From eda205211a522312b667d5bd25d58bee8504c09e Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Thu, 7 Sep 2023 08:03:35 +0200 Subject: 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: Helge Deller --- arch/parisc/kernel/head.S | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'arch') diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S index fd15fd4bbb61..a171bf3c6b31 100644 --- a/arch/parisc/kernel/head.S +++ b/arch/parisc/kernel/head.S @@ -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 */ @@ -269,7 +269,17 @@ stext_pdc_ret: tovirt_r1 %r6 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 -- cgit v1.2.3