diff options
Diffstat (limited to 'core/pxelinux.asm')
| -rw-r--r-- | core/pxelinux.asm | 30 |
1 files changed, 19 insertions, 11 deletions
diff --git a/core/pxelinux.asm b/core/pxelinux.asm index 8884e030..c04da8ee 100644 --- a/core/pxelinux.asm +++ b/core/pxelinux.asm @@ -106,12 +106,8 @@ packet_buf resb 2048 ; Transfer packet packet_buf_size equ $-packet_buf section .text16 - ; - ; PXELINUX needs more BSS than the other derivatives; - ; therefore we relocate it from 7C00h on startup. - ; -StackBuf equ $-44 ; Base of stack if we use our own -StackTop equ StackBuf +StackBuf equ STACK_TOP-44 ; Base of stack if we use our own +StackHome equ StackBuf ; PXE loads the whole file, but assume it can't be more ; than (384-31)K in size. @@ -153,6 +149,21 @@ _start1: mov ds,ax mov es,ax +%if 0 ; debugging code only... not intended for production use + ; Clobber the stack segment, to test for specific pathologies + mov di,STACK_BASE + mov cx,STACK_LEN >> 1 + mov ax,0xf4f4 + rep stosw + + ; Clobber the tail of the 64K segment, too + extern __bss1_end + mov di,__bss1_end + sub cx,di ; CX = 0 previously + shr cx,1 + rep stosw +%endif + ; That is all pushed onto the PXE stack. Save the pointer ; to it and switch to an internal stack. mov [InitStack],sp @@ -536,15 +547,12 @@ exten_table_end: ; Misc initialized (data) variables ; section .data16 - - alignz 4 - global BaseStack, KeepPXE -BaseStack dd StackTop ; ESP of base stack - dw 0 ; SS of base stack + global KeepPXE KeepPXE db 0 ; Should PXE be kept around? ; ; IP information (initialized to "unknown" values) + alignz 4 global MyIP MyIP dd 0 ; My IP address ; |