Initial commit

include/l4/glue/arm/memory.h

@@ -0,0 +1,124 @@
+/*
+ * Includes memory-related architecture specific definitions and their
+ * corresponding generic wrappers.
+ *
+ * Copyright (C) 2007 Bahadir Balban
+ */
+#ifndef __GLUE_ARM_MEMORY_H__
+#define __GLUE_ARM_MEMORY_H__
+
+#include INC_ARCH(bootdesc.h) /* Definition of last loaded svc image address */
+#include INC_GLUE(memlayout.h) /* Important generic definitions */
+#include INC_SUBARCH(mm.h)
+
+/* Generic definitions */
+#define PAGE_SIZE			ARM_PAGE_SIZE
+#define PAGE_MASK			ARM_PAGE_MASK
+#define PAGE_BITS			ARM_PAGE_BITS
+
+/*
+ * This defines the largest size defined by this architecture that is
+ * easily mappable. ARM supports 1MB mappings so it fits well. If it's
+ * unsupported by the arch then a reasonable size could be 1MB.
+ */
+#define SECTION_SIZE			ARM_SECTION_SIZE
+#define SECTION_MASK			ARM_SECTION_MASK
+#define SECTION_BITS			ARM_SECTION_BITS
+
+/* Aligns to the upper page (ceiling) */
+#define page_align_up(addr) 		((((unsigned int)(addr)) + \
+					  (PAGE_SIZE - 1)) & \
+					 (~PAGE_MASK))
+/* Aligns to the lower page (floor) */
+#define page_align(addr)		(((unsigned int)(addr)) &  \
+					 (~PAGE_MASK))
+
+#define is_aligned(val, mask)		(!(((unsigned long)val) & mask))
+#define is_page_aligned(val)		(!(((unsigned long)val) & PAGE_MASK))
+
+/* Align to given size */
+#define	align(addr, size)		(((unsigned int)(addr)) & (~(size-1)))
+
+/* Extract page frame number from address and vice versa. */
+#define __pfn(x)		(((unsigned long)(x)) >> PAGE_BITS)
+#define __pfn_to_addr(x)	(((unsigned long)(x)) << PAGE_BITS)
+
+/* Extract physical address from page table entry (pte) */
+#define __pte_to_addr(x)	(((unsigned long)(x)) & ~PAGE_MASK)
+
+/* Minimum excess needed for word alignment */
+#define SZ_WORD				sizeof(unsigned int)
+#define WORD_BITS			32
+#define WORD_BITS_LOG2			5
+#define BITWISE_GETWORD(x)	((x) >> WORD_BITS_LOG2) /* Divide by 32 */
+#define	BITWISE_GETBIT(x)	(1 << ((x) % WORD_BITS))
+
+#define align_up(addr, size)		((((unsigned long)(addr)) + ((size) - 1)) & (~((size) - 1)))
+
+/* Endianness conversion */
+static inline void be32_to_cpu(unsigned int x)
+{
+	char *p = (char *)&x;
+	char tmp;
+
+	/* Swap bytes */
+	tmp = p[0];
+	p[0] = p[3];
+	p[3] = tmp;
+
+	tmp = p[1];
+	p[1] = p[2];
+	p[2] = tmp;
+}
+
+/* Some anticipated values in terms of memory consumption */
+#define TASK_AVERAGE_SIZE		SZ_16MB
+#define TASKS_PER_1MB_GRANT		28
+
+extern pgd_table_t kspace;
+extern pmd_table_t pmd_tables[];
+extern unsigned long pmdtab_i;
+
+void init_pmd_tables(void);
+pmd_table_t *alloc_boot_pmd(void);
+
+/*
+ * Each time a pager grants memory to the kernel, these parameters are called
+ * for in order to distribute the granted memory for different purposes.
+ *
+ * The granted memory is used in an architecture-specific way, e.g. for pgds,
+ * pmds, and kernel stack. Therefore this should be defined per-arch.
+ */
+typedef struct kmem_usage_per_grant {
+	int grant_size;		/* The size of the grant given by pager */
+	int task_size_avg;	/* Average memory a task occupies */
+	int tasks_per_kmem_grant; /* Num of tasks to allocate for, per grant */
+	int pg_total;		/* Total size of page allocs needed per grant */
+	int pmd_total;		/* Total size of pmd allocs needed per grant */
+	int pgd_total;		/* Total size of pgd allocs needed per grant */
+	int extra;		/* Extra unused space, left per grant */
+} kmem_usage_per_grant_t;
+
+void paging_init(void);
+void init_pmd_tables(void);
+void init_clear_ptab(void);
+
+unsigned int space_flags_to_ptflags(unsigned int flags);
+
+void add_boot_mapping(unsigned int paddr, unsigned int vaddr,
+		 unsigned int size, unsigned int flags);
+void add_mapping_pgd(unsigned int paddr, unsigned int vaddr,
+		     unsigned int size, unsigned int flags,
+		     pgd_table_t *pgd);
+void add_mapping(unsigned int paddr, unsigned int vaddr,
+		 unsigned int size, unsigned int flags);
+void remove_mapping(unsigned long vaddr);
+void remove_mapping_pgd(unsigned long vaddr, pgd_table_t *pgd);
+void prealloc_phys_pagedesc(void);
+
+void copy_pgd_kern_all(pgd_table_t *);
+pte_t virt_to_pte(unsigned long virtual);
+pte_t virt_to_pte_from_pgd(unsigned long virtual, pgd_table_t *pgd);
+
+#endif /* __GLUE_ARM_MEMORY_H__ */
+