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2023-12-11 6778948f9de86c3cfaf36725a7c87dcff9ba247f 
 kernel/arch/riscv/include/asm/pgtable.h
....@@ -1,20 +1,13 @@
1
+/* SPDX-License-Identifier: GPL-2.0-only */
12 /*
23  * Copyright (C) 2012 Regents of the University of California
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- *
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- *   This program is free software; you can redistribute it and/or
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- *   modify it under the terms of the GNU General Public License
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- *   as published by the Free Software Foundation, version 2.
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- *
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- *   This program is distributed in the hope that it will be useful,
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- *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *   GNU General Public License for more details.
124  */
135 
146 #ifndef _ASM_RISCV_PGTABLE_H
157 #define _ASM_RISCV_PGTABLE_H
168 
179 #include <linux/mmzone.h>
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+#include <linux/sizes.h>
1811 
1912 #include <asm/pgtable-bits.h>
2013 
....@@ -26,12 +19,54 @@
2619 #include <asm/tlbflush.h>
2720 #include <linux/mm_types.h>
2821 
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+#ifdef CONFIG_MMU
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+
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+#define VMALLOC_SIZE     (KERN_VIRT_SIZE >> 1)
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+#define VMALLOC_END      (PAGE_OFFSET - 1)
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+#define VMALLOC_START    (PAGE_OFFSET - VMALLOC_SIZE)
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+
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+#define BPF_JIT_REGION_SIZE	(SZ_128M)
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+#define BPF_JIT_REGION_START	(PAGE_OFFSET - BPF_JIT_REGION_SIZE)
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+#define BPF_JIT_REGION_END	(VMALLOC_END)
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+
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+/*
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+ * Roughly size the vmemmap space to be large enough to fit enough
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+ * struct pages to map half the virtual address space. Then
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+ * position vmemmap directly below the VMALLOC region.
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+ */
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+#define VMEMMAP_SHIFT \
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+	(CONFIG_VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)
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+#define VMEMMAP_SIZE	BIT(VMEMMAP_SHIFT)
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+#define VMEMMAP_END	(VMALLOC_START - 1)
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+#define VMEMMAP_START	(VMALLOC_START - VMEMMAP_SIZE)
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+
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+/*
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+ * Define vmemmap for pfn_to_page & page_to_pfn calls. Needed if kernel
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+ * is configured with CONFIG_SPARSEMEM_VMEMMAP enabled.
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+ */
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+#define vmemmap		((struct page *)VMEMMAP_START)
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+
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+#define PCI_IO_SIZE      SZ_16M
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+#define PCI_IO_END       VMEMMAP_START
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+#define PCI_IO_START     (PCI_IO_END - PCI_IO_SIZE)
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+
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+#define FIXADDR_TOP      PCI_IO_START
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+#ifdef CONFIG_64BIT
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+#define FIXADDR_SIZE     PMD_SIZE
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+#else
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+#define FIXADDR_SIZE     PGDIR_SIZE
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+#endif
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+#define FIXADDR_START    (FIXADDR_TOP - FIXADDR_SIZE)
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+
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+#endif
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+
2963 #ifdef CONFIG_64BIT
3064 #include <asm/pgtable-64.h>
3165 #else
3266 #include <asm/pgtable-32.h>
3367 #endif /* CONFIG_64BIT */
3468 
69
+#ifdef CONFIG_MMU
3570 /* Number of entries in the page global directory */
3671 #define PTRS_PER_PGD    (PAGE_SIZE / sizeof(pgd_t))
3772 /* Number of entries in the page table */
....@@ -39,7 +74,6 @@
3974 
4075 /* Number of PGD entries that a user-mode program can use */
4176 #define USER_PTRS_PER_PGD   (TASK_SIZE / PGDIR_SIZE)
42
-#define FIRST_USER_ADDRESS  0
4377 
4478 /* Page protection bits */
4579 #define _PAGE_BASE	(_PAGE_PRESENT | _PAGE_ACCESSED | _PAGE_USER)
....@@ -65,7 +99,18 @@
6599 				| _PAGE_DIRTY)
66100 
67101 #define PAGE_KERNEL		__pgprot(_PAGE_KERNEL)
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+#define PAGE_KERNEL_READ	__pgprot(_PAGE_KERNEL & ~_PAGE_WRITE)
68103 #define PAGE_KERNEL_EXEC	__pgprot(_PAGE_KERNEL | _PAGE_EXEC)
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+#define PAGE_KERNEL_READ_EXEC	__pgprot((_PAGE_KERNEL & ~_PAGE_WRITE) \
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+					 | _PAGE_EXEC)
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+
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+#define PAGE_TABLE		__pgprot(_PAGE_TABLE)
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+
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+/*
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+ * The RISC-V ISA doesn't yet specify how to query or modify PMAs, so we can't
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+ * change the properties of memory regions.
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+ */
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+#define _PAGE_IOREMAP _PAGE_KERNEL
69114 
70115 extern pgd_t swapper_pg_dir[];
71116 
....@@ -89,13 +134,6 @@
89134 #define __S110	PAGE_SHARED_EXEC
90135 #define __S111	PAGE_SHARED_EXEC
91136 
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-/*
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- * ZERO_PAGE is a global shared page that is always zero,
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- * used for zero-mapped memory areas, etc.
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- */
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-extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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-#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
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-
99137 static inline int pmd_present(pmd_t pmd)
100138 {
101139 	return (pmd_val(pmd) & (_PAGE_PRESENT | _PAGE_PROT_NONE));
....@@ -111,6 +149,13 @@
111149 	return !pmd_present(pmd);
112150 }
113151 
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+#define pmd_leaf	pmd_leaf
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+static inline int pmd_leaf(pmd_t pmd)
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+{
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+	return pmd_present(pmd) &&
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+	       (pmd_val(pmd) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
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+}
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+
114159 static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
115160 {
116161 	*pmdp = pmd;
....@@ -121,21 +166,15 @@
121166 	set_pmd(pmdp, __pmd(0));
122167 }
123168 
124
-
125169 static inline pgd_t pfn_pgd(unsigned long pfn, pgprot_t prot)
126170 {
127171 	return __pgd((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
128172 }
129173 
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-#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
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-
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-/* Locate an entry in the page global directory */
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-static inline pgd_t *pgd_offset(const struct mm_struct *mm, unsigned long addr)
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+static inline unsigned long _pgd_pfn(pgd_t pgd)
134175 {
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-	return mm->pgd + pgd_index(addr);
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+	return pgd_val(pgd) >> _PAGE_PFN_SHIFT;
136177 }
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-/* Locate an entry in the kernel page global directory */
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-#define pgd_offset_k(addr)      pgd_offset(&init_mm, (addr))
139178 
140179 static inline struct page *pmd_page(pmd_t pmd)
141180 {
....@@ -161,20 +200,7 @@
161200 	return __pte((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot));
162201 }
163202 
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-static inline pte_t mk_pte(struct page *page, pgprot_t prot)
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-{
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-	return pfn_pte(page_to_pfn(page), prot);
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-}
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-
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-#define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
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-
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-static inline pte_t *pte_offset_kernel(pmd_t *pmd, unsigned long addr)
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-{
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-	return (pte_t *)pmd_page_vaddr(*pmd) + pte_index(addr);
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-}
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-
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-#define pte_offset_map(dir, addr)	pte_offset_kernel((dir), (addr))
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-#define pte_unmap(pte)			((void)(pte))
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+#define mk_pte(page, prot)       pfn_pte(page_to_pfn(page), prot)
178204 
179205 static inline int pte_present(pte_t pte)
180206 {
....@@ -256,6 +282,11 @@
256282 static inline pte_t pte_mkspecial(pte_t pte)
257283 {
258284 	return __pte(pte_val(pte) | _PAGE_SPECIAL);
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+}
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+
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+static inline pte_t pte_mkhuge(pte_t pte)
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+{
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+	return pte;
259290 }
260291 
261292 /* Modify page protection bits */
....@@ -400,32 +431,55 @@
400431 #define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
401432 #define __swp_entry_to_pte(x)	((pte_t) { (x).val })
402433 
403
-#ifdef CONFIG_FLATMEM
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-#define kern_addr_valid(addr)   (1) /* FIXME */
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+/*
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+ * In the RV64 Linux scheme, we give the user half of the virtual-address space
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+ * and give the kernel the other (upper) half.
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+ */
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+#ifdef CONFIG_64BIT
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+#define KERN_VIRT_START	(-(BIT(CONFIG_VA_BITS)) + TASK_SIZE)
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+#else
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+#define KERN_VIRT_START	FIXADDR_START
405442 #endif
406443 
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-extern void paging_init(void);
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-
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-static inline void pgtable_cache_init(void)
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-{
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-	/* No page table caches to initialize */
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-}
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-
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-#define VMALLOC_SIZE     (KERN_VIRT_SIZE >> 1)
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-#define VMALLOC_END      (PAGE_OFFSET - 1)
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-#define VMALLOC_START    (PAGE_OFFSET - VMALLOC_SIZE)
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-
418444 /*
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- * Task size is 0x40000000000 for RV64 or 0xb800000 for RV32.
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+ * Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32.
420446  * Note that PGDIR_SIZE must evenly divide TASK_SIZE.
421447  */
422448 #ifdef CONFIG_64BIT
423449 #define TASK_SIZE (PGDIR_SIZE * PTRS_PER_PGD / 2)
424450 #else
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-#define TASK_SIZE VMALLOC_START
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+#define TASK_SIZE FIXADDR_START
426452 #endif
427453 
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-#include <asm-generic/pgtable.h>
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+#else /* CONFIG_MMU */
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+
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+#define PAGE_SHARED		__pgprot(0)
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+#define PAGE_KERNEL		__pgprot(0)
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+#define swapper_pg_dir		NULL
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+#define TASK_SIZE		0xffffffffUL
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+#define VMALLOC_START		0
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+#define VMALLOC_END		TASK_SIZE
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+
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+static inline void __kernel_map_pages(struct page *page, int numpages, int enable) {}
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+
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+#endif /* !CONFIG_MMU */
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+
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+#define kern_addr_valid(addr)   (1) /* FIXME */
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+
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+extern void *dtb_early_va;
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+extern uintptr_t dtb_early_pa;
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+void setup_bootmem(void);
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+void paging_init(void);
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+void misc_mem_init(void);
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+
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+#define FIRST_USER_ADDRESS  0
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+
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+/*
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+ * ZERO_PAGE is a global shared page that is always zero,
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+ * used for zero-mapped memory areas, etc.
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+ */
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+extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
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+#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
429483 
430484 #endif /* !__ASSEMBLY__ */
431485