mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-25 05:30:54 +07:00
214 lines
6.3 KiB
C
214 lines
6.3 KiB
C
/*
|
|
* File: arch/blackfin/mm/init.c
|
|
* Based on:
|
|
* Author:
|
|
*
|
|
* Created:
|
|
* Description:
|
|
*
|
|
* Modified:
|
|
* Copyright 2004-2007 Analog Devices Inc.
|
|
*
|
|
* Bugs: Enter bugs at http://blackfin.uclinux.org/
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, see the file COPYING, or write
|
|
* to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/swap.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/bfin-global.h>
|
|
#include <asm/l1layout.h>
|
|
#include "blackfin_sram.h"
|
|
|
|
/*
|
|
* BAD_PAGE is the page that is used for page faults when linux
|
|
* is out-of-memory. Older versions of linux just did a
|
|
* do_exit(), but using this instead means there is less risk
|
|
* for a process dying in kernel mode, possibly leaving a inode
|
|
* unused etc..
|
|
*
|
|
* BAD_PAGETABLE is the accompanying page-table: it is initialized
|
|
* to point to BAD_PAGE entries.
|
|
*
|
|
* ZERO_PAGE is a special page that is used for zero-initialized
|
|
* data and COW.
|
|
*/
|
|
static unsigned long empty_bad_page_table;
|
|
|
|
static unsigned long empty_bad_page;
|
|
|
|
unsigned long empty_zero_page;
|
|
|
|
void show_mem(void)
|
|
{
|
|
unsigned long i;
|
|
int free = 0, total = 0, reserved = 0, shared = 0;
|
|
|
|
int cached = 0;
|
|
printk(KERN_INFO "Mem-info:\n");
|
|
show_free_areas();
|
|
i = max_mapnr;
|
|
while (i-- > 0) {
|
|
total++;
|
|
if (PageReserved(mem_map + i))
|
|
reserved++;
|
|
else if (PageSwapCache(mem_map + i))
|
|
cached++;
|
|
else if (!page_count(mem_map + i))
|
|
free++;
|
|
else
|
|
shared += page_count(mem_map + i) - 1;
|
|
}
|
|
printk(KERN_INFO "%d pages of RAM\n", total);
|
|
printk(KERN_INFO "%d free pages\n", free);
|
|
printk(KERN_INFO "%d reserved pages\n", reserved);
|
|
printk(KERN_INFO "%d pages shared\n", shared);
|
|
printk(KERN_INFO "%d pages swap cached\n", cached);
|
|
}
|
|
|
|
/*
|
|
* paging_init() continues the virtual memory environment setup which
|
|
* was begun by the code in arch/head.S.
|
|
* The parameters are pointers to where to stick the starting and ending
|
|
* addresses of available kernel virtual memory.
|
|
*/
|
|
void __init paging_init(void)
|
|
{
|
|
/*
|
|
* make sure start_mem is page aligned, otherwise bootmem and
|
|
* page_alloc get different views og the world
|
|
*/
|
|
unsigned long end_mem = memory_end & PAGE_MASK;
|
|
|
|
pr_debug("start_mem is %#lx virtual_end is %#lx\n", PAGE_ALIGN(memory_start), end_mem);
|
|
|
|
/*
|
|
* initialize the bad page table and bad page to point
|
|
* to a couple of allocated pages
|
|
*/
|
|
empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
|
|
empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
|
|
empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
|
|
memset((void *)empty_zero_page, 0, PAGE_SIZE);
|
|
|
|
/*
|
|
* Set up SFC/DFC registers (user data space)
|
|
*/
|
|
set_fs(KERNEL_DS);
|
|
|
|
pr_debug("free_area_init -> start_mem is %#lx virtual_end is %#lx\n",
|
|
PAGE_ALIGN(memory_start), end_mem);
|
|
|
|
{
|
|
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
|
|
|
|
zones_size[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
|
|
zones_size[ZONE_NORMAL] = 0;
|
|
#ifdef CONFIG_HIGHMEM
|
|
zones_size[ZONE_HIGHMEM] = 0;
|
|
#endif
|
|
free_area_init(zones_size);
|
|
}
|
|
}
|
|
|
|
void __init mem_init(void)
|
|
{
|
|
unsigned int codek = 0, datak = 0, initk = 0;
|
|
unsigned int reservedpages = 0, freepages = 0;
|
|
unsigned long tmp;
|
|
unsigned long start_mem = memory_start;
|
|
unsigned long end_mem = memory_end;
|
|
|
|
end_mem &= PAGE_MASK;
|
|
high_memory = (void *)end_mem;
|
|
|
|
start_mem = PAGE_ALIGN(start_mem);
|
|
max_mapnr = num_physpages = MAP_NR(high_memory);
|
|
printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", num_physpages);
|
|
|
|
/* This will put all memory onto the freelists. */
|
|
totalram_pages = free_all_bootmem();
|
|
|
|
reservedpages = 0;
|
|
for (tmp = 0; tmp < max_mapnr; tmp++)
|
|
if (PageReserved(pfn_to_page(tmp)))
|
|
reservedpages++;
|
|
freepages = max_mapnr - reservedpages;
|
|
|
|
/* do not count in kernel image between _rambase and _ramstart */
|
|
reservedpages -= (_ramstart - _rambase) >> PAGE_SHIFT;
|
|
#if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
|
|
reservedpages += (_ramend - memory_end - DMA_UNCACHED_REGION) >> PAGE_SHIFT;
|
|
#endif
|
|
|
|
codek = (_etext - _stext) >> 10;
|
|
initk = (__init_end - __init_begin) >> 10;
|
|
datak = ((_ramstart - _rambase) >> 10) - codek - initk;
|
|
|
|
printk(KERN_INFO
|
|
"Memory available: %luk/%luk RAM, "
|
|
"(%uk init code, %uk kernel code, %uk data, %uk dma, %uk reserved)\n",
|
|
(unsigned long) freepages << (PAGE_SHIFT-10), _ramend >> 10,
|
|
initk, codek, datak, DMA_UNCACHED_REGION >> 10, (reservedpages << (PAGE_SHIFT-10)));
|
|
|
|
/* Initialize the blackfin L1 Memory. */
|
|
l1sram_init();
|
|
l1_data_sram_init();
|
|
l1_inst_sram_init();
|
|
|
|
/* Allocate this once; never free it. We assume this gives us a
|
|
pointer to the start of L1 scratchpad memory; panic if it
|
|
doesn't. */
|
|
tmp = (unsigned long)l1sram_alloc(sizeof(struct l1_scratch_task_info));
|
|
if (tmp != (unsigned long)L1_SCRATCH_TASK_INFO) {
|
|
printk(KERN_EMERG "mem_init(): Did not get the right address from l1sram_alloc: %08lx != %08lx\n",
|
|
tmp, (unsigned long)L1_SCRATCH_TASK_INFO);
|
|
panic("No L1, time to give up\n");
|
|
}
|
|
}
|
|
|
|
static void __init free_init_pages(const char *what, unsigned long begin, unsigned long end)
|
|
{
|
|
unsigned long addr;
|
|
/* next to check that the page we free is not a partial page */
|
|
for (addr = begin; addr + PAGE_SIZE <= 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 %s: %ldk freed\n", what, (end - begin) >> 10);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void __init free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
#ifndef CONFIG_MPU
|
|
free_init_pages("initrd memory", start, end);
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
void __init_refok free_initmem(void)
|
|
{
|
|
#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
|
|
free_init_pages("unused kernel memory",
|
|
(unsigned long)(&__init_begin),
|
|
(unsigned long)(&__init_end));
|
|
#endif
|
|
}
|