PERFORCE change 107822 for review

[Oleksandr Tymoshenko]

http://perforce.freebsd.org/chv.cgi?CH=107822

Change 107822 by gonzo at gonzo_hq on 2006/10/13 14:25:55

	o Keep realstack pointer and pte0,  pte1 for this pointer in
	    machine-dependant fields of thread struct for further use.

Affected files ...

.. //depot/projects/mips2/src/sys/mips/include/proc.h#4 edit
.. //depot/projects/mips2/src/sys/mips/mips/vm_machdep.c#9 edit

Differences ...

==== //depot/projects/mips2/src/sys/mips/include/proc.h#4 (text+ko) ====

@@ -33,14 +33,18 @@
 #ifndef _MACHINE_PROC_H_
 #define	_MACHINE_PROC_H_
 
+#include <machine/pte.h>
+
 /*
  * Machine-dependent part of the proc structure for AMD64.
  */
 struct mdthread {
-	int	md_flags;		/* machine-dependent flags */
-	void	*md_regs;		/* registers on current frame */
-	__register_t md_saved_sr;	/* critical section saved SR */
-	int	md_spinlock_count;
+	int		md_flags;	/* machine-dependent flags */
+	void		*md_regs;	/* registers on current frame */
+	__register_t	md_saved_sr;	/* critical section saved SR */
+	vm_offset_t	md_realstack;
+	pt_entry_t	md_stack_pte[2];
+	int		md_spinlock_count;
 };
 
 struct mdproc {

==== //depot/projects/mips2/src/sys/mips/mips/vm_machdep.c#9 (text+ko) ====

@@ -40,6 +40,7 @@
 #include <machine/cpu.h>
 #include <machine/pcb.h>
 #include <machine/sysarch.h>
+#include <machine/tlb.h>
 #include <vm/vm.h>
 #include <vm/pmap.h>
 #include <sys/lock.h>
@@ -178,8 +179,31 @@
 void
 cpu_thread_setup(struct thread *td)
 {
+	pt_entry_t *pte;
+	/* 
+	 * To use wired TLB we should have even-aligned virtual address
+         * Since there is no way to specify alignment for td_kstack we
+	 * drop KSTACK_GUARD support and request 3 pages for kstack.
+	 * And use first even-aligned page number.
+	 */
+	if(td->td_kstack & (1 << PAGE_SHIFT))
+		td->td_md.md_realstack = td->td_kstack + PAGE_SIZE;
+	else
+		td->td_md.md_realstack = td->td_kstack;
+
+	/*
+	 * Fill out PTEs to be wired then
+	 */	 
+	pte = tlb_kern_pte_find(kptmap, td->td_md.md_realstack);
+	td->td_md.md_stack_pte[0] = *pte;
+
+	pte = tlb_kern_pte_find(kptmap, td->td_md.md_realstack + PAGE_SIZE);
+	td->td_md.md_stack_pte[1] = *pte;
+
+
 	td->td_pcb =
-	    (struct pcb *)(td->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
+	    (struct pcb *)(td->td_md.md_realstack \
+			    + (KSTACK_PAGES - 1) * PAGE_SIZE) - 1;
 	td->td_frame = (struct trapframe *)td->td_pcb - 1;
 
 	/*