Handle hardware interrupts

arch/Makefile

@@ -6,8 +6,10 @@ CC = $(CCPREFIX)gcc
 OBJS = boot.s.o main.c.o
 OBJS += logger.c.o console.c.o
 OBJS += multiboot.c.o
+
 OBJS += protected.c.o protected.asm.cpp.o
 OBJS += exception.c.o exception.asm.cpp.o
+OBJS += hwint.c.o     hwint.asm.cpp.o
 
 all: kernel
 

arch/hwint.asm

@@ -0,0 +1,54 @@
+#include "config.h"
+
+[EXTERN hwint_handler]
+
+%macro HWINT 2
+[GLOBAL hwint_%1]
+hwint_%1:
+    cli
+    push byte 0
+    push byte %2
+    jmp hwint_common_stub
+%endmacro
+
+HWINT 0,  32
+HWINT 1,  33
+HWINT 2,  34
+HWINT 3,  35
+HWINT 4,  36
+HWINT 5,  37
+HWINT 6,  38
+HWINT 7,  39
+HWINT 8,  40
+HWINT 9,  41
+HWINT 10, 42
+HWINT 11, 43
+HWINT 12, 44
+HWINT 13, 45
+HWINT 14, 46
+HWINT 15, 47
+
+hwint_common_stub:
+   pusha ; Pushes edi,esi,ebp,esp,ebx,edx,ecx,eax
+
+   mov ax, ds ; Lower 16-bits of eax = ds.
+   push eax ; save the data segment descriptor
+
+   mov ax, GDT_KERNEL_DS_SELECTOR
+   mov ds, ax
+   mov es, ax
+   mov fs, ax
+   mov gs, ax
+
+   call hwint_handler
+
+   pop eax ; reload the original data segment descriptor
+   mov ds, ax
+   mov es, ax
+   mov fs, ax
+   mov gs, ax
+
+   popa                     ; Pops edi,esi,ebp...
+   add esp, 8 ; Cleans up the pushed error code and pushed ISR number
+   sti
+   iret ; pops 5 things at once: CS, EIP, EFLAGS, SS, and ESP

arch/hwint.c

@@ -0,0 +1,32 @@
+#include "logger.h"
+
+struct IsrRegisters {
+    unsigned int ds;                                     // Data segment selector
+    unsigned int edi, esi, ebp, esp, ebx, edx, ecx, eax; // Pushed by pusha.
+    unsigned int int_no, err_code;                       // Interrupt number and error code (if applicable)
+    unsigned int eip, cs, eflags, useresp, ss;           // Pushed by the processor automatically.
+};
+
+static const char *const messages[] = {
+    "Unhandled hwint: 0",
+    "Unhandled hwint: 1",
+    "Unhandled hwint: 2",
+    "Unhandled hwint: 3",
+    "Unhandled hwint: 4",
+    "Unhandled hwint: 5",
+    "Unhandled hwint: 6",
+    "Unhandled hwint: 7",
+    "Unhandled hwint: 8",
+    "Unhandled hwint: 9",
+    "Unhandled hwint: 10",
+    "Unhandled hwint: 11",
+    "Unhandled hwint: 12",
+    "Unhandled hwint: 13",
+    "Unhandled hwint: 14",
+    "Unhandled hwint: 15",
+};
+
+void hwint_handler(struct IsrRegisters regs)
+{
+    logger_warn(messages[regs.int_no - 32]);
+}

arch/hwint.h

@@ -0,0 +1,21 @@
+#ifndef KERNELMQ_INCLUDED_HWINT
+#define KERNELMQ_INCLUDED_HWINT 1
+
+void hwint_0();
+void hwint_1();
+void hwint_2();
+void hwint_3();
+void hwint_4();
+void hwint_5();
+void hwint_6();
+void hwint_7();
+void hwint_8();
+void hwint_9();
+void hwint_10();
+void hwint_11();
+void hwint_12();
+void hwint_13();
+void hwint_14();
+void hwint_15();
+
+#endif

arch/main.c

@@ -13,7 +13,7 @@ void main(struct KernelMQ_Multiboot_Info multiboot_info)
     protected_initialize();
 
     asm volatile ("int $0x3");
-    asm volatile ("int $0x4");
+    asm volatile ("int $0x24");
 
     logger_warn("Nothing to do.");
     logger_fail("Halt.");

arch/protected.c

@@ -3,6 +3,7 @@
 #include "config.h"
 #include "logger.h"
 #include "exception.h"
+#include "hwint.h"
 
 struct GdtPointer {
     unsigned short limit;
@@ -97,6 +98,23 @@ void protected_initialize()
     idt_set_gate(30, (unsigned int)exception_30, 0x08, 0x8E);
     idt_set_gate(31, (unsigned int)exception_31, 0x08, 0x8E);
 
+    idt_set_gate(32, (unsigned int)hwint_0,  0x08, 0x8E);
+    idt_set_gate(33, (unsigned int)hwint_1,  0x08, 0x8E);
+    idt_set_gate(34, (unsigned int)hwint_2,  0x08, 0x8E);
+    idt_set_gate(35, (unsigned int)hwint_3,  0x08, 0x8E);
+    idt_set_gate(36, (unsigned int)hwint_4,  0x08, 0x8E);
+    idt_set_gate(37, (unsigned int)hwint_5,  0x08, 0x8E);
+    idt_set_gate(38, (unsigned int)hwint_6,  0x08, 0x8E);
+    idt_set_gate(39, (unsigned int)hwint_7,  0x08, 0x8E);
+    idt_set_gate(40, (unsigned int)hwint_8,  0x08, 0x8E);
+    idt_set_gate(41, (unsigned int)hwint_9,  0x08, 0x8E);
+    idt_set_gate(42, (unsigned int)hwint_10, 0x08, 0x8E);
+    idt_set_gate(43, (unsigned int)hwint_11, 0x08, 0x8E);
+    idt_set_gate(44, (unsigned int)hwint_12, 0x08, 0x8E);
+    idt_set_gate(45, (unsigned int)hwint_13, 0x08, 0x8E);
+    idt_set_gate(46, (unsigned int)hwint_14, 0x08, 0x8E);
+    idt_set_gate(47, (unsigned int)hwint_15, 0x08, 0x8E);
+
     logger_info("Load GDT.");
 
     gdt_pointer.limit = sizeof(struct GdtEntry) * GDT_SIZE - 1;