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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/microblaze/include/asm/mmu.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/microblaze/include/asm/mmu.h')
-rw-r--r--arch/microblaze/include/asm/mmu.h119
1 files changed, 119 insertions, 0 deletions
diff --git a/arch/microblaze/include/asm/mmu.h b/arch/microblaze/include/asm/mmu.h
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+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2008-2009 Michal Simek <monstr@monstr.eu>
+ * Copyright (C) 2008-2009 PetaLogix
+ * Copyright (C) 2006 Atmark Techno, Inc.
+ */
+
+#ifndef _ASM_MICROBLAZE_MMU_H
+#define _ASM_MICROBLAZE_MMU_H
+
+# ifdef __KERNEL__
+# ifndef __ASSEMBLY__
+
+/* Default "unsigned long" context */
+typedef unsigned long mm_context_t;
+
+/* Hardware Page Table Entry */
+typedef struct _PTE {
+ unsigned long v:1; /* Entry is valid */
+ unsigned long vsid:24; /* Virtual segment identifier */
+ unsigned long h:1; /* Hash algorithm indicator */
+ unsigned long api:6; /* Abbreviated page index */
+ unsigned long rpn:20; /* Real (physical) page number */
+ unsigned long :3; /* Unused */
+ unsigned long r:1; /* Referenced */
+ unsigned long c:1; /* Changed */
+ unsigned long w:1; /* Write-thru cache mode */
+ unsigned long i:1; /* Cache inhibited */
+ unsigned long m:1; /* Memory coherence */
+ unsigned long g:1; /* Guarded */
+ unsigned long :1; /* Unused */
+ unsigned long pp:2; /* Page protection */
+} PTE;
+
+/* Values for PP (assumes Ks=0, Kp=1) */
+# define PP_RWXX 0 /* Supervisor read/write, User none */
+# define PP_RWRX 1 /* Supervisor read/write, User read */
+# define PP_RWRW 2 /* Supervisor read/write, User read/write */
+# define PP_RXRX 3 /* Supervisor read, User read */
+
+/* Segment Register */
+typedef struct _SEGREG {
+ unsigned long t:1; /* Normal or I/O type */
+ unsigned long ks:1; /* Supervisor 'key' (normally 0) */
+ unsigned long kp:1; /* User 'key' (normally 1) */
+ unsigned long n:1; /* No-execute */
+ unsigned long :4; /* Unused */
+ unsigned long vsid:24; /* Virtual Segment Identifier */
+} SEGREG;
+
+extern void _tlbie(unsigned long va); /* invalidate a TLB entry */
+extern void _tlbia(void); /* invalidate all TLB entries */
+
+/*
+ * tlb_skip size stores actual number skipped TLBs from TLB0 - every directy TLB
+ * mapping has to increase tlb_skip size.
+ */
+extern u32 tlb_skip;
+# endif /* __ASSEMBLY__ */
+
+/*
+ * The MicroBlaze processor has a TLB architecture identical to PPC-40x. The
+ * instruction and data sides share a unified, 64-entry, semi-associative
+ * TLB which is maintained totally under software control. In addition, the
+ * instruction side has a hardware-managed, 2,4, or 8-entry, fully-associative
+ * TLB which serves as a first level to the shared TLB. These two TLBs are
+ * known as the UTLB and ITLB, respectively.
+ */
+
+# define MICROBLAZE_TLB_SIZE 64
+
+/* For cases when you want to skip some TLB entries */
+# define MICROBLAZE_TLB_SKIP 0
+
+/* Use the last TLB for temporary access to LMB */
+# define MICROBLAZE_LMB_TLB_ID 63
+
+/*
+ * TLB entries are defined by a "high" tag portion and a "low" data
+ * portion. The data portion is 32-bits.
+ *
+ * TLB entries are managed entirely under software control by reading,
+ * writing, and searching using the MTS and MFS instructions.
+ */
+
+# define TLB_LO 1
+# define TLB_HI 0
+# define TLB_DATA TLB_LO
+# define TLB_TAG TLB_HI
+
+/* Tag portion */
+# define TLB_EPN_MASK 0xFFFFFC00 /* Effective Page Number */
+# define TLB_PAGESZ_MASK 0x00000380
+# define TLB_PAGESZ(x) (((x) & 0x7) << 7)
+# define PAGESZ_1K 0
+# define PAGESZ_4K 1
+# define PAGESZ_16K 2
+# define PAGESZ_64K 3
+# define PAGESZ_256K 4
+# define PAGESZ_1M 5
+# define PAGESZ_4M 6
+# define PAGESZ_16M 7
+# define TLB_VALID 0x00000040 /* Entry is valid */
+
+/* Data portion */
+# define TLB_RPN_MASK 0xFFFFFC00 /* Real Page Number */
+# define TLB_PERM_MASK 0x00000300
+# define TLB_EX 0x00000200 /* Instruction execution allowed */
+# define TLB_WR 0x00000100 /* Writes permitted */
+# define TLB_ZSEL_MASK 0x000000F0
+# define TLB_ZSEL(x) (((x) & 0xF) << 4)
+# define TLB_ATTR_MASK 0x0000000F
+# define TLB_W 0x00000008 /* Caching is write-through */
+# define TLB_I 0x00000004 /* Caching is inhibited */
+# define TLB_M 0x00000002 /* Memory is coherent */
+# define TLB_G 0x00000001 /* Memory is guarded from prefetch */
+
+# endif /* __KERNEL__ */
+#endif /* _ASM_MICROBLAZE_MMU_H */