164 lines
3.3 KiB
C
164 lines
3.3 KiB
C
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/*
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* arch/xtensa/include/asm/initialize_mmu.h
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*
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* Initializes MMU:
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*
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* For the new V3 MMU we remap the TLB from virtual == physical
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* to the standard Linux mapping used in earlier MMU's.
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*
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* The the MMU we also support a new configuration register that
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* specifies how the S32C1I instruction operates with the cache
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* controller.
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*
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* This file is subject to the terms and conditions of the GNU General
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* Public License. See the file "COPYING" in the main directory of
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* this archive for more details.
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*
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* Copyright (C) 2008 - 2012 Tensilica, Inc.
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*
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* Marc Gauthier <marc@tensilica.com>
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* Pete Delaney <piet@tensilica.com>
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*/
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#ifndef _XTENSA_INITIALIZE_MMU_H
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#define _XTENSA_INITIALIZE_MMU_H
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#include <asm/pgtable.h>
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#include <asm/vectors.h>
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#define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
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#define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
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#ifdef __ASSEMBLY__
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#define XTENSA_HWVERSION_RC_2009_0 230000
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.macro initialize_mmu
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#if XCHAL_HAVE_S32C1I && (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
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/*
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* We Have Atomic Operation Control (ATOMCTL) Register; Initialize it.
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* For details see Documentation/xtensa/atomctl.txt
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*/
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#if XCHAL_DCACHE_IS_COHERENT
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movi a3, 0x25 /* For SMP/MX -- internal for writeback,
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* RCW otherwise
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*/
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#else
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movi a3, 0x29 /* non-MX -- Most cores use Std Memory
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* Controlers which usually can't use RCW
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*/
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#endif
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wsr a3, atomctl
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#endif /* XCHAL_HAVE_S32C1I &&
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* (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
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*/
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#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
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/*
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* Have MMU v3
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*/
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#if !XCHAL_HAVE_VECBASE
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# error "MMU v3 requires reloc vectors"
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#endif
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movi a1, 0
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_call0 1f
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_j 2f
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.align 4
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1: movi a2, 0x10000000
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movi a3, 0x18000000
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add a2, a2, a0
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9: bgeu a2, a3, 9b /* PC is out of the expected range */
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/* Step 1: invalidate mapping at 0x40000000..0x5FFFFFFF. */
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movi a2, 0x40000006
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idtlb a2
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iitlb a2
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isync
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/* Step 2: map 0x40000000..0x47FFFFFF to paddr containing this code
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* and jump to the new mapping.
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*/
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srli a3, a0, 27
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slli a3, a3, 27
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addi a3, a3, CA_BYPASS
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addi a7, a2, -1
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wdtlb a3, a7
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witlb a3, a7
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isync
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slli a4, a0, 5
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srli a4, a4, 5
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addi a5, a2, -6
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add a4, a4, a5
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jx a4
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/* Step 3: unmap everything other than current area.
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* Start at 0x60000000, wrap around, and end with 0x20000000
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*/
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2: movi a4, 0x20000000
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add a5, a2, a4
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3: idtlb a5
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iitlb a5
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add a5, a5, a4
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bne a5, a2, 3b
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/* Step 4: Setup MMU with the old V2 mappings. */
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movi a6, 0x01000000
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wsr a6, ITLBCFG
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wsr a6, DTLBCFG
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isync
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movi a5, 0xd0000005
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movi a4, CA_WRITEBACK
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wdtlb a4, a5
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witlb a4, a5
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movi a5, 0xd8000005
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movi a4, CA_BYPASS
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wdtlb a4, a5
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witlb a4, a5
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movi a5, XCHAL_KIO_CACHED_VADDR + 6
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movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_WRITEBACK
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wdtlb a4, a5
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witlb a4, a5
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movi a5, XCHAL_KIO_BYPASS_VADDR + 6
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movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_BYPASS
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wdtlb a4, a5
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witlb a4, a5
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isync
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/* Jump to self, using MMU v2 mappings. */
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movi a4, 1f
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jx a4
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1:
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movi a2, VECBASE_RESET_VADDR
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wsr a2, vecbase
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/* Step 5: remove temporary mapping. */
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idtlb a7
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iitlb a7
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isync
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movi a0, 0
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wsr a0, ptevaddr
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rsync
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#endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU &&
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XCHAL_HAVE_SPANNING_WAY */
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.endm
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#endif /*__ASSEMBLY__*/
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#endif /* _XTENSA_INITIALIZE_MMU_H */
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