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payload: Support passing arbitrary /chosen arguments

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Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2022-03-09 20:42:01 +09:00
parent 78c8c4d7d6
commit 0a8a593cdc
1 changed files with 25 additions and 5 deletions
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30
src/payload.c
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@ -142,11 +142,16 @@ static void *load_kernel(void *p, size_t size)
}
}
#define MAX_VAR_NAME 32
#define MAX_VAR_NAME 64
#define MAX_VAR_SIZE 1024
#define IS_VAR(x) !strncmp((char *)*p, x, strlen(x))
#define MAX_CHOSEN_VARS 16
static size_t chosen_cnt = 0;
static char *chosen[MAX_CHOSEN_VARS];
static bool check_var(u8 **p)
{
char *val = memchr(*p, '=', MAX_VAR_NAME + 1);
@ -159,14 +164,18 @@ static bool check_var(u8 **p)
if (!end)
return false;
if (IS_VAR("boot-args=")) {
printf("Found a variable at %p: %s\n", *p, (char *)*p);
if (IS_VAR("chosen.")) {
*end = 0;
kboot_set_chosen("bootargs", val);
if (chosen_cnt >= MAX_CHOSEN_VARS)
printf("Too many chosen vars, ignoring %s='%s'\n", *p, val);
else
chosen[chosen_cnt++] = (char *)*p;
} else {
return false;
printf("Unknown variable %s\n", *p);
}
printf("Found a variable at %p: %s\n", *p, (char *)*p);
*p = (u8 *)(end + 1);
return true;
}
@ -226,6 +235,8 @@ int payload_run(void)
return -1;
}
chosen_cnt = 0;
void *p = _payload_start;
while (p)
@ -234,6 +245,15 @@ int payload_run(void)
if (kernel && fdt) {
smp_start_secondaries();
for (int i = 0; i < MAX_CHOSEN_VARS; i++) {
char *val = memchr(chosen[i], '=', MAX_VAR_NAME + 1);
assert(val);
val[-1] = 0; // Terminate var name
if (kboot_set_chosen(chosen[i] + 7, val) < 1)
printf("Failed to kboot set %s='%s'\n", chosen[i], val);
}
if (kboot_prepare_dt(fdt)) {
printf("Failed to prepare FDT!\n");
return -1;