Disable interrupts when calling into SAL for PCI configuration cycles. This serves 2 purposes: 1.  It prevents preemption and CPU migration while running SAL code. 2.  It reduces the chance of stack overflows: we're supposed to enter     SAL with at least 16KB of either memory- or register stack space,     which we can't do without switching to a different stack.
Disable interrupts when calling into SAL for PCI configuration
cycles. This serves 2 purposes:
1.  It prevents preemption and CPU migration while running SAL code.
2.  It reduces the chance of stack overflows: we're supposed to enter
    SAL with at least 16KB of either memory- or register stack space,
    which we can't do without switching to a different stack.

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