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device_tree: add qemu_fdt_setprop_string_array helper 

A string array in device tree is simply a series of \0 terminated
strings next to each other. As libfdt doesn't support that directly
we need to build it ourselves.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20210303173642.3805-4-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée 2021-03-03 17:36:38 +00:00
parent c65d7080d8
commit 78da6a1bca
2 changed files with 43 additions and 0 deletions
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17
include/sysemu/device_tree.h
View File

@ -70,6 +70,23 @@ int qemu_fdt_setprop_u64(void *fdt, const char *node_path,
const char *property, uint64_t val);
int qemu_fdt_setprop_string(void *fdt, const char *node_path,
const char *property, const char *string);
/**
* qemu_fdt_setprop_string_array: set a string array property
*
* @fdt: pointer to the dt blob
* @name: node name
* @prop: property array
* @array: pointer to an array of string pointers
* @len: length of array
*
* assigns a string array to a property. This function converts and
* array of strings to a sequential string with \0 separators before
* setting the property.
*/
int qemu_fdt_setprop_string_array(void *fdt, const char *node_path,
const char *prop, char **array, int len);
int qemu_fdt_setprop_phandle(void *fdt, const char *node_path,
const char *property,
const char *target_node_path);

26
softmmu/device_tree.c
View File

@ -21,6 +21,7 @@
#include "qemu/error-report.h"
#include "qemu/option.h"
#include "qemu/bswap.h"
#include "qemu/cutils.h"
#include "sysemu/device_tree.h"
#include "sysemu/sysemu.h"
#include "hw/loader.h"
@ -397,6 +398,31 @@ int qemu_fdt_setprop_string(void *fdt, const char *node_path,
return r;
}
/*
* libfdt doesn't allow us to add string arrays directly but they are
* test a series of null terminated strings with a length. We build
* the string up here so we can calculate the final length.
*/
int qemu_fdt_setprop_string_array(void *fdt, const char *node_path,
const char *prop, char **array, int len)
{
int ret, i, total_len = 0;
char *str, *p;
for (i = 0; i < len; i++) {
total_len += strlen(array[i]) + 1;
}
p = str = g_malloc0(total_len);
for (i = 0; i < len; i++) {
int len = strlen(array[i]) + 1;
pstrcpy(p, len, array[i]);
p += len;
}
ret = qemu_fdt_setprop(fdt, node_path, prop, str, total_len);
g_free(str);
return ret;
}
const void *qemu_fdt_getprop(void *fdt, const char *node_path,
const char *property, int *lenp, Error **errp)
{