230 lines
7.2 KiB
C
230 lines
7.2 KiB
C
/*
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* common defines for all CPUs
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*
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* Copyright (c) 2003 Fabrice Bellard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef CPU_DEFS_H
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#define CPU_DEFS_H
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#ifndef NEED_CPU_H
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#error cpu.h included from common code
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#endif
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#include "qemu/host-utils.h"
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#include "qemu/thread.h"
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#include "tcg-target.h"
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#include "exec/hwaddr.h"
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#include "exec/memattrs.h"
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#include "hw/core/cpu.h"
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#include "cpu-param.h"
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#ifndef TARGET_LONG_BITS
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# error TARGET_LONG_BITS must be defined in cpu-param.h
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#endif
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#ifndef NB_MMU_MODES
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# error NB_MMU_MODES must be defined in cpu-param.h
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#endif
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#ifndef TARGET_PHYS_ADDR_SPACE_BITS
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# error TARGET_PHYS_ADDR_SPACE_BITS must be defined in cpu-param.h
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#endif
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#ifndef TARGET_VIRT_ADDR_SPACE_BITS
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# error TARGET_VIRT_ADDR_SPACE_BITS must be defined in cpu-param.h
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#endif
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#ifndef TARGET_PAGE_BITS
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# ifdef TARGET_PAGE_BITS_VARY
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# ifndef TARGET_PAGE_BITS_MIN
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# error TARGET_PAGE_BITS_MIN must be defined in cpu-param.h
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# endif
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# else
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# error TARGET_PAGE_BITS must be defined in cpu-param.h
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# endif
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#endif
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#define TARGET_LONG_SIZE (TARGET_LONG_BITS / 8)
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/* target_ulong is the type of a virtual address */
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#if TARGET_LONG_SIZE == 4
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typedef int32_t target_long;
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typedef uint32_t target_ulong;
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#define TARGET_FMT_lx "%08x"
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#define TARGET_FMT_ld "%d"
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#define TARGET_FMT_lu "%u"
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#elif TARGET_LONG_SIZE == 8
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typedef int64_t target_long;
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typedef uint64_t target_ulong;
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#define TARGET_FMT_lx "%016" PRIx64
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#define TARGET_FMT_ld "%" PRId64
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#define TARGET_FMT_lu "%" PRIu64
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#else
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#error TARGET_LONG_SIZE undefined
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#endif
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/* use a fully associative victim tlb of 8 entries */
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#define CPU_VTLB_SIZE 8
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#if HOST_LONG_BITS == 32 && TARGET_LONG_BITS == 32
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#define CPU_TLB_ENTRY_BITS 4
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#else
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#define CPU_TLB_ENTRY_BITS 5
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#endif
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#define CPU_TLB_DYN_MIN_BITS 6
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#define CPU_TLB_DYN_DEFAULT_BITS 8
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# if HOST_LONG_BITS == 32
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/* Make sure we do not require a double-word shift for the TLB load */
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# define CPU_TLB_DYN_MAX_BITS (32 - TARGET_PAGE_BITS)
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# else /* HOST_LONG_BITS == 64 */
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/*
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* Assuming TARGET_PAGE_BITS==12, with 2**22 entries we can cover 2**(22+12) ==
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* 2**34 == 16G of address space. This is roughly what one would expect a
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* TLB to cover in a modern (as of 2018) x86_64 CPU. For instance, Intel
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* Skylake's Level-2 STLB has 16 1G entries.
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* Also, make sure we do not size the TLB past the guest's address space.
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*/
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# define CPU_TLB_DYN_MAX_BITS \
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MIN(22, TARGET_VIRT_ADDR_SPACE_BITS - TARGET_PAGE_BITS)
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# endif
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typedef struct CPUTLBEntry {
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/* bit TARGET_LONG_BITS to TARGET_PAGE_BITS : virtual address
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bit TARGET_PAGE_BITS-1..4 : Nonzero for accesses that should not
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go directly to ram.
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bit 3 : indicates that the entry is invalid
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bit 2..0 : zero
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*/
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union {
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struct {
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target_ulong addr_read;
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target_ulong addr_write;
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target_ulong addr_code;
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/* Addend to virtual address to get host address. IO accesses
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use the corresponding iotlb value. */
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uintptr_t addend;
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};
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/* padding to get a power of two size */
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uint8_t dummy[1 << CPU_TLB_ENTRY_BITS];
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};
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} CPUTLBEntry;
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QEMU_BUILD_BUG_ON(sizeof(CPUTLBEntry) != (1 << CPU_TLB_ENTRY_BITS));
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/* The IOTLB is not accessed directly inline by generated TCG code,
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* so the CPUIOTLBEntry layout is not as critical as that of the
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* CPUTLBEntry. (This is also why we don't want to combine the two
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* structs into one.)
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*/
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typedef struct CPUIOTLBEntry {
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/*
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* @addr contains:
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* - in the lower TARGET_PAGE_BITS, a physical section number
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* - with the lower TARGET_PAGE_BITS masked off, an offset which
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* must be added to the virtual address to obtain:
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* + the ram_addr_t of the target RAM (if the physical section
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* number is PHYS_SECTION_NOTDIRTY or PHYS_SECTION_ROM)
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* + the offset within the target MemoryRegion (otherwise)
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*/
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hwaddr addr;
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MemTxAttrs attrs;
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} CPUIOTLBEntry;
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/*
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* Data elements that are per MMU mode, minus the bits accessed by
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* the TCG fast path.
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*/
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typedef struct CPUTLBDesc {
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/*
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* Describe a region covering all of the large pages allocated
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* into the tlb. When any page within this region is flushed,
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* we must flush the entire tlb. The region is matched if
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* (addr & large_page_mask) == large_page_addr.
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*/
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target_ulong large_page_addr;
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target_ulong large_page_mask;
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/* host time (in ns) at the beginning of the time window */
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int64_t window_begin_ns;
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/* maximum number of entries observed in the window */
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size_t window_max_entries;
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size_t n_used_entries;
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/* The next index to use in the tlb victim table. */
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size_t vindex;
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/* The tlb victim table, in two parts. */
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CPUTLBEntry vtable[CPU_VTLB_SIZE];
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CPUIOTLBEntry viotlb[CPU_VTLB_SIZE];
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/* The iotlb. */
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CPUIOTLBEntry *iotlb;
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} CPUTLBDesc;
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/*
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* Data elements that are per MMU mode, accessed by the fast path.
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* The structure is aligned to aid loading the pair with one insn.
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*/
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typedef struct CPUTLBDescFast {
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/* Contains (n_entries - 1) << CPU_TLB_ENTRY_BITS */
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uintptr_t mask;
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/* The array of tlb entries itself. */
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CPUTLBEntry *table;
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} CPUTLBDescFast QEMU_ALIGNED(2 * sizeof(void *));
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/*
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* Data elements that are shared between all MMU modes.
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*/
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typedef struct CPUTLBCommon {
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/*
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* Within dirty, for each bit N, modifications have been made to
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* mmu_idx N since the last time that mmu_idx was flushed.
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* Protected by tlb_c.lock.
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*/
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uint16_t dirty;
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/*
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* Statistics. These are not lock protected, but are read and
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* written atomically. This allows the monitor to print a snapshot
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* of the stats without interfering with the cpu.
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*/
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size_t full_flush_count;
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size_t part_flush_count;
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size_t elide_flush_count;
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} CPUTLBCommon;
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/*
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* The entire softmmu tlb, for all MMU modes.
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* The meaning of each of the MMU modes is defined in the target code.
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* Since this is placed within CPUNegativeOffsetState, the smallest
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* negative offsets are at the end of the struct.
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*/
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typedef struct CPUTLB {
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CPUTLBCommon c;
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CPUTLBDesc d[NB_MMU_MODES];
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CPUTLBDescFast f[NB_MMU_MODES];
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} CPUTLB;
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/* This will be used by TCG backends to compute offsets. */
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#define TLB_MASK_TABLE_OFS(IDX) \
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((int)offsetof(ArchCPU, neg.tlb.f[IDX]) - (int)offsetof(ArchCPU, env))
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/*
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* This structure must be placed in ArchCPU immediately
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* before CPUArchState, as a field named "neg".
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*/
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typedef struct CPUNegativeOffsetState {
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CPUTLB tlb;
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IcountDecr icount_decr;
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} CPUNegativeOffsetState;
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#endif
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