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bdk: fiq: watchdog handling

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`BDK_WATCHDOG_FIQ_ENABLE` enables watchdog handling.
`BDK_RESTART_BL_ON_WDT` causes a reload of bootloader on FIQ

These 2 are useful when wanting to detect and handle hangs.
This commit is contained in:
CTCaer 2022-06-29 12:12:03 +03:00
parent d38ddad873
commit 57c8fd1f8c
2 changed files with 22 additions and 5 deletions
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16
bdk/exception_handlers.S
View file

@ -97,6 +97,10 @@ _irq_setup:
MSR CPSR, #(MODE_IRQ | IRQ | FIQ) /* IRQ mode, IRQ/FIQ disabled */
LDR SP, =0x40040000
/* Setup FIQ stack pointer */
MSR CPSR, #(MODE_FIQ | IRQ | FIQ) /* FIQ mode, IRQ/FIQ disabled */
LDR SP, =0x40040000
/* Setup SYS stack pointer */
MSR CPSR, #(MODE_SYS | IRQ | FIQ) /* SYSTEM mode, IRQ/FIQ disabled */
LDR SP, =0x4003FF00 /* Will be changed later to DRAM */
@ -111,7 +115,9 @@ _irq_setup:
B ipl_main
B .
_reset:
.globl excp_reset
.type excp_reset, %function
excp_reset:
LDR R0, =EXCP_EN_ADDR
LDR R1, =0x30505645 /* EVP0 */
STR R1, [R0] /* EVP0 in EXCP_EN_ADDR */
@ -129,25 +135,25 @@ _reset_handler:
LDR R0, =EXCP_TYPE_ADDR
LDR R1, =0x545352 /* RST */
STR R1, [R0] /* RST in EXCP_TYPE_ADDR */
B _reset
B excp_reset
_undefined_handler:
LDR R0, =EXCP_TYPE_ADDR
LDR R1, =0x464455 /* UDF */
STR R1, [R0] /* UDF in EXCP_TYPE_ADDR */
B _reset
B excp_reset
_prefetch_abort_handler:
LDR R0, =EXCP_TYPE_ADDR
LDR R1, =0x54424150 /* PABT */
STR R1, [R0] /* PABT in EXCP_TYPE_ADDR */
B _reset
B excp_reset
_data_abort_handler:
LDR R0, =EXCP_TYPE_ADDR
LDR R1, =0x54424144 /* DABT */
STR R1, [R0] /* DABT in EXCP_TYPE_ADDR */
B _reset
B excp_reset
.globl irq_enable_cpu_irq_exceptions
.type irq_enable_cpu_irq_exceptions, %function

11
bdk/soc/irq.c
View file

@ -27,6 +27,7 @@
//#define DPRINTF(...) gfx_printf(__VA_ARGS__)
#define DPRINTF(...)
extern void excp_reset();
extern void irq_disable();
extern void irq_enable_cpu_irq_exceptions();
extern void irq_disable_cpu_irq_exceptions();
@ -271,4 +272,14 @@ void __attribute__ ((target("arm"), interrupt ("FIQ"))) fiq_handler()
len--;
}
*/
#ifdef BDK_WATCHDOG_FIQ_ENABLE
// Set watchdog timeout status and disable WDT and its FIQ signal.
watchdog_handle();
#ifdef BDK_RESTART_BL_ON_WDT
// Restart bootloader.
excp_reset();
#endif
#endif
}