cris build fixes: corrected and improved NMI and IRQ handling

Corrects compile errors and the following:

- Remove oldset parameter from do_signal and do_notify_resume.

- Modified to fit new consolidated IRQ handling code.

- Reverse check order between external nmi and watchdog nmi to avoid false
  watchdog oops in case of a glitch on the nmi pin.

- Return from an pin-generated NMI the same way as for other interrupts.

- Moved blocking of ethernet rx/tx irq from ethernet interrupt handler to
  low-level asm interrupt handlers.  Fixed in the multiple interrupt
  handler also.

- Add space for thread local storage in thread_info struct.

- Add NO_DMA to Kconfig, and include arch specific Kconfig using arch
  independent path. Include subsystem Kconfigs for pcmcia, usb, i2c,
  rtc and pci.

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Mikael Starvik <starvik@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 77 insertions, 23 deletions

diff --git a/arch/cris/arch-v10/kernel/entry.S b/arch/cris/arch-v10/kernel/entry.S
index bc9bed97f22..ec62c951fa3 100644
--- a/arch/cris/arch-v10/kernel/entry.S
+++ b/arch/cris/arch-v10/kernel/entry.S
@@ -500,9 +500,8 @@ _work_notifysig:
 	;; deal with pending signals and notify-resume requests
 
 	move.d	$r9, $r10	; do_notify_resume syscall/irq param
-	moveq	0, $r11		; oldset param - 0 in this case
-	move.d	$sp, $r12	; the regs param
-	move.d  $r1, $r13	; the thread_info_flags parameter
+	move.d	$sp, $r11	; the regs param
+	move.d  $r1, $r12	; the thread_info_flags parameter
 	jsr	do_notify_resume
 	
 	ba _Rexit
@@ -678,13 +677,19 @@ IRQ1_interrupt:
 	push	$r10		; push orig_r10
 	clear.d [$sp=$sp-4]	; frametype == 0, normal frame
 
+	;; If there is a glitch on the NMI pin shorter than ~100ns
+	;; (i.e. non-active by the time we get here) then the nmi_pin bit
+	;; in R_IRQ_MASK0_RD will already be cleared.  The watchdog_nmi bit
+	;; is cleared by us however (when feeding the watchdog), which is why
+	;; we use that bit to determine what brought us here.
+
 	move.d	[R_IRQ_MASK0_RD], $r1 ; External NMI or watchdog?
-	and.d   0x80000000, $r1
-	beq	wdog
+	and.d   (1<<30), $r1
+	bne	wdog
 	move.d  $sp, $r10
 	jsr	handle_nmi
 	setf m			; Enable NMI again
-	retb			; Return from NMI
+	ba	_Rexit		; Return the standard way
 	nop
 wdog:
 #if defined(CONFIG_ETRAX_WATCHDOG) && !defined(CONFIG_SVINTO_SIM)
@@ -775,22 +780,9 @@ multiple_interrupt:
 	push	$r10		; push orig_r10
 	clear.d [$sp=$sp-4]	; frametype == 0, normal frame
 	
-	moveq	2, $r2		; first bit we care about is the timer0 irq
-	move.d	[R_VECT_MASK_RD], $r0; read the irq bits that triggered the multiple irq
-	move.d	$r0, [R_VECT_MASK_CLR] ; Block all active IRQs
-1:	
-	btst	$r2, $r0	; check for the irq given by bit r2
-	bpl	2f
-	move.d  $r2, $r10	; First argument to do_IRQ
-	move.d  $sp, $r11	; second argument to do_IRQ
-	jsr	do_IRQ
-2:
-	addq	1, $r2		; next vector bit
-	cmp.b	32, $r2
-	bne	1b	; process all irq's up to and including number 31
-	moveq	0, $r9  ; make ret_from_intr realise we came from an ir
+	move.d  $sp, $r10
+	jsr	do_multiple_IRQ
 	
-	move.d	$r0, [R_VECT_MASK_SET] ;  Unblock all the IRQs
 	jump    ret_from_intr
 
 do_sigtrap:
@@ -837,6 +829,13 @@ _ugdb_handle_breakpoint:
 	ba	do_sigtrap		; SIGTRAP the offending process. 
 	pop	$dccr			; Restore dccr in delay slot.
 	
+	.global kernel_execve
+kernel_execve:
+	move.d __NR_execve, $r9
+	break 13
+	ret
+	nop
+
 	.data
 
 hw_bp_trigs:
diff --git a/arch/cris/arch-v10/kernel/irq.c b/arch/cris/arch-v10/kernel/irq.c
index 845c95f6e87..e06ab0050d3 100644
--- a/arch/cris/arch-v10/kernel/irq.c
+++ b/arch/cris/arch-v10/kernel/irq.c
@@ -12,10 +12,16 @@
  */
 
 #include <asm/irq.h>
+#include <asm/current.h>
 #include <linux/irq.h>
+#include <linux/interrupt.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 
+/* From kgdb.c. */
+extern void kgdb_init(void);
+extern void breakpoint(void);
+
 #define mask_irq(irq_nr) (*R_VECT_MASK_CLR = 1 << (irq_nr));
 #define unmask_irq(irq_nr) (*R_VECT_MASK_SET = 1 << (irq_nr));
 
@@ -75,8 +81,8 @@ BUILD_IRQ(12, 0x1000)
 BUILD_IRQ(13, 0x2000)
 void mmu_bus_fault(void);      /* IRQ 14 is the bus fault interrupt */
 void multiple_interrupt(void); /* IRQ 15 is the multiple IRQ interrupt */
-BUILD_IRQ(16, 0x10000)
-BUILD_IRQ(17, 0x20000)
+BUILD_IRQ(16, 0x10000 | 0x20000)  /* ethernet tx interrupt needs to block rx */
+BUILD_IRQ(17, 0x20000 | 0x10000)  /* ...and vice versa */
 BUILD_IRQ(18, 0x40000)
 BUILD_IRQ(19, 0x80000)
 BUILD_IRQ(20, 0x100000)
@@ -147,6 +153,55 @@ void system_call(void);  /* from entry.S */
 void do_sigtrap(void); /* from entry.S */
 void gdb_handle_breakpoint(void); /* from entry.S */
 
+extern void do_IRQ(int irq, struct pt_regs * regs);
+
+/* Handle multiple IRQs */
+void do_multiple_IRQ(struct pt_regs* regs)
+{
+	int bit;
+	unsigned masked;
+	unsigned mask;
+	unsigned ethmask = 0;
+
+	/* Get interrupts to mask and handle */
+	mask = masked = *R_VECT_MASK_RD;
+
+	/* Never mask timer IRQ */
+	mask &= ~(IO_MASK(R_VECT_MASK_RD, timer0));
+
+	/*
+	 * If either ethernet interrupt (rx or tx) is active then block
+	 * the other one too. Unblock afterwards also.
+	 */
+	if (mask &
+	    (IO_STATE(R_VECT_MASK_RD, dma0, active) |
+	     IO_STATE(R_VECT_MASK_RD, dma1, active))) {
+		ethmask = (IO_MASK(R_VECT_MASK_RD, dma0) |
+			   IO_MASK(R_VECT_MASK_RD, dma1));
+	}
+
+	/* Block them */
+	*R_VECT_MASK_CLR = (mask | ethmask);
+
+	/* An extra irq_enter here to prevent softIRQs to run after
+	 * each do_IRQ. This will decrease the interrupt latency.
+	 */
+	irq_enter();
+
+	/* Handle all IRQs */
+	for (bit = 2; bit < 32; bit++) {
+		if (masked & (1 << bit)) {
+			do_IRQ(bit, regs);
+		}
+	}
+
+	/* This irq_exit() will trigger the soft IRQs. */
+	irq_exit();
+
+	/* Unblock the IRQs again */
+	*R_VECT_MASK_SET = (masked | ethmask);
+}
+
 /* init_IRQ() is called by start_kernel and is responsible for fixing IRQ masks and
    setting the irq vector table.
 */