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509e949983
Next issues: For every read fault, the fault must traverse the vma's object stack until the page is found. The problem was that we were only searching the first object, that object was a writable shadow, and the shadow didn't have the read-only page, and the 0 return value was interpreted with IS_ERR() and failed, so address 0 was mapped into the location, and QEMU blew off.
131 lines
4.2 KiB
C
131 lines
4.2 KiB
C
/*
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* Includes memory-related architecture specific definitions and their
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* corresponding generic wrappers.
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*
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* Copyright (C) 2007 Bahadir Balban
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*/
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#ifndef __GLUE_ARM_MEMORY_H__
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#define __GLUE_ARM_MEMORY_H__
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#include INC_ARCH(bootdesc.h) /* Definition of last loaded svc image address */
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#include INC_GLUE(memlayout.h) /* Important generic definitions */
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#include INC_SUBARCH(mm.h)
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/* Generic definitions */
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#define PAGE_SIZE ARM_PAGE_SIZE
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#define PAGE_MASK ARM_PAGE_MASK
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#define PAGE_BITS ARM_PAGE_BITS
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/*
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* This defines the largest size defined by this architecture that is
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* easily mappable. ARM supports 1MB mappings so it fits well. If it's
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* unsupported by the arch then a reasonable size could be 1MB.
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*/
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#define SECTION_SIZE ARM_SECTION_SIZE
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#define SECTION_MASK ARM_SECTION_MASK
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#define SECTION_BITS ARM_SECTION_BITS
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/* Aligns to the upper page (ceiling) FIXME: Must add a wraparound checker. */
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#define page_align_up(addr) ((((unsigned int)(addr)) + \
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(PAGE_SIZE - 1)) & \
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(~PAGE_MASK))
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/* Aligns to the lower page (floor) */
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#define page_align(addr) (((unsigned int)(addr)) & \
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(~PAGE_MASK))
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#define is_aligned(val, mask) (!(((unsigned long)val) & mask))
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#define is_page_aligned(val) (!(((unsigned long)val) & PAGE_MASK))
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/* Align to given size */
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#define align(addr, size) (((unsigned int)(addr)) & (~(size-1)))
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/* Extract page frame number from address and vice versa. */
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#define __pfn(x) (((unsigned long)(x)) >> PAGE_BITS)
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#define __pfn_to_addr(x) (((unsigned long)(x)) << PAGE_BITS)
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/* Extract physical address from page table entry (pte) */
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#define __pte_to_addr(x) (((unsigned long)(x)) & ~PAGE_MASK)
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/* Minimum excess needed for word alignment */
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#define SZ_WORD sizeof(unsigned int)
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#define WORD_BITS 32
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#define WORD_BITS_LOG2 5
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#define BITWISE_GETWORD(x) ((x) >> WORD_BITS_LOG2) /* Divide by 32 */
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#define BITWISE_GETBIT(x) (1 << ((x) % WORD_BITS))
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#define align_up(addr, size) ((((unsigned long)(addr)) + ((size) - 1)) & (~((size) - 1)))
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/* Endianness conversion */
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static inline void be32_to_cpu(unsigned int x)
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{
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char *p = (char *)&x;
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char tmp;
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/* Swap bytes */
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tmp = p[0];
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p[0] = p[3];
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p[3] = tmp;
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tmp = p[1];
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p[1] = p[2];
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p[2] = tmp;
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}
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/* Some anticipated values in terms of memory consumption */
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#define TASK_AVERAGE_SIZE SZ_16MB
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#define TASKS_PER_1MB_GRANT 28
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extern pgd_table_t kspace;
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extern pmd_table_t pmd_tables[];
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extern unsigned long pmdtab_i;
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void init_pmd_tables(void);
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pmd_table_t *alloc_boot_pmd(void);
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/*
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* Each time a pager grants memory to the kernel, these parameters are called
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* for in order to distribute the granted memory for different purposes.
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*
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* The granted memory is used in an architecture-specific way, e.g. for pgds,
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* pmds, and kernel stack. Therefore this should be defined per-arch.
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*/
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typedef struct kmem_usage_per_grant {
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int grant_size; /* The size of the grant given by pager */
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int task_size_avg; /* Average memory a task occupies */
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int tasks_per_kmem_grant; /* Num of tasks to allocate for, per grant */
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int pg_total; /* Total size of page allocs needed per grant */
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int pmd_total; /* Total size of pmd allocs needed per grant */
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int pgd_total; /* Total size of pgd allocs needed per grant */
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int extra; /* Extra unused space, left per grant */
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} kmem_usage_per_grant_t;
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void paging_init(void);
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void init_pmd_tables(void);
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void init_clear_ptab(void);
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unsigned int space_flags_to_ptflags(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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void add_mapping_pgd(unsigned int paddr, unsigned int vaddr,
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unsigned int size, unsigned int flags,
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pgd_table_t *pgd);
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void add_mapping(unsigned int paddr, unsigned int vaddr,
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unsigned int size, unsigned int flags);
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void remove_mapping(unsigned long vaddr);
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void remove_mapping_pgd(unsigned long vaddr, pgd_table_t *pgd);
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void prealloc_phys_pagedesc(void);
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int check_mapping_pgd(unsigned long vaddr, unsigned long size,
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unsigned int flags, pgd_table_t *pgd);
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int check_mapping(unsigned long vaddr, unsigned long size,
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unsigned int flags);
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void copy_pgd_kern_all(pgd_table_t *);
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pte_t virt_to_pte(unsigned long virtual);
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pte_t virt_to_pte_from_pgd(unsigned long virtual, pgd_table_t *pgd);
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#endif /* __GLUE_ARM_MEMORY_H__ */
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