You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
61 lines
1.8 KiB
61 lines
1.8 KiB
From 9041c96ab5bd29d85ca95cffa44c755f68ae6bb1 Mon Sep 17 00:00:00 2001
|
|
From: John Crispin <blogic@openwrt.org>
|
|
Date: Sat, 13 Apr 2013 13:15:47 +0200
|
|
Subject: [PATCH 121/137] MIPS: add detect_memory_region()
|
|
|
|
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/
|
|
---
|
|
arch/mips/include/asm/bootinfo.h | 1 +
|
|
arch/mips/kernel/setup.c | 20 ++++++++++++++++++++
|
|
2 files changed, 21 insertions(+)
|
|
|
|
--- a/arch/mips/include/asm/bootinfo.h
|
|
+++ b/arch/mips/include/asm/bootinfo.h
|
|
@@ -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);
|
|
--- a/arch/mips/kernel/setup.c
|
|
+++ b/arch/mips/kernel/setup.c
|
|
@@ -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>
|
|
@@ -122,6 +123,25 @@ void __init add_memory_region(phys_t sta
|
|
boot_mem_map.nr_map++;
|
|
}
|
|
|
|
+void __init detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max)
|
|
+{
|
|
+ phys_t size;
|
|
+
|
|
+ for (size = sz_min; size < sz_max; size <<= 1) {
|
|
+ if (!memcmp(detect_memory_region,
|
|
+ detect_memory_region + size, 1024))
|
|
+ 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;
|
|
|