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Diffstat (limited to 'comboot.doc')
| -rw-r--r-- | comboot.doc | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/comboot.doc b/comboot.doc index 2f5f247c..f427246f 100644 --- a/comboot.doc +++ b/comboot.doc @@ -292,6 +292,10 @@ AX=0007h Read file aligned. SYSLINUX guarantees at least this alignment for the COMBOOT load segment or the COM32 bounce buffer. + Keep in mind that a "file" may be a TFTP connection, and that + leaving a file open for an extended period of time may result + in a timeout. + WARNING: Calling this function with an invalid file handle will probably crash the system. @@ -377,3 +381,34 @@ AX=000Bh Get Serial Console Configuration If no serial port is configured, DX will be set to 0 and the other registers are undefined. + + +AX=000Ch Perform final cleanup + Input: AX 000Ch + DX derivative-specific flags (0000h = clean up all) + Output: None + + This routine performs any "final cleanup" the boot loader + would normally perform before loading a kernel, such as + unloading the PXE stack in the case of PXELINUX. AFTER + INVOKING THIS CALL, NO OTHER API CALLS MAY BE INVOKED, NOR MAY + THE PROGRAM TERMINATE AND RETURN TO THE BOOT LOADER. This + call basically tells the boot loader "get out of the way, I'll + handle it from here." The boot loader will continue to + provide interrupt and BIOS call thunking services as long its + memory areas (0x1000-0xffff, 0x100000-0x100fff) are not + overwritten. MAKE SURE TO DISABLE INTERRUPTS BEFORE + OVERWRITING THESE MEMORY AREAS. + + The permissible values for DX are as follows: + + SYSLINUX: 0000h Normal cleanup + + PXELINUX: 0000h Normal cleanup + 0003h Keep UNDI and PXE stacks loaded + + ISOLINUX: 0000h Normal cleanup + + All other values are undefined, and may have different + meanings in future versions of SYSLINUX. + |