From 9041c96ab5bd29d85ca95cffa44c755f68ae6bb1 Mon Sep 17 00:00:00 2001 From: John Crispin 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 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 #include #include +#include #include #include @@ -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;