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MIPS: add detect_memory_region()

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Add a generic way of detecting the available RAM. This function is based on the
implementation already used by ath79.

Signed-off-by: John Crispin <blogic@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/5178/
This commit is contained in:
John Crispin 2013-04-13 13:15:47 +02:00 committed by Ralf Baechle
parent 9d50094dfe
commit 4d9f77d252
2 changed files with 23 additions and 0 deletions
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1
arch/mips/include/asm/bootinfo.h
View File

@ -104,6 +104,7 @@ struct boot_mem_map {
extern struct boot_mem_map boot_mem_map;
extern void add_memory_region(phys_t start, phys_t size, long type);
extern void detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max);
extern void prom_init(void);
extern void prom_free_prom_memory(void);

22
arch/mips/kernel/setup.c
View File

@ -23,6 +23,7 @@
#include <linux/pfn.h>
#include <linux/debugfs.h>
#include <linux/kexec.h>
#include <linux/sizes.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
@ -77,6 +78,8 @@ EXPORT_SYMBOL(mips_io_port_base);
static struct resource code_resource = { .name = "Kernel code", };
static struct resource data_resource = { .name = "Kernel data", };
static void *detect_magic __initdata = detect_memory_region;
void __init add_memory_region(phys_t start, phys_t size, long type)
{
int x = boot_mem_map.nr_map;
@ -122,6 +125,25 @@ void __init add_memory_region(phys_t start, phys_t size, long type)
boot_mem_map.nr_map++;
}
void __init detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max)
{
void *dm = &detect_magic;
phys_t size;
for (size = sz_min; size < sz_max; size <<= 1) {
if (!memcmp(dm, dm + size, sizeof(detect_magic)))
break;
}
pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
((unsigned long long) size) / SZ_1M,
(unsigned long long) start,
((unsigned long long) sz_min) / SZ_1M,
((unsigned long long) sz_max) / SZ_1M);
add_memory_region(start, size, BOOT_MEM_RAM);
}
static void __init print_memory_map(void)
{
int i;