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34 the real operating system is loaded into memory and we are ready to hand
49 should contain the needed flags for the operating system we have loaded. The
50 psw's instruction address will point to the location in memory where we want
68 In theory we should merely have to do the following to IPL/boot a guest
79 When we start a channel program we pass the channel subsystem parameters via an
95 it from the disk. So we need to be able to handle this case.
100 Since we are forced to live with prefetch we cannot use the very simple IPL
101 procedure we defined in the preceding section. So we compensate by doing the
112 to read the very next record which will be IPL2. But since we are not reading
113 both IPL1 and IPL2 as part of the same channel program we must manually set
119 Now IPL2 is loaded into memory somewhere, and we know the address.
123 Because this channel program can be dynamic, we must use a special algorithm
126 the kernel/hardware to the QEMU bios code we immediately issue another start
138 LPSW transfers control to the guest operating system and we're done.