Proper interrupt handlers

Proper interrupt handlers for timers (and new peripherals can use them
too).
Improved interrupt enabling.
Improved timer interrupts and fixed minor bugs.

include/gic.h

@@ -39,6 +39,7 @@ namespace GIC {
     };
 
     void enable(void);
+    void enableInterrupt(const uint16_t m, const TargetCPU target, const Sensitivity sensitivity);
 }
 
 #endif

include/interrupt.h

@@ -3,10 +3,10 @@
 
 #include <stdint.h>
 
-extern "C" void setVectorBAR(void);
-extern "C" address_t* getVectorBAR(void);
-
 extern "C" void fireswi(void);
 
+namespace interrupt {
+    extern void (*handler[])(const uint8_t cpuID, const uint16_t interruptID);
+}
 
 #endif

include/timer.h

@@ -43,8 +43,9 @@ namespace Timer {
 
     class Timer {
         private:
-            uint8_t n;
-            TimerModule* module;
+            uint8_t n;              /* Timer module number (0-5) */
+            uint16_t src;           /* Timer interrupt source line (54-57, 99-100) */
+            TimerModule* module;    /* Timer module MMIO config registers */
         public:
             /* Initialize class instance as timer n
              * where n is found on Allwinner datasheet */
@@ -57,6 +58,9 @@ namespace Timer {
             void stop(void);
     };
 
+    /* Interrupt handler */
+    extern void handler(const uint8_t cpuID, const uint16_t interruptID);
+
     /* Vector of system's timers */
     extern Timer timer[];
 

src/gic.cpp

@@ -27,25 +27,9 @@ namespace GIC {
         cpuInterface[1] = 0xff;
     }
 
-    void printDistributorStatus(void) {
-        for (short i = 0; i < 1024; ++i) {
-            printk("Distributor "); printk(itoa(i * 4)); printk(" : ");
-            printkl(itoa(distributor[i]));
-        }
-    }
-    void printCPUInterfaceStatus(void) {
-        for (short i = 0; i < 64; ++i) {
-            printk("CPUInterface "); printk(itoa(i * 4)); printk(" : ");
-            printkl(itoa(cpuInterface[i]));
-        }
-    }
-
     void enable(void) {
-
-        enableInterrupt(54, CPU0T, EDGE);    /* Timer0 */
-
         /* Enable distributor and CPU interfaces
-         * Do this always at the end,
+         * Call this function always at the end,
          * since writing on GIC registers is not allowed when it is enabled */
         distributor[0] = distributor[GICD_CTLR] | 0x1;
         cpuInterface[0] = cpuInterface[GICC_CTLR] | 0x1;

src/interrupt.cpp

@@ -0,0 +1,6 @@
+#include <stdint.h>
+
+namespace interrupt {
+    void (*handler[128])(const uint8_t cpuID, const uint16_t interruptID);
+}
+

src/kernel.cpp

@@ -15,12 +15,14 @@ extern "C" int main(int argc, char** argv) {
     printkl("Now firing test software interrupt...");
     fireswi();
 
-    printkl("Now enabling GIC interrupts...");
-    GIC::enable();
-
     printkl("Now enabling timer...");
-    Timer::timer[0].set(0x80, Timer::CONTINUOUS, Timer::PRESCALER_128, Timer::LS_OSC);
+    Timer::timer[0].set(0x100, Timer::CONTINUOUS, Timer::PRESCALER_128, Timer::LS_OSC);
     Timer::timer[0].start();
+    Timer::timer[5].set(0x100, Timer::CONTINUOUS, Timer::PRESCALER_16, Timer::LS_OSC);
+    Timer::timer[5].start();
+
+    printkl("Now enabling GIC...");
+    GIC::enable();
 
     printkl("Now going user...");
     go_usr();

src/timer.cpp

@@ -1,16 +1,23 @@
+#include <gic.h>
+#include <interrupt.h>
 #include <timer.h>
 #include <dbg.h>
 
 namespace Timer {
 
-    Timer timer[3] = { Timer(0), Timer(1), Timer(2) };
+    Timer timer[6] = { Timer(0), Timer(1), Timer(2), Timer(3), Timer(4), Timer(5) };
 
     Timer::Timer(uint8_t n) {
         this->n = n;
-        module = (TimerModule*)(TMR_MODULE_BASE + n);
+        if (n >= 0 && n <= 3) this->src = 54 + n;
+        if (n >= 4 && n <= 5) this->src = 99 - 4 + n;
+        module = (TimerModule*)(TMR_MODULE_BASE + n * 4);
     }
 
     void Timer::set(uint32_t interval, Mode mode, Prescaler prescaler, ClockSource source) {
+        /* attach interrupt handler */
+        interrupt::handler[src] = handler;
+
         /* zero fill control registers */
         module->TMR_CTLR_REG = 0;
         module->TMR_CUR_VALUE_REG = 0;
@@ -21,9 +28,9 @@ namespace Timer {
         /* Set timer value */
         module->TMR_INTV_VALUE_REG = interval;
 
-        /* Enable interrupt */
+        /* Enable interrupt in GIC and set interrupt handler */
+        GIC::enableInterrupt(src, GIC::CPU0T, GIC::EDGE);
         peripheral->TMR_IRQ_EN_REG = peripheral->TMR_IRQ_EN_REG | (1 << n);
-
     }
 
     void Timer::start(void) {
@@ -36,4 +43,12 @@ namespace Timer {
         module->TMR_CTLR_REG = module->TMR_CTLR_REG & 0xfffffffe;
     }
 
+    void handler(const uint8_t cpuID, const uint16_t interruptID) {
+        uint16_t n;
+        if (interruptID >= 54 && interruptID <= 57) n = interruptID - 54;
+        if (interruptID >= 99 && interruptID <= 100) n = interruptID - 99 + 4;
+
+        peripheral->TMR_IRQ_STA_REG = peripheral->TMR_IRQ_STA_REG | (1 << n);
+    }
+
 }

src/vectab.cpp

@@ -1,23 +1,28 @@
 #include <dbg.h>
+#include <interrupt.h>
 #include <stdint.h>
 
 extern "C" uint32_t c_irq_handler(uint32_t iar) {
     uint8_t cpuID = (iar >> 10) & 0x7;
     uint16_t interruptID = iar & 0x3ff;
 
+    printk("Serving IRQ #"); printkl(itoa(interruptID));
+
+    void (*handler)(const uint8_t, const uint16_t);
+
     if (cpuID == 0) {
         /* for
          *  SPI - Shared Peripheral Interrupt
          *  PPI - Private Peripheral Interrupt
         */
-        switch (interruptID) {
-            case 54:    /* timer 0 */ /* TODO: improve this ugliness */
-                uint32_t* const TMR_IRQ_STA_REG = (uint32_t* const)(0x01c20c04);
-                *TMR_IRQ_STA_REG = *TMR_IRQ_STA_REG | 0x1;
-                printk("Serving IRQ #");
-                printkl(itoa(interruptID));
+        switch (interruptID) {  /* Choose proper interrupt handler */
+            case 54: case 55: case 56: case 57: case 99: case 100:
+                handler = interrupt::handler[interruptID];
                 break;
         }
+
+        /* Call interrupt handler */
+        handler(cpuID, interruptID);
     }
     else {
         /* for