diff options
| author | H. Peter Anvin <hpa@zytor.com> | 2008-02-27 13:22:16 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-02-27 13:24:57 -0800 |
| commit | f4c12ad254d31eae619f38f7571e57e110745d66 (patch) | |
| tree | a87fc262b7899c73ba240a5c4ad5558b04ba7f44 /ldlinux.asm | |
| parent | 79c071f6ca6dc9bd5eafb33da8587b7873b5e270 (diff) | |
| download | syslinux-3.70-pre1.tar.gz | |
SYSLINUX, EXTLINUX: support the new getfssec APIsyslinux-3.70-pre1
Support the new getfssec API which returns number of bytes read in
SYSLINUX and EXTLINUX. Untested so far, but it's a reasonably easy
change.
Diffstat (limited to 'ldlinux.asm')
| -rw-r--r-- | ldlinux.asm | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/ldlinux.asm b/ldlinux.asm index c8e4aa81..4df94b73 100644 --- a/ldlinux.asm +++ b/ldlinux.asm @@ -88,7 +88,9 @@ comboot_seg equ real_mode_seg ; COMBOOT image loading zone ; struc open_file_t file_sector resd 1 ; Sector pointer (0 = structure free) +file_bytesleft resd 1 ; Number of bytes left file_left resd 1 ; Number of sectors left + resd 1 ; Unused endstruc %ifndef DEPEND @@ -1089,6 +1091,7 @@ searchdir: jnz .badfile ; If not a file, it's a bad thing ; SI and EAX are already set + mov [si+file_bytesleft],eax and eax,eax ; EAX != 0 jz .badfile ret ; Done! @@ -1341,20 +1344,30 @@ getfssec_edx: ; CX -> Sector count (0FFFFh = until end of file) ; Must not exceed the ES segment ; Returns CF=1 on EOF (not necessarily error) +; ECX returns number of bytes read. ; All arguments are advanced to reflect data read. ; getfssec: push edx movzx edx,cx - cmp edx,[si+4] + push edx ; Zero-extended CX + cmp edx,[si+file_left] jbe .sizeok - mov edx,[si+4] + mov edx,[si+file_left] mov cx,dx .sizeok: - sub [si+4],edx - mov edx,[si] + sub [si+file_left],edx + mov edx,[si+file_sector] call getfssec_edx - mov [si],edx + mov [si+file_sector],edx + pop ecx ; Sectors requested read + pushf ; Save CF from getfssec_edx + shl ecx,SECTOR_SHIFT + cmp ecx,[si+file_bytesleft] + jna .noteof + mov ecx,[si+file_bytesleft] +.noteof: sub ecx,[si+file_bytesleft] + popf pop edx ret |