AppPkg/Applications/Python/Efi/cpu.asm
TITLE cpu.asm: Assembly code for the x64 resources
.CODE cpu_asm_code$__a
PUBLIC DisableInterrupts
PUBLIC WritePortDword
PUBLIC WritePortWord
PUBLIC WritePortByte
PUBLIC ReadPortDword
PUBLIC ReadPortWord
PUBLIC ReadPortByte
PUBLIC WriteHighCMOSByte
PUBLIC WriteLowCMOSByte
PUBLIC SendAPMSMI
PUBLIC WritePCIByte
PUBLIC WritePCIWord
PUBLIC WritePCIDword
PUBLIC ReadPCIByte
PUBLIC ReadPCIWord
PUBLIC ReadPCIDword
PUBLIC _rdmsr
PUBLIC _wrmsr
PUBLIC _load_gdt
PUBLIC _rflags
;------------------------------------------------------------------------------
; UINT64 _rflags()
;------------------------------------------------------------------------------
_rflags PROC
pushfq
pop rax
ret
_rflags ENDP
;------------------------------------------------------------------------------
; void _store_idtr(
; unsigned char *address // rcx
; )
;------------------------------------------------------------------------------
_store_idtr PROC
sidt fword ptr [rcx]
ret
_store_idtr ENDP
;------------------------------------------------------------------------------
; void _load_idtr(
; unsigned char *address // rcx
; )
;------------------------------------------------------------------------------
_load_idtr PROC
lidt fword ptr [rcx]
ret
_load_idtr ENDP
;------------------------------------------------------------------------------
; void _store_gdtr(
; unsigned char *address // rcx
; )
;------------------------------------------------------------------------------
_store_gdtr PROC
sgdt fword ptr [rcx]
ret
_store_gdtr ENDP
;------------------------------------------------------------------------------
; void _load_gdtr(
; unsigned char *address // rcx
; )
;------------------------------------------------------------------------------
_load_gdtr PROC
lgdt fword ptr [rcx]
ret
_load_gdtr ENDP
;------------------------------------------------------------------------------
; void _store_ldtr(
; unsigned char *address // rcx
; )
;------------------------------------------------------------------------------
_store_ldtr PROC
;sldt fword ptr [rcx]
ret
_store_ldtr ENDP
;------------------------------------------------------------------------------
; void _load_ldtr(
; unsigned char *address // rcx
; )
;------------------------------------------------------------------------------
_load_ldtr PROC
;lldt fword ptr [rcx]
ret
_load_ldtr ENDP
;------------------------------------------------------------------------------
; void _load_gdt(
; unsigned char *value // rcx
; )
;------------------------------------------------------------------------------
_load_gdt PROC
sgdt fword ptr [rcx]
lgdt fword ptr [rcx]
ret
_load_gdt ENDP
;------------------------------------------------------------------------------
; void _rdmsr(
; unsigned int msr_num, // rcx
; unsigned int* msr_lo, // rdx
; unsigned int* msr_hi // r8
; )
;------------------------------------------------------------------------------
_rdmsr PROC
push r10
push r11
push rax
push rdx
mov r10, rdx ; msr_lo
mov r11, r8 ; msr_hi
; rcx has msr_num
rdmsr
; Write MSR results in edx:eax
mov dword ptr [r10], eax
mov dword ptr [r11], edx
pop rdx
pop rax
pop r11
pop r10
ret
_rdmsr ENDP
;------------------------------------------------------------------------------
; void _wrmsr(
; unsigned int msr_num, // rcx
; unsigned int msr_hi, // rdx
; unsigned int msr_lo // r8
; )
;------------------------------------------------------------------------------
_wrmsr PROC
push rax
; rcx has msr_num
; rdx has msr_hi
; move msr_lo from r8 to rax
mov rax, r8
wrmsr
pop rax
ret
_wrmsr ENDP
;------------------------------------------------------------------------------
; void
; DisableInterrupts (
; )
;------------------------------------------------------------------------------
DisableInterrupts PROC
cli
ret
DisableInterrupts ENDP
;------------------------------------------------------------------------------
; void
; WritePortDword (
; unsigned int out_value // rcx
; unsigned short port_num // rdx
; )
;------------------------------------------------------------------------------
WritePortDword PROC
push rax
mov rax, rcx
out dx, rax
pop rax
ret
WritePortDword ENDP
;------------------------------------------------------------------------------
; void
; WritePortWord (
; unsigned short out_value // rcx
; unsigned short port_num // rdx
; )
;------------------------------------------------------------------------------
WritePortWord PROC
push rax
mov rax, rcx
out dx, ax
pop rax
ret
WritePortWord ENDP
;------------------------------------------------------------------------------
; void
; WritePortByte (
; unsigned char out_value // rcx
; unsigned short port_num // rdx
; )
;------------------------------------------------------------------------------
WritePortByte PROC
push rax
mov rax, rcx
out dx, al
pop rax
ret
WritePortByte ENDP
;------------------------------------------------------------------------------
; unsigned int
; ReadPortDword (
; unsigned short port_num // rcx
; )
;------------------------------------------------------------------------------
ReadPortDword PROC
push rdx
xor rax, rax
mov rdx, rcx
in eax, dx
pop rdx
ret
ReadPortDword ENDP
;------------------------------------------------------------------------------
; unsigned short
; ReadPortWord (
; unsigned short port_num // rcx
; )
;------------------------------------------------------------------------------
ReadPortWord PROC
push rdx
xor rax, rax
mov rdx, rcx
in ax, dx
pop rdx
ret
ReadPortWord ENDP
;------------------------------------------------------------------------------
; unsigned char
; ReadPortByte (
; unsigned short port_num // rcx
; )
;------------------------------------------------------------------------------
ReadPortByte PROC
push rdx
xor rax, rax
mov rdx, rcx
in al, dx
pop rdx
ret
ReadPortByte ENDP
;------------------------------------------------------------------------------
; void
; WriteHighCMOSByte (
; unsigned char cmos_off // rcx
; unsigned char val // rdx
; )
;------------------------------------------------------------------------------
WriteHighCMOSByte PROC
push rax
mov rax, rcx
out 72h, al
mov rax, rdx
out 73h, al
pop rax
ret
WriteHighCMOSByte ENDP
;------------------------------------------------------------------------------
; void
; WriteLowCMOSByte (
; unsigned char cmos_off // rcx
; unsigned char val // rdx
; )
;------------------------------------------------------------------------------
WriteLowCMOSByte PROC
push rax
mov rax, rcx
or al, 80h
out 70h, al
mov rax, rdx
out 71h, al
pop rax
ret
WriteLowCMOSByte ENDP
; @TODO: looks incorrect
;------------------------------------------------------------------------------
; void
; SendAPMSMI (
; unsigned int apm_port_value // rcx
; IN UINT64 rax_value // rdx
; )
;------------------------------------------------------------------------------
SendAPMSMI PROC
push rax
push rdx
mov rax, rcx
mov dx, 0B2h
out dx, rax
pop rdx
pop rax
ret
SendAPMSMI ENDP
;------------------------------------------------------------------------------
; void
; WritePCIByte (
; unsigned int pci_reg // rcx
; unsigned short cfg_data_port // rdx
; unsigned char byte_value // r8
; )
;------------------------------------------------------------------------------
WritePCIByte PROC
push rax
push rdx
cli
mov rax, rcx ; pci_reg
mov dx, 0CF8h
out dx, rax
mov rax, r8 ; byte_value
pop rdx ; cfg_data_port
out dx, al
sti
pop rax
ret
WritePCIByte ENDP
;------------------------------------------------------------------------------
; void
; WritePCIWord (
; unsigned int pci_reg // rcx
; unsigned short cfg_data_port // rdx
; unsigned short word_value // r8
; )
;------------------------------------------------------------------------------
WritePCIWord PROC
push rax
push rdx
cli
mov rax, rcx ; pci_reg
mov dx, 0CF8h
out dx, rax
mov rax, r8 ; byte_value
pop rdx ; cfg_data_port
out dx, ax
sti
pop rax
ret
WritePCIWord ENDP
;------------------------------------------------------------------------------
; void
; WritePCIDword (
; unsigned int pci_reg // rcx
; unsigned short cfg_data_port // rdx
; unsigned int dword_value // r8
; )
;------------------------------------------------------------------------------
WritePCIDword PROC
push rax
push rdx
cli
mov rax, rcx ; pci_reg
mov dx, 0CF8h
out dx, rax
mov rax, r8 ; byte_value
pop rdx ; cfg_data_port
out dx, eax
sti
pop rax
ret
WritePCIDword ENDP
;------------------------------------------------------------------------------
; unsigned char
; ReadPCIByte (
; unsigned int pci_reg // rcx
; unsigned short cfg_data_port // rdx
; )
;------------------------------------------------------------------------------
ReadPCIByte PROC
push rdx
cli
mov rax, rcx ; pci_reg
mov dx, 0CF8h
out dx, rax
xor rax, rax
pop rdx ; cfg_data_port
in al, dx
sti
ret
ReadPCIByte ENDP
;------------------------------------------------------------------------------
; unsigned short
; ReadPCIWord (
; unsigned int pci_reg // rcx
; unsigned short cfg_data_port // rdx
; )
;------------------------------------------------------------------------------
ReadPCIWord PROC
push rdx
cli
mov rax, rcx ; pci_reg
mov dx, 0CF8h
out dx, rax
xor rax, rax
pop rdx ; cfg_data_port
in ax, dx
sti
ret
ReadPCIWord ENDP
;------------------------------------------------------------------------------
; unsigned int
; ReadPCIDword (
; unsigned int pci_reg // rcx
; unsigned short cfg_data_port // rdx
; )
;------------------------------------------------------------------------------
ReadPCIDword PROC
push rdx
cli
mov rax, rcx ; pci_reg
mov dx, 0CF8h
out dx, rax
xor rax, rax
pop rdx ; cfg_data_port
in eax, dx
sti
ret
ReadPCIDword ENDP
END