Resguardo inicial

linux-7.2.3/arch/powerpc/include/asm/nohash/32/hugetlb-8xx.h

@@ -0,0 +1,60 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H
+#define _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H
+
+#define PAGE_SHIFT_8M		23
+
+static inline void flush_hugetlb_page(struct vm_area_struct *vma,
+				      unsigned long vmaddr)
+{
+	flush_tlb_page(vma, vmaddr);
+}
+
+static inline int check_and_get_huge_psize(int shift)
+{
+	return shift_to_mmu_psize(shift);
+}
+
+#define __HAVE_ARCH_HUGE_SET_HUGE_PTE_AT
+void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
+		     pte_t pte, unsigned long sz);
+
+#define __HAVE_ARCH_HUGE_PTEP_GET
+static inline pte_t huge_ptep_get(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	if (ptep_is_8m_pmdp(mm, addr, ptep))
+		ptep = pte_offset_kernel((pmd_t *)ptep, ALIGN_DOWN(addr, SZ_8M));
+	return ptep_get(ptep);
+}
+
+#define __HAVE_ARCH_HUGE_PTE_CLEAR
+static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
+				  pte_t *ptep, unsigned long sz)
+{
+	pte_update(mm, addr, ptep, ~0UL, 0, 1);
+}
+
+#define __HAVE_ARCH_HUGE_PTEP_SET_WRPROTECT
+static inline void huge_ptep_set_wrprotect(struct mm_struct *mm,
+					   unsigned long addr, pte_t *ptep)
+{
+	unsigned long clr = ~pte_val(pte_wrprotect(__pte(~0)));
+	unsigned long set = pte_val(pte_wrprotect(__pte(0)));
+
+	pte_update(mm, addr, ptep, clr, set, 1);
+}
+
+#ifdef CONFIG_PPC_4K_PAGES
+static inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
+{
+	size_t size = 1UL << shift;
+
+	if (size == SZ_16K)
+		return __pte(pte_val(entry) | _PAGE_SPS);
+	else
+		return __pte(pte_val(entry) | _PAGE_SPS | _PAGE_HUGE);
+}
+#define arch_make_huge_pte arch_make_huge_pte
+#endif
+
+#endif /* _ASM_POWERPC_NOHASH_32_HUGETLB_8XX_H */

linux-7.2.3/arch/powerpc/include/asm/nohash/32/kup-8xx.h

@@ -0,0 +1,88 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_KUP_8XX_H_
+#define _ASM_POWERPC_KUP_8XX_H_
+
+#include <asm/bug.h>
+#include <asm/mmu.h>
+
+#ifdef CONFIG_PPC_KUAP
+
+#ifndef __ASSEMBLER__
+
+#include <asm/reg.h>
+
+static __always_inline void __kuap_save_and_lock(struct pt_regs *regs)
+{
+	regs->kuap = mfspr(SPRN_MD_AP);
+	mtspr(SPRN_MD_AP, MD_APG_KUAP);
+}
+#define __kuap_save_and_lock __kuap_save_and_lock
+
+static __always_inline void kuap_user_restore(struct pt_regs *regs)
+{
+}
+
+static __always_inline void __kuap_kernel_restore(struct pt_regs *regs, unsigned long kuap)
+{
+	mtspr(SPRN_MD_AP, regs->kuap);
+}
+
+#ifdef CONFIG_PPC_KUAP_DEBUG
+static __always_inline unsigned long __kuap_get_and_assert_locked(void)
+{
+	WARN_ON_ONCE(mfspr(SPRN_MD_AP) >> 16 != MD_APG_KUAP >> 16);
+
+	return 0;
+}
+#define __kuap_get_and_assert_locked __kuap_get_and_assert_locked
+#endif
+
+static __always_inline void uaccess_begin_8xx(unsigned long val)
+{
+	asm(ASM_MMU_FTR_IFSET("mtspr %0, %1", "", %2) : :
+	    "i"(SPRN_MD_AP), "r"(val), "i"(MMU_FTR_KUAP) : "memory");
+}
+
+static __always_inline void uaccess_end_8xx(void)
+{
+	asm(ASM_MMU_FTR_IFSET("mtspr %0, %1", "", %2) : :
+	    "i"(SPRN_MD_AP), "r"(MD_APG_KUAP), "i"(MMU_FTR_KUAP) : "memory");
+}
+
+static __always_inline void allow_user_access(void __user *to, unsigned long dir)
+{
+	uaccess_begin_8xx(MD_APG_INIT);
+}
+
+static __always_inline void prevent_user_access(unsigned long dir)
+{
+	uaccess_end_8xx();
+}
+
+static __always_inline unsigned long prevent_user_access_return(void)
+{
+	unsigned long flags;
+
+	flags = mfspr(SPRN_MD_AP);
+
+	uaccess_end_8xx();
+
+	return flags;
+}
+
+static __always_inline void restore_user_access(unsigned long flags)
+{
+	uaccess_begin_8xx(flags);
+}
+
+static __always_inline bool
+__bad_kuap_fault(struct pt_regs *regs, unsigned long address, bool is_write)
+{
+	return !((regs->kuap ^ MD_APG_KUAP) & 0xff000000);
+}
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* CONFIG_PPC_KUAP */
+
+#endif /* _ASM_POWERPC_KUP_8XX_H_ */

linux-7.2.3/arch/powerpc/include/asm/nohash/32/mmu-44x.h

@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_MMU_44X_H_
+#define _ASM_POWERPC_MMU_44X_H_
+/*
+ * PPC440 support
+ */
+
+#include <asm/asm-const.h>
+
+#define PPC44x_MMUCR_TID	0x000000ff
+#define PPC44x_MMUCR_STS	0x00010000
+
+#define	PPC44x_TLB_PAGEID	0
+#define	PPC44x_TLB_XLAT		1
+#define	PPC44x_TLB_ATTRIB	2
+
+/* Page identification fields */
+#define PPC44x_TLB_EPN_MASK	0xfffffc00      /* Effective Page Number */
+#define	PPC44x_TLB_VALID	0x00000200      /* Valid flag */
+#define PPC44x_TLB_TS		0x00000100	/* Translation address space */
+#define PPC44x_TLB_1K		0x00000000	/* Page sizes */
+#define PPC44x_TLB_4K		0x00000010
+#define PPC44x_TLB_16K		0x00000020
+#define PPC44x_TLB_64K		0x00000030
+#define PPC44x_TLB_256K		0x00000040
+#define PPC44x_TLB_1M		0x00000050
+#define PPC44x_TLB_16M		0x00000070
+#define	PPC44x_TLB_256M		0x00000090
+
+/* Translation fields */
+#define PPC44x_TLB_RPN_MASK	0xfffffc00      /* Real Page Number */
+#define	PPC44x_TLB_ERPN_MASK	0x0000000f
+
+/* Storage attribute and access control fields */
+#define PPC44x_TLB_ATTR_MASK	0x0000ff80
+#define PPC44x_TLB_U0		0x00008000      /* User 0 */
+#define PPC44x_TLB_U1		0x00004000      /* User 1 */
+#define PPC44x_TLB_U2		0x00002000      /* User 2 */
+#define PPC44x_TLB_U3		0x00001000      /* User 3 */
+#define PPC44x_TLB_W		0x00000800      /* Caching is write-through */
+#define PPC44x_TLB_I		0x00000400      /* Caching is inhibited */
+#define PPC44x_TLB_M		0x00000200      /* Memory is coherent */
+#define PPC44x_TLB_G		0x00000100      /* Memory is guarded */
+#define PPC44x_TLB_E		0x00000080      /* Memory is little endian */
+
+#define PPC44x_TLB_PERM_MASK	0x0000003f
+#define PPC44x_TLB_UX		0x00000020      /* User execution */
+#define PPC44x_TLB_UW		0x00000010      /* User write */
+#define PPC44x_TLB_UR		0x00000008      /* User read */
+#define PPC44x_TLB_SX		0x00000004      /* Super execution */
+#define PPC44x_TLB_SW		0x00000002      /* Super write */
+#define PPC44x_TLB_SR		0x00000001      /* Super read */
+
+/* Number of TLB entries */
+#define PPC44x_TLB_SIZE		64
+
+/* 47x bits */
+#define PPC47x_MMUCR_TID	0x0000ffff
+#define PPC47x_MMUCR_STS	0x00010000
+
+/* Page identification fields */
+#define PPC47x_TLB0_EPN_MASK	0xfffff000      /* Effective Page Number */
+#define PPC47x_TLB0_VALID	0x00000800      /* Valid flag */
+#define PPC47x_TLB0_TS		0x00000400	/* Translation address space */
+#define PPC47x_TLB0_4K		0x00000000
+#define PPC47x_TLB0_16K		0x00000010
+#define PPC47x_TLB0_64K		0x00000030
+#define PPC47x_TLB0_1M		0x00000070
+#define PPC47x_TLB0_16M		0x000000f0
+#define PPC47x_TLB0_256M	0x000001f0
+#define PPC47x_TLB0_1G		0x000003f0
+#define PPC47x_TLB0_BOLTED_R	0x00000008	/* tlbre only */
+
+/* Translation fields */
+#define PPC47x_TLB1_RPN_MASK	0xfffff000      /* Real Page Number */
+#define PPC47x_TLB1_ERPN_MASK	0x000003ff
+
+/* Storage attribute and access control fields */
+#define PPC47x_TLB2_ATTR_MASK	0x0003ff80
+#define PPC47x_TLB2_IL1I	0x00020000      /* Memory is guarded */
+#define PPC47x_TLB2_IL1D	0x00010000      /* Memory is guarded */
+#define PPC47x_TLB2_U0		0x00008000      /* User 0 */
+#define PPC47x_TLB2_U1		0x00004000      /* User 1 */
+#define PPC47x_TLB2_U2		0x00002000      /* User 2 */
+#define PPC47x_TLB2_U3		0x00001000      /* User 3 */
+#define PPC47x_TLB2_W		0x00000800      /* Caching is write-through */
+#define PPC47x_TLB2_I		0x00000400      /* Caching is inhibited */
+#define PPC47x_TLB2_M		0x00000200      /* Memory is coherent */
+#define PPC47x_TLB2_G		0x00000100      /* Memory is guarded */
+#define PPC47x_TLB2_E		0x00000080      /* Memory is little endian */
+#define PPC47x_TLB2_PERM_MASK	0x0000003f
+#define PPC47x_TLB2_UX		0x00000020      /* User execution */
+#define PPC47x_TLB2_UW		0x00000010      /* User write */
+#define PPC47x_TLB2_UR		0x00000008      /* User read */
+#define PPC47x_TLB2_SX		0x00000004      /* Super execution */
+#define PPC47x_TLB2_SW		0x00000002      /* Super write */
+#define PPC47x_TLB2_SR		0x00000001      /* Super read */
+#define PPC47x_TLB2_U_RWX	(PPC47x_TLB2_UX|PPC47x_TLB2_UW|PPC47x_TLB2_UR)
+#define PPC47x_TLB2_S_RWX	(PPC47x_TLB2_SX|PPC47x_TLB2_SW|PPC47x_TLB2_SR)
+#define PPC47x_TLB2_S_RW	(PPC47x_TLB2_SW | PPC47x_TLB2_SR)
+#define PPC47x_TLB2_IMG		(PPC47x_TLB2_I | PPC47x_TLB2_M | PPC47x_TLB2_G)
+
+#ifndef __ASSEMBLER__
+
+extern unsigned int tlb_44x_hwater;
+extern unsigned int tlb_44x_index;
+
+typedef struct {
+	unsigned int	id;
+	unsigned int	active;
+	void __user	*vdso;
+} mm_context_t;
+
+/* patch sites */
+extern s32 patch__tlb_44x_hwater_D, patch__tlb_44x_hwater_I;
+
+#endif /* !__ASSEMBLER__ */
+
+#ifndef CONFIG_PPC_EARLY_DEBUG_44x
+#define PPC44x_EARLY_TLBS	1
+#else
+#define PPC44x_EARLY_TLBS	2
+#define PPC44x_EARLY_DEBUG_VIRTADDR	(ASM_CONST(0xf0000000) \
+	| (ASM_CONST(CONFIG_PPC_EARLY_DEBUG_44x_PHYSLOW) & 0xffff))
+#endif
+
+/* Size of the TLBs used for pinning in lowmem */
+#define PPC_PIN_SIZE	(1 << 28)	/* 256M */
+
+#if defined(CONFIG_PPC_4K_PAGES)
+#define PPC44x_TLBE_SIZE	PPC44x_TLB_4K
+#define PPC47x_TLBE_SIZE	PPC47x_TLB0_4K
+#define mmu_virtual_psize	MMU_PAGE_4K
+#elif defined(CONFIG_PPC_16K_PAGES)
+#define PPC44x_TLBE_SIZE	PPC44x_TLB_16K
+#define PPC47x_TLBE_SIZE	PPC47x_TLB0_16K
+#define mmu_virtual_psize	MMU_PAGE_16K
+#elif defined(CONFIG_PPC_64K_PAGES)
+#define PPC44x_TLBE_SIZE	PPC44x_TLB_64K
+#define PPC47x_TLBE_SIZE	PPC47x_TLB0_64K
+#define mmu_virtual_psize	MMU_PAGE_64K
+#elif defined(CONFIG_PPC_256K_PAGES)
+#define PPC44x_TLBE_SIZE	PPC44x_TLB_256K
+#define mmu_virtual_psize	MMU_PAGE_256K
+#else
+#error "Unsupported PAGE_SIZE"
+#endif
+
+#define mmu_linear_psize	MMU_PAGE_256M
+
+#define PPC44x_PGD_OFF_SHIFT	(32 - PGDIR_SHIFT + PGD_T_LOG2)
+#define PPC44x_PGD_OFF_MASK_BIT	(PGDIR_SHIFT - PGD_T_LOG2)
+#define PPC44x_PTE_ADD_SHIFT	(32 - PGDIR_SHIFT + PTE_SHIFT + PTE_T_LOG2)
+#define PPC44x_PTE_ADD_MASK_BIT	(32 - PTE_T_LOG2 - PTE_SHIFT)
+
+#endif /* _ASM_POWERPC_MMU_44X_H_ */

linux-7.2.3/arch/powerpc/include/asm/nohash/32/mmu-8xx.h

@@ -0,0 +1,266 @@
+/* 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 */
+
+/* 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)
+ * _PAGE_ACCESSED is also managed via APG. When _PAGE_ACCESSED is not set, say
+ * "all User" rules, that will lead to NA for all.
+ * Therefore, we define 4 APG groups. lsb is _PAGE_ACCESSED
+ * 0 => Kernel => 11 (all accesses performed according as user iaw page definition)
+ * 1 => Kernel+Accessed => 01 (all accesses performed according to page definition)
+ * 2 => User => 11 (all accesses performed according as user iaw page definition)
+ * 3 => User+Accessed => 10 (all accesses performed according to swaped page definition) for KUEP
+ * 4-15 => Not Used
+ */
+#define MI_APG_INIT	0xde000000
+
+/* 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 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 */
+
+/* See explanation above at the definition of MI_APG_INIT */
+#define MD_APG_INIT	0xdc000000
+#define MD_APG_KUAP	0xde000000
+
+/* 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
+
+#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
+
+#ifndef __ASSEMBLER__
+
+#include <linux/mmdebug.h>
+#include <linux/sizes.h>
+
+void mmu_pin_tlb(unsigned long top, bool readonly);
+
+typedef struct {
+	unsigned int id;
+	unsigned int active;
+	void __user *vdso;
+	void *pte_frag;
+} mm_context_t;
+
+#define PHYS_IMMR_BASE (mfspr(SPRN_IMMR) & 0xfff80000)
+
+/*
+ * Page size definitions for 8xx
+ *
+ *    shift : is the "PAGE_SHIFT" value for that page size
+ *
+ */
+struct mmu_psize_def {
+	unsigned int	shift;	/* number of bits */
+};
+
+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();
+}
+
+static inline bool arch_vmap_try_size(unsigned long addr, unsigned long end, u64 pfn,
+				      unsigned int max_page_shift, unsigned long size)
+{
+	if (end - addr < size)
+		return false;
+
+	if ((1UL << max_page_shift) < size)
+		return false;
+
+	if (!IS_ALIGNED(addr, size))
+		return false;
+
+	if (!IS_ALIGNED(PFN_PHYS(pfn), size))
+		return false;
+
+	return true;
+}
+
+static inline unsigned long arch_vmap_pte_range_map_size(unsigned long addr, unsigned long end,
+							 u64 pfn, unsigned int max_page_shift)
+{
+	if (arch_vmap_try_size(addr, end, pfn, max_page_shift, SZ_512K))
+		return SZ_512K;
+	if (PAGE_SIZE == SZ_16K)
+		return SZ_16K;
+	if (arch_vmap_try_size(addr, end, pfn, max_page_shift, SZ_16K))
+		return SZ_16K;
+	return PAGE_SIZE;
+}
+#define arch_vmap_pte_range_map_size arch_vmap_pte_range_map_size
+
+static inline int arch_vmap_pte_supported_shift(unsigned long size)
+{
+	if (size >= SZ_512K)
+		return 19;
+	else if (size >= SZ_16K)
+		return 14;
+	else
+		return PAGE_SHIFT;
+}
+#define arch_vmap_pte_supported_shift arch_vmap_pte_supported_shift
+
+/* patch sites */
+extern s32 patch__itlbmiss_exit_1, patch__dtlbmiss_exit_1;
+extern s32 patch__itlbmiss_perf, patch__dtlbmiss_perf;
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* _ASM_POWERPC_MMU_8XX_H_ */

linux-7.2.3/arch/powerpc/include/asm/nohash/32/pgalloc.h

@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_PGALLOC_32_H
+#define _ASM_POWERPC_PGALLOC_32_H
+
+#include <linux/threads.h>
+#include <linux/slab.h>
+
+/*
+ * We don't have any real pmd's, and this code never triggers because
+ * the pgd will always be present..
+ */
+/* #define pmd_alloc_one(mm,address)       ({ BUG(); ((pmd_t *)2); }) */
+#define pmd_free(mm, x) 		do { } while (0)
+#define __pmd_free_tlb(tlb,x,a)		do { } while (0)
+/* #define pgd_populate(mm, pmd, pte)      BUG() */
+
+static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp,
+				       pte_t *pte)
+{
+	if (IS_ENABLED(CONFIG_BOOKE))
+		*pmdp = __pmd((unsigned long)pte | _PMD_PRESENT);
+	else
+		*pmdp = __pmd(__pa(pte) | _PMD_PRESENT);
+}
+
+static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmdp,
+				pgtable_t pte_page)
+{
+	if (IS_ENABLED(CONFIG_BOOKE))
+		*pmdp = __pmd((unsigned long)pte_page | _PMD_PRESENT);
+	else
+		*pmdp = __pmd(__pa(pte_page) | _PMD_USER | _PMD_PRESENT);
+}
+
+#endif /* _ASM_POWERPC_PGALLOC_32_H */

linux-7.2.3/arch/powerpc/include/asm/nohash/32/pgtable.h

@@ -0,0 +1,202 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_NOHASH_32_PGTABLE_H
+#define _ASM_POWERPC_NOHASH_32_PGTABLE_H
+
+#include <asm-generic/pgtable-nopmd.h>
+
+#ifndef __ASSEMBLER__
+#include <linux/sched.h>
+#include <linux/threads.h>
+#include <asm/mmu.h>			/* For sub-arch specific PPC_PIN_SIZE */
+
+#endif /* __ASSEMBLER__ */
+
+#define PTE_INDEX_SIZE	PTE_SHIFT
+#define PMD_INDEX_SIZE	0
+#define PUD_INDEX_SIZE	0
+#define PGD_INDEX_SIZE	(32 - PGDIR_SHIFT)
+
+#define PMD_CACHE_INDEX	PMD_INDEX_SIZE
+#define PUD_CACHE_INDEX	PUD_INDEX_SIZE
+
+#ifndef __ASSEMBLER__
+#define PTE_TABLE_SIZE	(sizeof(pte_t) << PTE_INDEX_SIZE)
+#define PMD_TABLE_SIZE	0
+#define PUD_TABLE_SIZE	0
+#define PGD_TABLE_SIZE	(sizeof(pgd_t) << PGD_INDEX_SIZE)
+
+#define PMD_MASKED_BITS (PTE_TABLE_SIZE - 1)
+#endif	/* __ASSEMBLER__ */
+
+#define PTRS_PER_PTE	(1 << PTE_INDEX_SIZE)
+#define PTRS_PER_PGD	(1 << PGD_INDEX_SIZE)
+
+/*
+ * The normal case is that PTEs are 32-bits and we have a 1-page
+ * 1024-entry pgdir pointing to 1-page 1024-entry PTE pages.  -- paulus
+ *
+ * For any >32-bit physical address platform, we can use the following
+ * two level page table layout where the pgdir is 8KB and the MS 13 bits
+ * are an index to the second level table.  The combined pgdir/pmd first
+ * level has 2048 entries and the second level has 512 64-bit PTE entries.
+ * -Matt
+ */
+/* PGDIR_SHIFT determines what a top-level page table entry can map */
+#define PGDIR_SHIFT	(PAGE_SHIFT + PTE_INDEX_SIZE)
+#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
+#define PGDIR_MASK	(~(PGDIR_SIZE-1))
+
+/* Bits to mask out from a PGD to get to the PUD page */
+#define PGD_MASKED_BITS		0
+
+#define USER_PTRS_PER_PGD	(TASK_SIZE / PGDIR_SIZE)
+
+#define pgd_ERROR(e) \
+	pr_err("%s:%d: bad pgd %08llx.\n", __FILE__, __LINE__, (unsigned long long)pgd_val(e))
+
+/*
+ * This is the bottom of the PKMAP area with HIGHMEM or an arbitrary
+ * value (for now) on others, from where we can start layout kernel
+ * virtual space that goes below PKMAP and FIXMAP
+ */
+
+#define FIXADDR_SIZE	0
+#ifdef CONFIG_KASAN
+#include <asm/kasan.h>
+#define FIXADDR_TOP	(KASAN_SHADOW_START - PAGE_SIZE)
+#else
+#define FIXADDR_TOP	((unsigned long)(-PAGE_SIZE))
+#endif
+
+/*
+ * ioremap_bot starts at that address. Early ioremaps move down from there,
+ * until mem_init() at which point this becomes the top of the vmalloc
+ * and ioremap space
+ */
+#ifdef CONFIG_HIGHMEM
+#define IOREMAP_TOP	PKMAP_BASE
+#else
+#define IOREMAP_TOP	FIXADDR_START
+#endif
+
+/* PPC32 shares vmalloc area with ioremap */
+#define IOREMAP_START	VMALLOC_START
+#define IOREMAP_END	VMALLOC_END
+
+/*
+ * Just any arbitrary offset to the start of the vmalloc VM area: the
+ * current 16MB value just means that there will be a 64MB "hole" after the
+ * physical memory until the kernel virtual memory starts.  That means that
+ * any out-of-bounds memory accesses will hopefully be caught.
+ * The vmalloc() routines leaves a hole of 4kB between each vmalloced
+ * area for the same reason. ;)
+ *
+ * We no longer map larger than phys RAM with the BATs so we don't have
+ * to worry about the VMALLOC_OFFSET causing problems.  We do have to worry
+ * about clashes between our early calls to ioremap() that start growing down
+ * from IOREMAP_TOP being run into the VM area allocations (growing upwards
+ * from VMALLOC_START).  For this reason we have ioremap_bot to check when
+ * we actually run into our mappings setup in the early boot with the VM
+ * system.  This really does become a problem for machines with good amounts
+ * of RAM.  -- Cort
+ */
+#define VMALLOC_OFFSET (0x1000000) /* 16M */
+#ifdef PPC_PIN_SIZE
+#define VMALLOC_START (((ALIGN((long)high_memory, PPC_PIN_SIZE) + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
+#else
+#define VMALLOC_START ((((long)high_memory + VMALLOC_OFFSET) & ~(VMALLOC_OFFSET-1)))
+#endif
+
+#ifdef CONFIG_KASAN_VMALLOC
+#define VMALLOC_END	ALIGN_DOWN(ioremap_bot, PAGE_SIZE << KASAN_SHADOW_SCALE_SHIFT)
+#else
+#define VMALLOC_END	ioremap_bot
+#endif
+
+/*
+ * Bits in a linux-style PTE.  These match the bits in the
+ * (hardware-defined) PowerPC PTE as closely as possible.
+ */
+
+#if defined(CONFIG_44x)
+#include <asm/nohash/32/pte-44x.h>
+#elif defined(CONFIG_PPC_85xx)
+#include <asm/nohash/pte-e500.h>
+#elif defined(CONFIG_PPC_8xx)
+#include <asm/nohash/32/pte-8xx.h>
+#endif
+
+/*
+ * Location of the PFN in the PTE. Most 32-bit platforms use the same
+ * as _PAGE_SHIFT here (ie, naturally aligned).
+ * Platform who don't just pre-define the value so we don't override it here.
+ */
+#ifndef PTE_RPN_SHIFT
+#define PTE_RPN_SHIFT	(PAGE_SHIFT)
+#endif
+
+/*
+ * The mask covered by the RPN must be a ULL on 32-bit platforms with
+ * 64-bit PTEs.
+ */
+#ifdef CONFIG_PTE_64BIT
+#define PTE_RPN_MASK	(~((1ULL << PTE_RPN_SHIFT) - 1))
+#define MAX_POSSIBLE_PHYSMEM_BITS 36
+#else
+#define PTE_RPN_MASK	(~((1UL << PTE_RPN_SHIFT) - 1))
+#define MAX_POSSIBLE_PHYSMEM_BITS 32
+#endif
+
+#ifndef __ASSEMBLER__
+
+#define pmd_none(pmd)		(!pmd_val(pmd))
+#define	pmd_bad(pmd)		(pmd_val(pmd) & _PMD_BAD)
+#define	pmd_present(pmd)	(pmd_val(pmd) & _PMD_PRESENT_MASK)
+static inline void pmd_clear(pmd_t *pmdp)
+{
+	*pmdp = __pmd(0);
+}
+
+/*
+ * Note that on Book E processors, the pmd contains the kernel virtual
+ * (lowmem) address of the pte page.  The physical address is less useful
+ * because everything runs with translation enabled (even the TLB miss
+ * handler).  On everything else the pmd contains the physical address
+ * of the pte page.  -- paulus
+ */
+#ifndef CONFIG_BOOKE
+#define pmd_pfn(pmd)		(pmd_val(pmd) >> PAGE_SHIFT)
+#else
+#define pmd_page_vaddr(pmd)	\
+	((const void *)((unsigned long)pmd_val(pmd) & ~(PTE_TABLE_SIZE - 1)))
+#define pmd_pfn(pmd)		(__pa(pmd_val(pmd)) >> PAGE_SHIFT)
+#endif
+
+#define pmd_page(pmd)		pfn_to_page(pmd_pfn(pmd))
+
+/*
+ * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
+ * are !pte_none() && !pte_present().
+ *
+ * Format of swap PTEs (32bit PTEs):
+ *
+ *                         1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *   <------------------ offset -------------------> < type -> E 0 0
+ *
+ * E is the exclusive marker that is not stored in swap entries.
+ *
+ * For 64bit PTEs, the offset is extended by 32bit.
+ */
+#define __swp_type(entry)		((entry).val & 0x1f)
+#define __swp_offset(entry)		((entry).val >> 5)
+#define __swp_entry(type, offset)	((swp_entry_t) { ((type) & 0x1f) | ((offset) << 5) })
+#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) >> 3 })
+#define __swp_entry_to_pte(x)		((pte_t) { (x).val << 3 })
+
+/* We borrow LSB 2 to store the exclusive marker in swap PTEs. */
+#define _PAGE_SWP_EXCLUSIVE	0x000004
+
+#endif /* !__ASSEMBLER__ */
+
+#endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */

linux-7.2.3/arch/powerpc/include/asm/nohash/32/pte-44x.h

@@ -0,0 +1,103 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_NOHASH_32_PTE_44x_H
+#define _ASM_POWERPC_NOHASH_32_PTE_44x_H
+#ifdef __KERNEL__
+
+/*
+ * Definitions for PPC440
+ *
+ * Because of the 3 word TLB entries to support 36-bit addressing,
+ * the attribute are difficult to map in such a fashion that they
+ * are easily loaded during exception processing.  I decided to
+ * organize the entry so the ERPN is the only portion in the
+ * upper word of the PTE and the attribute bits below are packed
+ * in as sensibly as they can be in the area below a 4KB page size
+ * oriented RPN.  This at least makes it easy to load the RPN and
+ * ERPN fields in the TLB. -Matt
+ *
+ * This isn't entirely true anymore, at least some bits are now
+ * easier to move into the TLB from the PTE. -BenH.
+ *
+ * Note that these bits preclude future use of a page size
+ * less than 4KB.
+ *
+ *
+ * PPC 440 core has following TLB attribute fields;
+ *
+ *   TLB1:
+ *   0  1  2  3  4  ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
+ *   RPN.................................  -  -  -  -  -  - ERPN.......
+ *
+ *   TLB2:
+ *   0  1  2  3  4  ... 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
+ *   -  -  -  -  -    - U0 U1 U2 U3 W  I  M  G  E   - UX UW UR SX SW SR
+ *
+ * Newer 440 cores (440x6 as used on AMCC 460EX/460GT) have additional
+ * TLB2 storage attribute fields. Those are:
+ *
+ *   TLB2:
+ *   0...10    11   12   13   14   15   16...31
+ *   no change WL1  IL1I IL1D IL2I IL2D no change
+ *
+ * There are some constrains and options, to decide mapping software bits
+ * into TLB entry.
+ *
+ *   - PRESENT *must* be in the bottom three bits because swap cache
+ *     entries use the top 29 bits for TLB2.
+ *
+ *   - CACHE COHERENT bit (M) has no effect on original PPC440 cores,
+ *     because it doesn't support SMP. However, some later 460 variants
+ *     have -some- form of SMP support and so I keep the bit there for
+ *     future use
+ *
+ * With the PPC 44x Linux implementation, the 0-11th LSBs of the PTE are used
+ * for memory protection related functions (see PTE structure in
+ * include/asm-ppc/mmu.h).  The _PAGE_XXX definitions in this file map to the
+ * above bits.  Note that the bit values are CPU specific, not architecture
+ * specific.
+ *
+ * The kernel PTE entry can be an ordinary PTE mapping a page or a special swap
+ * PTE. In case of a swap PTE, LSB 2-24 are used to store information regarding
+ * the swap entry. However LSB 0-1 still hold protection values, for example,
+ * to distinguish swap PTEs from ordinary PTEs, and must be used with care.
+ */
+
+#define _PAGE_PRESENT	0x00000001		/* S: PTE valid */
+#define _PAGE_WRITE	0x00000002		/* S: Write permission */
+#define _PAGE_EXEC	0x00000004		/* H: Execute permission */
+#define _PAGE_READ	0x00000008		/* S: Read permission */
+#define _PAGE_DIRTY	0x00000010		/* S: Page dirty */
+#define _PAGE_SPECIAL	0x00000020		/* S: Special page */
+#define _PAGE_ACCESSED	0x00000040		/* S: Page referenced */
+#define _PAGE_ENDIAN	0x00000080		/* H: E bit */
+#define _PAGE_GUARDED	0x00000100		/* H: G bit */
+#define _PAGE_COHERENT	0x00000200		/* H: M bit */
+#define _PAGE_NO_CACHE	0x00000400		/* H: I bit */
+#define _PAGE_WRITETHRU	0x00000800		/* H: W bit */
+
+/* TODO: Add large page lowmem mapping support */
+#define _PMD_PRESENT	0
+#define _PMD_PRESENT_MASK (PAGE_MASK)
+#define _PMD_BAD	(~PAGE_MASK)
+#define _PMD_USER	0
+
+/* ERPN in a PTE never gets cleared, ignore it */
+#define _PTE_NONE_MASK	0xffffffff00000000ULL
+
+/*
+ * We define 2 sets of base prot bits, one for basic pages (ie,
+ * cacheable kernel and user pages) and one for non cacheable
+ * pages. We always set _PAGE_COHERENT when SMP is enabled or
+ * the processor might need it for DMA coherency.
+ */
+#define _PAGE_BASE_NC	(_PAGE_PRESENT | _PAGE_ACCESSED)
+#if defined(CONFIG_SMP)
+#define _PAGE_BASE	(_PAGE_BASE_NC | _PAGE_COHERENT)
+#else
+#define _PAGE_BASE	(_PAGE_BASE_NC)
+#endif
+
+#include <asm/pgtable-masks.h>
+
+#endif /* __KERNEL__ */
+#endif /*  _ASM_POWERPC_NOHASH_32_PTE_44x_H */

linux-7.2.3/arch/powerpc/include/asm/nohash/32/pte-8xx.h

@@ -0,0 +1,241 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_POWERPC_NOHASH_32_PTE_8xx_H
+#define _ASM_POWERPC_NOHASH_32_PTE_8xx_H
+#ifdef __KERNEL__
+
+/*
+ * The PowerPC MPC8xx uses a TLB with hardware assisted, software tablewalk.
+ * We also use the two level tables, but we can put the real bits in them
+ * needed for the TLB and tablewalk.  These definitions require Mx_CTR.PPM = 0,
+ * Mx_CTR.PPCS = 0, and MD_CTR.TWAM = 1.  The level 2 descriptor has
+ * additional page protection (when Mx_CTR.PPCS = 1) that allows TLB hit
+ * based upon user/super access.  The TLB does not have accessed nor write
+ * protect.  We assume that if the TLB get loaded with an entry it is
+ * accessed, and overload the changed bit for write protect.  We use
+ * two bits in the software pte that are supposed to be set to zero in
+ * the TLB entry (24 and 25) for these indicators.  Although the level 1
+ * descriptor contains the guarded and writethrough/copyback bits, we can
+ * set these at the page level since they get copied from the Mx_TWC
+ * register when the TLB entry is loaded.  We will use bit 27 for guard, since
+ * that is where it exists in the MD_TWC, and bit 26 for writethrough.
+ * These will get masked from the level 2 descriptor at TLB load time, and
+ * copied to the MD_TWC before it gets loaded.
+ * Large page sizes added.  We currently support two sizes, 4K and 8M.
+ * This also allows a TLB hander optimization because we can directly
+ * load the PMD into MD_TWC.  The 8M pages are only used for kernel
+ * mapping of well known areas.  The PMD (PGD) entries contain control
+ * flags in addition to the address, so care must be taken that the
+ * software no longer assumes these are only pointers.
+ */
+
+/* Definitions for 8xx embedded chips. */
+#define _PAGE_PRESENT	0x0001	/* V: Page is valid */
+#define _PAGE_NO_CACHE	0x0002	/* CI: cache inhibit */
+#define _PAGE_SH	0x0004	/* SH: No ASID (context) compare */
+#define _PAGE_SPS	0x0008	/* SPS: Small Page Size (1 if 16k, 512k or 8M)*/
+#define _PAGE_DIRTY	0x0100	/* C: page changed */
+
+/* These 4 software bits must be masked out when the L2 entry is loaded
+ * into the TLB.
+ */
+#define _PAGE_GUARDED	0x0010	/* Copied to L1 G entry in DTLB */
+#define _PAGE_ACCESSED	0x0020	/* Copied to L1 APG 1 entry in I/DTLB */
+#define _PAGE_EXEC	0x0040	/* Copied to PP (bit 21) in ITLB */
+#define _PAGE_SPECIAL	0x0080	/* SW entry */
+
+#define _PAGE_NA	0x0200	/* Supervisor NA, User no access */
+#define _PAGE_RO	0x0600	/* Supervisor RO, User no access */
+
+#define _PAGE_HUGE	0x0800	/* Copied to L1 PS bit 29 */
+
+#define _PAGE_NAX	(_PAGE_NA | _PAGE_EXEC)
+#define _PAGE_ROX	(_PAGE_RO | _PAGE_EXEC)
+#define _PAGE_RW	0
+#define _PAGE_RWX	_PAGE_EXEC
+
+/* cache related flags non existing on 8xx */
+#define _PAGE_COHERENT	0
+#define _PAGE_WRITETHRU	0
+
+#define _PAGE_KERNEL_RO		(_PAGE_SH | _PAGE_RO)
+#define _PAGE_KERNEL_ROX	(_PAGE_SH | _PAGE_RO | _PAGE_EXEC)
+#define _PAGE_KERNEL_RW		(_PAGE_SH | _PAGE_DIRTY)
+#define _PAGE_KERNEL_RWX	(_PAGE_SH | _PAGE_DIRTY | _PAGE_EXEC)
+
+#define _PMD_PRESENT	0x0001
+#define _PMD_PRESENT_MASK	_PMD_PRESENT
+#define _PMD_BAD	0x0f90
+#define _PMD_PAGE_MASK	0x000c
+#define _PMD_PAGE_8M	0x000c
+#define _PMD_PAGE_512K	0x0004
+#define _PMD_ACCESSED	0x0020	/* APG 1 */
+#define _PMD_USER	0x0040	/* APG 2 */
+
+#define _PTE_NONE_MASK	0
+
+#ifdef CONFIG_PPC_16K_PAGES
+#define _PAGE_BASE_NC	(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_SPS)
+#else
+#define _PAGE_BASE_NC	(_PAGE_PRESENT | _PAGE_ACCESSED)
+#endif
+
+#define _PAGE_BASE	(_PAGE_BASE_NC)
+
+#include <asm/pgtable-masks.h>
+
+#ifndef __ASSEMBLER__
+static inline pte_t pte_wrprotect(pte_t pte)
+{
+	return __pte(pte_val(pte) | _PAGE_RO);
+}
+
+#define pte_wrprotect pte_wrprotect
+
+static inline int pte_read(pte_t pte)
+{
+	return (pte_val(pte) & _PAGE_RO) != _PAGE_NA;
+}
+
+#define pte_read pte_read
+
+static inline int pte_write(pte_t pte)
+{
+	return !(pte_val(pte) & _PAGE_RO);
+}
+
+#define pte_write pte_write
+
+static inline pte_t pte_mkwrite_novma(pte_t pte)
+{
+	return __pte(pte_val(pte) & ~_PAGE_RO);
+}
+
+#define pte_mkwrite_novma pte_mkwrite_novma
+
+static inline pte_t pte_mkhuge(pte_t pte)
+{
+	return __pte(pte_val(pte) | _PAGE_SPS | _PAGE_HUGE);
+}
+
+#define pte_mkhuge pte_mkhuge
+
+static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
+				     unsigned long clr, unsigned long set, int huge);
+
+static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	pte_update(mm, addr, ptep, 0, _PAGE_RO, 0);
+}
+#define ptep_set_wrprotect ptep_set_wrprotect
+
+static inline void __ptep_set_access_flags(struct vm_area_struct *vma, pte_t *ptep,
+					   pte_t entry, unsigned long address, int psize)
+{
+	unsigned long set = pte_val(entry) & (_PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_EXEC);
+	unsigned long clr = ~pte_val(entry) & _PAGE_RO;
+	int huge = psize > mmu_virtual_psize ? 1 : 0;
+
+	pte_update(vma->vm_mm, address, ptep, clr, set, huge);
+
+	flush_tlb_page(vma, address);
+}
+#define __ptep_set_access_flags __ptep_set_access_flags
+
+static inline unsigned long __pte_leaf_size(pmd_t pmd, pte_t pte)
+{
+	pte_basic_t val = pte_val(pte);
+
+	if (pmd_val(pmd) & _PMD_PAGE_8M)
+		return SZ_8M;
+	if (val & _PAGE_HUGE)
+		return SZ_512K;
+	if (val & _PAGE_SPS)
+		return SZ_16K;
+	return SZ_4K;
+}
+
+#define __pte_leaf_size __pte_leaf_size
+
+/*
+ * On the 8xx, the page tables are a bit special. For 16k pages, we have
+ * 4 identical entries. For 512k pages, we have 128 entries as if it was
+ * 4k pages, but they are flagged as 512k pages for the hardware.
+ * For 8M pages, we have 1024 entries as if it was 4M pages (PMD_SIZE)
+ * but they are flagged as 8M pages for the hardware.
+ * For 4k pages, we have a single entry in the table.
+ */
+static pmd_t *pmd_off(struct mm_struct *mm, unsigned long addr);
+static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long address);
+
+static inline bool ptep_is_8m_pmdp(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+	return (pmd_t *)ptep == pmd_off(mm, ALIGN_DOWN(addr, SZ_8M));
+}
+
+static inline int number_of_cells_per_pte(pmd_t *pmd, pte_basic_t val, int huge)
+{
+	if (!huge)
+		return PAGE_SIZE / SZ_4K;
+	else if ((pmd_val(*pmd) & _PMD_PAGE_MASK) == _PMD_PAGE_8M)
+		return SZ_4M / SZ_4K;
+	else if (IS_ENABLED(CONFIG_PPC_4K_PAGES) && !(val & _PAGE_HUGE))
+		return SZ_16K / SZ_4K;
+	else
+		return SZ_512K / SZ_4K;
+}
+
+static inline pte_basic_t __pte_update(struct mm_struct *mm, unsigned long addr, pte_t *p,
+				       unsigned long clr, unsigned long set, int huge)
+{
+	pte_basic_t *entry = (pte_basic_t *)p;
+	pte_basic_t old = pte_val(*p);
+	pte_basic_t new = (old & ~(pte_basic_t)clr) | set;
+	int num, i;
+	pmd_t *pmd = pmd_off(mm, addr);
+
+	num = number_of_cells_per_pte(pmd, new, huge);
+
+	for (i = 0; i < num; i += PAGE_SIZE / SZ_4K, new += PAGE_SIZE) {
+		*entry++ = new;
+		if (IS_ENABLED(CONFIG_PPC_16K_PAGES)) {
+			*entry++ = new;
+			*entry++ = new;
+			*entry++ = new;
+		}
+	}
+
+	return old;
+}
+
+static inline pte_basic_t pte_update(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
+				     unsigned long clr, unsigned long set, int huge)
+{
+	pte_basic_t old;
+
+	if (huge && ptep_is_8m_pmdp(mm, addr, ptep)) {
+		pmd_t *pmdp = (pmd_t *)ptep;
+
+		old = __pte_update(mm, addr, pte_offset_kernel(pmdp, 0), clr, set, huge);
+		__pte_update(mm, addr, pte_offset_kernel(pmdp + 1, 0), clr, set, huge);
+	} else {
+		old = __pte_update(mm, addr, ptep, clr, set, huge);
+	}
+	return old;
+}
+#define pte_update pte_update
+
+#ifdef CONFIG_PPC_16K_PAGES
+#define ptep_get ptep_get
+static inline pte_t ptep_get(pte_t *ptep)
+{
+	pte_basic_t val = READ_ONCE(ptep->pte);
+	pte_t pte = {val, val, val, val};
+
+	return pte;
+}
+#endif /* CONFIG_PPC_16K_PAGES */
+
+#endif
+
+#endif /* __KERNEL__ */
+#endif /*  _ASM_POWERPC_NOHASH_32_PTE_8xx_H */