77 lines
2 KiB
C
77 lines
2 KiB
C
/*
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* p->mem:
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* text
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* original data and bss
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* fixed-size stack
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* expandable heap
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*/
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/*
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* segments in proc->gdt
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*/
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#define SEG_KCODE 1 // kernel code
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#define SEG_KDATA 2 // kernel data+stack
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#define SEG_UCODE 3
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#define SEG_UDATA 4
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#define SEG_TSS 5 // this process's task state
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#define NSEGS 6
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struct jmpbuf {
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// saved registers for kernel context switches
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// don't need to save all the fs etc. registers because
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// they are constant across kernel contexts
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// save all the regular registers so we don't care which are caller save
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// don't save eax because that's the return register
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// layout known to setjmp.S
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int ebx;
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int ecx;
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int edx;
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int esi;
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int edi;
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int esp;
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int ebp;
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int eip;
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};
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enum proc_state { UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };
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struct proc{
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char *mem; // start of process's physical memory
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unsigned sz; // total size of mem, including kernel stack
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char *kstack; // kernel stack, separate from mem so it doesn't move
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enum proc_state state;
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enum proc_state newstate; // desired state after swtch()
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struct spinlock *mtx; // mutex for condition variable
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int pid;
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int ppid;
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void *chan; // sleep
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int killed;
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struct fd *fds[NOFILE];
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struct Taskstate ts; // only to give cpu address of kernel stack
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struct Segdesc gdt[NSEGS];
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struct Pseudodesc gdt_pd;
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unsigned esp; // kernel stack pointer
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unsigned ebp; // kernel frame pointer
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struct jmpbuf jmpbuf;
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struct Trapframe *tf; // points into kstack, used to find user regs
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};
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extern struct proc proc[];
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extern struct proc *curproc[NCPU]; // can be NULL if no proc running.
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// XXX move curproc into cpu structure?
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#define MPSTACK 512
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struct cpu {
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uint8_t apicid; // Local APIC ID
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struct jmpbuf jmpbuf;
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char mpstack[MPSTACK]; // per-cpu start-up stack, only used to get into main()
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struct proc *lastproc; // last proc scheduled on this cpu (never NULL)
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int nlock; // # of locks currently held
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};
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extern struct cpu cpus[NCPU];
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extern int ncpu;
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