arch/powerpc/include/asm/nohash/32/mmu-8xx.h - linux - Git at Google

 /* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_POWERPC_MMU_8XX_H_
 #define _ASM_POWERPC_MMU_8XX_H_
 /*
  * PPC8xx support
  */

 /* Control/status registers for the MPC8xx.
  * A write operation to these registers causes serialized access.
  * During software tablewalk, the registers used perform mask/shift-add
  * operations when written/read.  A TLB entry is created when the Mx_RPN
  * is written, and the contents of several registers are used to
  * create the entry.
  */
 #define SPRN_MI_CTR	784	/* Instruction TLB control register */
 #define MI_GPM		0x80000000	/* Set domain manager mode */
 #define MI_PPM		0x40000000	/* Set subpage protection */
 #define MI_CIDEF	0x20000000	/* Set cache inhibit when MMU dis */
 #define MI_RSV4I	0x08000000	/* Reserve 4 TLB entries */
 #define MI_PPCS		0x02000000	/* Use MI_RPN prob/priv state */
 #define MI_IDXMASK	0x00001f00	/* TLB index to be loaded */
 #define MI_RESETVAL	0x00000000	/* Value of register at reset */

 /* These are the Ks and Kp from the PowerPC books.  For proper operation,
  * Ks = 0, Kp = 1.
  */
 #define SPRN_MI_AP	786
 #define MI_Ks		0x80000000	/* Should not be set */
 #define MI_Kp		0x40000000	/* Should always be set */

 /*
  * All pages' PP data bits are set to either 001 or 011 by copying _PAGE_EXEC
  * into bit 21 in the ITLBmiss handler (bit 21 is the middle bit), which means
  * respectively NA for All or X for Supervisor and no access for User.
  * Then we use the APG to say whether accesses are according to Page rules or
  * "all Supervisor" rules (Access to all)
  * Therefore, we define 2 APG groups. lsb is _PMD_USER
  * 0 => No user => 01 (all accesses performed according to page definition)
  * 1 => User => 00 (all accesses performed as supervisor iaw page definition)
  * We define all 16 groups so that all other bits of APG can take any value
  */
 #define MI_APG_INIT	0x44444444

 /* The effective page number register.  When read, contains the information
  * about the last instruction TLB miss.  When MI_RPN is written, bits in
  * this register are used to create the TLB entry.
  */
 #define SPRN_MI_EPN	787
 #define MI_EPNMASK	0xfffff000	/* Effective page number for entry */
 #define MI_EVALID	0x00000200	/* Entry is valid */
 #define MI_ASIDMASK	0x0000000f	/* ASID match value */
 					/* Reset value is undefined */

 /* A "level 1" or "segment" or whatever you want to call it register.
  * For the instruction TLB, it contains bits that get loaded into the
  * TLB entry when the MI_RPN is written.
  */
 #define SPRN_MI_TWC	789
 #define MI_APG		0x000001e0	/* Access protection group (0) */
 #define MI_GUARDED	0x00000010	/* Guarded storage */
 #define MI_PSMASK	0x0000000c	/* Mask of page size bits */
 #define MI_PS8MEG	0x0000000c	/* 8M page size */
 #define MI_PS512K	0x00000004	/* 512K page size */
 #define MI_PS4K_16K	0x00000000	/* 4K or 16K page size */
 #define MI_SVALID	0x00000001	/* Segment entry is valid */
 					/* Reset value is undefined */

 /* Real page number.  Defined by the pte.  Writing this register
  * causes a TLB entry to be created for the instruction TLB, using
  * additional information from the MI_EPN, and MI_TWC registers.
  */
 #define SPRN_MI_RPN	790
 #define MI_SPS16K	0x00000008	/* Small page size (0 = 4k, 1 = 16k) */

 /* Define an RPN value for mapping kernel memory to large virtual
  * pages for boot initialization.  This has real page number of 0,
  * large page size, shared page, cache enabled, and valid.
  * Also mark all subpages valid and write access.
  */
 #define MI_BOOTINIT	0x000001fd

 #define SPRN_MD_CTR	792	/* Data TLB control register */
 #define MD_GPM		0x80000000	/* Set domain manager mode */
 #define MD_PPM		0x40000000	/* Set subpage protection */
 #define MD_CIDEF	0x20000000	/* Set cache inhibit when MMU dis */
 #define MD_WTDEF	0x10000000	/* Set writethrough when MMU dis */
 #define MD_RSV4I	0x08000000	/* Reserve 4 TLB entries */
 #define MD_TWAM		0x04000000	/* Use 4K page hardware assist */
 #define MD_PPCS		0x02000000	/* Use MI_RPN prob/priv state */
 #define MD_IDXMASK	0x00001f00	/* TLB index to be loaded */
 #define MD_RESETVAL	0x04000000	/* Value of register at reset */

 #define SPRN_M_CASID	793	/* Address space ID (context) to match */
 #define MC_ASIDMASK	0x0000000f	/* Bits used for ASID value */


 /* These are the Ks and Kp from the PowerPC books.  For proper operation,
  * Ks = 0, Kp = 1.
  */
 #define SPRN_MD_AP	794
 #define MD_Ks		0x80000000	/* Should not be set */
 #define MD_Kp		0x40000000	/* Should always be set */

 /*
  * All pages' PP data bits are set to either 000 or 011 or 001, which means
  * respectively RW for Supervisor and no access for User, or RO for
  * Supervisor and no access for user and NA for ALL.
  * Then we use the APG to say whether accesses are according to Page rules or
  * "all Supervisor" rules (Access to all)
  * Therefore, we define 2 APG groups. lsb is _PMD_USER
  * 0 => No user => 01 (all accesses performed according to page definition)
  * 1 => User => 00 (all accesses performed as supervisor iaw page definition)
  * We define all 16 groups so that all other bits of APG can take any value
  */
 #define MD_APG_INIT	0x44444444

 /* The effective page number register.  When read, contains the information
  * about the last instruction TLB miss.  When MD_RPN is written, bits in
  * this register are used to create the TLB entry.
  */
 #define SPRN_MD_EPN	795
 #define MD_EPNMASK	0xfffff000	/* Effective page number for entry */
 #define MD_EVALID	0x00000200	/* Entry is valid */
 #define MD_ASIDMASK	0x0000000f	/* ASID match value */
 					/* Reset value is undefined */

 /* The pointer to the base address of the first level page table.
  * During a software tablewalk, reading this register provides the address
  * of the entry associated with MD_EPN.
  */
 #define SPRN_M_TWB	796
 #define	M_L1TB		0xfffff000	/* Level 1 table base address */
 #define M_L1INDX	0x00000ffc	/* Level 1 index, when read */
 					/* Reset value is undefined */

 /* A "level 1" or "segment" or whatever you want to call it register.
  * For the data TLB, it contains bits that get loaded into the TLB entry
  * when the MD_RPN is written.  It is also provides the hardware assist
  * for finding the PTE address during software tablewalk.
  */
 #define SPRN_MD_TWC	797
 #define MD_L2TB		0xfffff000	/* Level 2 table base address */
 #define MD_L2INDX	0xfffffe00	/* Level 2 index (*pte), when read */
 #define MD_APG		0x000001e0	/* Access protection group (0) */
 #define MD_GUARDED	0x00000010	/* Guarded storage */
 #define MD_PSMASK	0x0000000c	/* Mask of page size bits */
 #define MD_PS8MEG	0x0000000c	/* 8M page size */
 #define MD_PS512K	0x00000004	/* 512K page size */
 #define MD_PS4K_16K	0x00000000	/* 4K or 16K page size */
 #define MD_WT		0x00000002	/* Use writethrough page attribute */
 #define MD_SVALID	0x00000001	/* Segment entry is valid */
 					/* Reset value is undefined */


 /* Real page number.  Defined by the pte.  Writing this register
  * causes a TLB entry to be created for the data TLB, using
  * additional information from the MD_EPN, and MD_TWC registers.
  */
 #define SPRN_MD_RPN	798
 #define MD_SPS16K	0x00000008	/* Small page size (0 = 4k, 1 = 16k) */

 /* This is a temporary storage register that could be used to save
  * a processor working register during a tablewalk.
  */
 #define SPRN_M_TW	799

 #ifdef CONFIG_PPC_MM_SLICES
 #include <asm/nohash/32/slice.h>
 #define SLICE_ARRAY_SIZE	(1 << (32 - SLICE_LOW_SHIFT - 1))
 #endif

 #ifndef __ASSEMBLY__
 struct slice_mask {
 	u64 low_slices;
 	DECLARE_BITMAP(high_slices, 0);
 };

 typedef struct {
 	unsigned int id;
 	unsigned int active;
 	unsigned long vdso_base;
 #ifdef CONFIG_PPC_MM_SLICES
 	u16 user_psize;		/* page size index */
 	unsigned char low_slices_psize[SLICE_ARRAY_SIZE];
 	unsigned char high_slices_psize[0];
 	unsigned long slb_addr_limit;
 	struct slice_mask mask_base_psize; /* 4k or 16k */
 # ifdef CONFIG_HUGETLB_PAGE
 	struct slice_mask mask_512k;
 	struct slice_mask mask_8m;
 # endif
 #endif
 	void *pte_frag;
 } mm_context_t;

 #define PHYS_IMMR_BASE (mfspr(SPRN_IMMR) & 0xfff80000)
 #define VIRT_IMMR_BASE (__fix_to_virt(FIX_IMMR_BASE))

 /* Page size definitions, common between 32 and 64-bit
  *
  *    shift : is the "PAGE_SHIFT" value for that page size
  *    penc  : is the pte encoding mask
  *
  */
 struct mmu_psize_def {
 	unsigned int	shift;	/* number of bits */
 	unsigned int	enc;	/* PTE encoding */
 	unsigned int    ind;    /* Corresponding indirect page size shift */
 	unsigned int	flags;
 #define MMU_PAGE_SIZE_DIRECT	0x1	/* Supported as a direct size */
 #define MMU_PAGE_SIZE_INDIRECT	0x2	/* Supported as an indirect size */
 };

 extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];

 static inline int shift_to_mmu_psize(unsigned int shift)
 {
 	int psize;

 	for (psize = 0; psize < MMU_PAGE_COUNT; ++psize)
 		if (mmu_psize_defs[psize].shift == shift)
 			return psize;
 	return -1;
 }

 static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize)
 {
 	if (mmu_psize_defs[mmu_psize].shift)
 		return mmu_psize_defs[mmu_psize].shift;
 	BUG();
 }

 /* patch sites */
 extern s32 patch__itlbmiss_linmem_top;
 extern s32 patch__dtlbmiss_linmem_top, patch__dtlbmiss_immr_jmp;
 extern s32 patch__fixupdar_linmem_top;

 extern s32 patch__itlbmiss_exit_1, patch__itlbmiss_exit_2;
 extern s32 patch__dtlbmiss_exit_1, patch__dtlbmiss_exit_2, patch__dtlbmiss_exit_3;
 extern s32 patch__itlbmiss_perf, patch__dtlbmiss_perf;

 #endif /* !__ASSEMBLY__ */

 #if defined(CONFIG_PPC_4K_PAGES)
 #define mmu_virtual_psize	MMU_PAGE_4K
 #elif defined(CONFIG_PPC_16K_PAGES)
 #define mmu_virtual_psize	MMU_PAGE_16K
 #define PTE_FRAG_NR		4
 #define PTE_FRAG_SIZE_SHIFT	12
 #define PTE_FRAG_SIZE		(1UL << 12)
 #else
 #error "Unsupported PAGE_SIZE"
 #endif

 #define mmu_linear_psize	MMU_PAGE_8M

 #endif /* _ASM_POWERPC_MMU_8XX_H_ */
	/* SPDX-License-Identifier: GPL-2.0 */
	#ifndef _ASM_POWERPC_MMU_8XX_H_
	#define _ASM_POWERPC_MMU_8XX_H_
	/*
	* PPC8xx support
	*/

	/* Control/status registers for the MPC8xx.
	* A write operation to these registers causes serialized access.
	* During software tablewalk, the registers used perform mask/shift-add
	* operations when written/read. A TLB entry is created when the Mx_RPN
	* is written, and the contents of several registers are used to
	* create the entry.
	*/
	#define SPRN_MI_CTR 784 /* Instruction TLB control register */
	#define MI_GPM 0x80000000 /* Set domain manager mode */
	#define MI_PPM 0x40000000 /* Set subpage protection */
	#define MI_CIDEF 0x20000000 /* Set cache inhibit when MMU dis */
	#define MI_RSV4I 0x08000000 /* Reserve 4 TLB entries */
	#define MI_PPCS 0x02000000 /* Use MI_RPN prob/priv state */
	#define MI_IDXMASK 0x00001f00 /* TLB index to be loaded */
	#define MI_RESETVAL 0x00000000 /* Value of register at reset */

	/* These are the Ks and Kp from the PowerPC books. For proper operation,
	* Ks = 0, Kp = 1.
	*/
	#define SPRN_MI_AP 786
	#define MI_Ks 0x80000000 /* Should not be set */
	#define MI_Kp 0x40000000 /* Should always be set */

	/*
	* All pages' PP data bits are set to either 001 or 011 by copying _PAGE_EXEC
	* into bit 21 in the ITLBmiss handler (bit 21 is the middle bit), which means
	* respectively NA for All or X for Supervisor and no access for User.
	* Then we use the APG to say whether accesses are according to Page rules or
	* "all Supervisor" rules (Access to all)
	* Therefore, we define 2 APG groups. lsb is _PMD_USER
	* 0 => No user => 01 (all accesses performed according to page definition)
	* 1 => User => 00 (all accesses performed as supervisor iaw page definition)
	* We define all 16 groups so that all other bits of APG can take any value
	*/
	#define MI_APG_INIT 0x44444444

	/* The effective page number register. When read, contains the information
	* about the last instruction TLB miss. When MI_RPN is written, bits in
	* this register are used to create the TLB entry.
	*/
	#define SPRN_MI_EPN 787
	#define MI_EPNMASK 0xfffff000 /* Effective page number for entry */
	#define MI_EVALID 0x00000200 /* Entry is valid */
	#define MI_ASIDMASK 0x0000000f /* ASID match value */
	/* Reset value is undefined */

	/* A "level 1" or "segment" or whatever you want to call it register.
	* For the instruction TLB, it contains bits that get loaded into the
	* TLB entry when the MI_RPN is written.
	*/
	#define SPRN_MI_TWC 789
	#define MI_APG 0x000001e0 /* Access protection group (0) */
	#define MI_GUARDED 0x00000010 /* Guarded storage */
	#define MI_PSMASK 0x0000000c /* Mask of page size bits */
	#define MI_PS8MEG 0x0000000c /* 8M page size */
	#define MI_PS512K 0x00000004 /* 512K page size */
	#define MI_PS4K_16K 0x00000000 /* 4K or 16K page size */
	#define MI_SVALID 0x00000001 /* Segment entry is valid */
	/* Reset value is undefined */

	/* Real page number. Defined by the pte. Writing this register
	* causes a TLB entry to be created for the instruction TLB, using
	* additional information from the MI_EPN, and MI_TWC registers.
	*/
	#define SPRN_MI_RPN 790
	#define MI_SPS16K 0x00000008 /* Small page size (0 = 4k, 1 = 16k) */

	/* Define an RPN value for mapping kernel memory to large virtual
	* pages for boot initialization. This has real page number of 0,
	* large page size, shared page, cache enabled, and valid.
	* Also mark all subpages valid and write access.
	*/
	#define MI_BOOTINIT 0x000001fd

	#define SPRN_MD_CTR 792 /* Data TLB control register */
	#define MD_GPM 0x80000000 /* Set domain manager mode */
	#define MD_PPM 0x40000000 /* Set subpage protection */
	#define MD_CIDEF 0x20000000 /* Set cache inhibit when MMU dis */
	#define MD_WTDEF 0x10000000 /* Set writethrough when MMU dis */
	#define MD_RSV4I 0x08000000 /* Reserve 4 TLB entries */
	#define MD_TWAM 0x04000000 /* Use 4K page hardware assist */
	#define MD_PPCS 0x02000000 /* Use MI_RPN prob/priv state */
	#define MD_IDXMASK 0x00001f00 /* TLB index to be loaded */
	#define MD_RESETVAL 0x04000000 /* Value of register at reset */

	#define SPRN_M_CASID 793 /* Address space ID (context) to match */
	#define MC_ASIDMASK 0x0000000f /* Bits used for ASID value */


	/* These are the Ks and Kp from the PowerPC books. For proper operation,
	* Ks = 0, Kp = 1.
	*/
	#define SPRN_MD_AP 794
	#define MD_Ks 0x80000000 /* Should not be set */
	#define MD_Kp 0x40000000 /* Should always be set */

	/*
	* All pages' PP data bits are set to either 000 or 011 or 001, which means
	* respectively RW for Supervisor and no access for User, or RO for
	* Supervisor and no access for user and NA for ALL.
	* Then we use the APG to say whether accesses are according to Page rules or
	* "all Supervisor" rules (Access to all)
	* Therefore, we define 2 APG groups. lsb is _PMD_USER
	* 0 => No user => 01 (all accesses performed according to page definition)
	* 1 => User => 00 (all accesses performed as supervisor iaw page definition)
	* We define all 16 groups so that all other bits of APG can take any value
	*/
	#define MD_APG_INIT 0x44444444

	/* The effective page number register. When read, contains the information
	* about the last instruction TLB miss. When MD_RPN is written, bits in
	* this register are used to create the TLB entry.
	*/
	#define SPRN_MD_EPN 795
	#define MD_EPNMASK 0xfffff000 /* Effective page number for entry */
	#define MD_EVALID 0x00000200 /* Entry is valid */
	#define MD_ASIDMASK 0x0000000f /* ASID match value */
	/* Reset value is undefined */

	/* The pointer to the base address of the first level page table.
	* During a software tablewalk, reading this register provides the address
	* of the entry associated with MD_EPN.
	*/
	#define SPRN_M_TWB 796
	#define M_L1TB 0xfffff000 /* Level 1 table base address */
	#define M_L1INDX 0x00000ffc /* Level 1 index, when read */
	/* Reset value is undefined */

	/* A "level 1" or "segment" or whatever you want to call it register.
	* For the data TLB, it contains bits that get loaded into the TLB entry
	* when the MD_RPN is written. It is also provides the hardware assist
	* for finding the PTE address during software tablewalk.
	*/
	#define SPRN_MD_TWC 797
	#define MD_L2TB 0xfffff000 /* Level 2 table base address */
	#define MD_L2INDX 0xfffffe00 /* Level 2 index (pte), when read /
	#define MD_APG 0x000001e0 /* Access protection group (0) */
	#define MD_GUARDED 0x00000010 /* Guarded storage */
	#define MD_PSMASK 0x0000000c /* Mask of page size bits */
	#define MD_PS8MEG 0x0000000c /* 8M page size */
	#define MD_PS512K 0x00000004 /* 512K page size */
	#define MD_PS4K_16K 0x00000000 /* 4K or 16K page size */
	#define MD_WT 0x00000002 /* Use writethrough page attribute */
	#define MD_SVALID 0x00000001 /* Segment entry is valid */
	/* Reset value is undefined */


	/* Real page number. Defined by the pte. Writing this register
	* causes a TLB entry to be created for the data TLB, using
	* additional information from the MD_EPN, and MD_TWC registers.
	*/
	#define SPRN_MD_RPN 798
	#define MD_SPS16K 0x00000008 /* Small page size (0 = 4k, 1 = 16k) */

	/* This is a temporary storage register that could be used to save
	* a processor working register during a tablewalk.
	*/
	#define SPRN_M_TW 799

	#ifdef CONFIG_PPC_MM_SLICES
	#include <asm/nohash/32/slice.h>
	#define SLICE_ARRAY_SIZE (1 << (32 - SLICE_LOW_SHIFT - 1))
	#endif

	#ifndef __ASSEMBLY__
	struct slice_mask {
	u64 low_slices;
	DECLARE_BITMAP(high_slices, 0);
	};

	typedef struct {
	unsigned int id;
	unsigned int active;
	unsigned long vdso_base;
	#ifdef CONFIG_PPC_MM_SLICES
	u16 user_psize; /* page size index */
	unsigned char low_slices_psize[SLICE_ARRAY_SIZE];
	unsigned char high_slices_psize[0];
	unsigned long slb_addr_limit;
	struct slice_mask mask_base_psize; /* 4k or 16k */
	# ifdef CONFIG_HUGETLB_PAGE
	struct slice_mask mask_512k;
	struct slice_mask mask_8m;
	# endif
	#endif
	void *pte_frag;
	} mm_context_t;

	#define PHYS_IMMR_BASE (mfspr(SPRN_IMMR) & 0xfff80000)
	#define VIRT_IMMR_BASE (__fix_to_virt(FIX_IMMR_BASE))

	/* Page size definitions, common between 32 and 64-bit
	*
	* shift : is the "PAGE_SHIFT" value for that page size
	* penc : is the pte encoding mask
	*
	*/
	struct mmu_psize_def {
	unsigned int shift; /* number of bits */
	unsigned int enc; /* PTE encoding */
	unsigned int ind; /* Corresponding indirect page size shift */
	unsigned int flags;
	#define MMU_PAGE_SIZE_DIRECT 0x1 /* Supported as a direct size */
	#define MMU_PAGE_SIZE_INDIRECT 0x2 /* Supported as an indirect size */
	};

	extern struct mmu_psize_def mmu_psize_defs[MMU_PAGE_COUNT];

	static inline int shift_to_mmu_psize(unsigned int shift)
	{
	int psize;

	for (psize = 0; psize < MMU_PAGE_COUNT; ++psize)
	if (mmu_psize_defs[psize].shift == shift)
	return psize;
	return -1;
	}

	static inline unsigned int mmu_psize_to_shift(unsigned int mmu_psize)
	{
	if (mmu_psize_defs[mmu_psize].shift)
	return mmu_psize_defs[mmu_psize].shift;
	BUG();
	}

	/* patch sites */
	extern s32 patch__itlbmiss_linmem_top;
	extern s32 patch__dtlbmiss_linmem_top, patch__dtlbmiss_immr_jmp;
	extern s32 patch__fixupdar_linmem_top;

	extern s32 patch__itlbmiss_exit_1, patch__itlbmiss_exit_2;
	extern s32 patch__dtlbmiss_exit_1, patch__dtlbmiss_exit_2, patch__dtlbmiss_exit_3;
	extern s32 patch__itlbmiss_perf, patch__dtlbmiss_perf;

	#endif /* !__ASSEMBLY__ */

	#if defined(CONFIG_PPC_4K_PAGES)
	#define mmu_virtual_psize MMU_PAGE_4K
	#elif defined(CONFIG_PPC_16K_PAGES)
	#define mmu_virtual_psize MMU_PAGE_16K
	#define PTE_FRAG_NR 4
	#define PTE_FRAG_SIZE_SHIFT 12
	#define PTE_FRAG_SIZE (1UL << 12)
	#else
	#error "Unsupported PAGE_SIZE"
	#endif

	#define mmu_linear_psize MMU_PAGE_8M

	#endif /* _ASM_POWERPC_MMU_8XX_H_ */