1 files changed, 155 insertions, 0 deletions
diff --git a/kernel/arch/x86_64/asm/isr.s b/kernel/arch/x86_64/asm/isr.s
new file mode 100644
index 0000000..a79532d
--- /dev/null
+++ b/kernel/arch/x86_64/asm/isr.s
@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2025 Danny Holman <dholman@gymli.org>
+ *
+ * This file is part of BoxOS, a free and open-source Unix-like operating
+ * system.
+ *
+ * BoxOS is free software; you can redistribute it and/or modify under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ *
+ * BoxOS is distributed in the hope it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * BoxOS; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+.section .text
+
+.macro isr_err_stub num
+.global isr_stub_\num
+.type isr_stub_\num, @function
+isr_stub_\num:
+        cli
+        pushq $\num
+        jmp isr_frame_asm
+.endm
+.macro isr_no_err_stub num
+.global isr_stub_\num
+.type isr_stub_\num, @function
+isr_stub_\num:
+        cli
+        pushq $0
+        pushq $\num
+        jmp isr_frame_asm
+.endm
+
+.macro irq_stub num
+.global irq_stub_\num
+.type irq_stub_\num, @function
+irq_stub_\num:
+        cli
+        pushq $0
+        pushq $\num+32
+        jmp isr_frame_asm
+.endm
+
+isr_frame_asm:
+        pushq %rax
+        pushq %rbx
+        pushq %rcx
+        pushq %rdx
+        pushq %rsi
+        pushq %rdi
+        pushq %r8
+        pushq %r9
+        pushq %r10
+        pushq %r11
+        pushq %r12
+        pushq %r13
+        pushq %r14
+        pushq %r15
+
+        movq %cr0, %rax
+        pushq %rax
+        movq %cr2, %rax
+        pushq %rax
+        movq %cr3, %rax
+        pushq %rax
+        movq %cr4, %rax
+        pushq %rax
+
+        movq %rsp, %rdi
+        cld
+        call isr_dispatch
+
+        popq %rax
+        movq %rax, %cr4
+        popq %rax
+        movq %rax, %cr3
+        popq %rax
+        movq %rax, %cr2
+        popq %rax
+        movq %rax, %cr0
+
+        popq %r15
+        popq %r14
+        popq %r13
+        popq %r12
+        popq %r11
+        popq %r10
+        popq %r9
+        popq %r8
+        popq %rdi
+        popq %rsi
+        popq %rdx
+        popq %rcx
+        popq %rbx
+        popq %rax
+        addq $16, %rsp
+        iretq
+
+isr_no_err_stub         0
+isr_no_err_stub         1
+isr_no_err_stub         2
+isr_no_err_stub         3
+isr_no_err_stub         4
+isr_no_err_stub         5
+isr_no_err_stub         6
+isr_no_err_stub         7
+isr_err_stub            8
+isr_no_err_stub         9
+isr_err_stub            10
+isr_err_stub            11
+isr_err_stub            12
+isr_err_stub            13
+isr_err_stub            14
+isr_no_err_stub         15
+isr_no_err_stub         16
+isr_err_stub            17
+isr_no_err_stub         18
+isr_no_err_stub         19
+isr_no_err_stub         20
+isr_err_stub            21
+isr_no_err_stub         22
+isr_no_err_stub         23
+isr_no_err_stub         24
+isr_no_err_stub         25
+isr_no_err_stub         26
+isr_no_err_stub         27
+isr_no_err_stub         28
+isr_err_stub            29
+isr_err_stub            30
+isr_no_err_stub         31
+
+irq_stub                0
+irq_stub                1
+irq_stub                2
+irq_stub                3
+irq_stub                4
+irq_stub                5
+irq_stub                6
+irq_stub                7
+irq_stub                8
+irq_stub                9
+irq_stub                10
+irq_stub                11
+irq_stub                12
+irq_stub                13
+irq_stub                14
+irq_stub                15
+
+isr_no_err_stub         128