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bda0e064af
New files are an exact copy of pb926 files, but will help in testing different configurations and compilations.
161 lines
4.9 KiB
C
161 lines
4.9 KiB
C
/*
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* ARM v5-specific virtual memory details
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __V5_MM_H__
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#define __V5_MM_H__
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/* ARM specific definitions */
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#define VIRT_MEM_START 0
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#define VIRT_MEM_END 0xFFFFFFFF
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#define ARM_SECTION_SIZE SZ_1MB
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#define ARM_SECTION_MASK (ARM_SECTION_SIZE - 1)
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#define ARM_SECTION_BITS 20
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#define ARM_PAGE_SIZE SZ_4K
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#define ARM_PAGE_MASK 0xFFF
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#define ARM_PAGE_BITS 12
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#define PGD_SIZE SZ_4K * 4
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#define PGD_ENTRY_TOTAL SZ_4K
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#define PGD_TYPE_MASK 0x3
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#define PGD_COARSE_ALIGN_MASK 0xFFFFFC00
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#define PGD_SECTION_ALIGN_MASK 0xFFF00000
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#define PGD_FINE_ALIGN_MASK 0xFFFFF000
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#define PGD_TYPE_FAULT 0
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#define PGD_TYPE_COARSE 1
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#define PGD_TYPE_SECTION 2
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#define PGD_TYPE_FINE 3
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#define PMD_TYPE_MASK 0x3
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#define PMD_TYPE_FAULT 0
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#define PMD_TYPE_LARGE 1
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#define PMD_TYPE_SMALL 2
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#define PMD_TYPE_TINY 3
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/* Permission field offsets */
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#define SECTION_AP0 10
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#define PMD_SIZE SZ_1K
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#define PMD_ENTRY_TOTAL 256
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#define PMD_MAP_SIZE SZ_1MB
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/* Type-checkable page table elements */
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typedef u32 pgd_t;
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typedef u32 pmd_t;
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typedef u32 pte_t;
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/* Page global directory made up of pgd_t entries */
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typedef struct pgd_table {
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pgd_t entry[PGD_ENTRY_TOTAL];
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} pgd_table_t;
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/* Page middle directory made up of pmd_t entries */
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typedef struct pmd_table {
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pmd_t entry[PMD_ENTRY_TOTAL];
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} pmd_table_t;
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/* Applies for both small and large pages */
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#define PAGE_AP0 4
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#define PAGE_AP1 6
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#define PAGE_AP2 8
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#define PAGE_AP3 10
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/* Permission values with rom and sys bits ignored */
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#define SVC_RW_USR_NONE 1
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#define SVC_RW_USR_RO 2
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#define SVC_RW_USR_RW 3
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#define PTE_PROT_MASK (0xFF << 4)
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#define CACHEABILITY 3
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#define BUFFERABILITY 2
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#define cacheable (1 << CACHEABILITY)
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#define bufferable (1 << BUFFERABILITY)
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#define uncacheable 0
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#define unbufferable 0
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/* Helper macros for common cases */
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#define __MAP_USR_RW_FLAGS (cacheable | bufferable | (SVC_RW_USR_RW << PAGE_AP0) \
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| (SVC_RW_USR_RW << PAGE_AP1) | (SVC_RW_USR_RW << PAGE_AP2) \
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| (SVC_RW_USR_RW << PAGE_AP3))
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#define __MAP_USR_RO_FLAGS (cacheable | bufferable | (SVC_RW_USR_RO << PAGE_AP0) \
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| (SVC_RW_USR_RO << PAGE_AP1) | (SVC_RW_USR_RO << PAGE_AP2) \
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| (SVC_RW_USR_RO << PAGE_AP3))
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#define __MAP_SVC_RW_FLAGS (cacheable | bufferable | (SVC_RW_USR_NONE << PAGE_AP0) \
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| (SVC_RW_USR_NONE << PAGE_AP1) | (SVC_RW_USR_NONE << PAGE_AP2) \
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| (SVC_RW_USR_NONE << PAGE_AP3))
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#define __MAP_SVC_IO_FLAGS (uncacheable | unbufferable | (SVC_RW_USR_NONE << PAGE_AP0) \
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| (SVC_RW_USR_NONE << PAGE_AP1) | (SVC_RW_USR_NONE << PAGE_AP2) \
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| (SVC_RW_USR_NONE << PAGE_AP3))
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#define __MAP_USR_IO_FLAGS (uncacheable | unbufferable | (SVC_RW_USR_RW << PAGE_AP0) \
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| (SVC_RW_USR_RW << PAGE_AP1) | (SVC_RW_USR_RW << PAGE_AP2) \
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| (SVC_RW_USR_RW << PAGE_AP3))
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/* Abort information */
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/*FIXME: Carry all these definitions to an abort.h, Also carry all abort code to abort.c. Much neater!!! */
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/* Abort type */
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#define ARM_PABT 1
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#define ARM_DABT 0
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/* The kernel makes use of bit 8 (Always Zero) of FSR to define which type of abort */
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#define set_abort_type(fsr, x) { fsr &= ~(1 << 8); fsr |= ((x & 1) << 8); }
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#define ARM_FSR_MASK 0xF
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#define is_prefetch_abort(fsr) ((fsr >> 8) & 0x1)
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#define is_data_abort(fsr) (!is_prefetch_abort(fsr))
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/*
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* v5 Architecture-defined data abort values for FSR ordered
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* in highest to lowest priority.
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*/
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#define DABT_TERMINAL 0x2
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#define DABT_VECTOR 0x0 /* Obsolete */
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#define DABT_ALIGN 0x1
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#define DABT_EXT_XLATE_LEVEL1 0xC
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#define DABT_EXT_XLATE_LEVEL2 0xE
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#define DABT_XLATE_SECT 0x5
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#define DABT_XLATE_PAGE 0x7
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#define DABT_DOMAIN_SECT 0x9
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#define DABT_DOMAIN_PAGE 0xB
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#define DABT_PERM_SECT 0xD
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#define DABT_PERM_PAGE 0xF
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#define DABT_EXT_LFETCH_SECT 0x4
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#define DABT_EXT_LFETCH_PAGE 0x6
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#define DABT_EXT_NON_LFETCH_SECT 0x8
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#define DABT_EXT_NON_LFETCH_PAGE 0xA
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#define TASK_PGD(x) (x)->space->pgd
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#define STACK_ALIGNMENT 8
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/* Kernel's data about the fault */
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typedef struct fault_kdata {
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u32 faulty_pc;
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u32 fsr;
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u32 far;
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pte_t pte;
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} __attribute__ ((__packed__)) fault_kdata_t;
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void arch_hardware_flush(pgd_table_t *pgd);
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void add_section_mapping_init(unsigned int paddr, unsigned int vaddr,
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unsigned int size, unsigned int flags);
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void add_boot_mapping(unsigned int paddr, unsigned int vaddr,
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unsigned int size, unsigned int flags);
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struct address_space;
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int delete_page_tables(struct address_space *space);
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int copy_user_tables(struct address_space *new, struct address_space *orig);
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pgd_table_t *copy_page_tables(pgd_table_t *from);
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void remap_as_pages(void *vstart, void *vend);
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int pgd_count_pmds(pgd_table_t *pgd);
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pgd_table_t *realloc_page_tables(void);
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void remove_section_mapping(unsigned long vaddr);
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void copy_pgds_by_vrange(pgd_table_t *to, pgd_table_t *from,
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unsigned long start, unsigned long end);
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#endif /* __V5_MM_H__ */
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