62 lines
1.8 KiB
Diff
62 lines
1.8 KiB
Diff
From 2ccca2ac0b54eb21890412c888cf5a5bda656bba Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sat, 13 Apr 2013 13:15:47 +0200
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Subject: [PATCH 121/164] MIPS: add detect_memory_region()
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Add a generic way of detecting the available RAM. This function is based on the
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implementation already used by ath79.
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Signed-off-by: John Crispin <blogic@openwrt.org>
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Patchwork: http://patchwork.linux-mips.org/patch/5178/
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---
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arch/mips/include/asm/bootinfo.h | 1 +
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arch/mips/kernel/setup.c | 20 ++++++++++++++++++++
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2 files changed, 21 insertions(+)
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--- a/arch/mips/include/asm/bootinfo.h
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+++ b/arch/mips/include/asm/bootinfo.h
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@@ -104,6 +104,7 @@ struct boot_mem_map {
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extern struct boot_mem_map boot_mem_map;
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extern void add_memory_region(phys_t start, phys_t size, long type);
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+extern void detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max);
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extern void prom_init(void);
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extern void prom_free_prom_memory(void);
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--- a/arch/mips/kernel/setup.c
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+++ b/arch/mips/kernel/setup.c
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@@ -23,6 +23,7 @@
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#include <linux/pfn.h>
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#include <linux/debugfs.h>
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#include <linux/kexec.h>
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+#include <linux/sizes.h>
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#include <asm/addrspace.h>
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#include <asm/bootinfo.h>
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@@ -122,6 +123,25 @@ void __init add_memory_region(phys_t sta
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boot_mem_map.nr_map++;
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}
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+void __init detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max)
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+{
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+ phys_t size;
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+
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+ for (size = sz_min; size < sz_max; size <<= 1) {
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+ if (!memcmp(detect_memory_region,
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+ detect_memory_region + size, 1024))
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+ break;
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+ }
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+
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+ pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
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+ ((unsigned long long) size) / SZ_1M,
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+ (unsigned long long) start,
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+ ((unsigned long long) sz_min) / SZ_1M,
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+ ((unsigned long long) sz_max) / SZ_1M);
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+
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+ add_memory_region(start, size, BOOT_MEM_RAM);
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+}
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+
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static void __init print_memory_map(void)
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{
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int i;
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