kern
view src/proc.h @ 71:c7bd6ec7b946
changed test_proc to modify memory after the fork in order to try out copy-on-write,
by pushing the result of getpid on the stack.
| author | John Tsiombikas <nuclear@member.fsf.org> |
|---|---|
| date | Thu, 13 Oct 2011 05:22:35 +0300 |
| parents | 437360696883 |
| children | 3941e82b07f2 |
line source
1 #ifndef PROC_H_
2 #define PROC_H_
4 #include <inttypes.h>
5 #include "asmops.h"
6 #include "rbtree.h"
8 #define MAX_PROC 128
10 struct context {
11 /*struct registers regs;*/ /* saved general purpose registers */
12 /*uint32_t instr_ptr;*/ /* saved eip */
13 uint32_t stack_ptr; /* saved esp */
14 /*uint32_t flags;*/ /* saved eflags */
15 uint32_t pgtbl_paddr; /* physical address of the page table */
16 /* TODO add FPU state */
17 };
19 enum proc_state {
20 STATE_RUNNABLE,
21 STATE_BLOCKED,
22 STATE_ZOMBIE
23 };
26 struct process {
27 int id, parent;
28 enum proc_state state;
30 /* when blocked it's waiting for a wakeup on this address */
31 void *wait_addr;
33 int ticks_left;
35 /* process vm map */
36 struct rbtree vmmap;
38 /* extends of the process heap, increased by sbrk */
40 /* first page of the user stack, extends up to KMEM_START */
41 int user_stack_pg;
42 /* first page of the kernel stack, (KERN_STACK_SIZE) */
43 int kern_stack_pg;
45 struct context ctx;
47 struct process *next, *prev; /* for the scheduler queues */
48 };
50 void init_proc(void);
52 int fork(void);
54 void context_switch(int pid);
56 void set_current_pid(int pid);
57 int get_current_pid(void);
58 struct process *get_current_proc(void);
59 struct process *get_process(int pid);
61 /* defined in proc-asm.S */
62 uint32_t get_instr_ptr(void);
63 uint32_t get_caller_instr_ptr(void);
64 void get_instr_stack_ptr(uint32_t *iptr, uint32_t *sptr);
66 #endif /* PROC_H_ */