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Modified task initialisation so that stack now comes beneath the environment

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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
Download Patch File Download Diff File Expand all files Collapse all files

17
tasks/mm0/src/init.c
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@@ -11,22 +11,31 @@
#include <kmalloc/kmalloc.h>
#include <l4lib/arch/syscalls.h>
#include <l4lib/arch/syslib.h>
#include <l4lib/utcb.h>
#include <task.h>
#include <shm.h>
#include <file.h>
#include <init.h>
#include <utcb.h>
/* Initialise the utcb virtual address pool and its own utcb */
/*
* Initialise the utcb virtual address pool and its own utcb.
* NOTE: This allocates memory so kmalloc must be initialised first.
*/
void init_utcb(void)
{
void *utcb_virt, *utcb_page;
/* Allocate and map one for self */
if (utcb_pool_init() < 0)
printf("UTCB initialisation failed.\n");
utcb_virt = utcb_vaddr_new();
printf("%s: Mapping 0x%x as utcb to self.\n", __TASKNAME__, utcb_virt);
utcb_page = alloc_page(1);
l4_map(utcb_page, utcb_virt, 1, MAP_USR_RW_FLAGS, self_tid());
/* Also initialise the utcb reference that is used in l4lib. */
utcb = utcb_virt;
}
void init_mm(struct initdata *initdata)
@@ -43,9 +52,6 @@ void init_mm(struct initdata *initdata)
init_devzero();
printf("%s: Initialised devzero.\n", __TASKNAME__);
init_utcb();
printf("%s: Initialised own utcb.\n", __TASKNAME__);
/* Initialise the pager's memory allocator */
kmalloc_init();
printf("%s: Initialised kmalloc.\n", __TASKNAME__);
@@ -53,6 +59,9 @@ void init_mm(struct initdata *initdata)
shm_init();
printf("%s: Initialised shm structures.\n", __TASKNAME__);
init_utcb();
printf("%s: Initialised own utcb.\n", __TASKNAME__);
vmfile_init();
/* Give the kernel some memory to use for its allocators */