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authorNoam Camus <noamc@ezchip.com>2012-09-09 11:37:40 +0300
committerVineet Gupta <vgupta@synopsys.com>2014-03-26 14:31:27 +0530
commitd6579e99bc448a351279cea7469ab64a00d25ff8 (patch)
tree784445b9378b16692bf4c9657629d36ae5678493 /arch/arc
parent80c1fe4c0d2747c419a4290c7028c8776932164c (diff)
downloadlinux-linaro-stable-d6579e99bc448a351279cea7469ab64a00d25ff8.tar.gz
ARC: support external initrd
Currently ARC only supports embedded initrd. This patch enables external ones too. [vgupta: Changed from "rt_start"=start/"rd_size"=sz to unified "initrd"=start,sz] Signed-off-by: Noam Camus <noamc@ezchip.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc')
-rw-r--r--arch/arc/mm/init.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index 55e0a85bea78..523412369f70 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -10,6 +10,9 @@
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/memblock.h>
+#ifdef CONFIG_BLK_DEV_INITRD
+#include <linux/initrd.h>
+#endif
#include <linux/swap.h>
#include <linux/module.h>
#include <asm/page.h>
@@ -42,6 +45,24 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
}
+#ifdef CONFIG_BLK_DEV_INITRD
+static int __init early_initrd(char *p)
+{
+ unsigned long start, size;
+ char *endp;
+
+ start = memparse(p, &endp);
+ if (*endp == ',') {
+ size = memparse(endp + 1, NULL);
+
+ initrd_start = (unsigned long)__va(start);
+ initrd_end = (unsigned long)__va(start + size);
+ }
+ return 0;
+}
+early_param("initrd", early_initrd);
+#endif
+
/*
* First memory setup routine called from setup_arch()
* 1. setup swapper's mm @init_mm
@@ -80,6 +101,12 @@ void __init setup_arch_memory(void)
memblock_reserve(CONFIG_LINUX_LINK_BASE,
__pa(_end) - CONFIG_LINUX_LINK_BASE);
+#ifdef CONFIG_BLK_DEV_INITRD
+ /*------------- reserve initrd image -----------------------*/
+ if (initrd_start)
+ memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
+#endif
+
memblock_dump_all();
/*-------------- node setup --------------------------------*/