root/macros.s

.macro KWRITE_DOUBLE number, row, col
    push %rax
    push %rbx
    push %rcx
    push %rdx
    mov \number, %rdx
    mov $1, %al
    mov $0, %ebx
    mov \row, %bh
    mov \col, %bl
    call Pd
    pop %rdx
    pop %rcx
    pop %rbx
    pop %rax
.endm

.macro KWRITE_STRING str, row, col
    push %rax
    push %rbx
    push %rdx
    mov \str, %rdx
    mov $0, %ebx
    mov \row, %bh
    mov \col, %bl
    call Ps
    pop %rdx
    pop %rbx
    pop %rax
.endm

.macro PUSH_ALL
    push %rax
   push %rbx
   push %rcx
   push %rdx
   push %rsi
   push %rdi
   push %rbp
.endm

.macro POP_ALL
    pop  %rbp
   pop  %rdi
   pop  %rsi
   pop  %rdx
   pop  %rcx
   pop  %rbx
   pop  %rax
.endm

.macro SWITCH_TASKS
    int $20
.endm

.macro SWITCH_TASKS_R15
    int $22
.endm

.macro SEG_DESCRIP name,base,g,segsize,longmode,limit,p,dpl,dt,type
    \name = . - mygdt
    .word   \limit & 0xffff
    .word   \base & 0xffff
    .byte   (\base & 0xff0000) >> 16
    .byte   (\p << 3 + \dpl << 1 + \dt) << 4 + \type
    .byte   (\g << 3 + \segsize << 2 + \longmode << 1) << 4 + ((\limit & 0xf0000) >> 16)
    .byte   (\base & 0xff000000) >> 24
.endm

.macro CODE_SEG_DESCR name,base,limit,dpl
    SEG_DESCRIP \name,\base,1,1,0,\limit,1,\dpl,1,8
.endm

.macro CODE64_SEG_DESCR name,dpl
    SEG_DESCRIP \name, 0, 0, 0, 1, 0, 1, \dpl, 1, 8
.endm

.macro DATA_SEG_DESCR name,base,limit
    SEG_DESCRIP \name,\base,1,1,0,\limit,1,0,1,2
.endm

.macro DATA64_SEG_DESCR name,dpl
    SEG_DESCRIP \name,0,0,0,1,0,1,\dpl,1,2
.endm

.macro TSS_SEG_DESCR64 name,base
    SEG_DESCRIP \name,\base,0,0,0,\tsslength,1,0,0,9
    .quad 0
.endm