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Bootloader: Implement better memset and memcpy for 32 bit addresses

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Bananymous
2024-04-20 17:57:16 +03:00
parent 0e405755ad
commit 9ac3f48fcb
6 changed files with 138 additions and 43 deletions
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20
bootloader/bios/ext2.S
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@@ -454,15 +454,7 @@ ext2_inode_read_bytes:
movl $ext2_block_buffer, %esi
addl %edx, %esi
# very dumb memcpy with 32 bit addresses
xorl %ebx, %ebx
.ext2_inode_read_bytes_memcpy_partial:
movb (%esi, %ebx), %al
movb %al, (%edi, %ebx)
incl %ebx
decl %ecx
jnz .ext2_inode_read_bytes_memcpy_partial
addl %ebx, %edi
call memcpy32
# check if all sectors are read
cmpl $0, 4(%esp)
@@ -487,16 +479,8 @@ ext2_inode_read_bytes:
addl %ecx, 0(%esp)
subl %ecx, 4(%esp)
# very dumb memcpy with 32 bit addresses
movl $ext2_block_buffer, %esi
movl $0, %ebx
.ext2_inode_read_bytes_memcpy:
movb (%esi, %ebx), %al
movb %al, (%edi, %ebx)
incl %ebx
decl %ecx
jnz .ext2_inode_read_bytes_memcpy
addl %ebx, %edi
call memcpy32
# read next block if more sectors remaining
cmpl $0, 4(%esp)