kevin/linux
1
Fork 0
Code
151f8cc116
linux/arch/m32r/mm/init.c
Dave Hansen 22a9835c35 [PATCH] unify PFN_* macros 
Just about every architecture defines some macros to do operations on pfns.
 They're all virtually identical.  This patch consolidates all of them.

One minor glitch is that at least i386 uses them in a very skeletal header
file.  To keep away from #include dependency hell, I stuck the new
definitions in a new, isolated header.

Of all of the implementations, sh64 is the only one that varied by a bit.
It used some masks to ensure that any sign-extension got ripped away before
the arithmetic is done.  This has been posted to that sh64 maintainers and
the development list.

Compiles on x86, x86_64, ia64 and ppc64.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 08:44:48 -08:00

256 lines
6.6 KiB
C
Raw Blame History

/*
* 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 <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>
/* References to section boundaries */
extern char _text, _etext, _edata;
extern char __init_begin, __init_end;
pgd_t swapper_pg_dir[1024];
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
void show_mem(void)
{
int total = 0, reserved = 0;
int shared = 0, cached = 0;
int highmem = 0;
struct page *page;
pg_data_t *pgdat;
unsigned long i;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n",nr_swap_pages<<(PAGE_SHIFT-10));
for_each_online_pgdat(pgdat) {
unsigned long flags;
pgdat_resize_lock(pgdat, &flags);
for (i = 0; i < pgdat->node_spanned_pages; ++i) {
page = pgdat_page_nr(pgdat, i);
total++;
if (PageHighMem(page))
highmem++;
if (PageReserved(page))
reserved++;
else if (PageSwapCache(page))
cached++;
else if (page_count(page))
shared += page_count(page) - 1;
}
pgdat_resize_unlock(pgdat, &flags);
}
printk("%d pages of RAM\n", total);
printk("%d pages of HIGHMEM\n",highmem);
printk("%d reserved pages\n",reserved);
printk("%d pages shared\n",shared);
printk("%d pages swap cached\n",cached);
}
/*
* 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
static unsigned long hole_pages;
/*
* 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_boot_start >> PAGE_SHIFT)
#define MAX_LOW_PFN(nid) (NODE_DATA(nid)->bdata->node_low_pfn)
#ifndef CONFIG_DISCONTIGMEM
unsigned long __init zone_sizes_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
unsigned long max_dma;
unsigned long low;
unsigned long start_pfn;
#ifdef CONFIG_MMU
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, NODE_DATA(0), zones_size, start_pfn, 0);
return 0;
}
#else /* CONFIG_DISCONTIGMEM */
extern unsigned long 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 */
hole_pages = zone_sizes_init();
}
int __init reservedpages_count(void)
{
int reservedpages, nid, i;
reservedpages = 0;
for_each_online_node(nid) {
unsigned long flags;
pgdat_resize_lock(NODE_DATA(nid), &flags);
for (i = 0 ; i < MAX_LOW_PFN(nid) - START_PFN(nid) ; i++)
if (PageReserved(nid_page_nr(nid, i)))
reservedpages++;
pgdat_resize_unlock(NODE_DATA(nid), &flags);
}
return reservedpages;
}
/*======================================================================*
* mem_init() :
* orig : arch/sh/mm/init.c
*======================================================================*/
void __init mem_init(void)
{
int codesize, reservedpages, datasize, initsize;
int nid;
#ifndef CONFIG_MMU
extern unsigned long memory_end;
#endif
num_physpages = 0;
for_each_online_node(nid)
num_physpages += MAX_LOW_PFN(nid) - START_PFN(nid) + 1;
num_physpages -= hole_pages;
#ifndef CONFIG_DISCONTIGMEM
max_mapnr = num_physpages;
#endif /* CONFIG_DISCONTIGMEM */
#ifdef CONFIG_MMU
high_memory = (void *)__va(PFN_PHYS(MAX_LOW_PFN(0)));
#else
high_memory = (void *)(memory_end & PAGE_MASK);
#endif /* CONFIG_MMU */
/* clear the zero-page */
memset(empty_zero_page, 0, PAGE_SIZE);
/* this will put all low memory onto the freelists */
for_each_online_node(nid)
totalram_pages += free_all_bootmem_node(NODE_DATA(nid));
reservedpages = reservedpages_count() - hole_pages;
codesize = (unsigned long) &_etext - (unsigned long)&_text;
datasize = (unsigned long) &_edata - (unsigned long)&_etext;
initsize = (unsigned long) &__init_end - (unsigned long)&__init_begin;
printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
"%dk reserved, %dk data, %dk init)\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
num_physpages << (PAGE_SHIFT-10),
codesize >> 10,
reservedpages << (PAGE_SHIFT-10),
datasize >> 10,
initsize >> 10);
}
/*======================================================================*
* free_initmem() :
* orig : arch/sh/mm/init.c
*======================================================================*/
void free_initmem(void)
{
unsigned long addr;
addr = (unsigned long)(&__init_begin);
for (; addr < (unsigned long)(&__init_end); addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));
free_page(addr);
totalram_pages++;
}
printk (KERN_INFO "Freeing unused kernel memory: %dk freed\n", \
(int)(&__init_end - &__init_begin) >> 10);
}
#ifdef CONFIG_BLK_DEV_INITRD
/*======================================================================*
* free_initrd_mem() :
* orig : arch/sh/mm/init.c
*======================================================================*/
void free_initrd_mem(unsigned long start, unsigned long end)
{
unsigned long p;
for (p = start; p < end; p += PAGE_SIZE) {
ClearPageReserved(virt_to_page(p));
init_page_count(virt_to_page(p));
free_page(p);
totalram_pages++;
}
printk (KERN_INFO "Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
}
#endif
View Git Blame Copy Permalink