76 lines
1.9 KiB
ArmAsm
76 lines
1.9 KiB
ArmAsm
|
.sect .text; .sect .rom; .sect .data; .sect .bss
|
||
|
|
.define __ipc_request, __ipc_reply, __ipc_notify, __ipc_receive
|
||
|
|
|
||
|
|
! See src/kernel/ipc.h for C definitions.
|
||
|
|
IPC_REQUEST = 16 ! each gets a distinct bit
|
||
|
|
IPC_REPLY = 32
|
||
|
|
IPC_NOTIFY = 64
|
||
|
|
IPC_RECEIVE = 128
|
||
|
|
|
||
|
|
SYSVEC = 33 ! trap to kernel
|
||
|
|
|
||
|
|
! Offsets of arguments relative to stack pointer.
|
||
|
|
SRC_DST = 8 ! source/ destination process
|
||
|
|
SEND_MSG = 12 ! message pointer for sending
|
||
|
|
EVENT_SET = 12 ! notification event set
|
||
|
|
RECV_MSG = 16 ! message pointer for receiving
|
||
|
|
|
||
|
|
|
||
|
|
!*========================================================================*
|
||
|
|
! IPC assembly routines *
|
||
|
|
!*========================================================================*
|
||
|
|
! all message passing routines save ebp, but destroy eax, ecx, and edx.
|
||
|
|
.define __ipc_request, __ipc_reply, __ipc_notify, __ipc_receive
|
||
|
|
.sect .text
|
||
|
|
|
||
|
|
__ipc_request:
|
||
|
|
push ebp
|
||
|
|
mov ebp, esp
|
||
|
|
push ebx
|
||
|
|
mov eax, SRC_DST(ebp) ! eax = destination
|
||
|
|
mov ebx, SEND_MSG(ebp) ! ebx = message pointer
|
||
|
|
mov ecx, IPC_REQUEST ! _ipc_request(dst, ptr)
|
||
|
|
int SYSVEC ! trap to the kernel
|
||
|
|
pop ebx
|
||
|
|
pop ebp
|
||
|
|
ret
|
||
|
|
|
||
|
|
__ipc_reply:
|
||
|
|
push ebp
|
||
|
|
mov ebp, esp
|
||
|
|
push ebx
|
||
|
|
mov eax, SRC_DST(ebp) ! eax = destination
|
||
|
|
mov ebx, SEND_MSG(ebp) ! ebx = message pointer
|
||
|
|
mov ecx, IPC_REPLY ! _ipc_reply(dst, ptr)
|
||
|
|
int SYSVEC ! trap to the kernel
|
||
|
|
pop ebx
|
||
|
|
pop ebp
|
||
|
|
ret
|
||
|
|
|
||
|
|
__ipc_receive:
|
||
|
|
push ebp
|
||
|
|
mov ebp, esp
|
||
|
|
push ebx
|
||
|
|
mov eax, SRC_DST(ebp) ! eax = source
|
||
|
|
mov edx, EVENT_SET(ebp) ! ebx = event set
|
||
|
|
mov ebx, RCV_MSG(ebp) ! ebx = message pointer
|
||
|
|
mov ecx, IPC_RECEIVE ! _ipc_receive(src, events, ptr)
|
||
|
|
int SYSVEC ! trap to the kernel
|
||
|
|
pop ebx
|
||
|
|
pop ebp
|
||
|
|
ret
|
||
|
|
|
||
|
|
__ipc_notify:
|
||
|
|
push ebp
|
||
|
|
mov ebp, esp
|
||
|
|
push ebx
|
||
|
|
mov eax, SRC_DST(ebp) ! ebx = destination
|
||
|
|
mov edx, EVENT_SET(ebp) ! edx = event set
|
||
|
|
mov ecx, IPC_NOTIFY ! _ipc_notify(dst, events)
|
||
|
|
int SYSVEC ! trap to the kernel
|
||
|
|
pop ebx
|
||
|
|
pop ebp
|
||
|
|
ret
|
||
|
|
|
||
|
|
|