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Uniformize source code ref: bootloader

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Using "extern char linker_symbol[]" notation
cf https://sourceware.org/binutils/docs/ld/Source-Code-Reference.html
This commit is contained in:
Philippe Teuwen 2021-05-14 00:05:40 +02:00
parent 13a9afa36d
commit 0f80c6dea4
1 changed files with 22 additions and 27 deletions
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49
bootrom/bootrom.c
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@ -13,10 +13,9 @@
#define DEBUG 0
struct common_area common_area __attribute__((section(".commonarea")));
unsigned int start_addr, end_addr, bootrom_unlocked;
extern char _bootrom_start, _bootrom_end, _flash_end;
extern uint32_t _flash_start[AT91C_IFLASH_NB_OF_PAGES * AT91C_IFLASH_PAGE_SIZE / sizeof(uint32_t)];
extern uint32_t _osimage_entry;
uint32_t start_addr, end_addr;
bool bootrom_unlocked;
extern char _bootrom_start[], _bootrom_end[], _flash_start[], _flash_end[], _osimage_entry[];
static int reply_old(uint64_t cmd, uint64_t arg0, uint64_t arg1, uint64_t arg2, void *data, size_t len) {
PacketResponseOLD txcmd;
@ -76,7 +75,7 @@ static void Fatal(void) {
}
static void UsbPacketReceived(uint8_t *packet) {
int dont_ack = 0;
bool ack = true;
PacketCommandOLD *c = (PacketCommandOLD *)packet;
//if ( len != sizeof(PacketCommandOLD`)) Fatal();
@ -85,7 +84,7 @@ static void UsbPacketReceived(uint8_t *packet) {
switch (c->cmd) {
case CMD_DEVICE_INFO: {
dont_ack = 1;
ack = false;
arg0 = DEVICE_INFO_FLAG_BOOTROM_PRESENT |
DEVICE_INFO_FLAG_CURRENT_MODE_BOOTROM |
DEVICE_INFO_FLAG_UNDERSTANDS_START_FLASH |
@ -99,14 +98,14 @@ static void UsbPacketReceived(uint8_t *packet) {
break;
case CMD_CHIP_INFO: {
dont_ack = 1;
ack = false;
arg0 = *(AT91C_DBGU_CIDR);
reply_old(CMD_CHIP_INFO, arg0, 0, 0, 0, 0);
}
break;
case CMD_BL_VERSION: {
dont_ack = 1;
ack = false;
arg0 = BL_VERSION_1_0_0;
reply_old(CMD_BL_VERSION, arg0, 0, 0, 0, 0);
}
@ -125,13 +124,13 @@ static void UsbPacketReceived(uint8_t *packet) {
offset = (AT91C_IFLASH_NB_OF_PAGES / 2) * AT91C_IFLASH_PAGE_SIZE / sizeof(uint32_t);
}
for (int i = 0 + (64 * j); i < 64 + (64 * j); i++) {
_flash_start[offset + i] = c->d.asDwords[i];
((uint32_t *)_flash_start)[offset + i] = c->d.asDwords[i];
}
/* Check that the address that we are supposed to write to is within our allowed region */
if (((flash_address + AT91C_IFLASH_PAGE_SIZE - 1) >= end_addr) || (flash_address < start_addr)) {
/* Disallow write */
dont_ack = 1;
ack = false;
reply_old(CMD_NACK, 0, 0, 0, 0, 0);
} else {
@ -144,7 +143,7 @@ static void UsbPacketReceived(uint8_t *packet) {
uint32_t sr;
while (!((sr = efc_bank->EFC_FSR) & AT91C_MC_FRDY));
if (sr & (AT91C_MC_LOCKE | AT91C_MC_PROGE)) {
dont_ack = 1;
ack = false;
reply_old(CMD_NACK, sr, 0, 0, 0, 0);
}
}
@ -159,28 +158,24 @@ static void UsbPacketReceived(uint8_t *packet) {
case CMD_START_FLASH: {
if (c->arg[2] == START_FLASH_MAGIC)
bootrom_unlocked = 1;
bootrom_unlocked = true;
else
bootrom_unlocked = 0;
bootrom_unlocked = false;
int prot_start = (int)&_bootrom_start;
int prot_end = (int)&_bootrom_end;
int allow_start = (int)&_flash_start;
int allow_end = (int)&_flash_end;
int cmd_start = c->arg[0];
int cmd_end = c->arg[1];
uint32_t cmd_start = c->arg[0];
uint32_t cmd_end = c->arg[1];
/* Only allow command if the bootrom is unlocked, or the parameters are outside of the protected
* bootrom area. In any case they must be within the flash area.
*/
if ((bootrom_unlocked || ((cmd_start >= prot_end) || (cmd_end < prot_start))) &&
(cmd_start >= allow_start) &&
(cmd_end <= allow_end)) {
if ((bootrom_unlocked || ((cmd_start >= (uint32_t)_bootrom_end) || (cmd_end < (uint32_t)_bootrom_start))) &&
(cmd_start >= (uint32_t)_flash_start) &&
(cmd_end <= (uint32_t)_flash_end)) {
start_addr = cmd_start;
end_addr = cmd_end;
} else {
start_addr = end_addr = 0;
dont_ack = 1;
ack = false;
reply_old(CMD_NACK, 0, 0, 0, 0, 0);
}
}
@ -192,14 +187,14 @@ static void UsbPacketReceived(uint8_t *packet) {
break;
}
if (!dont_ack)
if (ack)
reply_old(CMD_ACK, arg0, 0, 0, 0, 0);
}
static void flash_mode(void) {
start_addr = 0;
end_addr = 0;
bootrom_unlocked = 0;
bootrom_unlocked = false;
uint8_t rx[sizeof(PacketCommandOLD)];
common_area.command = COMMON_AREA_COMMAND_NONE;
if (!common_area.flags.button_pressed && BUTTON_PRESS())
@ -324,12 +319,12 @@ void BootROM(void) {
if ((common_area.command == COMMON_AREA_COMMAND_ENTER_FLASH_MODE) ||
(!common_area.flags.button_pressed && BUTTON_PRESS()) ||
(_osimage_entry == 0xffffffffU)) {
(*(uint32_t*)_osimage_entry == 0xffffffffU)) {
flash_mode();
} else {
// clear button status, even if button still pressed
common_area.flags.button_pressed = 0;
// jump to Flash address of the osimage entry point (LSBit set for thumb mode)
__asm("bx %0\n" : : "r"(((int)&_osimage_entry) | 0x1));
__asm("bx %0\n" : : "r"(((uint32_t)_osimage_entry) | 0x1));
}
}