From 72243c0194051f609fe3b24963465555c377eaaa Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Mon, 31 Oct 2011 13:30:45 -0500 Subject: powerpc/85xx: resize the boot page TLB before relocating CCSR On some Freescale systems (e.g. those booted from the on-chip ROM), the TLB that covers the boot page can also cover CCSR, which breaks the CCSR relocation code. To fix this, we resize the boot page TLB so that it only covers the 4KB boot page. Signed-off-by: Timur Tabi Signed-off-by: Kumar Gala --- arch/powerpc/cpu/mpc85xx/start.S | 49 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) (limited to 'arch/powerpc/cpu/mpc85xx/start.S') diff --git a/arch/powerpc/cpu/mpc85xx/start.S b/arch/powerpc/cpu/mpc85xx/start.S index d494528bd5..7bd5cc0b0f 100644 --- a/arch/powerpc/cpu/mpc85xx/start.S +++ b/arch/powerpc/cpu/mpc85xx/start.S @@ -318,6 +318,55 @@ l2_disabled: #endif /* CONFIG_MPC8569 */ +/* + * Search for the TLB that covers the code we're executing, and shrink it + * so that it covers only this 4K page. That will ensure that any other + * TLB we create won't interfere with it. We assume that the TLB exists, + * which is why we don't check the Valid bit of MAS1. + * + * This is necessary, for example, when booting from the on-chip ROM, + * which (oddly) creates a single 4GB TLB that covers CCSR and DDR. + * If we don't shrink this TLB now, then we'll accidentally delete it + * in "purge_old_ccsr_tlb" below. + */ + bl nexti /* Find our address */ +nexti: mflr r1 /* R1 = our PC */ + li r2, 0 + mtspr MAS6, r2 /* Assume the current PID and AS are 0 */ + isync + msync + tlbsx 0, r1 /* This must succeed */ + + /* Set the size of the TLB to 4KB */ + mfspr r3, MAS1 + li r2, 0xF00 + andc r3, r3, r2 /* Clear the TSIZE bits */ + ori r3, r3, MAS1_TSIZE(BOOKE_PAGESZ_4K)@l + mtspr MAS1, r3 + + /* + * Set the base address of the TLB to our PC. We assume that + * virtual == physical. We also assume that MAS2_EPN == MAS3_RPN. + */ + lis r3, MAS2_EPN@h + ori r3, r3, MAS2_EPN@l /* R3 = MAS2_EPN */ + + and r1, r1, r3 /* Our PC, rounded down to the nearest page */ + + mfspr r2, MAS2 + andc r2, r2, r3 + or r2, r2, r1 + mtspr MAS2, r2 /* Set the EPN to our PC base address */ + + mfspr r2, MAS3 + andc r2, r2, r3 + or r2, r2, r1 + mtspr MAS3, r2 /* Set the RPN to our PC base address */ + + isync + msync + tlbwe + /* * Relocate CCSR, if necessary. We relocate CCSR if (obviously) the default * location is not where we want it. This typically happens on a 36-bit -- cgit