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Commit 1406bc2f authored by Jeremy Kerr's avatar Jeremy Kerr Committed by Grant Likely
Browse files

of/flattree: use callback to setup initrd from /chosen 



At present, the fdt code sets the kernel-wide initrd_start and
initrd_end variables when parsing /chosen. On ARM, we only set these
once the bootmem has been reserved.

This change adds an arch hook to setup the initrd from the device
tree:

 void early_init_dt_setup_initrd_arch(unsigned long start,
				      unsigned long end);

The arch-specific code can then setup the initrd however it likes.

Compiled on powerpc, with CONFIG_BLK_DEV_INITRD=y and =n.

Signed-off-by: default avatarJeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: default avatarGrant Likely <grant.likely@secretlab.ca>
parent 50ab2fe1

arch/microblaze/kernel/prom.c

+10 −0
Original line number Diff line number Diff line
@@ -118,6 +118,16 @@ void __init early_init_devtree(void *params) 
	pr_debug(" <- early_init_devtree()\n");

}



#ifdef CONFIG_BLK_DEV_INITRD

void __init early_init_dt_setup_initrd_arch(unsigned long start,

		unsigned long end)

{

	initrd_start = (unsigned long)__va(start);

	initrd_end = (unsigned long)__va(end);

	initrd_below_start_ok = 1;

}

#endif



/*******

 *

 * New implementation of the OF "find" APIs, return a refcounted

arch/powerpc/kernel/prom.c

+10 −0
Original line number Diff line number Diff line
@@ -510,6 +510,16 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size) 
	memstart_addr = min((u64)memstart_addr, base);

}



#ifdef CONFIG_BLK_DEV_INITRD

void __init early_init_dt_setup_initrd_arch(unsigned long start,

		unsigned long end)

{

	initrd_start = (unsigned long)__va(start);

	initrd_end = (unsigned long)__va(end);

	initrd_below_start_ok = 1;

}

#endif



static void __init early_reserve_mem(void)

{

	u64 base, size;

drivers/of/fdt.c

+11 −16
Original line number Diff line number Diff line
@@ -384,28 +384,23 @@ unsigned long __init unflatten_dt_node(unsigned long mem, 
 */

void __init early_init_dt_check_for_initrd(unsigned long node)

{

	unsigned long len;

	unsigned long start, end, len;

	u32 *prop;



	pr_debug("Looking for initrd properties... ");



	prop = of_get_flat_dt_prop(node, "linux,initrd-start", &len);

	if (prop) {

		initrd_start = (unsigned long)

				__va(of_read_ulong(prop, len/4));

	if (!prop)

		return;

	start = of_read_ulong(prop, len/4);



	prop = of_get_flat_dt_prop(node, "linux,initrd-end", &len);

		if (prop) {

			initrd_end = (unsigned long)

				__va(of_read_ulong(prop, len/4));

			initrd_below_start_ok = 1;

		} else {

			initrd_start = 0;

		}

	}

	if (!prop)

		return;

	end = of_read_ulong(prop, len/4);



	pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n",

		 initrd_start, initrd_end);

	early_init_dt_setup_initrd_arch(start, end);

	pr_debug("initrd_start=0x%lx  initrd_end=0x%lx\n", start, end);

}

#else

inline void early_init_dt_check_for_initrd(unsigned long node)

include/linux/of_fdt.h

+10 −0
Original line number Diff line number Diff line
@@ -80,6 +80,16 @@ extern int early_init_dt_scan_memory(unsigned long node, const char *uname, 
extern void early_init_dt_add_memory_arch(u64 base, u64 size);

extern u64 dt_mem_next_cell(int s, u32 **cellp);



/*

 * If BLK_DEV_INITRD, the fdt early init code will call this function,

 * to be provided by the arch code. start and end are specified as

 * physical addresses.

 */

#ifdef CONFIG_BLK_DEV_INITRD

extern void early_init_dt_setup_initrd_arch(unsigned long start,

					    unsigned long end);

#endif



/* Early flat tree scan hooks */

extern int early_init_dt_scan_root(unsigned long node, const char *uname,

				   int depth, void *data);