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authorRobin Getz <robin.getz@analog.com>2007-10-09 17:28:36 +0800
committerBryan Wu <bryan.wu@analog.com>2007-10-09 17:28:36 +0800
commitce3afa1c043ab3d4125671441a57353d80f5f6f7 (patch)
treea6d2d85c7380eab7e28a456cef0af2a271f1c32d /arch/blackfin/kernel
parentBlackfin arch: fix endless loop bug when a double fault happens (diff)
downloadlinux-dev-ce3afa1c043ab3d4125671441a57353d80f5f6f7.tar.xz
linux-dev-ce3afa1c043ab3d4125671441a57353d80f5f6f7.zip
Blackfin arch: Enable earlyprintk earlier - so any error after our interrupt tables are set up will print out
Also ensure that the traps_c code doesn't cause a double fault, by sending a signal to a faulting kernel before the memory subsystem is fully initialized, by printing out the error message before sending the signal. Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Diffstat (limited to 'arch/blackfin/kernel')
-rw-r--r--arch/blackfin/kernel/setup.c38
-rw-r--r--arch/blackfin/kernel/traps.c8
2 files changed, 25 insertions, 21 deletions
diff --git a/arch/blackfin/kernel/setup.c b/arch/blackfin/kernel/setup.c
index abf34a8dd070..8dcd76e87ed5 100644
--- a/arch/blackfin/kernel/setup.c
+++ b/arch/blackfin/kernel/setup.c
@@ -44,6 +44,7 @@
#include <asm/blackfin.h>
#include <asm/cplbinit.h>
#include <asm/fixed_code.h>
+#include <asm/early_printk.h>
u16 _bfin_swrst;
@@ -157,8 +158,10 @@ static __init void parse_cmdline_early(char *cmdline_p)
1;
}
}
+ } else if (!memcmp(to, "earlyprintk=", 12)) {
+ to += 12;
+ setup_early_printk(to);
}
-
}
c = *(to++);
if (!c)
@@ -177,6 +180,23 @@ void __init setup_arch(char **cmdline_p)
#ifdef CONFIG_DUMMY_CONSOLE
conswitchp = &dummy_con;
#endif
+
+#if defined(CONFIG_CMDLINE_BOOL)
+ strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
+ command_line[sizeof(command_line) - 1] = 0;
+#endif
+
+ /* Keep a copy of command line */
+ *cmdline_p = &command_line[0];
+ memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
+ boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
+
+ /* setup memory defaults from the user config */
+ physical_mem_end = 0;
+ _ramend = CONFIG_MEM_SIZE * 1024 * 1024;
+
+ parse_cmdline_early(&command_line[0]);
+
cclk = get_cclk();
sclk = get_sclk();
@@ -210,22 +230,6 @@ void __init setup_arch(char **cmdline_p)
flash_probe();
#endif
-#if defined(CONFIG_CMDLINE_BOOL)
- strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
- command_line[sizeof(command_line) - 1] = 0;
-#endif
-
- /* Keep a copy of command line */
- *cmdline_p = &command_line[0];
- memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
- boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
-
- /* setup memory defaults from the user config */
- physical_mem_end = 0;
- _ramend = CONFIG_MEM_SIZE * 1024 * 1024;
-
- parse_cmdline_early(&command_line[0]);
-
if (physical_mem_end == 0)
physical_mem_end = _ramend;
diff --git a/arch/blackfin/kernel/traps.c b/arch/blackfin/kernel/traps.c
index ba68eb2ec929..8823e9ade584 100644
--- a/arch/blackfin/kernel/traps.c
+++ b/arch/blackfin/kernel/traps.c
@@ -402,10 +402,6 @@ asmlinkage void trap_c(struct pt_regs *fp)
break;
}
- info.si_signo = sig;
- info.si_errno = 0;
- info.si_addr = (void *)fp->pc;
- force_sig_info(sig, &info, current);
if (sig != 0 && sig != SIGTRAP) {
unsigned long stack;
dump_bfin_regs(fp, (void *)fp->retx);
@@ -414,6 +410,10 @@ asmlinkage void trap_c(struct pt_regs *fp)
if (current->mm == NULL)
panic("Kernel exception");
}
+ info.si_signo = sig;
+ info.si_errno = 0;
+ info.si_addr = (void *)fp->pc;
+ force_sig_info(sig, &info, current);
/* if the address that we are about to return to is not valid, set it
* to a valid address, if we have a current application or panic