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//! Interrupt Service Routine Stubs
//! Assembly entry points for exceptions and hardware interrupts
const std = @import("std");
// External handlers (implemented in Zig)
extern fn exception_handler(ctx: u64) void;
extern fn timer_handler() void;
extern fn keyboard_handler() void;
// ISR function type for IDT registration
pub const ISRHandler = *const fn () callconv(.c) void;
/// Get ISR handler address for exception vector
pub fn get_exception_handler(vector: u8) ISRHandler {
return switch (vector) {
0 => &isr0,
1 => &isr1,
2 => &isr2,
3 => &isr3,
4 => &isr4,
5 => &isr5,
6 => &isr6,
7 => &isr7,
8 => &isr8,
9 => &isr9,
10 => &isr10,
11 => &isr11,
12 => &isr12,
13 => &isr13,
14 => &isr14,
15 => &isr15,
16 => &isr16,
17 => &isr17,
18 => &isr18,
19 => &isr19,
20 => &isr20,
21 => &isr21,
22 => &isr22,
23 => &isr23,
24 => &isr24,
25 => &isr25,
26 => &isr26,
27 => &isr27,
28 => &isr28,
29 => &isr29,
30 => &isr30,
31 => &isr31,
else => &isr0,
};
}
/// Get IRQ handler address
pub fn get_irq_handler(irq: u8) ISRHandler {
return switch (irq) {
0 => &irq0_handler,
1 => &irq1_handler,
else => &irq0_handler,
};
}
// Exception ISR stubs (0-31)
comptime {
// Generate ISR stubs for all 32 exceptions
var i: u32 = 0;
while (i < 32) : (i += 1) {
if (i == 8 or (i >= 10 and i <= 14) or i == 17 or i == 21) {
// Exceptions with error code pushed by CPU
asm (std.fmt.comptimePrint(
\\.global isr{d}
\\isr{d}:
\\ push ${d}
\\ jmp common_exception_handler
, .{ i, i, i }));
} else {
// Exceptions without error code - push dummy 0
asm (std.fmt.comptimePrint(
\\.global isr{d}
\\isr{d}:
\\ push $0
\\ push ${d}
\\ jmp common_exception_handler
, .{ i, i, i }));
}
}
// Common exception handler - saves all registers and calls Zig handler
asm (
\\common_exception_handler:
\\ push %rax
\\ push %rbx
\\ push %rcx
\\ push %rdx
\\ push %rsi
\\ push %rdi
\\ push %rbp
\\ push %r8
\\ push %r9
\\ push %r10
\\ push %r11
\\ push %r12
\\ push %r13
\\ push %r14
\\ push %r15
\\ mov %rsp, %rdi
\\ call exception_handler
\\ pop %r15
\\ pop %r14
\\ pop %r13
\\ pop %r12
\\ pop %r11
\\ pop %r10
\\ pop %r9
\\ pop %r8
\\ pop %rbp
\\ pop %rdi
\\ pop %rsi
\\ pop %rdx
\\ pop %rcx
\\ pop %rbx
\\ pop %rax
\\ add $16, %rsp
\\ iretq
);
// IRQ handlers
asm (
\\.global irq0_handler
\\irq0_handler:
\\ push %rax
\\ push %rbx
\\ push %rcx
\\ push %rdx
\\ push %rsi
\\ push %rdi
\\ push %rbp
\\ push %r8
\\ push %r9
\\ push %r10
\\ push %r11
\\ push %r12
\\ push %r13
\\ push %r14
\\ push %r15
\\ call timer_handler
\\ pop %r15
\\ pop %r14
\\ pop %r13
\\ pop %r12
\\ pop %r11
\\ pop %r10
\\ pop %r9
\\ pop %r8
\\ pop %rbp
\\ pop %rdi
\\ pop %rsi
\\ pop %rdx
\\ pop %rcx
\\ pop %rbx
\\ pop %rax
\\ iretq
\\
\\.global irq1_handler
\\irq1_handler:
\\ push %rax
\\ push %rbx
\\ push %rcx
\\ push %rdx
\\ push %rsi
\\ push %rdi
\\ push %rbp
\\ push %r8
\\ push %r9
\\ push %r10
\\ push %r11
\\ push %r12
\\ push %r13
\\ push %r14
\\ push %r15
\\ call keyboard_handler
\\ pop %r15
\\ pop %r14
\\ pop %r13
\\ pop %r12
\\ pop %r11
\\ pop %r10
\\ pop %r9
\\ pop %r8
\\ pop %rbp
\\ pop %rdi
\\ pop %rsi
\\ pop %rdx
\\ pop %rcx
\\ pop %rbx
\\ pop %rax
\\ iretq
);
}
// Extern declarations for ISR addresses
extern fn isr0() callconv(.c) void;
extern fn isr1() callconv(.c) void;
extern fn isr2() callconv(.c) void;
extern fn isr3() callconv(.c) void;
extern fn isr4() callconv(.c) void;
extern fn isr5() callconv(.c) void;
extern fn isr6() callconv(.c) void;
extern fn isr7() callconv(.c) void;
extern fn isr8() callconv(.c) void;
extern fn isr9() callconv(.c) void;
extern fn isr10() callconv(.c) void;
extern fn isr11() callconv(.c) void;
extern fn isr12() callconv(.c) void;
extern fn isr13() callconv(.c) void;
extern fn isr14() callconv(.c) void;
extern fn isr15() callconv(.c) void;
extern fn isr16() callconv(.c) void;
extern fn isr17() callconv(.c) void;
extern fn isr18() callconv(.c) void;
extern fn isr19() callconv(.c) void;
extern fn isr20() callconv(.c) void;
extern fn isr21() callconv(.c) void;
extern fn isr22() callconv(.c) void;
extern fn isr23() callconv(.c) void;
extern fn isr24() callconv(.c) void;
extern fn isr25() callconv(.c) void;
extern fn isr26() callconv(.c) void;
extern fn isr27() callconv(.c) void;
extern fn isr28() callconv(.c) void;
extern fn isr29() callconv(.c) void;
extern fn isr30() callconv(.c) void;
extern fn isr31() callconv(.c) void;
extern fn irq0_handler() callconv(.c) void;
extern fn irq1_handler() callconv(.c) void;
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