diff options
Diffstat (limited to 'pxelinux.asm')
| -rw-r--r-- | pxelinux.asm | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/pxelinux.asm b/pxelinux.asm index 85faf63e..1bf8060e 100644 --- a/pxelinux.asm +++ b/pxelinux.asm @@ -37,7 +37,7 @@ max_cmd_len equ 255 ; Must be odd; 255 is the kernel limit FILENAME_MAX_LG2 equ 6 ; log2(Max filename size Including final null) FILENAME_MAX equ (1 << FILENAME_MAX_LG2) REBOOT_TIME equ 5*60 ; If failure, time until full reset -HIGHMEM_MAX equ 038000000h ; Highest address for an initrd +HIGHMEM_MAX equ 037FFFFFFh ; DEFAULT highest address for an initrd HIGHMEM_SLOP equ 128*1024 ; Avoid this much memory near the top DEFAULT_BAUD equ 9600 ; Default baud rate for serial port BAUD_DIVISOR equ 115200 ; Serial port parameter @@ -117,6 +117,7 @@ su_bsklugeseg resw 1 ; 0222 su_heapend resw 1 ; 0224 su_pad1 resw 1 ; 0226 su_cmd_line_ptr resd 1 ; 0228 +su_ramdisk_max resd 1 ; 022C resb (9000h-12)-($-$$) ; Were bootsect.S puts it... linux_stack equ $ ; 8FF4 linux_fdctab equ $ @@ -345,6 +346,7 @@ E820Buf resd 5 ; INT 15:E820 data buffer InitRDat resd 1 ; Load address (linear) for initrd HiLoadAddr resd 1 ; Address pointer for high load loop HighMemSize resd 1 ; End of memory pointer (bytes) +RamdiskMax resd 1 ; Highest address for a ramdisk KernelSize resd 1 ; Size of kernel (bytes) Stack resd 1 ; Pointer to reset stack PXEEntry resd 1 ; !PXE API entry point @@ -1754,6 +1756,7 @@ cmdline_end: ; ; Now check if we have a large kernel, which needs to be loaded high ; + mov dword [RamdiskMax], HIGHMEM_MAX ; Default initrd limit cmp dword [es:su_header],HEADER_ID ; New setup code ID jne near old_kernel ; Old kernel, load low cmp word [es:su_version],0200h ; Setup code version 2.0 @@ -1762,6 +1765,11 @@ cmdline_end: jb new_kernel ; If 2.00, skip this step mov word [es:su_heapend],linux_stack ; Set up the heap or byte [es:su_loadflags],80h ; Let the kernel know we care + cmp word [es:su_version],0203h ; Version 2.03+? + jb new_kernel ; Not 2.03+ + mov eax,[es:su_ramdisk_max] + mov [RamdiskMax],eax ; Set the ramdisk limit + ; ; We definitely have a new-style kernel. Let the kernel know who we are, ; and that we are clueful @@ -1872,11 +1880,13 @@ load_initrd: add ax,dx mov [InitRDClust],ax ; Ramdisk clusters mov edx,[HighMemSize] ; End of memory - mov eax,HIGHMEM_MAX ; Limit imposed by kernel + dec edx + mov eax,[RamdiskMax] ; Highest address allowed by kernel cmp edx,eax jna memsize_ok mov edx,eax ; Adjust to fit inside limit memsize_ok: + inc edx sub edx,[es:su_ramdisklen] ; Subtract size of ramdisk xor dx,dx ; Round down to 64K boundary mov [InitRDat],edx ; Load address |