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https://github.com/drasko/codezero.git
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ba0e3ada21
Boot files and tasks are now initialised together. Theads can ask for particular space and thread ids, if they're unused. This enables us to get predefined ids for known tasks such as the VFS task. Fixes to README Other minor fixes.
126 lines
3.0 KiB
C
126 lines
3.0 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 from (%d). Full mr reading: "
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"%u, %u, %u, %u, %u, %u. Ignoring.\n",
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__TASKNAME__, tag, sender, read_mr(0),
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read_mr(1), read_mr(2), read_mr(3), read_mr(4),
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read_mr(5));
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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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