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| author |   Robin Getz <robin.getz@analog.com> | 2007-10-09 17:31:46 +0800 |
|---|---|---|
| committer |   Bryan Wu <bryan.wu@analog.com> | 2007-10-09 17:31:46 +0800 |
| commit | 337d390b3a9c1ce92a12bdb77b9ae6ded6273b12 (patch) | |
| tree | 2c870e325162c3d1a66390fb6d6db3e92de9e2eb /arch/blackfin/mach-common/entry.S | |
| parent | Blackfin arch: Enable earlyprintk earlier - so any error after our interrupt tables are set up will print out (diff) | |
| download | linux-dev-337d390b3a9c1ce92a12bdb77b9ae6ded6273b12.tar.xz linux-dev-337d390b3a9c1ce92a12bdb77b9ae6ded6273b12.zip | |
Blackfin arch: Print out debug info, as early as possible
Print out debug info, as early as possible - even before the
kernel initializes the interrupt vectors. Now we can print out debug
messages almost anytime during the boot process.
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/mach-common/entry.S')
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S index e2239361cac3..a56b231d94ce 100644 --- a/arch/blackfin/mach-common/entry.S +++ b/arch/blackfin/mach-common/entry.S @@ -835,12 +835,13 @@ ENTRY(_ex_trace_buff_full) P2 = [sp++]; P3 = [sp++]; jump _return_from_exception; +ENDPROC(_ex_trace_buff_full) #if CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN == 4 .data #else .section .l1.data.B -#endif +#endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN */ ENTRY(_trace_buff_offset) .long 0; ALIGN @@ -848,7 +849,45 @@ ENTRY(_software_trace_buff) .rept ((1 << CONFIG_DEBUG_BFIN_HWTRACE_EXPAND_LEN)*256); .long 0 .endr -#endif +#endif /* CONFIG_DEBUG_BFIN_HWTRACE_EXPAND */ + +#if CONFIG_EARLY_PRINTK +.section .init.text +ENTRY(_early_trap) + SAVE_ALL_SYS + trace_buffer_stop(p0,r0); + + /* Turn caches off, to ensure we don't get double exceptions */ + + P4.L = LO(IMEM_CONTROL); + P4.H = HI(IMEM_CONTROL); + + R5 = [P4]; /* Control Register*/ + BITCLR(R5,ENICPLB_P); + CLI R1; + SSYNC; /* SSYNC required before writing to IMEM_CONTROL. */ + .align 8; + [P4] = R5; + SSYNC; + + P4.L = LO(DMEM_CONTROL); + P4.H = HI(DMEM_CONTROL); + R5 = [P4]; + BITCLR(R5,ENDCPLB_P); + SSYNC; /* SSYNC required before writing to DMEM_CONTROL. */ + .align 8; + [P4] = R5; + SSYNC; + STI R1; + + r0 = sp; /* stack frame pt_regs pointer argument ==> r0 */ + r1 = RETX; + + SP += -12; + call _early_trap_c; + SP += 12; +ENDPROC(_early_trap) +#endif /* CONFIG_EARLY_PRINTK */ /* * Put these in the kernel data section - that should always be covered by |