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Groups > linux.kernel > #1230644
| From | Paul Burton <paul.burton@imgtec.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 04/10] MIPS: CPS: read CM GCR base from cop0 |
| Date | 2015-09-22 20:20 +0200 |
| Message-ID | <qbAkz-4J7-45@gated-at.bofh.it> (permalink) |
| References | <qbAkx-4J7-5@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Rather than patching the start of mips_cps_core_entry to provide the base address of the CM GCRs, simply read that base address from the cop0 CMGCRBase register, converting from the physical address to an uncached virtual address. Signed-off-by: Paul Burton <paul.burton@imgtec.com> --- arch/mips/kernel/cps-vec.S | 12 ++++++++---- arch/mips/kernel/smp-cps.c | 2 -- 2 files changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/mips/kernel/cps-vec.S b/arch/mips/kernel/cps-vec.S index a9cc16a..5407ce4 100644 --- a/arch/mips/kernel/cps-vec.S +++ b/arch/mips/kernel/cps-vec.S @@ -66,11 +66,9 @@ LEAF(mips_cps_core_entry) /* - * These first 12 bytes will be patched by cps_smp_setup to load the - * base address of the CM GCRs into register v1 and the CCA to use into - * register s0. + * These first 4 bytes will be patched by cps_smp_setup to load the + * CCA to use into register s0. */ - .quad 0 .word 0 /* Check whether we're here due to an NMI */ @@ -170,6 +168,12 @@ dcache_done: mtc0 t0, CP0_CONFIG ehb + /* Calculate an uncached address for the CM GCRs */ + MFC0 v1, CP0_CMGCRBASE + PTR_SLL v1, v1, 4 + PTR_LI t0, UNCAC_BASE + PTR_ADDU v1, v1, t0 + /* Enter the coherent domain */ li t0, 0xff sw t0, GCR_CL_COHERENCE_OFS(v1) diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c index c889377..8b96750 100644 --- a/arch/mips/kernel/smp-cps.c +++ b/arch/mips/kernel/smp-cps.c @@ -133,11 +133,9 @@ static void __init cps_prepare_cpus(unsigned int max_cpus) /* * Patch the start of mips_cps_core_entry to provide: * - * v1 = CM base address * s0 = kseg0 CCA */ entry_code = (u32 *)&mips_cps_core_entry; - UASM_i_LA(&entry_code, 3, (long)mips_cm_base); uasm_i_addiu(&entry_code, 16, 0, cca); blast_dcache_range((unsigned long)&mips_cps_core_entry, (unsigned long)entry_code); -- 2.5.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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[PATCH 04/10] MIPS: CPS: read CM GCR base from cop0 Paul Burton <paul.burton@imgtec.com> - 2015-09-22 20:20 +0200
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