167 lines
4.6 KiB
C
167 lines
4.6 KiB
C
/*
|
|
* Copyright 2004-2009 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/swap.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/export.h>
|
|
#include <asm/bfin-global.h>
|
|
#include <asm/pda.h>
|
|
#include <asm/cplbinit.h>
|
|
#include <asm/early_printk.h>
|
|
#include "blackfin_sram.h"
|
|
|
|
/*
|
|
* ZERO_PAGE is a special page that is used for zero-initialized data and COW.
|
|
* Let the bss do its zero-init magic so we don't have to do it ourselves.
|
|
*/
|
|
char empty_zero_page[PAGE_SIZE] __attribute__((aligned(PAGE_SIZE)));
|
|
EXPORT_SYMBOL(empty_zero_page);
|
|
|
|
#ifndef CONFIG_EXCEPTION_L1_SCRATCH
|
|
#if defined CONFIG_SYSCALL_TAB_L1
|
|
__attribute__((l1_data))
|
|
#endif
|
|
static unsigned long exception_stack[NR_CPUS][1024];
|
|
#endif
|
|
|
|
struct blackfin_pda cpu_pda[NR_CPUS];
|
|
EXPORT_SYMBOL(cpu_pda);
|
|
|
|
/*
|
|
* 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 of the world
|
|
*/
|
|
unsigned long end_mem = memory_end & PAGE_MASK;
|
|
|
|
unsigned long zones_size[MAX_NR_ZONES] = {
|
|
[0] = 0,
|
|
[ZONE_DMA] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT,
|
|
[ZONE_NORMAL] = 0,
|
|
#ifdef CONFIG_HIGHMEM
|
|
[ZONE_HIGHMEM] = 0,
|
|
#endif
|
|
};
|
|
|
|
/* 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);
|
|
free_area_init(zones_size);
|
|
}
|
|
|
|
asmlinkage void __init init_pda(void)
|
|
{
|
|
unsigned int cpu = raw_smp_processor_id();
|
|
|
|
early_shadow_stamp();
|
|
|
|
/* Initialize the PDA fields holding references to other parts
|
|
of the memory. The content of such memory is still
|
|
undefined at the time of the call, we are only setting up
|
|
valid pointers to it. */
|
|
memset(&cpu_pda[cpu], 0, sizeof(cpu_pda[cpu]));
|
|
|
|
cpu_pda[0].next = &cpu_pda[1];
|
|
cpu_pda[1].next = &cpu_pda[0];
|
|
|
|
#ifdef CONFIG_EXCEPTION_L1_SCRATCH
|
|
cpu_pda[cpu].ex_stack = (unsigned long *)(L1_SCRATCH_START + \
|
|
L1_SCRATCH_LENGTH);
|
|
#else
|
|
cpu_pda[cpu].ex_stack = exception_stack[cpu + 1];
|
|
#endif
|
|
|
|
#ifdef CONFIG_SMP
|
|
cpu_pda[cpu].imask = 0x1f;
|
|
#endif
|
|
}
|
|
|
|
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_EXTMEM_ICACHEABLE) && 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)));
|
|
}
|
|
|
|
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));
|
|
|
|
if (memory_start == (unsigned long)(&__init_end))
|
|
memory_start = (unsigned long)(&__init_begin);
|
|
#endif
|
|
}
|