Hello, can you adjust the code below so it prints 8 horizontal stripes to the Bitmap display, this is coded using RISC-V. .text main: # set-up trap handler la s0,trap_handler csrw s0,utvec # set utvec = address of the handler # enable processing of interrup requests from timer li s1,0x10 csrw s1,uie # set uie = 0x10 # enable interrupts in CPU csrsi ustatus,1 # set interrupt enable bit in ustatus (0) # ask timer, which is part of Digital Lab Sim tool, # to generate interrupts every 30 instructions # (see Digital Lab Sim help file for detail) li s1, 0xffff0013 li s0, 1 sb s0, 0(s1) j process_1 # start running process_1 # only registers s0-s3 are saved as process context # and can be used by the process code. # --------------------------------------- process_1: li s1,0xffff0010 loop_1: li s0,0x3f sb s0,0(s1) li s0,0x06 sb s0,0(s1) li s0,0x5B sb s0,0(s1) li s0,0x4F sb s0,0(s1) j loop_1 # --------------------------------------- process_2: li s1,0xffff0011 loop_2: li s0,0x3f sb s0,0(s1) li s0,0x06 sb s0,0(s1) li s0,0x5B sb s0,0(s1) li s0,0x4F sb s0,0(s1) j loop_2 # --------------------------------------- trap_handler: # save process context (i.e. CPU registers) into the current trap frame csrw s0,uscratch # copy value of s0 into uscratch temporarily la s0, current_process_trap_frame lw s0, 0(s0) # load address of the current trap_frame into s0 sw s1, 8(s0) # save value of s1 into the trap frame sw s2,12(s0) # save value of s2 into the trap frame sw s3,16(s0) # save value of s3 into the trap frame csrr s1, uscratch # get value of s0 from uscratch into s1 sw s1, 4(s0) # save value of s0 into the trap frame csrr s1, uepc # get value of pc from uepc into s1 sw s1, 0(s0) # save value of pc into the trap frame # switch to the next process lw s1, 20(s0) # load address of the next trap frame to run la s0, current_process_trap_frame sw s1, 0(s0) # save it into the currernt trap frame pointer # restore process context (CPU registers) from the selected trap frame # and continue running mv s0,s1 # address of selected process trap frame in s0 lw s1,0(s0) # saved value of pc in s1 csrw s1,uepc # we put it to uepc for uret to consume lw s1,4(s0) # load saved value of s0 csrw s1,uscratch # put it to uscratch temporarily lw s1,8(s0) # restore saved value of s1 lw s2,12(s0) # restore saved value of s2 lw s3,16(s0) # restore saved value of s3 csrr s0,uscratch # restore s0 from uscratch uret # restore pc from uepc and continue running # selected process .data # Pointer to the trap frame corresponding to the currently running process current_process_trap_frame: .wordtrap_frame_1 # Different trap frames are used for storing contexts of # individual processes trap_frame_1: .word process_1 # pc (trap_frame + 0) - initialise to the starting address .word 0 # s0 (trap_frame + 4) .word 0 # s1 (trap_frame + 8) .word 0 # s2 (trap_frame + 12) .word 0 # s3 (trap_frame + 16) .word trap_frame_2 # next (trap_frame + 20) trap_frame_2: .word process_2 # pc (trap_frame + 0) - initialise to the starting address .word 0 # s0 (trap_frame + 4) .word 0 # s1 (trap_frame + 8) .word 0 # s2 (trap_frame + 12) .word 0 # s3 (trap_frame + 16) .word trap_frame_1 # next (trap_frame + 20)

Hello, can you adjust the code below so it prints 8 horizontal stripes to the Bitmap display, this is coded using RISC-V. .text main: # set-up trap handler la s0,trap_handler csrw s0,utvec # set utvec = address of the handler # enable processing of interrup requests from timer li s1,0x10 csrw s1,uie # set uie = 0x10 # enable interrupts in CPU csrsi ustatus,1 # set interrupt enable bit in ustatus (0) # ask timer, which is part of Digital Lab Sim tool, # to generate interrupts every 30 instructions # (see Digital Lab Sim help file for detail) li s1, 0xffff0013 li s0, 1 sb s0, 0(s1) j process_1 # start running process_1 # only registers s0-s3 are saved as process context # and can be used by the process code. # --------------------------------------- process_1: li s1,0xffff0010 loop_1: li s0,0x3f sb s0,0(s1) li s0,0x06 sb s0,0(s1) li s0,0x5B sb s0,0(s1) li s0,0x4F sb s0,0(s1) j loop_1 # --------------------------------------- process_2: li s1,0xffff0011 loop_2: li s0,0x3f sb s0,0(s1) li s0,0x06 sb s0,0(s1) li s0,0x5B sb s0,0(s1) li s0,0x4F sb s0,0(s1) j loop_2 # --------------------------------------- trap_handler: # save process context (i.e. CPU registers) into the current trap frame csrw s0,uscratch # copy value of s0 into uscratch temporarily la s0, current_process_trap_frame lw s0, 0(s0) # load address of the current trap_frame into s0 sw s1, 8(s0) # save value of s1 into the trap frame sw s2,12(s0) # save value of s2 into the trap frame sw s3,16(s0) # save value of s3 into the trap frame csrr s1, uscratch # get value of s0 from uscratch into s1 sw s1, 4(s0) # save value of s0 into the trap frame csrr s1, uepc # get value of pc from uepc into s1 sw s1, 0(s0) # save value of pc into the trap frame # switch to the next process lw s1, 20(s0) # load address of the next trap frame to run la s0, current_process_trap_frame sw s1, 0(s0) # save it into the currernt trap frame pointer # restore process context (CPU registers) from the selected trap frame # and continue running mv s0,s1 # address of selected process trap frame in s0 lw s1,0(s0) # saved value of pc in s1 csrw s1,uepc # we put it to uepc for uret to consume lw s1,4(s0) # load saved value of s0 csrw s1,uscratch # put it to uscratch temporarily lw s1,8(s0) # restore saved value of s1 lw s2,12(s0) # restore saved value of s2 lw s3,16(s0) # restore saved value of s3 csrr s0,uscratch # restore s0 from uscratch uret # restore pc from uepc and continue running # selected process .data # Pointer to the trap frame corresponding to the currently running process current_process_trap_frame: .wordtrap_frame_1 # Different trap frames are used for storing contexts of # individual processes trap_frame_1: .word process_1 # pc (trap_frame + 0) - initialise to the starting address .word 0 # s0 (trap_frame + 4) .word 0 # s1 (trap_frame + 8) .word 0 # s2 (trap_frame + 12) .word 0 # s3 (trap_frame + 16) .word trap_frame_2 # next (trap_frame + 20) trap_frame_2: .word process_2 # pc (trap_frame + 0) - initialise to the starting address .word 0 # s0 (trap_frame + 4) .word 0 # s1 (trap_frame + 8) .word 0 # s2 (trap_frame + 12) .word 0 # s3 (trap_frame + 16) .word trap_frame_1 # next (trap_frame + 20)

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter8: Data And Network Communication Technology

Section: Chapter Questions

Problem 41VE

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Question

Hello, can you adjust the code below so it prints 8 horizontal stripes to the Bitmap display, this is coded using RISC-V.

.text

main:

# set-up trap handler

la s0,trap_handler

csrw s0,utvec # set utvec = address of the handler

# enable processing of interrup requests from timer

li s1,0x10

csrw s1,uie # set uie = 0x10

# enable interrupts in CPU

csrsi ustatus,1 # set interrupt enable bit in ustatus (0)

# ask timer, which is part of Digital Lab Sim tool,

# to generate interrupts every 30 instructions

# (see Digital Lab Sim help file for detail)

li s1, 0xffff0013

li s0, 1

sb s0, 0(s1)

j process_1 # start running process_1

# only registers s0-s3 are saved as process context

# and can be used by the process code.

# ---------------------------------------

process_1:

li s1,0xffff0010

loop_1:

li s0,0x3f

sb s0,0(s1)

li s0,0x06

sb s0,0(s1)

li s0,0x5B

sb s0,0(s1)

li s0,0x4F

sb s0,0(s1)

j loop_1

# ---------------------------------------

process_2:

li s1,0xffff0011

loop_2:

li s0,0x3f

sb s0,0(s1)

li s0,0x06

sb s0,0(s1)

li s0,0x5B

sb s0,0(s1)

li s0,0x4F

sb s0,0(s1)

j loop_2

# ---------------------------------------

trap_handler:

# save process context (i.e. CPU registers) into the current trap frame

csrw s0,uscratch # copy value of s0 into uscratch temporarily

la s0, current_process_trap_frame

lw s0, 0(s0) # load address of the current trap_frame into s0

sw s1, 8(s0) # save value of s1 into the trap frame

sw s2,12(s0) # save value of s2 into the trap frame

sw s3,16(s0) # save value of s3 into the trap frame

csrr s1, uscratch # get value of s0 from uscratch into s1

sw s1, 4(s0) # save value of s0 into the trap frame

csrr s1, uepc # get value of pc from uepc into s1

sw s1, 0(s0) # save value of pc into the trap frame

# switch to the next process

lw s1, 20(s0) # load address of the next trap frame to run

la s0, current_process_trap_frame

sw s1, 0(s0) # save it into the currernt trap frame pointer

# restore process context (CPU registers) from the selected trap frame

# and continue running

mv s0,s1 # address of selected process trap frame in s0

lw s1,0(s0) # saved value of pc in s1

csrw s1,uepc # we put it to uepc for uret to consume

lw s1,4(s0) # load saved value of s0

csrw s1,uscratch # put it to uscratch temporarily

lw s1,8(s0) # restore saved value of s1

lw s2,12(s0) # restore saved value of s2

lw s3,16(s0) # restore saved value of s3

csrr s0,uscratch # restore s0 from uscratch

uret # restore pc from uepc and continue running

# selected process

.data

# Pointer to the trap frame corresponding to the currently running process

current_process_trap_frame:

.wordtrap_frame_1

# Different trap frames are used for storing contexts of

# individual processes

trap_frame_1:

.word process_1 # pc (trap_frame + 0) - initialise to the starting address

.word 0 # s0 (trap_frame + 4)

.word 0 # s1 (trap_frame + 8)

.word 0 # s2 (trap_frame + 12)

.word 0 # s3 (trap_frame + 16)

.word trap_frame_2 # next (trap_frame + 20)

trap_frame_2:

.word process_2 # pc (trap_frame + 0) - initialise to the starting address

.word 0 # s0 (trap_frame + 4)

.word 0 # s1 (trap_frame + 8)

.word 0 # s2 (trap_frame + 12)

.word 0 # s3 (trap_frame + 16)

.word trap_frame_1 # next (trap_frame + 20)

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