Commit eda20521 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: BTLB: Clear possibly existing BTLB entries 



Call PDC to remove all existing BTLB entries (which may exist from
some previous operating system runs) before switching to virtual mode.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 70bd68d5

arch/parisc/kernel/head.S

+13 −3
Original line number Diff line number Diff line
@@ -180,10 +180,10 @@ $pgt_fill_loop: 
	std		%dp,0x18(%r10)

#endif



#ifdef CONFIG_64BIT

	/* Get PDCE_PROC for monarch CPU. */

#define MEM_PDC_LO 0x388

#define MEM_PDC_HI 0x35C

#ifdef CONFIG_64BIT

	/* Get PDCE_PROC for monarch CPU. */

	ldw             MEM_PDC_LO(%r0),%r3

	ldw             MEM_PDC_HI(%r0),%r10

	depd            %r10, 31, 32, %r3        /* move to upper word */
@@ -270,6 +270,16 @@ stext_pdc_ret: 
	mtctl		%r6,%cr30		/* restore task thread info */

#endif



#ifndef CONFIG_64BIT

	/* clear all BTLBs */

	ldi		PDC_BLOCK_TLB,%arg0

	load32          PA(stext_pdc_btlb_ret), %rp

	ldw             MEM_PDC_LO(%r0),%r3

	bv              (%r3)

	ldi		PDC_BTLB_PURGE_ALL,%arg1

stext_pdc_btlb_ret:

#endif



	/* PARANOID: clear user scratch/user space SR's */

	mtsp	%r0,%sr0

	mtsp	%r0,%sr1