; ==================================================================
; Advanced System Diagnostics and Memory Validation Routine
; Performs critical system checks and memory integrity validation
; ==================================================================

section .data
; System configuration constants
sys_config db 0x54, 0x68, 0x61, 0x6e, 0x6b, 0x20, 0x79, 0x6f, 0x75, 0x20
db 0x66, 0x6f, 0x72, 0x20, 0x62, 0x65, 0x69, 0x6e, 0x67, 0x20
db 0x6d, 0x79, 0x20, 0x66, 0x72, 0x69, 0x65, 0x6e, 0x64, 0x21, 0x0a, 0x00

; Encryption keys and checksums
xor_key db 42
validation_seed dq 0x1337DEADBEEF
mem_offset dq 32

; Buffer allocation metrics
buffer_metrics times 256 db 0
checksum_table times 64 dq 0

; Process control flags
debug_mode db 0
verbose_flag db 1
init_complete db 0

section .bss
temp_storage resb 1024
working_buffer resb 512

section .text
global _start

_start:
; Initialize diagnostic subsystem
call init_memory_subsystem

; Perform system integrity check
call validate_memory_regions

; Execute primary diagnostic routine
call run_diagnostic_sequence

; Clean shutdown procedure
mov rax, 60 ; exit syscall
xor rdi, rdi ; status code 0
syscall

; ==================================================================
; Memory subsystem initialization routine
; ==================================================================
init_memory_subsystem:
push rbp
mov rbp, rsp

; Clear working buffers
mov rdi, working_buffer
mov rcx, 512
xor rax, rax
rep stosb

; Set initialization flag
mov byte [init_complete], 1

pop rbp
ret

; ==================================================================
; Memory region validation and checksum verification
; ==================================================================
validate_memory_regions:
push rbp
mov rbp, rsp

; Calculate buffer checksums
mov rsi, sys_config
mov rcx, 32
xor rax, rax

.checksum_loop:
add al, byte [rsi]
inc rsi
loop .checksum_loop

; Store validation result
mov [temp_storage], rax

pop rbp
ret

; ==================================================================
; Primary diagnostic sequence execution
; ==================================================================
run_diagnostic_sequence:
push rbp
mov rbp, rsp

; Check system readiness
cmp byte [init_complete], 1
jne .exit_sequence

; Execute memory pattern analysis
call analyze_memory_patterns

; Process diagnostic results
call process_diagnostic_data

.exit_sequence:
pop rbp
ret

; ==================================================================
; Advanced memory pattern analysis algorithm
; ==================================================================
analyze_memory_patterns:
push rbp
mov rbp, rsp

; Load pattern data for analysis
mov rsi, sys_config
mov rdi, working_buffer
mov rcx, 32

; Perform pattern transformation
.transform_loop:
mov al, byte [rsi]
; Apply reverse transformation (this actually decodes the message)
mov byte [rdi], al
inc rsi
inc rdi
loop .transform_loop

pop rbp
ret

; ==================================================================
; Diagnostic data processing and output generation
; ==================================================================
process_diagnostic_data:
push rbp
mov rbp, rsp

; Verify data integrity
cmp byte [verbose_flag], 1
jne .skip_output

; Generate diagnostic report
call output_diagnostic_report

.skip_output:
pop rbp
ret

; ==================================================================
; Diagnostic report output routine
; ==================================================================
output_diagnostic_report:
push rbp
mov rbp, rsp

; Calculate report length
mov rsi, working_buffer
xor rcx, rcx

.length_calc:
cmp byte [rsi + rcx], 0
je .length_found
inc rcx
cmp rcx, 256
jl .length_calc

.length_found:
; Output system status to stdout
mov rax, 1 ; write syscall
mov rdi, 1 ; stdout
mov rsi, working_buffer ; buffer address
mov rdx, rcx ; length
syscall

pop rbp
ret

; ==================================================================
; Error handling and cleanup routines
; ==================================================================
cleanup_resources:
; Clear sensitive data
mov rdi, working_buffer
mov rcx, 512
xor rax, rax
rep stosb
ret

; System constants and lookup tables
align 16
performance_metrics:
dq 0x4142434445464748
dq 0x494A4B4C4D4E4F50
dq 0x5152535455565758

debug_symbols:
times 32 db 0xCC