mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
1d506c26d9
This commit is the result of the following actions:
- Running gdb/copyright.py to update all of the copyright headers to
include 2024,
- Manually updating a few files the copyright.py script told me to
update, these files had copyright headers embedded within the
file,
- Regenerating gdbsupport/Makefile.in to refresh it's copyright
date,
- Using grep to find other files that still mentioned 2023. If
these files were updated last year from 2022 to 2023 then I've
updated them this year to 2024.
I'm sure I've probably missed some dates. Feel free to fix them up as
you spot them.
593 lines
17 KiB
C
593 lines
17 KiB
C
/* Blackfin Memory Management Unit (MMU) model.
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Copyright (C) 2010-2024 Free Software Foundation, Inc.
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Contributed by Analog Devices, Inc.
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This file is part of simulators.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* This must come before any other includes. */
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#include "defs.h"
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#include "sim-main.h"
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#include "sim-options.h"
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#include "devices.h"
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#include "dv-bfin_mmu.h"
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#include "dv-bfin_cec.h"
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/* XXX: Should this really be two blocks of registers ? PRM describes
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these as two Content Addressable Memory (CAM) blocks. */
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struct bfin_mmu
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{
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bu32 base;
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/* Order after here is important -- matches hardware MMR layout. */
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bu32 sram_base_address;
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bu32 dmem_control, dcplb_fault_status, dcplb_fault_addr;
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char _dpad0[0x100 - 0x0 - (4 * 4)];
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bu32 dcplb_addr[16];
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char _dpad1[0x200 - 0x100 - (4 * 16)];
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bu32 dcplb_data[16];
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char _dpad2[0x300 - 0x200 - (4 * 16)];
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bu32 dtest_command;
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char _dpad3[0x400 - 0x300 - (4 * 1)];
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bu32 dtest_data[2];
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char _dpad4[0x1000 - 0x400 - (4 * 2)];
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bu32 idk; /* Filler MMR; hardware simply ignores. */
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bu32 imem_control, icplb_fault_status, icplb_fault_addr;
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char _ipad0[0x100 - 0x0 - (4 * 4)];
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bu32 icplb_addr[16];
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char _ipad1[0x200 - 0x100 - (4 * 16)];
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bu32 icplb_data[16];
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char _ipad2[0x300 - 0x200 - (4 * 16)];
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bu32 itest_command;
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char _ipad3[0x400 - 0x300 - (4 * 1)];
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bu32 itest_data[2];
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};
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#define mmr_base() offsetof(struct bfin_mmu, sram_base_address)
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#define mmr_offset(mmr) (offsetof(struct bfin_mmu, mmr) - mmr_base())
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#define mmr_idx(mmr) (mmr_offset (mmr) / 4)
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static const char * const mmr_names[BFIN_COREMMR_MMU_SIZE / 4] =
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{
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"SRAM_BASE_ADDRESS", "DMEM_CONTROL", "DCPLB_FAULT_STATUS", "DCPLB_FAULT_ADDR",
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[mmr_idx (dcplb_addr[0])] = "DCPLB_ADDR0",
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"DCPLB_ADDR1", "DCPLB_ADDR2", "DCPLB_ADDR3", "DCPLB_ADDR4", "DCPLB_ADDR5",
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"DCPLB_ADDR6", "DCPLB_ADDR7", "DCPLB_ADDR8", "DCPLB_ADDR9", "DCPLB_ADDR10",
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"DCPLB_ADDR11", "DCPLB_ADDR12", "DCPLB_ADDR13", "DCPLB_ADDR14", "DCPLB_ADDR15",
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[mmr_idx (dcplb_data[0])] = "DCPLB_DATA0",
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"DCPLB_DATA1", "DCPLB_DATA2", "DCPLB_DATA3", "DCPLB_DATA4", "DCPLB_DATA5",
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"DCPLB_DATA6", "DCPLB_DATA7", "DCPLB_DATA8", "DCPLB_DATA9", "DCPLB_DATA10",
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"DCPLB_DATA11", "DCPLB_DATA12", "DCPLB_DATA13", "DCPLB_DATA14", "DCPLB_DATA15",
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[mmr_idx (dtest_command)] = "DTEST_COMMAND",
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[mmr_idx (dtest_data[0])] = "DTEST_DATA0", "DTEST_DATA1",
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[mmr_idx (imem_control)] = "IMEM_CONTROL", "ICPLB_FAULT_STATUS", "ICPLB_FAULT_ADDR",
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[mmr_idx (icplb_addr[0])] = "ICPLB_ADDR0",
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"ICPLB_ADDR1", "ICPLB_ADDR2", "ICPLB_ADDR3", "ICPLB_ADDR4", "ICPLB_ADDR5",
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"ICPLB_ADDR6", "ICPLB_ADDR7", "ICPLB_ADDR8", "ICPLB_ADDR9", "ICPLB_ADDR10",
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"ICPLB_ADDR11", "ICPLB_ADDR12", "ICPLB_ADDR13", "ICPLB_ADDR14", "ICPLB_ADDR15",
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[mmr_idx (icplb_data[0])] = "ICPLB_DATA0",
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"ICPLB_DATA1", "ICPLB_DATA2", "ICPLB_DATA3", "ICPLB_DATA4", "ICPLB_DATA5",
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"ICPLB_DATA6", "ICPLB_DATA7", "ICPLB_DATA8", "ICPLB_DATA9", "ICPLB_DATA10",
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"ICPLB_DATA11", "ICPLB_DATA12", "ICPLB_DATA13", "ICPLB_DATA14", "ICPLB_DATA15",
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[mmr_idx (itest_command)] = "ITEST_COMMAND",
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[mmr_idx (itest_data[0])] = "ITEST_DATA0", "ITEST_DATA1",
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};
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#define mmr_name(off) (mmr_names[(off) / 4] ? : "<INV>")
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static bool bfin_mmu_skip_cplbs = false;
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static unsigned
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bfin_mmu_io_write_buffer (struct hw *me, const void *source,
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int space, address_word addr, unsigned nr_bytes)
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{
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struct bfin_mmu *mmu = hw_data (me);
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bu32 mmr_off;
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bu32 value;
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bu32 *valuep;
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/* Invalid access mode is higher priority than missing register. */
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if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, true))
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return 0;
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value = dv_load_4 (source);
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mmr_off = addr - mmu->base;
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valuep = (void *)((uintptr_t)mmu + mmr_base() + mmr_off);
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HW_TRACE_WRITE ();
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switch (mmr_off)
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{
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case mmr_offset(dmem_control):
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case mmr_offset(imem_control):
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/* XXX: IMC/DMC bit should add/remove L1 cache regions ... */
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case mmr_offset(dtest_data[0]) ... mmr_offset(dtest_data[1]):
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case mmr_offset(itest_data[0]) ... mmr_offset(itest_data[1]):
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case mmr_offset(dcplb_addr[0]) ... mmr_offset(dcplb_addr[15]):
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case mmr_offset(dcplb_data[0]) ... mmr_offset(dcplb_data[15]):
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case mmr_offset(icplb_addr[0]) ... mmr_offset(icplb_addr[15]):
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case mmr_offset(icplb_data[0]) ... mmr_offset(icplb_data[15]):
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*valuep = value;
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break;
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case mmr_offset(sram_base_address):
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case mmr_offset(dcplb_fault_status):
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case mmr_offset(dcplb_fault_addr):
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case mmr_offset(idk):
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case mmr_offset(icplb_fault_status):
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case mmr_offset(icplb_fault_addr):
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/* Discard writes to these. */
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break;
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case mmr_offset(itest_command):
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/* XXX: Not supported atm. */
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if (value)
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hw_abort (me, "ITEST_COMMAND unimplemented");
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break;
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case mmr_offset(dtest_command):
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/* Access L1 memory indirectly. */
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*valuep = value;
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if (value)
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{
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bu32 sram_addr = mmu->sram_base_address |
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((value >> (26 - 11)) & (1 << 11)) | /* addr bit 11 (Way0/Way1) */
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((value >> (24 - 21)) & (1 << 21)) | /* addr bit 21 (Data/Inst) */
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((value >> (23 - 15)) & (1 << 15)) | /* addr bit 15 (Data Bank) */
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((value >> (16 - 12)) & (3 << 12)) | /* addr bits 13:12 (Subbank) */
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(value & 0x47F8); /* addr bits 14 & 10:3 */
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if (!(value & TEST_DATA_ARRAY))
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hw_abort (me, "DTEST_COMMAND tag array unimplemented");
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if (value & 0xfa7cb801)
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hw_abort (me, "DTEST_COMMAND bits undefined");
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if (value & TEST_WRITE)
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sim_write (hw_system (me), sram_addr, mmu->dtest_data, 8);
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else
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sim_read (hw_system (me), sram_addr, mmu->dtest_data, 8);
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}
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break;
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default:
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dv_bfin_mmr_invalid (me, addr, nr_bytes, true);
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return 0;
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}
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return nr_bytes;
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}
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static unsigned
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bfin_mmu_io_read_buffer (struct hw *me, void *dest,
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int space, address_word addr, unsigned nr_bytes)
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{
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struct bfin_mmu *mmu = hw_data (me);
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bu32 mmr_off;
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bu32 *valuep;
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/* Invalid access mode is higher priority than missing register. */
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if (!dv_bfin_mmr_require_32 (me, addr, nr_bytes, false))
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return 0;
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mmr_off = addr - mmu->base;
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valuep = (void *)((uintptr_t)mmu + mmr_base() + mmr_off);
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HW_TRACE_READ ();
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switch (mmr_off)
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{
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case mmr_offset(dmem_control):
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case mmr_offset(imem_control):
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case mmr_offset(dtest_command):
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case mmr_offset(dtest_data[0]) ... mmr_offset(dtest_data[2]):
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case mmr_offset(itest_command):
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case mmr_offset(itest_data[0]) ... mmr_offset(itest_data[2]):
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/* XXX: should do something here. */
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case mmr_offset(dcplb_addr[0]) ... mmr_offset(dcplb_addr[15]):
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case mmr_offset(dcplb_data[0]) ... mmr_offset(dcplb_data[15]):
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case mmr_offset(icplb_addr[0]) ... mmr_offset(icplb_addr[15]):
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case mmr_offset(icplb_data[0]) ... mmr_offset(icplb_data[15]):
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case mmr_offset(sram_base_address):
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case mmr_offset(dcplb_fault_status):
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case mmr_offset(dcplb_fault_addr):
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case mmr_offset(idk):
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case mmr_offset(icplb_fault_status):
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case mmr_offset(icplb_fault_addr):
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dv_store_4 (dest, *valuep);
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break;
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default:
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dv_bfin_mmr_invalid (me, addr, nr_bytes, false);
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return 0;
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}
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return nr_bytes;
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}
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static void
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attach_bfin_mmu_regs (struct hw *me, struct bfin_mmu *mmu)
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{
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address_word attach_address;
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int attach_space;
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unsigned attach_size;
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reg_property_spec reg;
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if (hw_find_property (me, "reg") == NULL)
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hw_abort (me, "Missing \"reg\" property");
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if (!hw_find_reg_array_property (me, "reg", 0, ®))
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hw_abort (me, "\"reg\" property must contain three addr/size entries");
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hw_unit_address_to_attach_address (hw_parent (me),
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®.address,
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&attach_space, &attach_address, me);
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hw_unit_size_to_attach_size (hw_parent (me), ®.size, &attach_size, me);
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if (attach_size != BFIN_COREMMR_MMU_SIZE)
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hw_abort (me, "\"reg\" size must be %#x", BFIN_COREMMR_MMU_SIZE);
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hw_attach_address (hw_parent (me),
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0, attach_space, attach_address, attach_size, me);
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mmu->base = attach_address;
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}
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static void
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bfin_mmu_finish (struct hw *me)
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{
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struct bfin_mmu *mmu;
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mmu = HW_ZALLOC (me, struct bfin_mmu);
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set_hw_data (me, mmu);
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set_hw_io_read_buffer (me, bfin_mmu_io_read_buffer);
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set_hw_io_write_buffer (me, bfin_mmu_io_write_buffer);
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attach_bfin_mmu_regs (me, mmu);
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/* Initialize the MMU. */
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mmu->sram_base_address = 0xff800000 - 0;
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/*(4 * 1024 * 1024 * CPU_INDEX (hw_system_cpu (me)));*/
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mmu->dmem_control = 0x00000001;
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mmu->imem_control = 0x00000001;
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}
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const struct hw_descriptor dv_bfin_mmu_descriptor[] =
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{
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{"bfin_mmu", bfin_mmu_finish,},
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{NULL, NULL},
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};
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/* Device option parsing. */
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static DECLARE_OPTION_HANDLER (bfin_mmu_option_handler);
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enum {
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OPTION_MMU_SKIP_TABLES = OPTION_START,
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};
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static const OPTION bfin_mmu_options[] =
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{
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{ {"mmu-skip-cplbs", no_argument, NULL, OPTION_MMU_SKIP_TABLES },
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'\0', NULL, "Skip parsing of CPLB tables (big speed increase)",
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bfin_mmu_option_handler, NULL },
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{ {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL, NULL }
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};
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static SIM_RC
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bfin_mmu_option_handler (SIM_DESC sd, sim_cpu *current_cpu, int opt,
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char *arg, int is_command)
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{
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switch (opt)
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{
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case OPTION_MMU_SKIP_TABLES:
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bfin_mmu_skip_cplbs = true;
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return SIM_RC_OK;
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default:
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sim_io_eprintf (sd, "Unknown Blackfin MMU option %d\n", opt);
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return SIM_RC_FAIL;
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}
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}
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/* Provide a prototype to silence -Wmissing-prototypes. */
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extern MODULE_INIT_FN sim_install_bfin_mmu;
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SIM_RC
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sim_install_bfin_mmu (SIM_DESC sd)
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{
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SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);
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return sim_add_option_table (sd, NULL, bfin_mmu_options);
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}
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#define MMU_STATE(cpu) DV_STATE_CACHED (cpu, mmu)
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static void
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_mmu_log_ifault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 pc, bool supv)
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{
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mmu->icplb_fault_addr = pc;
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mmu->icplb_fault_status = supv << 17;
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}
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void
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mmu_log_ifault (SIM_CPU *cpu)
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{
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_mmu_log_ifault (cpu, MMU_STATE (cpu), PCREG, cec_get_ivg (cpu) >= 0);
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}
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static void
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_mmu_log_fault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 addr, bool write,
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bool inst, bool miss, bool supv, bool dag1, bu32 faults)
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{
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bu32 *fault_status, *fault_addr;
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/* No logging in non-OS mode. */
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if (!mmu)
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return;
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fault_status = inst ? &mmu->icplb_fault_status : &mmu->dcplb_fault_status;
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fault_addr = inst ? &mmu->icplb_fault_addr : &mmu->dcplb_fault_addr;
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/* ICPLB regs always get updated. */
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if (!inst)
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_mmu_log_ifault (cpu, mmu, PCREG, supv);
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*fault_addr = addr;
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*fault_status =
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(miss << 19) |
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(dag1 << 18) |
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(supv << 17) |
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(write << 16) |
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faults;
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}
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static void
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_mmu_process_fault (SIM_CPU *cpu, struct bfin_mmu *mmu, bu32 addr, bool write,
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bool inst, bool unaligned, bool miss, bool supv, bool dag1)
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{
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int excp;
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/* See order in mmu_check_addr() */
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if (unaligned)
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excp = inst ? VEC_MISALI_I : VEC_MISALI_D;
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else if (addr >= BFIN_SYSTEM_MMR_BASE)
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excp = VEC_ILL_RES;
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else if (!mmu)
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excp = inst ? VEC_CPLB_I_M : VEC_CPLB_M;
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else
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{
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/* Misses are hardware errors. */
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cec_hwerr (cpu, HWERR_EXTERN_ADDR);
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return;
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}
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_mmu_log_fault (cpu, mmu, addr, write, inst, miss, supv, dag1, 0);
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cec_exception (cpu, excp);
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}
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void
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mmu_process_fault (SIM_CPU *cpu, bu32 addr, bool write, bool inst,
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bool unaligned, bool miss)
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{
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SIM_DESC sd = CPU_STATE (cpu);
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struct bfin_mmu *mmu;
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if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT)
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mmu = NULL;
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else
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mmu = MMU_STATE (cpu);
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_mmu_process_fault (cpu, mmu, addr, write, inst, unaligned, miss,
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cec_is_supervisor_mode (cpu),
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BFIN_CPU_STATE.multi_pc == PCREG + 6);
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}
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/* Return values:
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-2: no known problems
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-1: valid
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0: miss
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1: protection violation
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2: multiple hits
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3: unaligned
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4: miss; hwerr */
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static int
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mmu_check_implicit_addr (SIM_CPU *cpu, bu32 addr, bool inst, int size,
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bool supv, bool dag1)
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{
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bool l1 = ((addr & 0xFF000000) == 0xFF000000);
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bu32 amask = (addr & 0xFFF00000);
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if (addr & (size - 1))
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return 3;
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/* MMRs may never be executable or accessed from usermode. */
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if (addr >= BFIN_SYSTEM_MMR_BASE)
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{
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if (inst)
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return 0;
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else if (!supv || dag1)
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return 1;
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else
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return -1;
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}
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else if (inst)
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{
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/* Some regions are not executable. */
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/* XXX: Should this be in the model data ? Core B 561 ? */
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if (l1)
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return (amask == 0xFFA00000) ? -1 : 1;
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}
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else
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{
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/* Some regions are not readable. */
|
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/* XXX: Should this be in the model data ? Core B 561 ? */
|
||
if (l1)
|
||
return (amask != 0xFFA00000) ? -1 : 4;
|
||
}
|
||
|
||
return -2;
|
||
}
|
||
|
||
/* Exception order per the PRM (first has highest):
|
||
Inst Multiple CPLB Hits
|
||
Inst Misaligned Access
|
||
Inst Protection Violation
|
||
Inst CPLB Miss
|
||
Only the alignment matters in non-OS mode though. */
|
||
static int
|
||
_mmu_check_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst, int size)
|
||
{
|
||
SIM_DESC sd = CPU_STATE (cpu);
|
||
struct bfin_mmu *mmu;
|
||
bu32 *mem_control, *cplb_addr, *cplb_data;
|
||
bu32 faults;
|
||
bool supv, do_excp, dag1;
|
||
int i, hits;
|
||
|
||
supv = cec_is_supervisor_mode (cpu);
|
||
dag1 = (BFIN_CPU_STATE.multi_pc == PCREG + 6);
|
||
|
||
if (STATE_ENVIRONMENT (sd) != OPERATING_ENVIRONMENT || bfin_mmu_skip_cplbs)
|
||
{
|
||
int ret = mmu_check_implicit_addr (cpu, addr, inst, size, supv, dag1);
|
||
/* Valid hits and misses are OK in non-OS envs. */
|
||
if (ret < 0)
|
||
return 0;
|
||
_mmu_process_fault (cpu, NULL, addr, write, inst, (ret == 3), false, supv, dag1);
|
||
}
|
||
|
||
mmu = MMU_STATE (cpu);
|
||
mem_control = inst ? &mmu->imem_control : &mmu->dmem_control;
|
||
cplb_addr = inst ? &mmu->icplb_addr[0] : &mmu->dcplb_addr[0];
|
||
cplb_data = inst ? &mmu->icplb_data[0] : &mmu->dcplb_data[0];
|
||
|
||
faults = 0;
|
||
hits = 0;
|
||
do_excp = false;
|
||
|
||
/* CPLBs disabled -> little to do. */
|
||
if (!(*mem_control & ENCPLB))
|
||
{
|
||
hits = 1;
|
||
goto implicit_check;
|
||
}
|
||
|
||
/* Check all the CPLBs first. */
|
||
for (i = 0; i < 16; ++i)
|
||
{
|
||
const bu32 pages[4] = { 0x400, 0x1000, 0x100000, 0x400000 };
|
||
bu32 addr_lo, addr_hi;
|
||
|
||
/* Skip invalid entries. */
|
||
if (!(cplb_data[i] & CPLB_VALID))
|
||
continue;
|
||
|
||
/* See if this entry covers this address. */
|
||
addr_lo = cplb_addr[i];
|
||
addr_hi = cplb_addr[i] + pages[(cplb_data[i] & PAGE_SIZE) >> 16];
|
||
if (addr < addr_lo || addr >= addr_hi)
|
||
continue;
|
||
|
||
++hits;
|
||
faults |= (1 << i);
|
||
if (write)
|
||
{
|
||
if (!supv && !(cplb_data[i] & CPLB_USER_WR))
|
||
do_excp = true;
|
||
if (supv && !(cplb_data[i] & CPLB_SUPV_WR))
|
||
do_excp = true;
|
||
if ((cplb_data[i] & (CPLB_WT | CPLB_L1_CHBL | CPLB_DIRTY)) == CPLB_L1_CHBL)
|
||
do_excp = true;
|
||
}
|
||
else
|
||
{
|
||
if (!supv && !(cplb_data[i] & CPLB_USER_RD))
|
||
do_excp = true;
|
||
}
|
||
}
|
||
|
||
/* Handle default/implicit CPLBs. */
|
||
if (!do_excp && hits < 2)
|
||
{
|
||
int ihits;
|
||
implicit_check:
|
||
ihits = mmu_check_implicit_addr (cpu, addr, inst, size, supv, dag1);
|
||
switch (ihits)
|
||
{
|
||
/* No faults and one match -> good to go. */
|
||
case -1: return 0;
|
||
case -2:
|
||
if (hits == 1)
|
||
return 0;
|
||
break;
|
||
case 4:
|
||
cec_hwerr (cpu, HWERR_EXTERN_ADDR);
|
||
return 0;
|
||
default:
|
||
hits = ihits;
|
||
}
|
||
}
|
||
else
|
||
/* Normalize hit count so hits==2 is always multiple hit exception. */
|
||
hits = min (2, hits);
|
||
|
||
_mmu_log_fault (cpu, mmu, addr, write, inst, hits == 0, supv, dag1, faults);
|
||
|
||
if (inst)
|
||
{
|
||
int iexcps[] = { VEC_CPLB_I_M, VEC_CPLB_I_VL, VEC_CPLB_I_MHIT, VEC_MISALI_I };
|
||
return iexcps[hits];
|
||
}
|
||
else
|
||
{
|
||
int dexcps[] = { VEC_CPLB_M, VEC_CPLB_VL, VEC_CPLB_MHIT, VEC_MISALI_D };
|
||
return dexcps[hits];
|
||
}
|
||
}
|
||
|
||
void
|
||
mmu_check_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst, int size)
|
||
{
|
||
int excp = _mmu_check_addr (cpu, addr, write, inst, size);
|
||
if (excp)
|
||
cec_exception (cpu, excp);
|
||
}
|
||
|
||
void
|
||
mmu_check_cache_addr (SIM_CPU *cpu, bu32 addr, bool write, bool inst)
|
||
{
|
||
bu32 cacheaddr;
|
||
int excp;
|
||
|
||
cacheaddr = addr & ~(BFIN_L1_CACHE_BYTES - 1);
|
||
excp = _mmu_check_addr (cpu, cacheaddr, write, inst, BFIN_L1_CACHE_BYTES);
|
||
if (excp == 0)
|
||
return;
|
||
|
||
/* Most exceptions are ignored with cache funcs. */
|
||
/* XXX: Not sure if we should be ignoring CPLB misses. */
|
||
if (inst)
|
||
{
|
||
if (excp == VEC_CPLB_I_VL)
|
||
return;
|
||
}
|
||
else
|
||
{
|
||
if (excp == VEC_CPLB_VL)
|
||
return;
|
||
}
|
||
cec_exception (cpu, excp);
|
||
}
|