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Adjusted the start_64 kernel identifier message

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max 🍓
2022-12-14 18:40:06 +00:00
parent f9c835b9d6
commit a5c6240761
1 changed files with 16 additions and 4 deletions
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20
arch/x86_64/start_64.S
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@@ -6,15 +6,26 @@
ERROR MESSAGE STRINGS ERROR MESSAGE STRINGS
*******/ *******/
kernel_identifier: kernel_identifier:
.asciz " Socks kernel version " BUILD_ID " " .asciz " Socks kernel version " BUILD_ID " "
.section .boot.text, "ax", @progbits .section .boot.text, "ax", @progbits
vga_clear:
mov $0xb8000, %edi # VGA buffer
mov $0xFA0, %ecx # 4,000 bytes to clear
mov $0x0, %eax
rep stosb
ret
# prints a block message showing the kernel name and version number
# starting at cell 2x1 on the VGA display
print_kernel_identifier: print_kernel_identifier:
/* line 1: empty padding line */ /* line 1: empty padding line */
mov $kernel_identifier, %rsi mov $kernel_identifier, %rsi
mov $0xb8000, %rdi mov $0xb80a4, %rdi
1: 1:
movw $0x7000, (%rdi) # black text on white background. movw $0x7000, (%rdi) # black text on white background.
@@ -25,7 +36,7 @@ print_kernel_identifier:
/* line 2: kernel identiifer */ /* line 2: kernel identiifer */
mov $kernel_identifier, %rsi mov $kernel_identifier, %rsi
mov $0xb80A0, %rdi mov $0xb8144, %rdi
2: 2:
movsb movsb
@@ -37,7 +48,7 @@ print_kernel_identifier:
/* line 3: empty padding line */ /* line 3: empty padding line */
mov $kernel_identifier, %rsi mov $kernel_identifier, %rsi
mov $0xb8140, %rdi mov $0xb81e4, %rdi
1: 1:
movw $0x7000, (%rdi) # black text on white background. movw $0x7000, (%rdi) # black text on white background.
@@ -51,6 +62,7 @@ print_kernel_identifier:
.global start_64 .global start_64
.type start_64, @function .type start_64, @function
start_64: start_64:
call vga_clear
call print_kernel_identifier call print_kernel_identifier
cli cli