[LV-kern-commit] CVS: kernel-2.4/arch/vax/boot head.S,1.10,1.11

[Andy P. <at...@us...>]

Update of /cvsroot/linux-vax/kernel-2.4/arch/vax/boot
In directory usw-pr-cvs1:/tmp/cvs-serv28164

Modified Files:
	head.S 
Log Message:
PCB initialisation code prior to VM start. 


Index: head.S
===================================================================
RCS file: /cvsroot/linux-vax/kernel-2.4/arch/vax/boot/head.S,v
retrieving revision 1.10
retrieving revision 1.11
diff -u -r1.10 -r1.11
--- head.S	2001/06/24 19:34:56	1.10
+++ head.S	2001/07/02 12:09:24	1.11
@@ -3,6 +3,10 @@
 # start of boot. entry point
 # this assumes vmb has does most of the hard work (ie uvax rom vmb)
 # save useful registers. jump to c in boot.c
+#
+# TBD: Some of this stuff could do with being rewritten in C
+#      Some of this stuff could be in .init sections and thrown away.
+#
 
 #include <asm/mtpr.h>     /* Processor register definitions */
 #include <asm/mv.h>       /* machine vector definitions */
@@ -252,11 +256,21 @@
     movl r7, 20(r0)
     mtpr 16(r0), $PR_SBR		# set SBR
     mtpr r7, $PR_SLR	# set SLR
+# PCBB     
+# set up the process control block. Some machines need a valid PCB for 
+# mm to work properly. 
+# We should use the pcb for the init task for this, but Since this bit
+# should be done in C, rather than hardwiring offsets, I have put a fake 
+# PCB in a throwaway .init section below. 
+    moval fake_pcb,r9
+    movl $PAGE_OFFSET,88(r9)	# p1br
+    mtpr r9, $PR_PCBB
 # no need to TBIA - memory mapping not enabled
+# ready to turn on VM
     moval msg_starting_vm, r10
     jsb printstr
     jsb crlf
-    calls  $0, VAX_start_mm
+    calls  $0, VAX_start_mm     # do that ole black magic
 # made it 
     moval swapper_pg_dir, r0
     addl2 $PAGE_OFFSET, 16(r0)  # fix up our reference to the system page tbl.
@@ -371,3 +385,8 @@
 cpu_type:    .int 0x00000000
 prom_sidex:  .int 0x00000000
 	      
+# our dummy pcb	      
+.section .data.init
+.globl fake_pcb
+fake_pcb:    .fill 24,4,0x00000000
+