351 строка
9.3 KiB
C
351 строка
9.3 KiB
C
/*
|
|
* Copyright (C) 2007-2008 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2006 Atmark Techno, Inc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/bootmem.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/lmb.h>
|
|
#include <linux/mm.h> /* mem_init */
|
|
#include <linux/initrd.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/swap.h>
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
|
|
#ifndef CONFIG_MMU
|
|
unsigned int __page_offset;
|
|
EXPORT_SYMBOL(__page_offset);
|
|
|
|
#else
|
|
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
|
|
|
|
int mem_init_done;
|
|
static int init_bootmem_done;
|
|
#endif /* CONFIG_MMU */
|
|
|
|
char *klimit = _end;
|
|
|
|
/*
|
|
* Initialize the bootmem system and give it all the memory we
|
|
* have available.
|
|
*/
|
|
unsigned long memory_start;
|
|
unsigned long memory_end; /* due to mm/nommu.c */
|
|
unsigned long memory_size;
|
|
|
|
/*
|
|
* paging_init() sets up the page tables - in fact we've already done this.
|
|
*/
|
|
static void __init paging_init(void)
|
|
{
|
|
unsigned long zones_size[MAX_NR_ZONES];
|
|
|
|
/* Clean every zones */
|
|
memset(zones_size, 0, sizeof(zones_size));
|
|
|
|
/*
|
|
* old: we can DMA to/from any address.put all page into ZONE_DMA
|
|
* We use only ZONE_NORMAL
|
|
*/
|
|
zones_size[ZONE_NORMAL] = max_mapnr;
|
|
|
|
free_area_init(zones_size);
|
|
}
|
|
|
|
void __init setup_memory(void)
|
|
{
|
|
int i;
|
|
unsigned long map_size;
|
|
#ifndef CONFIG_MMU
|
|
u32 kernel_align_start, kernel_align_size;
|
|
|
|
/* Find main memory where is the kernel */
|
|
for (i = 0; i < lmb.memory.cnt; i++) {
|
|
memory_start = (u32) lmb.memory.region[i].base;
|
|
memory_end = (u32) lmb.memory.region[i].base
|
|
+ (u32) lmb.memory.region[i].size;
|
|
if ((memory_start <= (u32)_text) &&
|
|
((u32)_text <= memory_end)) {
|
|
memory_size = memory_end - memory_start;
|
|
PAGE_OFFSET = memory_start;
|
|
printk(KERN_INFO "%s: Main mem: 0x%x-0x%x, "
|
|
"size 0x%08x\n", __func__, memory_start,
|
|
memory_end, memory_size);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!memory_start || !memory_end) {
|
|
panic("%s: Missing memory setting 0x%08x-0x%08x\n",
|
|
__func__, memory_start, memory_end);
|
|
}
|
|
|
|
/* reservation of region where is the kernel */
|
|
kernel_align_start = PAGE_DOWN((u32)_text);
|
|
/* ALIGN can be remove because _end in vmlinux.lds.S is align */
|
|
kernel_align_size = PAGE_UP((u32)klimit) - kernel_align_start;
|
|
lmb_reserve(kernel_align_start, kernel_align_size);
|
|
printk(KERN_INFO "%s: kernel addr=0x%08x-0x%08x size=0x%08x\n",
|
|
__func__, kernel_align_start, kernel_align_start
|
|
+ kernel_align_size, kernel_align_size);
|
|
|
|
#endif
|
|
/*
|
|
* Kernel:
|
|
* start: base phys address of kernel - page align
|
|
* end: base phys address of kernel - page align
|
|
*
|
|
* min_low_pfn - the first page (mm/bootmem.c - node_boot_start)
|
|
* max_low_pfn
|
|
* max_mapnr - the first unused page (mm/bootmem.c - node_low_pfn)
|
|
* num_physpages - number of all pages
|
|
*/
|
|
|
|
/* memory start is from the kernel end (aligned) to higher addr */
|
|
min_low_pfn = memory_start >> PAGE_SHIFT; /* minimum for allocation */
|
|
/* RAM is assumed contiguous */
|
|
num_physpages = max_mapnr = memory_size >> PAGE_SHIFT;
|
|
max_pfn = max_low_pfn = memory_end >> PAGE_SHIFT;
|
|
|
|
printk(KERN_INFO "%s: max_mapnr: %#lx\n", __func__, max_mapnr);
|
|
printk(KERN_INFO "%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
|
|
printk(KERN_INFO "%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
|
|
|
|
/*
|
|
* Find an area to use for the bootmem bitmap.
|
|
* We look for the first area which is at least
|
|
* 128kB in length (128kB is enough for a bitmap
|
|
* for 4GB of memory, using 4kB pages), plus 1 page
|
|
* (in case the address isn't page-aligned).
|
|
*/
|
|
#ifndef CONFIG_MMU
|
|
map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
|
|
min_low_pfn, max_low_pfn);
|
|
#else
|
|
map_size = init_bootmem_node(&contig_page_data,
|
|
PFN_UP(TOPHYS((u32)_end)), min_low_pfn, max_low_pfn);
|
|
#endif
|
|
lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);
|
|
|
|
/* free bootmem is whole main memory */
|
|
free_bootmem(memory_start, memory_size);
|
|
|
|
/* reserve allocate blocks */
|
|
for (i = 0; i < lmb.reserved.cnt; i++) {
|
|
pr_debug("reserved %d - 0x%08x-0x%08x\n", i,
|
|
(u32) lmb.reserved.region[i].base,
|
|
(u32) lmb_size_bytes(&lmb.reserved, i));
|
|
reserve_bootmem(lmb.reserved.region[i].base,
|
|
lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
|
|
}
|
|
#ifdef CONFIG_MMU
|
|
init_bootmem_done = 1;
|
|
#endif
|
|
paging_init();
|
|
}
|
|
|
|
void free_init_pages(char *what, unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
|
|
for (addr = begin; addr < end; addr += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(addr));
|
|
init_page_count(virt_to_page(addr));
|
|
memset((void *)addr, 0xcc, PAGE_SIZE);
|
|
free_page(addr);
|
|
totalram_pages++;
|
|
}
|
|
printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
int pages = 0;
|
|
for (; start < end; start += PAGE_SIZE) {
|
|
ClearPageReserved(virt_to_page(start));
|
|
init_page_count(virt_to_page(start));
|
|
free_page(start);
|
|
totalram_pages++;
|
|
pages++;
|
|
}
|
|
printk(KERN_NOTICE "Freeing initrd memory: %dk freed\n", pages);
|
|
}
|
|
#endif
|
|
|
|
void free_initmem(void)
|
|
{
|
|
free_init_pages("unused kernel memory",
|
|
(unsigned long)(&__init_begin),
|
|
(unsigned long)(&__init_end));
|
|
}
|
|
|
|
/* FIXME from arch/powerpc/mm/mem.c*/
|
|
void show_mem(void)
|
|
{
|
|
printk(KERN_NOTICE "%s\n", __func__);
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
high_memory = (void *)__va(memory_end);
|
|
/* this will put all memory onto the freelists */
|
|
totalram_pages += free_all_bootmem();
|
|
|
|
printk(KERN_INFO "Memory: %luk/%luk available\n",
|
|
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
|
|
num_physpages << (PAGE_SHIFT-10));
|
|
#ifdef CONFIG_MMU
|
|
mem_init_done = 1;
|
|
#endif
|
|
}
|
|
|
|
#ifndef CONFIG_MMU
|
|
/* Check against bounds of physical memory */
|
|
int ___range_ok(unsigned long addr, unsigned long size)
|
|
{
|
|
return ((addr < memory_start) ||
|
|
((addr + size) > memory_end));
|
|
}
|
|
EXPORT_SYMBOL(___range_ok);
|
|
|
|
#else
|
|
int page_is_ram(unsigned long pfn)
|
|
{
|
|
return pfn < max_low_pfn;
|
|
}
|
|
|
|
/*
|
|
* Check for command-line options that affect what MMU_init will do.
|
|
*/
|
|
static void mm_cmdline_setup(void)
|
|
{
|
|
unsigned long maxmem = 0;
|
|
char *p = cmd_line;
|
|
|
|
/* Look for mem= option on command line */
|
|
p = strstr(cmd_line, "mem=");
|
|
if (p) {
|
|
p += 4;
|
|
maxmem = memparse(p, &p);
|
|
if (maxmem && memory_size > maxmem) {
|
|
memory_size = maxmem;
|
|
memory_end = memory_start + memory_size;
|
|
lmb.memory.region[0].size = memory_size;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* MMU_init_hw does the chip-specific initialization of the MMU hardware.
|
|
*/
|
|
static void __init mmu_init_hw(void)
|
|
{
|
|
/*
|
|
* The Zone Protection Register (ZPR) defines how protection will
|
|
* be applied to every page which is a member of a given zone. At
|
|
* present, we utilize only two of the zones.
|
|
* The zone index bits (of ZSEL) in the PTE are used for software
|
|
* indicators, except the LSB. For user access, zone 1 is used,
|
|
* for kernel access, zone 0 is used. We set all but zone 1
|
|
* to zero, allowing only kernel access as indicated in the PTE.
|
|
* For zone 1, we set a 01 binary (a value of 10 will not work)
|
|
* to allow user access as indicated in the PTE. This also allows
|
|
* kernel access as indicated in the PTE.
|
|
*/
|
|
__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
|
|
"mts rzpr, r11;"
|
|
: : : "r11");
|
|
}
|
|
|
|
/*
|
|
* MMU_init sets up the basic memory mappings for the kernel,
|
|
* including both RAM and possibly some I/O regions,
|
|
* and sets up the page tables and the MMU hardware ready to go.
|
|
*/
|
|
|
|
/* called from head.S */
|
|
asmlinkage void __init mmu_init(void)
|
|
{
|
|
unsigned int kstart, ksize;
|
|
|
|
if (!lmb.reserved.cnt) {
|
|
printk(KERN_EMERG "Error memory count\n");
|
|
machine_restart(NULL);
|
|
}
|
|
|
|
if ((u32) lmb.memory.region[0].size < 0x1000000) {
|
|
printk(KERN_EMERG "Memory must be greater than 16MB\n");
|
|
machine_restart(NULL);
|
|
}
|
|
/* Find main memory where the kernel is */
|
|
memory_start = (u32) lmb.memory.region[0].base;
|
|
memory_end = (u32) lmb.memory.region[0].base +
|
|
(u32) lmb.memory.region[0].size;
|
|
memory_size = memory_end - memory_start;
|
|
|
|
mm_cmdline_setup(); /* FIXME parse args from command line - not used */
|
|
|
|
/*
|
|
* Map out the kernel text/data/bss from the available physical
|
|
* memory.
|
|
*/
|
|
kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
|
|
/* kernel size */
|
|
ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
|
|
lmb_reserve(kstart, ksize);
|
|
|
|
#if defined(CONFIG_BLK_DEV_INITRD)
|
|
/* Remove the init RAM disk from the available memory. */
|
|
/* if (initrd_start) {
|
|
mem_pieces_remove(&phys_avail, __pa(initrd_start),
|
|
initrd_end - initrd_start, 1);
|
|
}*/
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
/* Initialize the MMU hardware */
|
|
mmu_init_hw();
|
|
|
|
/* Map in all of RAM starting at CONFIG_KERNEL_START */
|
|
mapin_ram();
|
|
|
|
#ifdef HIGHMEM_START_BOOL
|
|
ioremap_base = HIGHMEM_START;
|
|
#else
|
|
ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
|
|
#endif /* CONFIG_HIGHMEM */
|
|
ioremap_bot = ioremap_base;
|
|
|
|
/* Initialize the context management stuff */
|
|
mmu_context_init();
|
|
}
|
|
|
|
/* This is only called until mem_init is done. */
|
|
void __init *early_get_page(void)
|
|
{
|
|
void *p;
|
|
if (init_bootmem_done) {
|
|
p = alloc_bootmem_pages(PAGE_SIZE);
|
|
} else {
|
|
/*
|
|
* Mem start + 32MB -> here is limit
|
|
* because of mem mapping from head.S
|
|
*/
|
|
p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
|
|
memory_start + 0x2000000));
|
|
}
|
|
return p;
|
|
}
|
|
#endif /* CONFIG_MMU */
|