forked from Minki/linux
a9f2fc628e
Make kernel load address explicit, independent of the selected MMU configuration and configurable from Kconfig. Do not restrict it to the first 512MB of the physical address space. Cleanup kernel memory layout macros: - rename VECBASE_RESET_VADDR to VECBASE_VADDR, XC_VADDR to VECTOR_VADDR; - drop VIRTUAL_MEMORY_ADDRESS and LOAD_MEMORY_ADDRESS; - introduce PHYS_OFFSET and use it in __va and __pa definitions; - synchronize MMU/noMMU vectors, drop unused NMI vector; - replace hardcoded vectors offset of 0x3000 with Kconfig symbol. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
217 lines
4.6 KiB
C
217 lines
4.6 KiB
C
/*
|
|
* arch/xtensa/include/asm/initialize_mmu.h
|
|
*
|
|
* Initializes MMU:
|
|
*
|
|
* For the new V3 MMU we remap the TLB from virtual == physical
|
|
* to the standard Linux mapping used in earlier MMU's.
|
|
*
|
|
* The the MMU we also support a new configuration register that
|
|
* specifies how the S32C1I instruction operates with the cache
|
|
* controller.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General
|
|
* Public License. See the file "COPYING" in the main directory of
|
|
* this archive for more details.
|
|
*
|
|
* Copyright (C) 2008 - 2012 Tensilica, Inc.
|
|
*
|
|
* Marc Gauthier <marc@tensilica.com>
|
|
* Pete Delaney <piet@tensilica.com>
|
|
*/
|
|
|
|
#ifndef _XTENSA_INITIALIZE_MMU_H
|
|
#define _XTENSA_INITIALIZE_MMU_H
|
|
|
|
#include <asm/pgtable.h>
|
|
#include <asm/vectors.h>
|
|
|
|
#if XCHAL_HAVE_PTP_MMU
|
|
#define CA_BYPASS (_PAGE_CA_BYPASS | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
|
|
#define CA_WRITEBACK (_PAGE_CA_WB | _PAGE_HW_WRITE | _PAGE_HW_EXEC)
|
|
#else
|
|
#define CA_WRITEBACK (0x4)
|
|
#endif
|
|
|
|
#ifndef XCHAL_SPANNING_WAY
|
|
#define XCHAL_SPANNING_WAY 0
|
|
#endif
|
|
|
|
#ifdef __ASSEMBLY__
|
|
|
|
#define XTENSA_HWVERSION_RC_2009_0 230000
|
|
|
|
.macro initialize_mmu
|
|
|
|
#if XCHAL_HAVE_S32C1I && (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
|
|
/*
|
|
* We Have Atomic Operation Control (ATOMCTL) Register; Initialize it.
|
|
* For details see Documentation/xtensa/atomctl.txt
|
|
*/
|
|
#if XCHAL_DCACHE_IS_COHERENT
|
|
movi a3, 0x25 /* For SMP/MX -- internal for writeback,
|
|
* RCW otherwise
|
|
*/
|
|
#else
|
|
movi a3, 0x29 /* non-MX -- Most cores use Std Memory
|
|
* Controlers which usually can't use RCW
|
|
*/
|
|
#endif
|
|
wsr a3, atomctl
|
|
#endif /* XCHAL_HAVE_S32C1I &&
|
|
* (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
|
|
*/
|
|
|
|
#if defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
|
|
/*
|
|
* Have MMU v3
|
|
*/
|
|
|
|
#if !XCHAL_HAVE_VECBASE
|
|
# error "MMU v3 requires reloc vectors"
|
|
#endif
|
|
|
|
movi a1, 0
|
|
_call0 1f
|
|
_j 2f
|
|
|
|
.align 4
|
|
1: movi a2, 0x10000000
|
|
|
|
#if CONFIG_KERNEL_LOAD_ADDRESS < 0x40000000ul
|
|
#define TEMP_MAPPING_VADDR 0x40000000
|
|
#else
|
|
#define TEMP_MAPPING_VADDR 0x00000000
|
|
#endif
|
|
|
|
/* Step 1: invalidate mapping at 0x40000000..0x5FFFFFFF. */
|
|
|
|
movi a2, TEMP_MAPPING_VADDR | XCHAL_SPANNING_WAY
|
|
idtlb a2
|
|
iitlb a2
|
|
isync
|
|
|
|
/* Step 2: map 0x40000000..0x47FFFFFF to paddr containing this code
|
|
* and jump to the new mapping.
|
|
*/
|
|
|
|
srli a3, a0, 27
|
|
slli a3, a3, 27
|
|
addi a3, a3, CA_BYPASS
|
|
addi a7, a2, 5 - XCHAL_SPANNING_WAY
|
|
wdtlb a3, a7
|
|
witlb a3, a7
|
|
isync
|
|
|
|
slli a4, a0, 5
|
|
srli a4, a4, 5
|
|
addi a5, a2, -XCHAL_SPANNING_WAY
|
|
add a4, a4, a5
|
|
jx a4
|
|
|
|
/* Step 3: unmap everything other than current area.
|
|
* Start at 0x60000000, wrap around, and end with 0x20000000
|
|
*/
|
|
2: movi a4, 0x20000000
|
|
add a5, a2, a4
|
|
3: idtlb a5
|
|
iitlb a5
|
|
add a5, a5, a4
|
|
bne a5, a2, 3b
|
|
|
|
/* Step 4: Setup MMU with the requested static mappings. */
|
|
|
|
movi a6, 0x01000000
|
|
wsr a6, ITLBCFG
|
|
wsr a6, DTLBCFG
|
|
isync
|
|
|
|
movi a5, XCHAL_KSEG_CACHED_VADDR + XCHAL_KSEG_TLB_WAY
|
|
movi a4, XCHAL_KSEG_PADDR + CA_WRITEBACK
|
|
wdtlb a4, a5
|
|
witlb a4, a5
|
|
|
|
movi a5, XCHAL_KSEG_BYPASS_VADDR + XCHAL_KSEG_TLB_WAY
|
|
movi a4, XCHAL_KSEG_PADDR + CA_BYPASS
|
|
wdtlb a4, a5
|
|
witlb a4, a5
|
|
|
|
#ifdef CONFIG_XTENSA_KSEG_512M
|
|
movi a5, XCHAL_KSEG_CACHED_VADDR + 0x10000000 + XCHAL_KSEG_TLB_WAY
|
|
movi a4, XCHAL_KSEG_PADDR + 0x10000000 + CA_WRITEBACK
|
|
wdtlb a4, a5
|
|
witlb a4, a5
|
|
|
|
movi a5, XCHAL_KSEG_BYPASS_VADDR + 0x10000000 + XCHAL_KSEG_TLB_WAY
|
|
movi a4, XCHAL_KSEG_PADDR + 0x10000000 + CA_BYPASS
|
|
wdtlb a4, a5
|
|
witlb a4, a5
|
|
#endif
|
|
|
|
movi a5, XCHAL_KIO_CACHED_VADDR + XCHAL_KIO_TLB_WAY
|
|
movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_WRITEBACK
|
|
wdtlb a4, a5
|
|
witlb a4, a5
|
|
|
|
movi a5, XCHAL_KIO_BYPASS_VADDR + XCHAL_KIO_TLB_WAY
|
|
movi a4, XCHAL_KIO_DEFAULT_PADDR + CA_BYPASS
|
|
wdtlb a4, a5
|
|
witlb a4, a5
|
|
|
|
isync
|
|
|
|
/* Jump to self, using final mappings. */
|
|
movi a4, 1f
|
|
jx a4
|
|
|
|
1:
|
|
/* Step 5: remove temporary mapping. */
|
|
idtlb a7
|
|
iitlb a7
|
|
isync
|
|
|
|
movi a0, 0
|
|
wsr a0, ptevaddr
|
|
rsync
|
|
|
|
#endif /* defined(CONFIG_MMU) && XCHAL_HAVE_PTP_MMU &&
|
|
XCHAL_HAVE_SPANNING_WAY */
|
|
|
|
#if !defined(CONFIG_MMU) && XCHAL_HAVE_TLBS && \
|
|
(XCHAL_DCACHE_SIZE || XCHAL_ICACHE_SIZE)
|
|
/* Enable data and instruction cache in the DEFAULT_MEMORY region
|
|
* if the processor has DTLB and ITLB.
|
|
*/
|
|
|
|
movi a5, PLATFORM_DEFAULT_MEM_START | XCHAL_SPANNING_WAY
|
|
movi a6, ~_PAGE_ATTRIB_MASK
|
|
movi a7, CA_WRITEBACK
|
|
movi a8, 0x20000000
|
|
movi a9, PLATFORM_DEFAULT_MEM_SIZE
|
|
j 2f
|
|
1:
|
|
sub a9, a9, a8
|
|
2:
|
|
#if XCHAL_DCACHE_SIZE
|
|
rdtlb1 a3, a5
|
|
and a3, a3, a6
|
|
or a3, a3, a7
|
|
wdtlb a3, a5
|
|
#endif
|
|
#if XCHAL_ICACHE_SIZE
|
|
ritlb1 a4, a5
|
|
and a4, a4, a6
|
|
or a4, a4, a7
|
|
witlb a4, a5
|
|
#endif
|
|
add a5, a5, a8
|
|
bltu a8, a9, 1b
|
|
|
|
#endif
|
|
|
|
.endm
|
|
|
|
#endif /*__ASSEMBLY__*/
|
|
|
|
#endif /* _XTENSA_INITIALIZE_MMU_H */
|