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https://github.com/openhwgroup/cvw
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430 lines
12 KiB
ArmAsm
430 lines
12 KiB
ArmAsm
///////////////////////////////////////////
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// tlbNAPOT.S
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//
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// Written: mmendozamanriquez@hmc.edu 4 April 2023
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// nlimpert@hmc.edu
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// Adapted David_Harris@hmc.edu 8/29/23 to exercise NAPOT huge pages
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//
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// Purpose: Test coverage for LSU NAPOT
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//
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// A component of the CORE-V-WALLY configurable RISC-V project.
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//
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// Copyright (C) 2021-23 Harvey Mudd College & Oklahoma State University
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//
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// SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
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//
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// Licensed under the Solderpad Hardware License v 2.1 (the “License”); you may not use this file
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// except in compliance with the License, or, at your option, the Apache License version 2.0. You
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// may obtain a copy of the License at
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//
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// https://solderpad.org/licenses/SHL-2.1/
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//
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// Unless required by applicable law or agreed to in writing, any work distributed under the
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// License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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////////////////////////////////////////////////////////////////////////////////////////////////
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// load code to initalize stack, handle interrupts, terminate
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#include "WALLY-init-lib.h"
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# run-elf.bash find this in project description
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main:
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li t5, 0x1
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slli t5, t5, 62
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csrs menvcfg, t5
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# Page table root address at 0x80010000; SV48
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li t5, 0x9000000000080010
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csrw satp, t5
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# sfence.vma x0, x0
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# switch to supervisor mode
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li a0, 1
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ecall
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li t4, 0x200000 # address step size
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li a2, 0x80215240 # Test NAPOT pages
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jal a1, looptest
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li a2, 0xC0215240 # Test ill-formed NAPOT pages
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jal a1, looptest
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li a2, 0x40215240 # Test properly formed pages with 1 in PPN[3] that are not NAPOT
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jal a1, looptest
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li t4, 0x1000 # address step size
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li a2, 0x80216000 # Test NAPOT pages
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jal a1, looptest
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li a0, 3 # switch back to machine mode because code at 0x80000000 may not have clean page table entry
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ecall
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j done
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looptest:
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mv t0, a2 # base address
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li t2, 0 # i = 0
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li t3, 35 # Max amount of Loops = 34
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li t5, 0x8082 # return instruction opcode
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loop: bge t2, t3, finished # exit loop if i >= loops
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sw t5, 0(t0) # store a return at this address to exercise DTLB
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lw t1, 0(t0) # read it back
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fence.i # synchronize with I$
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jal changetoipfhandler # set up trap handler to return from instruction page fault if necessary
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jalr ra, t0 # jump to the return statement to exercise the ITLB
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jal changetodefaulthandler
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add t0, t0, t4
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addi t2, t2, 1
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j loop
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finished:
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jr a1
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changetoipfhandler:
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li a0, 3
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ecall # switch to machine mode
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la a0, ipf_handler
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csrw mtvec, a0 # point to new handler
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li a0, 1
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ecall # switch back to supervisor mode
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ret
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changetodefaulthandler:
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li a0, 3
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ecall # switch to machine mode
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la a0, trap_handler
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csrw mtvec, a0 # point to new handler
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li a0, 1
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ecall # switch back to supervisor mode
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ret
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instructionpagefaulthandler:
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csrw mepc, ra # go back to calling function
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mret
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.align 4 # trap handlers must be aligned to multiple of 4
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ipf_handler:
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# Load trap handler stack pointer tp
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csrrw tp, mscratch, tp # swap MSCRATCH and tp
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sd t0, 0(tp) # Save t0 and t1 on the stack
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sd t1, -8(tp)
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csrr t0, mcause # Check the cause
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li t1, 8 # is it an ecall trap?
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andi t0, t0, 0xFC # if CAUSE = 8, 9, or 11
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beq t0, t1, ecall # yes, take ecall
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csrr t0, mcause
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li t1, 12 # is it an instruction page fault
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beq t0, t1, ipf # yes, return to calling function
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j trap_return
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ipf:
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csrw mepc, ra # return to calling function
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ld t1, -8(tp) # restore t1 and t0
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ld t0, 0(tp)
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csrrw tp, mscratch, tp # restore tp
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mret # return from trap
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.data
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.align 16
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# root Page table situated at 0x80010000
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pagetable:
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.8byte 0x200044C1 // old page table was 200040 which just pointed to itself! wrong
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# next page table at 0x80011000
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.align 12
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.8byte 0x0000000000000000 # gigapage at 0x00000000
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.8byte 0x00000000200058C1 # gigapage at 0x40000000 used for non-NAPOT with PPN bit 3 set
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.8byte 0x00000000200048C1 # gigapage at 0x80000000 used for testing NAPOT huge pages
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.8byte 0x00000000200050C1 # gigapage at 0xC0000000 mapped to ill-formed NAPOT with wrong PPN
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# Next page table at 0x80012000 for gigapage at 0x80000000
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.align 12
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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.8byte 0x0000000020004CC1
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# Leaf page table at 0x80013000 with NAPOT pages
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.align 12
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#80000000
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0xA0000000200020CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x80000000200060CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000A0CF
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.8byte 0x800000002000E0CF
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.8byte 0x800000002000E0CF
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.8byte 0x800000002000E0CF
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.8byte 0x800000002000E0CF
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.8byte 0x800000002000E0CF
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.8byte 0x800000002000E0CF
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# Next page table at 0x80014000: mega-sized, pointing to malformed NAPOT for gigapage at 0xC9000000
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.align 12
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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.8byte 0x00000000200054C1
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# Leaf page table at 0x80015000 with malformed NAPOT pages (wrong PPN) starting at 0xC0000000
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.align 12
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#80000000
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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.8byte 0x80000000200000CF
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# Next page table at 0x80016000: mega-sized, pointing to properly formed PTE with 1 in PPN bit 3 for gigapage at 0x40000000
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.align 12
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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.8byte 0x0000000020005CC1
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# Leaf page table at 0x80017000 with properly formed PTE with bit 4 of PPN set but no NAPOT
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.align 12
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#80000000
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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.8byte 0x00000000200020CF
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.8byte 0x00000000200060CF
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.8byte 0x000000002000A0CF
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.8byte 0x000000002000E0CF
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