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https://github.com/drasko/codezero.git
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122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/*
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* mm0. Pager for all tasks.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#include <stdio.h>
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#include <init.h>
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#include <l4lib/arch/message.h>
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#include <l4lib/arch/syscalls.h>
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#include <l4lib/arch/syslib.h>
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#include <l4lib/kip.h>
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#include <l4lib/utcb.h>
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#include <l4lib/ipcdefs.h>
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#include <l4/api/thread.h>
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#include <l4/api/space.h>
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#include <l4/api/ipc.h>
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#include <shm.h>
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#include <task.h>
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#include <vm_area.h>
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#include <syscalls.h>
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/* FIXME:LOCKING:FIXME:LOCKING:FIXME:LOCKING
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* NOTE: For multithreadded MM0, not suprisingly, we need locking on
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* vmas, vm_files, and all global variables. Also at times, the per-task
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* lists of items (e.g. vmas) must be entirely locked. Pages already have
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* locking.
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*/
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void handle_requests(void)
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{
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/* Generic ipc data */
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u32 mr[MR_UNUSED_TOTAL];
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l4id_t sender;
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u32 tag;
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int err;
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printf("%s: Initiating ipc.\n", __TASKNAME__);
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if ((err = l4_receive(L4_ANYTHREAD)) < 0) {
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printf("%s: %s: IPC Error: %d. Quitting...\n", __TASKNAME__,
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__FUNCTION__, err);
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BUG();
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}
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/* Syslib conventional ipc data which uses first few mrs. */
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tag = l4_get_tag();
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sender = l4_get_sender();
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/* Read mrs not used by syslib */
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for (int i = 0; i < MR_UNUSED_TOTAL; i++)
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mr[i] = read_mr(MR_UNUSED_START + i);
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switch(tag) {
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case L4_IPC_TAG_WAIT:
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/*
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* A thread that wants to sync with us would have
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* started here.
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*/
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printf("%s: Synced with waiting thread.\n", __TASKNAME__);
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break;
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case L4_IPC_TAG_PFAULT:
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/* Handle page fault. */
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page_fault_handler(sender, (fault_kdata_t *)&mr[0]);
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break;
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case L4_IPC_TAG_TASKDATA:
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send_task_data(sender);
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break;
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case L4_IPC_TAG_SHMGET: {
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struct sys_shmget_args *args = (struct sys_shmget_args *)&mr[0];
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sys_shmget(args->key, args->size, args->shmflg);
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break;
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}
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case L4_IPC_TAG_SHMAT: {
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struct sys_shmat_args *args = (struct sys_shmat_args *)&mr[0];
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sys_shmat(sender, args->shmid, args->shmaddr, args->shmflg);
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break;
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}
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case L4_IPC_TAG_SHMDT:
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sys_shmdt(sender, (void *)mr[0]);
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break;
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case L4_IPC_TAG_MMAP: {
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struct sys_mmap_args *args = (struct sys_mmap_args *)&mr[0];
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BUG(); /* FIXME: There are 8 arguments to ipc whereas there are 7 mrs available. Fix this by increasing MRs to 8 ??? */
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sys_mmap(sender, args->start, args->length, args->prot, args->flags, args->fd, args->offset);
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break;
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}
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case L4_IPC_TAG_BRK: {
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// sys_brk(sender, (void *)mr[0]);
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// break;
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}
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case L4_IPC_TAG_MUNMAP: {
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/* TODO: Use arg struct instead */
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// sys_munmap(sender, (void *)mr[0], (int)mr[1]);
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break;
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}
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case L4_IPC_TAG_MSYNC: {
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/* TODO: Use arg struct instead */
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// sys_msync(sender, (void *)mr[0], (int)mr[1], (int)mr[2]);
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break;
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}
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default:
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printf("%s: Unrecognised ipc tag (%d)"
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"received. Ignoring.\n", __TASKNAME__, mr[MR_TAG]);
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}
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}
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void main(void)
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{
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/* Initialise the memory, server tasks, mmap and start them. */
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initialise();
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while (1) {
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handle_requests();
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}
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}
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