35af89eb49
This makes 2 changes to clean up the flat device tree handling logic in the zImage wrapper. First, there were two callbacks from the dt_ops structure used for producing a final flat tree to pass to the kerne: dt_ops.ft_pack() which packed the flat tree (possibly a no-op) and dt_ops.ft_addr() which retreived the address of the final blob. Since they were only ever called together, this patch combines the two into a single new callback, dt_ops.finalize(). This new callback does whatever platform-dependent things are necessary to produce a final flat device tree blob, and returns the blob's addres. Second, the current logic calls the kernel with a flat device tree if one is build into the zImage wrapper, otherwise it boots the kernel with a PROM pointer, expecting the kernel to copy the OF device tree itself. This approach precludes the possibility of the platform wrapper code building a flat device tree from whatever platform-specific information firmware provides. Thus, this patch takes the more sensible approach of invoking the kernel with a flat tree if the dt_ops.finalize callback provides one (by whatever means). So, the dt_ops.finalize callback can be NULL, or can be a function which returns NULL. In either case, the zImage wrapper logic assumes that this is a platform with OF and invokes the kernel accordingly. Signed-off-by: David Gibson <dwg@au1.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/*
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* This file does the necessary interface mapping between the bootwrapper
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* device tree operations and the interface provided by shared source
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* files flatdevicetree.[ch].
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*
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* Author: Mark A. Greer <mgreer@mvista.com>
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*
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* 2006 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <stddef.h>
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#include "flatdevtree.h"
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#include "ops.h"
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static struct ft_cxt cxt;
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static void *ft_finddevice(const char *name)
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{
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return ft_find_device(&cxt, name);
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}
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static int ft_getprop(const void *phandle, const char *propname, void *buf,
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const int buflen)
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{
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return ft_get_prop(&cxt, phandle, propname, buf, buflen);
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}
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static int ft_setprop(const void *phandle, const char *propname,
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const void *buf, const int buflen)
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{
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return ft_set_prop(&cxt, phandle, propname, buf, buflen);
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}
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static unsigned long ft_finalize(void)
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{
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ft_end_tree(&cxt);
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return (unsigned long)cxt.bph;
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}
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int ft_init(void *dt_blob, unsigned int max_size, unsigned int max_find_device)
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{
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dt_ops.finddevice = ft_finddevice;
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dt_ops.getprop = ft_getprop;
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dt_ops.setprop = ft_setprop;
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dt_ops.finalize = ft_finalize;
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return ft_open(&cxt, dt_blob, max_size, max_find_device,
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platform_ops.realloc);
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}
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