xv6/proc.h
rtm b548df152b pre-empt both user and kernel, in clock interrupt
usertest.c tests pre-emption
kill()
2006-07-11 17:39:45 +00:00

72 lines
1.8 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 swtch.S
int jb_ebx;
int jb_ecx;
int jb_edx;
int jb_esi;
int jb_edi;
int jb_esp;
int jb_ebp;
int jb_eip;
};
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
int killed;
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 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)
};
extern struct cpu cpus[NCPU];
extern int ncpu;