8b4e2a08fe
swtch idles on per-CPU stack, not on calling process's stack fix pipe bugs usertest.c tests pipes, fork, exit, close
51 lines
1.2 KiB
C
51 lines
1.2 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 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 { UNUSED, RUNNABLE, WAITING, ZOMBIE, RUNNING } state;
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int pid;
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int ppid;
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void *chan; // sleep
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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 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];
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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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int lintr[2]; // Local APIC
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char mpstack[MPSTACK]; // per-cpu start-up stack, only used to get into main()
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};
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extern struct cpu cpus[NCPU];
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extern int ncpu;
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