* Add a model of the ETRAX interrupt controller.

* Clean up the interrupt handling a bit.
* Connect some NOR flash to the test board.


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4055 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 51 insertions, 56 deletions

diff --git a/target-cris/helper.c b/target-cris/helper.c
index 7482e08..8872138 100644
--- a/target-cris/helper.c
+++ b/target-cris/helper.c
@@ -28,6 +28,8 @@
 #include "exec-all.h"
 #include "host-utils.h"
 
+#define D(x)
+
 #if defined(CONFIG_USER_ONLY)
 
 void do_interrupt (CPUState *env)
@@ -53,71 +55,68 @@ target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
 
 #else /* !CONFIG_USER_ONLY */
 
+
+static void cris_shift_ccs(CPUState *env)
+{
+	uint32_t ccs;
+	/* Apply the ccs shift.  */
+	ccs = env->pregs[PR_CCS];
+	ccs = (ccs & 0xc0000000) | ((ccs << 12) >> 2);
+	env->pregs[PR_CCS] = ccs;
+}
+
 int cpu_cris_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
                                int mmu_idx, int is_softmmu)
 {
 	struct cris_mmu_result_t res;
 	int prot, miss;
+	int r = -1;
 	target_ulong phy;
 
+	D(printf ("%s addr=%x pc=%x\n", __func__, address, env->pc));
 	address &= TARGET_PAGE_MASK;
 	prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
 	miss = cris_mmu_translate(&res, env, address, rw, mmu_idx);
 	if (miss)
 	{
-		/* handle the miss.  */
-		phy = 0;
-		env->exception_index = EXCP_MMU_MISS;
+		env->exception_index = EXCP_MMU_FAULT;
+		env->fault_vector = res.bf_vec;
+		r = 1;
 	}
 	else
 	{
 		phy = res.phy;
+		prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
+		r = tlb_set_page(env, address, phy, prot, mmu_idx, is_softmmu);
 	}
-	return tlb_set_page(env, address, phy, prot, mmu_idx, is_softmmu);
-}
-
-
-static void cris_shift_ccs(CPUState *env)
-{
-	uint32_t ccs;
-	/* Apply the ccs shift.  */
-	ccs = env->pregs[PR_CCS];
-	ccs = (ccs & 0xc0000000) | ((ccs << 12) >> 2);
-	env->pregs[PR_CCS] = ccs;
+	D(printf("%s returns %d irqreq=%x addr=%x ismmu=%d\n", 
+			__func__, r, env->interrupt_request, 
+			address, is_softmmu));
+	return r;
 }
 
 void do_interrupt(CPUState *env)
 {
-	uint32_t ebp, isr;
-	int irqnum;
-
-	fflush(NULL);
+	int ex_vec = -1;
 
-#if 0
-	printf ("exception index=%d interrupt_req=%d\n",
-		env->exception_index,
-		env->interrupt_request);
-#endif
+	D(fprintf (stderr, "exception index=%d interrupt_req=%d\n",
+		 env->exception_index,
+		 env->interrupt_request));
 
 	switch (env->exception_index)
 	{
 		case EXCP_BREAK:
-			irqnum = env->trapnr;
-			ebp = env->pregs[PR_EBP];
-			isr = ldl_code(ebp + irqnum * 4);
+			/* These exceptions are genereated by the core itself.
+			   ERP should point to the insn following the brk.  */
+			ex_vec = env->trap_vector;
 			env->pregs[PR_ERP] = env->pc + 2;
-			env->pc = isr;
-
-			cris_shift_ccs(env);
-
 			break;
-		case EXCP_MMU_MISS:
-			irqnum = 4;
-			ebp = env->pregs[PR_EBP];
-			isr = ldl_code(ebp + irqnum * 4);
-			env->pregs[PR_ERP] = env->pc;
-			env->pc = isr;
-			cris_shift_ccs(env);
+
+		case EXCP_MMU_FAULT:
+			/* ERP is already setup by translate-all.c through
+			   re-translation of the aborted TB combined with 
+			   pc searching.  */
+			ex_vec = env->fault_vector;
 			break;
 
 		default:
@@ -125,34 +124,29 @@ void do_interrupt(CPUState *env)
 			/* Maybe the irq was acked by sw before we got a
 			   change to take it.  */
 			if (env->interrupt_request & CPU_INTERRUPT_HARD) {
-				if (!env->pending_interrupts)
+				/* Vectors below 0x30 are internal
+				   exceptions, i.e not interrupt requests
+				   from the interrupt controller.  */
+				if (env->interrupt_vector < 0x30)
 					return;
+				/* Is the core accepting interrupts?  */
 				if (!(env->pregs[PR_CCS] & I_FLAG)) {
 					return;
 				}
-
-				irqnum = 31 - clz32(env->pending_interrupts);
-				irqnum += 0x30;
-				ebp = env->pregs[PR_EBP];
-				isr = ldl_code(ebp + irqnum * 4);
+				/* The interrupt controller gives us the
+				   vector.  */
+				ex_vec = env->interrupt_vector;
+				/* Normal interrupts are taken between
+				   TB's.  env->pc is valid here.  */
 				env->pregs[PR_ERP] = env->pc;
-				env->pc = isr;
-
-				cris_shift_ccs(env);
-#if 0
-				printf ("%s ebp=%x %x isr=%x %d"
-					" ir=%x pending=%x\n",
-					__func__,
-					ebp, ebp + irqnum * 4,
-					isr, env->exception_index,
-					env->interrupt_request,
-					env->pending_interrupts);
-#endif
 			}
-
 		}
 		break;
 	}
+	env->pc = ldl_code(env->pregs[PR_EBP] + ex_vec * 4);
+	/* Apply the CRIS CCS shift.  */
+	cris_shift_ccs(env);
+	D(printf ("%s ebp=%x isr=%x vec=%x\n", __func__, ebp, isr, ex_vec));
 }
 
 target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
@@ -163,6 +157,7 @@ target_phys_addr_t cpu_get_phys_page_debug(CPUState * env, target_ulong addr)
 	miss = cris_mmu_translate(&res, env, addr, 0, 0);
 	if (!miss)
 		phy = res.phy;
+	D(fprintf(stderr, "%s %x -> %x\n", __func__, addr, phy));
 	return phy;
 }
 #endif