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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/types.h>
#include <linux/init.h>
#include <linux/libfdt.h>
#include <linux/ctype.h>
#include "pi.h"
u64 get_kaslr_seed(uintptr_t dtb_pa)
{
int node, len;
fdt64_t *prop;
u64 ret;
node = fdt_path_offset((void *)dtb_pa, "/chosen");
if (node < 0)
return 0;
prop = fdt_getprop_w((void *)dtb_pa, node, "kaslr-seed", &len);
if (!prop || len != sizeof(u64))
return 0;
ret = fdt64_to_cpu(*prop);
*prop = 0;
return ret;
}
/**
* fdt_device_is_available - check if a device is available for use
*
* @fdt: pointer to the device tree blob
* @node: offset of the node whose property to find
*
* Returns true if the status property is absent or set to "okay" or "ok",
* false otherwise
*/
static bool fdt_device_is_available(const void *fdt, int node)
{
const char *status;
int statlen;
status = fdt_getprop(fdt, node, "status", &statlen);
if (!status)
return true;
if (statlen > 0) {
if (!strcmp(status, "okay") || !strcmp(status, "ok"))
return true;
}
return false;
}
/* Copy of fdt_nodename_eq_ */
static int fdt_node_name_eq(const void *fdt, int offset,
const char *s)
{
int olen;
int len = strlen(s);
const char *p = fdt_get_name(fdt, offset, &olen);
if (!p || olen < len)
/* short match */
return 0;
if (memcmp(p, s, len) != 0)
return 0;
if (p[len] == '\0')
return 1;
else if (!memchr(s, '@', len) && (p[len] == '@'))
return 1;
else
return 0;
}
/**
* isa_string_contains - check if isa string contains an extension
*
* @isa_str: isa string to search
* @ext_name: the extension to search for
*
* Returns true if the extension is in the given isa string,
* false otherwise
*/
static bool isa_string_contains(const char *isa_str, const char *ext_name)
{
size_t i, single_end, len = strlen(ext_name);
char ext_end;
/* Error must contain rv32/64 */
if (strlen(isa_str) < 4)
return false;
if (len == 1) {
single_end = strcspn(isa_str, "sSxXzZ");
/* Search for single chars between rv32/64 and multi-letter extensions */
for (i = 4; i < single_end; i++) {
if (tolower(isa_str[i]) == ext_name[0])
return true;
}
return false;
}
/* Skip to start of multi-letter extensions */
isa_str = strpbrk(isa_str, "sSxXzZ");
while (isa_str) {
if (strncasecmp(isa_str, ext_name, len) == 0) {
ext_end = isa_str[len];
/* Check if matches the whole extension. */
if (ext_end == '\0' || ext_end == '_')
return true;
}
/* Multi-letter extensions must be split from other multi-letter
* extensions with an "_", the end of a multi-letter extension will
* either be the null character or the "_" at the start of the next
* multi-letter extension.
*/
isa_str = strchr(isa_str, '_');
if (isa_str)
isa_str++;
}
return false;
}
/**
* early_cpu_isa_ext_available - check if cpu node has an extension
*
* @fdt: pointer to the device tree blob
* @node: offset of the cpu node
* @ext_name: the extension to search for
*
* Returns true if the cpu node has the extension,
* false otherwise
*/
static bool early_cpu_isa_ext_available(const void *fdt, int node, const char *ext_name)
{
const void *prop;
int len;
prop = fdt_getprop(fdt, node, "riscv,isa-extensions", &len);
if (prop && fdt_stringlist_contains(prop, len, ext_name))
return true;
prop = fdt_getprop(fdt, node, "riscv,isa", &len);
if (prop && isa_string_contains(prop, ext_name))
return true;
return false;
}
/**
* fdt_early_match_extension_isa - check if all cpu nodes have an extension
*
* @fdt: pointer to the device tree blob
* @ext_name: the extension to search for
*
* Returns true if the all available the cpu nodes have the extension,
* false otherwise
*/
bool fdt_early_match_extension_isa(const void *fdt, const char *ext_name)
{
int node, parent;
bool ret = false;
parent = fdt_path_offset(fdt, "/cpus");
if (parent < 0)
return false;
fdt_for_each_subnode(node, fdt, parent) {
if (!fdt_node_name_eq(fdt, node, "cpu"))
continue;
if (!fdt_device_is_available(fdt, node))
continue;
if (!early_cpu_isa_ext_available(fdt, node, ext_name))
return false;
ret = true;
}
return ret;
}
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