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Bootloader: Clear screen, better memcpy 

Clear screen before jumping to kernel. Memcpy now uses ebx as offset
register, so only one register has to updated every loop
This commit is contained in:
Bananymous 2023-11-17 20:31:42 +02:00
parent 95af728e39
commit d1444761a3
3 changed files with 18 additions and 11 deletions
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9
bootloader/boot.S
View File

@ -82,15 +82,20 @@ stage2_main:
call elf_read_kernel_to_memory call elf_read_kernel_to_memory
cli # re-enter 80x25 text mode to clear screen
pushw %ax
movb $0x03, %al
movb $0x00, %ah
int $0x10
popw %ax
cli
# setup protected mode # setup protected mode
movl %cr0, %ebx movl %cr0, %ebx
orb $1, %bl orb $1, %bl
movl %ebx, %cr0 movl %ebx, %cr0
# jump to kernel in protected mode # jump to kernel in protected mode
ljmpl $0x18, $protected_mode ljmpl $0x18, $protected_mode

2
bootloader/elf.S
View File

@ -170,7 +170,7 @@ elf_read_kernel_to_memory:
andl $0x7FFFFFFF, %edi andl $0x7FFFFFFF, %edi
movl (elf_program_header + p_filesz), %ecx movl (elf_program_header + p_filesz), %ecx
call print_hex32; call print_newline #call print_hex32; call print_newline
call *%esi call *%esi

18
bootloader/ext2.S
View File

@ -409,13 +409,14 @@ ext2_inode_read_bytes:
addl %edx, %esi addl %edx, %esi
# very dumb memcpy with 32 bit addresses # very dumb memcpy with 32 bit addresses
movl $0, %ebx
.ext2_inode_read_bytes_memcpy_partial: .ext2_inode_read_bytes_memcpy_partial:
movb (%esi), %al movb (%esi, %ebx), %al
movb %al, (%edi) movb %al, (%edi, %ebx)
incl %esi incl %ebx
incl %edi
decl %ecx decl %ecx
jnz .ext2_inode_read_bytes_memcpy_partial jnz .ext2_inode_read_bytes_memcpy_partial
addl %ebx, %edi
# check if all sectors are read # check if all sectors are read
cmpl $0, 4(%esp) cmpl $0, 4(%esp)
@ -441,13 +442,14 @@ ext2_inode_read_bytes:
# very dumb memcpy with 32 bit addresses # very dumb memcpy with 32 bit addresses
movl $ext2_block_buffer, %esi movl $ext2_block_buffer, %esi
movl $0, %ebx
.ext2_inode_read_bytes_memcpy: .ext2_inode_read_bytes_memcpy:
movb (%esi), %al movb (%esi, %ebx), %al
movb %al, (%edi) movb %al, (%edi, %ebx)
incl %esi incl %ebx
incl %edi
decl %ecx decl %ecx
jnz .ext2_inode_read_bytes_memcpy jnz .ext2_inode_read_bytes_memcpy
addl %ebx, %edi
# read next block if more sectors remaining # read next block if more sectors remaining
cmpl $0, 4(%esp) cmpl $0, 4(%esp)