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payload: Only load DTs that are compatible with this device

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Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2021-10-18 18:26:27 +09:00
parent 120ac16493
commit 39d1d9a904
1 changed files with 22 additions and 3 deletions
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25
src/payload.c
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@ -1,6 +1,7 @@
/* SPDX-License-Identifier: MIT */
#include "payload.h"
#include "adt.h"
#include "assert.h"
#include "heapblock.h"
#include "kboot.h"
@ -21,6 +22,7 @@ static const u8 kernel_magic[] = {'A', 'R', 'M', 0x64}; // at 0x38
static const u8 cpio_magic[] = {'0', '7', '0', '7', '0'}; // '1' or '2' next
static const u8 empty[] = {0, 0, 0, 0};
static char expect_compatible[256];
static struct kernel_header *kernel = NULL;
static void *fdt = NULL;
@ -91,9 +93,12 @@ static void *decompress_xz(void *p, size_t size)
static void *load_fdt(void *p, size_t size)
{
fdt = p;
assert(!size || size == fdt_totalsize(fdt));
return ((u8 *)p) + fdt_totalsize(fdt);
if (fdt_node_check_compatible(p, 0, expect_compatible) == 0) {
printf("DT matches this target (%s)\n", expect_compatible);
fdt = p;
}
assert(!size || size == fdt_totalsize(p));
return ((u8 *)p) + fdt_totalsize(p);
}
static void *load_cpio(void *p, size_t size)
@ -199,6 +204,20 @@ static void *load_one_payload(void *start, size_t size)
int payload_run(void)
{
const char *target = adt_getprop(adt, 0, "target-type", NULL);
if (target) {
strcpy(expect_compatible, "apple,");
char *p = expect_compatible + strlen(expect_compatible);
while (*target && p != expect_compatible + sizeof(expect_compatible) - 1) {
*p++ = tolower(*target++);
}
*p = 0;
printf("Devicetree compatible value: %s\n", expect_compatible);
} else {
printf("Cannot find target type! %p %p\n", target, adt);
return -1;
}
void *p = _payload_start;
while (p)