* gic.c
* - GIC Core
*/
+#define DEBUG 1
+
#include <acess.h>
#include <modules.h>
+#include "gic.h"
+
+#define N_IRQS 1024
+
+// === IMPORTS ===
+extern void *gpIRQHandler;
+
+// === TYPES ===
+typedef void (*tIRQ_Handler)(int, void*);
// === PROTOTYPES ===
int GIC_Install(char **Arguments);
+void GIC_IRQHandler(void);
// === GLOBALS ===
MODULE_DEFINE(0, 0x100, armv7_GIC, GIC_Install, NULL, NULL);
+Uint32 *gpGIC_DistributorBase;
+Uint32 *gpGIC_InterfaceBase;
+tPAddr gGIC_DistributorAddr;
+tPAddr gGIC_InterfaceAddr;
+tIRQ_Handler gaIRQ_Handlers[N_IRQS];
+void *gaIRQ_HandlerData[N_IRQS];
// === CODE ===
int GIC_Install(char **Arguments)
{
+ // Realview PB
+ gGIC_InterfaceAddr = 0x1e000000;
+ gGIC_DistributorAddr = 0x1e001000;
+
+ // Initialise
+ gpGIC_InterfaceBase = (void*)MM_MapHWPages(gGIC_InterfaceAddr, 1);
+ gpGIC_DistributorBase = (void*)MM_MapHWPages(gGIC_DistributorAddr, 1);
+
+ gpGIC_InterfaceBase[GICC_PMR] = 0xFF;
+ gpGIC_InterfaceBase[GICC_CTLR] = 1; // Enable CPU
+ gpGIC_DistributorBase[GICD_CTLR] = 1; // Enable Distributor
+
+ gpIRQHandler = GIC_IRQHandler;
+
+ __asm__ __volatile__ ("cpsie if"); // Enable IRQs and FIQs
+
return MODULE_ERR_OK;
}
-int IRQ_AddHandler(int IRQ, void (*Handler)(int, void*), void *Ptr)
+void GIC_IRQHandler(void)
+{
+ Uint32 num = gpGIC_InterfaceBase[GICC_IAR];
+// Log_Debug("GIC", "IRQ 0x%x", num);
+ gaIRQ_Handlers[num]( num, gaIRQ_HandlerData[num] );
+ gpGIC_InterfaceBase[GICC_EOIR] = num;
+}
+
+int IRQ_AddHandler(int IRQ, tIRQ_Handler Handler, void *Ptr)
{
- Log_Warning("GIC", "TODO: Implement IRQ_AddHandler");
+ if( IRQ < 0 || IRQ >= N_IRQS-32 ) {
+ return 1;
+ }
+
+ LOG("IRQ = %i", IRQ);
+ IRQ += 32; // 32 internal IRQs
+ LOG("IRQ = %i (after adjust)", IRQ);
+ LOG("mask = 0x%x", 1 << (IRQ & (31-1)));
+ gpGIC_DistributorBase[GICD_ISENABLER0+IRQ/32] = 1 << (IRQ & (32-1));
+ ((Uint8*)&gpGIC_DistributorBase[GICD_ITARGETSR0])[IRQ] = 1;
+
+// Log_Warning("GIC", "TODO: Implement IRQ_AddHandler");
+
+ if( gaIRQ_Handlers[IRQ] )
+ return 2;
+
+ gaIRQ_Handlers[IRQ] = Handler;
+ gaIRQ_HandlerData[IRQ] = Ptr;
+
return 0;
}