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/*
* common defines for all CPUs
*
* Copyright (c) 2003 Fabrice Bellard
*
* 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/>.
*/
#ifndef CPU_DEFS_H
#define CPU_DEFS_H
#ifndef NEED_CPU_H
#error cpu.h included from common code
#endif
#include "qemu/host-utils.h"
#include "qemu/queue.h"
#include "tcg-target.h"
#ifndef CONFIG_USER_ONLY
#include "exec/hwaddr.h"
#endif
#include "exec/memattrs.h"
#ifndef TARGET_LONG_BITS
#error TARGET_LONG_BITS must be defined before including this header
#endif
#define TARGET_LONG_SIZE (TARGET_LONG_BITS / 8)
/* target_ulong is the type of a virtual address */
#if TARGET_LONG_SIZE == 4
typedef int32_t target_long;
typedef uint32_t target_ulong;
#define TARGET_FMT_lx "%08x"
#define TARGET_FMT_ld "%d"
#define TARGET_FMT_lu "%u"
#elif TARGET_LONG_SIZE == 8
typedef int64_t target_long;
typedef uint64_t target_ulong;
#define TARGET_FMT_lx "%016" PRIx64
#define TARGET_FMT_ld "%" PRId64
#define TARGET_FMT_lu "%" PRIu64
#else
#error TARGET_LONG_SIZE undefined
#endif
#if !defined(CONFIG_USER_ONLY)
/* use a fully associative victim tlb of 8 entries */
#define CPU_VTLB_SIZE 8
#if HOST_LONG_BITS == 32 && TARGET_LONG_BITS == 32
#define CPU_TLB_ENTRY_BITS 4
#else
#define CPU_TLB_ENTRY_BITS 5
#endif
/* TCG_TARGET_TLB_DISPLACEMENT_BITS is used in CPU_TLB_BITS to ensure that
* the TLB is not unnecessarily small, but still small enough for the
* TLB lookup instruction sequence used by the TCG target.
*
* TCG will have to generate an operand as large as the distance between
* env and the tlb_table[NB_MMU_MODES - 1][0].addend. For simplicity,
* the TCG targets just round everything up to the next power of two, and
* count bits. This works because: 1) the size of each TLB is a largish
* power of two, 2) and because the limit of the displacement is really close
* to a power of two, 3) the offset of tlb_table[0][0] inside env is smaller
* than the size of a TLB.
*
* For example, the maximum displacement 0xFFF0 on PPC and MIPS, but TCG
* just says "the displacement is 16 bits". TCG_TARGET_TLB_DISPLACEMENT_BITS
* then ensures that tlb_table at least 0x8000 bytes large ("not unnecessarily
* small": 2^15). The operand then will come up smaller than 0xFFF0 without
* any particular care, because the TLB for a single MMU mode is larger than
* 0x10000-0xFFF0=16 bytes. In the end, the maximum value of the operand
* could be something like 0xC000 (the offset of the last TLB table) plus
* 0x18 (the offset of the addend field in each TLB entry) plus the offset
* of tlb_table inside env (which is non-trivial but not huge).
*/
#define CPU_TLB_BITS \
MIN(8, \
TCG_TARGET_TLB_DISPLACEMENT_BITS - CPU_TLB_ENTRY_BITS - \
(NB_MMU_MODES <= 1 ? 0 : \
NB_MMU_MODES <= 2 ? 1 : \
NB_MMU_MODES <= 4 ? 2 : \
NB_MMU_MODES <= 8 ? 3 : 4))
#define CPU_TLB_SIZE (1 << CPU_TLB_BITS)
typedef struct CPUTLBEntry {
/* bit TARGET_LONG_BITS to TARGET_PAGE_BITS : virtual address
bit TARGET_PAGE_BITS-1..4 : Nonzero for accesses that should not
go directly to ram.
bit 3 : indicates that the entry is invalid
bit 2..0 : zero
*/
union {
struct {
target_ulong addr_read;
target_ulong addr_write;
target_ulong addr_code;
/* Addend to virtual address to get host address. IO accesses
use the corresponding iotlb value. */
uintptr_t addend;
};
/* padding to get a power of two size */
uint8_t dummy[1 << CPU_TLB_ENTRY_BITS];
};
} CPUTLBEntry;
QEMU_BUILD_BUG_ON(sizeof(CPUTLBEntry) != (1 << CPU_TLB_ENTRY_BITS));
/* The IOTLB is not accessed directly inline by generated TCG code,
* so the CPUIOTLBEntry layout is not as critical as that of the
* CPUTLBEntry. (This is also why we don't want to combine the two
* structs into one.)
*/
typedef struct CPUIOTLBEntry {
hwaddr addr;
MemTxAttrs attrs;
} CPUIOTLBEntry;
#define CPU_COMMON_TLB \
/* The meaning of the MMU modes is defined in the target code. */ \
CPUTLBEntry tlb_table[NB_MMU_MODES][CPU_TLB_SIZE]; \
CPUTLBEntry tlb_v_table[NB_MMU_MODES][CPU_VTLB_SIZE]; \
CPUIOTLBEntry iotlb[NB_MMU_MODES][CPU_TLB_SIZE]; \
CPUIOTLBEntry iotlb_v[NB_MMU_MODES][CPU_VTLB_SIZE]; \
target_ulong tlb_flush_addr; \
target_ulong tlb_flush_mask; \
target_ulong vtlb_index; \
#else
#define CPU_COMMON_TLB
#endif
#define CPU_COMMON \
/* soft mmu support */ \
CPU_COMMON_TLB \
#endif
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