292 lines
7.6 KiB
C
292 lines
7.6 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/dma-map-ops.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h> /* mem_init */
|
|
#include <linux/initrd.h>
|
|
#include <linux/of_fdt.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/pfn.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/export.h>
|
|
|
|
#include <asm/page.h>
|
|
#include <asm/mmu_context.h>
|
|
#include <asm/pgalloc.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/tlb.h>
|
|
#include <asm/fixmap.h>
|
|
|
|
/* Use for MMU and noMMU because of PCI generic code */
|
|
int mem_init_done;
|
|
|
|
char *klimit = _end;
|
|
|
|
/*
|
|
* Initialize the bootmem system and give it all the memory we
|
|
* have available.
|
|
*/
|
|
unsigned long memory_start;
|
|
EXPORT_SYMBOL(memory_start);
|
|
unsigned long memory_size;
|
|
EXPORT_SYMBOL(memory_size);
|
|
unsigned long lowmem_size;
|
|
|
|
EXPORT_SYMBOL(min_low_pfn);
|
|
EXPORT_SYMBOL(max_low_pfn);
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
static void __init highmem_init(void)
|
|
{
|
|
pr_debug("%x\n", (u32)PKMAP_BASE);
|
|
map_page(PKMAP_BASE, 0, 0); /* XXX gross */
|
|
pkmap_page_table = virt_to_kpte(PKMAP_BASE);
|
|
}
|
|
|
|
static void __meminit highmem_setup(void)
|
|
{
|
|
unsigned long pfn;
|
|
|
|
for (pfn = max_low_pfn; pfn < max_pfn; ++pfn) {
|
|
struct page *page = pfn_to_page(pfn);
|
|
|
|
/* FIXME not sure about */
|
|
if (!memblock_is_reserved(pfn << PAGE_SHIFT))
|
|
free_highmem_page(page);
|
|
}
|
|
}
|
|
#endif /* CONFIG_HIGHMEM */
|
|
|
|
/*
|
|
* 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];
|
|
int idx;
|
|
|
|
/* Setup fixmaps */
|
|
for (idx = 0; idx < __end_of_fixed_addresses; idx++)
|
|
clear_fixmap(idx);
|
|
|
|
/* Clean every zones */
|
|
memset(zones_size, 0, sizeof(zones_size));
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
highmem_init();
|
|
|
|
zones_size[ZONE_DMA] = max_low_pfn;
|
|
zones_size[ZONE_HIGHMEM] = max_pfn;
|
|
#else
|
|
zones_size[ZONE_DMA] = max_pfn;
|
|
#endif
|
|
|
|
/* We don't have holes in memory map */
|
|
free_area_init(zones_size);
|
|
}
|
|
|
|
void __init setup_memory(void)
|
|
{
|
|
/*
|
|
* 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)
|
|
*/
|
|
|
|
/* 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 */
|
|
max_mapnr = memory_size >> PAGE_SHIFT;
|
|
max_low_pfn = ((u64)memory_start + (u64)lowmem_size) >> PAGE_SHIFT;
|
|
max_pfn = ((u64)memory_start + (u64)memory_size) >> PAGE_SHIFT;
|
|
|
|
pr_info("%s: max_mapnr: %#lx\n", __func__, max_mapnr);
|
|
pr_info("%s: min_low_pfn: %#lx\n", __func__, min_low_pfn);
|
|
pr_info("%s: max_low_pfn: %#lx\n", __func__, max_low_pfn);
|
|
pr_info("%s: max_pfn: %#lx\n", __func__, max_pfn);
|
|
|
|
paging_init();
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
high_memory = (void *)__va(memory_start + lowmem_size - 1);
|
|
|
|
/* this will put all memory onto the freelists */
|
|
memblock_free_all();
|
|
#ifdef CONFIG_HIGHMEM
|
|
highmem_setup();
|
|
#endif
|
|
|
|
mem_init_done = 1;
|
|
}
|
|
|
|
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;
|
|
memblock.memory.regions[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 (!memblock.reserved.cnt) {
|
|
pr_emerg("Error memory count\n");
|
|
machine_restart(NULL);
|
|
}
|
|
|
|
if ((u32) memblock.memory.regions[0].size < 0x400000) {
|
|
pr_emerg("Memory must be greater than 4MB\n");
|
|
machine_restart(NULL);
|
|
}
|
|
|
|
if ((u32) memblock.memory.regions[0].size < kernel_tlb) {
|
|
pr_emerg("Kernel size is greater than memory node\n");
|
|
machine_restart(NULL);
|
|
}
|
|
|
|
/* Find main memory where the kernel is */
|
|
memory_start = (u32) memblock.memory.regions[0].base;
|
|
lowmem_size = memory_size = (u32) memblock.memory.regions[0].size;
|
|
|
|
if (lowmem_size > CONFIG_LOWMEM_SIZE) {
|
|
lowmem_size = CONFIG_LOWMEM_SIZE;
|
|
#ifndef CONFIG_HIGHMEM
|
|
memory_size = lowmem_size;
|
|
#endif
|
|
}
|
|
|
|
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));
|
|
memblock_reserve(kstart, ksize);
|
|
|
|
#if defined(CONFIG_BLK_DEV_INITRD)
|
|
/* Remove the init RAM disk from the available memory. */
|
|
if (initrd_start) {
|
|
unsigned long size;
|
|
size = initrd_end - initrd_start;
|
|
memblock_reserve(__virt_to_phys(initrd_start), size);
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_INITRD */
|
|
|
|
/* Initialize the MMU hardware */
|
|
mmu_init_hw();
|
|
|
|
/* Map in all of RAM starting at CONFIG_KERNEL_START */
|
|
mapin_ram();
|
|
|
|
/* Extend vmalloc and ioremap area as big as possible */
|
|
#ifdef CONFIG_HIGHMEM
|
|
ioremap_base = ioremap_bot = PKMAP_BASE;
|
|
#else
|
|
ioremap_base = ioremap_bot = FIXADDR_START;
|
|
#endif
|
|
|
|
/* Initialize the context management stuff */
|
|
mmu_context_init();
|
|
|
|
/* Shortly after that, the entire linear mapping will be available */
|
|
/* This will also cause that unflatten device tree will be allocated
|
|
* inside 768MB limit */
|
|
memblock_set_current_limit(memory_start + lowmem_size - 1);
|
|
|
|
parse_early_param();
|
|
|
|
early_init_fdt_scan_reserved_mem();
|
|
|
|
/* CMA initialization */
|
|
dma_contiguous_reserve(memory_start + lowmem_size - 1);
|
|
|
|
memblock_dump_all();
|
|
}
|
|
|
|
static const pgprot_t protection_map[16] = {
|
|
[VM_NONE] = PAGE_NONE,
|
|
[VM_READ] = PAGE_READONLY_X,
|
|
[VM_WRITE] = PAGE_COPY,
|
|
[VM_WRITE | VM_READ] = PAGE_COPY_X,
|
|
[VM_EXEC] = PAGE_READONLY,
|
|
[VM_EXEC | VM_READ] = PAGE_READONLY_X,
|
|
[VM_EXEC | VM_WRITE] = PAGE_COPY,
|
|
[VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_X,
|
|
[VM_SHARED] = PAGE_NONE,
|
|
[VM_SHARED | VM_READ] = PAGE_READONLY_X,
|
|
[VM_SHARED | VM_WRITE] = PAGE_SHARED,
|
|
[VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED_X,
|
|
[VM_SHARED | VM_EXEC] = PAGE_READONLY,
|
|
[VM_SHARED | VM_EXEC | VM_READ] = PAGE_READONLY_X,
|
|
[VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED,
|
|
[VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_X
|
|
};
|
|
DECLARE_VM_GET_PAGE_PROT
|