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Diffstat (limited to 'arch/xtensa/kernel/traps.c')
-rw-r--r--arch/xtensa/kernel/traps.c76
1 files changed, 39 insertions, 37 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c
index 01e0111bf787..923db5c15278 100644
--- a/arch/xtensa/kernel/traps.c
+++ b/arch/xtensa/kernel/traps.c
@@ -37,6 +37,7 @@
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
+#include <asm/traps.h>
#ifdef CONFIG_KGDB
extern int gdb_enter;
@@ -193,28 +194,49 @@ void do_multihit(struct pt_regs *regs, unsigned long exccause)
}
/*
- * Level-1 interrupt.
- * We currently have no priority encoding.
+ * IRQ handler.
+ * PS.INTLEVEL is the current IRQ priority level.
*/
-unsigned long ignored_level1_interrupts;
extern void do_IRQ(int, struct pt_regs *);
-void do_interrupt (struct pt_regs *regs)
+void do_interrupt(struct pt_regs *regs)
{
- unsigned long intread = get_sr (interrupt);
- unsigned long intenable = get_sr (intenable);
- int i, mask;
-
- /* Handle all interrupts (no priorities).
- * (Clear the interrupt before processing, in case it's
- * edge-triggered or software-generated)
- */
+ static const unsigned int_level_mask[] = {
+ 0,
+ XCHAL_INTLEVEL1_MASK,
+ XCHAL_INTLEVEL2_MASK,
+ XCHAL_INTLEVEL3_MASK,
+ XCHAL_INTLEVEL4_MASK,
+ XCHAL_INTLEVEL5_MASK,
+ XCHAL_INTLEVEL6_MASK,
+ XCHAL_INTLEVEL7_MASK,
+ };
+ unsigned level = get_sr(ps) & PS_INTLEVEL_MASK;
+
+ if (WARN_ON_ONCE(level >= ARRAY_SIZE(int_level_mask)))
+ return;
- for (i=0, mask = 1; i < XCHAL_NUM_INTERRUPTS; i++, mask <<= 1) {
- if (mask & (intread & intenable)) {
- set_sr (mask, intclear);
- do_IRQ (i,regs);
+ for (;;) {
+ unsigned intread = get_sr(interrupt);
+ unsigned intenable = get_sr(intenable);
+ unsigned int_at_level = intread & intenable &
+ int_level_mask[level];
+
+ if (!int_at_level)
+ return;
+
+ /*
+ * Clear the interrupt before processing, in case it's
+ * edge-triggered or software-generated
+ */
+ while (int_at_level) {
+ unsigned i = __ffs(int_at_level);
+ unsigned mask = 1 << i;
+
+ int_at_level ^= mask;
+ set_sr(mask, intclear);
+ do_IRQ(i, regs);
}
}
}
@@ -392,26 +414,6 @@ static __always_inline unsigned long *stack_pointer(struct task_struct *task)
return sp;
}
-static inline void spill_registers(void)
-{
- unsigned int a0, ps;
-
- __asm__ __volatile__ (
- "movi a14, " __stringify(PS_EXCM_BIT | 1) "\n\t"
- "mov a12, a0\n\t"
- "rsr a13, sar\n\t"
- "xsr a14, ps\n\t"
- "movi a0, _spill_registers\n\t"
- "rsync\n\t"
- "callx0 a0\n\t"
- "mov a0, a12\n\t"
- "wsr a13, sar\n\t"
- "wsr a14, ps\n\t"
- :: "a" (&a0), "a" (&ps)
- : "a2", "a3", "a4", "a7", "a11", "a12", "a13", "a14", "a15",
- "memory");
-}
-
void show_trace(struct task_struct *task, unsigned long *sp)
{
unsigned long a0, a1, pc;
@@ -524,7 +526,7 @@ void die(const char * str, struct pt_regs * regs, long err)
if (!user_mode(regs))
show_stack(NULL, (unsigned long*)regs->areg[1]);
- add_taint(TAINT_DIE);
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
spin_unlock_irq(&die_lock);
if (in_interrupt())