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Blackfin: optimize double fault boot checking

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This moves the double fault data used at boot time into a single struct
which can then easily be addressed with indexed loads rather than having
to explicitly load multiple addresses.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger
2011-05-29 23:12:51 -04:00
parent 072a5cff2f
commit fb1d9be596
6 changed files with 62 additions and 63 deletions
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16
arch/blackfin/kernel/setup.c
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@@ -54,8 +54,7 @@ EXPORT_SYMBOL(mtd_size);
#endif
char __initdata command_line[COMMAND_LINE_SIZE];
void __initdata *init_retx, *init_saved_retx, *init_saved_seqstat,
*init_saved_icplb_fault_addr, *init_saved_dcplb_fault_addr;
struct blackfin_initial_pda __initdata initial_pda;
/* boot memmap, for parsing "memmap=" */
#define BFIN_MEMMAP_MAX 128 /* number of entries in bfin_memmap */
@@ -957,13 +956,16 @@ void __init setup_arch(char **cmdline_p)
printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
#ifdef CONFIG_DEBUG_DOUBLEFAULT
/* We assume the crashing kernel, and the current symbol table match */
printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
(int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
printk(KERN_EMERG " While handling exception (EXCAUSE = %#x) at %pF\n",
initial_pda.seqstat_doublefault & SEQSTAT_EXCAUSE,
initial_pda.retx_doublefault);
printk(KERN_NOTICE " DCPLB_FAULT_ADDR: %pF\n",
initial_pda.dcplb_doublefault_addr);
printk(KERN_NOTICE " ICPLB_FAULT_ADDR: %pF\n",
initial_pda.icplb_doublefault_addr);
#endif
printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
init_retx);
initial_pda.retx);
} else if (_bfin_swrst & RESET_WDOG)
printk(KERN_INFO "Recovering from Watchdog event\n");
else if (_bfin_swrst & RESET_SOFTWARE)