linuxdebug/arch/microblaze/mm/init.c

308 lines
7.8 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();
}
void * __ref zalloc_maybe_bootmem(size_t size, gfp_t mask)
{
void *p;
if (mem_init_done) {
p = kzalloc(size, mask);
} else {
p = memblock_alloc(size, SMP_CACHE_BYTES);
if (!p)
panic("%s: Failed to allocate %zu bytes\n",
__func__, size);
}
return p;
}
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