hw/sparc*: Move cpu_check_irqs() to target/sparc/

Since cpu_check_irqs() doesn't reference to anything outside
of CPUSPARCState, it better belongs to the architectural code
in target/, rather than the hardware specific code in hw/.

Note: while we moved the trace events, we don't rename them.

Remark: this allows us to build the leon3 machine stand alone,
fixing this link failure (because cpu_check_irqs is defined in
hw/sparc/sun4m.c which is only built when CONFIG_SUN4M is selected):

  /usr/bin/ld: target_sparc_win_helper.c.o: in function `cpu_put_psr':
  target/sparc/win_helper.c:91: undefined reference to `cpu_check_irqs'

Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20210428141655.387430-5-f4bug@amsat.org>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

3 files changed, 107 insertions, 0 deletions

diff --git a/target/sparc/int32_helper.c b/target/sparc/int32_helper.c
index d008dbd..82e8418 100644
--- a/target/sparc/int32_helper.c
+++ b/target/sparc/int32_helper.c
@@ -18,6 +18,7 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/main-loop.h"
 #include "cpu.h"
 #include "trace.h"
 #include "exec/log.h"
@@ -64,6 +65,38 @@ static const char *excp_name_str(int32_t exception_index)
     return excp_names[exception_index];
 }
 
+void cpu_check_irqs(CPUSPARCState *env)
+{
+    CPUState *cs;
+
+    /* We should be holding the BQL before we mess with IRQs */
+    g_assert(qemu_mutex_iothread_locked());
+
+    if (env->pil_in && (env->interrupt_index == 0 ||
+                        (env->interrupt_index & ~15) == TT_EXTINT)) {
+        unsigned int i;
+
+        for (i = 15; i > 0; i--) {
+            if (env->pil_in & (1 << i)) {
+                int old_interrupt = env->interrupt_index;
+
+                env->interrupt_index = TT_EXTINT | i;
+                if (old_interrupt != env->interrupt_index) {
+                    cs = env_cpu(env);
+                    trace_sun4m_cpu_interrupt(i);
+                    cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+                }
+                break;
+            }
+        }
+    } else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
+        cs = env_cpu(env);
+        trace_sun4m_cpu_reset_interrupt(env->interrupt_index & 15);
+        env->interrupt_index = 0;
+        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+    }
+}
+
 void sparc_cpu_do_interrupt(CPUState *cs)
 {
     SPARCCPU *cpu = SPARC_CPU(cs);
diff --git a/target/sparc/int64_helper.c b/target/sparc/int64_helper.c
index 7fb8ab2..793e57c 100644
--- a/target/sparc/int64_helper.c
+++ b/target/sparc/int64_helper.c
@@ -62,6 +62,72 @@ static const char * const excp_names[0x80] = {
 };
 #endif
 
+void cpu_check_irqs(CPUSPARCState *env)
+{
+    CPUState *cs;
+    uint32_t pil = env->pil_in |
+                  (env->softint & ~(SOFTINT_TIMER | SOFTINT_STIMER));
+
+    /* We should be holding the BQL before we mess with IRQs */
+    g_assert(qemu_mutex_iothread_locked());
+
+    /* TT_IVEC has a higher priority (16) than TT_EXTINT (31..17) */
+    if (env->ivec_status & 0x20) {
+        return;
+    }
+    cs = env_cpu(env);
+    /*
+     * check if TM or SM in SOFTINT are set
+     * setting these also causes interrupt 14
+     */
+    if (env->softint & (SOFTINT_TIMER | SOFTINT_STIMER)) {
+        pil |= 1 << 14;
+    }
+
+    /*
+     * The bit corresponding to psrpil is (1<< psrpil),
+     * the next bit is (2 << psrpil).
+     */
+    if (pil < (2 << env->psrpil)) {
+        if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
+            trace_sparc64_cpu_check_irqs_reset_irq(env->interrupt_index);
+            env->interrupt_index = 0;
+            cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+        }
+        return;
+    }
+
+    if (cpu_interrupts_enabled(env)) {
+
+        unsigned int i;
+
+        for (i = 15; i > env->psrpil; i--) {
+            if (pil & (1 << i)) {
+                int old_interrupt = env->interrupt_index;
+                int new_interrupt = TT_EXTINT | i;
+
+                if (unlikely(env->tl > 0 && cpu_tsptr(env)->tt > new_interrupt
+                  && ((cpu_tsptr(env)->tt & 0x1f0) == TT_EXTINT))) {
+                    trace_sparc64_cpu_check_irqs_noset_irq(env->tl,
+                                                      cpu_tsptr(env)->tt,
+                                                      new_interrupt);
+                } else if (old_interrupt != new_interrupt) {
+                    env->interrupt_index = new_interrupt;
+                    trace_sparc64_cpu_check_irqs_set_irq(i, old_interrupt,
+                                                         new_interrupt);
+                    cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+                }
+                break;
+            }
+        }
+    } else if (cs->interrupt_request & CPU_INTERRUPT_HARD) {
+        trace_sparc64_cpu_check_irqs_disabled(pil, env->pil_in, env->softint,
+                                              env->interrupt_index);
+        env->interrupt_index = 0;
+        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+    }
+}
+
 void sparc_cpu_do_interrupt(CPUState *cs)
 {
     SPARCCPU *cpu = SPARC_CPU(cs);
diff --git a/target/sparc/trace-events b/target/sparc/trace-events
index e925ddd..75e7093 100644
--- a/target/sparc/trace-events
+++ b/target/sparc/trace-events
@@ -10,10 +10,18 @@ mmu_helper_get_phys_addr_code(uint32_t tl, int mmu_idx, uint64_t prim_context, u
 mmu_helper_get_phys_addr_data(uint32_t tl, int mmu_idx, uint64_t prim_context, uint64_t sec_context, uint64_t address) "tl=%d mmu_idx=%d primary context=0x%"PRIx64" secondary context=0x%"PRIx64" address=0x%"PRIx64
 mmu_helper_mmu_fault(uint64_t address, uint64_t paddr, int mmu_idx, uint32_t tl, uint64_t prim_context, uint64_t sec_context) "Translate at 0x%"PRIx64" -> 0x%"PRIx64", mmu_idx=%d tl=%d primary context=0x%"PRIx64" secondary context=0x%"PRIx64
 
+# int32_helper.c
+sun4m_cpu_interrupt(unsigned int level) "Set CPU IRQ %d"
+sun4m_cpu_reset_interrupt(unsigned int level) "Reset CPU IRQ %d"
+
 # int64_helper.c
 int_helper_set_softint(uint32_t softint) "new 0x%08x"
 int_helper_clear_softint(uint32_t softint) "new 0x%08x"
 int_helper_write_softint(uint32_t softint) "new 0x%08x"
+sparc64_cpu_check_irqs_reset_irq(int intno) "Reset CPU IRQ (current interrupt 0x%x)"
+sparc64_cpu_check_irqs_noset_irq(uint32_t tl, uint32_t tt, int intno) "Not setting CPU IRQ: TL=%d current 0x%x >= pending 0x%x"
+sparc64_cpu_check_irqs_set_irq(unsigned int i, int old, int new) "Set CPU IRQ %d old=0x%x new=0x%x"
+sparc64_cpu_check_irqs_disabled(uint32_t pil, uint32_t pil_in, uint32_t softint, int intno) "Interrupts disabled, pil=0x%08x pil_in=0x%08x softint=0x%08x current interrupt 0x%x"
 
 # win_helper.c
 win_helper_gregset_error(uint32_t pstate) "ERROR in get_gregset: active pstate bits=0x%x"