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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>
This commit is contained in:
Noam Camus 2012-09-09 11:37:40 +03:00 committed by Vineet Gupta
parent 80c1fe4c0d
commit d6579e99bc
1 changed files with 27 additions and 0 deletions
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27
arch/arc/mm/init.c
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@ -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 --------------------------------*/