arch: i386: cleanup everything and reorganize

Clean up everything in the i386 arch directory. This code has been in
dire need of refactoring for a long while. All the inline assembly
functions and the data structures related to the architecture should be
placed into their own header file. Now the scheduler can access
registers and ISRs without having to deal with arch-specific code.

Signed-off-by: Danny Holman <dholman@gymli.org>

1 files changed, 129 insertions, 0 deletions

diff --git a/arch/i386/kernel/isr.s b/arch/i386/kernel/isr.s
new file mode 100644
index 0000000..55db35e
--- /dev/null
+++ b/arch/i386/kernel/isr.s
@@ -0,0 +1,129 @@
+.section .text
+
+.macro isr_err_stub num
+.global isr_stub_\num
+.type isr_stub_\num, @function
+isr_stub_\num:
+        cli
+        pushl $\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
+        pushl $0
+        pushl $\num
+        jmp isr_frame_asm
+.endm
+
+.macro irq_stub num
+.global irq_stub_\num
+.type irq_stub_\num, @function
+irq_stub_\num:
+        cli
+        pushl $0
+        pushl $\num+32
+        jmp isr_frame_asm
+.endm
+
+.global syscall_stub
+syscall_stub:
+        cli
+        pushl $0
+        pushl $0x80
+        jmp isr_frame_asm
+
+isr_frame_asm:
+        pushl %eax
+        pushl %ebx
+        pushl %ecx
+        pushl %edx
+        pushl %esi
+        pushl %edi
+
+        movl %cr0, %eax
+        pushl %eax
+        movl %cr2, %eax
+        pushl %eax
+        movl %cr3, %eax
+        pushl %eax
+        movl %cr4, %eax
+        pushl %eax
+
+        pushl %esp
+        call set_kernel_esp
+        addl $4, %esp
+
+        cld
+        call interrupt_handler
+
+        popl %eax
+        movl %eax, %cr4
+        popl %eax
+        movl %eax, %cr3
+        popl %eax
+        movl %eax, %cr2
+        popl %eax
+        movl %eax, %cr0
+
+        popl %edi
+        popl %esi
+        popl %edx
+        popl %ecx
+        popl %ebx
+        popl %eax
+        addl $8, %esp
+
+        iret
+
+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