = low - start_pfn;
|
|
zones_size[ZONE_NORMAL] = 0;
|
|
} else {
|
|
zones_size[ZONE_DMA] = low - start_pfn;
|
|
zones_size[ZONE_NORMAL] = low - max_dma;
|
|
}
|
|
}
|
|
#else
|
|
zones_size[ZONE_DMA] = 0 >> PAGE_SHIFT;
|
|
zones_size[ZONE_NORMAL] = __MEMORY_SIZE >> PAGE_SHIFT;
|
|
start_pfn = __MEMORY_START >> PAGE_SHIFT;
|
|
#endif /* CONFIG_MMU */
|
|
|
|
free_area_init_node(0, zones_size, start_pfn, 0);
|
|
}
|
|
#else /* CONFIG_DISCONTIGMEM */
|
|
extern void zone_sizes_init(void);
|
|
#endif /* CONFIG_DISCONTIGMEM */
|
|
|
|
/*======================================================================*
|
|
* paging_init() : sets up the page tables
|
|
*======================================================================*/
|
|
void __init paging_init(void)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
int i;
|
|
pgd_t *pg_dir;
|
|
|
|
/* We don't need kernel mapping as hardware support that. */
|
|
pg_dir = swapper_pg_dir;
|
|
|
|
for (i = 0 ; i < USER_PTRS_PER_PGD * 2 ; i++)
|
|
pgd_val(pg_dir[i]) = 0;
|
|
#endif /* CONFIG_MMU */
|
|
zone_sizes_init();
|
|
}
|
|
|
|
/*======================================================================*
|
|
* mem_init() :
|
|
* orig : arch/sh/mm/init.c
|
|
*======================================================================*/
|
|
void __init mem_init(void)
|
|
{
|
|
#ifndef CONFIG_MMU
|
|
extern unsigned long memory_end;
|
|
|
|
high_memory = (void *)(memory_end & PAGE_MASK);
|
|
#else
|
|
high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
|
|
#endif /* CONFIG_MMU */
|
|
|
|
/* clear the zero-page */
|
|
memset(empty_zero_page, 0, PAGE_SIZE);
|
|
|
|
set_max_mapnr(get_num_physpages());
|
|
free_all_bootmem();
|
|
mem_init_print_info(NULL);
|
|
}
|
|
|
|
/*======================================================================*
|
|
* free_initmem() :
|
|
* orig : arch/sh/mm/init.c
|
|
*======================================================================*/
|
|
void free_initmem(void)
|
|
{
|
|
free_initmem_default(-1);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
/*======================================================================*
|
|
* free_initrd_mem() :
|
|
* orig : arch/sh/mm/init.c
|
|
*======================================================================*/
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
free_reserved_area((void *)start, (void *)end, -1, "initrd");
|
|
}
|
|
#endif
|