rearraged files, set up to use grub bootloader
This commit is contained in:
9
.gitignore
vendored
9
.gitignore
vendored
@@ -1,8 +1,11 @@
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*.iso
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isodir
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sysroot
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*.img
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*.o
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*.bin
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*.elf
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.idea
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.vscode
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build
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build
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isodir
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14
boot/boot.ld
14
boot/boot.ld
@@ -1,14 +0,0 @@
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ENTRY(_start)
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SECTIONS
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{
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. = 0x7C00;
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.text : {
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*(.text)
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}
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.data : {
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*(.data)
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}
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}
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129
boot/boot.s
129
boot/boot.s
@@ -1,129 +0,0 @@
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.code16
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.text
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.global _start
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_start:
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ljmp $0x07C0, $something
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something:
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cli
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cld
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mov %cs, %ax
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mov %ax, %ds
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mov %ax, %es
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# stack stuff
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mov $0x0000, %ax
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mov %ax, %ss
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mov $0xFFF0, %sp
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# copy the first 12 bytes of our MBR table entry
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mov %dl, (disk_number)
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mov $mbr_entry, %di
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mov $12, %cx
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rep movsb
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mov $0, %ah
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int $0x13
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mov $0x08, %ah
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int $0x13
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and 0b00111111, %cl
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mov %cl, (total_sectors)
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mov %ch, (total_cylinders)
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mov %dh, (total_heads)
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mov $0x1000, %ax
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mov %ax, %es
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mov $0x0000, %bx
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mov (disk_number), %dl
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mov $0, %ch #cylinder
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mov $0, %dh #head
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mov $2, %cl #sector
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load_sector:
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mov $1, %al
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mov $0x02, %ah
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int $0x13
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mov (kernel_sectors), %ax
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cmp $0xffff, %ax
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jne check_last_sector
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mov %es:20, %eax
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shr $9, %eax
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inc %eax
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check_last_sector:
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dec %ax
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mov %ax, kernel_sectors
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cmp $0, %ax
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je done
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move: # inc our offset. If it hits 0, we've moved a segment, inc that too.
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add $512, %bx
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cmp $0, %bx
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jnz read_next_sector
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mov %es, %ax
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add $1000, %ax
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mov %ax, %es
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read_next_sector: # find the next valid sector, head, cylinder combo on the disk
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inc %cl
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mov (total_sectors), %al
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cmp %al, %cl
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jle load_sector
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mov $1, %cl #go back to sector 1.. of the next head
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inc %dh #next head
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mov (total_heads), %al
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cmp %al, %dh
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jle load_sector
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mov $0, %dh # go back to head 0.. of the next cylinder
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inc %ch # next cylinder
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mov (total_cylinders), %al
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cmp %al, %ch
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jle load_sector
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# no more disk... fall through
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done:
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mov $0, %ah
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int $0x13
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mov $0x1000, %ax
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mov %ax, %ds
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ljmp $0x1000, $0x0000
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disk_number:
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.byte 0
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total_cylinders:
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.byte 0
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total_heads:
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.byte 0
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total_sectors:
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.byte 0
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kernel_sectors:
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.word 0xFFFF
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mbr_entry:
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partition_status:
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.byte 0
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partition_start_chs:
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.byte 0
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.byte 0
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.byte 0
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partition_type:
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.byte 0
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partition_stop_chs:
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.byte 0
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.byte 0
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.byte 0
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partition_start_lba:
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.long 0
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partition_start_length:
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.long 0
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.org 510
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magic:
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.word 0xAA55
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@@ -1,45 +1,19 @@
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[
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{
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"file": "boot.s",
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"file": "kernel/kmain.c",
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"arguments": [
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"/home/slinky/opt/cross/bin/i686-elf-gcc",
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"-m32",
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"-c",
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"boot.s",
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"kernel/kmain.c",
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"-o",
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"boot.o"
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],
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"directory": "/home/slinky/source/RockOS",
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"output": "boot.o"
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},
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{
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"file": "prekernel.s",
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"arguments": [
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"/home/slinky/opt/cross/bin/i686-elf-gcc",
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"-m32",
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"-c",
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"prekernel.s",
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"-o",
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"prekernel.o"
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],
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"directory": "/home/slinky/source/RockOS",
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"output": "prekernel.o"
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},
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{
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"file": "kmain.c",
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"arguments": [
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"/home/slinky/opt/cross/bin/i686-elf-gcc",
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"-m32",
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"obj/kernel/kmain.o",
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"-ffreestanding",
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"-O2",
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"-Wall",
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"-Wextra",
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"-c",
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"kmain.c",
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"-o",
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"kmain.o"
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"-Ikernel"
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],
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"directory": "/home/slinky/source/RockOS",
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"output": "kmain.o"
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"output": "obj/kernel/kmain.o"
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}
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]
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28
kernel/boot/boot.s
Normal file
28
kernel/boot/boot.s
Normal file
@@ -0,0 +1,28 @@
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.set ALIGN, 1<<0 /* align loaded modules on page boundaries */
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.set MEMINFO, 1<<1 /* provide memory map */
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.set FLAGS, ALIGN | MEMINFO /* this is the Multiboot 'flag' field */
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.set MAGIC, 0x1BADB002 /* 'magic number' lets bootloader find the header */
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.set CHECKSUM, -(MAGIC + FLAGS) /* checksum of above, to prove we are multiboot */
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.section .multiboot
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.align 4
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.long MAGIC
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.long FLAGS
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.long CHECKSUM
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.section .bss
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.align 16
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stack_bottom:
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.skip 16384 # 16 KiB
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stack_top:
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.section .text
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.global _start
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.type _start, @function
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_start:
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mov $stack_top, %esp
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call kernel_main
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cli
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1: hlt
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jmp 1b
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72
kernel/drivers/vga_stream_writer.c
Normal file
72
kernel/drivers/vga_stream_writer.c
Normal file
@@ -0,0 +1,72 @@
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#include <stddef.h>
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#include <stdint.h>
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#include <lib/stream.h>
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#define VGA_WIDTH 80
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#define VGA_HEIGHT 25
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#define VGA_MEMORY 0xB8000
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enum vga_color {
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VGA_COLOR_BLACK = 0,
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VGA_COLOR_BLUE = 1,
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VGA_COLOR_GREEN = 2,
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VGA_COLOR_CYAN = 3,
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VGA_COLOR_RED = 4,
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VGA_COLOR_MAGENTA = 5,
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VGA_COLOR_BROWN = 6,
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VGA_COLOR_LIGHT_GREY = 7,
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VGA_COLOR_DARK_GREY = 8,
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VGA_COLOR_LIGHT_BLUE = 9,
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VGA_COLOR_LIGHT_GREEN = 10,
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VGA_COLOR_LIGHT_CYAN = 11,
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VGA_COLOR_LIGHT_RED = 12,
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VGA_COLOR_LIGHT_MAGENTA = 13,
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VGA_COLOR_LIGHT_BROWN = 14,
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VGA_COLOR_WHITE = 15,
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};
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size_t terminal_row;
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size_t terminal_column;
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uint8_t terminal_color;
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uint16_t* terminal_buffer = (uint16_t*)VGA_MEMORY;
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static inline uint8_t vga_entry_color(enum vga_color fg, enum vga_color bg)
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{
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return fg | bg << 4;
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}
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static inline uint16_t vga_entry(unsigned char uc, uint8_t color)
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{
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return (uint16_t) uc | (uint16_t) color << 8;
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}
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void vga_initialize()
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{
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terminal_row = 0;
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terminal_column = 0;
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terminal_color = vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
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for (size_t y = 0; y < VGA_HEIGHT; y++) {
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for (size_t x = 0; x < VGA_WIDTH; x++) {
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const size_t index = y * VGA_WIDTH + x;
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terminal_buffer[index] = vga_entry(' ', terminal_color);
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}
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}
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}
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void vga_putchar(char c)
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{
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const size_t index = terminal_row * VGA_WIDTH + terminal_column;
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terminal_buffer[index] = vga_entry(c, terminal_color);
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if (++terminal_column == VGA_WIDTH) {
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terminal_column = 0;
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if (++terminal_row == VGA_HEIGHT)
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terminal_row = 0;
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}
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}
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|
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print_stream_t vga_print_stream = {
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.putchar = vga_putchar,
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.trunc = vga_initialize,
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};
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62
kernel/gdt.c
Normal file
62
kernel/gdt.c
Normal file
@@ -0,0 +1,62 @@
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#include <stdint.h>
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|
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#define SEG_DESCTYPE(x) ((x) << 0x04) // Descriptor type (0 for system, 1 for code/data)
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#define SEG_PRES(x) ((x) << 0x07) // Present
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#define SEG_SAVL(x) ((x) << 0x0C) // Available for system use
|
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#define SEG_LONG(x) ((x) << 0x0D) // Long mode
|
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#define SEG_SIZE(x) ((x) << 0x0E) // Size (0 for 16-bit, 1 for 32)
|
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#define SEG_GRAN(x) ((x) << 0x0F) // Granularity (0 for 1B - 1MB, 1 for 4KB - 4GB)
|
||||
#define SEG_PRIV(x) (((x) & 0x03) << 0x05) // Set privilege level (0 - 3)
|
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|
||||
#define SEG_DATA_RD 0x00 // Read-Only
|
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#define SEG_DATA_RDA 0x01 // Read-Only, accessed
|
||||
#define SEG_DATA_RDWR 0x02 // Read/Write
|
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#define SEG_DATA_RDWRA 0x03 // Read/Write, accessed
|
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#define SEG_DATA_RDEXPD 0x04 // Read-Only, expand-down
|
||||
#define SEG_DATA_RDEXPDA 0x05 // Read-Only, expand-down, accessed
|
||||
#define SEG_DATA_RDWREXPD 0x06 // Read/Write, expand-down
|
||||
#define SEG_DATA_RDWREXPDA 0x07 // Read/Write, expand-down, accessed
|
||||
#define SEG_CODE_EX 0x08 // Execute-Only
|
||||
#define SEG_CODE_EXA 0x09 // Execute-Only, accessed
|
||||
#define SEG_CODE_EXRD 0x0A // Execute/Read
|
||||
#define SEG_CODE_EXRDA 0x0B // Execute/Read, accessed
|
||||
#define SEG_CODE_EXC 0x0C // Execute-Only, conforming
|
||||
#define SEG_CODE_EXCA 0x0D // Execute-Only, conforming, accessed
|
||||
#define SEG_CODE_EXRDC 0x0E // Execute/Read, conforming
|
||||
#define SEG_CODE_EXRDCA 0x0F // Execute/Read, conforming, accessed
|
||||
|
||||
#define GDT_CODE_PL0 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \
|
||||
SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \
|
||||
SEG_PRIV(0) | SEG_CODE_EXRD
|
||||
|
||||
#define GDT_DATA_PL0 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \
|
||||
SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \
|
||||
SEG_PRIV(0) | SEG_DATA_RDWR
|
||||
|
||||
#define GDT_CODE_PL3 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \
|
||||
SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \
|
||||
SEG_PRIV(3) | SEG_CODE_EXRD
|
||||
|
||||
#define GDT_DATA_PL3 SEG_DESCTYPE(1) | SEG_PRES(1) | SEG_SAVL(0) | \
|
||||
SEG_LONG(0) | SEG_SIZE(1) | SEG_GRAN(1) | \
|
||||
SEG_PRIV(3) | SEG_DATA_RDWR
|
||||
|
||||
uint64_t create_descriptor(uint32_t base, uint32_t limit, uint16_t flag)
|
||||
{
|
||||
uint64_t descriptor;
|
||||
|
||||
// Create the high 32 bit segment
|
||||
descriptor = limit & 0x000F0000; // set limit bits 19:16
|
||||
descriptor |= (flag << 8) & 0x00F0FF00; // set type, p, dpl, s, g, d/b, l and avl fields
|
||||
descriptor |= (base >> 16) & 0x000000FF; // set base bits 23:16
|
||||
descriptor |= base & 0xFF000000; // set base bits 31:24
|
||||
|
||||
// Shift by 32 to allow for low part of segment
|
||||
descriptor <<= 32;
|
||||
|
||||
// Create the low 32 bit segment
|
||||
descriptor |= base << 16; // set base bits 15:0
|
||||
descriptor |= limit & 0x0000FFFF; // set limit bits 15:0
|
||||
|
||||
return descriptor;
|
||||
}
|
||||
3
kernel/globals.c
Normal file
3
kernel/globals.c
Normal file
@@ -0,0 +1,3 @@
|
||||
#include <lib/stream.h>
|
||||
|
||||
print_stream_t* kout;
|
||||
@@ -1,24 +0,0 @@
|
||||
ENTRY(_start)
|
||||
|
||||
SECTIONS
|
||||
{
|
||||
. = 0x10000;
|
||||
|
||||
.text : {
|
||||
*(.text)
|
||||
}
|
||||
|
||||
.rodata : {
|
||||
*(.rodata)
|
||||
}
|
||||
|
||||
.data : {
|
||||
*(.data)
|
||||
}
|
||||
|
||||
.bss : {
|
||||
*(.bss)
|
||||
}
|
||||
|
||||
_end = .;
|
||||
}
|
||||
@@ -1,28 +1,12 @@
|
||||
#include <stdint.h>
|
||||
#include <lib/print.h>
|
||||
#include <lib/stream.h>
|
||||
|
||||
extern void halt();
|
||||
extern void idt_load();
|
||||
extern void reboot();
|
||||
void kernel_main(void)
|
||||
{
|
||||
extern print_stream_t vga_print_stream;
|
||||
extern print_stream_t* kout;
|
||||
kout = &vga_print_stream;
|
||||
kout->trunc();
|
||||
|
||||
typedef struct {
|
||||
uint16_t offset_low;
|
||||
uint16_t selector;
|
||||
uint8_t zero;
|
||||
uint8_t flags;
|
||||
uint16_t offset_high;
|
||||
} idt_entry_t __attribute__((packed));
|
||||
|
||||
typedef struct {
|
||||
uint16_t limit;
|
||||
uint32_t base;
|
||||
} idt_ptr_t;
|
||||
|
||||
idt_entry_t idt[256];
|
||||
idt_ptr_t idtr;
|
||||
|
||||
void load_idt() {}
|
||||
|
||||
void kmain() {
|
||||
load_idt();
|
||||
halt();
|
||||
kprint("RockOS booting...");
|
||||
}
|
||||
|
||||
11
kernel/lib/print.c
Normal file
11
kernel/lib/print.c
Normal file
@@ -0,0 +1,11 @@
|
||||
#include "print.h"
|
||||
#include "stream.h"
|
||||
|
||||
extern print_stream_t* kout;
|
||||
|
||||
void kprint(const char *str) {
|
||||
while (*str) {
|
||||
kout->putchar(*str);
|
||||
str++;
|
||||
}
|
||||
}
|
||||
6
kernel/lib/print.h
Normal file
6
kernel/lib/print.h
Normal file
@@ -0,0 +1,6 @@
|
||||
#ifndef KLIBPRINT_H
|
||||
#define KLIBPRINT_H
|
||||
|
||||
void kprint(const char* str);
|
||||
|
||||
#endif
|
||||
3
kernel/lib/stream.c
Normal file
3
kernel/lib/stream.c
Normal file
@@ -0,0 +1,3 @@
|
||||
#include "stream.h"
|
||||
|
||||
print_stream_t* pout;
|
||||
9
kernel/lib/stream.h
Normal file
9
kernel/lib/stream.h
Normal file
@@ -0,0 +1,9 @@
|
||||
#ifndef KSTREAM_H
|
||||
#define KSTREAM_H
|
||||
|
||||
typedef struct {
|
||||
void (*putchar)(char c);
|
||||
void (*trunc)();
|
||||
} print_stream_t;
|
||||
|
||||
#endif
|
||||
28
kernel/linker.ld
Normal file
28
kernel/linker.ld
Normal file
@@ -0,0 +1,28 @@
|
||||
ENTRY(_start)
|
||||
|
||||
SECTIONS
|
||||
{
|
||||
. = 2M;
|
||||
|
||||
.text BLOCK(4K) : ALIGN(4K)
|
||||
{
|
||||
*(.multiboot)
|
||||
*(.text)
|
||||
}
|
||||
|
||||
.rodata BLOCK(4K) : ALIGN(4K)
|
||||
{
|
||||
*(.rodata)
|
||||
}
|
||||
|
||||
.data BLOCK(4K) : ALIGN(4K)
|
||||
{
|
||||
*(.data)
|
||||
}
|
||||
|
||||
.bss BLOCK(4K) : ALIGN(4K)
|
||||
{
|
||||
*(COMMON)
|
||||
*(.bss)
|
||||
}
|
||||
}
|
||||
@@ -1,118 +0,0 @@
|
||||
.code16
|
||||
.text
|
||||
.global _start
|
||||
_start:
|
||||
jmp everything
|
||||
|
||||
.org 20
|
||||
.global kernel_size
|
||||
kernel_size:
|
||||
.long _end - _start
|
||||
|
||||
everything:
|
||||
mov $0x1000, %ax
|
||||
mov %ax, %es
|
||||
mov %ax, %ds
|
||||
|
||||
# reset disk
|
||||
mov $0, %ah
|
||||
int $0x13
|
||||
|
||||
# stop the cursor
|
||||
mov $1, %ah
|
||||
mov $0,%cl
|
||||
mov $0x20,%ch
|
||||
int $0x11
|
||||
|
||||
# get the system memory, if this call fails then halt
|
||||
clc
|
||||
mov $0, %bx
|
||||
mov $0xe801, %ax
|
||||
int $0x15
|
||||
jc halt
|
||||
shr $10, %ax
|
||||
shr $4, %bx
|
||||
add %ax, %bx
|
||||
mov %bx, total_mem_mb-_start
|
||||
|
||||
# vga text mode
|
||||
mov $0x0003, %ax
|
||||
int $0x10
|
||||
|
||||
enable_a20:
|
||||
#enable the a20 gate
|
||||
inb $0x92, %al
|
||||
orb $2, %al
|
||||
outb %al, $0x92
|
||||
prep_protected:
|
||||
cli
|
||||
lgdt gdt_init-_start
|
||||
mov %cr0, %eax
|
||||
or $0x01, %eax
|
||||
mov %eax, %cr0 # protected bit set
|
||||
ljmpl $8, $protected
|
||||
|
||||
halt16:
|
||||
jmp halt16
|
||||
|
||||
.code32
|
||||
protected:
|
||||
mov $16, %ax
|
||||
mov %ax, %es
|
||||
mov %ax, %ds
|
||||
mov %ax, %ss
|
||||
mov $5*8, %ax
|
||||
ltr %ax
|
||||
mov $0, %ax
|
||||
mov %ax, %fs
|
||||
mov %ax, %gs
|
||||
mov $0xFFF0, %sp
|
||||
mov $0xFFF0, %bp
|
||||
ljmpl $8, $kmain
|
||||
|
||||
# some assembly stubs we can call from the kernel
|
||||
|
||||
.global idt_load
|
||||
.extern idtr
|
||||
idt_load:
|
||||
lidt idtr
|
||||
ret
|
||||
|
||||
.global reboot
|
||||
reboot:
|
||||
cli
|
||||
lidt reboot_struct
|
||||
int $1
|
||||
reboot_struct:
|
||||
.word 0
|
||||
.long 0
|
||||
|
||||
.global halt
|
||||
halt:
|
||||
cli
|
||||
hlt
|
||||
jmp halt
|
||||
|
||||
# kernel data structures
|
||||
|
||||
.align 16
|
||||
.global gdt
|
||||
gdt:
|
||||
.word 0,0,0,0
|
||||
.word 0xffff, 0x0000, 0x9a00, 0x00cf
|
||||
.word 0xffff, 0x0000, 0x9200, 0x00cf
|
||||
.word 0xffff, 0x0000, 0xfa00, 0x00cf
|
||||
.word 0xffff, 0x0000, 0xf200, 0x00cf
|
||||
.word 0x0068, (tss-_start), 0x8901, 0x00cf
|
||||
gdt_init:
|
||||
.word gdt_init-gdt
|
||||
.long gdt
|
||||
|
||||
.align 16
|
||||
.global tss
|
||||
tss:
|
||||
.long 0
|
||||
|
||||
.global total_mem_mb
|
||||
total_mem_mb:
|
||||
.word 0
|
||||
67
makefile
67
makefile
@@ -1,55 +1,38 @@
|
||||
CC = i686-elf-gcc
|
||||
LD = i686-elf-ld
|
||||
OBJCOPY = i686-elf-objcopy
|
||||
|
||||
CFLAGS = -m32 -ffreestanding -O2 -Wall -Wextra -nostdlib
|
||||
ASFLAGS = -m32
|
||||
OSNAME := rockos
|
||||
|
||||
BOOT_DIR := boot
|
||||
KERNEL_DIR := kernel
|
||||
BUILD_DIR := build
|
||||
C_SOURCES := $(shell find kernel -type f -name '*.c')
|
||||
S_SOURCES := $(shell find kernel -type f -name '*.s')
|
||||
|
||||
BOOT_BIN := $(BUILD_DIR)/boot.bin
|
||||
KERNEL_BIN := $(BUILD_DIR)/kernel.bin
|
||||
IMAGE := os.img
|
||||
OBJECTS := $(patsubst %.c, obj/%.o, $(C_SOURCES)) $(patsubst %.s, obj/%.o, $(S_SOURCES))
|
||||
|
||||
.PHONY: all clean run
|
||||
CFLAGS := -ffreestanding -O2 -Wall -Wextra -Ikernel
|
||||
LDFLAGS := -T kernel/linker.ld
|
||||
|
||||
all: $(IMAGE)
|
||||
.PHONY: all run clean
|
||||
|
||||
$(BUILD_DIR)/%.o: $(BOOT_DIR)/%.s | $(BUILD_DIR)
|
||||
$(CC) $(ASFLAGS) -c $< -o $@
|
||||
$(OSNAME).bin: $(OBJECTS)
|
||||
$(LD) $(LDFLAGS) -o $@ $(OBJECTS)
|
||||
|
||||
$(BUILD_DIR)/%.o: $(KERNEL_DIR)/%.s | $(BUILD_DIR)
|
||||
$(CC) $(ASFLAGS) -c $< -o $@
|
||||
$(OSNAME).iso: $(OSNAME).bin grub.cfg
|
||||
mkdir -p isodir/boot/grub
|
||||
cp $(OSNAME).bin isodir/boot/$(OSNAME)
|
||||
cp grub.cfg isodir/boot/grub/grub.cfg
|
||||
grub-mkrescue -o $(OSNAME).iso isodir
|
||||
|
||||
$(BUILD_DIR)/%.o: $(KERNEL_DIR)/%.c | $(BUILD_DIR)
|
||||
$(CC) $(CFLAGS) -c $< -o $@
|
||||
obj/%.o: %.c
|
||||
@mkdir -p $(dir $@)
|
||||
$(CC) -c $< -o $@ $(CFLAGS)
|
||||
|
||||
$(BUILD_DIR)/boot.elf: $(BUILD_DIR)/boot.o $(BOOT_DIR)/boot.ld
|
||||
$(LD) -T $(BOOT_DIR)/boot.ld -o $@ $(BUILD_DIR)/boot.o
|
||||
obj/%.o: %.s
|
||||
@mkdir -p $(dir $@)
|
||||
$(CC) -c $< -o $@ $(CFLAGS)
|
||||
|
||||
$(BOOT_BIN): $(BUILD_DIR)/boot.elf
|
||||
$(OBJCOPY) -O binary $< $@
|
||||
run: $(OSNAME).iso
|
||||
qemu-system-i386 -cdrom $(OSNAME).iso
|
||||
|
||||
KERNEL_OBJS := $(BUILD_DIR)/prekernel.o $(BUILD_DIR)/kmain.o
|
||||
|
||||
$(BUILD_DIR)/kernel.elf: $(KERNEL_OBJS) $(KERNEL_DIR)/kernel.ld
|
||||
$(LD) -T $(KERNEL_DIR)/kernel.ld -o $@ $(KERNEL_OBJS)
|
||||
|
||||
$(KERNEL_BIN): $(BUILD_DIR)/kernel.elf
|
||||
$(OBJCOPY) -O binary $< $@
|
||||
|
||||
$(BUILD_DIR):
|
||||
mkdir -p $(BUILD_DIR)
|
||||
|
||||
$(IMAGE): $(BOOT_BIN) $(KERNEL_BIN)
|
||||
dd if=$(BOOT_BIN) of=$@ bs=512 count=1
|
||||
dd if=$(KERNEL_BIN) of=$@ bs=512 seek=1
|
||||
truncate -s 1440k $@
|
||||
|
||||
run: $(IMAGE)
|
||||
qemu-system-i386 -drive format=raw,file=$(IMAGE)
|
||||
|
||||
clean:
|
||||
rm -rf $(BUILD_DIR) $(IMAGE)
|
||||
clean:
|
||||
@echo "Cleaning up build artifacts..."
|
||||
rm -rf $(OSNAME).iso $(OSNAME).bin obj isodir
|
||||
Reference in New Issue
Block a user