did some restructuring, got multitasking almost working

2026-06-26 20:05:01 -05:00
parent 57d7d34c6d
commit 43bc0df81a
35 changed files with 481 additions and 307 deletions
--- a/kernel/common.S
+++ b/kernel/common.S
@@ -0,0 +1,123 @@
+.code32 
+.section .text
+
+.global disable_interrupts
+disable_interrupts:
+    cli 
+    ret
+
+.global enable_interrupts
+enable_interrupts:
+    sti 
+    ret
+
+.global io_wait 
+io_wait:
+    outb %al, $0x80
+    ret
+
+.global liftoff
+liftoff:
+    cli
+
+    mov 4(%esp), %ecx
+    mov 8(%esp), %ebx
+
+    mov $0x23, %ax
+    mov %ax, %ds
+    mov %ax, %es
+    mov %ax, %fs
+    mov %ax, %gs
+
+    push $0x23           
+    push %ebx
+    push $0x202
+    push $0x1B
+    push %ecx
+
+    xor %eax, %eax
+    xor %edx, %edx
+    
+    iret
+
+.global outb
+outb: 
+    push %ebp
+    mov %esp, %ebp
+
+    # 8(%ebp) port
+    # 12(%ebp) data
+    mov 8(%ebp), %edx 
+    mov 12(%ebp), %eax
+    outb %al, %dx
+
+    leave
+    ret
+
+.global inb
+inb:
+    push %ebp
+    mov %esp, %ebp
+
+    # 8(%ebp) port
+    mov 8(%ebp), %edx 
+    xor %eax, %eax
+    inb %dx, %al
+
+    leave 
+    ret
+
+.global insw 
+insw:
+    push %ebp
+    mov %esp, %ebp 
+
+    push %edi
+    push %ecx 
+    push %edx
+
+    # 8(%ebp) addr
+    # 12(%ebp) buf
+    # 16(%ebp) sz
+    mov 8(%ebp), %edx 
+    mov 12(%ebp), %edi
+    mov 16(%ebp), %ecx
+
+    cld
+    rep insw
+
+    pop %edx
+    pop %ecx
+    pop %edi
+    leave
+    ret
+
+.global outsw
+outsw:
+    push %ebp
+    mov %esp, %ebp 
+
+    push %esi
+    push %ecx 
+    push %edx
+
+    # 8(%ebp) address
+    # 12(%ebp) buf
+    # 16(%ebp) sz
+    mov 8(%ebp), %edx 
+    mov 12(%ebp), %esi
+    mov 16(%ebp), %ecx
+
+    cld
+    rep outsw
+
+    pop %edx
+    pop %ecx
+    pop %esi
+    leave
+    ret
+
+.global fetch_cr3
+fetch_cr3: 
+    mov %cr3, %eax 
+    ret