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dt: Add global option to set phandle start offset

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If anyone outside of QEMU wants to mess with a QEMU generated device tree,
he needs to know which range phandles are valid in. So let's expose a
machine option that an external program can use to set the start allocate
id for phandles in QEMU.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2012-06-06 01:01:23 +02:00
parent 3627757e32
commit 4b1b1c896f
2 changed files with 31 additions and 1 deletions
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28
device_tree.c
View File

@ -22,6 +22,8 @@
#include "qemu-common.h"
#include "device_tree.h"
#include "hw/loader.h"
#include "qemu-option.h"
#include "qemu-config.h"
#include <libfdt.h>
@ -200,7 +202,31 @@ int qemu_devtree_setprop_phandle(void *fdt, const char *node_path,
uint32_t qemu_devtree_alloc_phandle(void *fdt)
{
static int phandle = 0x8000;
static int phandle = 0x0;
/*
* We need to find out if the user gave us special instruction at
* which phandle id to start allocting phandles.
*/
if (!phandle) {
QemuOpts *machine_opts;
machine_opts = qemu_opts_find(qemu_find_opts("machine"), 0);
if (machine_opts) {
const char *phandle_start;
phandle_start = qemu_opt_get(machine_opts, "phandle_start");
if (phandle_start) {
phandle = strtoul(phandle_start, NULL, 0);
}
}
}
if (!phandle) {
/*
* None or invalid phandle given on the command line, so fall back to
* default starting point.
*/
phandle = 0x8000;
}
return phandle++;
}

4
qemu-config.c
View File

@ -587,6 +587,10 @@ static QemuOptsList qemu_machine_opts = {
.name = "dumpdtb",
.type = QEMU_OPT_STRING,
.help = "Dump current dtb to a file and quit",
}, {
.name = "phandle_start",
.type = QEMU_OPT_STRING,
.help = "The first phandle ID we may generate dynamically",
},
{ /* End of list */ }
},