linux-zen-desktop/arch/xtensa/include/asm/initialize_mmu.h

/*
 * 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.
 *
 *      For 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 <linux/init.h>
#include <linux/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

#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/arch/xtensa/atomctl.rst
 */
#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:

#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 */

	.endm

	.macro	initialize_cacheattr

#if !defined(CONFIG_MMU) && (XCHAL_HAVE_TLBS || XCHAL_HAVE_MPU)
#if CONFIG_MEMMAP_CACHEATTR == 0x22222222 && XCHAL_HAVE_PTP_MMU
#error Default MEMMAP_CACHEATTR of 0x22222222 does not work with full MMU.
#endif

#if XCHAL_HAVE_MPU
	__REFCONST
	.align	4
.Lattribute_table:
	.long 0x000000, 0x1fff00, 0x1ddf00, 0x1eef00
	.long 0x006600, 0x000000, 0x000000, 0x000000
	.long 0x000000, 0x000000, 0x000000, 0x000000
	.long 0x000000, 0x000000, 0x000000, 0x000000
	.previous

	movi	a3, .Lattribute_table
	movi	a4, CONFIG_MEMMAP_CACHEATTR
	movi	a5, 1
	movi	a6, XCHAL_MPU_ENTRIES
	movi	a10, 0x20000000
	movi	a11, -1
1:
	sub	a5, a5, a10
	extui	a8, a4, 28, 4
	beq	a8, a11, 2f
	addi	a6, a6, -1
	mov	a11, a8
2:
	addx4	a9, a8, a3
	l32i	a9, a9, 0
	or	a9, a9, a6
	wptlb	a9, a5
	slli	a4, a4, 4
	bgeu	a5, a10, 1b

#else
	movi	a5, XCHAL_SPANNING_WAY
	movi	a6, ~_PAGE_ATTRIB_MASK
	movi	a4, CONFIG_MEMMAP_CACHEATTR
	movi	a8, 0x20000000
1:
	rdtlb1	a3, a5
	xor	a3, a3, a4
	and	a3, a3, a6
	xor	a3, a3, a4
	wdtlb	a3, a5
	ritlb1	a3, a5
	xor	a3, a3, a4
	and	a3, a3, a6
	xor	a3, a3, a4
	witlb	a3, a5

	add	a5, a5, a8
	srli	a4, a4, 4
	bgeu	a5, a8, 1b

	isync
#endif
#endif

	.endm

#endif /*__ASSEMBLY__*/

#endif /* _XTENSA_INITIALIZE_MMU_H */