50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
|
|
* p->mem:
|
|
* text
|
|
* original data and bss
|
|
* fixed-size stack
|
|
* expandable heap
|
|
*/
|
|
|
|
/*
|
|
* segments in proc->gdt
|
|
*/
|
|
#define SEG_KCODE 1 // kernel code
|
|
#define SEG_KDATA 2 // kernel data+stack
|
|
#define SEG_UCODE 3
|
|
#define SEG_UDATA 4
|
|
#define SEG_TSS 5 // this process's task state
|
|
#define NSEGS 6
|
|
|
|
struct proc{
|
|
char *mem; // start of process's physical memory
|
|
unsigned sz; // total size of mem, including kernel stack
|
|
char *kstack; // kernel stack, separate from mem so it doesn't move
|
|
enum { UNUSED, RUNNABLE, WAITING, ZOMBIE, RUNNING } state;
|
|
int pid;
|
|
int ppid;
|
|
void *chan; // sleep
|
|
struct fd *fds[NOFILE];
|
|
|
|
struct Taskstate ts; // only to give cpu address of kernel stack
|
|
struct Segdesc gdt[NSEGS];
|
|
struct Pseudodesc gdt_pd;
|
|
unsigned esp; // kernel stack pointer
|
|
unsigned ebp; // kernel frame pointer
|
|
|
|
struct Trapframe *tf; // points into kstack, used to find user regs
|
|
};
|
|
|
|
extern struct proc proc[];
|
|
extern struct proc *curproc[NCPU];
|
|
|
|
#define MPSTACK 512
|
|
|
|
struct cpu {
|
|
uint8_t apicid; // Local APIC ID
|
|
char mpstack[MPSTACK]; // per-cpu start-up stack, only used to get into main()
|
|
};
|
|
|
|
extern struct cpu cpus[NCPU];
|
|
extern int ncpu;
|