1 files changed, 105 insertions, 0 deletions
diff --git a/kernel/proc.h b/kernel/proc.h
new file mode 100644
index 0000000..655d79f
--- /dev/null
+++ b/kernel/proc.h
@@ -0,0 +1,105 @@
+// Saved registers for kernel context switches.
+struct context {
+  uint64 ra;
+  uint64 sp;
+
+  // callee-saved
+  uint64 s0;
+  uint64 s1;
+  uint64 s2;
+  uint64 s3;
+  uint64 s4;
+  uint64 s5;
+  uint64 s6;
+  uint64 s7;
+  uint64 s8;
+  uint64 s9;
+  uint64 s10;
+  uint64 s11;
+};
+
+// Per-CPU state.
+struct cpu {
+  struct proc *proc;          // The process running on this cpu, or null.
+  struct context scheduler;   // swtch() here to enter scheduler().
+  int noff;                   // Depth of push_off() nesting.
+  int intena;                 // Were interrupts enabled before push_off()?
+};
+
+extern struct cpu cpus[NCPU];
+
+// per-process data for the trap handling code in trampoline.S.
+// sits in a page by itself just under the trampoline page in the
+// user page table. not specially mapped in the kernel page table.
+// the sscratch register points here.
+// uservec in trampoline.S saves user registers in the trapframe,
+// then initializes registers from the trapframe's
+// kernel_sp, kernel_hartid, kernel_satp, and jumps to kernel_trap.
+// usertrapret() and userret in trampoline.S set up
+// the trapframe's kernel_*, restore user registers from the
+// trapframe, switch to the user page table, and enter user space.
+// the trapframe includes callee-saved user registers like s0-s11 because the
+// return-to-user path via usertrapret() doesn't return through
+// the entire kernel call stack.
+struct trapframe {
+  /*   0 */ uint64 kernel_satp;   // kernel page table
+  /*   8 */ uint64 kernel_sp;     // top of process's kernel stack
+  /*  16 */ uint64 kernel_trap;   // usertrap()
+  /*  24 */ uint64 epc;           // saved user program counter
+  /*  32 */ uint64 kernel_hartid; // saved kernel tp
+  /*  40 */ uint64 ra;
+  /*  48 */ uint64 sp;
+  /*  56 */ uint64 gp;
+  /*  64 */ uint64 tp;
+  /*  72 */ uint64 t0;
+  /*  80 */ uint64 t1;
+  /*  88 */ uint64 t2;
+  /*  96 */ uint64 s0;
+  /* 104 */ uint64 s1;
+  /* 112 */ uint64 a0;
+  /* 120 */ uint64 a1;
+  /* 128 */ uint64 a2;
+  /* 136 */ uint64 a3;
+  /* 144 */ uint64 a4;
+  /* 152 */ uint64 a5;
+  /* 160 */ uint64 a6;
+  /* 168 */ uint64 a7;
+  /* 176 */ uint64 s2;
+  /* 184 */ uint64 s3;
+  /* 192 */ uint64 s4;
+  /* 200 */ uint64 s5;
+  /* 208 */ uint64 s6;
+  /* 216 */ uint64 s7;
+  /* 224 */ uint64 s8;
+  /* 232 */ uint64 s9;
+  /* 240 */ uint64 s10;
+  /* 248 */ uint64 s11;
+  /* 256 */ uint64 t3;
+  /* 264 */ uint64 t4;
+  /* 272 */ uint64 t5;
+  /* 280 */ uint64 t6;
+};
+
+enum procstate { UNUSED, SLEEPING, RUNNABLE, RUNNING, ZOMBIE };
+
+// Per-process state
+struct proc {
+  struct spinlock lock;
+
+  // p->lock must be held when using these:
+  enum procstate state;        // Process state
+  struct proc *parent;         // Parent process
+  void *chan;                  // If non-zero, sleeping on chan
+  int killed;                  // If non-zero, have been killed
+  int pid;                     // Process ID
+
+  // these are private to the process, so p->lock need not be held.
+  uint64 kstack;               // Bottom of kernel stack for this process
+  uint64 sz;                   // Size of process memory (bytes)
+  pagetable_t pagetable;       // Page table
+  struct trapframe *tf;        // data page for trampoline.S
+  struct context context;      // swtch() here to run process
+  struct file *ofile[NOFILE];  // Open files
+  struct inode *cwd;           // Current directory
+  char name[16];               // Process name (debugging)
+};