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Background: I recently wrote to Peter Anvin regarding IPAPPEND functionality, and he suggested I take the issue to this mailing list. I see it has been touched upon several times, after reviewing the archives. Let me see if I can add to it with a good level of detail: When using PXE to network boot a linux client, PXE must first acquire the client's IP address, by dhcp request, then, the

...op ebx pop ax @@ -166,7 +169,7 @@ DoneWeird: and ah,ah lds ebx,[Stack] - ; This sets the low byte (the arithmetric flags) of the + ; This sets the low byte (the arithmetic flags) of the ; FLAGS on stack to either 00h (no flags) or 01h (CF) ; depending on if AH was zero or not. setnz [bx+4] ; Set CF iff error @@ -181,7 +184,8 @@ Reset: TRACER 'R' xor ax,ax ; Bottom of memory mov es,ax - test dl,dl ; Always pass it on if we are resetting HD + test dl,dl ; Always pass it on if we are + ; resetting HD js .hard_disk ; Bit 7 set ; Some BIOSes get ve...

...@@ -191,10 +191,10 @@ CFLT4: mov UREGS_ss+8(%rsp),%fs movb TRAPBOUNCE_flags(%rdx),%cl subl $3*4,%esi movq VCPU_vcpu_info(%rbx),%rax - pushq VCPUINFO_upcall_mask(%rax) + pushq COMPAT_VCPUINFO_upcall_mask(%rax) testb $TBF_INTERRUPT,%cl setnz %ch # TBF_INTERRUPT -> set upcall mask - orb %ch,VCPUINFO_upcall_mask(%rax) + orb %ch,COMPAT_VCPUINFO_upcall_mask(%rax) popq %rax shll $16,%eax # Bits 16-23: saved_upcall_mask movw UREGS_cs+8(%rsp),%ax #...