diff options
Diffstat (limited to 'proc.h')
| -rw-r--r-- | proc.h | 24 |
1 files changed, 23 insertions, 1 deletions
@@ -16,6 +16,23 @@ #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 @@ -32,17 +49,22 @@ struct proc{ 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]; +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]; |