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Modified task initialisation so that stack now comes beneath the environment

Browse Source 
Environment is backed by a special per-task file maintained by mm0 for each task.
This file is filled in by the env pager, by simple copying of env data into the
faulty page upon a fault. UTCB and all anon regions (stack) could use the same
scheme.

Fixed IS_ERR(x) to accept negative values that are above -1000 for errors. This
protects against false positives for pointers such as 0xE0000000.

	modified:   include/l4/generic/scheduler.h
	modified:   include/l4/macros.h
	modified:   src/arch/arm/exception.c
	modified:   tasks/fs0/include/linker.lds
	modified:   tasks/libl4/src/init.c
	modified:   tasks/libposix/shm.c
	new file:   tasks/mm0/include/env.h
	modified:   tasks/mm0/include/file.h
	new file:   tasks/mm0/include/lib/addr.h
	deleted:    tasks/mm0/include/lib/vaddr.h
	modified:   tasks/mm0/include/task.h
	new file:   tasks/mm0/include/utcb.h
	new file:   tasks/mm0/src/env.c
	modified:   tasks/mm0/src/fault.c
	modified:   tasks/mm0/src/file.c
	modified:   tasks/mm0/src/init.c
	new file:   tasks/mm0/src/lib/addr.c
	modified:   tasks/mm0/src/lib/idpool.c
	deleted:    tasks/mm0/src/lib/vaddr.c
	modified:   tasks/mm0/src/mmap.c
	modified:   tasks/mm0/src/shm.c
	modified:   tasks/mm0/src/task.c
	new file:   tasks/mm0/src/utcb.c
	modified:   tasks/test0/include/linker.lds
This commit is contained in:
Bahadir Balban
2008-02-29 01:43:56 +00:00
parent 5b7bb88008
commit 617d24b4f0
24 changed files with 316 additions and 144 deletions
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44
tasks/mm0/src/lib/addr.c Normal file
View File

@@ -0,0 +1,44 @@
/*
* This module allocates an unused address range from
* a given memory region defined as the pool range.
*
* Copyright (C) 2007 Bahadir Balban
*/
#include <lib/bit.h>
#include <l4/macros.h>
#include <l4/types.h>
#include INC_GLUE(memory.h)
#include <lib/addr.h>
#include <stdio.h>
int address_pool_init(struct address_pool *pool, unsigned long start, unsigned long end)
{
if ((pool->idpool = id_pool_new_init(__pfn(end - start))) < 0)
return (int)pool->idpool;
pool->start = start;
pool->end = end;
return 0;
}
void *address_new(struct address_pool *pool, int npages)
{
unsigned int pfn;
if ((int)(pfn = ids_new_contiguous(pool->idpool, npages)) < 0)
return 0;
return (void *)__pfn_to_addr(pfn) + pool->start;
}
int address_del(struct address_pool *pool, void *addr, int npages)
{
unsigned long pfn = __pfn(page_align(addr) - pool->start);
if (ids_del_contiguous(pool->idpool, pfn, npages) < 0) {
printf("%s: Invalid address range returned to "
"virtual address pool.\n", __FUNCTION__);
return -1;
}
return 0;
}

3
tasks/mm0/src/lib/idpool.c
View File

@@ -7,12 +7,15 @@
#include <kmalloc/kmalloc.h>
#include INC_GLUE(memory.h)
#include <stdio.h>
#include <l4/api/errno.h>
struct id_pool *id_pool_new_init(int totalbits)
{
int nwords = BITWISE_GETWORD(totalbits);
struct id_pool *new = kzalloc((nwords * SZ_WORD)
+ sizeof(struct id_pool));
if (!new)
return PTR_ERR(-ENOMEM);
new->nwords = nwords;
return new;
}

39
tasks/mm0/src/lib/vaddr.c
View File

@@ -1,39 +0,0 @@
/*
* This module allocates an unused virtual address range for shm segments.
*
* Copyright (C) 2007 Bahadir Balban
*/
#include <lib/bit.h>
#include <l4/macros.h>
#include <l4/types.h>
#include INC_GLUE(memory.h)
#include <lib/vaddr.h>
#include <stdio.h>
void vaddr_pool_init(struct id_pool *pool, unsigned long start, unsigned long end)
{
pool = id_pool_new_init(__pfn(end - start));
}
void *vaddr_new(struct id_pool *pool, int npages)
{
unsigned int shm_vpfn;
if ((int)(shm_vpfn = ids_new_contiguous(pool, npages)) < 0)
return 0;
return (void *)__pfn_to_addr(shm_vpfn + SHM_AREA_START);
}
int vaddr_del(struct id_pool *pool, void *vaddr, int npages)
{
unsigned long idpfn = __pfn(page_align(vaddr) - SHM_AREA_START);
if (ids_del_contiguous(pool, idpfn, npages) < 0) {
printf("%s: Invalid address range returned to "
"virtual address pool.\n", __FUNCTION__);
return -1;
}
return 0;
}