path: root/src/core/arm/interpreter/mmu/tlb.h

#ifndef _MMU_TLB_H_
#define _MMU_TLB_H_

typedef enum tlb_mapping_t
{
    TLB_INVALID = 0,
    TLB_SMALLPAGE = 1,
    TLB_LARGEPAGE = 2,
    TLB_SECTION = 3,
    TLB_ESMALLPAGE = 4,
    TLB_TINYPAGE = 5
} tlb_mapping_t;

extern ARMword tlb_masks[];

/* Permissions bits in a TLB entry:
 *
 *         31         12 11 10  9  8  7  6  5  4  3   2   1   0
 *        +-------------+-----+-----+-----+-----+---+---+-------+
 * Page:|             | ap3 | ap2 | ap1 | ap0 | C | B |       |
 *        +-------------+-----+-----+-----+-----+---+---+-------+
 *
 *         31         12 11 10  9              4  3   2   1   0
 *            +-------------+-----+-----------------+---+---+-------+
 * Section:    |             |  AP |                 | C | B |       |
 *            +-------------+-----+-----------------+---+---+-------+
 */

/*
section:
    section base address    [31:20]
    AP            - table 8-2, page 8-8
    domain
    C,B

page:
    page base address    [31:16] or [31:12]
    ap[3:0]
    domain (from L1)
    C,B
*/


typedef struct tlb_entry_t
{
    ARMword virt_addr;
    ARMword phys_addr;
    ARMword perms;
    ARMword domain;
    tlb_mapping_t mapping;
} tlb_entry_t;

typedef struct tlb_s
{
    int num;        /*num of tlb entry */
    int cycle;        /*current tlb cycle */
    tlb_entry_t *entrys;
} tlb_s;


#define tlb_c_flag(tlb) \
    ((tlb)->perms & 0x8)
#define tlb_b_flag(tlb) \
    ((tlb)->perms & 0x4)

#define  tlb_va_to_pa(tlb, va) \
(\
 {\
    ARMword mask = tlb_masks[tlb->mapping];      \
    (tlb->phys_addr & mask) | (va & ~mask);\
 }\
)

fault_t
check_access (ARMul_State * state, ARMword virt_addr, tlb_entry_t * tlb,
          int read);

fault_t
translate (ARMul_State * state, ARMword virt_addr, tlb_s * tlb_t,
       tlb_entry_t ** tlb);

int mmu_tlb_init (tlb_s * tlb_t, int num);

void mmu_tlb_exit (tlb_s * tlb_t);

void mmu_tlb_invalidate_all (ARMul_State * state, tlb_s * tlb_t);

void
mmu_tlb_invalidate_entry (ARMul_State * state, tlb_s * tlb_t, ARMword addr);

tlb_entry_t *mmu_tlb_search (ARMul_State * state, tlb_s * tlb_t,
                 ARMword virt_addr);

#endif        /*_MMU_TLB_H_*/