d9d7e76981
Prepare for removing num_physpages and simplify mem_init(). Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Bob Liu <lliubbo@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
122 lines
3.1 KiB
C
122 lines
3.1 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 - CONFIG_PHY_RAM_BASE_ADDRESS) >> 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_node(0, zones_size,
|
|
CONFIG_PHY_RAM_BASE_ADDRESS >> PAGE_SHIFT, NULL);
|
|
}
|
|
|
|
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]));
|
|
|
|
#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)
|
|
{
|
|
char buf[64];
|
|
|
|
high_memory = (void *)(memory_end & PAGE_MASK);
|
|
max_mapnr = MAP_NR(high_memory);
|
|
printk(KERN_DEBUG "Kernel managed physical pages: %lu\n", max_mapnr);
|
|
|
|
/* This will put all low memory onto the freelists. */
|
|
free_all_bootmem();
|
|
|
|
snprintf(buf, sizeof(buf) - 1, "%uK DMA", DMA_UNCACHED_REGION >> 10);
|
|
mem_init_print_info(buf);
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_INITRD
|
|
void __init free_initrd_mem(unsigned long start, unsigned long end)
|
|
{
|
|
#ifndef CONFIG_MPU
|
|
free_reserved_area((void *)start, (void *)end, -1, "initrd");
|
|
#endif
|
|
}
|
|
#endif
|
|
|
|
void __init_refok free_initmem(void)
|
|
{
|
|
#if defined CONFIG_RAMKERNEL && !defined CONFIG_MPU
|
|
free_initmem_default(-1);
|
|
if (memory_start == (unsigned long)(&__init_end))
|
|
memory_start = (unsigned long)(&__init_begin);
|
|
#endif
|
|
}
|