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/*
* Copyright (C) 2016 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <stdlib.h>
#include <linux/string.h>
#include <fsl_fastboot.h>
#include <fsl_avb.h>
/* as libavb's bootctl doesn't have the get_var support
* we add the getvar support on our side ...*/
#ifndef MAX_PTN
#define MAX_PTN 32
#endif
#define SLOT_NUM 2
static char *slot_suffix[SLOT_NUM] = {"_a", "_b"};
static int strcmp_l1(const char *s1, const char *s2) {
if (!s1 || !s2)
return -1;
return strncmp(s1, s2, strlen(s1));
}
static bool slot_is_bootable(AvbABSlotData* slot) {
return slot->priority > 0 &&
(slot->successful_boot || (slot->tries_remaining > 0));
}
int slotidx_from_suffix(char *suffix) {
int slot = -1;
if (!strcmp(suffix, "_a") ||
!strcmp(suffix, "a"))
slot = 0;
else if (!strcmp(suffix, "_b") ||
!strcmp(suffix, "b"))
slot = 1;
return slot;
}
bool is_slotvar_avb(char *cmd) {
assert(cmd != NULL);
if (!strcmp_l1("has-slot:", cmd) ||
!strcmp_l1("slot-successful:", cmd) ||
!strcmp_l1("slot-count", cmd) ||
!strcmp_l1("slot-suffixes", cmd) ||
!strcmp_l1("current-slot", cmd) ||
!strcmp_l1("slot-unbootable:", cmd) ||
!strcmp_l1("slot-retry-count:", cmd))
return true;
return false;
}
static int get_curr_slot(AvbABData *ab_data) {
if (slot_is_bootable(&ab_data->slots[0]) &&
slot_is_bootable(&ab_data->slots[1])) {
if (ab_data->slots[1].priority > ab_data->slots[0].priority)
return 1;
else
return 0;
} else if (slot_is_bootable(&ab_data->slots[0]))
return 0;
else if (slot_is_bootable(&ab_data->slots[1]))
return 1;
else
return -1;
}
extern struct fastboot_ptentry g_ptable[MAX_PTN];
extern unsigned int g_pcount;
static bool has_slot(char *cmd) {
unsigned int n;
char *ptr;
for (n = 0; n < g_pcount; n++) {
ptr = strstr(g_ptable[n].name, cmd);
if (ptr != NULL) {
ptr += strlen(cmd);
if (!strcmp(ptr, "_a") || !strcmp(ptr, "_b"))
return true;
}
}
return false;
}
int get_slotvar_avb(AvbABOps *ab_ops, char *cmd, char *buffer, size_t size) {
AvbABData ab_data;
AvbABSlotData *slot_data;
int slot;
assert(ab_ops != NULL && cmd != NULL && buffer != NULL);
char *str = cmd;
if (!strcmp_l1("has-slot:", cmd)) {
str += strlen("has-slot:");
if (has_slot(str))
strlcpy(buffer, "yes", size);
else
strlcpy(buffer, "no", size);
return 0;
} else if (!strcmp_l1("slot-suffixes", cmd)) {
strlcpy(buffer, "_a,_b", size);
return 0 ;
} else if (!strcmp_l1("slot-count", cmd)) {
strlcpy(buffer, "2", size);
return 0 ;
}
/* load ab meta */
if (ab_ops->read_ab_metadata == NULL ||
ab_ops->read_ab_metadata(ab_ops, &ab_data) != AVB_IO_RESULT_OK) {
strlcpy(buffer, "ab data read error", size);
return -1 ;
}
if (!strcmp_l1("current-slot", cmd)) {
int curr = get_curr_slot(&ab_data);
if (curr >= 0 && curr < SLOT_NUM)
strlcpy(buffer, slot_suffix[curr], size);
else {
strlcpy(buffer, "no bootable slot", size);
return -1;
}
} else if (!strcmp_l1("slot-successful:", cmd)) {
str += strlen("slot-successful:");
slot = slotidx_from_suffix(str);
if (slot < 0) {
strlcpy(buffer, "no such slot", size);
return -1;
} else {
slot_data = &ab_data.slots[slot];
bool succ = (slot_data->successful_boot != 0);
strlcpy(buffer, succ ? "yes" : "no", size);
}
} else if (!strcmp_l1("slot-unbootable:", cmd)) {
str += strlen("slot-unbootable:");
slot = slotidx_from_suffix(str);
if (slot < 0) {
strlcpy(buffer, "no such slot", size);
return -1;
} else {
slot_data = &ab_data.slots[slot];
bool bootable = slot_is_bootable(slot_data);
strlcpy(buffer, bootable ? "no" : "yes", size);
}
} else if (!strcmp_l1("slot-retry-count:", cmd)) {
str += strlen("slot-retry-count:");
slot = slotidx_from_suffix(str);
if (slot < 0) {
strlcpy(buffer, "no such slot", size);
return -1;
}
else {
slot_data = &ab_data.slots[slot];
char var[7];
sprintf(var, "%d",
slot_data->tries_remaining);
strlcpy(buffer, var, size);
}
} else {
strlcpy(buffer, "no such slot command", size);
return -1;
}
return 0;
}
char *select_slot(AvbABOps *ab_ops) {
AvbABData ab_data;
int curr;
assert(ab_ops != NULL);
/* load ab meta */
if (ab_ops->read_ab_metadata == NULL ||
ab_ops->read_ab_metadata(ab_ops, &ab_data) != AVB_IO_RESULT_OK) {
return NULL;
}
curr = get_curr_slot(&ab_data);
if (curr >= 0 && curr < SLOT_NUM)
return slot_suffix[curr];
else
return NULL;
}
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