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Reimplemented space handling by introducing an address_space structure.

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- Fixed potential concurrency bugs due to preemption being enabled.
- Introduced a new address space structure to better account for
  address spaces and page tables.
- Currently executes fine up to forking. Will investigate.
This commit is contained in:
Bahadir Balban
2009-05-08 23:35:19 +03:00
parent 2df8875a88
commit 7415546410
12 changed files with 403 additions and 81 deletions
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2
include/l4/arch/arm/v5/mm.h
View File

@@ -137,6 +137,8 @@ void arch_hardware_flush(pgd_table_t *pgd);
void add_section_mapping_init(unsigned int paddr, unsigned int vaddr,
unsigned int size, unsigned int flags);
struct address_space;
int copy_user_tables(struct address_space *new, struct address_space *orig);
pgd_table_t *copy_page_tables(pgd_table_t *from);
void remap_as_pages(void *vstart, void *vend);

12
include/l4/generic/space.h
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@@ -21,15 +21,27 @@
#if defined (__KERNEL__)
#include <l4/lib/list.h>
#include <l4/lib/mutex.h>
#include INC_SUBARCH(mm.h)
/* A simple page table with a reference count */
struct address_space {
l4id_t spid;
struct list_head list;
struct mutex lock;
pgd_table_t *pgd;
int ktcb_refs;
};
struct address_space *address_space_create(struct address_space *orig);
void address_space_delete(struct address_space *space);
void address_space_attach(struct ktcb *tcb, struct address_space *space);
struct address_space *address_space_find(l4id_t spid);
void address_space_add(struct address_space *space);
void address_space_remove(struct address_space *space);
void address_space_reference_lock();
void address_space_reference_unlock();
void init_address_space_list(void);
int check_access(unsigned long vaddr, unsigned long size, unsigned int flags);
#endif

27
include/l4/generic/tcb.h
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@@ -109,24 +109,6 @@ union ktcb_union {
char kstack[PAGE_SIZE];
};
/* For traversing global task list */
extern struct list_head global_task_list;
static inline struct ktcb *find_task(l4id_t tid)
{
struct ktcb *task;
list_for_each_entry(task, &global_task_list, task_list)
if (task->tid == tid)
return task;
return 0;
}
static inline int add_task_global(struct ktcb *new)
{
INIT_LIST_HEAD(&new->task_list);
list_add(&new->task_list, &global_task_list);
return 0;
}
/*
* Each task is allocated a unique global id. A thread group can only belong to
@@ -151,6 +133,15 @@ extern struct id_pool *thread_id_pool;
extern struct id_pool *space_id_pool;
extern struct id_pool *tgroup_id_pool;
struct ktcb *tcb_find(l4id_t tid);
void tcb_add(struct ktcb *tcb);
void tcb_remove(struct ktcb *tcb);
void tcb_init(struct ktcb *tcb);
struct ktcb *tcb_alloc_init(void);
void tcb_delete(struct ktcb *tcb);
void init_ktcb_list(void);
void task_update_utcb(struct ktcb *cur, struct ktcb *next);
#endif /* __TCB_H__ */