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>
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@ -10,6 +10,9 @@
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#include <linux/mm.h>
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#include <linux/bootmem.h>
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#include <linux/memblock.h>
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#ifdef CONFIG_BLK_DEV_INITRD
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#include <linux/initrd.h>
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#endif
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#include <linux/swap.h>
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#include <linux/module.h>
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#include <asm/page.h>
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@ -42,6 +45,24 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
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pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz));
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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static int __init early_initrd(char *p)
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{
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unsigned long start, size;
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char *endp;
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start = memparse(p, &endp);
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if (*endp == ',') {
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size = memparse(endp + 1, NULL);
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initrd_start = (unsigned long)__va(start);
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initrd_end = (unsigned long)__va(start + size);
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}
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return 0;
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}
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early_param("initrd", early_initrd);
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#endif
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/*
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* First memory setup routine called from setup_arch()
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* 1. setup swapper's mm @init_mm
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@ -80,6 +101,12 @@ void __init setup_arch_memory(void)
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memblock_reserve(CONFIG_LINUX_LINK_BASE,
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__pa(_end) - CONFIG_LINUX_LINK_BASE);
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#ifdef CONFIG_BLK_DEV_INITRD
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/*------------- reserve initrd image -----------------------*/
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if (initrd_start)
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memblock_reserve(__pa(initrd_start), initrd_end - initrd_start);
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#endif
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memblock_dump_all();
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/*-------------- node setup --------------------------------*/
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