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/*
* Microblaze MMU emulation for qemu.
*
* Copyright (c) 2009 Edgar E. Iglesias
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#define MMU_R_PID 0
#define MMU_R_ZPR 1
#define MMU_R_TLBX 2
#define MMU_R_TLBLO 3
#define MMU_R_TLBHI 4
#define MMU_R_TLBSX 5
#define RAM_DATA 1
#define RAM_TAG 0
/* Tag portion */
#define TLB_EPN_MASK 0xFFFFFC00 /* Effective Page Number */
#define TLB_PAGESZ_MASK 0x00000380
#define TLB_PAGESZ(x) (((x) & 0x7) << 7)
#define PAGESZ_1K 0
#define PAGESZ_4K 1
#define PAGESZ_16K 2
#define PAGESZ_64K 3
#define PAGESZ_256K 4
#define PAGESZ_1M 5
#define PAGESZ_4M 6
#define PAGESZ_16M 7
#define TLB_VALID 0x00000040 /* Entry is valid */
/* Data portion */
#define TLB_RPN_MASK 0xFFFFFC00 /* Real Page Number */
#define TLB_PERM_MASK 0x00000300
#define TLB_EX 0x00000200 /* Instruction execution allowed */
#define TLB_WR 0x00000100 /* Writes permitted */
#define TLB_ZSEL_MASK 0x000000F0
#define TLB_ZSEL(x) (((x) & 0xF) << 4)
#define TLB_ATTR_MASK 0x0000000F
#define TLB_W 0x00000008 /* Caching is write-through */
#define TLB_I 0x00000004 /* Caching is inhibited */
#define TLB_M 0x00000002 /* Memory is coherent */
#define TLB_G 0x00000001 /* Memory is guarded from prefetch */
#define TLB_ENTRIES 64
struct microblaze_mmu
{
/* Data and tag brams. */
uint32_t rams[2][TLB_ENTRIES];
/* We keep a separate ram for the tids to avoid the 48 bit tag width. */
uint8_t tids[TLB_ENTRIES];
/* Control flops. */
uint32_t regs[8];
int c_mmu;
int c_mmu_tlb_access;
int c_mmu_zones;
};
struct microblaze_mmu_lookup
{
uint32_t paddr;
uint32_t vaddr;
unsigned int size;
unsigned int idx;
int prot;
enum {
ERR_PROT, ERR_MISS, ERR_HIT
} err;
};
void mmu_flip_um(CPUState *env, unsigned int um);
unsigned int mmu_translate(struct microblaze_mmu *mmu,
struct microblaze_mmu_lookup *lu,
target_ulong vaddr, int rw, int mmu_idx);
uint32_t mmu_read(CPUState *env, uint32_t rn);
void mmu_write(CPUState *env, uint32_t rn, uint32_t v);
void mmu_init(struct microblaze_mmu *mmu);