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Commit 6f0142d5 authored by Chris Metcalf's avatar Chris Metcalf
Browse files

tile: allow "initrd" boot argument for kexec 



This enables support for "kexec --initrd" for tile.

Signed-off-by: default avatarChris Metcalf <cmetcalf@tilera.com>
parent b2eca427

arch/tile/kernel/setup.c

+42 −0
Original line number Diff line number Diff line
@@ -694,6 +694,25 @@ static void __init setup_bootmem_allocator(void) 
		reserve_bootmem(m->addr, m->size, 0);

	}



#ifdef CONFIG_BLK_DEV_INITRD

	if (initrd_start) {

		/* Make sure the initrd memory region is not modified. */

		if (reserve_bootmem(initrd_start, initrd_end - initrd_start,

				    BOOTMEM_EXCLUSIVE)) {

			pr_crit("The initrd memory region has been polluted. Disabling it.\n");

			initrd_start = 0;

			initrd_end = 0;

		} else {

			/*

			 * Translate initrd_start & initrd_end from PA to VA for

			 * future access.

			 */

			initrd_start += PAGE_OFFSET;

			initrd_end += PAGE_OFFSET;

		}

	}

#endif



#ifdef CONFIG_KEXEC

	if (crashk_res.start != crashk_res.end)

		reserve_bootmem(crashk_res.start, resource_size(&crashk_res), 0);
@@ -1095,6 +1114,10 @@ static void __init load_hv_initrd(void) 
	int fd, rc;

	void *initrd;



	/* If initrd has already been set, skip initramfs file in hvfs. */

	if (initrd_start)

		return;



	fd = hv_fs_findfile((HV_VirtAddr) initramfs_file);

	if (fd == HV_ENOENT) {

		if (set_initramfs_file) {
@@ -1133,6 +1156,25 @@ void __init free_initrd_mem(unsigned long begin, unsigned long end) 
	free_bootmem(__pa(begin), end - begin);

}



static int __init setup_initrd(char *str)

{

	char *endp;

	unsigned long initrd_size;



	initrd_size = str ? simple_strtoul(str, &endp, 0) : 0;

	if (initrd_size == 0 || *endp != '@')

		return -EINVAL;



	initrd_start = simple_strtoul(endp+1, &endp, 0);

	if (initrd_start == 0)

		return -EINVAL;



	initrd_end = initrd_start + initrd_size;



	return 0;

}

early_param("initrd", setup_initrd);



#else

static inline void load_hv_initrd(void) {}

#endif /* CONFIG_BLK_DEV_INITRD */