diff options
Diffstat (limited to 'arch/blackfin/kernel/early_printk.c')
| -rw-r--r-- | arch/blackfin/kernel/early_printk.c | 61 |
1 files changed, 57 insertions, 4 deletions
diff --git a/arch/blackfin/kernel/early_printk.c b/arch/blackfin/kernel/early_printk.c index 9bf61706694f..6ec518a81113 100644 --- a/arch/blackfin/kernel/early_printk.c +++ b/arch/blackfin/kernel/early_printk.c @@ -38,13 +38,13 @@ extern struct console *bfin_earlyserial_init(unsigned int port, static struct console *early_console; -/* Default console - * Port n == ttyBFn - * cflags == UART output modes - */ +/* Default console */ #define DEFAULT_PORT 0 #define DEFAULT_CFLAG CS8|B57600 +/* Default console for early crashes */ +#define DEFAULT_EARLY_PORT "serial,uart0,57600" + #ifdef CONFIG_SERIAL_CORE /* What should get here is "0,57600" */ static struct console * __init earlyserial_init(char *buf) @@ -158,4 +158,57 @@ int __init setup_early_printk(char *buf) return 0; } +/* + * Set up a temporary Event Vector Table, so if something bad happens before + * the kernel is fully started, it doesn't vector off into somewhere we don't + * know + */ + +asmlinkage void __init init_early_exception_vectors(void) +{ + SSYNC(); + + /* cannot program in software: + * evt0 - emulation (jtag) + * evt1 - reset + */ + bfin_write_EVT2(early_trap); + bfin_write_EVT3(early_trap); + bfin_write_EVT5(early_trap); + bfin_write_EVT6(early_trap); + bfin_write_EVT7(early_trap); + bfin_write_EVT8(early_trap); + bfin_write_EVT9(early_trap); + bfin_write_EVT10(early_trap); + bfin_write_EVT11(early_trap); + bfin_write_EVT12(early_trap); + bfin_write_EVT13(early_trap); + bfin_write_EVT14(early_trap); + bfin_write_EVT15(early_trap); + CSYNC(); + + /* Set all the return from interupt, exception, NMI to a known place + * so if we do a RETI, RETX or RETN by mistake - we go somewhere known + * Note - don't change RETS - we are in a subroutine, or + * RETE - since it might screw up if emulator is attached + */ + asm("\tRETI = %0; RETX = %0; RETN = %0;\n" + : : "p"(early_trap)); + +} + +asmlinkage void __init early_trap_c(struct pt_regs *fp, void *retaddr) +{ + /* This can happen before the uart is initialized, so initialize + * the UART now + */ + if (likely(early_console == NULL)) + setup_early_printk(DEFAULT_EARLY_PORT); + + dump_bfin_regs(fp, retaddr); + dump_bfin_trace_buffer(); + + panic("Died early"); +} + early_param("earlyprintk", setup_early_printk); |