mirror of
https://github.com/drasko/codezero.git
synced 2026-01-11 18:33:16 +01:00
148 lines
4.3 KiB
C
148 lines
4.3 KiB
C
/*
|
|
* ARM v5-specific virtual memory details
|
|
*
|
|
* Copyright (C) 2007 Bahadir Balban
|
|
*/
|
|
#ifndef __V5_MM_H__
|
|
#define __V5_MM_H__
|
|
|
|
/* ARM specific definitions */
|
|
#define ARM_SECTION_SIZE SZ_1MB
|
|
#define ARM_SECTION_MASK (ARM_SECTION_SIZE - 1)
|
|
#define ARM_SECTION_BITS 20
|
|
#define ARM_PAGE_SIZE SZ_4K
|
|
#define ARM_PAGE_MASK 0xFFF
|
|
#define ARM_PAGE_BITS 12
|
|
|
|
#define PGD_SIZE SZ_4K * 4
|
|
#define PGD_ENTRY_TOTAL SZ_4K
|
|
#define PGD_TYPE_MASK 0x3
|
|
#define PGD_COARSE_ALIGN_MASK 0xFFFFFC00
|
|
#define PGD_SECTION_ALIGN_MASK 0xFFF00000
|
|
#define PGD_FINE_ALIGN_MASK 0xFFFFF000
|
|
#define PGD_TYPE_FAULT 0
|
|
#define PGD_TYPE_COARSE 1
|
|
#define PGD_TYPE_SECTION 2
|
|
#define PGD_TYPE_FINE 3
|
|
|
|
#define PMD_TYPE_MASK 0x3
|
|
#define PMD_TYPE_FAULT 0
|
|
#define PMD_TYPE_LARGE 1
|
|
#define PMD_TYPE_SMALL 2
|
|
#define PMD_TYPE_TINY 3
|
|
|
|
/* Permission field offsets */
|
|
#define SECTION_AP0 10
|
|
|
|
#define PMD_SIZE SZ_1K
|
|
#define PMD_ENTRY_TOTAL 256
|
|
#define PMD_MAP_SIZE SZ_1MB
|
|
|
|
/* Type-checkable page table elements */
|
|
typedef u32 pgd_t;
|
|
typedef u32 pmd_t;
|
|
typedef u32 pte_t;
|
|
|
|
/* Page global directory made up of pgd_t entries */
|
|
typedef struct pgd_table {
|
|
pgd_t entry[PGD_ENTRY_TOTAL];
|
|
} pgd_table_t;
|
|
|
|
/* Page middle directory made up of pmd_t entries */
|
|
typedef struct pmd_table {
|
|
pmd_t entry[PMD_ENTRY_TOTAL];
|
|
} pmd_table_t;
|
|
|
|
/* Applies for both small and large pages */
|
|
#define PAGE_AP0 4
|
|
#define PAGE_AP1 6
|
|
#define PAGE_AP2 8
|
|
#define PAGE_AP3 10
|
|
|
|
/* Permission values with rom and sys bits ignored */
|
|
#define SVC_RW_USR_NONE 1
|
|
#define SVC_RW_USR_RO 2
|
|
#define SVC_RW_USR_RW 3
|
|
|
|
#define PTE_PROT_MASK (0xFF << 4)
|
|
|
|
#define CACHEABILITY 3
|
|
#define BUFFERABILITY 2
|
|
#define cacheable (1 << CACHEABILITY)
|
|
#define bufferable (1 << BUFFERABILITY)
|
|
#define uncacheable 0
|
|
#define unbufferable 0
|
|
|
|
/* Helper macros for common cases */
|
|
#define __MAP_USR_RW_FLAGS (cacheable | bufferable | (SVC_RW_USR_RW << PAGE_AP0) \
|
|
| (SVC_RW_USR_RW << PAGE_AP1) | (SVC_RW_USR_RW << PAGE_AP2) \
|
|
| (SVC_RW_USR_RW << PAGE_AP3))
|
|
#define __MAP_USR_RO_FLAGS (cacheable | bufferable | (SVC_RW_USR_RO << PAGE_AP0) \
|
|
| (SVC_RW_USR_RO << PAGE_AP1) | (SVC_RW_USR_RO << PAGE_AP2) \
|
|
| (SVC_RW_USR_RO << PAGE_AP3))
|
|
#define __MAP_SVC_RW_FLAGS (cacheable | bufferable | (SVC_RW_USR_NONE << PAGE_AP0) \
|
|
| (SVC_RW_USR_NONE << PAGE_AP1) | (SVC_RW_USR_NONE << PAGE_AP2) \
|
|
| (SVC_RW_USR_NONE << PAGE_AP3))
|
|
#define __MAP_SVC_IO_FLAGS (uncacheable | unbufferable | (SVC_RW_USR_NONE << PAGE_AP0) \
|
|
| (SVC_RW_USR_NONE << PAGE_AP1) | (SVC_RW_USR_NONE << PAGE_AP2) \
|
|
| (SVC_RW_USR_NONE << PAGE_AP3))
|
|
#define __MAP_USR_IO_FLAGS (uncacheable | unbufferable | (SVC_RW_USR_RW << PAGE_AP0) \
|
|
| (SVC_RW_USR_RW << PAGE_AP1) | (SVC_RW_USR_RW << PAGE_AP2) \
|
|
| (SVC_RW_USR_RW << PAGE_AP3))
|
|
|
|
/* Abort information */
|
|
|
|
/*FIXME: Carry all these definitions to an abort.h, Also carry all abort code to abort.c. Much neater!!! */
|
|
|
|
/* Abort type */
|
|
#define ARM_PABT 1
|
|
#define ARM_DABT 0
|
|
/* The kernel makes use of bit 8 (Always Zero) of FSR to define which type of abort */
|
|
#define set_abort_type(fsr, x) { fsr &= ~(1 << 8); fsr |= ((x & 1) << 8); }
|
|
#define ARM_FSR_MASK 0xF
|
|
#define is_prefetch_abort(fsr) ((fsr >> 8) & 0x1)
|
|
#define is_data_abort(fsr) (!is_prefetch_abort(fsr))
|
|
|
|
/*
|
|
* v5 Architecture-defined data abort values for FSR ordered
|
|
* in highest to lowest priority.
|
|
*/
|
|
#define DABT_TERMINAL 0x2
|
|
#define DABT_VECTOR 0x0 /* Obsolete */
|
|
#define DABT_ALIGN 0x1
|
|
#define DABT_EXT_XLATE_LEVEL1 0xC
|
|
#define DABT_EXT_XLATE_LEVEL2 0xE
|
|
#define DABT_XLATE_SECT 0x5
|
|
#define DABT_XLATE_PAGE 0x7
|
|
#define DABT_DOMAIN_SECT 0x9
|
|
#define DABT_DOMAIN_PAGE 0xB
|
|
#define DABT_PERM_SECT 0xD
|
|
#define DABT_PERM_PAGE 0xF
|
|
#define DABT_EXT_LFETCH_SECT 0x4
|
|
#define DABT_EXT_LFETCH_PAGE 0x6
|
|
#define DABT_EXT_NON_LFETCH_SECT 0x8
|
|
#define DABT_EXT_NON_LFETCH_PAGE 0xA
|
|
|
|
|
|
/* Kernel's data about the fault */
|
|
typedef struct fault_kdata {
|
|
u32 faulty_pc;
|
|
u32 fsr;
|
|
u32 far;
|
|
pte_t pte;
|
|
} __attribute__ ((__packed__)) fault_kdata_t;
|
|
|
|
|
|
void add_section_mapping_init(unsigned int paddr, unsigned int vaddr,
|
|
unsigned int size, unsigned int flags);
|
|
|
|
void remap_as_pages(void *vstart, void *vend);
|
|
|
|
void relocate_page_tables(void);
|
|
void remove_section_mapping(unsigned long vaddr);
|
|
|
|
void copy_pgds_by_vrange(pgd_table_t *to, pgd_table_t *from,
|
|
unsigned long start, unsigned long end);
|
|
|
|
#endif /* __V5_MM_H__ */
|