76 lines
1.9 KiB
C
76 lines
1.9 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 jmpbuf {
|
|
// saved registers for kernel context switches
|
|
// don't need to save all the fs etc. registers because
|
|
// they are constant across kernel contexts
|
|
// save all the regular registers so we don't care which are caller save
|
|
// don't save eax because that's the return register
|
|
// layout known to setjmp.S
|
|
int ebx;
|
|
int ecx;
|
|
int edx;
|
|
int esi;
|
|
int edi;
|
|
int esp;
|
|
int ebp;
|
|
int eip;
|
|
};
|
|
|
|
enum proc_state { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };
|
|
|
|
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 proc_state state;
|
|
enum proc_state newstate; // desired state after swtch()
|
|
struct spinlock *mtx; // mutex for condition variable
|
|
int pid;
|
|
int ppid;
|
|
void *chan; // sleep
|
|
int killed;
|
|
struct fd *fds[NOFILE];
|
|
|
|
struct Taskstate ts; // only to give cpu address of kernel stack
|
|
struct Segdesc gdt[NSEGS];
|
|
unsigned esp; // kernel stack pointer
|
|
unsigned ebp; // kernel frame pointer
|
|
|
|
struct jmpbuf jmpbuf;
|
|
|
|
struct Trapframe *tf; // points into kstack, used to find user regs
|
|
};
|
|
|
|
extern struct proc proc[];
|
|
extern struct proc *curproc[NCPU]; // can be NULL if no proc running.
|
|
// XXX move curproc into cpu structure?
|
|
|
|
#define MPSTACK 512
|
|
|
|
struct cpu {
|
|
uint8_t apicid; // Local APIC ID
|
|
struct jmpbuf jmpbuf;
|
|
char mpstack[MPSTACK]; // per-cpu start-up stack, only used to get into main()
|
|
struct proc *lastproc; // last proc scheduled on this cpu (never NULL)
|
|
int nlock; // # of locks currently held
|
|
};
|
|
|
|
extern struct cpu cpus[NCPU];
|
|
extern int ncpu;
|